Experimental study on explosive mechanism of spontaneous combustion gangue dump |
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Authors: | Rong-kun Pan Ming-gao Yu Lai-xiang Lu |
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Affiliation: | (1) Key Laboratory of Hebei Province for Resource Exploration Research, Hebei University of Engineering, Handan, Hebei, 056038, China;(2) Hydrological Geology Bureau of China, Coal Geology Bureau, Handan, 056002, China |
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Abstract: | In order to explore the reason for the frequency explosion of spontaneous combustion coal gangue dump and get to know their
explosion mechanism, established the experiment platform about spontaneous combustion coal gangue dump interoperable water.
The gangue dump was heated using the external heat source, and rainy weather through water mist was simulated. Simulated experiment
about explosion of spontaneous combustion coal gangue dump was carried out on the different conditions of the rainfall or
not. The unusual gases produced in the course of gangue combustion and the changes in temperature were observed, and their
impacts on the explosion of gangue dump were analyzed. The experimental results show that overall warming phenomenon of the
gangue dump after watering occurred, the amount of H2 is three times than that before watering, and the amount of CO is far greater than that on the conditions of no-watering,
at the same time combining with local observation and tests. It is found that the content of the oxygen reduce with the temperature
increasing; however, gangue dump internal hydrogen content increase unusually on the rainfall conditions at 90°C, but the
local measuring points reach the explosion limit. The existence of the CO and H2 is the main reason for inducing the explosion of spontaneous combustion coal gangue dump. |
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