Combustion device

Abstract

To suppress generation of greenhouse effect gas such as carbon dioxide CO2 and nitrogen oxide NOx during burning without increasing an equipment cost in a combustion device for burning hydrocarbon fuel mixed with combustion air by using a combustion burner.SOLUTION: In a combustion device having a combustion burner 10 for burning hydrocarbon fuel CmHn mixed with combustion air Air in a furnace 1, an injection device 20 to which liquid ammonia liq. NH3 is supplied through an ammonia supply pipe 21 is provided in the vicinity of the combustion burner, and the liquid ammonia is injected into the furnace toward flame by the combustion burner so as to be burned by the injection device.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a combustion device having a combustion burner that mixes a hydrocarbon-based fuel with combustion air and burns it in a furnace. In particular, when a hydrocarbon-based fuel is mixed with combustion air and burned by a combustion burner, it is characterized in that it can easily suppress the generation of greenhouse gases such as carbon dioxide CO 2 and nitrogen oxides NOx.

Background Art

[0002] Conventionally, combustion devices having a combustion burner that uses a hydrocarbon-based fuel, mixes this hydrocarbon-based fuel with combustion air, and burns it in a furnace have been widely used.

[0003] Here, in such a combustion device, when a hydrocarbon-based fuel is mixed with combustion air and burned by a combustion burner, greenhouse gases such as carbon dioxide CO 2 are likely to be generated, and when the combustion becomes strong and the flame temperature becomes high, there is a problem that nitrogen oxides NOx are likely to be generated.

[0004] In recent years, as shown in Patent Documents 1 and 2, when supplying a hydrocarbon gas of a hydrocarbon-based fuel and combustion air to a combustion burner and mixing and burning the hydrocarbon gas and combustion air by this combustion burner, a reducing gas supply mechanism for supplying a reducing power-enriched gas or ammonia gas obtained by extracting a strongly reducing component near the combustion burner is provided, and an oxidizing gas supply mechanism for supplying an oxygen-containing gas is provided at a position farther from this reducing gas supply mechanism.

[0005] In Patent Documents 1 and 2, a reducing gas or ammonia gas is supplied from a reducing gas supply mechanism provided near a combustion burner to perform denitration of combustion exhaust gas after combustion, and an oxygen-containing gas is supplied from an oxidizing gas supply mechanism provided at a position farther from the reducing gas supply mechanism to combust the remaining combustion components that were not combusted by the combustion burner.

[0006] Here, when supplying ammonia gas from the reducing gas supply mechanism as described above, in order to gasify the ammonia fuel, an ammonia vaporizer or the like as shown in Patent Document 3 is required, resulting in high equipment costs. In addition, piping for an ammonia gas supply pipe that guides ammonia gas in a gaseous state to the reducing gas supply mechanism is required, leading to high costs and an increase in the size of the equipment.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Patent Document 3

Disclosure of the Invention

Problems to be Solved by the Invention

[0008] An object of the present invention is to solve the above problems in a combustion apparatus having a combustion burner that mixes a hydrocarbon-based fuel with combustion air and burns it.

[0009] That is, in the combustion apparatus as described above, when a hydrocarbon-based fuel is mixed with combustion air and burned by a combustion burner, the present invention aims to suppress the generation of greenhouse gases such as carbon dioxide CO 2 and nitrogen oxides NOx without incurring high equipment costs.

Means for Solving the Problems

[0010] In the combustion apparatus according to the present invention, in order to solve the above problems, in a combustion apparatus having a combustion burner that mixes a hydrocarbon-based fuel with combustion air and burns it in a furnace, an injection device through which liquid ammonia is supplied is provided in the vicinity of the combustion burner, and the injection device injects liquid ammonia into the furnace toward the From the outside of the flame flame generated by the combustion burner for combustion. is provided with a spray nozzle section for spraying liquid ammonia in a mist form to the injection device described above .

[0011] Then, as in the combustion apparatus according to the present invention, an injection device through which liquid ammonia is supplied through an ammonia supply pipe is provided in the vicinity of a combustion burner that mixes a hydrocarbon-based fuel with combustion air and burns it in a furnace, and the injection device injects liquid ammonia into the furnace toward the From the outside of the flame flame generated by the combustion burner for combustion. When this is done, depending on the combustion of ammonia, carbon dioxide CO 2 is generated so as not to do so, the amount of carbon dioxide CO generated during combustion 2 is reduced, Also due to the combustion of ammonia since the calorific value is low, the generation of nitrogen oxides NOx is also suppressed. Further, since liquid ammonia is supplied to the injection device by the ammonia supply pipe, equipment for gasifying liquid ammonia is not required, reducing the equipment cost, and the equipment can be made smaller compared to the case of introducing ammonia gas in a gaseous state. Furthermore, a spray nozzle section is provided in the injection device to spray liquid ammonia in a mist form, so that the liquid ammonia is easily combusted.

[0012] Here, in the combustion apparatus according to the present invention, the injection device can heat and inject liquid ammonia. In this way, when the injection device heats liquid ammonia to make it easier to burn and injects it toward the flame generated by the combustion burner, the injected liquid ammonia is surely burned by the flame in the combustion burner.

[0013] Also, in the combustion apparatus according to the present invention, In a combustion device having a combustion burner that mixes a hydrocarbon-based fuel with combustion air and burns it in a furnace, an injection device through which liquid ammonia is supplied through an ammonia supply pipe is provided in the vicinity of the combustion burner described above. When injecting and burning liquid ammonia from the outside of the flame generated by the combustion burner toward the flame into the furnace by the injection device, carrier gas is supplied from a carrier gas supply path to the injection device through which the liquid ammonia is supplied, and the liquid ammonia is sprayed from the injection device together with the carrier gas .

[0014] In addition, in the combustion device according to the present invention, the liquid ammonia supply pipe can be insulated or cooled. By doing so, liquid ammonia can be kept in a liquid state and sprayed (atomized) toward the flame by the combustion burner.

Effects of the Invention

[0015] In the ammonia fuel combustion device of the present invention, in the vicinity of the combustion burner that mixes the hydrocarbon-based fuel with combustion air and burns it in the furnace as described above, an injection device for supplying liquid ammonia through an ammonia supply pipe is provided. By this injection device, the liquid ammonia supplied through the ammonia supply pipe is injected into the furnace toward the From the outside of the flame flame of the combustion burner and burned. is provided with a spray nozzle section for spraying liquid ammonia in a mist form to the injection device described above Therefore, carbon dioxide CO is not generated by the combustion of ammonia, and since ammonia has a low calorific value, the generation of nitrogen oxides NOx is also suppressed. Furthermore, since the liquid ammonia is supplied to the injection device through the ammonia supply pipe, equipment for gasifying the liquid ammonia is not required, the equipment cost is reduced, and the equipment can be made smaller compared to the case of introducing ammonia gas in a gaseous state. 2 Moreover, since ammonia has a low calorific value, the generation of nitrogen oxides NOx is also suppressed. Furthermore, since the liquid ammonia is supplied to the injection device through the ammonia supply pipe, equipment for gasifying the liquid ammonia is not required, the equipment cost is reduced, and the equipment can be made smaller compared to the case of introducing ammonia gas in a gaseous state. is Moreover, since ammonia has a low calorific value, the generation of nitrogen oxides NOx is also suppressed. Furthermore, since the liquid ammonia is supplied to the injection device through the ammonia supply pipe, equipment for gasifying the liquid ammonia is not required, the equipment cost is reduced, and the equipment can be made smaller compared to the case of introducing ammonia gas in a gaseous state. Furthermore, a spray nozzle section is provided in the injection device to spray liquid ammonia in a mist form, so that the liquid ammonia is easily combusted become.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Best Mode for Carrying Out the Invention

[0017] Hereinafter, the combustion device according to the embodiment of the present invention will be specifically described with reference to the accompanying drawings. Note that the ammonia fuel combustion device according to the present invention is not limited to that shown in the following embodiments, and can be appropriately modified and implemented without changing the gist of the invention.

[0018] In the combustion device of this embodiment, as shown in FIG. 1, hydrocarbon fuel CmHn such as city gas is supplied to the combustion burner 10 provided in the furnace 1 through the fuel supply pipe 11, and combustion air Air is supplied through the air supply pipe 12. The hydrocarbon fuel CmHn and the combustion air Air are mixed in the combustion burner 10 and burned in the furnace 1.

[0019] And in the combustion device of this embodiment, a fuel control valve 11a is provided in the fuel supply pipe 11 to adjust the amount of the hydrocarbon fuel CmHn supplied to the combustion burner 10, and an air control valve 12a is provided in the air supply pipe 12 to adjust the amount of the combustion air Air supplied to the combustion burner 10.

[0020] Also, in the combustion device of this embodiment, an injection device 20 is provided near the combustion burner 10, and liquid ammonia liq.NH 3 is supplied to the injection device 20 through an ammonia supply pipe 21. An ammonia control valve 21a for adjusting the amount of the liquid ammonia liq.NH 3 supplied to the injection device 20 is provided in the ammonia supply pipe 21, and a heating device 22 for heating the liquid ammonia liq.NH 3 supplied to the injection device 20 through the ammonia supply pipe 21 to make it in a state easy to burn is provided. Note that the above-mentioned vicinity means the distance within the range where the liquid ammonia liq.NH 3 sprayed (atomized) from the injection device 20 reaches the flame of the combustion burner 10.

[0021] Then, the injection device 20 injects the liquid ammonia liq.NH heated by the heating device 22 3It is injected toward the flame burned by the combustion burner 10 and burned.

[0022] Here, in the combustion apparatus of this embodiment, the amount of the hydrocarbon-based fuel CmHn supplied to the combustion burner 10 is adjusted by the fuel adjustment valve 11a provided in the fuel supply pipe 11 as described above, and the amount of combustion air Air supplied to the combustion burner 10 is adjusted by the air adjustment valve 12a provided in the air supply pipe 12. The hydrocarbon-based fuel CmHn and the combustion air Air supplied as described above are mixed in the combustion burner 10 and burned in the furnace 1. At the same time, the amount of liquid ammonia liq.NH 3 supplied to the injection device 20 is adjusted by the ammonia adjustment valve 21a provided in the ammonia supply pipe 21 as described above, and the liquid ammonia liq.NH 3 supplied to the injection device 20 by the heating device 22 as described above is heated to make it easier to burn. The thus-heated liquid ammonia liq.NH 3 is injected toward the flame burned by the combustion burner 10 by the injection device 20 and burned, and the calorific value generated by the combustion of the hydrocarbon-based fuel CmHn and the liquid ammonia liq.NH 3 is controlled, and the ratio of the hydrocarbon-based fuel CmHn and the liquid ammonia liq.NH 3 to be burned is controlled.

[0023] Then, when the liquid ammonia liq.NH 3 heated by the heating device 22 as described above is injected toward the flame burned by the combustion burner 10 by the injection device 20 and burned, the heated liquid ammonia liq.NH 3 is surely burned by the flame in the combustion burner 10. Since carbon dioxide CO 2 is not generated by the combustion of ammonia, the amount of carbon dioxide CO 2 generated during combustion is reduced. Further, since the calorific value generated by the combustion of ammonia is low, the generation of nitrogen oxides NOx is also suppressed.

[0024] Also, in order to supply ammonia in the state of liquid ammonia liq.NH as described above to the injector 20, there is no need to provide equipment for gasifying the liquid ammonia liq.NH, and the equipment can be made smaller compared to the case where ammonia is introduced in a gaseous state. 3 Also, in order to supply ammonia in the state of liquid ammonia liq.NH as described above to the injector 20, there is no need to provide equipment for gasifying the liquid ammonia liq.NH, and the equipment can be made smaller compared to the case where ammonia is introduced in a gaseous state. 3 Also, in order to supply ammonia in the state of liquid ammonia liq.NH as described above to the injector 20, there is no need to provide equipment for gasifying the liquid ammonia liq.NH, and the equipment can be made smaller compared to the case where ammonia is introduced in a gaseous state.

[0025] In addition, in the combustion device of this embodiment 、 The method of injecting the liquid ammonia liq.NH 3 toward the flame by the combustion burner 10 by the injector 20 is not limited to that shown in FIG. 1 above.

[0026] For example, as shown in FIG. 2, a spray nozzle portion 23 is provided in the injector 20, and the liquid ammonia liq.NH 3 supplied to the injector 20 through the ammonia supply pipe 21 is atomized and sprayed from the spray nozzle portion 23 provided in the injector 20 toward the flame by the combustion burner 10, so that the liquid ammonia liq.NH 3 can be made easier to burn.

[0027] Furthermore, as shown in FIG. 3, a carrier gas cg such as air is supplied to the injector 20 through the carrier gas supply path 24, to which the liquid ammonia liq.NH 3 is supplied, and the liquid ammonia liq.NH 3 can be sprayed from the injector 20 together with the carrier gas cg.

[0028] And also in the modified examples shown in FIGS. 2 and 3 above, since carbon dioxide CO 2 is not generated by the combustion of ammonia, the amount of carbon dioxide CO 2 generated during combustion is reduced, and furthermore, since the calorific value generated by the combustion of ammonia is low, the generation of nitrogen oxides NOx is also suppressed. Moreover, in order to supply ammonia in the state of liquid ammonia liq.NH 3 to the injector 20, the liquid ammonia liq.NH3 There is no need to provide equipment for gasifying, and the equipment can be made smaller compared to the case of introducing ammonia in a gaseous state.

[0029] Also, for injecting (spraying) the low-temperature liquid ammonia liq.NH 3 in a liquid state toward the flame burned by the combustion burner 10, as shown in FIG. 4, the ammonia supply pipe 21 can be insulated with the heat insulating material 25 or cooled by a cooling means (not shown). Also, both insulation by the heat insulating material 25 and cooling by the cooling means may be performed.

Explanation of Reference Numerals

[0030] 1: Furnace 10: Combustion burner 11: Fuel supply pipe 11a: Fuel regulating valve 12: Air supply pipe 12a: Air regulating valve 20: Injection device 21: Ammonia supply pipe 21a: Ammonia regulating valve 22: Heating device 23: Spray nozzle section 24: Carrier gas supply path 25: Heat insulating material Air: Combustion air CmHn: Hydrocarbon fuel liq.NH 3 : Liquid ammonia cg: Carrier gas

Claims

1. In a combustion device having a combustion burner that mixes a hydrocarbon-based fuel with combustion air and burns it in a furnace, an injection device through which liquid ammonia is supplied is provided in the vicinity of the combustion burner. When the injection device injects liquid ammonia from the outside of the flame generated by the combustion burner toward the flame and burns it in the furnace, the injection device is provided with a spray nozzle portion for atomizing and spraying the liquid ammonia. A combustion device characterized by this.

2. In a combustion device having a combustion burner that mixes a hydrocarbon-based fuel with combustion air and burns it in a furnace, an injection device through which liquid ammonia is supplied is provided in the vicinity of the combustion burner. When the injection device injects liquid ammonia from the outside of the flame generated by the combustion burner toward the flame and burns it in the furnace, the injection device to which the liquid ammonia is supplied is supplied with carrier gas from a carrier gas supply passage, and the liquid ammonia is sprayed from the injection device together with the carrier gas. A combustion device characterized by this.

3. In the combustion device according to Claim 1 or Claim 2, the combustion device is characterized in that the injection device heats and injects the liquid ammonia.

4. In the combustion device according to Claim 1 or Claim 2, the combustion device is characterized by insulating or cooling the ammonia supply pipe.

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