Nano graphite fluid for reinforcing coal bed gas purification

Abstract

The invention discloses a nano graphite fluid for reinforcing coal bed gas purification. The nano graphite fluid adopts nano graphite particles, a base solution, a dispersant and a thermodynamic additive as the raw materials. The preparation method of the nano graphite fluid includes: subjecting the nano graphite particles, the base solution, the dispersant and the thermodynamic additive to mechanical stirring and performing dispersion by an ultrasonic dispersion instrument to obtain nano graphite fluid, i.e. an adsorbent. The preparation method of the nano graphite particles include: subjecting graphite to ball-milling in liquid carbon dioxide to a particle size of 0.1-0.2mm, then performing pressurization on the milled graphite and liquid carbon dioxide at room temperature, conducting placement under the pressure for 30-45min, then raising the temperature to 150-200DEG C, and releasing the pressure to normal pressure within 3min, thus obtaining the nano graphite particles with a particle size of 20-80nm. The CH4 recovery method provided by the invention is simple, the cost is low, and the methane recovery rate of low concentration coal bed gas is greatly increased.

Description

technical field [0001] The invention relates to a nano-graphite fluid used for strengthening the purification of coal bed gas, belonging to the technical field of energy. Background technique [0002] Gas with a methane concentration of less than 30% extracted during the coal mining process is called low-concentration coalbed methane. At present, a small part of low-concentration coalbed methane is used for power generation, and most of it is directly emptied. With breakthroughs in my country's first low-concentration coalbed methane power generation technology in the world and the successive introduction of central fiscal and taxation support policies, low-concentration coalbed methane that has been drained in vain to ensure coal mine production safety can be turned from waste to treasure. . As my country's largest coal province, Shanxi Province, if the low-concentration coalbed methane that is currently drained from coal mines can be used for power generation and heat gen...

AI Technical Summary

Problems solved by technology

Although the utilization of low-concentration coalbed methane in Shanxi Province has started in individual coal mines, most coal mining enterprises have not yet utilized low-concentration coalbed methane at all due to insufficient awareness and attention

Coal mine coalbed methane extraction in the country has reached 10 billion cubic meters, but the utilization rate is less than 50%. About 5 billion cubic meters of low-concentration coalbed methane and nearly 10 billion cubic meters of mine ventilation coalbed methane are basically not utilized, and they are directly pumped and emptied. As a result, not only increased greenhouse gas emissions, but also a waste of coalbed methane resources

When the coalbed methane pumping and wind exhausting coalbed methane are not used, it is only for safe production

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