CN201487971U - A coal-fired boiler slag discharge device - Google Patents

Abstract

A coal-fired boiler slagging device, comprising a box between the slag well outlet of the coal-fired boiler and the slag conveyor, a grille composed of a plurality of heat-resistant metal rods supported in the box and located in the The slag crusher on the grille is used to squeeze the slag, and the rear part of the box (9) on the return side of the body (25) under the grille is provided with an ash discharge device. The utility model solves the technical problem that a large amount of dust accumulates between the grid and the box body for a long time, which affects the operation of the slag crusher and shortens the life of the slag crusher and the box body, and is especially suitable for slag discharge of various coal-fired boilers.

Description

A coal-fired boiler slag discharge device

technical field

The utility model relates to a slag discharge device, in particular to an output device for boiler bottom ash.

Background technique

At present, the slagging methods of coal-fired boilers in power stations include hydraulic slagging systems and equipment and dry slagging systems and equipment. Using hydraulic slag removal equipment, most high-temperature large slag and large coke will be granulated when dropped into the water, and become smaller slag blocks, which are convenient for transportation. However, the hydraulic slag removal system and equipment have the following disadvantages: (1) The slag falls directly into the cooling water from the bottom of the boiler, which wastes the combustible substances and heat contained in the ash slag, and the water vapor generated at the same time will corrode the bottom parts of the boiler; (2) The consumption of water resources is large, and the discharge of ash and slag water will cause environmental pollution, and the treatment cost is high; (3) The system is complex and the maintenance and repair costs are high. Therefore, dry slag removal technology is mostly used at present. However, the use of dry slag discharge equipment, without the granulation effect of water, will produce large slag blocks. If such large slag blocks fall directly on the slag conveyor, it is easy to damage the steel belt of the slag conveyor, and the size of the slag Both lumps and slag directly enter the slag machine, which will increase the load of the slag crusher, resulting in low efficiency and high failure rate of the slag crusher. In actual operation, sometimes the dry slag discharge system stops running due to clogging of the slag crusher, excessive load, inability to crush hard slag, disconnection of the chain, etc.

In order to solve the above problems, in the Chinese patent document CN2459550Y, a high-temperature ash dry conveying device for coal-fired boilers is disclosed, which has a steel belt slag conveyor, and a hydraulic slag crusher above the steel belt slag conveyor And a grille, the grille is installed under the hydraulic slag crusher, the hydraulic slag crusher and the grille are supported by the box, the upper part of the box is connected to the outlet of the slag well at the lower part of the boiler, and the lower part of the box is connected to the steel belt conveyor The top of the slag machine is connected. The grid is composed of several heat-resistant steel pipes, the two ends of the steel pipes are supported on the box body, and respectively connected with two cooling water pipes, the extrusion head of the hydraulic slag crusher uses the steel pipes forming the grid as guide rails Movement, the contact part of the extrusion head and the grille is wave-shaped, and the extrusion head is a pair of intermeshing tooth-shaped structures; due to the addition of a hydraulic slag crusher and grille at the bottom of the boiler, the large The slag cannot fall directly on the conveyor belt, which avoids the damage of the conveyor belt, and at the same time reduces the work of crushing the slag at the exit of the conveyor belt, prolonging the service life of the crusher and the overall life of the entire equipment. However, the above-mentioned high-temperature ash dry conveying device still has the following disadvantages in actual operation: part of the fly ash is scattered to the rear of the slag crusher during the slag crushing process, and the return journey of the slag crusher body will also carry part of the fly ash To the rear of the tank on the return side of the slag crusher, the fly ash gradually settles between the grill and the tank. A large amount of dust accumulated between the grid and the box for a long time will not only affect the operation of the crusher, but also shorten the service life of the crusher.

Utility model content

Therefore, the technical problem to be solved by the utility model is to provide a coal-fired boiler slagging device that prevents a large amount of dust from accumulating between the grid and the box for a long time.

Another technical problem to be solved by the utility model is to provide a coal-fired boiler slag discharge device that can repair and replace the grille without stopping the furnace.

Another technical problem to be solved by the utility model is to provide an extrusion head of a slag crusher that can easily bite and break large slag blocks.

In order to solve the above technical problems, the coal-fired boiler slag discharge device described in the utility model includes a box between the slag well outlet of the coal-fired boiler and the slag conveyor, and is supported in the box by a plurality of heat-resistant A grid composed of metal rods and a slag breaker located on the grid for squeezing slag, the slag breaker includes a body and a drive device for driving the body, and the body under the grid The rear of the box on the return side is provided with an ash discharge device.

The ash discharge device is an ash discharge door opened on the box body.

The ash discharge device is an ash storage hopper with an ash release door arranged on the box body.

The ash storage bucket is in the shape of a cuboid.

The long side of the ash hopper spans the entire width of the grate.

The grille is detachably fixed on the box body.

The two ends of the heat-resistant metal rod are supported on the box body through the support seat fixed on the box body, and at least one end of the heat-resistant metal rod is detachably fixed to the box body through a limiting device Above, the limiting device is used to limit the axial movement of the heat-resistant metal rod.

The limiting device includes an opening on the side wall of the box, which is suitable for the extraction of the heat-resistant metal rod, and a cover plate on the outside of the box for fixing the heat-resistant metal rod. A hole is provided on the cover plate, and a screw hole is provided inside one end of the heat-resistant metal rod provided with a limit device, and the screw hole is matched with a bolt passing through the hole on the cover plate to fix the heat-resistant metal rod.

The body includes a plurality of extrusion heads, and a plurality of tapered extrusion teeth are arranged on the working end surface of the extrusion head in the vertical direction.

The cone angle of the extrusion teeth is 60-90°.

Compared with the prior art, the above-mentioned technical solution of the utility model has the following advantages: (1) an ash storage bucket is provided to store part of the fly ash, so as to prevent the long-term accumulation of too much fly ash between the box body and the slag crusher, which is harmful to the normal operation of the equipment; operation is affected. (2) Each heat-resistant metal rod is detachably fixed on the box body, and its movement in the axial direction is limited by a limiting device. When a heat-resistant metal rod is broken or otherwise damaged and needs to be repaired, only the damaged heat-resistant metal rod can be pulled out without replacing the entire grid, so there is no need to stop the operation of the boiler, thereby improving production efficiency efficiency and save production cost; (3) conical extrusion teeth are set on the extrusion head, especially a plurality of conical extrusion teeth are arranged in the vertical direction of the working end face of the extrusion head, such setting is consistent with The tapered extrusion teeth exert more pressure on the slag than the previous flat teeth, gripping irregularly shaped chunks of slag more firmly and breaking them up more easily. The cone angle of the conical extrusion teeth is 60-90°, which can prevent the conical extrusion teeth from being insufficiently strong and easy to break due to an excessively small cone angle, and can also avoid the disadvantage of pressure reduction due to excessive cone angles. Cons of biting chunks of slag and crushing them.

Description of drawings

In order to make the content of the utility model easier to understand clearly, the utility model will be described in further detail below according to specific embodiments of the utility model in conjunction with the accompanying drawings, wherein

Fig. 1 is the front view of the coal-fired boiler slag discharge device described in the utility model;

Fig. 2 is a side view of the coal-fired boiler slag discharge device described in the utility model;

Fig. 3 is a structural schematic diagram of the limit device of the coal-fired boiler slag discharge device described in the present invention;

Fig. 4 is a top view of the coal-fired boiler slag discharge device described in the utility model;

Fig. 5 is a side view of the slag breaker of the coal-fired boiler slag discharge device described in the present invention;

Fig. 6 is a cross-sectional view along the A-A direction of the slag breaker of the coal-fired boiler slag discharge device described in the present invention;

Fig. 7 is a top view of a single slag breaker of the coal-fired boiler slag discharge device of the present invention;

Fig. 8 is a combination diagram of two slag crushers of the coal-fired boiler slag discharge device of the utility model.

The reference signs in the figure are expressed as: 1-slag conveyor, 2-grid, 3-slag crusher, 4-slag well outlet, 5-support seat, 6-heat-resistant metal rod, 7-extrusion head, 8 -extrusion tooth, 9-box, 10-cover plate, 11-screw hole, 12-slag well, 13-hanging ring screw, 14-guide coaming, 15-ash storage hopper, 16-observation hole, 17- Observation window, 18-camera window, 19-camera, 20-box column, 21-slag well column, 22-hydraulic cylinder, 23-push rod, 24-expansion joint, 25-body, 26-protective plate, 27- Baffle, 28-chute.

Detailed ways

The coal-fired boiler slagging device of the present invention is arranged below the slag well 12, and the slag well 12 is connected with the lower end of the furnace for leading the slag out of the furnace. The slag discharge device includes a box body 9 located between the slag well outlet 4 of the slag well 12 and the slag conveyor 1, and a grille composed of a plurality of heat-resistant metal rods 6 supported in the box body 9 2 and a slag breaker 3 for squeezing slag located on the grid 2. The grid 2 is used to prevent large pieces of slag from falling on the slag conveyor 1, and the slag breaker 3 is arranged on the grid 2 and can move on the grid 2 to remove the large pieces of slag. Extruded into small pieces of slag that can fall from the gap of the grid 2, the slag conveyor 1 is used to transport the ash and slag discharged from the slag shaft outlet 4 of the boiler to the slag and screening equipment.

Between the slag well outlet 4 of the coal-fired boiler and the slag crusher 3, a material guide device for restricting the slag from falling into the baffle of the slag crusher 3 is provided. In this embodiment, The material guiding device is a material guiding coaming 14 welded one week along the outlet 4 of the slag well, and the material guiding coaming 14 restricts the slag from falling to the slag crushing area of the slag crusher, preventing the slag from falling to the slag crusher The rear portion of 3 cannot be crushed, and the slag area refers to the area where the slag crusher 3 can crush the slag.

The box 9 is supported above the slag feeder 1 by a box column 20 for supporting the slag crusher 3 and the grid 2, and the upper part of the box 9 is provided with an expansion joint 24, which can absorb Boiler slag well downward thermal expansion, the side walls of the box 9 are connected by screws and nuts, in the case of damage to the slag breaker 3 and the grille 2, the screws can be removed to open the box 9 The side wall is repaired, so that the maintenance is more convenient. Appropriate positions of the box body 9 are respectively provided with a camera window 18 and an observation window 17 for observing the accumulation state of large slag on the grille. The accumulation status of the slag is recorded, and the image is transmitted to the display. The operator can judge the position of the large slag by observing the display and operate the corresponding extrusion head 7 to crush the large slag. Maintenance personnel can directly see the situation on the grille 2 through the observation window 17, and can open the observation window 17 to deal with iron pieces and other sundries falling on the grille 2.

The grid 2 is composed of a plurality of heat-resistant metal rods 6, the heat-resistant metal rods 6 are heat-resistant steel pipes in this embodiment, and the two ends of each heat-resistant steel pipe pass through the H-shaped support seat 5 It is supported on the box body 9 and limited to move axially in the heat-resistant steel pipe by a limiting device. The limiting device includes a screw hole 11 welded inside the end of the heat-resistant steel pipe, and an opening suitable for drawing out the heat-resistant steel pipe on the side wall of the box body 9 is arranged on the box body 9 The outside is used to seal the opening and fix the cover plate 10 of the heat-resistant steel pipe. The cover plate 10 is provided with a hole allowing the passage of the eye screw 13, and one end of the eye screw 13 passes through the cover plate 10 Cooperate with the screw hole 11 after the hole on. Of course, the shape of the support seat 5 can be changed according to the actual situation, for example, it can be a circular support seat fixed on the box body 9, as long as it can support the heat-resistant steel pipe. When a large piece of slag falls on the grille 2 and smashes one or several of the heat-resistant steel pipes of the grille 2, you can grasp and turn the lifting ring 13 to make the The eyebolt 13 is out of engagement with the screw hole 11, and the damaged heat-resistant steel pipe is pulled out for maintenance or replacement. Since only one or several heat-resistant steel pipes in the grid 2 are replaced, the slagging of the boiler will not be affected, so there is no need to shut down the furnace, and the grid 2 is fixed on the box or the Compared with the scheme designed as a whole, the present invention can improve the efficiency of production and maintenance and save manpower and material resources. The gap between the grids 2 can allow granular ash and smaller slag to fall directly on the slag conveyor 1 and transport away, while larger slag is intercepted on the grid 2, On the one hand, it can protect the slag conveyor 1 from damage, which is reflected in preventing the large pieces of slag from directly falling on the slag conveyor 1 and destroying the slag conveyor 1, and at the same time prolonging the cooling time of the large pieces of slag, so that Temperature has been reduced to the degree that can not damage slag conveyor 1 when it falls.

形的导料槽，并沿所述挡板27设置一周。A slag breaker 3 is arranged on the grille 2, and the slag breaker 3 includes a body 25 and a power device for driving the axial movement of the body, and a power device is provided between the body 25 and the power device. The push rod 23 that transmits power between the power device and the body 25, wherein the body 25 is provided with a plurality of extrusion heads 7, and the upper part of the body 25 is provided with a The protective plate 26 of the head, and the surrounding of the body 25 is provided with an upwardly protruding baffle 27, the position of the guide fence 14 is closer to the extrusion head than the position of the baffle 28, and the guide The lowermost end of the material enclosure 14 is lower than the uppermost end of the baffle. The lower part of the body 25 has a slide groove 28 suitable for moving the body 25 on the heat-resistant steel pipe of the grid 2 . The extruding heads 7 arranged on the same track move toward each other. The extrusion head 7 is provided with three quadrangular pyramid-shaped conical extrusion teeth 8 in the vertical direction, and the conical extrusion teeth 8 of the extrusion head 7 on the same track can mesh with each other and bite under the drive of power. chunks of slag and crush it. In this embodiment, three 60-90-degree conical extrusion teeth 8 are provided on the vertical direction of each extrusion head 7. Under the same driving force, compared with flat-headed teeth, the conical extrusion The tooth 8 acts on the slag with a greater pressure, which can bite the irregularly shaped large pieces of slag more firmly and break it more easily. In this embodiment, the driving device is a hydraulic cylinder 22 supported by a slag well column 21 . Each of the bodies 25 is driven by two parallel hydraulic cylinders 22 , and a push rod 23 for power transmission is provided between each of the hydraulic cylinders 22 and the body 25 . The hydraulic cylinder 22 is provided with a stroke switch to control the stroke of the extrusion head 7 . Another effect brought by the arrangement of the extrusion head 7 is that when the slag conveyor 1 breaks down, the extrusion head 7 can be closed, and the ash is temporarily stored in the slag well to prevent excessive ash from affecting the slag conveyor. Machine 1 is damaged. In addition, the material guide device used to limit the slag from falling into the baffle plate 27 of the slag crusher 3 in the present invention can also be designed as other structures that are convenient for the slag to fall, such as a cross-section of

Shaped material guide groove, and arrange a circle along described baffle plate 27.

The area not covered by the protective plate 26 under the grille 2 is provided with an ash discharge device. In this embodiment, the ash discharge device is an ash storage hopper 15 provided with an ash discharge door. The ash storage hopper 15 Part of the fly ash can be stored, and when the fly ash in the ash storage hopper accumulates to a certain extent, the ash discharge door can be opened to discharge part of the fly ash. The ash storage hopper 15 can prevent fly ash from accumulating between the box body 9 and the extrusion head 7, which will affect the normal operation of the equipment. The box body 9 is also provided with an observation hole 16, the observation hole 16 is located below the extruding head 7, the operator can observe the dust accumulation condition of the ash storage hopper 15 through the observation hole 16, when Can open ash opening door to remove the ash in the ash hopper 15 when accumulating ash more.

In the second embodiment, the inside of the end of the heat-resistant steel pipe is threaded to match the eyebolt. The extrusion teeth are conical in shape. The ash removal device is an ash discharge door arranged on the box body. When the dust between the box body and the grille accumulates to a certain extent, the ash discharge door can be opened to discharge part of the fly ash. Others are the same as the first embodiment.

In a third embodiment, the heat-resistant metal rod is a solid shaft. The two ends of the heat-resistant metal rod are respectively supported on the box body by the two support seats, and then fixed on the box body by the limit device respectively, that is, the two ends of the heat-resistant metal rod are respectively Go through the hole on the cover plate, and set a small hole perpendicular to the axial direction of the heat-resistant metal rod at the part where the heat-resistant metal rod exposes the box body, and a pin is pierced in the small hole The pin cooperates with the cover plate to limit the movement of the heat-resistant metal rod in the axial direction. Others are the same as the first embodiment.

In the fourth embodiment, one end of the heat-resistant metal rod is provided with a limiting device, one end of the heat-resistant metal rod passes through the hole on the cover plate, and a A small hole perpendicular to the axial direction of the heat-resistant metal rod. The box body is provided with two metal rings whose axis is perpendicular to the heat-resistant metal rod, and the pin passes through one of the metal rings, the small hole on the heat-resistant metal rod and the other The metal ring, the pin cooperates with the cover plate to limit the axial movement of the heat-resistant metal rod, and the other end of the heat-resistant metal rod is closed by the cover plate without holes. inside the box. Others are the same as the first embodiment.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the utility model.

Claims (10)

1. coal-burning boiler slag-draining device, comprise that the slag well that is positioned at coal-burning boiler exports the casing (9) between (4) and the slag conveyer (1), be supported on the barrier of forming by many heating resisting metal bars (6) (2) in the described casing (9) and be positioned at the slag crusher that is used for pushing slag (3) on the described barrier (2), it is characterized in that: described slag crusher comprises body (25) and is used to drive the drive unit of body motion that the rear portion of the described casing (9) of backhaul one side of described body (25) is provided with ash exhauster under described grid.

2. coal-burning boiler slag-draining device according to claim 1 is characterized in that: described ash exhauster is out the ash-draining gate on described casing.

3. coal-burning boiler slag-draining device according to claim 1 is characterized in that: described ash exhauster is to be arranged on to have the storage ash bucket (15) of putting the ash door on the described casing.

4. coal-burning boiler slag-draining device according to claim 3 is characterized in that: described storage ash bucket (15) is a cuboid.

5. coal-burning boiler slag-draining device according to claim 3 is characterized in that: the long side surface of described storage ash bucket (15) is striden whole grid width.

6. coal-burning boiler slag-draining device according to claim 1 is characterized in that: described barrier (2) removably is fixed on the described casing (9).

7. coal-burning boiler slag-draining device according to claim 1, it is characterized in that: the two ends of described heating resisting metal bar (6) are supported on the described casing (9) by the supporting base (5) that is fixed on the described casing (9), at least one end of described heating resisting metal bar (6) removably is fixed on the described casing (9) by stopping means, and described stopping means is used to limit described heating resisting metal bar (6) axially-movable.

8. coal-burning boiler slag-draining device according to claim 7, it is characterized in that: described stopping means comprises the opening that is suitable for described heating resisting metal bar (6) extraction on the sidewall of being located at described casing (9) and is located at the cover plate (10) that described casing (9) outside is used for fixing described heating resisting metal bar (6), described cover plate (10) is provided with the hole, the inside of an end that is provided with stopping means of described heating resisting metal bar (6) is provided with screw (11), and described screw (11) matches with the screw in hole on passing described cover plate (10) and is used for fixing described heating resisting metal bar (6).

9. coal-burning boiler slag-draining device according to claim 1 is characterized in that: described body (25) comprises a plurality of extrusion heads (7), is provided with the extruding tooth (8) of a plurality of tapers on the operative end surface of described extrusion head (7) at its vertical direction.

10. coal-burning boiler slag-draining device according to claim 9 is characterized in that: the cone angle of described extruding tooth (8) is 60-90 °.

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