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| Titel |
Study of the technology of heat pipe on prevention wildfire of coal gangue hill |
| VerfasserIn |
Jun Deng, Bei Li, Ximei Ding, Li Ma |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250147270
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| Publikation (Nr.) |
 EGU/EGU2017-11409.pdf |
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| Zusammenfassung |
| Self-ignitable coal gangue hill (CGH) is one kind of special combustion system, which has
the characteristics of low self-ignite point, large heat storage, and easy reignition. The
currently industrial fire extinguishing methods, such as inhibiting tendency of coal
self-ignition, loessial overburden, and cement grouting, had unsatisfied effects for dispersing
the heat out in time. Correspondingly, the CGH will lead reignition more frequently
with the passage of time. The high underground temperature of CGH threatens the
process of ecological and vegetation construction. Therefore, the elimination of high
temperature is a vital issue to be solved urgently for habitat restoration. To achieve the
ultimately ecological management goal of self-ignitable CGH - extinguishing the fire
completely and never reignited, it is crucial to break the heat accumulation. Heat-pipe
(HP) has a character of high efficient heat transfer capacity for eliminating the
continuously high temperature in CGH. An experimental system was designed to test the
heat transfer performance of HP for preventing and extinguishing the spontaneous
combustion of coal gangue. Based on the heat transfer theory, the resistance network
of the coal-HP heat removal system was analyzed for studying the cooling effect
of HP. The experimental results show that the HP can accelerate the heat release
in coal gangue pile. The coal temperature could be controlled at 59.6 ˚ C with
HP in 7 h and the highest cooling value is 39.4 % with HP in 150 h, which can
effectively cool the temperatures of high temperature zones. As a powerful heat
transfer components, as soon as HPs were inserted into the CGH with a reasonable
distance, it can completely play a vital role in inhibiting the coal self-ignition process. |
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