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Dec 08 32 The process also allows exploitation of low value and difficult to mine coal deposits and because no direct mining is involved it is far more energy efficient than aboveground gasification Compared with traditional coal mining and CTL technology the capital and operating costs are lower and the water consumption is relatively lowCoal mining Coal preparation As explained above during the formation of coal and subsequent geologic activities a coal seam may acquire mineral matter veins of clay bands of rock and igneous intrusions In addition during the process of mining a portion of the roof and floor material may be taken along with the coal seam in order to create adequate working height for the equipment
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Apr 14 32 A very different way to produce gas from coal is known as underground coal gasification UCG a process that has been around since the 19th Century but which has yet to become commercially viable • The viability of the underground coal gasification project in Velenje was determined Abstract Underground coal gasification UCG is a viable possibility for the exploitation of vast coal deposits that are unreachable by conventional mining and can meet the energy economic and environmental demands of the 21st century Due to the
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Coal mining Coal preparation As explained above during the formation of coal and subsequent geologic activities a coal seam may acquire mineral matter veins of clay bands of rock and igneous intrusions In addition during the process of mining a portion of the roof and floor material may be taken along with the coal seam in order to create adequate working height for the equipment Underground Coal Gasification UCG involves igniting coal in the ground then collecting and using the gases that result from its partial combustionAlthough the idea dates back over a century very few UCG plants have ever been built Underground gasification could potentially allow the use of coal that is currently uneconomical to mine
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May 10 32 In this case underground coal gasification has emerged with the development of the tim Underground coal gasification UCG is a gasification process for controlling the combustion of underground coal to produce combustible gases through the thermal and chemical action of coalCoal gasification The term coal gasification refers to any process by which coal is converted into some gaseous form that can then be burned as a fuel Coal gasification technology was relatively well known before World War II but it fell out of favor after the war because of the low cost of oil and natural gas Source for information on Coal Gasification Environmental Encyclopedia dictionary
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Underground coal gasification UCG is an industrial process which converts coal into product gas UCG is an in situ gasification process carried out in non mined coal seams using injection of oxidants and steam The product gas is brought to the surface through production wells drilled from the surface The predominant product gases are methane hydrogen carbon monoxide and carbon dioxideAir Products Gasification Process technology is designed to be easily scaled up utilizing fewer larger units which helps to lower capital and operating costs For example Shanxi Lu’an Coal Mine Group is constructing four 3 200 t/d Air Products Gasification Process gasifiers
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One day it may be possible to construct gasification systems within a coal mine making it much easier to remove the coal in a gaseous form from its original seam In the process of liquefaction solid coal is converted to a petroleum like liquid that can be used as a fuel for motor vehicles and other applicationsUnderground coal gasification UCG is an industrial process which converts coal into product gas UCG is an in situ gasification process carried out in non mined coal seams using injection of oxidants and bringing the product gas to surface through production wells drilled from the surface
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May 22 32 Coal mine gas from abandoned mines typically contains no oxygen and its composition changes slowly The methane content ranges from 60 80 Underground Coal Gasification UCG Underground Coal Gasification is an industrial process by which coal is gasified in situ This process converts the physical coal to a product gas a type of synthetic Sep 19 32 It further introduced a definition for gasification that reads a process applied to non mined coal seams using injection and production wells drilled from the surface which enables the coal to be converted in situ into gas
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In Environmental Impacts of Coal Mining Utilization 41 Basic Principl Coal gasification means the complete conversion of coal into gas using heterogeneous gas solid reactions The main process is the reaction of the carbon of coal with steam at pressures below 10 MPa and temperatures above 750 176 C to form a “synthesis gas” containing mainly CO and H 2 with smaller amounts of Underground coal gasification UCG is a method of converting unworked coal coal still in the ground into a combustible gas UCG technology allows countries that are endowed with coal to fully utilise their resource from otherwise unrecoverable coal deposits UCG uses a similar process to surface gasification
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• Process parameters viz Pressure Outlet temperature Flow of Fuel gas is governed by coal and rock properties which vary with time and location • As gasification progresses process conditions need to be monitored continuously • Process parameters have to be adjusted to accommodate ever varying gasification conditionsThe United States Department of Energy’s Office of Fossil Energy through the Gasification Systems Program is developing innovative and flexible modular designs for converting diverse types of US domestic coal into clean synthesis gas to enable the low cost production of electricity high value chemicals hydrogen transportation fuels and other useful products to suit market needs
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Underground coal gasification UCG is an industrial gasification process which is carried out in non mined coal seams It involves injection of a gaseous oxidizing agent usually oxygen or air and bringing the resulting product gas to the surface through production wells drilled from the surfaceA new type of coal extraction method known as underground coal gasification UCG that addresses most of the problems of coal mining is being investigated and implemented globally UCG is a gasification process applied to in situ coal seams UCG is very similar to aboveground gasification where syngas is produced through the same chemical
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Waste heat from the gasification process is used by additional turbines to generate supplemental electricity a combined cycle thereby increasing the efficiency of converting coal into electricity The process integrates coal gasification with a combined cycle both of which enjoy a long operating experience it’s their integration that is FUELLING THE FIRE The chequered history of Underground Coal Gasification and Coal Chemicals around the world ‘Fuelling the Fire the chequered history of Underground Coal Gasification and Coal Chemicals around the world’ is a Friends of the Earth International report produced by Friends of the Earth Scotland and published in July
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