Underground Coal Gasification System and Gasification Method Capable of Simultaneously Transporting Multiple Mediums

Abstract

The invention discloses an underground coal gasification system capable of simultaneously transporting multiple media, which comprises a continuous composite material coiled tube, the front end of which is connected to a gas-water mixing burner, and the rear end of the composite material coiled tube The end is connected with the interface of the medium to be transported in the well; the composite continuous tube includes an outer tube, and at least three inner tubes are distributed in the lumen of the outer tube; a filling body is arranged between each of the inner tubes and the outer tube; the first The inner tube is a metal tube, and the outer wall of the first inner tube is provided with a heat insulation layer; the lumen of the first inner tube is used as a liquid oxygen perfusion channel; the second inner tube is a non-metallic tube; the lumen of the second inner tube is used as a water delivery channel channel; the filling body adopts heat insulating material. The invention utilizes the continuous tube of porous composite material to realize simultaneous transmission of liquid oxygen, water, gas and other media, so as to ensure that the combustion-supporting gas and water vapor with sufficient flow rate participate in the underground coal gasification. The invention also discloses an underground coal gasification method in which multiple media are simultaneously transported.

Description

technical field [0001] The invention relates to an underground coal gasification device, in particular to an underground coal gasification system capable of realizing simultaneous transport of multiple media. The invention also relates to an underground coal gasification method in which multiple media are transported concurrently. Background technique [0002] China is a big country in coal storage. Coal has always been the protagonist of China's energy, and is widely used in power generation, heating, smelting, fertilizer and other fields. However, the spatial distribution of coal is uneven, and mining, transportation, and combustion 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. It is not only technically difficult, but also uneconomical to mine coal seams with a depth of less than 800 meters. The traditional mining and use of coal has become less and less in...

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

Images