Coal mine return air flow low-concentration gas multi-stage purification test device

Abstract

The invention relates to a multistage purification testing device for mine return current low-concentration gas, and effectively solves the low-concentration gas purification problem. The method is characterized in that the bottom of an experiment box body is provided with a motor; the spindle of the motor is provided with a fan blade installed in the experiment box body; an operation bracket respectively provided with an air velocity sensor, a pressure sensor and a gas concentration sensor is arranged out of the experiment box body; the operation bracket consists of a base, a main shaft and a mechanical arm, wherein the main shaft is vertically installed on the base; the mechanical arm is arranged on the main shaft; one side of the lower part of the experiment box body is provided with an air outlet; the pipeline of the air outlet is provided with an exhaust fan; the top of the experiment box body is provided with an air outlet pipe; an air inlet on the other side, which corresponds to the air outlet, of the lower part of the experiment box body is provided with a main current pipeline; the main current pipeline is communicated with a gas mixing box body; the gas mixing box body is respectively connected with the pipeline of a gas tank and the pipeline of a variable-frequency air blower via a three-way valve. The multistage purification testing device for the mine return current low-concentration gas is convenient to operate and use, and is effectively used for the low-concentration gas purification experiment, and the full utilization and the production safety of resources are guaranteed.

Description

technical field [0001] The invention relates to mining (coal mine) equipment, in particular to a multi-stage purification test device for low-concentration gas in the return air flow of the coal mine. Background technique [0002] With the deep development of coal mines, the gas content in coal seams increases, the gas pressure increases, and resource and environmental protection requirements increase the intensity of gas drainage in coal mines. However, the total amount of gas drainage and utilization in coal mines is no more than the amount of gas in coal seams. 10%-20%, and most of the gas in the coal seam is decomposed during coal mining, and is discharged into the atmosphere after being diluted by mine ventilation. According to data, the amount of gas exhausted by wind in my country accounts for 80% of the total amount of coal seam gas Above, the main feature of this part of the gas is that the concentration is low, generally 0.6%-1%, and it is fully mixed with the mine r...

AI Technical Summary

Problems solved by technology

Pressure swing adsorption technology is currently considered to be a relatively mature technology, and there are a series of devices to choose from. However, its application in the field of gas purification mainly depends on its economic rationality. For low concentration, even extremely low concentration The purification process of methane gas is complicated, and the methane (CH 4 ) concentration is high, it is not suitable for gas purification with large return air volume and low concentration in coal mines, the economy is not high, and the use value is not high; The driving force (such as pressure difference, concentration difference, potential difference, etc.) makes the raw material side components selectively permeate the membrane, and the purpose of separation and purification has been achieved

Although it has been used in industry, based on the characteristics of the large return air volume of coal mines, if separation and purification are performed, the energy consumption far exceeds the methane energy obtained, which is very uneconomical; the conventional coalbed methane liquefaction system is suitable for coal mines that do not contain a large amount of nitrogen and oxygen components. High-concentration coalbed methane is not suitable for gas purification with large return air volume and low concentration in coal mines; therefore, how to effectively solve the purification (experiment) of low-concentration gas is a technical problem that needs to be carefully solved

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