Coal underground gasification system and gasification method capable of realizing parallel transportation of multiple medium

Abstract

The invention discloses a coal underground gasification system capable of realizing parallel transportation of multiple medium. The coal underground gasification system comprises a composite materialcontinuous pipe without disconnection, the front end of the composite material continuous pipe is connected with a gas-water mixing combustor, and the rear end of the composite material continuous pipe is connected with a well to-be-transported medium interface; the composite material continuous pipe comprises an outer pipe, wherein at least three inner pipes are distributed in a pipe cavity of the outer pipe; a filling body is arranged between each inner pipe and the corresponding outer pipe; the first inner pipe is a metal pipe, and a heat insulation layer is arranged on the outer wall of the first inner pipe; a pipe cavity of the first inner pipe is used as a liquid oxygen filling channel; the second inner pipe is a non-metal pipe; a pipe cavity of the second inner pipe serves as a water conveying channel; and the filling bodies are made of a thermal insulation material. The coal underground gasification system utilizes the porous composite material continuous pipe, multiple mediumsuch as liquid oxygen, water and gas can be transported in a parallel mode, and it is guaranteed that enough flows of combustion-supporting gas and water vapor participate in underground coal gasification. The invention further discloses a coal underground gasification method method for parallel transportation of the multiple medium.

Description

technical field [0001] The invention relates to an underground coal gasification equipment, in particular to an underground coal gasification system capable of realizing multiple media simultaneous transmission. The invention also relates to an underground coal gasification method in which multiple media are simultaneously transported. Background technique [0002] China is a big country with coal reserves. Coal has always been the leading energy source in China, and it is widely used in power generation, heating, smelting, fertilizer and other fields. However, the spatial distribution of coal is uneven, mining, transportation, and burning require huge costs, and even cause astonishing waste and dust pollution. With the depletion of shallow coal resources, the cost of mining continues to increase. For coal seams buried below 800 meters, it is not only technically difficult, but also uneconomical to mine coal seams with a depth of less than 800 meters. The traditional way o...

AI Technical Summary

Problems solved by technology

However, high-pressure and high-speed oxygen transport in metal pipes can easily cause explosions; large-diameter metal pipes need to be connected every ten meters or so, and there are problems such as corrosion and leakage, which are difficult to meet safety requirements; comprehensive functions such as sensors, data lines, and cables It is more difficult to integrate the devices into one body, and it is difficult to go down the well safely

The existence of these technical obstacles has become the main reason for the delay in the commercialization of underground coal gasification technology

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