JP7199153B2 - incinerator - Google Patents

Description

The present invention relates to the configuration of a stoker-type incinerator.

Conventionally, a stoker-type incinerator is known, which has a furnace floor with a plurality of stages of fire grates arranged along the feeding direction of incinerated materials. In a stoker-type incinerator, the stoker transports the incinerator while sending combustion air from the bottom of the furnace through the gaps in the fire grate into the furnace. burn.

FIG. 5 is a sectional view of a conventional stoker-type incinerator. This figure shows a cross section perpendicular to the direction in which the incinerator is fed by the stoker 150 . Hereinafter, the horizontal direction orthogonal to the feeding direction of the incinerator is referred to as "furnace width direction Y". A conventional stoker 150 shown in FIG. 5 includes side fire grates 81 provided on both sides in the furnace width direction Y, and a main fire grate portion 8 provided between the side fire grates 81 in the furnace width direction Y. As shown in FIG. The side grate 81 is provided along the furnace side wall 80 extending along the feeding direction of the material to be incinerated. The main fire grate section 8 includes movable fire grate stages and fixed fire grate stages that are alternately arranged in the feeding direction of the incinerated material. Each fire grate stage of the movable grate stage and the fixed fire grate stage is composed of a plurality of fire grates arranged in the width direction Y of the furnace.

By reciprocating the movable grate stage with respect to the fixed grate stage of the main grate section 8, the incinerated material on the stoker 150 is transported in the feed direction. Due to the structure of the stoker 150, the fluidity of the transferred incineration materials differs depending on the position in the furnace width direction Y. As shown in FIG. Therefore, the thickness of the incinerator layer 90 on the stoker 150 tends to be larger in the central portion in the furnace width direction Y, which has good fluidity, compared to both side portions in the furnace width direction Y close to the furnace side wall 80 . The resistance of the combustion air blowing up the stoker 150 and the incinerated material layer 90 from the furnace bottom is proportional to the thickness of the incinerated material layer 90 . Therefore, the amount of combustion air blowing up from both side portions in the furnace width direction Y where the incinerator layer 90 is thin is larger than that at the furnace width direction Y center portion where the incinerator layer 90 is thicker. As a result, combustion of the material to be incinerated is promoted on both sides of the stoker 150 in the Y direction in the furnace width direction, resulting in local high-temperature combustion. Problems such as clinker being likely to be generated on the furnace side wall 80 and non-uniform combustion have arisen.

In order to solve such a problem, in the stoker described in Patent Document 1, the gap between the furnace side wall and the fire grate is airtightly sealed at both sides of the stoker in the furnace width direction, so that the combustion air is removed. Make sure it doesn't blow up.

JP-A-9-60827

However, in the stoker of Patent Document 1, since there is no combustion air blowing up the materials to be incinerated on both sides in the width direction of the furnace, there is a possibility that the combustion rate of the materials to be incinerated on both sides in the width direction of the furnace will be extremely reduced. be.

The present invention has been made in view of the above circumstances, and its object is to blow through combustion air while maintaining the fluidity of the incinerated material on both sides of the stoker in the width direction of the stoker in a stoker type incinerator. To suppress the occurrence of local high-temperature combustion by suppressing the

A stoker-type incinerator according to one aspect of the present invention includes:
furnace side walls provided on both sides in the furnace width direction;
a stoker provided between the furnace side walls;
a furnace ceiling that cooperates with the stoker and the furnace sidewall to form a combustion chamber within the furnace;
a combustion air supply device for supplying, below the stoker, combustion air to be passed through the stoker and fed into the combustion chamber;
The stoker is provided between a side fire grate provided inside the furnace side wall in the furnace width direction and on both sides of the stoker, and between the side fire grate, and the material to be incinerated is perpendicular to the furnace width direction. a main grate section comprising a plurality of grates including movable grates that operate to feed in the feed direction;
The furnace side wall has a projection projecting inward in the furnace width direction, and the height from the conveying surface of the stoker to the upper end of the projection is equal to or greater than the design maximum thickness of the incinerator layer on the stoker. The lower end of the protrusion is lower than the upper end and the height from the conveying surface of the stoker is smaller than the thickness of the incinerator layer on the stoker, and the lower surface of the protrusion allows the stoker A lowered ceiling surface covering both sides in the furnace width direction of the stoker from above at a predetermined distance from the conveying surface of the stoker is formed, and the lowered ceiling surface creates a gap between the furnace side wall and the side grate and a gap between the side grate and the main grate is covered.

In the stoker-type incinerator with the above configuration, the flow of the combustion air that blows up on both sides of the stoker in the furnace width direction is lowered and blocked by the ceiling surface, so the flow rate of the combustion air that passes through the stoker is compared to other parts. is limited to a non-zero flow rate. As a result, the occurrence of local high-temperature combustion on both sides of the stoker in the furnace width direction is suppressed while avoiding an extreme decrease in the fluidity of the incinerated material on the stoker and an extreme decrease in the combustion rate of the incinerated material. be able to.

By covering the gap between the furnace side wall and the side grate and the gap between the side grate and the main grate part with the lowered ceiling surface, the gap between the furnace side wall and the side grate and the side grate are covered. The flow of combustion air blowing up through the gap between the grate and the main grate is obstructed by the lowered ceiling surface. As a result, it is possible to suppress thermal damage to both side portions of the furnace side wall, the side fire grate, and the main fire grate in the furnace width direction, which have been severely damaged in the conventional stoker-type incinerator.

In the above-described stoker-type incinerator, the protruding portion extends in the furnace width direction up to a specific position in the furnace width direction of a fire grate adjacent to the side fire grate among the plurality of fire grates of the main fire grate section. It may protrude inward.

As a result, the gap between the furnace side wall and the side grate and the gap between the side grate and the main grate are covered from above by the lowered ceiling surface, and the furnace side wall, the side grate, and the main grate are covered from above. It is possible to suppress thermal damage on both sides in the width direction.

In the above-mentioned stoker-type incinerator, the predetermined interval may be a value within a predetermined range in which intrusion of incinerated materials on the stoker below the lowered ceiling surface is restricted.

As a result, infiltration of the incinerated material on the stoker to the lower side of the lowered ceiling surface is restricted, the amount of incinerated material restrained by the furnace side wall is reduced, and the thickness of the incinerated material layer on the stoker is reduced in the furnace width direction. can be homogenized. As a result, the flow resistance of the combustion air blowing up the incinerated material layer is made uniform in the furnace width direction, and the occurrence of local high-temperature combustion at both sides of the stoker in the furnace width direction can be suppressed.

In the stoker-type incinerator, the height from the conveying surface of the stoker to the upper end position of the protrusion is smaller than the height from the conveying surface to the ceiling surface of the furnace ceiling in the cross section in the furnace width direction, and , greater than the design maximum thickness of the incinerator layer on the stoker.

As a result, the transport passage for the incinerated material on the stoker is narrowed by the protruding portions protruding from both sides in the furnace width direction, and the thickness of the incinerated material layer on the stoker can be made uniform in the furnace width direction. As a result, the flow resistance of the combustion air blowing up the incinerated material layer is made uniform in the furnace width direction, and the occurrence of local high-temperature combustion at both sides of the stoker in the furnace width direction can be suppressed.

In the stoker-type incinerator, the stoker includes a dry stoker, a combustion stoker, and a post-combustion stoker that are provided in order along the feed direction, and the projecting portion extends from the dry stoker to the combustion stoker. It may be provided over a range of directions.

As a result, the area in which the protruding portion is provided can be minimized, and the volume of the combustion chamber and the transportation passage area for the incinerated materials on the stoker can be secured.

According to the present invention, in a stoker-type incinerator, local high-temperature combustion is prevented by suppressing blow-through of combustion air while maintaining the fluidity of the material to be incinerated on both sides of the stoker in the furnace width direction. can be suppressed.

FIG. 1 is a schematic diagram showing the overall configuration of an incineration plant including a stoker-type incinerator according to one embodiment of the present invention. FIG. 2 is a cross-sectional view of an incinerator including a stoker. FIG. 3 is a plan view of the stoker. FIG. 4 is a cross-sectional view of a variant of an incinerator including a stoker. FIG. 5 is a sectional view of a conventional stoker-type incinerator.

Next, embodiments of the present invention will be described with reference to the drawings.

[Schematic configuration of incineration plant 100]
First, the overall configuration of an incineration plant 100 including the stoker-type incinerator 1 according to this embodiment will be described. An incineration plant 100 shown in FIG. 1 includes an incinerator 1 that incinerates garbage, which is an example of a material to be incinerated, and a boiler 2 that recovers waste heat from the incinerator 1 . Furthermore, the incineration plant 100 includes a steam turbine 34 and a generator 35 that generate electricity using exhaust heat from the incinerator 1 recovered by the boiler 2 .

The incinerator 1 is provided with combustion chambers including a main combustion chamber 14 (primary combustion chamber) and a secondary combustion chamber 19 . In the main combustion chamber 14, there are a drying zone 55 for drying garbage, a combustion zone 56 for burning garbage, and a post-combustion zone 57 for incinerating garbage in this order. A transport mechanism 5 of the type is provided. A partition ceiling is provided in the furnace in parallel with the direction X in which the waste is fed by the transfer mechanism 5 . As described above, the incinerator 1 according to this embodiment is a parallel-flow incinerator, but the incinerator 1 to which the present invention is applied is not limited to this.

The transfer mechanism 5 is a stepped stoker comprising a drying stoker 15a provided in the drying zone 55, a combustion stoker 15b provided in the combustion zone 56, and a post-combustion stoker 15c provided in the post-combustion zone 57. 15 and a stoker drive device 42 for driving the stoker 15 . A discharge chute 18 for discharging incinerated ash from the main combustion chamber 14 is provided downstream of the post-combustion stoker 15c.

The stoker 15 is reciprocatingly driven by a stoker driving device 42 so as to send out dust downstream. The stoker drive device 42 includes drive cylinders 42a, 42b, 42c provided corresponding to the respective stoker 15a, 15b, 15c. The stoker 15a, 15b, 15c is oscillatingly driven by these drive cylinders 42a, 42b, 42c interlockingly or independently.

A wind box into which primary combustion air 51 is introduced is provided below the stoker 15 . Primary combustion air 51 is supplied to each windbox by a combustion air supply device 43 . The combustion air supply device 43 includes, for example, a blower 43a and a heater 43b. supplied to The windbox primary combustion air 51 is channeled through the stoker 15 and into the main combustion chamber 14 . Secondary combustion air 52 is also supplied from the ceiling of the main combustion chamber 14 into the main combustion chamber 14 .

An input hopper 12 is connected to the inlet of the main combustion chamber 14 via a chute 13 . A feeder 41 is provided at the entrance of the main combustion chamber 14 to push out the refuse onto the drying stoker 15a. The feeder 41 adjusts the amount of refuse to be thrown into the main combustion chamber 14 .

Next, the flow of garbage incineration in the incineration plant 100 having the above configuration will be described. Garbage thrown into the entrance of the main combustion chamber 14 from the throw-in hopper 12 of the incinerator 1 through the chute 13 is pushed out by the feeder 41 onto the drying stoker 15a. While passing through the drying zone 55, the dust is dried by the primary combustion air 51 and the radiant heat of the main combustion chamber 14 and ignited. Some of the ignited dust is thermally decomposed while passing through the combustion zone 56 to generate combustible thermal decomposition gas. This pyrolysis gas moves to the upper part of the main combustion chamber 14 together with the primary combustion air 51 and is flame-burned together with the secondary combustion air 52 . The temperature of the dust further rises due to heat radiation accompanying this flame combustion. In addition, the rest of the ignited garbage is burned while passing through the combustion zone 56 and the post-combustion zone 57, and the incineration ash remaining after combustion is discharged from the discharge chute 18 and sent to an ash treatment facility (not shown). The combustion exhaust gas from the main combustion chamber 14 is mixed with the secondary combustion air 52 blown out from the ceiling portion on the downstream side of the main combustion chamber 14 and is secondary-combusted in the secondary combustion chamber 19 .

The flue gas discharged from the secondary combustion chamber 19 is introduced into the flue 20 and used as a heat source for the boiler 2 here. A water pipe 23 is stretched around the flue 20, and the heat recovery water flowing through the water pipe 23 recovers heat from the flue gas passing through the flue 20, thereby partially vaporizing and becoming steam. Reflux to the boiler drum 24 in this state. The steam in boiler drum 24 is sent to superheater 25 . In the superheater 25, the steam sent from the boiler drum 24 is further superheated to high temperature and high pressure while passing through the superheating tube 27 installed in the flue 20, and sent to the steam turbine 34 that drives the generator 35. be done.

Further, the flue gas that has passed through the boiler 2 is discharged from the flue 20 to the exhaust path 28 . The exhaust path 28 is provided with a bag filter 31, an induced draft fan 32, and the like, and the exhaust gas from the boiler 2 is discharged from the chimney 33 into the atmosphere after the dust is separated by the bag filter 31.

[Grate damage suppression structure of incinerator 1]
The incinerator 1 described above has a fire grate damage suppression structure for suppressing damage to the fire grate of the stoker 15 . The grate damage control structure is primarily realized by the furnace side wall 80 forming the main combustion chamber 14 . The fire grate damage suppression structure of the incinerator 1 will be described in detail below.

FIG. 2 is a cross-sectional view of incinerator 1 including stoker 15 . In this figure, a section of the main combustion chamber 14 in the furnace width direction Y is shown. FIG. 3 is a plan view of the stoker 15. FIG. In this view, the outline of the furnace side wall 80 including the protrusion 86 is shown in phantom. As shown in FIGS. 2 and 3, furnace side walls 80 extending in the waste feeding direction X are provided on both sides of the stoker 15 in the furnace width direction Y. As shown in FIG. Furnace side wall 80 may comprise, for example, frame 88 and refractory bricks 89 supported by frame 88 . The main combustion chamber 14 is defined by the furnace side walls 80, the stoker 15 and the furnace ceiling 79 (see FIG. 1).

The stoker 15 includes side fire grates 81 provided on both sides of the stoker 15 in the furnace width direction Y, and main fire grates 8 provided between the side fire grates 81 .

The side grate 81 is arranged along the furnace side wall 80 extending in the feeding direction X immediately inside the furnace side wall 80 . The side grate 81 is supported on a frame 88 of the furnace side wall 80 and fixed in position relative to the furnace side wall 80 .

The main grate section 8 includes movable grate stages 82 and fixed grate stages 83 that are alternately arranged in the direction X of feeding waste. Each fire grate stage of the movable fire grate stage 82 and the fixed fire grate stage 83 is composed of a plurality of fire grates arranged in the furnace width direction Y. As shown in FIG. A fixed grate stage 83 is fixed in place relative to the furnace side wall 80 . The movable grate stage 82 is reciprocally driven obliquely upward in the feed direction X so as to feed the waste put into the furnace in the feed direction X by the stoker drive device 42 . The arrangement of the fire grates constituting the main fire grate section 8 is not limited to the present embodiment. A known arrangement, such as one in which the rows of movable grates arranged in the feed direction X are alternately arranged in the furnace width direction Y, may be used. Moreover, although the stoker 15 according to the present embodiment has a stepped shape that descends in the feeding direction X, it may have a slope shape that has a slope that descends in the feeding direction X.

A projecting portion 86 is formed on the furnace side wall 80 by partially protruding inward in the furnace width direction Y of the furnace side wall 80 located on the side of the stoker 15 having the above configuration. The protrusion 86 extends from the dry zone 55 to the combustion zone 56 of the main combustion chamber 14 . This is because, in the post-combustion zone 57, localized high-temperature combustion is originally less likely to occur, and the need for countermeasures for suppressing fire grate damage is low. However, the projecting portion 86 may be provided continuously from the drying zone 55 to the post-combustion zone 57 . The projecting portion 86 forms a downward ceiling surface 87 that covers both sides of the stoker 15 in the oven width direction Y from the conveying surface of the stoker 15 with a predetermined gap G therebetween. Here, let the height of the conveying surface of the stoker 15 be the height of the upper surface of the main fire grate 8 . In addition, in the cross section of the main combustion chamber 14 in the furnace width direction Y, the height of the upper surface of the main fire grate portion 8 is lower than the height of the upper surface of the side fire grate 81 .

The size of the gap G is such that the dust on the stoker 15 is restricted from entering below the lower ceiling surface 87, but the gas flow is allowed. The size of the gap G depends on the structure of the incinerator 1 and the nature of the waste, but may be, for example, about 50 to 200 mm.

The height H1 of the lower end of the protruding portion 86 is located above the conveying surface, which is the reference height H0, by the distance G (H1=H0+G). Note that the reference height H0 differs depending on the position in the feeding direction X because the conveying surface is provided with a slope.

The height H2 of the upper end of the protruding portion 86 is higher than the height H1 of the lower end, and is higher than or higher than the reference height H0 by the design maximum thickness T of the dust layer 90. (H2≧H0+T). The design maximum thickness T is a value specific to the incinerator 1 that is determined when the incinerator 1 is designed. The upper surface of the projecting portion 86 may be a gently sloping surface that rises outward in the furnace width direction Y from the height H2 of the upper end, as shown in FIG.

A projecting position P of the projecting portion 86 toward the inside in the furnace width direction Y is located inside the furnace width direction Y from the position P1 in the furnace width direction Y between the side fire grate 81 and the main fire grate portion 8 . In addition, the projecting position P is positioned further in the furnace width direction than the position P2 in the furnace width direction Y between two fire grates 8e from the end in the furnace width direction Y among the plurality of fire grates constituting the main fire grate portion 8. Outside Y. In other words, the protruding position P is within the width of the fire grate 8e adjacent to the side fire grate 81 among the plurality of fire grates forming the main fire grate portion 8. As shown in FIG. A gap between the furnace side wall 80 and the side grate 81 and a gap between the side grate 81 and the main grate 8 are covered by the lowered ceiling surface 87 formed by the projecting portion 86 .

As described above, the incinerator 1 of the present embodiment includes the furnace side walls 80 provided on both sides in the furnace width direction Y, the stoker 15 provided between the furnace side walls 80, the stoker 15 and the furnace side wall 80. A furnace ceiling 79 that cooperates to form a combustion chamber (main combustion chamber 14) in the furnace, and a combustion air supply that supplies combustion air below the stoker 15 to pass through the stoker 15 and be sent to the main combustion chamber 14. a device 43; The furnace side wall 80 has a projecting portion 86 projecting inward in the furnace width direction Y as a fire grate damage suppression structure. A downward ceiling surface 87 covering from above is formed with a predetermined gap G from the conveying surface.

On both sides of the stoker 15 in the furnace width direction Y, the flow of the combustion air that blows up is lowered and blocked by the ceiling surface 87, so the flow rate of the combustion air that passes through the stoker 15 is zero compared to other portions. no flow rate. As a result, the localized It is possible to suppress the occurrence of high temperature combustion.

In addition, in the incinerator 1 of the present embodiment, the stoker 15 has side grates 81 provided on both sides of the stoker 15 inside the furnace width direction Y of the furnace side wall 80 and between the side grates 81 on both sides. and has a main grate section 8 comprising a plurality of grate including a movable grate that operates to feed waste in the feed direction X orthogonal to the furnace width direction Y. A gap between the furnace side wall 80 and the side grate 81 and a gap between the side grate 81 and the main grate 8 are covered with the lowered ceiling surface 87 .

As a result, the flow of combustion air blowing up through the gap between the furnace side wall 80 and the side grate 81 and the gap between the side grate 81 and the main grate 8 is obstructed by the downward ceiling surface 87 . As a result, thermal damage to both side portions in the furnace width direction Y of the furnace side wall 80, the side fire grate 81, and the main fire grate portion 8, which were severely damaged in the conventional stoker-type incinerator, can be suppressed.

Further, in the incinerator 1 of the present embodiment, the projecting portion 86 extends up to a specific position in the furnace width direction Y of the fire grate 8e adjacent to the side fire grate 81 among the plurality of fire grates of the main fire grate section 8. It protrudes inward in the furnace width direction Y. The specific position is an arbitrary position within the width of the furnace width direction Y of the fire grate 8e.

As a result, the gap between the furnace side wall 80 and the side grate 81 and the gap between the side grate 81 and the main grate 8 are covered from above by the lowered ceiling surface 87, and the furnace side wall 80, the side grate 81, Also, thermal damage to both sides of the main fire grate 8 in the furnace width direction Y can be suppressed.

In addition, in the incinerator 1 of the present embodiment, the predetermined distance G between the conveying surface and the lowered ceiling surface 87 is included in the predetermined range in which the intrusion of garbage on the stoker 15 to the lower side of the lowered ceiling surface 87 is restricted. is a value that can be

As a result, the intrusion of dust on the stoker 15 below the lower ceiling surface 87 is restricted, the dust bound by the furnace side wall 80 is reduced, and the thickness of the dust layer 90 on the stoker 15 is reduced in the furnace width direction Y It can be made more uniform. As a result, the flow resistance of the combustion air blowing up the dust layer 90 is made uniform in the furnace width direction Y, and the occurrence of local high-temperature combustion on both sides of the stoker 15 in the furnace width direction Y can be suppressed.

Further, in the incinerator 1 of the present embodiment, the height H2 from the conveying surface of the stoker 15 to the upper end of the protrusion 86 is greater than the height from the conveying surface to the ceiling surface of the furnace ceiling 79 in the cross section in the furnace width direction Y. It is small and larger than the designed maximum thickness T of the dust layer 90 on the stoker 15 .

As a result, the dust transport passage on the stoker 15 is narrowed by the projecting portions 86 projecting from both sides in the furnace width direction Y, and the thickness of the dust layer 90 on the stoker 15 can be made uniform in the furnace width direction Y. . As a result, the flow resistance of the combustion air blowing up the dust layer 90 is made uniform in the furnace width direction Y, and the occurrence of local high-temperature combustion on both sides of the stoker 15 in the furnace width direction Y can be suppressed.

In addition, in the incinerator 1 of the present embodiment, the stoker 15 includes the dry stoker 15a, the combustion stoker 15b, and the post-combustion stoker 15c which are provided in order along the feed direction X, and the protruding part 86 extends from the dry stoker 15a. It is provided over a range in the feeding direction X up to the combustion stoker 15b.

Although preferred embodiments of the present invention have been described above, the present invention may also include modifications of the details of the specific structures and/or functions of the above embodiments without departing from the spirit of the present invention. .

1: Stoker type incinerator 2: Boiler 5: Transfer mechanism 8: Main fire grate 8e: Fire grate 12: Feeding hopper 13: Chute 14: Main combustion chamber 15: Stoker 15a: Drying stoker 15b: Combustion stoker 15c: Post-combustion Stoker 18: discharge chute 19: secondary combustion chamber 20: flue 23: water pipe 24: boiler drum 25: superheater 27: superheating pipe 28: exhaust passage 31: bag filter 32: induced draft blower 33: chimney 34: steam turbine 35: Generator 41: Feeder 42: Stoker drive devices 42a, 42b, 42c: Drive cylinder 43: Combustion air supply device 43a: Blower 43b: Heater 51: Primary combustion air 52: Secondary combustion air 55: Drying zone 56: Combustion zone 57 : Post-combustion zone 79 : Furnace ceiling 80 : Furnace side wall 81 : Side fire grate 82 : Movable fire grate stage 83 : Fixed fire grate stage 86 : Protrusion 87 : Ceiling surface 88 : Frame 89 : Refractory bricks 100 : Incineration plant

Claims (5)

furnace side walls provided on both sides in the furnace width direction;
a stoker provided between the furnace side walls;
a furnace ceiling that cooperates with the stoker and the furnace sidewall to form a combustion chamber within the furnace;
a combustion air supply device for supplying, below the stoker, combustion air to be passed through the stoker and fed into the combustion chamber;
The stoker is provided between a side fire grate provided inside the furnace side wall in the furnace width direction and on both sides of the stoker, and between the side fire grate, and the material to be incinerated is perpendicular to the furnace width direction. a main grate section comprising a plurality of grates including movable grates that operate to feed in the feed direction;
The furnace side wall has a projection projecting inward in the furnace width direction, and the height from the conveying surface of the stoker to the upper end of the projection is equal to or greater than the design maximum thickness of the incinerator layer on the stoker. The lower end of the protrusion is lower than the upper end and the height from the conveying surface of the stoker is smaller than the thickness of the incinerator layer on the stoker, and the lower surface of the protrusion allows the stoker A descending ceiling surface covering both sides of the furnace in the width direction of the stoker from above at a predetermined distance from the conveying surface of the stoker is formed, and the descending ceiling surface forms a gap between the furnace side wall and the side grate. gaps and gaps between the side grates and the main grate section are covered;
Stoker type incinerator. The projecting portion protrudes inward in the furnace width direction to a specific position in the furnace width direction of a fire grate adjacent to the side fire grate among the plurality of fire grates of the main fire grate,
The stoker-type incinerator according to claim 1. The predetermined interval is a value included in a predetermined range in which intrusion of the incinerated materials on the stoker below the lowered ceiling surface is restricted.
The stoker-type incinerator according to claim 1 or 2. In the cross section in the furnace width direction, the height from the conveying surface to the upper end position of the protrusion is smaller than the height from the conveying surface to the ceiling surface of the furnace ceiling, and the incinerated material on the stoker greater than the design maximum thickness of the layer,
The stoker-type incinerator according to any one of claims 1 to 3. The stoker includes a drying stoker, a combustion stoker, and a post-combustion stoker provided in order along the feed direction,
The projecting portion is provided over a range in the feeding direction from the drying stoker to the combustion stoker,
The stoker-type incinerator according to any one of claims 1 to 4.

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