Experiment device and experiment method for measuring negative pressure and flow distribution characteristic in drilling hole

Abstract

The invention discloses an experiment device for measuring negative pressure and a flow distribution characteristic in a drilling hole. The experiment device comprises a gas-water separation box, a water ring vacuum pump and an anthracite sand filling box. The top of gas-water separation box is upwards connected with a water inlet / gas outlet pipe and a first connection flexible pipe, and the first connection flexible pipe is connected with the gas outlet of the water ring vacuum pump. The gas-water separation box is connected with a water outlet pipe and a water supply pipe. The anthracite sand filling box is compactly filled with anthracite sand, and an extracting pipe is arranged in the middle of the anthracite sand filling box. A plurality of pitot pipes are evenly connected with the extracting pipe at intervals. A plurality of air vents are evenly formed in the front and rear side walls and the bottom wall as well as a box cover of the anthracite sand filling box. The invention further discloses an experiment method using the experiment device. The experiment device and the experiment method can simulate the gas extraction processes of a hard coal drilled hole and a soft coal drilled hole, can measure the negative pressure and the flow distribution characteristic of the drilled hole when the hole is complete, collapsed, and blocked. A measuring device makes low influences on the negative pressure in the drilled hole, and the measuring result is close to a theoretical calculation.

Description

technical field [0001] The invention belongs to the field of mine gas disaster control, and in particular relates to an experimental device capable of measuring the distribution characteristics of negative pressure and flow distribution in gas drainage holes. Background technique [0002] As the number one "killer" of coal mine accidents, gas has always been the key monitoring object of coal mine safety. Gas control is a key factor to ensure safe production in coal mines, and it is also a difficult point that needs to be overcome urgently in the management of coal mine disasters. Gas drainage is the main measure of gas control that has been demonstrated and practiced by experts, but due to too many factors affecting gas drainage, the drainage effect cannot reach the expected goal. Therefore, it is very necessary to study and analyze the main influencing factors of gas drainage. [0003] As we all know, the negative pressure of gas drainage is an important factor affecting ...

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Problems solved by technology

[0004]1) When measuring hard coal holes, it is usually measured by lowering the pressure measuring beam tube or copper tube in the hole, but because the beam tube or copper tube The existence of the hole changes the flow field in the hole and increases the negative pressure loss in the hole. In addition, as a pressure guiding tube or a copper tube, it will also increase the negative pressure loss, resulting in a large gap between the measured result and the theoretical calculation result.

[0005]2) When measuring soft coal holes, due to the poor support in the soft coal holes, it is easy to collapse holes and block holes, which makes it impossible to lower the beam tube or copper tube, unable to measure

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