COKE OVEN HEATING SYSTEM USING OXYGEN-RICH COMBUSTION

Claims

1. A coke oven heating system using combustion in an oxygen-enriched environment, comprising an oxygen generating unit, a coke oven heating unit, a flue gas treatment unit and a heat recovery unit, wherein the oxygen-depleted gas outlet of the oxygen generating unit is connected to the heat recovery unit, the oxygen-enriched gas outlet of the oxygen generating unit is connected to the coke oven heating unit, and the flue gas outlet of the coke oven heating unit is in conjunction with the flue gas treatment unit; the coke oven heating unit is connected to a fuel gas pipeline; the flue gas outlet of the coke oven heating unit is further provided with a return pipeline connected to the air inlet of the oxygen generating unit; the oxygen generation unit produces oxygen using air and heat of high-temperature coke oven flue gas, and mixes oxygen with carbon dioxide in the flue gas to form a gas mixture of oxygen and carbon dioxide, and the residual high-temperature oxygen-depleted air is supplied to a heat recovery unit for heat recovery; the coke oven heating unit uses the gas mixture of oxygen and carbon dioxide as a combustion gas to mix with fuel gas for combustion to provide heat for coke production, part of the generated high-temperature coke oven flue gas is returned to the oxygen generation unit, and another part of the generated high-temperature coke oven flue gas is supplied to a flue gas treatment unit;and the flue gas treatment unit receives the coke oven flue gas generated by the coke oven heating unit, recovers the heat of the flue gas, and treats and recovers carbon dioxide in the flue gas.

2. A coke oven heating system using combustion in an oxygen-enriched environment according to paragraph 1, characterized in that the oxygen production unit is a device for producing oxygen using a high-temperature membrane separation method.

3. A coke oven heating system using combustion in an oxygen-enriched environment according to paragraph 1, characterized in that the oxygen production unit is equipped with a reactor for producing oxygen by high-temperature air separation with the organization of chemical cycles.

4. A coke oven heating system using combustion in an oxygen-enriched environment according to paragraph 1, characterized in that the volume percentage content of oxygen in the gas mixture of oxygen and carbon dioxide at the outlet of the oxygen production unit is from 28% to 65%.

5. A coke oven heating system using combustion in an oxygen-enriched environment according to paragraph 1, characterized in that the output flow of the gas mixture of the oxygen production unit is adjustable.

6. A coke oven heating system using combustion in an oxygen-enriched environment according to claim 1, characterized in that the fuel gas is any gas from methane, blast furnace gas, coke oven gas, producer gas or natural gas.

7. A coke oven heating system using combustion in an oxygen-enriched environment according to paragraph 1, characterized in that the heat recovery unit is a plate heat exchanger or a tubular heat exchanger.