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Analog simulation system for ultra-high pressure water jet slotting of gas-bearing coal and method

A similar simulation, ultra-high pressure technology, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problem that the coupling characteristics of coal and gas are not effective, and achieve the effect of strong practicability and convenient operation

Inactive Publication Date: 2018-08-03
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scholars at home and abroad have systematically studied the impact capability of ultra-high pressure water jets and its influencing factors, the mechanism of hydraulic slotting and the development of equipment, but for the physical simulation of ultra-high pressure water jet slotting process and the process of slotting There is no effective device and method for describing the coupling characteristics of coal and gas

Method used

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  • Analog simulation system for ultra-high pressure water jet slotting of gas-bearing coal and method
  • Analog simulation system for ultra-high pressure water jet slotting of gas-bearing coal and method
  • Analog simulation system for ultra-high pressure water jet slotting of gas-bearing coal and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] see figure 1 , this embodiment discloses a gas-containing coal ultra-high pressure water jet slit similar simulation system, including a fixing device, a loading device, a degassing device, a gas injection device, a slit device, a data acquisition device, a three-way valve 5, and an experimental chamber Body 8, coal seam 16 and gas slag separator 17.

[0039] The fixing device includes two steel plates and four connecting rods connecting the two steel plates.

[0040] The experimental cavity 8 is arranged between two steel plates. The experiment chamber 8 includes a box body 801 and an upper cover 802 . The box 801 is a rectangular box as a whole. The upper cover 802 can cover the upper opening of the box body 801 . The bottom and side walls of the box body 801 are provided with a number of through holes through which pipes or pipelines pass. These through holes communicate the inner cavity of the experimental cavity 8 with the outside. A lower sealing sleeve 8011...

Embodiment 2

[0050] This embodiment discloses a method for using the gas-containing coal ultra-high pressure water jet slit similar simulation system described in Embodiment 1, including the following steps:

[0051] 1) The coal seam 16 is pressed in layers, and the measuring points are arranged in a square array on each layer. The number of side points in each row is 4 to 10, and strain gauges 13 and air pipes 11 are arranged at each measuring point. In this embodiment, the number of coal seams is 3-5.

[0052] 2) A cylindrical hole is excavated at the center of the bottom of the coal seam 16, and the height of the hole is slightly greater than the distance from the spin slotter 3 to the bottom of the experimental chamber 8.

[0053] 3) Put the coal seam 16 in the box 801, and connect the adapter 10 with the strain gauge 13 and the gas pipe 11. Start and debug the strain acquisition instrument 12, the air pressure acquisition instrument 9 and the computer 20. Cover the upper cover 802 ...

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Abstract

The invention provides an analog simulation system for ultra-high pressure water jet slotting of gas-bearing coal and a method. The simulation system comprises a loading device, a degassing device, agas injection device, a slotting device, a data acquisition device and an experimental chamber. During operation, the degassing device vacuumizes an inner cavity of the experimental chamber; the gas injection device inflates the experimental chamber under the set gas pressure; during an experiment, water flows to a spin slotting device through a pressure control device after being pressurized by an ultra-high pressure water pump; high-speed jet flow is generated by the spin slotting device to cut coal around a hole; a gas pressure acquisition instrument, a strain acquisition instrument and a flowmeter acquire changes of gas pressure, strain and gas flow in real time. The use method of the system comprises the steps of coal seam making, hole excavating, vacuumizing, inflating, loading and testing. The device can physically simulate the ultra-high pressure water jet slotting process, and has important theoretical and practical guiding significance for revealing the permeability increasing mechanism of the ultra-high pressure water jet slotting and technical parameter optimization.

Description

technical field [0001] The invention relates to the technical field of gas dynamic disasters, in particular to an ultrahigh-pressure water jet slit similar simulation system for gas-containing coal. Background technique [0002] my country is the largest coal-producing country in the world, and it is also the country with the most serious disasters and accidents. Gas drainage is the fundamental measure to prevent and control coal mine gas disasters. Due to the characteristics of "three highs and three lows" in my country's coal seam gas occurrence, the effect of pre-mining coal seam gas pre-extraction is not ideal, so it is especially necessary to take intensive measures for drainage. [0003] Hydraulic slotting is to spray water jets on the inner wall of the hole, and use the impact and water wedge action to cut several slots in the coal body, breaking the "cork effect", thereby effectively increasing the influence range of a single hole. Water jet cutting is a typical co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/22
CPCG01N33/222
Inventor 邹全乐梁金燕梁运培李清淼李全贵李学龙杨尚朋张跃兵李波
Owner CHONGQING UNIV