Heat transfer capacity of heat pipes: An application in coalfield wildfire in China
Heat transfer capacity of heat pipes: An application in coalfield wildfire in China
复制标题
热管传热能力：在中国煤田火灾中的应用
DOI：
10.1007/s00231-017-2262-6
复制
发表时间：
2018-01
影响因子：
2.2
通讯作者：
Gao Wei
中科院分区：
文献类型：
--
作者：
Li Bei;Deng Jun;Xiao Yang;Zhai Xiaowei;Shu Chimin;Gao Wei
煤田野火是与采矿活动有关的严重灾害。一般来说，煤炭野火区有巨大的热量积聚区。消除煤的内热是控制煤炭野火的有效方法。在本研究中，高导热元件的热管（HP）被用来提高散热效率和阻止热量积累。建立了一个实验系统，分析了煤-高压系统的热阻网络。建立了煤-高压传热模型，研究了高压在煤堆上的传热性能。HP在初始阶段表现出出色的冷却性能，导致煤堆与环境温度之间的温差最大。而高压对煤堆温度分布的影响随着距离的增加而减小。煤温下降幅度最大的是HP半径为20 mm的区域，温度从84.3 ° C下降到50.9 °C，下降幅度为39.6%。在100、150和200 °C的初始热源温度下，80小时后HP的能量传递量分别为1.0865、2.1680和3.3649 MJ。在实验条件下，用HP将煤控制在80 °C以下。结果表明，高压具有明显的排热效果，抑制了煤的自燃。此外，本文还提出了高压技术治理典型煤田野火的技术途径。图示摘要高压作为强有力的传热元件，一旦以合理的距离插入煤堆中，对防止煤自燃和大幅度降低高温区的温度起着至关重要的作用。
Coalfield wildfires are serious catastrophes associated with mining activities. Generally, the coal wildfire areas have tremendous heat accumulation regions. Eliminating the internal heat is an effective method for coal wildfire control. In this study, high thermal conductivity component of a heat pipe (HP) was used for enhancing the heat dissipation efficiency and impeding heat accumulation. An experimental system was set up to analyze the thermal resistance network of the coal-HP system. A coal-HP heat removal model was also established for studying the heat transfer performance of HP on the coal pile. The HP exhibited outstanding cooling performance in the initial period, resulting in the highest temperature difference between the coal pile and ambient temperature. However, the effect of the HP on the distribution temperature of coal piles decreased with increasing distance. The largest decline in the coal temperature occurred in a 20-mm radius of the HP; the temperature decreased from 84.3 to 50.9 °C, a decline of 39.6%. The amount of energy transfer by the HP after 80 h was 1.0865, 2.1680, and 3.3649 MJ under the initial heat source temperatures of 100, 150, and 200 °C, respectively. The coal was governed below 80 °C with the HP under the experimental conditions. It revealed that the HP had a substantial effect on thermal removal and inhibited spontaneous coal combustion. In addition, this paper puts forward the technological path of HP to control typical coalfield wildfire.Graphical abstractAs powerful heat transfer components, as soon as HPs are inserted into the coal piles with a reasonable distance, they play a vital role in preventing coal self–ignition and substantially lowering the temperatures of high temperature zones.
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DOI：
10.1016/j.proeng.2013.08.046
发表时间：
2013
期刊：
Procedia Engineering
影响因子：
--
作者：
Ran Vijay Kumar Singh
通讯作者：
Ran Vijay Kumar Singh
DOI：
--
发表时间：
1993
期刊：
--
影响因子：
--
作者：
A. Kim;R. Chaiken
通讯作者：
A. Kim;R. Chaiken
DOI：
--
发表时间：
2009-04
期刊：
--
影响因子：
--
作者：
M. Schmidt;Suhendra;H. Rueter
通讯作者：
M. Schmidt;Suhendra;H. Rueter
影响因子：
7.4
作者：
Xia, Tongqiang;Zhou, Fubao;Gao, Feng
通讯作者：
Gao, Feng
DOI：
10.1016/j.jlp.2005.03.006
发表时间：
2005-05
影响因子：
3.5
作者：
C. Lohrer;Martin Schmidt;U. Krause
通讯作者：
C. Lohrer;Martin Schmidt;U. Krause