Device and method for desorbing gas in coal seam by using ultrasonic principle

Abstract

The invention discloses a device and method for desorption of gas in a coal seam by utilizing an ultrasonic principle. The device comprises a plurality of gas desorption columns disposed in each coal bed gas producing well. The side surfaces of column bodies of the gas desorption columns are provided with a plurality of gas nozzles and a plurality of ultrasonic wave emission heads connected with a ultrasonic generator; a gas inlet channel and a gas outlet channel are formed in each column body; a pressure sensor is disposed in each gas inlet channel; the gas inlet channel is connected with a gas feeding end of a gas compressor; a gas discharging end of the gas compressor is connected with the gas outlet channel; the gas outlet channel is connected with each gas nozzle; and the gas inlet channel is further connected with a gas output system via a gas discharging pipe equipped with a pressure limiting valve. Desorption of the gas in the coal seam can be obtained by ultrasonic waves; high-pressure injection airflows produced by the gas can be sprayed to the coal seam, so gas extraction can be assisted.

Description

technical field [0001] The invention belongs to the field of coal mining, and in particular relates to a device and method for desorbing methane gas in a mining coal seam by using the ultrasonic principle. Background technique [0002] The main component of coal mine gas is methane, and it also contains a certain amount of nitrogen, oxygen, water, carbon dioxide, etc., among which methane is the most valuable. my country is a large country of coal reserves and production, and the reserves of coal mine gas are very rich. The development and utilization of coal mine gas is a basic energy strategy of the country. In order to make good use of coal gas, and to reduce the harm caused by gas to production safety in the process of coal mining, the state has put forward the policy of "exhaust first and then extract, extract as much as possible, and use to promote extraction" for the utilization of coal mine gas. Usually, in the process of gas extraction, certain technical auxiliary ...

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Problems solved by technology

Usually, in the process of gas extraction, certain technical auxiliary means are adopted to desorb the gas attached to the coal seam, so as to better extract the gas. Currently, in the process of desorption and extraction of gas In order to make the gas extraction reach the final gas safety content range of the coal seam as much as possible, in many cases, the external gas (mixed gas) is used to input the gas extraction channel to assist the extraction of gas. However, this method not only makes the extracted gas Compromised gas purity and cumbersome subsequent gas separation procedures

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