Coal underground direct pyrolysis product separation system coupled with oxygen-enriched combustion

The invention discloses an underground direct coal pyrolysis product separation system coupled with oxygen-enriched combustion. The underground direct coal pyrolysis product separation system comprises air separation equipment, equipment related to pyrolysis product separation, equipment related to carbon capture, an oxygen-enriched combustion boiler, a heater in the boiler and the like. The air separation plant provides nitrogen and oxygen for underground direct pyrolysis and oxygen-enriched combustion of coal, the oxygen-enriched combustion boiler can heat the nitrogen, provide a heat source for pyrolysis of an underground coal seam and heat pyrolysis products, so that solid particles in the pyrolysis products are removed through a gas-solid separation method instead of a liquid-solid separation method, and the product separation difficulty is reduced; the separated pyrolysis gas can be used for reducing nitrogen oxides generated during oxygen-enriched combustion. Tar in the underground direct pyrolysis pro