基于量子化学和自由基温度煤自燃CO形成机理研究
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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 temperature conditions. The results show that when the coal temperature is 20 ~ 150 ℃,CO production rate is less than 364. 84 μg/min. However,as the temperature of the coal body continues to increase,the CO production rate grows in the form of geometric indices. This is because as the temperature increases,a large number of organic molecules in the coal body break a lot of free radicals,these free radicals and O2 oxidation reaction to produce heat,heat accumulation to further promote the physical and chemical reactions to generate a large number of combustible CO. Coal constantly oxidized,exothermic,warming,reaction into the rapid phase. It can be seen that the best time to control the spontaneous combustion of coal is in the first process that coal low molecular compound oxidation process.
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 temperature conditions. The results show that when the coal temperature is 20 ~ 150 ℃,CO production rate is less than 364. 84 μg/min. However,as the temperature of the coal body continues to increase,the CO production rate grows in the form of geometric indices. This is because as the temperature increases,a large number of organic molecules in the coal body break a lot of free radicals,these free radicals and O2 oxidation reaction to produce heat,heat accumulation to further promote the physical and chemical reactions to generate a large number of combustible CO. Coal constantly oxidized,exothermic,warming,reaction into the rapid phase. It can be seen that the best time to control the spontaneous combustion of coal is in the first process that coal low molecular compound oxidation process.
引文
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[2]李文学,张东杰,黄宣.配煤掺烧比对发电厂综合成本影响的定量分析和优化计算[J].电力科技与环保,2016,32(1):50-54.
[3]戚绪尧.煤中活性基团的氧化及自反应过程[D].徐州:中国矿业大学.2011.
[4]肖旸,吕慧菲,邓军.煤自燃组化机理及其技术的研究发展[J].安全与环境工程,2017,31(10):176-188.
[5]邓军,宋佳佳,赵婧昱.高温氧化条件下风化煤自燃特性实验研究[J].煤炭科学技术,2017,45(1):73-77.
[6]汪后港,张磊,陆超.煤场储煤氧化温升特性试验研究[J].中国煤炭,2017,43(5):128-131.
[7]王继仁,金智新,邓存宝.煤自燃量子化学理论[M].北京:科学出版社.2007.
[8]Singh R.N,Shonharvt J A.A new imension to studies of spontaneous cmbustion of coal.Minerial Resources Engineering,2002,11(2):147-163.
[9]Muthusany Karthikeyyan.Minimization of moisture readsorption in driecl coal samples[J].Prying Technology,2008(26):950-955.
[10]王继仁,金智新,邓存宝.煤自燃量子化学理论[M].北京:科学出版社,2007.
[11]Mahidin,Hiromoto Usui,and Singo Ishikanwa.The evaluation of spontaneous combustion characteristics and properties of raw and upgraded indonesian low rank coals[J].Coal Preparation,2002(22):85-91.
[12]宋万新,杨胜强,蒋春林,等.含瓦斯风流条件下煤自燃产物CO生成规律的实验研究[J].煤炭学报,2012,37(8):1322-1324.
[13]王兰云,蒋曙光,卲昊,等.煤自燃过程中自氧化加速温度研究[J].煤炭学报,2011(6):989-990.
[14]许涛,王德明,辛海会,等.煤低温恒温氧化过程反应特性的实验研究[J].中国安全科学学报,2011(9):113-115.
[15]李曼,李增华,杨永良,等.自燃发火实验测定煤低温氧化活化能[J].煤炭技术,2012(6):75-77.