Device and method for purifying and concentrating coal bed gas and treating produced water

Abstract

The invention relates to the technical field of exploitation and utilization of coal bed gases, and in particular relates to a device and a method for purifying and concentrating a coal bed gas and treating produced water. The device comprises a wet flame arrester, a water ring vacuum pump, a gas flow meter, a one-way gas valve, a separator, a fireproof and explosion-proof compressor, a safety valve, a hydrate generating unit, a gas-liquid two-phase valve, a gas concentration monitor, a stop valve, a filter, a one-way liquid valve, a slurry pump, a three-phase separator, a granulating machine, a stop valve, an outer transportation vehicle, a hydrate decomposing unit, a water pump, an ice making device, a grinding device, a liquid flow meter, a Laval spray valve and a clarifier. Two hydrate reactors are adopted to fix CO2 and methane in the coal bed gas respectively, and the CO2 released after regeneration is used as a gas-driving raw gas for improving the recovery ratio of the coal bed gas, so that the release of CO2 of a gas field is reduced, and high-concentration methane hydrate is granulated and transported outwards for application; and a salt draining effect during formation of the hydrate is used to ensure that a lot of salt-containing produced water during exploitation of the coal bed gas can be treated to meet requirements for reinjection to a stratum layer, so that resources are saved, and the environment is protected.

Description

technical field [0001] The invention relates to the mining and utilization technology of coalbed methane, in particular to a ground device integrating the functions of coalbed methane purification, "effective gas" concentration and produced water treatment, specifically a coalbed methane Gas purification, enrichment and produced water treatment device and method. Background technique [0002] As a kind of unconventional natural gas, coalbed methane occupies an important position in today's energy field. It refers to the associated mineral resources of coal with methane as the main component existing in coal seams; countries around the world such as the United States, Russia, Canada, etc. There are very rich coalbed methane resources, and its exploitation is very important. On the one hand, the extraction of coalbed methane can reduce the free gas in the coal seam, which greatly reduces the harm of gas. On the other hand, a large amount of produced gas should be treated to a ...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low concentration of coalbed methane resources in our country, great difficulty in mining, uneasy treatment of produced water and poor economic efficiency, and provide a purification method for collecting coalbed methane on the basis of the existing technology, and an improvement of "effective gas". Concentrated and produced water treatment and other functions integrated ground device

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