本文選題：臨界自燃著火點(diǎn)　切入點(diǎn)：熱平衡理論　出處：《中國(guó)安全生產(chǎn)科學(xué)技術(shù)》2017年05期 　論文類型：期刊論文

【摘要】：為了研究低品質(zhì)煤炭堆積狀態(tài)下內(nèi)部自熱理論,采用臨界自燃著火點(diǎn)理論和Frank-Kamenetskii模型研究了煤堆內(nèi)部熱產(chǎn)生與熱散失平衡理論以及煤堆表面的換熱現(xiàn)象;并應(yīng)用設(shè)計(jì)研發(fā)的煤堆熱擴(kuò)散率及溫度監(jiān)測(cè)實(shí)驗(yàn)裝置和測(cè)定方法來(lái)評(píng)估低品質(zhì)煤樣(褐煤以及亞煙煤)臨界自燃溫度。結(jié)果表明:煤樣堆積狀態(tài)下臨界自燃著火點(diǎn)溫度可通過(guò)實(shí)驗(yàn)室內(nèi)測(cè)定分析不同體積網(wǎng)框在不同環(huán)境溫度條件下自熱曲線得出;同體積條件下,臨界自燃著火點(diǎn)隨著煤品質(zhì)的升高而增加;在140℃環(huán)境條件下,1#,2#和3#煤樣在快速升溫的前20 min內(nèi),溫度變化趨勢(shì)相似;在60~65℃,3種煤樣出現(xiàn)溫度轉(zhuǎn)折點(diǎn),升溫速率開(kāi)始減緩;根據(jù)煤樣臨界自燃著火點(diǎn)溫度結(jié)合F-K熱發(fā)火邊界條件理論得出的堆積體積與著火點(diǎn)耦合關(guān)系式可預(yù)測(cè)大體積煤樣自燃傾向性及臨界自燃溫度。
[Abstract]:In order to study the theory of internal self-heating under the condition of low quality coal accumulation, the theory of critical spontaneous combustion ignition point and Frank-Kamenetskii model are used to study the equilibrium theory of heat generation and heat dissipation in coal heap and the heat transfer phenomenon on the surface of coal heap. The critical spontaneous combustion temperature of low-quality coal samples (lignite and sub-bituminous coal) was evaluated by using the experimental apparatus and method of monitoring thermal diffusivity and temperature of coal pile designed and developed. The results show that the critical spontaneous ignition of coal sample is critical under the condition of coal sample accumulation. The point temperature can be obtained by measuring and analyzing the self-heating curves of different volume mesh frames under different ambient temperature conditions. Under the same volume condition, the critical spontaneous combustion ignition point increases with the increase of coal quality, the temperature variation trend of #2# coal samples is similar to that of coal samples in the first 20 min of rapid heating at 140 鈩，

本文編號(hào)：1584732