JP7184471B2 - Regenerative combustion equipment - Google Patents

Description

In the present invention, the heat stored in the heat storage material contained in the heat storage unit heats the combustion air, which is led into the furnace through the air supply/exhaust unit, and the combustion air is mixed with the fuel supplied from the fuel supply nozzle. and a regenerative combustion device that burns in the furnace, and a heat storage unit in which the heat storage material is accommodated, through the supply and exhaust unit, the flue gas after combustion in the furnace in a state where the supply of fuel from the fuel supply nozzle is stopped. a regenerative combustion device that stores the heat of the combustion exhaust gas in the heat storage material and discharges the combustion exhaust gas to the outside through the heat storage unit. The present invention relates to a regenerative combustion facility in which a low combustible fuel such as ammonia is used as the fuel in the regenerative combustion facility alternately switching between heat storage and heat storage. In particular, in burning a low-flammability fuel such as ammonia as a fuel as described above, when the low-flammability fuel such as ammonia stops burning and misfires, the low-flammability fuel such as ammonia is not burned. It is characterized in that it is possible to simply and reliably prevent the discharge of the fuel to the outside through the heat storage section of the regenerative combustion device.

Conventionally, in industrial furnaces, etc., in order to perform efficient combustion using the heat of flue gas, the heat of the flue gas burned in the furnace is stored in a heat storage material stored in a heat storage unit, and burned. The combustion air is heated by the heat stored in the heat storage material in the heat storage section, and the heated combustion air is led into the furnace through the air supply and exhaust section, and supplied from the combustion air and the fuel supply nozzle. A regenerative combustion device that mixes with the fuel and burns it in the furnace, and in a state where the supply of fuel from the fuel supply nozzle is stopped, the flue gas after combustion in the furnace passes through the supply and exhaust part to the heat storage material. A regenerative combustion device that guides the heat of the combustion exhaust gas to the stored heat storage unit, stores the heat of the combustion exhaust gas in the heat storage material, and discharges the combustion exhaust gas to the outside through the heat storage unit. , regenerative combustion equipment is used in which combustion and heat storage are alternately performed.

Further, in conventional regenerative combustion equipment, when the heated combustion air and the fuel supplied from the fuel supply nozzle are mixed and burned in the furnace as described above, the fuel generally has combustibility Hydrocarbon-based fuels with high

However, in the above regenerative combustion apparatus, when a hydrocarbon fuel is mixed with combustion air and burned, there is a problem that a large amount of greenhouse gases such as carbon dioxide are generated.

In recent years, there has been a demand for reducing greenhouse gases such as carbon dioxide, and the use of fuels other than hydrocarbon fuels has been studied.

Here, as a fuel other than the hydrocarbon fuel, it has been known to use a low combustibility fuel such as ammonia, but the low combustibility fuel such as ammonia has poor combustibility compared to the hydrocarbon fuel. Therefore, there was a problem that misfires tended to occur during combustion.

Conventionally, when burning ammonia, which is a low-combustibility fuel with poor combustibility, a diffuser is arranged downstream of a burner tip that ejects ammonia into the fuel, as shown in Patent Document 1, so that ammonia is naturally released. Together with the sucked combustion air, the surroundings of the diffuser are detoured and mixed, and the mixed ammonia and combustion air are swirled to stay above the diffuser and burned, thereby burning the ammonia. As shown in Patent Document 2, after premixing the low combustibility fuel ammonia and the combustion air and homogenizing them, the premixed gas is A proposal has been made to improve the combustibility of ammonia by swirling it with a swirler and burning it while stirring it strongly.

Further, conventionally, as shown in Patent Documents 3 to 6, in the regenerative combustion equipment as described above, ammonia is jetted to a position where the combustion exhaust gas containing nitrogen oxides NOx is guided, and after combustion It has been proposed to reduce nitrogen oxide NOx contained in combustion exhaust gas.

However, low combustibility fuels such as ammonia have poor combustibility as described above, and are likely to misfire during combustion. In the event of a misfire, unburned ammonia or other low-combustibility fuel is exhausted to the outside. Especially when low-combustibility fuel is used, ammonia is toxic. None of the above Patent Documents 1 to 6 disclose means for solving such problems.

Japanese Utility Model Publication No. 50-8257 JP 2016-130619 A JP-A-7-293815 JP-A-10-110941 JP-A-2000-65316 Japanese Patent No. 3045430

In the present invention, the heat stored in the heat storage material contained in the heat storage unit heats the combustion air, which is led into the furnace through the air supply/exhaust unit, and the combustion air is mixed with the fuel supplied from the fuel supply nozzle. and a regenerative combustion device that burns in the furnace, and a heat storage unit in which the heat storage material is accommodated, through the supply and exhaust unit, the flue gas after combustion in the furnace in a state where the supply of fuel from the fuel supply nozzle is stopped. a regenerative combustion device that stores the heat of the combustion exhaust gas in the heat storage material and discharges the combustion exhaust gas to the outside through the heat storage unit. It is an object of the present invention to solve the above-mentioned problems in a regenerative combustion facility in which heat storage is alternately performed and low combustibility fuel such as ammonia is used as the fuel.

That is, in the present invention, in performing combustion and heat storage using a low combustibility fuel such as ammonia in the regenerative combustion equipment as described above, ammonia or the like is used in the regenerative combustion equipment on the combustion side. When the combustion of the low combustibility fuel is stopped and the flame misfires, the low combustibility fuel such as ammonia is not burned and is discharged to the outside through the heat storage part of the regenerative combustion device on the heat storage side. An object of the present invention is to prevent such accidents easily and reliably.

In the regenerative combustion equipment according to the present invention, in order to solve the above problems, the combustion air is heated by the heat stored in the heat storage material contained in the heat storage unit, and guided into the furnace through the air supply and exhaust unit. , a regenerative combustion device that mixes the combustion air and fuel supplied from the fuel supply nozzle and burns it in the furnace, and after the combustion in the furnace with the supply of fuel from the fuel supply nozzle stopped The combustion exhaust gas is guided through the supply and exhaust part to a heat storage unit containing a heat storage material, the heat of the combustion exhaust gas is stored in the heat storage material, and the combustion exhaust gas is discharged to the outside through this heat storage unit. In the regenerative combustion equipment, in which combustion and heat storage are alternately performed in the paired regenerative combustion devices, low combustibility fuel is used as the fuel, and during combustion in each regenerative combustion device and a control device for outputting the flame state detected by the flame detection device. When a flame misfire in the regenerative combustion device on the combustion side is detected by the flame detection device and output to the control device, the control device detects the regenerative combustion device on the combustion side from the fuel supply nozzle. The supply of fuel to the combustion device is stopped, the high combustibility fuel is supplied to the processing burner in the regenerative combustion device on the heat storage side, and the low combustibility fuel that has not been burned by the processing burner is converted to high combustibility. The combustion exhaust gas is burned together with the fuel, and the combustion exhaust gas is stored in the heat storage material in the heat storage unit of the heat storage type combustion device on the heat storage side and discharged.

In this way, when the flame detection device detects that the flame of the low combustibility fuel in the regenerative combustion device on the combustion side has misfired, it outputs the result to the control device, and the control device controls the flow of fuel from the fuel supply nozzle to the combustion side. In addition to stopping the supply of fuel to the regenerative combustion device, highly combustible fuel is supplied to the processing burner provided for the regenerative combustion device on the regenerative side, and is not burned by this processing burner When the low combustibility fuel is burned together with the high combustibility fuel, and the combustion exhaust gas is stored in the heat storage material in the heat storage unit of the regenerative combustion device on the heat storage side and discharged, the low combustibility fuel that was not burned due to misfire is prevented from being discharged to the outside, and the heat of the combustion exhaust gas when the low combustibility fuel and the high combustibility fuel are burned together is transferred to the heat storage material of the heat storage unit in the heat storage type combustion device on the heat storage side heat will be stored in The processing burner may be provided for each regenerative combustion device as described above.

Here, in the regenerative combustion equipment according to the present invention, the processing burner is provided in the air supply/exhaust part of each regenerative combustion device, and misfire of the flame during combustion of the regenerative combustion device is detected by the flame detection device. When detected and output to the control device, the control device stops the supply of fuel from the fuel supply nozzle to the regenerative combustion device on the combustion side, and also to the supply/exhaust part of the regenerative combustion device on the heat storage side. Highly combustible fuel is supplied to the provided processing burner, and the low combustible fuel that is not burned and is led to the intake and exhaust port of the regenerative combustion device on the heat storage side is combined with the highly combustible fuel by this processing burner. Burning is preferred. It is also possible to install the treatment burner in the furnace near the regenerative combustion device, but in this case, the combustion exhaust gas is always guided through the inlet and outlet ports of the regenerative combustion device on the regenerative side. Almost all of the low combustibility fuel that has not been burned due to the misfire is sucked from the furnace into the supply/exhaust part of the regenerative combustion device on the heat storage side, and in this supply/exhaust part, almost the entire amount of the low combustibility fuel that has not been burned. is reliably combusted by the highly combustible fuel supplied to the processing burner, and is not combusted due to misfires compared to the case where the processing burner is provided in the furnace near the regenerative combustion device. It is possible to reliably prevent fuel from being discharged to the outside.

Further, in the regenerative combustion equipment according to the present invention, ammonia _NH3 can be used as the low combustible fuel. Ammonia _NH3 is particularly harmful and has a pungent odor, and if this ammonia _NH3 is allowed to burn with highly combustible fuel, it will be exhausted from the furnace to the outside, adversely affecting _the environment. Gone.

As the highly combustible fuel, hydrogen _H2 or hydrocarbon fuel can be used, and hydrogen _H2 is particularly preferably used. Thus, the use of hydrogen _H2 as a highly combustible fuel, as with hydrocarbon-based fuels, produces greenhouse gases such as carbon dioxide when burned together with the aforementioned less combustible fuels. can be prevented from occurring. In addition, since carbon dioxide is not generated even when ammonia _NH3 is burned, if ammonia _NH3 is used as the low combustibility fuel and hydrogen _H2 is used as the high combustibility fuel, carbon dioxide It is possible to prevent the generation of greenhouse gases such as Further, when hydrogen _H2 is used as the highly combustible fuel in this way, it is possible to store the hydrogen _H2 in a hydrogen cylinder and supply the hydrogen _H2 from the hydrogen cylinder through the highly combustible fuel pipe to the treatment burner. Therefore, it becomes possible to easily supply hydrogen _H2 , which is a highly combustible fuel, to the treatment burner as needed, using inexpensive equipment, without the need for large-scale equipment.

In the regenerative combustion equipment according to the present invention, when the flame detection device detects that the flame of the low combustibility fuel in the regenerative combustion device on the combustion side has misfired as described above, the result is output to the control device. The control device stops the supply of fuel from the fuel supply nozzle, supplies high combustibility fuel to the treatment burner in the regenerative combustion device on the heat storage side, and supplies low combustibility fuel that has not been burned due to misfire to this burner. In the treatment burner, the combustion exhaust gas is burned together with the highly combustible fuel, and the combustion exhaust gas is stored in the heat storage material in the heat storage part of the regenerative combustion device on the heat storage side before being discharged. It is possible to simply and reliably prevent the fuel from being discharged to the outside, and to effectively utilize the heat of the combustion exhaust gas when the low combustibility fuel and the high combustibility fuel are combusted together.

In the regenerative combustion equipment according to the embodiment of the present invention, low combustibility fuel is supplied to the regenerative combustion device on the combustion side in the paired regenerative combustion devices configured to alternately switch between combustion and heat storage. On the other hand, the combustion exhaust gas after combustion is led to the heat storage part in the regenerative combustion device on the heat storage side, the heat of the combustion exhaust gas is stored in the heat storage material, and the combustion exhaust gas is discharged to the outside through this heat storage part. It is an explanatory diagram. In the regenerative combustion equipment according to the embodiment, when the flame detection device detects that the combustion flame of the low combustibility fuel in the regenerative combustion device on the combustion side has misfired, the control device controls the regenerative combustion on the combustion side. In addition to stopping the supply of low combustibility fuel to the device, high combustibility fuel is supplied from the processing burner provided in the air supply and exhaust part of the regenerative combustion device on the heat storage side, and is supplied from the furnace to this air supply and exhaust part. The guided unburned low combustibility fuel is combusted together with this high combustibility fuel, and the flue gas after combustion is led to the heat storage part of the regenerative combustion device on the heat storage side, and the heat of the flue gas is stored in the heat storage material. FIG. 4 is a schematic cross-sectional explanatory view showing a state in which combustion exhaust gas is discharged to the outside through the heat storage unit after the heating. In the regenerative combustion equipment according to the same embodiment, if unburned low combustible fuel still remains in the furnace after the treatment shown in FIG. While the supply of low combustibility fuel to the device is stopped, the combustion air is supplied to the heat storage part of the regenerative combustion device on the previous heat storage side and led into the furnace, while the air for combustion is supplied to the regenerative combustion device on the previous combustion side. A high combustibility fuel is supplied to a processing burner provided in the air supply/exhaust part, and the unburned low combustibility fuel guided from the furnace to the air supply/exhaust part is combined with the high combustibility fuel by the treatment burner. After combustion, the flue gas after combustion is led to the heat storage part in this regenerative combustion device, the heat of the flue gas is stored in the heat storage material, and then the flue gas is discharged to the outside through this heat storage part. It is cross-sectional explanatory drawing.

Hereinafter, a regenerative combustion facility according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. It should be noted that the regenerative combustion equipment according to the present invention is not limited to those shown in the following embodiments, and can be modified as appropriate without changing the gist of the invention.

In the regenerative combustion equipment in this embodiment, as shown in FIGS. 1 to 3, a pair of regenerative combustion devices 10a and 10b are provided so as to face the inside of the furnace 1. Combustion and heat storage are alternately performed in the paired regenerative combustion devices 10a and 10b.

In addition, in the regenerative combustion equipment in this embodiment, ammonia _NH3 , which is a low combustible fuel, is used as the fuel.

In the regenerative combustion devices 10a and 10b in the regenerative combustion equipment of this embodiment, when burning the ammonia NH ₃ of the low combustible fuel, the heat storage units 11a and 11b containing the heat storage material x are used. to heat the combustion air Air by the heat stored in the heat storage material x and supply it into the furnace 1 through the respective air supply and exhaust sections 12a and 12b, and each regenerative combustion device The ammonia NH ₃ is supplied to the vicinity of the air supply/exhaust units 12a and 12b from the respective fuel supply nozzles 13a and 13b provided in the vicinity of the air supply/exhaust units 12a and 12b in 10a and 10b, respectively, and the combustion fuel is supplied. He is trying to burn it in the furnace 1 by mixing with air Air.

On the other hand, in the regenerative combustion devices 10a and 10b, when the heat of the flue gas after burning the ammonia NH ₃ in the furnace 1 is stored in the heat storage material x accommodated in the heat storage units 11a and 11b, respectively, In a state in which the supply of fuel from the fuel supply nozzles 13a and 13b is stopped, the flue gas after combustion in the furnace 1 is supplied to the heat storage units 11a and 11b containing the heat storage material x through the air supply/exhaust units 12a and 12b, respectively. , the heat of the combustion exhaust gas is stored in the heat storage material x, and the combustion exhaust gas after the heat is stored in the heat storage material x is discharged to the outside.

In addition, in the regenerative combustion equipment of this embodiment, the processing burners 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a and 20a, 20a, 20a and 20a, 20a, _20a , and 20a, respectively, are provided. 20b is provided, and the hydrogen _H2 and the combustion air Air are supplied to the respective processing burners 20a and 20b, and the hydrogen _H2 is supplied to the respective processing burners 20a and 20b at the supply and exhaust portions 12a and 12b. I am trying to burn it.

Further, in the regenerative combustion equipment in this embodiment, as described above, each of the regenerative combustion devices 10a and 10b detects the state of the flame when the low combustibility fuel ammonia NH ₃ is burned. Flame detection devices 31a and 31b are provided corresponding to the regenerative combustion devices 10a and 10b, respectively, and the states of the flames detected by the flame detection devices 31a and 31b are output to the control device 30. The control device 30 performs the following operations. I am trying to control as shown.

Here, in the regenerative combustion equipment in this embodiment, in supplying the combustion air Air to the respective heat storage units 11a and 11b in the respective regenerative combustion devices 10a and 10b as described above, each heat storage device 40 On-off valves 41a and 41b are provided in portions of an air guide path 41 for guiding combustion air Air toward the heat storage units 11a and 11b in the type combustion devices 10a and 10b, respectively.

Then, the opening/closing valves 41a and 41b are opened and closed by the control device 30, and combustion of the heat storage units 11a and 11b in the regenerative combustion devices 10a and 10b through the air guide path 41 from the air supply device 40 is performed. He is trying to switch the supply and stop of the air Air for use. Here, with respect to the on-off valves 41a and 41b, the open state is shown in white, while the closed state is shown in black.

In addition, in the regenerative combustion equipment of this embodiment, low combustibility fuel is supplied from the fuel supply nozzles 13a and 13b provided in the vicinity of the air supply/exhaust units 12a and 12b of the regenerative combustion devices 10a and 10b as described above. In supplying the ammonia NH ₃ into the furnace 1, on-off valves 51a and 51b are provided in portions of the fuel guide path 51 for guiding the ammonia NH ₃ to the fuel supply nozzles 13a and 13b, respectively.

The on-off valves 51a and 51b are opened and closed by the control device 30 to switch between supply and stop of ammonia _NH3 supplied to the fuel supply nozzles 13a and 13b through the fuel guide path 51. ing. Here, with respect to the on-off valves 51a and 51b as well, the open state is shown in white, while the closed state is shown in black.

Further, in the regenerative combustion equipment in this embodiment, as described above, in each of the regenerative combustion devices 10a and 10b, the combustion exhaust gas in the furnace 1 after burning the ammonia NH ₃ is When the combustion exhaust gas is sucked from the air supply/exhaust units 12a and 12b of the type combustion devices 10a and 10b through the heat storage units 11a and 11b in which the heat storage material x is accommodated and is exhausted to the outside, the combustion exhaust gas is stored in the heat storage type combustion devices 10a and 10b. Opening/closing valves 61a and 61b are provided in portions of the exhaust path 61 leading to the exhaust device 60 through the portions 11a and 11b, respectively.

The on-off valves 61a and 61b are opened and closed by the control device 30 to switch between the regenerative combustion devices 10a and 10b that lead the combustion exhaust gas to the exhaust device 60 through the exhaust path 61. Here, with respect to the on-off valves 61a and 61b as well, the open state is shown in white, while the closed state is shown in black.

Further, in the regenerative combustion equipment in this embodiment, in supplying the combustion air Air to the processing burners 20a and 20b provided in the air supply/exhaust units 12a and 12b of the regenerative combustion devices 10a and 10b, On-off valves 42a and 42b are provided in portions of the processing air guide path 42 for guiding the combustion air Air from the air supply device 40 to the respective processing burners 20a and 20b. 42b is opened and closed to switch the supply of combustion air Air from the air supply device 40 through the processing air guide path 42 to the processing burners 20a and 20b and to stop the supply.

In addition, in supplying hydrogen _{H2 as} a highly combustible fuel to each of the processing burners 20a and 20b, the hydrogen _H2 is led from the hydrogen cylinder 70 containing hydrogen H2 to each of the processing burners 20a and 20b. On-off valves 71a and 71b are provided in the highly combustible fuel guide path 71, respectively. The supply and stop of hydrogen _H2 to the burners 20a and 20b are switched. In this embodiment, hydrogen _H2 is supplied from the hydrogen cylinder 70 to each of the processing burners 20a and 20b, but hydrogen _H2 is supplied continuously from a hydrogen supply device (not shown) capable of continuously supplying hydrogen H2. It is also possible to supply _H2 to each treatment burner 20a, 20b.

Further, in the regenerative combustion equipment in this embodiment, an NH ₃ detection sensor 80 for detecting ammonia NH ₃ in the furnace 1 is provided.

In the regenerative combustion equipment of this embodiment, one regenerative combustion device 10a burns ammonia NH ₃ while the other regenerative combustion device 10b stores the heat of combustion exhaust gas and discharges the combustion exhaust gas. , in one regenerative combustion device 10a for burning ammonia _NH3 , as shown in FIG. The combustion air Air is guided to the heat storage section 11a in one of the regenerative combustion devices 10a, and the combustion air Air is heated by the heat storage material x stored in the heat storage section 11a. , the ammonia NH 3 is supplied into the furnace 1 through the air supply/exhaust part 12a of the regenerative combustion apparatus 10a, and one opening/closing valve 51a provided in the fuel guide path 51 is opened to allow ammonia NH ₃ to flow through the fuel guide path 51. Guided to one fuel supply nozzle 13a, ammonia NH ₃ is injected from this fuel supply nozzle 13a toward the combustion air Air supplied into the furnace 1 through the air supply/exhaust part 12a, and mixed with the combustion air Air. let it burn.

On the other hand, in the other regenerative combustion device 10b for accumulating the heat of the combustion exhaust gas as described above and discharging the combustion exhaust gas to the outside, the other opening/closing valve 61b provided in the exhaust path 61 is opened to Ammonia NH ₃ is mixed with the combustion air Air and burned in the furnace 1 as described above, and the combustion exhaust gas is sucked into the supply and exhaust part 12b of the other regenerative combustion device 10b by the exhaust device 60, After the flue gas is guided to the heat storage section 11b in the other regenerative combustion device 10b to store the heat of the flue gas in the heat storage material x, the flue gas is led to the exhaust device 60 through the exhaust path 61 and discharged to the outside. Allow to exhaust.

In the regenerative combustion equipment in this embodiment, the regenerative combustion device 10a on one side and the regenerative combustion device 10b on the other side have a combustion operation for burning ammonia NH ₃ and a heat storage operation for storing the heat of the combustion exhaust gas. Although not shown, the regenerative combustion device 10a and the regenerative combustion device 10b are operated in a manner opposite to that shown in FIG.

In addition, in these regenerative combustion devices 10a and 10b, in the state where ammonia _NH3 is mixed with combustion air Air and burned in the furnace 1 as described above, the controller 30 controls the supply of ammonia NH3. The on-off valves 42a, 42b provided in the portion of the processing air guide path 42 that guides the combustion air Air from the gas unit 40 to the processing burners 20a, 20b are closed, and the combustion air is supplied to the processing burners 20a, 20b. Air is not supplied, and the on-off valves 71a and 71b provided in the highly combustible fuel guide path 71 leading from the hydrogen cylinder 70 containing the hydrogen _H2 to the processing burners 20a and 20b are closed. The hydrogen _H2 is not supplied to the processing burners 20a and 20b, and the hydrogen _H2 is not burned in the supply/exhaust portions 12a and 12b of the regenerative combustion devices 10a and 10b by the processing burners 20a and 20b. there is

Here, in one of the regenerative combustion devices 10a that are performing the combustion operation, if the ammonia _NH3 is no longer burned and the flame misfires, the ammonia _NH3 remaining in the furnace 1 without being burned performs the heat storage operation. Therefore, it is necessary to prevent the exhaust gas from being discharged to the outside through the other regenerative combustion device 10b.

Therefore, in the regenerative combustion equipment in this embodiment, for example, in one of the regenerative combustion devices _10a performing the combustion operation as shown in FIG. In this case, as shown in FIG. 2, when the flame detection device 31a for detecting the state of the flame in the regenerative combustion device 10a detects misfire of the flame in the regenerative combustion device 10a, the flame detection device 31a detects This result is output to the control device 30 described above.

When the misfire of the flame in the regenerative combustion device 10a on the combustion side is output from the flame detection device 31a to the control device 30, the control device 30 controls the fuel supply nozzle 13a of the regenerative combustion device 10a on the combustion side. The on-off valve 51a provided in the fuel guide path 51 that guides the ammonia NH ₃ into the furnace 1 is closed to stop the supply of the ammonia NH ₃ to the fuel supply nozzle 13a, thereby preventing the ammonia NH ₃ from being supplied into the furnace 1. . Further, the control device 30 opens the on-off valve 42b in the processing air guide path 42 for guiding the combustion air Air from the air supply device 40 to the processing burner 20b provided in the regenerative combustion device 10b on the heat storage side. Then, the combustion air Air is supplied to the heat storage side processing burner 20b, and the on-off valve 71b in the highly combustible fuel guide path 71 leading from the hydrogen cylinder 70 containing hydrogen _H2 to the heat storage side processing burner 20b. is opened, hydrogen _H2 is supplied to the heat storage side processing burner 20b, and this processing burner 20b burns the hydrogen _H2 in the supply/exhaust part 12b of the heat storage side regenerative combustion device 10b. do.

In this way, the combustion exhaust gas containing ammonia _NH3 remaining in the furnace 1 without being burned due to flame misfire in the regenerative combustion device 10a on the combustion side is removed by the exhaust device 60 from the regenerative combustion device on the regenerative combustion side. Ammonia NH ₃ contained in the flue gas which is sucked into the air supply/exhaust part 12b in 10b is combusted together with the hydrogen H ₂ in the air supply/exhaust part 12b by the treatment burner 20b. The flue gas containing the flue gas thus generated is guided to the heat storage unit 11b in the regenerative combustion device 10b on the heat storage side, and the heat of the flue gas is stored in the heat storage material x. Therefore, the ammonia NH ₃ contained in the combustion exhaust gas is prevented from being discharged to the outside from the regenerative combustion device 10b on the heat storage side.

In addition, the combustion exhaust gas containing ammonia NH ₃ is sucked into the regenerative combustion device 10b on the heat storage side in this way, and the ammonia NH ₃ contained in the combustion exhaust gas is removed from the combustion exhaust gas in the air supply/exhaust part 12b of the regenerative combustion device 10b. If ammonia NH 3 still remains in the furnace 1 after being burned together with hydrogen H ₂ by 20b, the ammonia _{NH 3 in} the furnace 1 is detected by the NH ₃ detection sensor 80, The result of detection by the NH ₃ detection sensor 80 is output to the control device 30 described above.

When the NH ₃ detection sensor 80 outputs to the control device 30 that ammonia NH ₃ remains in the furnace 1, the regenerative combustion devices 10a and 10b of FIG. By switching between combustion and heat storage in the regenerative combustion devices 10a and 10b, the on-off valves 51a and 51b provided in the fuel guide path 51 for guiding the ammonia NH ₃ to the fuel supply nozzles 13a and 13b of the regenerative combustion devices _10a and 10b are closed. is not supplied into the furnace 1, the control device 30 closes one on-off valve 41a provided in the air guide path 41, opens the other on-off valve 41b, and operates the air supply device Combustion air Air is guided from 40 to the heat storage section 11b of the other regenerative combustion device 10b, and the heat storage material x stored in the heat storage section 11b heats the combustion air Air, thus heating the combustion air. Air is supplied into the furnace 1 through the air supply/exhaust part 12b of the regenerative combustion device 10b.

Further, the control device 30 closes the on-off valve 42b in the processing air guide path 42 leading from the air supply device 40 to the processing burner 20b provided in the regenerative combustion device 10b, and hydrogen H ₂ from the hydrogen cylinder 70 to the processing burner 20b. The on-off valve 42a in the processing air guide path 42 leading to the processing burner 20a provided in 10a is opened to supply combustion air Air to one of the processing burners 20a, and a hydrogen cylinder 70 containing hydrogen _H2. to one of the processing burners 20a is opened to supply hydrogen _H2 to the processing burner _20a . Combustion is performed in the air supply/exhaust section 12a of the regenerative combustion device 10a.

Also, the control device 30 closes the other on-off valve 61b provided in the exhaust path 61 and opens the one on-off valve 61a, and the exhaust device 60 controls the gas remaining in the furnace 1 as described above. Ammonia NH ₃ contained therein is sucked together with the heated combustion air Air supplied into the furnace 1 from the regenerative combustion device 10b into the air supply/exhaust portion 12a of one regenerative combustion device 10a, and thus sucked. The ammonia NH ₃ thus obtained is combusted together with the hydrogen H ₂ in the supply/exhaust unit 12a by the processing burner 20a, and the combustion exhaust gas thus combusted is stored as heat in the regenerative combustion device 10a. After the heat of the combustion exhaust gas is stored in the heat storage material x in the heat storage portion 11a, the exhaust gas is exhausted to the outside through the exhaust path 61 by the exhaust device 60. FIG. In this way, the ammonia NH ₃ is also prevented from being exhausted to the outside from one of the regenerative combustion devices 10a.

When ammonia NH ₃ still remains in the furnace 1, the ammonia NH ₃ in the furnace 1 is detected by the NH ₃ detection sensor 80, and the detection result by the NH ₃ detection sensor 80 is controlled as described above. The output is output to the device 30 _, and the operation described above is repeated in each _of the regenerative combustion devices 10a and 10b. Repeat until it is no longer detected by 80 .

In this way, the ammonia NH ₃ remaining in the furnace 1 without being burned due to flame misfire is burned by the processing burners 20a and 20b in the regenerative combustion devices 10a and 10b as described above, and the furnace 1 It is possible to reliably prevent ammonia NH ₃ remaining inside from being discharged to the outside.

Reference Signs List 1: Furnace 10a: Regenerative Combustion Device 10b: Regenerative Combustion Device 11a: Heat Storage Unit 11b: Heat Storage Unit 12a: Supply/Exhaust Unit 12b: Supply/Exhaust Unit 13a: Fuel Supply Nozzle 13b: Fuel Supply Nozzle 20a: Processing Burner 20b: Processing burner 30: Control device 31a: Flame detection device 31b: Flame detection device 40: Air supply device 41: Air guide path 41a: On-off valve 41b: On-off valve 42: Processing air guide path 42a: On-off valve 42b: On-off valve 51: Fuel guide path 51a: On-off valve 51b: On-off valve 60: Exhaust device 61: Exhaust path 61a: On-off valve 61b: On-off valve 70: Hydrogen cylinder 71: Highly combustible fuel guide path 71a: On-off valve 71b: On-off valve 80 : NH3 detection sensor Air : Combustion air H2 : Hydrogen NH3 : Ammonia NOx : Nitrogen oxide x : Heat storage material

Claims (5)

Combustion air is heated by the heat stored in the heat storage material accommodated in the heat storage unit and guided into the furnace through the air supply/exhaust unit. and the combustion exhaust gas after combustion in the furnace is guided through the supply and exhaust part to the heat storage part containing the heat storage material in a state where the supply of fuel from the fuel supply nozzle is stopped. A regenerative combustion device that stores the heat of the exhaust gas in a heat storage material and discharges the combustion exhaust gas to the outside through the heat storage unit is provided in a pair, and the paired regenerative combustion device alternately performs combustion and heat storage. In the regenerative combustion equipment that is switched to the above, low combustibility fuel is used as the fuel, and a flame detection device that detects the state of the flame during combustion in each regenerative combustion device, and the flame detection device. A control device for outputting the state of the flame is provided, and a processing burner for burning highly combustible fuel is provided for each regenerative combustion device, and the misfire of the flame in the regenerative combustion device on the combustion side is the above-mentioned flame detection. When detected by the device and output to the control device, the control device stops the supply of fuel from the fuel supply nozzle to the regenerative combustion device on the combustion side and releases highly combustible fuel to the regenerative combustion device. Supplied to a processing burner in a regenerative combustion device, the low combustibility fuel that was not burned by the processing burner is combusted together with the high combustibility fuel, and the combustion exhaust gas is the heat storage part of the regenerative combustion device on the heat storage side. A regenerative combustion facility characterized by storing heat in a heat storage material in and discharging it. 2. The regenerative combustion equipment according to claim 1, wherein the processing burner is provided in the air supply/exhaust portion of each regenerative combustion device, and misfire of a flame during combustion of the regenerative combustion device is detected by a flame detection device. When it is output to the control device, the control device stops the supply of fuel from the fuel supply nozzle to the regenerative combustion device on the combustion side, The high combustibility fuel is supplied to the burner for processing, and the low combustibility fuel that is not burned and is led to the intake and exhaust part of the regenerative combustion device on the heat storage side is burned with this high combustibility fuel. Regenerative combustion equipment. 3. The regenerative combustion equipment according to claim 1, wherein said low combustible fuel is ammonia. 4. The regenerative combustion equipment according to claim 1, wherein said highly combustible fuel is hydrogen. 5. The regenerative combustion equipment according to claim 4, wherein the highly combustible fuel, hydrogen, is contained in a hydrogen cylinder, and the hydrogen is supplied from the hydrogen cylinder to the treatment burner.

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