Crematory denitration device, and method for operating crematory denitration device

Abstract

To improve the performance of removing nitrogen oxides contained in exhaust gas.SOLUTION: A crematory denitration device for removing nitrogen oxides contained in exhaust gas discharged from at least one crematory, comprises: an exhaust gas line in which an exhaust gas flow path for flowing of the exhaust gas is formed; a reducing agent supply device that is disposed in the exhaust gas flow path and supplies a reducing agent for reducing the nitrogen oxides contained in the exhaust gas into the exhaust gas flow path; a catalyst that is disposed on a downstream side of the reducing agent supply device in the exhaust gas flow path and promotes a reaction by the reducing agent; and a duct burner that is disposed on an upstream side of the reducing agent supply device in the exhaust gas flow path and has at least one nozzle for ejecting gas fuel containing hydrogen into the exhaust gas flow path.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a denitration device for a crematorium for removing nitrogen oxides (NOx) contained in exhaust gas discharged from at least one crematorium, and a method for operating the denitration device for a crematorium. [Background technology]

[0002] For example, Patent Document 1 discloses a denitration device for a crematorium that includes a spray nozzle for spraying ammonia water and a catalyst that promotes the reaction of nitrogen oxides in exhaust gas with ammonia, and heats the catalyst with a heating gas for temperature increase that is supplied separately from the exhaust gas. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-220580 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the technology described in Patent Document 1, nitrogen oxides are generated when preparing the heating gas for temperature increase, and there is a risk that the heating gas for temperature increase will contain nitrogen oxides. In this case, nitrogen oxides will be released into the atmosphere until the catalyst reaches a temperature suitable for the reaction of nitrogen oxides.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a denitration device for a crematorium that can improve the performance of removing nitrogen oxides contained in exhaust gas. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the denitration device for a crematorium according to the present disclosure is a denitration device for a crematorium for removing nitrogen oxides contained in exhaust gas discharged from at least one crematorium, and comprises: an exhaust gas line in which an exhaust gas flow path is formed through which the exhaust gas flows; a reducing agent supply device that is disposed in the exhaust gas flow path and supplies a reducing agent that reduces the nitrogen oxides contained in the exhaust gas to the exhaust gas flow path; a catalyst that is disposed downstream of the reducing agent supply device in the exhaust gas flow path and promotes a reaction by the reducing agent; and a duct burner that is disposed upstream of the exhaust gas flow path from the reducing agent supply device and has at least one nozzle that sprays gas fuel containing hydrogen into the exhaust gas flow path. [Effects of the Invention]

[0007] According to the denitration device for crematoriums of the present disclosure, nitrogen oxide removal performance can be improved. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing the schematic configuration of a denitration device for a crematorium according to one embodiment. [Figure 2] 1 is a diagram illustrating a schematic configuration of a duct burner according to an embodiment. [Figure 3] FIG. 2 is a schematic functional block diagram of a control device according to an embodiment. [Figure 4] FIG. 10 is a diagram showing the schematic configuration of a denitration device for a crematorium according to another embodiment. [Figure 5] FIG. 10 is a schematic functional block diagram of a control device according to another embodiment. [Figure 6] 10 is a flowchart of a method for operating a denitration device for a crematorium according to a modified example of an embodiment. [Figure 7] 10 is a flowchart of a method for operating a denitration device for a crematorium according to another modified embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] The following describes a denitration device for a crematorium according to an embodiment of the present disclosure, based on the drawings. This embodiment shows one aspect of the present disclosure, does not limit the disclosure, and can be modified as desired within the scope of the technical concept of the present disclosure.

[0010] (composition) The crematorium denitration device 1 according to the present disclosure removes nitrogen oxides (hereinafter referred to as NOx) contained in exhaust gas G emitted from at least one crematorium 100. Figure 1 is a diagram showing the schematic configuration of the crematorium denitration device 1 according to one embodiment. The crematorium 100 includes a main combustion furnace (not shown) for cremate bodies brought in, and generates exhaust gas G containing NOx when the crematorium 100 is in operation and incinerates the bodies.

[0011] As shown in Figure 1, the crematorium denitration device 1 includes an exhaust gas line 2, a duct burner 4, a reducing agent supply device 6, and a catalyst 8. In the embodiment shown in Figure 1, the crematorium denitration device 1 is configured to remove NOx contained in the exhaust gas G discharged from multiple crematoriums 100. The number of multiple crematoriums 100 is not particularly limited, and may be two, or may be three or more.

[0012] The exhaust gas line 2 has a cylindrical shape, and an exhaust gas flow path 3 is formed inside, through which the exhaust gas G flows. In the present disclosure, the direction in which the exhaust gas flow path 3 extends is referred to as the extension direction D1, the direction toward the inlet of the exhaust gas flow path 3 is referred to as the upstream side of the extension direction D1, and the direction toward the outlet of the exhaust gas flow path 3 is referred to as the downstream side of the extension direction D1. The inlet of the exhaust gas flow path 3 allows the exhaust gas G generated in the crematorium 100 to flow into the exhaust gas flow path 3. The outlet of the exhaust gas flow path 3 may be open to the atmosphere or may be connected to the inside of the chimney. The exhaust gas G flows from the inlet to the outlet of the exhaust gas flow path 3.

[0013] In the embodiment shown in FIG. 1, the exhaust gas flow path 3 includes a junction space 10 located upstream of the duct burner 4 in the extension direction D1. The junction space 10 is configured so that the exhaust gas G discharged from each of the multiple crematoriums 100 flows in and merges. In the embodiment shown in FIG. 1, the exhaust gas flow path 3 includes multiple junction fronts 12 upstream of the junction space 10 in the extension direction D1, through which the exhaust gas G discharged from one crematorium 100 flows. Note that the exhaust gas line 2 is not particularly limited to the embodiment shown in FIG. 1, as long as it is configured so that the combined exhaust gas Gc (G) flows in the junction space 10. For example, the exhaust gas G discharged from each of the multiple crematoriums 100 may be merged before flowing into the exhaust gas line 2. Note that the combined exhaust gas Gc also includes the exhaust gas G when only one crematorium 100 is operating.

[0014] The duct burner 4 is disposed upstream of the reducing agent supply device 6 in the exhaust gas flow path 3. The duct burner 4 includes a nozzle 14 that sprays gaseous fuel F containing hydrogen into the exhaust gas flow path 3. The nozzle 14 is not particularly limited as long as it is configured to spray the gaseous fuel F. For example, the nozzle 14 includes a main hole and a sub-hole that has a smaller diameter than the main hole and is configured to spray the gaseous fuel F at an angle opposite to the central axis of the nozzle 14 relative to the main hole. Note that the duct burner 4 according to one embodiment has multiple nozzles 14 (see FIG. 2). In some embodiments, the duct burner 4 has one nozzle 14.

[0015] In this disclosure, "hydrogen-containing gas fuel F" includes those containing hydrogen and fuels other than hydrogen (mixed combustion) and those containing only hydrogen (monocarbon combustion). Furthermore, even those containing hydrogen and fuels other than hydrogen can be classified as fuels where hydrogen is the main component (volume ratio of hydrogen is 50% or more) and fuels where a fuel other than hydrogen is the main component (volume ratio of hydrogen is less than 50%). "Hydrogen-containing gas fuel F" includes all of these cases.

[0016] The configuration of the duct burner 4 will now be described. Fig. 2 is a diagram schematically showing the configuration of the duct burner 4 according to one embodiment, and is a diagram (front view) of the duct burner 4 as viewed from the downstream side in the extending direction D1 of the exhaust gas passage 3. In one embodiment, the cross-sectional shape of the exhaust gas passage 3 is rectangular.

[0017] In one embodiment, as illustrated in FIG. 2, the duct burner 4 includes a plurality of fuel supply pipes 20 extending through the exhaust gas flow path 3 in the left-right direction D2. The plurality of fuel supply pipes 20 are arranged at intervals from one another in the up-down direction D3. Each of the plurality of fuel supply pipes 20 has a cylindrical shape, and gas fuel F supplied from a supply source 25 flows through the interior of the fuel supply pipes 20. The supply source 25 is, for example, a fuel tank in which the gas fuel F is stored. The nozzle 14 is connected to the fuel supply pipe 20 so as to spray the gas fuel F from the upstream side toward the downstream side in the extension direction D1. In the embodiment illustrated in FIG. 2, a plurality of nozzles 14 are arranged in one fuel supply pipe 20 along the left-right direction D2 (a manifold is formed).

[0018] In the embodiment illustrated in FIG. 2, the duct burner 4 further includes a flame stabilizer 22 having a pair of plate-shaped members 21A and 21B positioned on opposite sides of the nozzle 14. The pair of plate-shaped members 21A and 21B are aligned along the vertical direction D3 and include an upper plate-shaped member 21A and a lower plate-shaped member 21B positioned below the upper plate-shaped member 21A. The upper plate-shaped member 21A and the lower plate-shaped member 21B are connected to a common nozzle 14. The upper plate-shaped member 21A and the lower plate-shaped member 21B are arranged so that they at least partially overlap each other in the horizontal direction D2 when viewed from the front. A plurality of through holes 23 are formed in each of the upper plate-shaped member 21A and the lower plate-shaped member 21B. The upper plate-shaped member 21A and the lower plate-shaped member 21B are spaced apart from the nozzle 14 as they move downstream of the exhaust gas flow path 3 (see FIG. 1). The upper plate-shaped member 21A and the lower plate-shaped member 21B are each symmetrical with respect to the nozzle 14. If flame stabilization is not required, the duct burner 4 does not need to include the flame stabilizer 22.

[0019] 2, multiple nozzles 14 are provided in a row along the left-right direction D2 on one fuel supply pipe 20, but the present disclosure is not limited to this. The duct burner 4 may include a fuel supply pipe 20 extending in the up-down direction D3, and multiple nozzles 14 provided in a row along the up-down direction D3 on the fuel supply pipe 20. In this case, the pair of plate-like members 21A, 21B are disposed on opposite sides of the nozzle 14 in the left-right direction D2.

[0020] In the embodiment illustrated in FIG. 2 , the duct burner 4 further includes an ignition device 24 that ignites the gaseous fuel F. The ignition device 24 is provided in the exhaust gas line 2 and is located downstream of the nozzle 14 in the extension direction D1 of the exhaust gas passage 3. The ignition device 24 may be configured to ignite the gaseous fuel F. For example, pilot ignition, which ignites the gaseous fuel F with a flame formed by a small burner, or direct ignition, which ignites the gaseous fuel F by spark discharge from an ignition plug, may be applied. An ignition device 24 may be provided for each fuel supply pipe 20. The ignition device 24 ignites the gaseous fuel F ejected from an ignition nozzle 27 (14), which is the nozzle 14 arranged closest to the ignition device 24 among the multiple nozzles 14 provided in one fuel supply pipe 20. The flame formed by the ignition nozzle 27 ignites the gaseous fuel F ejected from the nozzle 14 adjacent to the ignition nozzle 27.

[0021] 2, the duct burner 4 further includes a fuel supply line 26 that connects the supply source 25 to each of the plurality of fuel supply pipes 20, and a jet amount adjustment valve 28 that is provided in the fuel supply line 26 and adjusts the amount of gas fuel F supplied to each of the plurality of fuel supply pipes 20. As the opening of the jet amount adjustment valve 28 increases, the amount of gas fuel F supplied to the fuel supply pipe 20 (gas fuel F jetted from the nozzle 14) increases.

[0022] Returning to FIG. 1, the reducing agent supply device 6 and the catalyst 8 will be described. As illustrated in FIG. 1, the reducing agent supply device 6 is disposed downstream of the duct burner 4 in the extension direction D1 of the exhaust gas flow path 3. The reducing agent supply device 6 supplies a reducing agent A that reduces NOx contained in the exhaust gas G to the exhaust gas flow path 3. The reducing agent A is, for example, urea or ammonia, and the reducing agent supply device 6 sprays urea water into the exhaust gas flow path 3. The NOx contained in the exhaust gas G is decomposed into nitrogen and water by a reduction reaction with the reducing agent A. In other words, the NOx contained in the exhaust gas G is reduced.

[0023] The catalyst 8 is disposed downstream of the reducing agent supply device 6 in the extension direction D1 of the exhaust gas flow path 3. The catalyst 8 is configured to promote the reduction of NOx by the reducing agent A, and is made of a metal or metal compound containing, for example, titanium, vanadium, tungsten, or molybdenum.

[0024] In one embodiment, as illustrated in FIG. 1, the denitration device 1 for a crematorium further includes a temperature acquisition device 16 and a control device 18.

[0025] The temperature acquisition device 16 is, for example, a temperature sensor, and acquires an upstream temperature T upstream of the duct burner 4 in the extension direction D1 of the exhaust gas passage 3. The temperature acquisition device 16 is disposed downstream of the junction space 10 in the extension direction D1 of the exhaust gas passage 3 so as to be able to acquire the temperature of the joined exhaust gas Gc.

[0026] The control device 18 controls the operation of the duct burner 4. Such control device 18 is a computer such as an electronic control device, and includes a processor such as a CPU or GPU (not shown), memories such as ROM and RAM, and an I / O interface. The processor of the control device 18 operates (performs calculations, etc.) according to instructions of a program loaded into the memory, thereby realizing each of the functional units of the control device 18. In some embodiments, the control device 18 is a cloud server provided in a cloud environment.

[0027] In one embodiment, the control device 18 is electrically connected to the duct burner 4 and is capable of transmitting a signal S including the amount of gas fuel F to the duct burner 4. Specifically, as shown in Fig. 2, the control device 18 is electrically connected to the ejection amount adjustment valve 28 and is capable of instructing the ejection amount adjustment valve 28 about its opening degree. In one embodiment, the control device 18 is electrically connected to the temperature acquisition device 16 and is capable of acquiring the upstream temperature T.

[0028] 3 is a schematic functional block diagram of the control device 18 according to one embodiment. As illustrated in FIG. 3, the control device 18 includes an upstream temperature acquisition unit 50 and an ejection amount adjustment unit 52. The upstream temperature acquisition unit 50 acquires the upstream temperature T from the temperature acquisition device 16.

[0029] The injection amount adjustment unit 52 adjusts the amount of gaseous fuel F injected from the nozzle 14 into the exhaust gas flow path 3 based on the upstream temperature T. In one embodiment, the injection amount adjustment unit 52 determines the opening degree to be instructed to the injection amount adjustment valve 28 based on the difference between the upstream temperature T and a predetermined temperature Tc, and transmits a signal S including this opening degree to the injection amount adjustment valve 28. The injection amount adjustment valve 28 then opens or closes at the opening degree included in the signal S. The predetermined temperature Tc is, for example, a temperature that is suitable for the catalyst 8 to promote the reduction of NOx by the reducing agent A. If Tc - T > 0 is satisfied, the opening degree determined by the injection amount adjustment unit 52 increases as the difference between Tc and T increases. If Tc - T ≦ 0 is satisfied, the opening degree determined by the injection amount adjustment unit 52 decreases as the difference between Tc and T increases, or is 0 (the injection amount adjustment valve 28 is closed).

[0030] (Actions and Effects) According to the findings of the present inventors, it has been found that the amount of NOx contained in the exhaust gas G is reduced when a gas fuel F containing hydrogen is injected into the exhaust gas G and combustion heating is performed. In particular, the amount of NOx contained in the exhaust gas G is suitably reduced when the temperature of the exhaust gas G is 500 degrees or less and the oxygen concentration of the exhaust gas G is 14% or less. According to one embodiment, the exhaust gas G is heated by the combustion of the gas fuel F containing hydrogen. Therefore, the amount of NOx contained in the exhaust gas G can be reduced while heating the exhaust gas G. Therefore, the NOx removal performance can be improved.

[0031] It is desirable that the exhaust gas G discharged from the crematorium 100 be heated to a temperature suitable for the removal of NOx by the reducing agent A. However, the flow rate and temperature of the exhaust gas G discharged from the crematorium 100 vary widely depending on the operating state of the crematorium 100. For this reason, it is necessary to heat the exhaust gas G in accordance with the flow rate and temperature of the exhaust gas G. According to one embodiment, the gas fuel F contains hydrogen. Hydrogen has a higher flame temperature than other gases such as methane and propane. For this reason, the exhaust gas G can be heated more quickly than in the method of heating the exhaust gas G by mixing it with a heating gas for temperature increase (Patent Document 1). Furthermore, hydrogen has a wide range of amounts capable of forming a stable flame (large turndown ratio). For this reason, the gas fuel F can be ejected at an amount corresponding to the flow rate of the exhaust gas G discharged from the crematorium 100. Furthermore, when starting up the denitration device 1 for the crematorium furnace, the catalyst 8 needs to be heated by the exhaust gas G so that it reaches a temperature suitable for promoting the reduction of NOx by the reducing agent A. However, as mentioned above, hydrogen has a high flame temperature, so the catalyst 8 can be heated quickly.

[0032] According to one embodiment, the exhaust gas flow path 3 includes a confluence space 10, so the denitration device 1 for the crematorium can be made more compact than when heating and supplying a reducing agent A individually to the exhaust gas G discharged from each of the multiple crematoriums 100.

[0033] According to one embodiment, the control device 18 determines the opening degree of the injection amount adjustment valve 28 based on the upstream temperature T, and opens or closes the injection amount adjustment valve 28 at this opening degree. This makes it possible to automatically and appropriately adjust the amount of gaseous fuel F injected from the nozzle 14 into the exhaust gas flow path 3. However, since hydrogen has a faster combustion speed than other gases such as methane and propane, even if the upstream temperature T drops suddenly, the exhaust gas G can be quickly heated and maintained at a temperature suitable for the removal of NOx by the reducing agent A.

[0034] The method by which the crematorium denitration device 1 adjusts the amount of gas fuel F ejected is not limited to the above-described embodiment. Figure 4 is a diagram showing the schematic configuration of the crematorium denitration device 1 according to another embodiment. Figure 5 is a schematic functional block diagram of the control device 18 according to another embodiment.

[0035] As shown in FIG. 4, in another embodiment, the control device 18 is electrically connected to each of the crematorium furnaces 100 and is capable of obtaining operation information B including whether the crematorium furnace 100 is operating.

[0036] As shown in Figure 5, the control device 18 includes an operating number acquisition unit 54 and an ejection amount adjustment unit 52. The operating number acquisition unit 54 acquires operation information B from each of the multiple crematorium furnaces 100, and acquires the number of operating crematorium furnaces 100 by summing up the number of pieces of operation information B that include information that the crematorium furnace 100 is operating.

[0037] The ejection amount adjustment unit 52 adjusts the amount of gas fuel F ejected from the nozzle 14 into the exhaust gas flow path 3 based on the number of operating crematoriums 100. In another embodiment, the ejection amount adjustment unit 52 determines the opening degree to instruct the ejection amount adjustment valve 28 based on the number of operating crematoriums 100, and sends a signal S including this opening degree to the ejection amount adjustment valve 28. The ejection amount adjustment valve 28 then opens or closes at the opening degree included in the signal S. The opening degree determined by the ejection amount adjustment unit 52 increases as the number of operating crematoriums 100 increases, and decreases as the number of operating crematoriums 100 decreases. The opening degree determined by the ejection amount adjustment unit 52 is 0 when the number of operating crematoriums 100 is 0 (the ejection amount adjustment valve 28 is closed).

[0038] According to another embodiment, the control device 18 determines the opening degree of the ejection amount adjustment valve 28 based on the number of operating crematoriums 100, and opens or closes the ejection amount adjustment valve 28 at this opening degree. Therefore, the amount of gas fuel F ejected from the nozzle 14 into the exhaust gas flow path 3 can be automatically and suitably adjusted. However, since hydrogen has a faster combustion speed than other gases such as methane and propane, even if the number of operating crematoriums 100 is reduced, the exhaust gas G can be quickly heated and maintained at a temperature suitable for the removal of NOx by the reducing agent A.

[0039] In one embodiment, the crematorium denitration device 1 removes NOx contained in the exhaust gas G discharged from multiple crematoriums 100, but the present disclosure is not limited to this embodiment. The crematorium denitration device 1 may also remove NOx contained in the exhaust gas G discharged from only one crematorium 100.

[0040] Although the crematorium denitration device 1 according to one embodiment and the crematorium denitration device 1 according to another embodiment each include a control device 18, the present disclosure is not limited to this embodiment. The crematorium denitration device 1 according to a modified embodiment includes an exhaust gas line 2, a duct burner 4, a reducing agent supply device 6, a catalyst 8, and a temperature acquisition device 16, but does not include a control device 18. In this case, an operator may adjust the amount of gas fuel F ejected from the nozzle 14 into the exhaust gas flow path 3 by adjusting the opening of the ejection amount adjustment valve 28 based on the upstream temperature T acquired by the temperature acquisition device 16. The crematorium denitration device 1 according to a modified embodiment may be configured to remove NOx contained in the exhaust gas G emitted from only one crematorium 100.

[0041] 6 is a flowchart of a method for operating the crematorium denitration device 1 according to a modified embodiment. As illustrated in FIG. 6, the method for operating the crematorium denitration device 1 according to a modified embodiment includes an upstream temperature step S1 for acquiring an upstream temperature T upstream of the duct burner 4 in the exhaust gas flow path 3, and an injection amount adjustment step S2 for adjusting the amount of gaseous fuel F injected from the nozzle 14 into the exhaust gas flow path 3 based on the upstream temperature T. According to this method, the amount of gaseous fuel F injected from the nozzle 14 into the exhaust gas flow path 3 can be suitably adjusted according to the upstream temperature T.

[0042] The denitration device 1 for crematoriums according to another modified embodiment removes nitrogen oxides NOx contained in the exhaust gas G discharged from a plurality of crematoriums 100, and is equipped with an exhaust gas line 2, a duct burner 4, a reducing agent supply device 6, and a catalyst 8, but does not include a control device 18. In this case, an operator may, for example, visually obtain the operating status of the plurality of crematoriums 100, and adjust the amount of gaseous fuel F to be sprayed from the nozzle 14 into the exhaust gas flow path 3 by adjusting the opening of the spray amount adjustment valve 28 based on the number of operating crematoriums 100.

[0043] 7 is a flowchart of a method for operating a crematorium denitration device 1 according to another modified embodiment. As illustrated in FIG. 7, the method for operating a crematorium denitration device 1 according to another modified embodiment includes an operating number acquisition step S11 for acquiring the number of operating crematoriums 100, and an ejection amount adjustment step S12 for adjusting the amount of gaseous fuel F ejected from the nozzle 14 into the exhaust gas flow path 3 based on the number of operating crematoriums 100. According to this method, the amount of gaseous fuel F ejected from the nozzle 14 into the exhaust gas flow path 3 can be suitably adjusted according to the number of operating crematoriums 100.

[0044] The contents described in each of the above embodiments can be understood, for example, as follows.

[0045] [1] The denitration device (1) for a crematorium according to the present disclosure is: A denitration device for a crematorium for removing nitrogen oxides contained in exhaust gas (G) discharged from at least one crematorium (100), an exhaust gas line (2) in which an exhaust gas flow path (3) through which the exhaust gas flows is formed; a reducing agent supply device (6) disposed in the exhaust gas passage and configured to supply a reducing agent (A) to the exhaust gas passage, the reducing agent (A) reducing nitrogen oxides contained in the exhaust gas; a catalyst (8) disposed downstream of the reducing agent supply device in the exhaust gas flow path, the catalyst promoting a reaction caused by the reducing agent; and a duct burner (4) that is arranged upstream of the reducing agent supply device in the exhaust gas flow path and has at least one nozzle (14) that sprays gas fuel (F) containing hydrogen into the exhaust gas flow path.

[0046] According to the findings of the present inventors, it has been found that the amount of nitrogen oxides contained in the exhaust gas G is reduced when gas fuel containing hydrogen is injected into the exhaust gas and the exhaust gas is heated by combustion. According to the configuration described in [1] above, the exhaust gas is heated by combustion of the gas fuel containing hydrogen. Therefore, the amount of nitrogen oxides contained in the exhaust gas can be reduced while heating the exhaust gas. Therefore, the nitrogen oxide removal performance can be improved.

[0047] It is desirable to heat the exhaust gas discharged from a crematorium to a temperature suitable for the removal of nitrogen oxides using a reducing agent. However, the flow rate and temperature of the exhaust gas discharged from a crematorium vary widely depending on the operating state of the crematorium. Therefore, it is necessary to heat the exhaust gas in accordance with the flow rate and temperature of the exhaust gas. According to the configuration described in [1] above, the gas fuel contains hydrogen. Hydrogen has a higher flame temperature than other gases such as methane and propane. Therefore, the exhaust gas can be heated more quickly than in the method of heating the exhaust gas by mixing it with a heating gas for temperature increase (Patent Document 1). Furthermore, hydrogen has a wide range of amounts capable of forming a stable flame (large turndown ratio). Therefore, the gas fuel can be ejected at an amount corresponding to the flow rate of the exhaust gas discharged from the crematorium.

[0048] [2] In some embodiments, in the configuration described in [1] above, the at least one crematorium includes a plurality of crematoriums; The exhaust gas flow path includes a confluence space (10) located upstream of the duct burner, into which exhaust gases discharged from each of the multiple crematoria enter.

[0049] According to the configuration described in [2] above, the denitration device for crematoriums can be made more compact than when heating and reducing agents are individually supplied to the exhaust gases emitted from multiple crematoriums.

[0050] [3] In some embodiments, in the configuration described in [1] or [2] above, The gas turbine engine further includes a temperature acquisition device (16) for acquiring an upstream temperature (T) on the upstream side of the exhaust gas flow path relative to the duct burner.

[0051] According to the configuration described in [3] above, the amount of gas fuel to be ejected from the nozzle into the exhaust gas flow passage can be suitably adjusted based on the upstream temperature.

[0052] [4] In some embodiments, in the configuration described in [3] above, A control device (18) for controlling the operation of the duct burner is further provided. The control device adjusts the amount of the gas fuel to be ejected from the nozzle into the exhaust gas flow path based on the upstream temperature acquired by the temperature acquisition device.

[0053] According to the configuration described in [4] above, the amount of gas fuel to be ejected from the nozzle into the exhaust gas flow passage can be automatically and suitably adjusted based on the upstream temperature.

[0054] [5] In some embodiments, in the configuration described in [2] above, Further, a control device for controlling the operation of the duct burner is provided. The control device adjusts the amount of gas fuel sprayed from the nozzle into the exhaust gas flow path based on the number of operating crematoriums.

[0055] According to the configuration described in [5] above, the amount of gas fuel sprayed from the sump into the exhaust gas flow path can be automatically and appropriately adjusted based on the number of operating crematorium furnaces.

[0056] [6] In some embodiments, in the configuration described in any one of [1] to [5] above, The duct burner is a fuel supply pipe (20) extending in the left-right direction (D2) through the exhaust gas flow path; a pair of plate-like members (21A, 21B) positioned on opposite sides of the nozzle, the at least one nozzle includes a plurality of nozzles connected to the fuel supply pipe and arranged along the left-right direction, The pair of plate-like members are arranged in the vertical direction.

[0057] According to the configuration described in [6] above, it is possible to provide a duct burner in which a plurality of nozzles are arranged in the left-right direction and a pair of plate-like members are arranged in the up-down direction.

[0058] [7] The method for operating the denitration device for a crematorium described in [1] above is as follows: A step (S1) of acquiring an upstream temperature (T) of the exhaust gas flow path upstream of the duct burner; and (S2) adjusting the amount of the gas fuel to be ejected from the nozzle into the exhaust gas passage based on the upstream temperature.

[0059] According to the method described in [7] above, the amount of gas fuel to be ejected from the nozzle into the exhaust gas passage can be suitably adjusted based on the upstream temperature.

[0060] [8] The method for operating the denitration device for a crematorium described in [3] above is as follows: A step (S11) of acquiring the number of operating crematoria; and a step (S12) of adjusting the amount of gas fuel sprayed from the nozzle into the exhaust gas flow path based on the number of operating crematoria.

[0061] According to the method described in [8] above, the amount of gas fuel sprayed from the nozzle into the exhaust gas flow path can be suitably adjusted based on the number of crematoriums in operation. [Explanation of symbols]

[0062] 1 Denitration equipment for crematorium 2 Exhaust gas line 3 Exhaust gas flow path 4 Duct Burner 6 Reducing agent supply device 8. Catalyst 10 Confluence space 12 Front of the junction 14 nozzles 16 Temperature acquisition device 18 Control Device 20 Fuel supply pipe 21A Upper plate-shaped member 21B Lower plate-shaped member 22 Flame holder 23 Through hole 24 Igniter 25 Source 26 Fuel supply line 27 Ignition nozzle 28 Spray volume adjustment valve 50 Upstream temperature acquisition section 52 Spout amount adjustment part 54 Operational Unit Acquisition Department 100 Crematorium A reducing agent B. Operation Information D1 Extending direction D2 Left / right direction D3 Up and down direction F Gas fuel G. Exhaust gas Gc exhaust gas S signal S1 Upstream temperature step S2 Spray volume adjustment step S11 Step to obtain the number of operating units S12 Spray volume adjustment step T Upstream temperature Tc Predetermined temperature

Claims

1. A denitration device for a crematorium for removing nitrogen oxides contained in exhaust gas discharged from at least one crematorium, an exhaust gas line in which an exhaust gas flow path through which the exhaust gas flows is formed; a reducing agent supply device disposed in the exhaust gas passage and configured to supply a reducing agent to the exhaust gas passage, the reducing agent reducing nitrogen oxides contained in the exhaust gas; a catalyst disposed downstream of the reducing agent supply device in the exhaust gas flow path, the catalyst promoting a reaction caused by the reducing agent; a duct burner that is arranged upstream of the reducing agent supply device in the exhaust gas flow path, the duct burner having at least one nozzle that injects gas fuel containing hydrogen into the exhaust gas flow path. Denitration equipment for crematoriums.

2. the at least one crematorium includes a plurality of crematoriums; The exhaust gas flow path is a confluence space located upstream of the duct burner, and includes a confluence space into which exhaust gases discharged from each of the plurality of crematoria flow. The denitration device for a crematorium according to claim 1.

3. a temperature acquisition device for acquiring an upstream temperature of the exhaust gas flow path upstream of the duct burner; The denitration device for a crematorium according to claim 1 or 2.

4. Further, a control device for controlling the operation of the duct burner is provided. the control device adjusts the amount of the gas fuel to be ejected from the nozzle into the exhaust gas flow path based on the upstream temperature acquired by the temperature acquisition device. The denitration device for a crematorium according to claim 3.

5. Further, a control device for controlling the operation of the duct burner is provided. The control device adjusts the amount of the gas fuel to be sprayed from the nozzle into the exhaust gas flow path based on the number of operating crematoria. The denitration device for a crematorium according to claim 2.

6. The duct burner is a fuel supply pipe extending along the left-right direction of the exhaust gas flow path; a pair of plate-like members positioned on opposite sides of the nozzle, the at least one nozzle includes a plurality of nozzles connected to the fuel supply pipe and arranged along the left-right direction, The pair of plate-like members are arranged in the vertical direction. The denitration device for a crematorium according to claim 1 or 2.

7. 2. The method for operating the denitration device for a crematorium according to claim 1, acquiring an upstream temperature of the exhaust gas flow passage upstream of the duct burner; and adjusting the amount of the gas fuel to be ejected from the nozzle into the exhaust gas flow path based on the upstream temperature. Method for operating a denitration device for a crematorium.

8. 3. The method for operating the denitration device for a crematorium according to claim 2, A step of acquiring the number of operating crematoriums; and adjusting the amount of the gas fuel to be sprayed from the nozzle into the exhaust gas flow path based on the number of operating crematoria. Method for operating a denitration device for a crematorium.

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