煤层瓦斯利用技术的现状和发展趋势文献综述

 2023-05-16 09:49:54

文献综述

A biological and structural change of the initial organic material generated coal deposits over thousands of years. This technique, known as coalification, creates huge amounts of by-product gasses that increase with mining rank, with anthracite producing the most around 27,000 ft3/t of gas only. During coalification procedure, the majority of such hydrocarbons go to the atmosphere, but a minor fraction is preserved in coal. The quantity of fuel preserved in coal is determined by several factors, including coal rank, burial depth, the surrounding roof and floors to the mine shaft, geological irregularities, geological forces, and the temperature at the completion of the coalification cycle. In general, the more the mining rank and the deeper the sedimentary layer, the higher the gas concentration of coal. Coal seam gas content ranges from such a couple ft3/t to 800 ft/ton at depths up to 3000 ft. Most gasses come from coal deposits, which serve as both a supply and a storage.Hydrocarbons build up the majority of methane in coal, accounting for 8095 percent of the entire gas flow rate. Hydrocarbons, methane, propane, CO2, hydrogen, dioxide, and nitrogen make up the balance. When subjected to ventilation system in such a mining, all coal seams begin to oxidize and produce carbon monoxide and sulfur oxides. Gasoline machinery for mining areas produces Sulphur dioxide pollutants.Mineral deposits (those which are too thick, excessively thin, or lack the inner consistency to be profitably produced with current technology) may have the ability to store CO2. Many power stations are close to coal seams, lowering transportation expenses. Carbon dioxide absorption in coal deposits can be most expense technique of safely storing CO2 from the atmosphere in an absorption tower that is intended to last for geologically long periods of time. Furthermore, because mineral deposits have a significant surface to volume ratio, they can store up to 7 times the volume of fuel as other natural reservoirs. The global CO2 storage potential is estimated to be 150 Gt.CO2 binds more readily into coals than CH4, which would be naturally produced in coal seams. More put it into another aspect, coal has a 213 times greater affinity for co 2 than methane. Adsorbent trapping is the feature that allows CO2 to be stored in coal deposits. Vacuum distillation and depressurization (coalbed gas extraction, or CBM) or infusion with N2 is the most common methods for recovering greenhouse gasses in coal seams (N2-ECBM). But, there is still a large quantity of gas contained in lignite that can be produced by CO2. Improved coalbed methane extraction is the method of infusing and retaining CO2 in mineral coal deposits to improve methane production.

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