【摘要】：為研究不同變質(zhì)程度煤塵云最小點火能特性及其影響因素,選取7種不同變質(zhì)程度煤塵,采用哈特曼管試驗系統(tǒng),測試不同煤塵云質(zhì)量濃度c、著火延遲時間t、噴粉壓力P下最小點火能E.研究結(jié)果表明:不同變質(zhì)程度煤塵云E值間存在明顯界限,變質(zhì)程度越高,E越大.在同等粒度下,受煤塵顆粒著火氧化速度限制,最佳點火質(zhì)量濃度隨變質(zhì)程度增高而減小.隨t增大,E呈先下降后上升趨勢,最佳著火延遲時間在1 s附近,且t比c對褐煤E值影響作用偏大.無煙煤P與E關系曲線呈"漏斗型",最佳噴粉壓力隨變質(zhì)程度降低而減小.建立c、t、P耦合條件下無煙煤E的數(shù)學模型,由此確定的最佳測試工況(c,t,P)考慮了因素間關聯(lián)性,理論上比單因素分析結(jié)果更接近真實情況.
[Abstract]:In order to study the minimum igniting energy and its influencing factors of coal dust cloud with different degrees of metamorphism, seven kinds of coal dust with different degrees of metamorphism were selected, and Hartmann tube test system was used to measure the mass concentration of different coal dust clouds c, and the ignition delay time t. The minimum ignition energy E _ (E) under powder injection pressure P. The results show that there is an obvious boundary between E values of coal dust clouds with different metamorphism, and the higher the metamorphic degree is, the greater the E is. At the same particle size, the optimal ignition mass concentration decreases with the increase of the degree of metamorphism, which is limited by the rate of ignition and oxidation of coal dust particles. With the increase of t, E decreased first and then increased, the best ignition delay time was about 1 s, and t / c had a great effect on E value of lignite. The relation curve between P and E of anthracite is "funnel-type", and the optimum injection pressure decreases with the decrease of metamorphic degree. The mathematical model of anthracite E is established under the coupling condition of cu / t / P, and the optimum test condition (CP), which takes into account the correlation between factors, is closer to the real situation in theory than that of single factor analysis.
【作者單位】： 遼寧工程技術大學安全科學與工程學院;礦山熱動力災害與防治教育部重點實驗室(遼寧工程技術大學);
【基金】：國家自然科學基金(51204089) 遼寧省教育廳科研項目(L2014131) 遼寧省自然科學基金(201602355)
【分類號】：TD714

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1 陳斌;硫化礦粉塵云最小點火能試驗研究[D];江西理工大學;2016年

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