摘要
有研究表明,造成煤自燃根本原因是煤被氧化生产可燃的CO,当热能聚集引起CO燃烧导致煤体自燃。为了防止电厂煤仓,煤场中存煤自燃,造成经济损失和发生火灾事故。基于量子化学和自由基理论,通过试验方法模拟分析在不同的温度情况下,煤自燃生成的CO量,研究煤自燃过程中CO的形成机理。通过研究表明,当煤体温度在20~150℃时,CO生产速率小于364.84μg/min。但是随着煤体温度的不断升高,CO生产速率以几何指数的形式增长。这是因为随着温度提高,煤体中大量的有机分子键断裂产生大量自由基,这些自由基与O2发生氧化反应产生热量,热量蓄积进一步促进物理化学反应生成大量可燃CO。煤体不断氧化、放热、升温,反应进入快速阶段。可此可知,控制煤体自燃的最好时机是在第一个过程即煤中低分子化合物氧化过程。
Studies have shown that coal is the main reason for the spontaneous combustion of coal is oxidized to produce combustible CO, when the heat caused by CO combustion caused by coal combustion spontaneous combustion. In order to prevent the power plant coal bunker, coal field coal spontaneous combustion, resulting in economic losses and fire accidents. Based on the theory of quantum chemistry and free radicals , this paper simulates and analyzes the formation mechanism of CO in spontaneous combustion of coal under different tem-perature conditions. The results show that when the coal temperature is 20 -150℃ , CO produthan 364.84（jg/min. However , as the temperature of the coal body continues to rate grows in the form of geometric indices. This is because as the temperature organic molecules in the coal body break a lot of free radicals,these free radicals aproduce heat,heat accumulation to further promote the physical and chemical reactions to generate a largenumber of combustible CO. Coal constantly oxidized,exothermic,warming,reaction into the rapid phase. Itcan be seen that the best time to control the spontaneous combustion of coal is in the first molecular compound oxidation process.
出处
《电力科技与环保》
2018年第4期18-21,共4页
Electric Power Technology and Environmental Protection
关键词
煤自燃
自由基
温度
形成机理
spontaneous combustion of coal
radical
temperature
formation mechanism
作者简介
黄声和（1995-）,男,福建南平人,工程师,主要从事火电厂燃烧、检验方面的研究.E-mail：845184078@qq.com
