JP2019184096A - Waste incineration facility - Google Patents

Abstract

To provide a waste incineration facility enabling the amount of emission of NOx therefrom to be further suppressed.SOLUTION: The waste incineration facility according to one embodiment comprises an incinerator including: a furnace chamber combusting waste; a secondary combustion chamber combusting combustion gas generated by combusting waste in the furnace chamber; and a drying stoker drying waste and a combustion stoker combusting waste which are arranged in a waste transportation direction on the bottom of the furnace chamber. The waste incineration facility further comprises: a gas discharge passage for discharging a part of gas in the upper space of the furnace chamber; a cleaning tower generating ammonia water by bringing ammonia gas included in gas discharged via the gas discharge passage into contact with water; and a noncatalytic denitrification equipment injecting the ammonia water generated in the cleaning tower into the secondary combustion chamber as denitrification agent.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a waste incineration facility for incinerating waste.

  Conventionally, incineration facilities including an incinerator for incinerating waste are known. In such a waste incineration facility, it is required to reduce nitrogen oxides (NOx) contained in exhaust gas generated during incineration. As one method for reducing nitrogen oxides in exhaust gas, it has been proposed to remove ammonia gas generated in the process of drying waste in an incinerator.

  For example, Patent Document 1 includes a stoker comprising a dry stoker and a combustion stoker, and supplies primary combustion air from the bottom of the stoker to the furnace chamber (primary combustion chamber) above the stoker to primarily burn sludge as waste on the stoker. An incineration facility is disclosed in which unburned gas and unburned material are subjected to secondary combustion in a recombustion chamber (secondary combustion chamber) above the furnace chamber. In this incineration facility, ammonia gas generated from sludge with a dry stoker is extracted from the air supply path and condensed and removed by a washing tower. Thus, in this incineration facility, the ammonia gas generated from the sludge is removed before burning in the furnace chamber, thereby suppressing the generation of nitrogen oxides in the furnace chamber.

JP 2013-253720 A

  An object of this invention is to provide the waste incineration equipment which can suppress the discharge | emission amount of nitrogen oxide more.

  In order to solve the above problems, a waste incineration facility according to one embodiment of the present invention includes a furnace chamber for burning waste, and a recombustion for burning combustion gas generated by combustion of waste in the furnace chamber An incinerator having a chamber, a drying stoker for drying the waste and a combustion stoker for burning the waste, arranged in the transport direction of the waste at the bottom of the furnace chamber, and a gas in an upper space of the furnace chamber A part of the gas discharge path, a cleaning tower for generating ammonia water by contacting ammonia gas contained in the gas discharged through the gas discharge path with water, and the cleaning tower And a non-catalytic denitration device that blows ammonia water as a denitration agent into the re-combustion chamber.

  According to the above configuration, the gas containing ammonia gas is discharged from the furnace chamber through the gas discharge passage, and the nitrogen oxide generated in the furnace chamber is blown into the recombustion chamber with the ammonia gas contained in the discharged gas. It is used as a denitration drug for For this reason, compared with the conventional incineration equipment which only removes ammonia gas from a furnace chamber, discharge | emission amount of nitrogen oxide can be suppressed more.

  In the above waste incineration facility, the furnace chamber has a furnace partition wall that extends downward from the upper wall of the furnace chamber and divides the upper space of the furnace chamber into an upstream space and a downstream space in the transport direction. The gas discharge path may be provided to discharge gas from the upstream space in the furnace chamber. According to this configuration, most of the ammonia gas generated when the waste is dried by the dry stalker that is the upstream stalker rises to the upstream space of the furnace chamber. For this reason, ammonia gas is efficiently removed from the furnace chamber by making the ammonia gas concentration in the gas discharged through the gas discharge path higher than when the gas is discharged from the entire upper space of the furnace chamber. can do.

  The waste incineration facility may include a gas return path that leads from the cleaning tower to the downstream space in the furnace chamber. According to this configuration, the gas in the upstream space of the furnace chamber discharged through the gas discharge path is removed from the furnace chamber through the gas return path after the ammonia gas in the gas is removed by the cleaning tower. It can be returned to the side space. Thereby, the unburned gas (carbon monoxide etc.) contained in the gas in the upstream space of the furnace chamber can be returned to the downstream space of the furnace chamber and burned. In addition, when the gas in the upstream space of the furnace chamber contains a reducing gas other than ammonia gas (such as hydrogen cyanide), the reducing gas can be used for a denitration reaction with nitrogen oxides in the furnace chamber. it can.

  In the waste incineration facility, the incinerator extends downward from a downstream end portion of an upper wall of the furnace chamber, and divides the downstream space and the recombustion chamber in the furnace chamber in the transport direction. You may provide the intermediate partition wall partitioned off like this. According to this configuration, the space on the downstream side of the furnace chamber is sandwiched between the furnace partition wall and the intermediate partition wall, thereby forming a space where gas can stay. For this reason, the combustion reaction of the unburned gas contained in the gas returned by the gas return path can be made easier to occur, and the reducing gas other than ammonia gas is included in the gas returned by the gas return path. In this case, a denitration reaction between the reducing gas and nitrogen oxide can be more easily generated.

  A waste incineration facility according to another aspect of the present invention includes a furnace chamber for burning waste, a recombustion chamber for burning combustion gas generated by combustion of waste in the furnace chamber, and the furnace chamber A drying stoker for drying the waste and a combustion stoker for burning the waste, arranged at the bottom of the furnace, and extending downward from the upper wall of the furnace chamber, and transporting the upper space of the furnace chamber An incinerator having a furnace partition wall that divides the upstream space and the downstream space in the direction, and a part of the gas in the upstream space of the furnace chamber is discharged, and the concentration of ammonia gas in the discharged gas is A gas passage that is supplied to the recombustion chamber in a maintained state.

  According to the above configuration, the furnace partition wall collects most of the ammonia gas generated when the waste is dried with the drying stalker, which is the upstream stalker, into the upstream space of the furnace chamber, and passes through the gas passage. To discharge the gas in the upstream space. Thereby, ammonia gas oxidized in the local high temperature region of the furnace chamber is reduced, and generation of nitrogen oxides in the furnace chamber can be suppressed. Furthermore, with respect to nitrogen oxide generated in a small amount in the furnace chamber, the gas discharged from the upstream space through the gas passage is supplied to the recombustion chamber that is relatively cooler than the furnace chamber. Thereby, the ammonia gas in the gas supplied through the gas passage (that is, the gas in the upstream space of the furnace chamber) can be used for the denitration reaction of nitrogen oxides in the recombustion chamber. For this reason, compared with the conventional incineration equipment which only removes ammonia gas from a furnace chamber, discharge | emission amount of nitrogen oxide can be suppressed more. Further, when the waste incineration facility includes a non-catalytic denitration device that blows ammonia water as a denitration agent into the recombustion chamber, the denitration agent to be blown can be saved.

  According to each aspect of the present invention described above, it is possible to provide a waste incineration facility that can further suppress the emission amount of nitrogen oxides.

It is a schematic block diagram of the waste incineration equipment which concerns on 1st Embodiment. It is a schematic block diagram of the waste incineration equipment which concerns on 2nd Embodiment.

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

(First embodiment)
FIG. 1 is a diagram illustrating a configuration of a waste incineration facility 1A according to the first embodiment. The waste incineration facility 1A includes an incinerator 2 and a denitration system 3A.

  The incinerator 2 performs incineration while conveying waste supplied from outside. The incinerator 2 has a furnace chamber 11, a recombustion chamber 12, and a plurality of stokers (a dry stoker 13, a combustion stoker 14, and a post-combustion stoker 15). In the following description, the “conveying direction” refers to the conveying direction of waste in the incinerator 2.

  The furnace chamber 11 burns the waste supplied from the inlet 2a of the incinerator 2 by a dust supply device (not shown). The recombustion chamber 12 is disposed downstream of the furnace chamber 11 in the conveying direction, and the recombustion chamber 12 burns unburned gas generated by combustion of waste in the furnace chamber 11. The temperature in the furnace chamber 11 is, for example, 1000 ° C to 1200 ° C. Moreover, the temperature in the recombustion chamber 12 is about 900 degreeC, for example.

  The dry stoker 13, the combustion stoker 14, and the post combustion stoker 15 are arranged in this order from the upstream side in the transport direction at the bottom of the furnace chamber 11 in the incinerator 2. Primary air is supplied to the furnace chamber 11 through the stokers 13 to 15.

  The waste supplied from the inlet 2 a of the incinerator 2 is first sent to the drying stoker 13 and dried by the primary air and the radiant heat of the furnace chamber 11. The waste dried in the dry stoker 13 is sent to the combustion stoker 14 by the dry stoker 13 and burned to generate a flame. Waste in the combustion stoker 14 and ash generated by the combustion are sent to the post-combustion stoker 15 by the combustion stoker 14. In the post-combustion stoker 15, unburned waste that could not be combusted by the combustion stoker 14 is burned, and the ash after combustion of the waste is discharged from a chute 16 provided adjacent to the post-combustion stoker 15. Is done.

  The incinerator 2 of this embodiment is a parallel flow stoker type incinerator in which the direction of transporting waste and the flow direction of gas generated by combustion of waste are parallel. Specifically, the incinerator 2 includes a side wall 11a extending in the vertical direction in which the inlet 2a is formed, and an upper wall 11b that extends from the upper end of the side wall 11a in the transport direction and forms the ceiling of the furnace chamber 11. Have. The upper wall 11b is gently inclined in the transport direction so that the downstream portion is located above the upstream portion in the transport direction. At the downstream end of the upper wall 11b of the furnace chamber 11, an intermediate partition wall 17 extending obliquely downward in the transport direction is provided. The intermediate partition wall 17 partitions the upper space S of the furnace chamber 11 and the recombustion chamber 12 so as to be divided in the transport direction. For this reason, the gas generated by the combustion of the waste basically flows to the downstream end of the furnace chamber 11 and then enters the recombustion chamber 12.

  The furnace chamber 11 is provided with a furnace partition wall 18 extending vertically downward from the upper wall 11b. The furnace partition wall 18 partitions the upper space S of the furnace chamber 11 into an upstream space S1 and a downstream space S2 in the transport direction. The upstream space S1 is formed as a space where gas temporarily stays between the side wall 11a and the furnace partition wall 18 in the transport direction, and the downstream space S2 is formed between the furnace partition wall 18 and the intermediate partition wall 17 in the transport direction. It is formed as a space where gas temporarily stays between.

  The furnace partition wall 18 is disposed in the vicinity of the upper portion of the boundary between the dry stoker 13 and the combustion stoker 14 in the transport direction. That is, since the upstream space S1 is located above the drying stoker 13, most of the ammonia gas generated when the waste is dried by the drying stoker 13 is collected in the upstream space S1. The gas in the upstream space S1 passes under the lower end portion of the furnace partition wall 18 and enters the downstream space S2 or is discharged from a gas discharge path 31 described later.

  A plurality of secondary air supply ports 21 are provided in the upper wall 11b of the furnace chamber 11 (more specifically, a location located above the downstream space S2 of the upper wall 11b) and the intermediate partition wall 17. Secondary air is supplied to the downstream space S2. The furnace chamber 11 is provided with a plurality of exhaust gas supply ports 22 for supplying exhaust gas discharged from the incinerator 2. Since the oxygen concentration is lower than that of air, the exhaust gas is supplied to the furnace chamber 11 in order to suppress a local excessive increase in the combustion temperature. For example, a part of the exhaust gas that has passed through a boiler (not shown) provided downstream of the recombustion chamber 12 is returned to the furnace chamber 11 via the exhaust gas supply port 22.

  The denitration system 3A reduces nitrogen oxides (NOx) in the exhaust gas discharged from the incinerator 2. “Denitration” refers to detoxification by reacting nitrogen oxide (NOx) in a gas with a reducing gas. The denitration system 3 </ b> A includes a gas discharge path 31, a cleaning tower 32, a control device 33, a gas return path 34, and a non-catalytic denitration apparatus 35.

  The gas discharge path 31 is a flow path for discharging a part of the gas in the upstream space S <b> 1 of the furnace chamber 11 and supplying the gas to the cleaning tower 32. The upstream end of the gas discharge path 31 is connected to the upper wall 11 b facing the upstream space S <b> 1 in the furnace chamber 11. A blower 31 a is provided in the middle of the gas discharge path 31. The gas in the upstream space S <b> 1 of the furnace chamber 11 is attracted by the blower 31 a and guided to the cleaning tower 32 through the gas discharge path 31.

  The cleaning tower 32 brings ammonia gas contained in the gas supplied from the gas discharge path 31 into contact with water to generate ammonia water. The cleaning tower 32 includes a tower body 41 having an internal space extending in the vertical direction. The tower body 41 is provided with an unillustrated replenishment water port. Then, water is supplied to the internal space of the tower main body 41 from the replenishing water port, and stored in the bottom of the tower main body 41.

  The downstream end of the gas discharge path 31 is connected to the side wall of the tower body 41. The gas discharged from the upstream space S1 through the gas discharge path 31 is supplied to the gas phase inside the tower main body 41 (above the upper surface of the water stored in the bottom of the tower main body 41).

  The water stored at the bottom of the tower body 41 is circulated so that the water is once discharged to the outside of the tower body 41 through the circulation path 42 and introduced into the tower body 41 again. The upstream end of the circulation path 42 is connected to the bottom of the tower main body 41, and the downstream end of the circulation path 42 is connected to the top of the tower main body 41.

  In the middle of the circulation path 42, a circulation pump 43 is provided. The operation of the circulation pump 43 is controlled by the control device 33. A discharge portion 44 is provided at the downstream end of the circulation path 42. The discharge part 44 is located above the downstream end part of the gas discharge path 31. The discharge part 44 is, for example, a shower nozzle.

  When the circulation pump 43 is operated by the control device 33, the water stored at the bottom of the tower body 41 is sent to the discharge section 44 through the circulation path 42 and discharged, and then the inside of the tower body 41 is discharged. Descend. On the other hand, the gas supplied from the downstream end of the gas discharge passage 31 rises inside the tower body 41 and comes into contact with the water that is discharged from the discharge portion 44 and descends. The falling water contacts and absorbs the ammonia gas contained in the gas, and falls into the water stored at the bottom of the tower body 41. Thus, the water stored in the bottom of the tower main body 41 circulates, whereby the ammonia gas in the gas supplied from the downstream end of the gas discharge path 31 is recovered, and the water stored in the bottom of the tower main body 41 is recovered. The ammonia concentration of (ie, ammonia water) increases.

  The gas return path 34 is a flow path for returning the gas discharged from the upstream space S <b> 1 in the furnace chamber 11 to the downstream space S <b> 2 in the furnace chamber 11 after supplying the gas to the cleaning tower 32. The upstream end of the gas return path 34 is connected to the top of the tower body 41, and the downstream end of the gas return path 34 is connected to the upper wall 11 b facing the downstream space S <b> 2 in the furnace chamber 11. ing. The gas rising inside the tower main body 41 comes into contact with the descending water, and then is sent to the downstream space S2 through the gas return path 34.

  The non-catalytic denitration device 35 is a device that blows ammonia water generated in the cleaning tower 32 into the recombustion chamber 12 as a denitration chemical. The non-catalytic denitration device 35 includes a storage tank 51 and a dilution device 52.

  The storage tank 51 is a tank that stores ammonia water having a predetermined concentration (for example, an ammonia concentration of 25%). The storage tank 51 is supplied with ammonia water as a purchased product having a predetermined concentration from a supply port (not shown) and stored. Further, ammonia water is also supplied to the storage tank 51 from the cleaning tower 32 through the first ammonia water supply path 53. The first ammonia water supply path 53 is provided with a discharge pump 53 a whose operation is controlled by the control device 33. When the discharge pump 53 a is operated by the control device 33, the ammonia water stored at the bottom of the tower body 41 is supplied to the storage tank 51 through the first ammonia water supply path 53.

  Here, an example of control by the control device 33 will be described. The tower body 41 is provided with a concentration meter 45 that detects the ammonia concentration of the ammonia water stored at the bottom of the tower body 41. The ammonia concentration detected by the densitometer 45 is sent to the control device 33.

  The control device 33 operates the circulation pump 43 until the ammonia concentration detected by the concentration meter 45 reaches a predetermined ammonia concentration set for the storage tank 51 (for example, ammonia concentration 25%). Then, the discharge pump 53a is stopped. As described above, the ammonia concentration of the ammonia water stored at the bottom of the tower body 41 increases as it circulates through the circulation path 42.

  Then, when the ammonia concentration detected by the concentration meter 45 reaches the ammonia concentration set for the storage tank 51, the control device 33 stops the circulation pump 43 and operates the discharge pump 53a. . In this way, part or all of the ammonia water generated in the cleaning tower 32 is supplied to the storage tank 51 via the first ammonia water supply path 53. Thereafter, the control device 33 stops the discharge pump 53a, and then replenishes water into the tower main body 41 and operates the circulation pump 43.

  Note that the control by the control device 33 is not limited to that described above. For example, instead of controlling the discharge pump 53a, the control device 33 controls an unillustrated on-off valve provided in the first ammonia water supply path 53, thereby allowing the cleaning tower to pass through the first ammonia water supply path 53. Ammonia water may be supplied from 32 to the storage tank 51.

  The ammonia water stored in the storage tank 51 is guided to the diluting device 52 through the second ammonia water supply path 54. The diluting device 52 dilutes the ammonia water supplied from the storage tank 51 to a concentration (for example, ammonia concentration 2%) suitable for blowing into the recombustion chamber 12 as a denitration agent. For example, the diluting device 52 includes a pump that supplies ammonia water from the storage tank 51 to the diluting device 52, a flow rate control valve that controls the flow rate of ammonia water that is supplied to the diluting device 52, and ammonia that is supplied to the diluting device 52. It is a structure which has a mixer etc. which mix water with the dilution water supplied from the outside.

  Ammonia water diluted by the diluting device 52 is supplied to the re-combustion chamber 12 as a denitration drug through a denitration drug supply path 55. For example, the denitration drug supply path 55 has a plurality of branch paths (not shown) that branch in the middle, and is guided by the denitration drug supply path 55 from the spray nozzle provided at the downstream end of each branch path. Ammonia water is blown into the recombustion chamber 12.

  As described above, in the waste incineration facility 1A according to this embodiment, the gas containing ammonia gas is discharged from the furnace chamber 11 through the gas discharge passage 31, and the ammonia gas contained in the discharged gas is recycled. It is used as a denitration chemical blown into the combustion chamber 12. For this reason, compared with the conventional incineration equipment which only removes ammonia gas from the furnace chamber 11, the discharge | emission amount of nitrogen oxide can be suppressed more.

  In the present embodiment, the furnace partition wall 18 partitions the upper space S of the furnace chamber 11 into an upstream space S1 and a downstream space S2 in the transport direction, and the gas discharge path 31 is an upstream space in the furnace chamber 11. Gas is discharged from S1. For this reason, most of the ammonia gas generated when the waste is dried by the dry stoker 13 that is the upstream stoker rises to the upstream space S <b> 1 of the furnace chamber 11. For this reason, the concentration of ammonia gas in the gas discharged through the gas discharge path 31 is set to a higher state than when the gas is discharged from the entire upper space S of the furnace chamber 11, and the furnace chamber 11 is efficiently removed. Ammonia gas can be removed.

  In the present embodiment, the gas in the upstream space S1 of the furnace chamber 11 discharged through the gas discharge path 31 is removed from the ammonia gas in the gas by the cleaning tower 32 and then passed through the gas return path 34. Thus, it can be returned to the downstream space S2 of the furnace chamber 11. Thereby, the unburned gas (carbon monoxide etc.) contained in the gas of the upstream space S1 of the furnace chamber 11 can be returned to the downstream space S2 of the furnace chamber 11 and burned. When the gas in the upstream space S1 of the furnace chamber 11 contains a reducing gas (such as hydrogen cyanide) other than ammonia gas, the reducing gas is used for the denitration reaction with nitrogen oxides in the furnace chamber 11. can do.

  In the present embodiment, the downstream space S2 of the furnace chamber 11 is sandwiched between the furnace partition wall 18 and the intermediate partition wall 17, thereby forming a space in which gas can stay. For this reason, the combustion reaction of the unburned gas contained in the gas returned by the gas return path 34 can be made easier to occur, and a reducing gas other than ammonia gas can be added to the gas returned by the gas return path 34. When it is contained, the denitration reaction between the reducing gas and nitrogen oxide can be more easily generated.

(Second Embodiment)
Next, the waste incineration facility 1B according to the second embodiment will be described with reference to FIG. FIG. 2 is a diagram illustrating a configuration of a waste incineration facility 1B according to the second embodiment. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The present embodiment is common to the first embodiment in that a part of the gas in the upstream space S1 of the furnace chamber 11 is discharged. However, instead of supplying the discharged gas to the cleaning tower 32, the recombustion chamber is used as it is. 12 is different from the first embodiment in that it is supplied to 12.

  Specifically, the waste incineration facility 1B, as the denitration system 3B, discharges part of the gas in the upstream space S1 of the furnace chamber 11 and recombusts while maintaining the concentration of ammonia gas in the discharged gas. A gas passage 61 for supplying the chamber 12 is provided. The upstream end of the gas passage 61 is connected to the upper wall 11 b facing the upstream space S <b> 1 in the furnace chamber 11, and a blower 61 a is provided in the middle of the gas passage 61. The downstream end of the gas passage 61 is connected to the side wall of the recombustion chamber 12. The gas in the upstream space S <b> 1 of the furnace chamber 11 is attracted by the blower 61 a and guided to the recombustion chamber 12 through the gas passage 61.

  By the way, ammonia tends to be converted into nitrogen oxides at a high temperature range of 1000 ° C. or higher, but tends to contribute to the reduction of nitrogen oxides near 900 ° C. In the present embodiment, the furnace partition wall 18 collects most of the ammonia gas generated when the waste is dried by the drying stalker 13 which is an upstream stalker into the upstream space S1 of the furnace chamber 11, and the gas passage. The gas in the upstream space S <b> 1 is discharged through 61. Thereby, ammonia gas oxidized in the local high temperature region of the furnace chamber 11 is reduced, and generation of nitrogen oxides in the furnace chamber 11 can be suppressed.

  Further, for the nitrogen oxide generated in the furnace chamber 11 in a small amount, the gas discharged from the upstream space S1 through the gas passage 61 is recombusted at a relatively low temperature compared to the furnace chamber 11. 12 is supplied. Thus, the ammonia gas in the gas supplied through the gas passage 61 (that is, the gas in the upstream space S1 of the furnace chamber 11) can be used for the denitration reaction of nitrogen oxides in the recombustion chamber 12. it can. For this reason, compared with the conventional incinerator which only removes ammonia gas from the furnace chamber 11, discharge | emission amount of nitrogen oxide (NOx) can be suppressed more.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, in the first and second embodiments described above, the incinerator 2 is a parallel flow incinerator, but the incinerator of the present invention is not limited to this. For example, the incinerator may not be provided with the intermediate partition wall 17, for example, an intermediate-flow incinerator in which gas generated by combustion of waste flows in a different direction with respect to the direction in which the waste is conveyed. Also good.

  In the first and second embodiments described above, the furnace partition wall 18 has been described as extending vertically downward, but the furnace partition wall of the present invention is not limited to this. For example, the furnace partition wall may extend obliquely with respect to the vertical direction so as to go upstream or downstream in the transport direction as it goes downward. Further, the furnace partition wall may not be located above the boundary between the drying stoker 13 and the combustion stoker 14, and may be disposed downstream or upstream in the transport direction from the boundary. In the first embodiment, the furnace partition wall 18 may not be provided.

  Moreover, the connection location of the upstream end part and the downstream end part of the gas return path of the present invention is not limited to that described in the first embodiment. For example, the upstream end of the gas return path may be connected to the side wall of the tower body 41, and the downstream end of the gas return path is the side wall of the furnace chamber 11 facing the downstream space S2. Or may be connected to the intermediate partition wall 17. Further, the downstream end of the gas return path may be connected to the recombustion chamber 12.

  In addition, the passage through which gas such as the gas discharge passage 31 and the gas passage 61 described above and the passage through which ammonia water passes through such as the denitration chemical supply passage 55 may be configured by a single pipe. It may be configured by a pipe line or may be branched in the middle. In addition, an opening / closing valve and / or a flow rate control valve may be appropriately provided in these passages.

  The cleaning tower 32 is not limited to the one described in the first embodiment, and any cleaning tower 32 may be used as long as it absorbs the ammonia in the gas discharged through the gas discharge path through gas-liquid contact. For example, the cleaning tower 32 may be configured to eject the gas supplied from the gas discharge path 31 into the water stored in the tower main body 41. In this case, the tower main body 41 extends in the vertical direction. It does not have to have a space.

  In the first embodiment, the non-catalytic denitration apparatus 35 includes the storage tank 51 and the dilution apparatus 52. However, the non-catalytic denitration apparatus of the present invention is not limited to this. For example, the non-catalytic denitration device may not include the storage tank 51 and the diluting device 52. For example, the upstream end portion of the denitration chemical supply path 55 may be directly connected to the cleaning tower 32. In this case, the denitration chemical supply path 55 and the spray nozzle at the downstream end thereof correspond to the non-catalytic denitration apparatus of the present invention. Further, the control device 33 supplies the denitration chemical when the ammonia concentration detected by the densitometer 45 becomes an ammonia concentration suitable for blowing into the recombustion chamber 12 as a denitration chemical (for example, ammonia concentration 2%). Ammonia water may be supplied from the cleaning tower 32 to the recombustion chamber 12 via the passage 55.

  Further, the waste incineration facility 1B of the second embodiment may further include a non-catalytic denitration device that blows ammonia water into the recombustion chamber 12 as a denitration chemical. In this case, compared with the waste incineration equipment provided with the conventional non-catalytic denitration apparatus, the denitration chemical blown by the non-catalytic denitration apparatus can be saved.

1A, 1B: Waste incineration equipment 2: Incinerator 11: Furnace chamber 12: Recombustion chamber 13: Dry stoker 14: Combustion stoker 17: Intermediate partition wall 18: Furnace partition wall 31: Gas discharge channel 32: Cleaning tower 34: Gas return path 35: Non-catalytic denitration device 61: Gas path

Claims (5)

A furnace chamber for combusting waste, a recombustion chamber for combusting combustion gas generated by combustion of waste in the furnace chamber, and a waste arrayed in a waste transport direction at the bottom of the furnace chamber. An incinerator having a drying stoker for drying and a combustion stoker for burning waste;
A gas discharge passage for discharging a part of the gas in the upper space of the furnace chamber;
A cleaning tower for producing ammonia water by bringing ammonia gas contained in the gas discharged through the gas discharge path into contact with water;
A waste incineration facility comprising: a non-catalytic denitration device that blows ammonia water generated in the cleaning tower into the re-combustion chamber as a denitration agent. The furnace chamber is provided with a furnace partition wall that extends downward from the upper wall of the furnace chamber and partitions the upper space of the furnace chamber into an upstream space and a downstream space in the transport direction,
The waste incineration facility according to claim 1, wherein the gas discharge path discharges gas from the upstream space in the furnace chamber.   The waste incineration equipment according to claim 2 provided with a gas return way connected from said washing tower to said downstream space in said furnace room.   The incinerator includes an intermediate partition wall that extends downward from a downstream end of the upper wall of the furnace chamber and partitions the downstream space and the recombustion chamber in the furnace chamber so as to be divided in the transport direction. The waste incineration facility according to claim 3. A furnace chamber for combusting waste, a recombustion chamber for combusting combustion gas generated by combustion of waste in the furnace chamber, and a waste arrayed in a waste transport direction at the bottom of the furnace chamber. A drying stoker for drying, a combustion stoker for burning waste, and a furnace partition wall extending downward from the upper wall of the furnace chamber and partitioning the upper space of the furnace chamber into an upstream space and a downstream space in the transport direction An incinerator having,
A waste incineration facility, comprising: a gas passage for discharging a part of the gas in the upstream space of the furnace chamber and supplying the reburning chamber with a concentration of ammonia gas in the discharged gas.

Images