Oil-rich coal underground pyrolysis heat energy recycling system

Abstract

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.

Description

technical field [0001] The invention relates to an oil-rich coal underground pyrolysis heat energy recycling system. Background technique [0002] Oil-rich coal is a type of coal with a tar yield greater than 7%. The tar product can be extracted through pyrolysis, which can effectively convert coal resources into oil and gas resources. However, above-ground coal pyrolysis requires a large amount of chemical equipment, which pollutes the atmosphere and leaves a large amount of solid waste. Underground in-situ pyrolysis extracts oil and gas resources through direct heating underground, and the pyrolysis residues produced are still buried underground, and the pollution to the atmosphere and soil is basically controllable, so it is a cleaner method to extract oil and gas . However, in-situ pyrolysis requires a long process, and large-scale heating of underground coal seams will inevitably consume a large amount of heat. Therefore, the way of generating heat energy and the util...

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Problems solved by technology

However, in-situ pyrolysis requires a long process, and large-scale heating of underground coal seams will consume a lot of heat, so the way of generating heat energy and the utilization of waste heat after the pyrolysis process is very important

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