JP2020091040A - Dust removing method and dust removing device for boiler radiation transfer face in stoker type incinerator including boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the amount of power generation due to deterioration of heat transfer performance of a radiant heat transfer surface of a boiler, to extend the life of a boiler by suppressing corrosion of a superheater and to reduce maintenance costs, and to reduce maintenance costs by reducing the scale and frequency of in-furnace cleaning. To reduce damage and prevent damage to the inside of the furnace due to falling dust.
SOLUTION: This is a dust removal method 1 for a radiant heat transfer surface of a boiler in a waste treatment furnace 3 equipped with a boiler 2, wherein an inner position is an outer position of a water pipe wall 18 which is a radiant heat transfer surface of the boiler 2. A plurality of striking devices 20 disposed on the water pipe 18 apply a striking force to the water pipe wall 18 to vibrate the water pipe wall 18 itself to remove dust adhering to the inner surface of the water pipe wall 18 forming the boiler radiant heat transfer surface. To do.
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Description

The present invention is a waste treatment furnace equipped with a boiler for treating waste such as municipal solid waste and industrial waste (for example, a stoker incinerator, a circulating fluidized bed boiler, a fluidized bed incinerator, a combustion type melting furnace, etc.). The present invention relates to a dust removing method and a dust removing device for a boiler radiant heat transfer surface.

In a waste treatment furnace equipped with a boiler that treats waste such as municipal waste, for example, in a stoker type incinerator equipped with a boiler (waste heat boiler), the boiler radiant heat transfer surface (stoker type) Dust adheres to the inner surface of the secondary combustion chamber of the incinerator and the inner surface of the radiant heat transfer chamber from the outlet of the secondary combustion chamber to the superheater of the boiler.

If dust adheres to the radiant heat transfer surface of the boiler, the heat transfer performance of the boiler is reduced, and the temperature and amount of boiler steam are reduced, which reduces the power generation amount of the turbine generator.

Further, when the heat transfer performance on the upstream side (secondary combustion chamber side) of the boiler decreases, the temperature on the downstream side (superheater side) of the boiler rises.

The dust in the stoker type incinerator is easily melted and adhered when the temperature of the combustion exhaust gas is about 650°C to 700°C. Therefore, the superheater of the boiler is generally arranged at a position below the temperature range of the combustion exhaust gas passage in order to avoid corrosion and blockage of the heat transfer tube of the superheater due to adhesion of dust.

However, due to the dust adhering to the boiler radiant heat transfer surface, the temperature on the downstream side of the boiler rises, and the flue gas temperature on the inlet side of the superheater may reach the above temperature range.

Further, the dust attached to the heat transfer surface of the boiler grows and falls into the furnace due to its own weight, which may damage the inside of the furnace.

Further, the radiant heat transfer surface of the boiler is difficult to clean while the stoker incinerator is in operation, and dust adhesion is inevitable with the lapse of operation time.

Therefore, in a waste treatment furnace equipped with a boiler such as a stoker incinerator, dust adhering to the radiant heat transfer surface of the boiler is removed in order to avoid the problems described above.

Conventionally, as a dust removing method and a dust removing apparatus for a boiler radiant heat transfer surface of a waste treatment furnace equipped with a boiler, there are, for example, the following means (1) to (3).

(1) When the waste treatment furnace is shut down, workers intrude into the furnace and use air blast to remove dust adhering to the heat radiation surface of the boiler.
(2) During operation of the waste treatment furnace, water is sprayed from the water injection device into the furnace to remove dust attached to the radiant heat transfer surface of the boiler (see Patent Document 1). At this time, the water sprayed on the radiant heat transfer surface of the boiler comes into contact with the dust and rapidly evaporates inside the dust to expand and rupture the dust, thereby removing the dust.
(3) During operation of the waste treatment furnace, a pressure wave is emitted from the pressure wave generator into the furnace to remove dust adhering to the boiler radiant heat transfer surface (see Patent Documents 1 to 3).

However, since the labor cost for removing dust by cleaning workers is high and the practicable period for cleaning is limited to the period when the furnace is shut down, if the waste treatment furnace is operated for a long period of time, the gas temperature in the latter stage of the boiler will be reduced. The rise is inevitable, and there is the problem that dust will melt and stick to the heat transfer tubes of the superheater.

Further, the removal of dust by the water injection device may cause damage to the boiler radiant heat transfer surface due to drain attack.

Further, in the dust removal by the pressure wave generator, if the distance between the pressure wave generator and the radiant heat transfer surface of the boiler is too short, the water pipe may be damaged by the pressure wave. Moreover, there is a problem that the high pressure gas needs to be handled with care and the maintenance cost becomes high.

JP, 2017-181008, A JP, 2017-181007, A Japanese Patent Publication No. 2017-187267

The present invention has been made in view of the above problems, and an object thereof is to solve the problems of cleaning the inside of a furnace by workers, the problems of a water injection device and the pressure wave generator, and to solve the problems of boiler radiation transmission. Suppressing the amount of power generation due to deterioration of heat transfer performance on the hot side, extending the life of the boiler by suppressing corrosion of the superheater and reducing maintenance costs, reducing maintenance costs by reducing the scale and frequency of in-furnace cleaning, and reducing the amount of grown dust It is an object of the present invention to provide a dust removing method and a dust removing apparatus for a boiler radiant heat transfer surface in a waste treatment furnace including a boiler capable of preventing damage to the inside of the furnace due to dropping.

In order to achieve the above object, the invention according to claim 1 of the present invention is a method for removing dust from a boiler radiant heat transfer surface in a waste treatment furnace equipped with a boiler, wherein the inner surface is a boiler radiant heat transfer surface. The inner surface of the water pipe wall that forms a radiant heat transfer surface of the boiler by applying a striking force to the water pipe wall by a plurality of striking devices arranged outside the water pipe wall to vibrate the water pipe wall itself. The feature is that the dust adhering to is removed.

According to a second aspect of the present invention, in the invention according to the first aspect, the waste treatment furnace equipped with a boiler is a stoker-type incinerator, and at least the radiation heat transfer chamber and the convective heat transfer chamber of the stoker-type incinerator are used. A plurality of striking devices disposed outside the water tube walls forming the heat chambers are applied to each water tube wall to vibrate the water tube wall itself, thereby forming a boiler radiation heat transfer surface. The feature is that the dust attached to the inner surface of the water pipe wall is removed.

According to a third aspect of the present invention, in the invention according to the first or second aspect, the striking force of each striking device is dispersed between the outer surface of the water pipe wall and each striking device. It is characterized in that the striking force dispersion means is provided, and the striking force of each striking device is dispersed by the striking force distribution means and transmitted to the water pipe wall.

The invention according to claim 4 of the present invention is characterized in that, in the invention according to any one of claims 1, 2 and 3, the driving frequency of the striking device is controlled by a timer. is there.

According to a fifth aspect of the present invention, in the invention according to any one of the first aspect, the second aspect, and the third aspect, the striking device controls the inlet side temperature of the boiler superheater by a temperature detector. It is characterized in that it detects the temperature and activates it when the temperature on the inlet side of the superheater exceeds a predetermined temperature.

The invention according to claim 6 of the present invention is a dust removing device for a boiler radiant heat transfer surface in a waste treatment furnace equipped with a boiler, wherein a water pipe wall whose inner surface is the boiler radiant heat transfer surface. A plurality of striking devices disposed at the outer position, and a striking force distribution means that is respectively interposed between the water pipe wall and each striking device and that disperses the striking force of each striking device and transmits it to the water pipe wall. It is characterized by having it.

The invention according to claim 7 of the present invention is characterized in that, in the invention according to claim 6, the striking device is at least one of an air knocker, an electromagnetic knocker, and a hammering device.

According to an eighth aspect of the present invention, in the invention according to the sixth aspect, the striking force dispersing means includes the plurality of water pipes and the plurality of water pipe walls including fins that connect adjacent water pipes. A plurality of water pipe protection protectors, which are arranged in contact with the outer surface of the water pipe of the book, and whose both ends are fixed to the outer surface of the fin of the water pipe wall, are fixed to the respective water pipe protection protectors, and It is characterized in that it is provided with a striking seat for receiving a striking force and transmitting it to each water pipe protecting protector.

According to a ninth aspect of the present invention, in the invention according to the sixth aspect, the striking force distribution means includes the plurality of water pipes and the plurality of water pipe walls including fins that connect adjacent water pipes. One water pipe protector, which is placed in contact with the outer surface of the water pipe of the book and has both ends fixed to the outer surface of the fin of the water pipe wall, and the water pipe protection protector. It is characterized in that it is provided with a striking seat for receiving and transmitting it to one protector for protecting the water pipe.

An invention according to claim 10 of the present invention is characterized in that, in the invention according to any one of claims 6, 7, 8 and 9, a soundproofing means is provided around the hitting device. There is.

The invention according to claim 11 of the present invention is the invention according to any one of claim 6, claim 7, claim 8, claim 9 or claim 10, wherein the dust removing device is provided for each striking device. It is characterized by having a timer that controls the driving frequency.

According to a twelfth aspect of the present invention, in the invention according to any one of the sixth, seventh, eighth, ninth and tenth aspects, the dust removing device is a boiler superheater. It is characterized in that it is provided with a temperature detector for detecting the inlet side temperature of the above, and each striking device is activated when the inlet side temperature of the superheater exceeds a predetermined temperature.

Dust removal method according to the present invention, the inner surface is a radiant heat transfer surface of the boiler pipe, the impact force is applied to the water pipe wall by a plurality of striking devices arranged outside the water pipe wall to remove the water pipe wall itself. Since it is made to vibrate, it is possible to reliably and satisfactorily remove dust adhering to the boiler radiant heat transfer surface, and as a result, prevent a decrease in the amount of power generation due to a decrease in the heat transfer performance of the boiler radiant heat transfer surface. It is possible to prolong the life of the boiler by suppressing corrosion of the superheater and reduce maintenance costs, reduce maintenance costs by reducing the scale and frequency of cleaning inside the furnace, and prevent damage to the inside of the furnace due to falling dust that has grown.

Further, the dust removal method according to the present invention, between the outer surface of the water pipe wall and each striking device, a striking force distribution means for dispersing the striking force of each striking device is provided, and the striking force of each striking device is The striking force is dispersed by the striking force distribution means and transmitted to the water pipe wall, so that the striking force of the striking device can be transmitted to the water pipe wall over a wide range, and dust attached to the boiler radiant heat transfer surface can be removed. It can be removed more reliably and satisfactorily.

Further, in the dust removing method according to the present invention, by controlling the operating frequency of each striking device by the timer, the dust adhering to the boiler radiant heat transfer surface can be removed more reliably and satisfactorily.

Further, in the dust removing method according to the present invention, the temperature on the inlet side of the superheater of the boiler is detected by the temperature detector, and each striking device is activated when the temperature on the inlet side of the superheater exceeds a predetermined temperature. Therefore, the corrosion of the superheater can be further suppressed.

The dust removing device according to the present invention includes a plurality of striking devices disposed on the outer side of the water pipe wall whose inner surface serves as a boiler radiant heat transfer surface, and a striking device interposed between the water pipe wall and each striking device. Since it is provided with a striking force distribution means for dispersing the striking force of each striking device and transmitting the striking force to the water pipe wall, the striking force of the striking device can be transmitted to the water pipe wall in a wide range. Dust adhering to the radiant heat transfer surface can be reliably and satisfactorily removed.

Further, in the dust removing device according to the present invention, the striking force dispersing means is a striker fixed to the water pipe protecting protector that is in contact with a plurality of water pipes on the water pipe wall, and is hit by the striking force of the striking device. Since the seat is provided, the striking force of the striking device is not directly transmitted to the water pipe wall, and damage or destruction of the water pipe wall due to the striking force of the striking device can be prevented.

Further, the dust removing device according to the present invention can suppress the noise pollution by the hitting device by providing the soundproofing means around each hitting device.

Further, the dust removing device according to the present invention is provided with the timer for controlling the operation frequency of each striking device, so that the dust adhering to the boiler radiation heat transfer surface can be removed more reliably and satisfactorily.

Further, the dust removing device according to the present invention includes a temperature detector that detects the inlet side temperature of the superheater of the boiler, and activates each striking device when the inlet side temperature of the superheater exceeds a predetermined temperature. Therefore, the corrosion of the superheater can be further suppressed.

1 is a schematic vertical cross-sectional view of a waste treatment furnace (stoker type incinerator) including a boiler in which a dust removing device according to an embodiment of the present invention is installed. It is a front view of the dust removing device concerning the embodiment of the present invention. FIG. 3 is a vertical sectional view of the dust removing device shown in FIG. 2. It is a cross-sectional view of the dust removing device shown in FIG. The state where the protector for water pipe protection is attached to the water pipe wall is shown, (A) is a cross-sectional view of the state where the protector for water pipe protection is attached to the water pipe in a line contact state, (B) is the surface contact state for the protector for water pipe It is a cross-sectional view of the state of being attached to the water pipe. The modification of a dust removal device is shown, (A) is a front view of a dust removal device, (B) is a longitudinal cross-sectional view of a dust removal device, and (C) is a cross-sectional view of a removal device. The modification of a dust removal device is shown, (A) is a front view of a dust removal device, and (B) is a longitudinal section of a dust removal device.

An embodiment of the present invention will be described below in detail with reference to the drawings.
FIG. 1 shows a waste treatment furnace including a boiler 2 in which a dust removing device 1 according to an embodiment of the present invention is installed.

In this embodiment, a stoker incinerator 3 equipped with a boiler 2 (waste heat boiler) is used as a waste treatment furnace equipped with the boiler 2, and the stoker incinerator 3 is used for municipal waste and industrial waste. This is for incinerating waste such as waste on a stoker, and is provided with a dust removing device 1 for removing dust D adhering to the radiation heat transfer surface of the boiler 2 (waste heat boiler).

That is, the stoker-type incinerator 3 equipped with the boiler 2 (waste heat boiler) includes a furnace body 4, a waste input hopper 5, a waste supply pusher 6, a drying stoker 7, a combustion stoker 8, a post-combustion stoker 9, and a stoker bottom. It is provided with a hopper 10, a primary combustion chamber 11, a secondary combustion chamber 12 and the like, and has the same structure as a conventionally known one.

Further, as shown in FIG. 1, the boiler 2 (waste heat boiler) attached to the stoker incinerator 3 recovers heat from the high temperature combustion exhaust gas G generated in the furnace body 4 to heat and evaporate the boiler feed water, The generated steam is further superheated into superheated steam, and this superheated steam is supplied to a turbine generator (not shown), and steam is generated by receiving radiant heat from the drum 13 and the combustion exhaust gas G. A first radiant heat transfer chamber 14 having a radiant heat transfer surface in a space above the secondary combustion chamber 12 and a radiant heat transfer surface for receiving steam from the combustion exhaust gas G passing through the secondary combustion chamber 12 to generate steam; A second radiation heat transfer chamber 15, a convection heat transfer chamber 17 having a superheater 16 for further heating steam by heat exchange between the combustion exhaust gas G and the convection heat transfer surface of the heat transfer tube, and the like are provided.

Further, the space above the secondary combustion chamber 12, the first radiation heat transfer chamber 14, the second radiation heat transfer chamber 15, and the convection heat transfer chamber 17 are each formed by a water pipe wall 18, and the water pipe wall 18 is formed. Is provided with a plurality of water pipes 18a (bare thick pipes) arranged in parallel, and strip-shaped fins 18b that connect adjacent water pipes 18a in an airtight manner. The inner surface of the water pipe wall 18 serves as a boiler radiation heat transfer surface. A heat insulating material 19 is provided on the outer surface of the water pipe wall 18.

And the dust removal apparatus 1 which concerns on embodiment of this invention is a boiler radiant heat transfer surface (The inner surface of the water pipe wall 18 which forms the space above the secondary combustion chamber 12, the 1st radiant heat transfer chamber 14 and the 2nd. The dust D adhering to the inner surface of the water pipe wall 18 forming the radiant heat transfer chamber 15 and the inner surface of the water pipe wall 18 forming the convection heat transfer chamber 17 is removed to reduce the heat transfer performance of the boiler 2. As shown in FIG. 1, the water pipe wall 18 that forms the boiler radiant heat transfer surface (the water pipe wall 18 that forms the upper space of the secondary combustion chamber 12, the first radiant heat transfer chamber 14, and the 2 A plurality of striking devices 20 arranged outside the water pipe wall 18 forming the radiant heat transfer chamber 15 and the water pipe wall 18 forming the convection heat transfer chamber 17, and the water pipe wall 18 and each striking device 20. Between the impacting device 20 and the impacting force dispersing means 21 for dispersing the impacting force of each impacting device 20 and transmitting it to the water pipe wall 18, the control device 22 for controlling the operation of each impacting device 20, and the boiler 2. A temperature detector 26 for detecting the inlet side temperature of the superheater 16 is provided.

Each striking device 20 is composed of an air knocker, an electromagnetic knocker, or a hammering device. In this embodiment, each striking device 20 uses an air knocker that uses aerodynamic force as an impact force source (for example, Japanese Patent Laid-Open No. 2012-111542). The impact device described in 1) is used.

The air knocker forming the striking device 20 is, as shown in FIGS. 2 to 4, a casing 20a having a cylinder chamber (not shown) and a pressure accumulating chamber (not shown), and is slidably inserted into the cylinder chamber. A piston (not shown) that moves by the pressure of the air discharged from the object to impact the hit object, a compression coil spring (not shown) that urges the piston in a direction away from the hit object, and a casing 20a. It is equipped with a mounting base 20b that is connected to and receives the impact of the piston, and the accumulator of the casing 20 is connected to a compressed air supply source (not shown) such as a compressor and is provided with an air supply such as a three-way valve 23. A tube 24 is connected.

Thus, according to the air knocker, when compressed air is supplied from the compressed air supply source to the pressure accumulating chamber in the casing 20a via the air supply pipe 24 and the three-way valve 23, the piston resists the urging force of the compression coil spring. When the mounting base 20b is hit at high speed and the three-way valve 23 is switched to the exhaust side, the pressure in the pressure accumulating chamber in the casing 20a decreases, and the elastic force of the compression coil spring causes the piston to move to its original position. Return to. By repeating this operation, a striking force is generated.

The air knocker can adjust the striking force by changing the pressure of the compressed air supplied. That is, the striking force can be increased by increasing the pressure of the compressed air supplied to the air knocker, and conversely, the striking force can be reduced by decreasing the pressure of the compressed air supplied to the air knocker. In the operation of the actual machine, the pressure of the compressed air is set to 0.3 MPa to 0.5 MPa, and the pressure of the compressed air is adjusted according to the operating frequency of the air knocker. Further, the pressure control of the compressed air is not performed during the operation of the stoker incinerator 3.

In the present embodiment, as shown in FIG. 1, the striking device 20 includes a sidewall outer surface that forms an upper space of the secondary combustion chamber 12, a ceiling wall outer surface that forms an upper space of the secondary combustion chamber 12, and a first outer wall surface. The outer surface of the ceiling wall of the radiant heat transfer chamber 14, the outer surface of the first radiant heat transfer chamber and the side wall of the second radiant heat transfer chamber 15, the outer surface of the bottom wall of the second radiant heat transfer chamber 15, and the side wall of the convective heat transfer chamber 17. A plurality is arranged on each of the outer side surfaces.

In addition, the number of striking devices 20 attached to the stoker incinerator 3, the interval between the striking devices 20, and the striking force of the striking device 20 are determined by the inner surface of the water pipe wall 18 (secondary combustion chamber) that forms the radiant heat transfer surface of the boiler. Water forming the convection heat transfer chamber 17 and the inner surface of the water pipe wall 18 forming the upper space of 12, the inner surface of the water pipe wall 18 forming the first radiant heat transfer chamber 14 and the second radiant heat transfer chamber 15. It is set so that the dust D adhering to the inner surface of the pipe wall 18 can be reliably and satisfactorily removed.

Further, each striking device 20 detects the inlet side temperature of the superheater 16 by the temperature detector 26 provided on the inlet side of the superheater 16 of the boiler 2, and the inlet side temperature of the superheater 16 is a predetermined temperature (for example, When the temperature exceeds 650° C., the control device 22 is set to operate.

In the above embodiment, each striking device 20 is operated by the control device 22 based on the temperature detected by the temperature detector 26, but in another embodiment, each striking device 20 is controlled by the control device. The operation may be controlled to start at the same time when the stoker incinerator 3 is started up immediately after cleaning the inside of the stoker incinerator 3, or the operation frequency of the striking device 20 is controlled by the timer 25 provided in the control device 22. It may be done. The operating frequency of the striking device 20 is set so that a large amount of dust D will not be attached to the heat radiation surface of the boiler and the heat transfer performance of the boiler 2 will not be significantly reduced.

As shown in FIGS. 2 to 4, the striking force dispersing means 21 is arranged on the outer surface of the water pipe wall 18 and in contact with the outer surfaces of the plurality of water pipes 18a, and both end portions thereof are arranged. A plurality of water pipe protecting protectors 21a fixed to the outer surface of the fin 18b, and a striking seat 21b fixed to each water pipe protecting protector 21a and receiving the striking force of the striking device 20 and transmitting to the respective water pipe protecting protectors 21a. The impact force of the impact device 20 is dispersed and transmitted to the water pipe wall 18. By providing the striking force distribution means 21, the striking force of the striking device 20 can be transmitted to the water pipe wall 18 in a wide range.

Specifically, as shown in FIGS. 2 to 5, each of the water pipe protectors 21a has a semi-circular trough that is in contact with the outer surface of the water pipe 18a in a line contact state or a surface contact state with a metal plate such as a steel plate. Both ends along the longitudinal direction are fixed to the outer surface of the fin 18b of the water pipe wall 18 by welding a. Since this water pipe protecting protector 21a is attached to the fin 18b of the water pipe wall 18 by welding a, the water pipe 18a can be reliably protected without damaging or damaging the water pipe 18a.

In the present embodiment, five protectors 21a for protecting water tubes are used, and the protectors 21a are in line contact or in surface contact with the outer surfaces of the five adjacent water tubes 18a of the water tube wall 18 and along the longitudinal direction. Both ends are fixed to the outer surface of the fin 18b of the water pipe wall 18 by welding a. The length of each water pipe protection protector 21a is set to 600 mm.

As shown in FIGS. 2 to 4, the striking seat 21b is formed of a metal plate such as a steel plate into a box shape having an open surface facing the outer surface of the water pipe wall 18, and the box striking seat 21b. The open ends of are fixed to the outer surface of each of the five water pipe protection protectors 21a by welding a. The striking seat 21b disperses the striking force of the striking device 20 and transmits the striking force to the water pipes 18a of the water pipe wall 18, and the mounting base 20b of the striking device 20 is provided at the middle position on the outer side of the striking seat 21b. It is fixed by welding a.

In the present embodiment, the opening-side width W of the striking seat 21b is set to 370 mm, and the opening-side length L of the striking seat 21b is set to 500 mm (see FIG. 2). The height H of the tapping seat 21b is set so that the distance from the center position in the thickness direction of the fin 18b of the water tube wall 18 to the outer surface of the tapping seat 21b is 125 mm (see FIG. 3).

In addition, around each of the striking devices 20, there is provided a soundproofing means 27 for reducing noise when the striking device 20 operates. As shown in FIG. 3, the soundproofing means 27 forms a housing space S of the striking device 20 by recessing a part of a steel plate casing 30 that covers the outside of the water pipe wall 18, and an inner surface of the housing space S. The plate-shaped sound absorbing material 27a is attached to the. As the material of the plate-shaped sound absorbing material 27a, for example, glass wool, rock wool, soft urethane foam or the like is used.

Further, as shown in FIG. 3, each striking device 20 is connected via a wire 29 to a supporting member 28 fixed to the striking seat 21b by welding a, and should the striking device 20 fall off from the striking seat 21b. Is designed not to fall downward.

Thus, in the stoker type incinerator 3 provided with the dust removing device 1 described above, each striking device 20 of the dust removing device 1 operates at the optimum operating pressure and operating interval, and the striking force dispersing means 21 is used. By hitting the water pipe wall 18 forming the radiant heat transfer surface of the boiler, the dust D attached to the inner surface of the water pipe wall 18 forming the radiant heat transfer surface of the boiler is removed.

Therefore, in the stoker type incinerator 3 provided with the dust removing device 1, the dust D adhering to the boiler radiant heat transfer surface (inner side surface of the water tube wall 18) can be reliably and satisfactorily removed, and the boiler 2 Preventing reduction of power generation due to deterioration of heat transfer performance of radiant heat transfer surface, prolonging life of boiler 2 by suppressing corrosion of superheater 16 and reducing maintenance cost, and reducing maintenance cost by reducing scale and frequency of cleaning inside furnace It is possible to prevent damage to the inside of the furnace due to the fall of the grown dust D.

Further, in the stoker type incinerator 3 provided with the dust removing device 1, a striking force distribution means 21 for dispersing the striking force of each striking device 20 is provided between the outer surface of the water pipe wall 18 and each striking device 20. Since it is interposed, the striking force of the striking device 20 can be transmitted to the water pipe wall 18 in a wide range, and the dust D adhering to the boiler radiant heat transfer surface (the inner side surface of the water pipe wall 18) can be more reliably generated. And it can be removed satisfactorily.

Further, in the stoker-type incinerator 3 provided with the dust removing device 1, each striking device 20 is operated based on the temperature detected on the inlet side of the superheater 16 of the boiler 2, so that the superheater 16 is not corroded. Can be further suppressed.

Further, in the stoker type incinerator 3 provided with the dust removing device 1, the operation frequency of each striking device 20 is controlled by the timer 25 so that the heat is attached to the boiler radiant heat transfer surface (inner side surface of the water pipe wall 18). The dust D can be removed more reliably and satisfactorily.

Further, in the stoker type incinerator 3 provided with the dust removing device 1, the striking force dispersing means 21 has a plurality of water pipe protecting protectors 21a which come into contact with the plurality of water pipes 18a of the water pipe wall 18, and each water pipe protecting means 21a. Since the striker 21b is fixed to the protector 21a and receives the striking force of the striking device 20, the striking force of the striking device 20 is not directly transmitted to the water pipe wall 18, It is possible to prevent the water pipe wall 18 from being damaged or destroyed.

Further, in the stoker type incinerator 3 provided with the dust removing device 1, since the soundproofing means 27 is provided around each striking device 20, noise pollution by the striking device 20 can be suppressed.

The boiler 2 having a heat transfer area of 2100 m ² (primary combustion chamber 11+secondary combustion chamber 12:700 m ² , first radiant heat transfer chamber 14+second radiant heat transfer chamber 15:300 m ² , superheater 16:1100 m ² ). In the stoker type incinerator 3 attached with, the temperature rise of the gas temperature on the inlet side of the superheater 16 due to the passage of time can be suppressed to about 30°C to 50°C as an expected value.

FIG. 6 shows a modified example of the dust removing device 1, in which nine water pipe protecting protectors 21a of the striking force dispersing means 21 are used and a box-shaped hitting seat 21b is formed horizontally. The same members and parts as those of the dust removing device 1 shown in FIGS. 2 to 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the present embodiment, the length of each water pipe protection protector 21a is set to 340 mm. The width W of the tapping seat 21b on the opening side is set to 810 mm, and the length L of the tapping seat 21b on the opening side is set to 340 mm (see FIG. 6A). Further, the height H of the tapping seat 21b is set so that the distance from the center position in the thickness direction of the fin 18b of the water pipe wall 18 to the outer surface of the tapping seat 21b is 125 mm (FIG. 6(B)). reference).

The stoker-type incinerator 3 provided with the dust removing device 1 shown in FIG. 6 can also achieve the same effects as the stoker-type incinerator 3 having the dust removing device 1 shown in FIGS.

FIG. 7 shows still another modification of the dust removing device 1, in which the water pipe protecting protector 21a of the striking force dispersing means 21 is one, and the water pipe protecting protector 21a is a rectangular metal plate such as a steel plate. The both ends of the water pipe wall 18 are bent to form a rectangular plate-shaped water pipe protection protector 21a. This rectangular plate-shaped water pipe protecting protector 21a is fixed to the outer surfaces of the fins 18b of the water tube wall 18 by welding a while being in contact with the outer surfaces of the plurality of water tubes 18a of the water tube wall 18. (See FIG. 6B).

The striking device 20 and the striking seat 21b have the same shape and structure as the striking device 20 and the striking seat 21b of the dust removing device 1 shown in FIGS. The same members and parts as those of the device 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

The stoker type incinerator 3 provided with the dust removing apparatus 1 shown in FIG. 7 can also achieve the same operation and effect as the stoker type incinerator 3 having the dust removing apparatus 1 shown in FIGS. Moreover, since the protector 21a for protecting the water pipe is a single piece, mounting of the protector 21a for protecting the water pipe on the water pipe wall 18 is quick and easy as compared with the dust removing device 1 shown in FIGS. 2 to 4 and 6. Therefore, the dust removing device 1 can be installed in a short time.

In the above embodiment, the stoker incinerator 3 is used as the waste treatment furnace equipped with the boiler 2, and the dust removing device 1 is provided in the stoker incinerator 3; however, other embodiments In this case, a circulating fluidized bed boiler, a fluidized bed type incinerator, a combustion type melting furnace, or the like may be used as the waste treatment furnace equipped with the boiler 2, and the dust removing device 1 may be provided in these.

Further, in the above embodiment, the air knocker is used for the striking device 20, but in another embodiment, the electromagnetic knocker or the hammering device is used for the striking device 20, and the striking force dispersion is performed by the electromagnetic knocker or the hammering device. The striking seat 21b of the means 21 may be impacted, or several types of striking devices 20 may be used in combination.

Further, in the above-described embodiment, the size of the striking force dispersion means 21 is set to the size that the five water pipe protectors 21a cover the five or nine water pipes 18a. The size is not limited to the one according to the embodiment, and may be any size as long as the dust D adhering to the inner surface of the water pipe wall 18 can be reliably and satisfactorily removed. For example, the impact force dispersion means 21 may be sized so that the water pipe protecting protector 21a covers several, ten, or dozens of water pipes 18a.

1 is a dust remover 2 is a boiler 3 is a stoker incinerator 12 is a secondary combustion chamber 14 is a first radiant heat transfer chamber 15 is a second radiant heat transfer chamber 16 is a superheater 17 is a convection heat transfer chamber 18 is a water pipe Wall 18a is water pipe 18b is fin 20 is striking device 21 is striking force dispersion means 21a is water pipe protector 21b is hitting seat 25 is timer 26 is temperature detector 27 is soundproofing means D is dust

The present invention relates to a dust removing method and a dust removing apparatus for a boiler radiant heat transfer surface in a stoker type incinerator equipped with a boiler for treating waste such as municipal waste and industrial waste.

The present invention has been made in view of the above problems, and an object thereof is to solve the problems of cleaning the inside of a furnace by workers, the problems of a water injection device and the pressure wave generator, and to solve the problems of boiler radiation transmission. Suppressing the amount of power generation due to deterioration of heat transfer performance on the hot side, extending the life of the boiler by suppressing corrosion of the superheater and reducing maintenance costs, reducing maintenance costs by reducing the scale and frequency of in-furnace cleaning, and reducing the amount of grown dust It is an object of the present invention to provide a dust removing method and a dust removing apparatus for a boiler radiant heat transfer surface in a stoker type incinerator having a boiler capable of preventing damage to the inside of the furnace due to dropping.

In order to achieve the above object, the invention according to claim 1 of the present invention is a method for removing dust from a boiler radiant heat transfer surface in a stoker type incinerator equipped with a boiler, which is a secondary method of the stoker type incinerator. An outer surface of a side wall of a water pipe wall forming an upper space of the combustion chamber, an outer surface of a side wall of a water pipe wall forming the first radiant heat transfer chamber and the second radiant heat transfer chamber of the boiler, and the second radiant heat transfer chamber. A bottom wall outer surface of the water pipe wall forming the, the side wall outer surface of the water pipe wall forming the convection heat transfer chamber of the boiler, respectively, a plurality of striking device is arranged, each of the water pipe by the plurality of striking device It is characterized in that a striking force is applied to the wall to vibrate each water pipe wall itself to remove dust adhering to the inner surface of each water pipe wall forming a radiant heat transfer surface of the boiler .

In the invention according to claim 2 of the present invention, in the invention according to claim 1, a striking for dispersing the striking force of each striking device between the outer surface of each water pipe wall and each striking device. It is characterized in that force striking means is provided so that the striking force of each striking device is dispersed by each striking force dispersing means and is transmitted to each water pipe wall .

The invention of claim 3 of the present invention is characterized in that, in the invention of claim 1 or 2, the driving frequency of each of the impacting devices is controlled by a timer .

According to a fourth aspect of the present invention, in the invention according to the first or second aspect, each of the impact devices detects the inlet side temperature of the superheater of the boiler with a temperature detector, and the inlet side of the superheater is detected. It is characterized in that it operates when the temperature exceeds a predetermined temperature .

According to a fifth aspect of the present invention, in the invention according to the second aspect, the impact force dispersing means includes a plurality of water pipes and a water pipe wall provided with fins that connect adjacent water pipes to each other. A plurality of water pipe protection protectors, which are arranged in contact with the outer surfaces of the plurality of water pipes, and whose both ends are fixed to the outer surfaces of the fins of the water pipe wall, and are fixed to the respective water pipe protection protectors. It is characterized in that the striking force distribution means is provided with a striking seat that receives the striking force of the above and transmits to the protector for each water pipe .
The invention according to claim 6 of the present invention is, in the invention according to claim 2, a water pipe wall provided with fins that connect a plurality of water pipes and adjacent water pipes to each of the striking force dispersion means. A water pipe protection protector arranged in contact with the outer surfaces of the plurality of water pipes and having both ends fixed to the outer surface of the fin of the water pipe wall, and a water pipe protection protector, and a striking device. It is characterized in that the striking force distribution means is provided with a striking seat which receives the striking force of 1 and transmits it to one protector for water pipe.

The invention according to claim 7 of the present invention is a dust removing device for a boiler radiant heat transfer surface in a stoker type incinerator having a boiler, which forms an upper space of a secondary combustion chamber of the stoker type incinerator. Outer side wall outer surface of the water pipe wall, outer side wall outer surface of the water pipe wall forming the first and second radiant heat transfer chambers of the boiler, bottom of the water pipe wall forming the second radiant heat transfer chamber A plurality of striking devices respectively disposed on the outer surface of the wall, the outer surface of the side wall of the water tube wall forming the convection heat transfer chamber of the boiler, and the water tube walls having inner surfaces serving as radiant heat transfer surfaces of the boiler. It is characterized in that it is provided between each of the striking devices and has a striking force distribution means for dispersing the striking force of each of the striking devices and transmitting the striking force to each of the water pipe walls .

The invention according to claim 8 of the present invention is characterized in that, in the invention according to claim 7 , each of the striking devices is at least one of an air knocker, an electromagnetic knocker, and a hammering device .

In the invention according to claim 9 of the present invention, in the invention according to claim 7 , each of the striking force distribution means has a plurality of water pipes and a water pipe wall provided with fins that connect adjacent water pipes to each other. A plurality of water pipe protection protectors, which are arranged in contact with the outer surfaces of the plurality of water pipes, and whose both ends are fixed to the outer surfaces of the fins of the water pipe wall, and are fixed to the respective water pipe protection protectors. It is characterized in that it is provided with a striking seat that receives the striking force of the above and transmits it to each water pipe protecting protector .

According to a tenth aspect of the present invention, in the invention according to the seventh aspect , each of the striking force dispersing means has a plurality of water pipes and the water pipe wall provided with fins that connect adjacent water pipes to each other. One water pipe protection protector, which is placed in contact with the outer surface of multiple water pipes and has both ends fixed to the outer surface of the fin of the water pipe wall, and the water pipe protection protector. It is characterized in that it has a striking seat that receives a force and transmits it to one protector for protecting a water pipe .

The invention according to claim 11 of the present invention is characterized in that, in the invention according to claim 7, claim 8, claim 9 or claim 10 , a soundproof means is provided around each of the striking devices. ..

According to a twelfth aspect of the present invention, in the invention according to the seventh aspect, the eighth aspect, the ninth aspect, the tenth aspect, or the eleventh aspect , the dust removing device determines an operating frequency of each impacting device. It is characterized by having a timer to control it .

According to a thirteenth aspect of the present invention, in the invention according to the seventh aspect, the eighth aspect, the ninth aspect, the tenth aspect, or the eleventh aspect , the dust removing device is an inlet side of a superheater of a boiler. It is characterized in that a temperature detector for detecting the temperature is provided, and each striking device is activated when the inlet side temperature of the superheater exceeds a predetermined temperature .

As shown in FIGS. 2 to 4, the striking seat 21b is formed of a metal plate such as a steel plate into a box shape having an open surface facing the outer surface of the water pipe wall 18, and the box striking seat 21b. The open ends of are fixed to the outer surface of each of the five water pipe protection protectors 21a by welding a. The striking seat 21b disperses the striking force of the striking device 20 and transmits the striking force to each water pipe 18a of the water pipe wall 18, and the mounting base 20b of the striking device 20 is provided at the center of the outer surface of the striking seat 21b. It is fixed by welding a.

In order to achieve the above object, the invention according to claim 1 of the present invention is a method for removing dust from a boiler radiant heat transfer surface in a stoker type incinerator equipped with a boiler, which is a secondary method of the stoker type incinerator. An outer surface of a side wall of a water pipe wall forming an upper space of the combustion chamber, an outer surface of a side wall of a water pipe wall forming the first radiant heat transfer chamber and the second radiant heat transfer chamber of the boiler, and the second radiant heat transfer chamber. The bottom wall outer surface of the water pipe wall forming the, a plurality of striking devices are respectively disposed on the side wall outer surface of the water pipe wall forming the convection heat transfer chamber of the boiler, and the outer surface of each water pipe wall. A striking force dispersing means for dispersing the striking force of each striking device is provided between each striking device, and each striking force dispersing means is provided with a fin that connects a plurality of water pipes and adjacent water pipes. A plurality of water pipe protection protectors, which are arranged in contact with the outer surfaces of the plurality of water pipes of the water pipe wall, and whose both ends are fixed to the outer surfaces of the fins of the water pipe wall, and the respective water pipe protection protectors. And a striking force distribution means having a striking seat for transmitting the striking force of the striking device to each water pipe protecting protector, and applying the striking force to each of the water pipe walls by the plurality of striking devices. It is characterized in that each water pipe wall itself is vibrated to remove dust adhering to the inner surface of each water pipe wall forming the radiant heat transfer surface of the boiler.

The invention according to claim 2 of the present invention is a method for removing dust from a boiler radiant heat transfer surface in a stoker-type incinerator having a boiler, which forms an upper space of a secondary combustion chamber of the stoker-type incinerator. Outer side wall outer surface of the water pipe wall, outer side wall outer surface of the water pipe wall forming the first and second radiant heat transfer chambers of the boiler, bottom of the water pipe wall forming the second radiant heat transfer chamber A plurality of striking devices are respectively arranged on the outer surface of the wall and on the outer surface of the side wall of the water pipe wall forming the convection heat transfer chamber of the boiler, and between the outer surface of each water pipe wall and each striking device. The striking force dispersing means for dispersing the striking force of each striking device is provided, and each striking force dispersing means includes a plurality of water pipes and a plurality of water pipe walls provided with fins that connect adjacent water pipes to each other. Is placed in contact with the outer surface of the water pipe, and both ends are fixed to the water pipe protection protector that is fixed to the outer surface of the fin of the water pipe wall, and the water pipe protection protector. A striking force distribution means including a hitting seat for receiving and transmitting to one water pipe protecting protector, and imparting a striking force to each water pipe wall by the plurality of striking devices to vibrate each water pipe wall itself, It is characterized in that the dust adhering to the inner surface of each of the water pipe walls forming the radiant heat transfer surface of the boiler is removed .

The invention according to claim 5 of the present invention is a dust removing device for a boiler radiant heat transfer surface in a stoker type incinerator having a boiler, which forms an upper space of a secondary combustion chamber of the stoker type incinerator. Outer side wall outer surface of the water pipe wall, outer side wall outer surface of the water pipe wall forming the first and second radiant heat transfer chambers of the boiler, bottom of the water pipe wall forming the second radiant heat transfer chamber A plurality of striking devices respectively disposed on the outer surface of the wall, the outer surface of the side wall of the water tube wall forming the convection heat transfer chamber of the boiler, and the water tube walls having inner surfaces serving as radiant heat transfer surfaces of the boiler. And a striking force dispersion unit that disperses the striking force of each striking device and transmits the striking force of each striking device to each of the water pipe walls. Arranged in contact with the outer surfaces of the plurality of water pipes of the water pipe wall including the water pipe of the book and fins that connect adjacent water pipes, and both ends are fixed to the outer surface of the fin of the water pipe wall. It is characterized in that it is provided with a plurality of water pipe protecting protectors, and a strike seat fixed to each water pipe protecting protector and receiving a striking force of a striking device and transmitting to the respective water pipe protecting protectors .

The invention according to claim 6 of the present invention is a dust removing device for a boiler radiant heat transfer surface in a stoker type incinerator having a boiler, which forms an upper space of a secondary combustion chamber of the stoker type incinerator. Outer side wall outer surface of the water pipe wall, outer side wall outer surface of the water pipe wall forming the first and second radiant heat transfer chambers of the boiler, bottom of the water pipe wall forming the second radiant heat transfer chamber A plurality of striking devices respectively disposed on the outer surface of the wall, the outer surface of the side wall of the water tube wall forming the convection heat transfer chamber of the boiler, and the water tube walls having inner surfaces serving as radiant heat transfer surfaces of the boiler. And a striking force dispersion unit that disperses the striking force of each striking device and transmits the striking force of each striking device to each of the water pipe walls. The water pipe wall and the fins that connect adjacent water pipes are arranged in contact with the outer surfaces of the plurality of water pipes, and both ends are fixed to the outer surfaces of the fins of the water pipe wall. It is characterized in that it has one protector for protecting the water pipe and a strike seat fixedly attached to the protector for protecting the water pipe and transmitting to the protector for protecting the water pipe by receiving the striking force of the striking device .

The invention according to claim 7 of the present invention is characterized in that, in the invention according to claim 5 or 6 , each of the impact devices is at least one of an air knocker, an electromagnetic knocker, and a hammering device. is there.

The invention according to claim 8 of the present invention is characterized in that, in the invention according to any one of claims 5, 6 and 7 , a soundproofing means is provided around each of the striking devices. ..

According to a ninth aspect of the present invention, in the invention according to any one of the fifth, sixth, seventh and eighth aspects, the dust removing device controls the operating frequency of each impacting device. The feature is that it has a timer to do.

According to a tenth aspect of the present invention, in the invention according to any one of the fifth, sixth, seventh, and eighth aspects, the dust removing device is provided at an inlet side temperature of a boiler superheater. It is characterized in that it is equipped with a temperature detector for detecting that each striking device is activated when the temperature on the inlet side of the superheater exceeds a predetermined temperature .

Claims (12)

A method for removing dust from a boiler radiant heat transfer surface in a waste treatment furnace equipped with a boiler, wherein water is struck by a plurality of striking devices arranged outside the water pipe wall where the inner surface is the boiler radiant heat transfer surface. Disposal equipped with a boiler characterized in that the water wall itself is vibrated by applying a striking force to the wall to remove dust adhering to the inner surface of the water wall forming the radiant heat transfer surface of the boiler. Method for removing dust from the radiant heat transfer surface of a boiler in a material treatment furnace. A waste treatment furnace equipped with a boiler is a stoker-type incinerator, and a plurality of striking devices disposed at positions outside each water pipe wall forming at least a radiant heat transfer chamber and a convection heat transfer chamber of the stoker-type incinerator. By applying a striking force to each water pipe wall to vibrate each water pipe wall itself, dust attached to the inner surface of each water pipe wall forming the radiant heat transfer surface of the boiler is removed. A method of removing dust from a radiant heat transfer surface of a boiler in a waste treatment furnace provided with the boiler according to claim 1. Between the outer surface of the water pipe wall and each striking device, a striking force dispersing means for dispersing the striking force of each striking device is provided, and the striking force of each striking device is dispersed by the striking force dispersing means to produce water. A method for removing dust from a radiant heat transfer surface of a boiler in a waste treatment furnace equipped with the boiler according to claim 1 or 2, wherein the dust is transferred to a pipe wall. The operation frequency of the striking device is controlled by a timer, and the radiant heat transfer surface of the boiler in the waste treatment furnace having the boiler according to any one of claims 1, 2 and 3. Dust removal method. The said striking device detects the inlet side temperature of the superheater of the boiler with a temperature detector, and is adapted to operate when the inlet side temperature of the superheater exceeds a predetermined temperature. A method for removing dust from a radiant heat transfer surface of a boiler in a waste treatment furnace provided with the boiler according to claim 2 or 3. A dust removing device for a boiler radiant heat transfer surface in a waste treatment furnace equipped with a boiler, wherein a plurality of striking devices are provided at an outer position of a water pipe wall whose inner surface is the boiler radiant heat transfer surface, A boiler is provided which is provided between the water pipe wall and each striking device, and is provided with striking force distribution means for dispersing the striking force of each striking device and transmitting the striking force to the water pipe wall. Dust removal device for boiler radiant heat transfer surface in waste treatment furnace. The dust removing device for a boiler heat transfer surface in a waste treatment furnace having a boiler according to claim 6, wherein the striking device is at least one of an air knocker, an electromagnetic knocker, and a hammering device. The striking force dispersion means is arranged in a state of being in contact with the outer surface of each of the plurality of water pipes and the outer surface of the plurality of water pipes having fins that connect adjacent water pipes to each other. A plurality of water pipe protection protectors fixed to the outer surface of the fin, and a striker fixed to each water pipe protection protector, which receives the striking force of the striking device and transmits it to each water pipe protection protector. A dust removing device for a radiant heat transfer surface of a boiler in a waste treatment furnace provided with the boiler according to claim 6. The striking force distribution means is arranged in a state of contacting the outer surfaces of the plurality of water pipes of the water pipe wall provided with fins for connecting a plurality of water pipes and adjacent water pipes, and both ends of the water pipe wall It is provided with one water pipe protection protector fixed to the outer surface of the fin and a striking seat fixed to the water pipe protection protector and transmitting to the one water pipe protection protector by receiving the striking force of the striking device. A dust removing device for a radiant heat transfer surface of a boiler in a waste treatment furnace provided with the boiler according to claim 6. A boiler radiant heat transfer in a waste treatment furnace equipped with the boiler according to any one of claims 6, 7, 8 and 9, characterized in that a soundproof means is provided around the striking device. Surface dust remover. The said dust removal apparatus is provided with the timer which controls the operating frequency of each hit|damage apparatus, The claim 6, Claim 7, Claim 8, Claim 9, or Claim 10 characterized by the above-mentioned. Dust removal device for boiler radiant heat transfer surface in a waste treatment furnace equipped with a boiler. The dust removing device includes a temperature detector for detecting the inlet side temperature of the superheater of the boiler, and each striking device is activated when the inlet side temperature of the superheater exceeds a predetermined temperature. A dust removing device for a boiler radiant heat transfer surface in a waste treatment furnace including the boiler according to claim 6, claim 7, claim 8, claim 9, or claim 10.

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