采礦專業(yè)畢業(yè)設計外文翻譯--關于煤層沼氣的一些經(jīng)常出現(xiàn)的問題-采礦工程-文庫吧
2025-04-16 15:10 本頁面
【正文】 和河流、飲用水的水位、牲畜飲用的井水的影響的關注。如果煤層蓄水層為泉水和河流提供水份（煤層向河流或泉排水），一個地區(qū)的煤層沼氣開發(fā)可能減少向那些水體排水。如果河流和泉不靠煤層蓄水層的排水，流量減少就會很小。然而，如果煤層沼氣水是 陸地供給或流向池塘（那些池塘大部分經(jīng)常不被充填，并且排放到地面下），在開發(fā)過程中由于地下水流向河流，河流流量會增加。 如果飲用水或牲畜用井直接從煤層中得到，那么一個地區(qū)的煤層沼氣開發(fā)就可能減少井的水位。對于泉水流量的影響期間和井中可利用水，就會依靠總地區(qū)的開發(fā)和調(diào)整。 附錄 2 Coal bed Methane Frequently Asked Questions Kristin Keith, Jim Bauder, Montana State University John Wheaton, Montana Bureau of Mines and Geology What is coal bed methane? A ponent of natural gas is a substance called methane (CH4). Coal bed methane (CBM) is the same pound as the methane which is the primary energy source in natural gas. Coal bed methane, however, is found in coal seams, and produced by nontraditional means, and therefore while it is sold and used the same as traditional natural gas, its production is very different. Coal bed methane is generated either from a biological process as a result of microbial action or from a thermal process as a result of increasing heat with depth of the coal. Often a coal seam is saturated with water and methane is held in the coal by the pressure of the water. Currently, natural gas from coal beds is approximately 7% of the total natural gas production in the United States, nearly onethird of the estimated 184 trillion cubic feet of gas in the Rocky Mountain Region is in coal seams. An estimated 24 TCF of recoverable CBM resources may lie below the Powder River basin of Montana and Wyoming. Where does coal bed methane exist? According to the CBM Association of Alabama, 13% of the land in the lower 48 United States has some coal under it, and some of this coal contains methane either in the form we know as traditional natural gas or as CBM. According to the United States Geological Survey, the Rocky Mountain Region has extensive coal deposits with significant storage of coalbed methane gas. Untapped resources of coal bed methane exist in the Powder River Basin of Wyoming and Montana, the Greater Green River Basin of Wyoming, Colorado, and Utah, the UintaPiceance Basin of Colorado and Utah, and the Raton and San Juan Basins of Colorado and New Mexico. It is estimated the Rocky Mountain region has about 3058 trillion cubic feet of recoverable CBM. How do gas panies extract the methane from the coal seam? Methane travels with the ground water being pumped from the coal from a well drilled and pleted in a coal seam that contains methane and fixed with a water methane has very low solubility in water it separates from the water in the well before the water enters the pump. The extraction of CBM involves pumping the available water from the coal seam aquifer in order to reduce the water pressure that holds the gas in the coal seam. CBM producers try not to dewater the coal seam. The goal is to decrease the water pressure in the coal seam to just above the
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