Coal gas surface filling device applicable to model test

Abstract

The invention discloses a coal gas surface filling device applicable to a model test. The coal gas surface filling device comprises an inflation panel, wherein one end of the inflation panel is connected with an inflation pipeline; an inflation switch is arranged on the inflation pipeline; the inflation panel comprises a panel; the panel is provided with gas guide grooves which are vertically and horizontally crossed and communicated; the gas guide grooves are communicated with the inflation pipeline through an inflation channel at the end part of the panel; a lower sieve plate, a steel wire gauze and an upper sieve plate are orderly arranged on the panel; the edge joint of the lower sieve plate, the steel wire gauze, the upper sieve plate and the panel is sealed by a rubber sealing strip; a fixed pressing strip is arranged on the edge of the sieve plate, and the lower sieve plate, the steel wire gauze and the upper sieve plate are fixed on the panel through bolts. The coal gas surface filling device can carry out large-area uniform and fast gas filling on a test coal seam, has good gas permeability and boundary binding character, can filter fine pulverized coal, and does not destroy the model or leak air from the side; the flow and pressure are adjustable; the safety is high; the structure is simple; the performance is excellent; the price is low, and maintenance and exchange are convenient.

Description

technical field [0001] The invention relates to a gas test device, in particular to a coal body gas surface filling device for high gas occurrence mine coal and gas outburst model tests. Background technique [0002] Coal and gas outburst is a very serious natural disaster that seriously threatens the safety of underground coal mines. With the increase of coal mine mining depth in our country, the situation of coal and gas outburst is more severe, and corresponding large-scale model tests are also carried out to study its laws. One of the key factors for the success of the coal and gas outburst model test is the gas filling. [0003] In foreign countries, the former Soviet Union conducted one-dimensional outburst simulation experiments and developed corresponding test devices in the 1950s. The tests showed that only under a large gas pressure gradient (gas pressure drops by several MPa per centimeter) coal can There is a risk of being broken and thrown. Then in the 1960s...

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Problems solved by technology

[0009] 1) At present, the gas loading equipment for the coal and gas outburst model test is connected to the coal sample cavity in the coal sample chamber through the pressurized gas channel, and the air intake source is mostly "point inflation". This gas filling method causes In order to avoid uneven inflation and slow inflation speed, it is easy to form gas accumulation during the inflation process, which will increase the local gas pressure and seriously affect the test results.

[0010] 2) Foamed metal is used as a breathable panel. Compared with hundreds of meshes of coal powder, the pores are too large, and the cost is high, so it is not easy to purchase. Therefore, this "surface inflation" method is not easy to be widely used

[0011] 3) During the pumping process, the current gas loading method is easy to suck out solid particles, forming a large cavity in the model, destroying the integrity of the model, and using foam metal to easily block the pores, thus affecting the test results

[0012] 4) At present, there is no independent coal gas surface filling device suitable for model tests. The gas surface filling device has not realized modular design, and cannot be adjusted according to actual conditions and test requirements, which is not conducive to maintenance

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