JP6021603B2 - Incineration equipment - Google Patents

Description

  The present invention relates to an incineration facility.

  For example, a stoker-type incineration facility for incinerating incineration materials such as municipal waste is a hopper that temporarily stores the incineration material, and incineration that is continuously supplied from the hopper through the chute to the feed table. A feeder that moves the object forward and backward with a predetermined stroke and pushes it into the incinerator, and a movable fire that reciprocates in the direction of dust flow with a metal fixed grate on the bottom side of the incinerator (combustion gas flow path) A stoker (combustion unit) formed by alternately arranging lattices and a wind box (primary combustion air supply unit) provided below the stoker and for supplying primary combustion air to each part of the stoker are configured. Yes.

  Also, in this type of incineration equipment, the stoker in the incinerator receives the incinerated material that has been pushed out by the feeder and dropped into the incinerator, evaporates the moisture of the incinerated material, and partially decomposes it. The primary combustion air supplied from the dry stoker unit and the lower air box ignites the incinerated material dried in the dry stoker unit, and combusts the volatile component and fixed carbon component, and burns in the combustion stoker unit. And a post-combustion stoker section that burns unburned components such as fixed carbon components that have passed through the ash until they completely become ash. In addition, a dry stoker part, a combustion stoker part, and a post-combustion stoker part are arranged in order from the upstream end side to the downstream end side in the conveyance direction of the incineration object, and at the outlet of the post-combustion stoker part on the downstream end side in the conveyance direction. An ash outlet is provided, and the ash is discharged from the incinerator through the ash outlet.

  Further, the incinerator has a combustion gas flow path formed therein, a combustion gas flow path above the stoker is a primary combustion chamber, and a further upper side of the primary combustion chamber is a secondary combustion chamber. The combustion gas generated in the primary combustion chamber is mixed with the secondary combustion air and sent to the secondary combustion chamber, where unburned components in the combustion gas are combusted in the secondary combustion chamber. In addition, a heat recovery boiler is connected to the downstream of the secondary combustion chamber, and is configured to recover and effectively use the exhaust heat of the incinerator. Furthermore, the exhaust gas heat-recovered by the heat recovery boiler is processed through an exhaust gas treatment facility such as a temperature reducing tower and a dust removal device, and discharged from the chimney.

On the other hand, the incineration facility is equipped with a means for supplying denitration chemicals such as ammonia and urea into the exhaust gas in the incinerator (denitration chemical supply unit), so-called non-catalytic denitration system, and incineration by supplying denitration chemicals Some are configured to reduce and detoxify NOx produced in the process and contained in combustion gas (exhaust gas). In addition, for example, when ammonia is used as a denitration agent, NO and NH ₃ generated by burning the incinerated material suitably undergo a reduction reaction in the temperature range of 800 to 1000 ° C., and the incinerated material is sufficient. Therefore, it is necessary to supply a denitration agent to the area after burning. For this reason, in general, this type of incineration equipment is configured to spray and supply the denitration chemical downstream of the secondary combustion air supply port (supply nozzle, secondary combustion air supply unit) in the combustion gas flow direction. (For example, refer to Patent Document 1).

  In the incineration facility, a part of the exhaust gas treated by the exhaust gas treatment facility is extracted as recirculated exhaust gas, and the extracted recirculated exhaust gas is returned to the primary combustion chamber between the secondary combustion air supply port and the stoker. There is something like that. When the recirculated exhaust gas is supplied in this way, the atmosphere of the primary combustion chamber can be changed to a weakly reducing atmosphere, and further, the mixture is stirred and mixed by supplying the recirculated exhaust gas, and the gas concentration and temperature of this part are made uniform. Can do. Thereby, unburned gas components and unburned substances can be completely burned, and generation of NOx can be suppressed.

JP 2009-103381 A

  Here, for example, in the incineration facility disclosed in Patent Document 1, the temperature distribution in the incinerator is estimated by measurement or simulation, and the denitration drug is sprayed in a temperature range of 800 to 1000 ° C. For this reason, it is necessary to incorporate a temperature distribution measuring means and a simulation device in the incinerator (combustion gas flow path), resulting in a complicated and expensive device configuration.

  An incineration facility according to the present invention includes a combustion section that burns while conveying an incinerated object, a combustion gas passage that guides combustion gas generated when the incinerated object burns, and primary combustion with respect to the combustion section A primary combustion air supply section for supplying air, a secondary combustion air supply section for supplying secondary combustion air to the combustion gas flow path, and after processing the combustion gas flowing through the combustion gas flow path A recirculated exhaust gas supply unit that recirculates exhaust gas to the combustion gas flow path between the primary combustion air supply unit and the secondary combustion air supply unit and supplies the exhaust gas as recirculated exhaust gas; and the secondary combustion air supply unit; And a first denitration chemical supply unit that supplies a denitration chemical to the combustion gas flow path between the recirculation exhaust gas supply units.

  In addition, the incineration facility of the present invention preferably includes a second denitration chemical supply unit that supplies a denitration chemical downstream of the secondary combustion air supply unit in the flow direction of the combustion gas.

  Further, in the incineration facility of the present invention, the internal combustion gas is extracted between the combustion section and the first denitration chemical supply section and on the downstream end side of the combustion section in the conveying direction of the incinerated object, and the secondary combustion air supply It is more preferable to provide an internal gas extraction supply section that supplies the combustion gas flow path together with the secondary combustion air from the section.

  In the incineration facility of the present invention, a part of the exhaust gas treated in the exhaust gas treatment facility is recirculated to the combustion gas flow path (primary combustion chamber) between the primary combustion air supply unit and the secondary combustion air supply unit. By doing so, the combustion gas of this part can be stirred and mixed by the recirculated exhaust gas, and the concentration and temperature of the gas component can be made uniform.

  Then, the secondary combustion air supply unit and the recirculated exhaust gas that are stirred and mixed by supplying the recirculated exhaust gas as described above and made uniform at, for example, a temperature of about 950 to 1000 ° C. and an oxygen concentration of about 1 to 2 vol% or less. When the denitration drug is supplied from the first denitration drug supply unit between the supply units, it becomes possible to reduce NOx efficiently and effectively in a short time, and achieve a high denitration rate exceeding 70%, for example. It becomes possible.

  Therefore, according to the incineration facility of the present invention, it is not necessary to incorporate a temperature distribution measuring means or a simulation device in the incinerator as in the prior art, a recirculation exhaust gas supply unit is provided, and a secondary combustion air supply unit is provided. By providing the first denitration chemical supply unit that supplies the denitration chemical between the recirculation exhaust gas supply units, it becomes possible to reduce NOx efficiently and effectively.

It is a figure which shows the incineration equipment which concerns on one Embodiment of this invention. It is a figure which shows the relationship between the combustion gas temperature by the difference in the oxygen concentration of combustion gas, and a NOx removal rate. It is a figure which shows the example of a change of the incineration equipment which concerns on one Embodiment of this invention.

  Hereinafter, with reference to FIG.1 and FIG.2, the incineration equipment which concerns on one Embodiment of this invention is demonstrated. In addition, this embodiment is related with the incineration equipment for incinerating to-be-incinerated objects, such as municipal waste.

  As shown in FIG. 1, the incineration facility (incineration plant) A of the present embodiment includes a hopper (hopper chute) 2 for temporarily storing the incinerator 1, an incinerator 3 for burning the incinerator 1, and A feeder 5 that continuously feeds the incinerator 1 supplied from the hopper 2 through the chute 2a onto the feed table 4 with a predetermined stroke and pushes it into the incinerator 3, and feeds the feeder 5 onto the feed table 4. , A feeder drive device 6 for moving forward and backward, a stoker 7 in which a metal fixed grate and a movable grate reciprocating in the direction of dust flow are alternately arranged on the bottom side of the incinerator 3, and a blower The primary combustion air supply unit 10 is configured to supply the primary combustion air S1 from 8 to each part of the stoker 7 through the wind box 9.

  The stoker 7 is a combustion section according to the present invention. The stoker 7 receives the incinerated object 1 that has been pushed out by the feeder 5 and dropped into the incinerator 3, evaporates the moisture of the incinerated object 1, and partially pyrolyzes it. Combustion stoker that ignites the incinerated object 1 dried in the dry stoker part M1 by the dry stoker part M1 and the primary combustion air S1 supplied from the lower wind box 9 and burns volatile matter and fixed carbon content Part M2, and a post-combustion stoker part M3 that burns unburned components such as fixed carbon that have passed without being burned in the combustion stoker part M2 until they completely become ash. Further, an ash outlet 11 is provided at the outlet of the post-combustion stoker M 3, and the ash is discharged from the incinerator 3 through the ash outlet 11.

  The interior of the incinerator 3 is a combustion gas flow path 12. Further, in the incinerator 3 of the combustion gas flow path 12, the upper side of the stoker 7 is the primary combustion chamber 13 and the upper side of the primary combustion chamber 13 is the secondary. Combustion gas R flows from the stoker 7 toward the primary combustion chamber 13 and from the primary combustion chamber 13 to the secondary combustion chamber 14 from below to above. Further, a heat recovery boiler 15 is connected to the incinerator 3 on the downstream side in the flow direction of the combustion gas R in the secondary combustion chamber 14. Further, the incinerator 3 is provided with a secondary combustion air supply unit 18 for supplying the secondary combustion air S2 from the blower (not shown) to the combustion gas passage 12 through a supply nozzle 17 attached to the furnace wall of the incinerator 3. It has been.

  Further, the exhaust gas R ′ heat recovered by the heat recovery boiler 15 is processed through an exhaust gas processing facility 21 such as a temperature reducing tower 19 and a dust removing device (bag filter) 20, and is discharged from the chimney 22 to the outside.

  Furthermore, in the incineration facility A of the present embodiment, the exhaust gas R ′ after being treated by the exhaust gas treatment facility 21 is treated with the combustion gas flow path 12 between the primary combustion air supply unit 10 and the secondary combustion air supply unit 18, that is, A recirculated exhaust gas supply unit 25 is provided which is recirculated to the primary combustion chamber 13 by a blower 23 and supplied as recirculated exhaust gas S3 through a supply nozzle 24 provided on the furnace wall.

  Furthermore, a first denitration chemical supply unit 26 that supplies the denitration chemical P1 to the combustion gas passage 12 (primary combustion chamber 13) between the secondary combustion air supply unit 18 and the recirculation exhaust gas supply unit 25 is provided. Further, a second denitration chemical supply unit 27 that supplies the denitration chemical P2 to the downstream side (secondary combustion chamber 14) in the flow direction of the combustion gas R from the secondary combustion air supply unit 18 is provided. Further, the first denitration drug supply unit 26 and the second denitration drug supply unit 27 are respectively a storage tank (not shown) of a denitration drug P1, P2 such as ammonia water or urea water, a liquid feed pump (not shown), a furnace wall. The supply nozzles 30 and 31 are provided.

  When the incineration object 1 is incinerated with the incineration facility A of the present embodiment having the above-described configuration, the incineration object 1 that has fallen on the stalker 7 in the incinerator 3 by driving the feeder 5 is grate. Are sequentially conveyed to the dry stoker part M1, the combustion stoker part M2, and the post-combustion stoker part M3. At this time, the primary combustion air S1 is supplied from the lower wind box 9 to each of the stoker parts M1, M2, M3 with an air ratio of about 0.8 to 1.0, for example, and incinerated by the primary combustion air S1. Object 1 burns. Further, the incineration object 1 burns while being sequentially conveyed, and ash is discharged to the outside from an ash outlet 11 provided at the outlet of the post-combustion stoker M3.

  Here, the flow rate of the primary combustion air S1 supplied from below to the incineration object 1 on the grate of the stoker 7 reciprocating and combusting the incineration object 1 is not so high. In addition, the combustion gas R generated by burning the incineration object 1 with the primary combustion air S1 is distributed in the concentration and temperature of the gas component in the primary combustion chamber 13. For this reason, it takes time to mix the primary combustion air S1 and the combustion gas R, and it takes time until the components are completely combusted.

  For this reason, in the incineration facility A of the present embodiment, the combustion gas R flowing upward from the primary combustion chamber 13 in the incinerator 3 in the middle of the combustion gas flow path 12 of the incinerator 3 in the same manner as in the past. The next combustion air S2 is supplied, for example, at an air ratio of about 0.2 to 0.4, and combustion of the unburned gas component of the combustion gas R is promoted.

  On the other hand, in the process of burning the incinerated object 1 as described above, NOx is generated with the generation and combustion of unburned gas and unburned object, and in particular the primary after incinerated object 1 is incinerated with the primary combustion air S1. Many occur in the combustion chamber 13.

  On the other hand, in the incineration facility A of the present embodiment, first, it is sent from the incinerator 3 to the heat recovery boiler 15 and is recovered by the heat recovery boiler 15, and further the temperature reducing tower 19 of the exhaust gas treatment facility 21, the dust removing device. A part of the exhaust gas R ′ that has been sequentially processed at 20 or the like, for example, about 10 to 30% of the total exhaust gas amount is used as the recirculated exhaust gas S3 in the primary combustion air supply unit 10 and the secondary combustion air supply unit 18. It is made to recirculate | reflux to the combustion gas flow path 12 in the meantime, ie, the primary combustion chamber 13. FIG. When the recirculated exhaust gas S3 is supplied to the primary combustion chamber 13 in this way, the combustion gas R in the primary combustion chamber 13 is agitated and mixed by the recirculated exhaust gas S3. Thereby, the density | concentration and temperature of the gas component in the primary combustion chamber 13 are equalize | homogenized, and combustion of unburned gas and an unburned substance is accelerated | stimulated in a reducing atmosphere, and generation | occurrence | production of NOx is suppressed in connection with this.

  Although it is conceivable to supply fresh air to the primary combustion chamber 13 and stir and mix the combustion gas R in the primary combustion chamber 13, NOx is likely to be generated by the components in the fresh air.

  Next, in the incineration facility A of this embodiment, denitration chemicals P1 and P2 such as ammonia water and urea water are supplied from the denitration chemical supply units 26 and 27 into the combustion gas R in the incinerator 3. When the denitration chemicals P1 and P2 are supplied in this way, a reduction reaction occurs in NOx produced in the incineration process and contained in the combustion gas R (exhaust gas R '), and NOx in the exhaust gas R' is reduced.

  Here, the inventors of the present application have made various studies on the NOx reduction effect of the denitration agents P1 and P2, and obtained knowledge about the relationship between the combustion gas temperature and the denitration rate due to the difference in oxygen concentration in the combustion gas R shown in FIG. I was able to obtain it as a result. That is, as shown in FIG. 2, the lower the oxygen concentration of the combustion gas R, the higher the denitration rate, and it was confirmed that NOx can be efficiently reduced by the supplied denitration chemicals P1 and P2. Furthermore, even in a high temperature range exceeding 900 ° C., it was confirmed that the NOx removal rate increased as the oxygen concentration of the combustion gas R decreased.

  The inventors of the present application who have obtained this knowledge investigate the temperature and oxygen concentration in the incinerator 3 of the incineration facility A of the present embodiment, and the secondary combustion chamber 14 on the downstream side of the secondary combustion air supply unit 18. The oxygen concentration of the combustion gas R in the case of the dry base is about 5-6 vol%, and the oxygen concentration of the combustion gas R in the primary combustion chamber 13 between the secondary combustion air supply unit 18 and the recirculation exhaust gas supply unit 25 is dry base. It confirmed that 3 vol% or less was shown.

  Based on this knowledge, in the incineration facility A of the present embodiment, first, the first denitration agent P1 that supplies the denitration agent P1 to the primary combustion chamber 13 between the secondary combustion air supply unit 18 and the recirculation exhaust gas supply unit 25. A supply unit 26 is provided. That is, the recirculated exhaust gas S3 is supplied between the secondary combustion air supply unit 18 and the recirculated exhaust gas supply unit 25, and the concentration and temperature of the gas components are made uniform by stirring and mixing, and combustion is thereby promoted. For example, homogenization is performed at a temperature of about 950 to 1000 ° C. and an oxygen concentration of about 1 to 2 vol%. Further, the supply of the recirculated exhaust gas S3 forms a wide range of this temperature and oxygen concentration.

  Therefore, when the denitration chemical P1 is supplied from the first denitration chemical supply unit 26 between the secondary combustion air supply unit 18 and the recirculated exhaust gas supply unit 25, as shown in FIG. A denitration reaction occurs at a high rate, and NOx is efficiently and effectively reduced in a short time.

  Furthermore, the incineration facility A of the present embodiment includes a second denitration chemical supply unit 27 that supplies the denitration chemical P2 downstream of the secondary combustion air supply unit 18 in the flow direction of the combustion gas R. The denitration agent P2 is also supplied to the secondary combustion chamber 14. In the secondary combustion chamber 14, the oxygen concentration is about 5 to 6 vol% at a temperature of about 850 to 950 ° C. and the supply of the secondary combustion air S 2, so that as shown in FIG. The denitration reaction occurs with the above denitration efficiency.

  At this time, in the incineration facility A of the present embodiment, the denitration agent P1 is supplied from the first denitration agent supply unit 26, and the combustion gas R in which NOx is already reduced at a denitration rate exceeding 70% circulates. By supplying the denitration chemical P2 from the second denitration chemical supply unit 27 to the combustion gas R, NOx is further reduced with a denitration efficiency of 50% or more. For this reason, in the present embodiment, in addition to efficient NOx reduction by the first denitration drug supply unit 26, two-stage denitration processing for further reducing NOx by the second denitration drug supply unit 27 is performed. Thus, NOx in the combustion gas R (exhaust gas R ′) is surely suppressed to a low concentration.

  In addition, when the denitration agent P2 is supplied only to the secondary combustion chamber 14 as in the prior art, if the input amount of the denitration agent P2 such as ammonia is increased, the unreacted denitration agent P2 is generated. It will leak to the outside together with the exhaust gas R ′. For this reason, conventionally, it has been necessary to limit the input amount of the denitration drug P2.

  In contrast, in the incineration facility A of the present embodiment, the first denitration chemical supply unit 26 supplies the denitration chemical P1 to the primary combustion chamber 13 between the secondary combustion air supply unit 18 and the recirculation exhaust gas supply unit 25. In other words, since the denitration drug P1 is supplied to a high temperature field of about 1000 ° C., no reaction occurs even if a large amount of the denitration drug P1 is added. Thereby, in the incineration facility A of the present embodiment, it is not necessary to suppress the input amount of the denitration agent P1 in order to prevent leakage as in the prior art, and it is possible to introduce more denitration agent P1 than before. From this point, the NOx reduction effect is surely obtained.

  Therefore, in the incineration facility A of the present embodiment, combustion between the primary combustion air supply unit 10 and the secondary combustion air supply unit 18 uses a part of the exhaust gas R ′ treated by the exhaust gas treatment facility 21 as the recirculated exhaust gas S3. By recirculating to the gas flow path 12, that is, the primary combustion chamber 13, the combustion gas R in the primary combustion chamber 13 can be agitated and mixed by the recirculated exhaust gas S 3, and thereby the gas components in the primary combustion chamber 13 can be mixed. The concentration and temperature can be made uniform.

  In the incineration facility A of the present embodiment, the NOx removal rate increases as the oxygen concentration of the combustion gas R decreases, and the NOx removal rate decreases as the oxygen concentration of the combustion gas R decreases even in a high temperature region exceeding 900 ° C. Based on the knowledge of the inventors of the present application that it becomes higher, the first denitration chemical supply unit 26 supplies the denitration chemical P1 to the primary combustion chamber 13 between the secondary combustion air supply unit 18 and the recirculation exhaust gas supply unit 25. By doing so, NOx can be efficiently and effectively reduced in a short time.

  That is, between the secondary combustion air supply unit 18 and the recirculation exhaust gas supply unit 25 is stirred and mixed by supplying the recirculation exhaust gas S3, and combustion is promoted, for example, at a temperature of about 950 to 1000 ° C. and 1 Since the oxygen concentration is uniform at about ˜2 vol%, the first denitration drug supply unit 26 is provided so as to supply the denitration drug P1 between the secondary combustion air supply unit 18 and the recirculation exhaust gas supply unit 25. Thus, for example, a denitration reaction occurs at a high denitration rate exceeding 70%, and NOx can be efficiently and effectively reduced in a short time.

  Further, when the denitration agent P2 is supplied only downstream of the secondary combustion air supply unit 18 in the flow direction of the combustion gas R (only to the secondary combustion chamber 14) as in the prior art, the unreacted denitration agent P2 is supplied. However, in the incineration facility A of the present embodiment, the secondary combustion air supply unit 18 and the recirculated exhaust gas supply unit are used by the first denitration chemical supply unit 26 in order to prevent the leakage of the NOx removal agent P2. Since the denitration agent P1 is supplied during 25, that is, the denitration agent P1 is supplied to a high temperature field of about 1000 ° C., even if a large amount of the denitration agent P1 is added, it does not react. There is nothing. For this reason, it is possible to introduce a large amount of the denitration agent P1, and also from this point, it is possible to reliably obtain the NOx reduction effect.

  Therefore, according to the incineration facility A of the present embodiment, it is unnecessary to incorporate a temperature distribution measuring means and a simulation device in the incinerator 3 as in the prior art, and in addition to the recirculated exhaust gas supply unit 25, the secondary combustion air It is possible to efficiently and effectively reduce NOx with a simple configuration in which the first denitration drug supply unit 26 that supplies the denitration drug P1 is provided between the supply unit 18 and the recirculation exhaust gas supply unit 25.

  Further, in the incineration facility A of the present embodiment, in addition to the first denitration chemical supply unit 26, the second denitration chemical P2 that supplies the denitration chemical P2 to the downstream side in the flow direction of the combustion gas R from the secondary combustion air supply unit 18. By providing the supply unit 27, the denitration agent P2 is supplied from the second denitration agent supply unit 27 to the combustion gas R in which NOx is reduced by the denitration agent P1 supplied from the first denitration agent supply unit 26, and further the NOx. Can be reduced. That is, in addition to efficiently reducing NOx by the first denitration chemical supply unit 26, and further by performing a two-stage process of reducing NOx by the second denitration chemical supply unit 27, combustion gas is compared with the conventional case. It becomes possible to reliably suppress NOx in R (exhaust gas R ′) to a low concentration.

  As mentioned above, although one embodiment of incineration equipment concerning the present invention was described, the present invention is not limited to the above-mentioned one embodiment, and can be suitably changed in the range which does not deviate from the meaning.

  For example, in this embodiment, the incineration facility A includes the second denitration drug supply unit 27 that supplies the denitration drug P2 downstream from the secondary combustion air supply unit 18 in addition to the first denitration drug supply unit 26. However, the incineration facility according to the present invention is configured so that the denitration drug supply unit 26 supplies the denitration drug P1 only between the secondary combustion air supply unit 18 and the recirculation exhaust gas supply unit 25. In this case, NOx can be reduced sufficiently efficiently and effectively as compared with the conventional case.

  Further, as shown in FIG. 3, the inside of the stoker 7 (combustion unit) 7 and the first denitration chemical supply unit 26 and the downstream side in the conveying direction of the incinerated object 1 of the stoker 7 (in the figure: broken line region G). A part of the gas (combustion gas) S4 may be extracted and provided with an internal gas extraction supply unit 32 that supplies the secondary combustion air supply unit 18 to the combustion gas flow path 12 in the incinerator 3 together with the secondary combustion air S2. Good.

  More specifically, the stoker 7 is provided with a dry stoker part M1, a combustion stoker part M2, and a post-combustion stoker part M3 from the upstream side in the transport direction of the incinerated object 1, and in the post-combustion stoker part M3 on the downstream end side in the transport direction, Since the combustion is completed to some extent, the oxygen of the primary combustion air S1 supplied from the wind box 9 is circulated without being consumed. For this reason, the combustion gas R on the downstream end side in the transport direction of the incinerated object 1 of the stoker 7 has, for example, an oxygen concentration of about 18 to 20 vol%, and the combustion gas in which oxygen is not consumed much (internal gas in the region G). By extracting S4) and supplying it from the secondary combustion air supply unit 18 into the incinerator 3 together with the secondary combustion air S2, it becomes possible to use the oxygen of the internal gas S4 for secondary combustion. Thereby, the amount of fresh air (secondary combustion air S2) supplied from the secondary combustion air supply unit 18 can be reduced, and as a result, the amount of exhaust gas can be reduced. Therefore, it is possible to reduce the load on the exhaust gas treatment facility 21 for treating the exhaust gas R ′.

DESCRIPTION OF SYMBOLS 1 Incinerated object 2 Hopper 2a Chute part 3 Incinerator 4 Feed table 5 Feeder 6 Feeder drive device 7 Stoker 8 Blower 9 Wind box 10 Primary combustion air supply part 11 Ash outlet 12 Combustion gas flow path 13 Primary combustion chamber 14 Secondary Combustion chamber 15 Heat recovery boiler 17 Supply nozzle 18 Secondary combustion air supply unit 19 Temperature reducing tower 20 Dust removal device 21 Exhaust gas treatment equipment 22 Chimney 23 Blower 24 Supply nozzle 25 Recirculation exhaust gas supply unit 26 First denitration chemical supply unit 27 Second Denitration chemical supply unit 30 Supply nozzle 31 Supply nozzle 32 Internal gas extraction supply unit A Incineration facility (incineration plant)
M1 Dry stoker part M2 Combustion stoker part M3 Post combustion stoker part P1 Denitration chemical P2 Denitration chemical R Combustion gas R 'Exhaust gas S1 Primary combustion air S2 Secondary combustion air S3 Recirculation exhaust gas S4 Internal gas

Claims (3)

A combustion section for burning the incinerated material while conveying it;
A combustion gas passage for guiding combustion gas generated by burning the incinerated material to the outside;
A primary combustion air supply unit for supplying primary combustion air to the combustion unit;
A secondary combustion air supply unit for supplying secondary combustion air to the combustion gas flow path;
The exhaust gas after processing the combustion gas flowing through the combustion gas channel is recirculated to the combustion gas channel between the primary combustion air supply unit and the secondary combustion air supply unit and supplied as recirculated exhaust gas A recirculating exhaust gas supply unit,
An incineration facility comprising a first denitration chemical supply unit that supplies a denitration chemical to the combustion gas flow path between the secondary combustion air supply unit and the recirculation exhaust gas supply unit. Incineration equipment according to claim 1,
An incineration facility comprising a second denitration chemical supply unit that supplies a denitration chemical downstream of the secondary combustion air supply unit in the flow direction of the combustion gas. In the incineration facility according to claim 1 or claim 2,
An internal gas is extracted between the combustion unit and the first denitration chemical supply unit and on the downstream end side in the conveyance direction of the incinerated material of the combustion unit, and the combustion is performed together with the secondary combustion air from the secondary combustion air supply unit An incineration facility comprising an internal gas extraction supply unit for supplying to a gas flow path.

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