Abstract Accurate and quantitative investigation of the physical structure fractal geometry coal has important theoretical practical significance for bed methane (CBM) development prevention dynamic disasters such as gas outbursts. This study investigates pore characteristics soft hard coals using nitrogen carbon dioxide (N 2 /CO ) adsorption. Coal samples from Pingdingshan Mine in Henan provin...

Development and production of coalbed methane involves the production of large volumes of water. The salinities and sodium adsorption ratios of coalbed methane (CBM) water from the Powder River Basin range from 370 to 1,940 ppm and 5.6 to 69 respectively. Surface discharge of CBM water can create serious environmental problems; subsurface injection is generally viewed as economically nonviable....

Past efforts to estimate methane emissions from underground mines, surface mines, and other coal mine operations have been hampered, to different degrees, by a lack of direct emissions data. Direct measurements have been completely unavailable for several important coal mining operations. A primary goal of this study was to collect new methane emissions measurements and other data for the most ...

Geological discontinues in the coalbed, such as faults, sandstone channels, permeability facies, lithotype changes, and large scale partings in the coal seam, can cause intermittent production problems or produce unexpected amounts of water or gas from degasification boreholes. These discontinuities not only can impact methane emissions into the mine workings, especially if they hinder proper a...

Microwave heating is an efficient thermal stimulation approach in developing coalbed methane (CBM). In this paper, a new microwave technology for CBM proposed and two structure schemes of waveguide antennas are designed. After characterizing the mathematical model coaxial antenna radiation, numerical coal reservoir heated by established, which couples both electromagnetic field heat transfer. T...

The energy sector is in the spotlight today for its contribution to global warming and dependence on geopolitics. Even though many countries have reduced their use of coal, COVID-19 crisis, drop temperatures Central Asia, war between Russia Ukraine shown that coal continues play an important role this today. As long as we continue depend energetically it necessary create basis successful extrac...

Bystudying the source reservoir geochemical characteristics, cap physical properties, gas-bearing characteristics and reservoir-forming types of coal-measure gas (CMG) accumulation system, potential CMG resources in Huanghebei Coalfield was determined, sedimentary control mechanism analyzed, which is great significance for orderly development reservoirs. mainly includes abundant shale (SG; 2100...

Methane gas emission, accumulation, and explosion are the most important risk factors in underground coal mines. Hence, having a knowledge of methane gas emission potential in underground coal mines is of crucial importance in preventing the explosion risk, loss of life, and property, and providing miners' safety. The purpose of this work is to provide the prediction maps for the C1, C2, and B2...

Aiming at the problems such as low CBM utilization rate caused by concentration with methane content less than 8% extracted from a small coal mine in Hancheng mining area, Shaanxi Province, and serious environmental pollution coal-fired hot blast stove for heating, heat storage oxidation heating technology of ultra-low gas was studied combining field investigation balance calculation. This repl...