Spontaneous combustion of subsurface coal is an extremely complicated chemical and physical changing process. In order to quantitatively understand the development of underground coal fires, the heat transfer processes coupled with multi-stage oxidation of coal are investigated by experimental and numerical methods in this paper. With controlled temperature and under lean oxygen conditions, the...

In the process of underground gasification coal, top rock coal seam will experience a certain high temperature action and be in complex stress environment. Therefore, it is great theoretical engineering significance to study effect cyclic unloading loading on mechanical properties rocks under action. this thesis, stress–strain curves sandstone different high-temperature treatments are obtained ...

Gasification is a process that converts organic or fossil based carbonaceous materials into carbon monoxide, hydrogen and carbon dioxide. The process of producing energy using the gasification method has been in use for more than 180 years. During that time coal and peat were used to power these plants. Initially developed to produce town gas for lighting & cooking in 1800s, this was replaced b...

Abstract Underground coal gasification (UCG) is a technology that can increase the value of coal. This turns into gas below surface through process. UCG offers many applications for power generation, heating, and chemical industry. The Mangunjaya area one prospecting area, located in South Sumatra Basin, which has been actively producing long time. study focused on determining potential locatio...

Dust concentration levels in underground coal mines are of primary importance and have to be controlled to prevent pulmonary disease in miners. Different mining areas are exposed to different dust levels and to minimize the probability of occupational respiratory disease of coal miners, it is necessary to evaluate dust concentration in the different working areas. This study aimed to evaluate d...

Gasification is the thermochemical conversion of organic feedstocks mainly into combustible syngas (CO and H(2)) along with other constituents. It has been widely used to convert coal into gaseous energy carriers but only has been recently looked at as a process for producing energy from biomass. This study explores the potential of gasification for energy production and treatment of municipal ...

Self-ignited, naturally occurring coal fires and fires resulting from human activities persist for decades in underground coal mines, coal waste piles, and unmined coal beds. These uncontrolled coal fires occur in all coal-bearing parts of the world (Stracher, 2007) and pose multiple threats to the global environment because they emit greenhouse gases—carbon dioxide (CO2), and methane (CH4)—as ...