JP2006023001A - Stepped stoker fired furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate discharge of ash or the like by preventing welding of the ash or slag of a matter to be burnt to a rooster. <P>SOLUTION: This stepped stoker fired furnace 1 comprises the rooster 2 formed in a stepped shape so as to successively transferring the matter to be burnt with burning and a pusher 3 provided in the rear of each step of the rooster 2 so as to be capable of protruding and retreating to retractably push and move the matter to be burnt to the lower step. The floor part 8 of each step of the rooster 2 is formed of a water-cooled wall 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention includes a rooster formed in a step shape so as to sequentially transfer the waste to be incinerated in order to incinerate municipal waste, etc., and to be moved back and forth behind each stage of the rooster. The present invention relates to a stepped stalker furnace provided with a pusher for extruding incinerated materials and moving them to a lower stage.

  A stair stalker furnace has a grate (rooster) installed in a staircase shape, and injects municipal waste and other incineration materials from a hopper-equipped feed pipe at the upper end of the grate. Combustion is performed by supplying combustion air while sliding down along, and combustibles (incineration ash) are discharged at the lower end side. The grate is provided with, for example, a fixed part and a moving part every other in the width direction, and dust is transferred and agitated by the swinging motion of the moving part grate.

  However, in the stepped stalker furnace configured as described above, it is difficult to sufficiently stir the dust layer and remove the deposit (unburned material) accumulated on the grate only by swinging the moving part. There is a problem that the liquid, powder or unburned content contained in the trash falls from the grate with the movement, and it takes time for the processing.

  Therefore, the present inventor has developed and applied for a stepped stalker furnace that can stir the dust layer and remove residual deposits, and can prevent liquids and the like from falling (see Patent Document 1).

  This stepped stalker furnace is provided in a staircase shape so as to transfer the incinerated material downward, a fixed rooster that burns the incinerated material on its upper surface, and a moving rooster that moves in the transfer direction along the upper surface of the fixed rooster Each of these roosters is mounted and integrally supported, and an air duct is provided for guiding combustion air to the upper surface.

  With the above configuration, the fixed rooster is burned with the incineration object by being supplied with combustion air from the air duct. Further, the moving rooster slides on the upper surface of the fixed rooster along with the air duct that supports the moving rooster, so that the incinerated material is slid down and transferred, and the residual deposits accumulated on the upper surface of the fixed rooster are removed.

JP-A-8-278209

  However, in the above-mentioned stepped stalker furnace, the roastol is made of an alloy, so that the roastol becomes hot due to incineration of the incinerated material, and the ash and slag of the incinerated material melt and adhere to the rooster. There has been a problem that it becomes difficult to discharge ash and the like.

  Therefore, the present invention has been devised in order to effectively solve such problems, and its purpose is to prevent the ash and slag of the incinerator from being welded to the rooster, and to discharge ash and the like. It is to provide a stepped stalker furnace that can be easily performed.

  In order to solve the above-mentioned problem, the invention of claim 1 is provided with a rooster formed in a step shape so as to sequentially transfer the incineration object downward while incinerated, and is provided to be movable forward and backward behind each step of the rooster. A stepped stalker furnace provided with a pusher that pushes out the incinerated material and moves it to a lower stage, wherein the floor portion of each stage of the rooster is formed with a water-cooled wall.

  The invention according to claim 2 is a stepped stalker furnace in which the water cooling walls of each stage of the rooster are connected to each other.

  The invention according to claim 3 is a stepped stalker furnace in which the water cooling wall is formed by arranging a plurality of water pipes in parallel in the width direction of the rooster.

  A fourth aspect of the present invention is a stepped stalker furnace in which a plurality of water tubes arranged in parallel are provided with a spacer for connecting water tubes adjacent in the width direction of the rooster.

  The invention according to claim 5 is a stepped stalker furnace in which air holes for supplying combustion air to the incineration object are formed in the spacer.

  The invention according to claim 6 is a stepped stalker furnace in which the air hole is formed in a portion of the spacer other than the floor portion of the rooster.

  The invention according to claim 7 is a stepped stalker furnace in which an air chamber is formed behind the rooster and air is supplied into the air chamber to blow combustion air from the air hole to the incineration object. .

  The invention according to claim 8 is a stepped stalker furnace in which the plurality of water pipes and the spacer are provided so as to extend in the moving direction of the pusher, and the pusher moves forward and backward with the water pipe and the spacer as guide rails. .

  The invention of claim 9 is a stepped stalker furnace in which the pusher is divided into a plurality of parts in the width direction of the rooster, and each of the divided pushers moves individually.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that the ash and slag of to-be-incinerated material weld to a rooster, and the outstanding effect that discharge | emission of ash etc. can be performed easily is exhibited.

  Next, a preferred embodiment for carrying out the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a side structural view showing a preferred embodiment of a stepped stalker furnace according to the present invention, FIG. 2 is a front sectional view showing a rooster of a stepped stalker furnace according to the present invention, and FIG. It is a front lineblock diagram showing a suitable embodiment of such a stepped stalker furnace.

  As shown in FIG. 1, a stepped stalker furnace 1 according to the present embodiment includes a rooster 2 formed in a step shape so as to sequentially transfer an incinerated object (not shown) downward, and the rooster And a pusher 3 that is provided behind the respective steps (back side of the step portion) so as to be able to advance and retract and moves the incineration object to a lower step.

  The rooster 2 is formed in a zigzag shape when viewed from the side, an incinerator 5 on which an incinerated object is placed, a pusher accommodating portion 6 that is formed behind the incinerator 5 and accommodates the pusher 3, and incineration And a step vertical portion 7 extending downward from the front end of the portion 5. The incinerator 5 is configured to project forward (left side in the figure) as it goes down, and has a floor 8 on which the incinerated object is placed. The pusher accommodating portion 6 includes an accommodating floor portion 9 extending rearward of the floor portion 8 of the incineration portion 5, an accommodating wall portion 10 that rises upward from the rear end of the accommodating floor portion 9, and a front side from the upper end of the accommodating wall portion 10. And an accommodating ceiling portion 11 extending to the top. Above the uppermost incineration unit 5, an input pipe 13 for supplying an incinerated material onto the rooster 2 is provided. A hopper (not shown) is provided on the top of the charging pipe 13, and an incineration object such as dust thrown into the hopper passes through the charging pipe 13 and falls onto the incineration unit 5 and is charged. .

  By the way, the present invention is characterized in that the floor portion 8 of the rooster 2 is formed by a water-cooled wall 12. The water cooling walls 12 of each stage of the rooster 2 are connected to each other. In the present embodiment, as shown in FIGS. 2 and 3, the water cooling wall 12 is formed by parallelly forming a plurality of water pipes 14 bent continuously from the upper end to the lower end in the width direction of the rooster 2. Has been. Between the water pipes 14 arranged in parallel, a spacer 23 is provided to connect the water pipes 14 adjacent to each other in the width direction of the rooster 2 in the width direction.

  The water pipe 14 is continuously bent so as to have the same shape as the cross-sectional shape of the rooster 2 (see FIG. 1), and a plurality of the water pipes 14 are juxtaposed in the width direction. The upper end of each water pipe 14 is connected to the upper header 15, and the lower end is connected to the lower header 16. As shown in FIG. 3, the lower header 16 is connected to a water supply line 18 connected to the lower end of the flash drum 17, and the upper header 15 is connected to a water recovery line 19 connected to the upper portion of the flash drum 17. Yes. The flash drum 17, the water supply line 18, the lower pipe 16, the water pipes 14, the upper pipe 16, and the water recovery line 19 constitute a circulation line 21. The water supply line 18 is provided with a circulation pump 22 for circulating water through the circulation line 21. The water recovery line 19 is provided with a restriction orifice 20 so as to adjust the water pressure in the circulation line 21. A replenishment line 24 for replenishing water in the drum is further provided above the flash drum 17.

  The spacer 23 is composed of a plate-like member formed of a refractory material or a heat-resistant alloy material, and is arranged on the floor surface 8 side of the water pipe 14 so as to span between adjacent water pipes 14. The spacer 23 is bent in substantially the same shape along the bend of the water pipe 14. Both ends of the spacer 23 in the width direction are fixed by welding to the outer peripheral surfaces of the water pipes 14 on both sides over the entire length, and are fixed so as to be airtight on the front and back sides.

  The spacer 23 is formed with an air hole 25 for supplying combustion air to the incineration object. The air holes 25 are formed in portions of the spacer 23 other than the floor portions 8 and 9 of the rooster 2, that is, the accommodation wall portion 10, the accommodation ceiling portion 11, and the step vertical portion 7. In the present embodiment, the air holes 25 are formed in the step vertical portion 7 and the accommodation wall portion 10.

  An air chamber 26 is formed behind the rooster 2. The air chamber 26 is partitioned by the rooster 2, the rear wall 27 surrounding the rear, and the side walls 28 covering both sides in the width direction. By supplying air into the air chamber 26 by an air supply fan (not shown) or the like, as shown by an arrow in FIG. 1, toward the incineration object located in the incineration unit 5 from the air hole 25. Combustion air is blown out.

  As shown in FIG. 2, the distance between the side walls 28 is set in consideration of the thermal expansion of the rooster 2. That is, both ends of the rooster 2 are configured to be in close contact with the rooster support groove 31 formed in the side wall 28 when the rooster 2 is thermally expanded by the combustion of the incinerated material. Thereby, at the time of incineration, air does not leak from the contact portion between the rooster 2 and the side wall 28, and the sealing performance of the air chamber 26 is improved.

  A support member 32 for supporting the load of the storage floor 9 and the pusher 3 is provided below the pusher storage 6 of the rooster 2. One end of the support member 32 is connected to the back surface of the storage floor 9, and the other end is connected to the fixed side such as the side wall 28. The support member 32 is fixed to the back surface of the spacer 23.

  The pusher 3 is made of a refractory material or a heat-resistant alloy material. An extension cylinder 29 for moving the pusher 3 back and forth is provided behind the pusher 3. The pusher 3 moves back and forth between the pusher housing 6 and the incinerator 5. At this time, the pusher 3 is formed with a protrusion (not shown) extending in the movement direction on the lower surface thereof, and the protrusion 3 is inserted between the spacers 23 located at the lower portion so that the pusher 3 is connected to the water pipe. 14 and the spacer 23 are configured to move forward and backward using the guide rail.

  The pusher 3 is divided into a plurality of parts in the width direction of the rooster 2, and a telescopic cylinder 29 is provided for each divided pusher 3. Each pusher 3 is configured to be movable forward and backward individually.

  Next, the operation of the stepped stalker furnace 1 configured as described above will be described.

First, the circulation pump 22 of the water supply line 18 is operated to circulate water in the water pipe 14 of the water cooling wall 12. At this time, the restriction orifice 20 is adjusted so that the pressure in the water pipe 14 is about 10 kg / cm ² G (98 × 10 ⁴ Pa). As a result, the evaporation of water in the water pipe 14 can be suppressed, so that corrosion in the pipe can be prevented. In addition, the amount of circulating water is such that the temperature below 100 ° C. can be raised at the lower part of the water-cooled wall 12 that is not a corroded region, and the incinerator 5 at the upper part of the water-cooled wall 12 can be raised to near the saturation temperature of HCl and SO _3. Set.

  Then, the incinerated material to be combusted is supplied from the supply pipe 13 to the uppermost incinerator 5. At the same time, by supplying air into the air chamber 26, combustion air is blown out from the air holes 25 toward the incineration object located in the incineration unit 5. Thereby, the incinerated material is efficiently burned. At this time, since the incineration part 5 of the rooster 2 comprises the rooster 2 with the water-cooled wall 12, the temperature is close to the water temperature, and the ash or the like of the incinerator is not melted. As the combustion proceeds, the temperature of the incinerator 5 rises, but the water pipe 14 does not reach 183 ° C. or higher, and the floor 8 does not rise to a temperature at which the ash of the incinerator is melted. Therefore, it is possible to prevent ash from welding to the rooster 2.

  Therefore, the incinerated object and its ash are easily transferred to the lower stage and discharged by extrusion of the pusher 3 described later. Furthermore, since the rooster 2 does not reach a high temperature, even if the water pipe 14 is made of carbon steel, it can sufficiently withstand long-term use.

  Moreover, since the floor portion 8 is formed in a plate shape without a gap by connecting the adjacent water pipes 14 with the spacers 23, dust, ash or unburned matter of the incinerated material falls to the back surface of the floor portion 8. Can be prevented.

  Further, the combustion efficiency is improved by supplying combustion air from the air holes 25. However, since the air holes 25 are formed in the step vertical portion 7 and the accommodating wall portion 10, Ashes and the like do not fall to the back surface of the floor 8. That is, when the air holes 25 are formed in the horizontal surface such as the floor surface 8, dust or ash of the incinerated material falls from the air holes 25, but in the present embodiment, the air holes 25 are not formed in the horizontal surface. So dust etc. will not fall. On the other hand, since the combustion air is blown out from the air holes 25 formed in the step vertical portion 7 and the like, even if dust or the like floats and approaches the air holes 25, the combustion air moves to the incineration unit 5 side. And blown away. The air holes 25 may be formed in the housing ceiling portion 11 of the pusher housing portion 6.

  In addition, although the rooster 2 is slightly thermally expanded due to a temperature rise, the distance between the side walls 28 is set in consideration of the thermal expansion of the rooster 2, so when the rooster 2 is thermally expanded, the rooster 2 and the side wall The 28 rooster support grooves 31 are in close contact with each other, so that air does not leak from the portion, and the sealing performance of the air chamber 26 can be improved.

  Then, after burning for a predetermined time, the pusher 3 is moved forward to push out the incinerated material and move to the lower stage. At this time, the pusher 3 moves using the spacers 23 located on the floor portion 8 and the accommodating floor portion 9 of the rooster 2 as guides, and therefore, the movement direction is restricted and the pusher 3 can move linearly. The pusher 3 divided in the width direction is shifted and moved. Thereby, the incinerated object on the incinerator 5 is separated and stirred in the width direction, and the combustion efficiency is improved. Moreover, by dividing the pusher 3, the amount of thermal expansion of each pusher 3 can be reduced, and deformation and cracking can be prevented.

  Furthermore, since the pusher 3 moves on the spacer 23 and the spacer 23 is directly supported by the support member 32, no load is applied to the water pipe 14. Further, even if the upper surface of the spacer 23 is worn by friction due to the movement of the pusher 3, it can be easily repaired without touching the water pipe 14 by performing overlay welding on the upper surface.

  Although the support member 32 is provided at the lower part of the pusher accommodating portion 6, the floor portion 8 having a structure projecting forward is supported by the rigidity of the water pipe 14. When this rigidity is insufficient, there is a space for providing a support member at the lower portion of the floor portion 8, and this can be provided.

  Moreover, in the said embodiment, although the rooster 2 was comprised with the water cooling wall 12, you may comprise the side wall 28 also with a water cooling wall. According to this, since the temperature rise of the side wall 28 in the vicinity of the incinerator 5 is suppressed and partial thermal expansion is prevented, the sealing performance of the air chamber 26 is improved.

  Furthermore, in the said embodiment, although the rooster 2 is formed with the water cooling wall 12 connected continuously from an upper end to a lower end, only the floor part 8 is comprised with a water cooling wall, and other parts are the same as before. It may be made of an alloy.

  As shown in FIG. 4, it is good also as a system similar to a boiler. In FIG. 4, 33 is an evaporation drum, 34 is a water supply pipe, 35 is a water level gauge, 36 is a steam pipe, and 37 is a pressure gauge. The water level gauge 35 detects the water level in the evaporating drum 33 and opens and closes an on-off valve 38 provided in the water supply pipe 34 according to the detected value to keep the water level in the evaporating drum 33 constant. Yes. The pressure gauge 37 detects the internal pressure in the evaporation drum 33, and when the detected value exceeds the saturated vapor pressure, the on-off valve 39 provided in the steam pipe 36 is opened. The other configurations are the same as those shown in FIG.

  According to the said structure, the inside of the water pipe 14 becomes always a saturated vapor pressure, and can be kept more than a dew point.

It is the side lineblock diagram showing suitable embodiment of the staircase type stalker furnace concerning the present invention. It is front sectional drawing which showed the rooster of the stepped stalker furnace which concerns on this invention. It is a front lineblock diagram showing a suitable embodiment of a stepped stalker furnace according to the present invention. It is the front block diagram which showed other suitable embodiment of the stepped stalker furnace which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stair type stalker furnace 2 Rostor 3 Pusher 8 Floor part 12 Water cooling wall 14 Water pipe 23 Spacer 25 Air hole 26 Air chamber

Claims (9)

  A rooster that is formed in a step shape so as to be sequentially transferred downward while incinerating the incinerated object, and a pusher that is provided so as to be movable forward and backward behind each stage of the rooster and that moves the incinerated object to a lower stage. A stepped stalker furnace comprising a water-cooled wall at each step of the rooster.   The stepped stalker furnace according to claim 1, wherein the water cooling walls of each stage of the rooster are connected to each other.   The stepped stalker furnace according to claim 1 or 2, wherein the water cooling wall is formed by arranging a plurality of water pipes in parallel in the width direction of the rooster.   The stepped stalker furnace according to claim 3, wherein a spacer is provided between the plurality of water pipes arranged in parallel to connect water pipes adjacent to each other in the width direction of the rooster.   The stepped stalker furnace according to claim 4, wherein an air hole for supplying combustion air to the incinerated object is formed in the spacer.   The stepped stalker furnace according to claim 5, wherein the air hole is formed in a portion of the spacer other than the floor portion of the rooster.   The stepped stalker furnace according to claim 5 or 6, wherein an air chamber is formed behind the rooster and combustion air is blown out from the air hole to the incinerated object by supplying air into the air chamber.   The stepped stalker according to any one of claims 4 to 7, wherein the plurality of water pipes and the spacer are provided so as to extend in a moving direction of the pusher, and the pusher moves forward and backward using the water pipe and the spacer as a guide rail. Furnace. The stepped stalker furnace according to any one of claims 1 to 8, wherein the pusher is divided into a plurality of parts in the width direction of the rooster, and the divided pushers are individually moved.

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