Cleaning out the pulverized coal deposited at bottom of a coalbed methane (CBM) well is key to achieving continuous CBM drainage and prolonging workover period. In this study, Fluent used in conjunction with standard k-? model Eulerian-Eulerian simulate analyse jet erosion particles. The depth width stable pit that formed by jet-impacting under different conditions are determined provide theore...

Abstract Coal elastic parameters are an important index reflecting the material composition and porosity, which can be used to guide reservoir evaluation safe mining of coal coalbed methane (CBM). In this study, samples collected from seams #2, #3, #7 + 8, #9 in Yuwang colliery, eastern Yunnan, were studied, influences organic matter, ash content porosity on investigated. The results show that ...

clean hydrogen is the major energy carrier for power production. the conversion of co to co2 and zero emission during hydrogen energy production causes high capital cost. it is a matter of prestige to optimize the process in order to make zero emission and cost effective production of clean hydrogen energy and electric power. in this era, coal gasification is the most promising technology for t...

Ukraine has substantial reserves of methane resident in underground coal seams and surrounding rock strata that, if captured, would constitute a valuable energy resource. During 2002, Ukraine consumed 78 billion cubic meters (bcm) of natural gas and produced domestically only 18 bcm. Ukraine receives approximately 30 bcm per year as a transit fee for the use of their pipeline system to transpor...

Longwall coal mine operators in the U.S. are required to ventilate multipanel longwall districts, but may have little or no knowledge about what happens to the ventilation air between the inlet evaluation points (IEPs), bleeder evaluation points (BEPs) and bleeder fans. The effectiveness of bleeder performance can directly influence the ability of a ventilation system to remove and dilute coal ...

The occurrence and migration of coalbed methane (CBM) is inseparably associated with the pore structure within coal seams. Three Permian Longtan Formation tectonic samples (QL, XL, XT) from Guizhou Province were studied to determine size distribution characteristics, as well factors that influence adsorption. Adsorption test results show all generally have “ink bottle”-type pores, large capacit...

Coal dust explosions in underground coal mines are pre­ vented by a generous application of rock dust (usually lime­ stone). If an explosion should occur, the rock dust disperses, mixes with the coal dust and prevents fl ame propagation by acting as a thermal inhibitor or heat sink. To investigate this process in more detail, a number of ex­ plosion experiments using various coal dust and limes...