The invention discloses an oil-rich
coal underground
pyrolysis heat energy recycling
system. The oil-rich
coal underground
pyrolysis heat energy recycling
system comprises a
combustion chamber, an
air separation device, a high-temperature
heat exchanger, a
waste heat boiler, a gas-liquid separator, a
waste heat exchanger and an expansion
machine. In order to solve the problem that oil-rich
coal and other organic matters with high
tar yield are easily decomposed to generate oil gas after being heated, high-temperature
flue gas generated by
combustion in the
combustion chamber is adopted to heat pure
nitrogen, and the pure
nitrogen is used as a
heat carrier to heat an underground coal seam. The
nitrogen is adopted for heating, so that oxidation is hardly generated in the
pyrolysis process, and extracted oil is conveniently separated from the nitrogen.
Heat energy in the pyrolysis process and after the pyrolysis is finished is recycled by components in the oil-rich coal underground pyrolysis
heat energy recycling
system. In the whole system, only fuel is input, oil is output, other substances and energy are fully utilized, and most of
carbon dioxide in the oil-rich coal underground pyrolysis heat
energy recycling system is captured. According to the oil-rich coal underground pyrolysis heat
energy recycling system, the cyclic utilization of the heat energy in the oil extraction process of the oil-rich coal is realized, the utilization of the oil-rich coal is cleaner, the carbon emission is reduced, and the energy utilization is promoted to advance towards the carbon
neutralization direction.