【摘要】：為破壞煤堆內(nèi)部蓄熱環(huán)境,有效降低煤自然發(fā)火的危險(xiǎn)性,預(yù)防煤堆自燃,基于熱棒閉式汽-液兩相流強(qiáng)化熱傳導(dǎo)原理,構(gòu)建煤自燃防滅火熱棒移熱降溫性能試驗(yàn)測(cè)試系統(tǒng),研究煤堆升溫過(guò)程中熱棒對(duì)其內(nèi)部溫度場(chǎng)分布的影響效果。熱棒對(duì)煤堆自燃升溫過(guò)程具有較明顯的抑制降溫效果,煤體與熱棒距離越近,降溫效果越明顯;熱棒的累積移熱量和降溫能力隨時(shí)間的增加而不斷增大。結(jié)果表明,試驗(yàn)條件下,煤堆內(nèi)部各測(cè)點(diǎn)最高降溫依次為13.30,9.80,7.70,6.70,4.50,3.20,1.50和0.50℃,對(duì)應(yīng)溫度降幅依次為29.00%,23.90%,24.70%,19.40%,16.00%,13.50%,8.90%和3.87%,平均降溫速率分別為1.20,0.90,0.70,0.62,0.39,0.29,0.16和0.11℃/h。
[Abstract]:In order to destroy the internal thermal storage environment of coal pile, effectively reduce the risk of coal spontaneous combustion and prevent coal pile from spontaneous combustion, based on the principle of heat transfer enhanced by closed steam-liquid two-phase flow of hot rod, a test and test system for heat transfer and cooling performance of coal self-ignition and extinguishing heat rod is constructed. The effect of thermal rod on the temperature distribution in coal heaps is studied. The distance between coal body and heat rod is closer, the cooling effect is more obvious, and the accumulated heat transfer and cooling capacity of the hot rod increase with the increase of time. The results show that under the test conditions, the highest temperature drop at each measuring point is 13.30, 9.80,7.70,6.70,4.50,3.20,1.50 and 0.50 鈩，

本文編號(hào)：2471428