Underground electric heating direct oil extraction and waste heat utilization system for oil-rich coal

Abstract

The invention discloses an underground electric heating direct oil extraction and waste heat utilization system for oil-rich coal. The underground electric heating direct oil extraction and waste heat utilization system comprises a wind-light complementary power generation device, an electric heating well, a flue gas heating vertical shaft / air cooling vertical shaft, a high-temperature heat exchanger, a gas-liquid separation device, a low-temperature heat exchanger combustion chamber, a fan and the like. Aiming at a long period required by underground direct pyrolysis of the oil-rich coal, the invention adopts a method of introducing high-temperature flue gas into a flue gas heating vertical shaft to assist an electric heating well to heat up a land parcel, an air cooling system is constructed aiming at a large amount of waste heat generated by underground direct pyrolysis of the oil-rich coal, the waste heat is effectively transferred to a next land parcel for use, and the energy utilization rate is improved. The whole system inputs electric energy, outputs oil, captures CO2 and carries out geological sequestration, so that emission of CO2 to the atmosphere is reduced, atmospheric pollution and the greenhouse effect are relieved, and other substances and energy are fully utilized. According to the method, resource waste and environmental pollution caused by underground direct pyrolysis of the oil-rich coal are effectively reduced, and the system has high economic benefits and use values.

Description

technical field [0001] The invention relates to an underground electric heating system for oil-rich coal directly extracting oil and utilizing waste heat. Background technique [0002] Oil-rich coal is a coal resource that integrates the properties of coal, oil and gas, and has better advantages in improving the conversion efficiency of oil and gas and reducing economic costs. Nowadays, the above-ground pyrolysis technology of oil-rich coal is becoming more and more mature, and the resources of oil-rich coal in the shallow layer are becoming increasingly scarce. The oil-rich coal in the deep layer has not been effectively utilized due to the difficulty of mining and low economic benefits. Solution will produce a lot of waste gas and solid pollutants. The underground direct pyrolysis technology of oil-rich coal has great potential for green and low-carbon development. The known underground direct pyrolysis technology still has the problems of low thermal energy utilization r...

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Problems solved by technology

[0003] For the oil-rich coal located in the deep underground area, the oil and gas can be extracted and utilized by underground direct pyrolysis, but because the technology of underground direct pyrolysis is not yet mature, the utilization rate of heat energy is low, the pyrolysis cycle is long, and the energy consumption is huge And other issues

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