Device and method for utilizing solar energy and hot wind for heating and exploitation of coalbed gas in low-permeability reservoir

Abstract

The invention discloses a device and method for utilizing solar energy and hot wind for heating and exploitation of coalbed gas in a low-permeability reservoir. The device includes a membrane-type separating device, a first pressurizing draught fan, a first control valve, a U-shaped well, a second control valve, a second pressurizing draught fan, a flowmeter, a heat exchanger, a cold fused salt storage tank, a fused salt pump, a parabolic grooved-type solar energy heat collector heating device, a fused salt conveying pipeline preheating heat preservation device, a first draught fan, an air purifier, a second draught fan, a first valve, a second valve, a hot fused salt storage tank and a third valve. According to the device, not only are the problems that existing electric heating devices are low in heating speed, likely to break down and high in electric heating cost avoided, but also the problems, such as the large consumption of water resources during heating of coal reservoirs through high-temperature overheating water vapor and the water blockage caused by introducing the high-temperature overheating water vapor into the coal reservoirs, are solved since fused salt and air areadopted as working media of the device. Moreover, the device can be used in arid areas or some areas in extreme lack of water, and exhaust gas discharged by the device cannot pollute the air environment.

Description

technical field [0001] The invention belongs to the technical field of underground coal seam thermal mining methods, and in particular relates to a device and method for exploiting low-permeability coalbed gas by heating with solar hot air. Background technique [0002] Coal bed methane is a kind of unconventional natural gas associated with coal. Its main component is methane. It is not only an important clean energy and high-quality chemical raw material, but also the biggest hidden danger of coal mine disasters. Gas accidents are of great significance to alleviate the shortage of oil and gas resources in my country and protect the atmospheric environment. [0003] At present, there are various extraction methods for coalbed methane, and thermal injection mining of coalbed methane has been generally recognized. Many scholars at home and abroad have explored the influence of temperature on the gas desorption rate in coal. The desorption rate of coalbed methane. In the prio...

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Problems solved by technology

Coal reservoirs are heated by electric heating. Due to the low heat transfer coefficient of coal seams, the heating process is very slow, and the production process is prone to failure. The cost is too high, and it is often impossible to realize in arid or severe special areas. At the same time, after the coal seam is injected with water, the coal seam will be blocked by water and the permeability of the coal seam will be reduced.

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