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Low-permeability strong-adsorbability coal body heat injection equipment

A technology with strong adsorption and low permeability, applied in mining equipment, gas discharge, safety devices, etc., can solve the problems of long gas extraction time, low extraction efficiency, and coal seam gas control effect not reaching the expected goal.

Pending Publication Date: 2021-11-02
CHINA COAL TECH ENG GRP CHONGQING RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above research results have laid the theoretical foundation for coal seam heat injection to control gas, but they only stay at the stage of theory and test simulation, and have not transformed the research results and applied them in coal mines.
Moreover, in the case of some domestic coal mines adopting conventional gas control measures, the effect of coal seam gas control still cannot reach the expected goal. less efficient

Method used

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  • Low-permeability strong-adsorbability coal body heat injection equipment
  • Low-permeability strong-adsorbability coal body heat injection equipment
  • Low-permeability strong-adsorbability coal body heat injection equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment one is basically as attached figure 1 , 2 Shown: as figure 1 The heat injection equipment for low-permeability and strong-absorptive coal body shown includes a heating box 1, a delivery pipe 2, a delivery pipe 3 and a pressure relief extraction pipe 4. The top of the heating box 1 is welded with lifting rings on the left and right sides, and the bottom of the heating box 1 Rollers are installed on the lower surface, and a heater is installed in the bottom of the heating box 1. The heater can be a U-shaped heating tube 5, and the heating tube 5 is connected to the power supply through a wire; the top of the heating box 1 has a water injection port 6 and an exhaust port 7. ; There is a cavity (not shown in the figure) in the side wall of the heating box 1, and a thermal insulation material, such as an asbestos layer, is placed in the cavity.

[0022] Conveying pipe 2 runs through heating box 1, and the left end of conveying pipe 3 is connected with the air ou...

Embodiment 2

[0027] On the basis of Example 1, as figure 2 As shown, there is a groove in the square hole section 8 of the conveying pipe 2, and the groove is arranged opposite to the pressure relief extraction pipe 4, and a limit mechanism is arranged in the groove, and the limit mechanism includes a tension spring and a limit plate 11. The position plate 11 is slidably arranged in the groove, and the limit plate 11 is connected with the bottom of the groove by an extension spring, that is, the lower end of the extension spring is welded to the bottom of the groove, and the upper end of the extension spring is welded to the lower surface of the limit plate 11. When the negative pressure pump sucks the gas, the limit plate 11 slides upward under the negative pressure and contacts the one-way valve plate 10, thereby preventing the one-way valve plate 10 from turning counterclockwise under negative pressure to prevent gas from entering the heating box 1 .

Embodiment 3

[0029] On the basis of embodiment one or embodiment two, such as image 3 As shown, the transmission pipe 3 welds some booster blocks 12 (only two are shown in the figure) in the circumferential direction of its outer wall, as Figure 4 As shown, the inner wall of the right end of the delivery pipe 2 is provided with an annular groove and a number of chute 13 and arc groove 14 matched with the booster block 12, the annular groove is used to accommodate the gasket 15, and the two ends of the gasket 15 are connected to the ring groove. The side walls are close to each other, and the outer wall of the gasket 15 leaves a distance from the bottom of the annular groove.

[0030]The chute 13 communicates with the arc groove 14, and the left side wall of the arc groove 14 is obliquely provided with a channel 16 connected to the annular groove, and the right side wall of the arc groove 14 is also provided with a channel 16, and the channel 16 is slidably provided with a booster Bar 17...

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Abstract

The invention relates to the field of gas extraction, in particular to low-permeability strong-adsorbability coal body heat injection equipment, which comprises a heating box, a conveying pipe, a transmission pipe and a pressure relief extraction pipe; a heater is arranged in the heating box; a water injection port and an exhaust port are formed in the heating box; the conveying pipe penetrates through the heating box; the transmission pipe is detachably connected with one end of the conveying pipe; the pressure relief extraction pipe is connected with the side wall of one end of the conveying pipe and communicated with the conveying pipe; a valve is arranged on the pressure relief extraction pipe; a one-way valve plate is rotationally arranged in the conveying pipe; and the one-way valve plate is located between the heating box and the pressure relief extraction pipe. By the adoption of the technical scheme, the extraction rate of coal seam gas can be increased conveniently.

Description

technical field [0001] The invention relates to the field of gas drainage, in particular to low-permeability and strong-adsorption coal heat injection equipment. Background technique [0002] Coal seam gas pre-extraction is one of the fundamental measures to solve coal mine gas accidents. The gas in the coal body is mainly in the adsorbed state and the free state. The transformation of the adsorbed gas into the free gas is mainly controlled by two factors: coal reservoir pressure and temperature. At present, most coal mines in my country adopt the method of pre-extracting gas by reducing the pressure of coal reservoirs. Aiming at coal heat injection gas control technology, domestic and foreign technicians have carried out a series of research work and obtained a lot of research results. [0003] Existing research results show that temperature is an important factor affecting the adsorption, desorption and seepage of coal seam gas. For example, Ma Dongmin et al. carried ou...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21F17/00
CPCE21F7/00E21F17/00
Inventor 李守瑞王广宏黄旭超徐彬赵坤汪长明张劲松陈亮欧聪何明川李向往赵华军陶冬张君平张尧刘建华周中强李文于宝种黄森林王正帅张志刚张冲王建军
Owner CHINA COAL TECH ENG GRP CHONGQING RES INST
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