Oil-rich coal self-heating and electric heating coupled in-situ pyrolysis system

Abstract

The invention discloses an in-situ pyrolysis system for coupling self-heat generation and electric heating of oil-rich coal. The in-situ pyrolysis system comprises a wind-light complementary power generation device, a heat injection well/air cooling inlet well, a production well/air cooling outlet well, an electric heating well, a temperature monitoring well, a high-temperature heat exchanger, a primary separation device, a secondary separation device, a medium-temperature coal tar storage tank, a low-temperature coal tar storage tank and the like. Aiming at the long period required by underground direct pyrolysis of the oil-rich coal, the invention adopts a method of slowly oxidizing self-generated heat of coal to assist an electric heating well to heat a land parcel, and aims at a large amount of waste heat generated by underground direct pyrolysis of the oil-rich coal, an air cooling system is constructed, and the waste heat is effectively transferred to a next land parcel for use. In order to achieve conditions required by slow oxidation of coal, preheating air needs to be secondarily preheated, and the temperature and the amount of oxygen entering a coal seam area are strictly controlled by a temperature control system. The whole system inputs electric energy, outputs oil, captures CO2 and carries out geological sequestration, the atmospheric pollution and the greenhouse effect are relieved, and the rest of energy is fully utilized.

Description

technical field [0001] The invention relates to an in-situ pyrolysis system in which oil-rich coal self-generated heat and electric heating are coupled. Background technique [0002] The oil-rich coal resource that integrates the properties of kerosene and oil, and oil-rich coal has better advantages in improving oil and gas conversion efficiency and reducing economic costs. At this stage, the clean and efficient ground pyrolysis integrated mining technology of oil-rich coal is becoming mature, and the oil-rich coal resources in shallow layers are becoming increasingly scarce. The oil-rich coal in deep layers has not been effectively utilized due to its difficulty in mining and low economic benefits. At the same time, the above-ground pyrolysis of oil-rich coal will produce a large amount of waste gas and solid pollutants. Underground direct pyrolysis technology of oil-rich coal has great potential for green and low-carbon development, and has accumulated certain technologi...

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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 in-situ pyrolysis, but the direct undergroun

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