The method of increasing the strength of the rock above the coal seam and the method of building an underground gasification furnace
A technology of underground gasification above the coal seam, applied in coal gasification, underground mining, construction, etc., can solve the problems of gasifier temperature reduction, underground gasification failure, flame extinguishing, etc., to improve service life, reduce collapse probability, The effect of increasing strength
Active Publication Date: 2017-05-24
ENN SCI & TECH DEV
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Problems solved by technology
However, during the gasification process, with the gradual increase of the burn-out area, the pressure on the coal seam roof continues to increase. Once the coal seam roof collapses, the water in the weak aquifer will enter the underground gasifier, making the gasification The temperature of the furnace is lowered, and even the flame will be extinguished, resulting in the failure of underground gasification
[0003] Patent CN101832137A mentions a method for reserving the support columns of the coal seam roof, mainly injecting cement slurry and other coagulation materials into a section of the coal seam, and then gasifying. This method is simple to operate, but the cement reserved in the coal seam The slurry column will affect the gasification effect, making it difficult to uniformly control and regulate the entire gasification furnace during the gasification process
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[0020] Embodiments of the present invention are described below with reference to the drawings.
[0021] refer to figure 1 , the underground gasification furnace construction method of the present invention includes an embodiment of the method for increasing the strength of the rock formation above the coal seam of the present invention, so first refer to figure 1 This embodiment of the method of the present invention for increasing the strength of a rock formation above a coal seam is described. It includes the following steps: step 1, establishing at least one reinforcement hole 2 in the rock formation 1; step 2, injecting a reinforcing agent into at least one reinforcement hole 2, and the reinforcement agent is solidified in the reinforcement hole 2 and its surrounding rock formations.
[0022] Specifically, the formation for constructing the underground gasifier includes at least a coal seam 4, a rock formation 1, and a weak aquifer 8 from bottom to top, wherein the rock ...
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The invention relates to the field of coal gasification, in particular to a method for increasing the strength of a rock stratum above a coal seam and an underground gasification furnace building method. The method for increasing the strength of the rock stratum above the coal seam includes the steps of firstly, forming at least one reinforcing hole in the rock stratum; secondly, pouring reinforcing agent into each reinforcing hole, wherein the reinforcing agent cures in the reinforcing hole and the rack stratum around the reinforcing hole. The underground gasification furnace building method includes the steps of a, increasing the strength of the rock stratum above the coal seam by the method mentioned above; b, building a gas inlet well, a horizontal passage and a gas outlet well which are sequentially communicated, wherein the horizontal passage is located in the coal seam below the reinforced rock stratum. By the method for increasing the strength of the rock stratum above the coal seam, the strength of the rock stratum above the coal seam can be enhanced to lower the collapse probability of the rock stratum. By the underground gasification furnace building method, the service life of an underground gasification furnace can be prolonged.
Description
technical field [0001] The invention relates to the field of underground coal gasification, in particular to a method for increasing the strength of a rock layer above a coal seam and a method for building an underground gasification furnace. Background technique [0002] The underground gasification process is a brand-new coal mining method, which is fundamentally different from the traditional physical coal mining method. Underground gasification is a chemical coal mining method. The coal buried in the ground is burned in a controlled manner on the spot. Combustible gas is produced through the thermal action and chemical reaction of coal and delivered. However, during the gasification process, with the gradual increase of the burn-out area, the pressure on the coal seam roof continues to increase. Once the coal seam roof collapses, the water in the weak aquifer will enter the underground gasifier, making the gasification The temperature of the furnace is lowered, and even...
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IPC IPC(8): E21B43/295
Inventor赵娟潘霞
OwnerENN SCI & TECH DEV