Heat storage burner

Abstract

To provide a regenerative burner in which the concentration of nitrogen oxides contained in the combustion gas is suppressed. [Solution] The regenerative burner (100, 100A) comprises a combustion furnace (10), a first flow path (30) connected to the combustion furnace, a second flow path (31) connected to the combustion furnace, and at least one first nozzle unit (50, 60). Inside the combustion furnace, a combustion gas (G3) is generated by burning a fuel gas (G1) containing ammonia at an air ratio of less than 1.00. While the fuel gas is burning, first air (A1) is supplied into the combustion furnace from the first flow path, second air (A2, A4) is supplied into the combustion furnace from at least one first nozzle unit, and a portion of the combustion gas flows from inside the combustion furnace into the second flow path. The air ratio is the value obtained by dividing the sum of the amounts of first air and second air by the amount of air required to completely combust the fuel gas.

Claims

1. Combustion furnace and A first flow path and a second flow path connected to the combustion furnace, At least one first nozzle unit, It comprises a first heat storage unit, In the aforementioned combustion furnace, combustion gas is generated by burning a fuel gas containing ammonia at an air ratio of less than 1.

00. The first flow path connects the first heat storage unit and the combustion furnace. When the fuel gas is being burned, first air is supplied into the combustion furnace from the first heat storage unit and the first flow path, second air is supplied into the combustion furnace from at least one first nozzle unit, and a portion of the combustion gas flows from the combustion furnace into the second flow path. A regenerative burner in which the air ratio is the amount of air required to completely combust the fuel gas, divided by the sum of the amounts of the first air and the second air.

2. The regenerative burner according to claim 1, wherein the at least one first nozzle unit comprises a second nozzle unit that supplies a third air from the second air into the combustion furnace and a third nozzle unit that supplies a fourth air from the second air into the combustion furnace.

3. The regenerative burner according to claim 2, wherein the second nozzle unit supplies both the fuel gas and the third air into the combustion furnace.

4. The heat storage burner according to claim 3, wherein the amount of the third air is greater than the amount of the fourth air.

5. A combustion furnace, A first flow path and a second flow path connected to the combustion furnace, It comprises at least one first nozzle unit, In the aforementioned combustion furnace, combustion gas is generated by burning a fuel gas containing ammonia at an air ratio of less than 1.

00. When the fuel gas is being burned, first air is supplied into the combustion furnace from the first flow path, second air is supplied into the combustion furnace from at least one first nozzle unit, and a portion of the combustion gas flows from the combustion furnace into the second flow path. The air ratio is the value obtained by dividing the sum of the amounts of the first air and the second air by the amount of air required to completely combust the fuel gas. The at least one first nozzle unit includes a second nozzle unit that supplies a third air from the second air into the combustion furnace, and a third nozzle unit that supplies a fourth air from the second air into the combustion furnace. The second nozzle unit supplies both the fuel gas and the third air into the combustion furnace. The fourth nozzle unit, It further includes a fifth nozzle unit, The combustion furnace has a first side wall and a second side wall facing the first side wall. The first flow path is connected to the first side wall, The second flow path is connected to the second side wall, The second nozzle unit and the third nozzle unit are attached to the first side wall, The fourth nozzle unit and the fifth nozzle unit are attached to the second side wall, A regenerative burner in which, while the fuel gas is being burned, a fifth air is further supplied into the combustion furnace from the fourth nozzle unit, and a sixth air is further supplied into the combustion furnace from the fifth nozzle unit.

6. A second heat storage unit, Further equipped with a sixth nozzle unit, The second flow path connects the second heat storage unit and the combustion furnace. The regenerative burner according to any one of claims 1 to 5, wherein the unburned fuel gas contained in the combustion gas flowing through the second flow path is mixed with the seventh air supplied from the sixth nozzle unit and completely combusted.

7. A third flow path connected to the combustion furnace, Further equipped with a seventh nozzle unit, When the fuel gas is being burned, the remaining portion of the combustion gas flows from the combustion furnace into the third flow path. The regenerative burner according to claim 6, wherein the combustion gas flowing through the third flow path is mixed with the eighth air supplied from the seventh nozzle unit and completely combusted.

8. Further equipped with a fourth channel, The combustion gas that has passed through the second passage and the combustion gas that has passed through the third passage merge in the fourth passage and are then exhausted as exhaust gas. The regenerative burner according to claim 7, wherein the concentration of nitrogen oxides in the exhaust gas is less than 120 ppm when converted to an oxygen concentration of 11 percent.

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