摘要
热解是煤粉燃烧的第一步,热解生成的挥发分数量和成分对燃烧过程有重要影响;测量煤热解生成物成分较为复杂,且成本很高,热解建模和实验相结合,是研究热解生成物较为有效的方法。与煤的其它很多性质一样,煤的热解生成物也可由其成分预测:给出一种根据煤的元素含量和工业分析估算热解生成物主要成分的方法,热解生成物成分由物质能量守恒方程组描述,对方程组求解时,一些微量气体含量会因测量误差会出现不合理的解;用测量精度作为权值对方程两边的偏差平方和进行修正,将封闭方程组的求解转化为约束变量下偏差平方和的最小值问题,得到煤的主要热解生成物含量;对62个电厂的137个煤样进行热解计算,得到的主要热解气体含量随干燥无灰基挥发分变化的预测结果与实验值吻合良好。
Characteristics and quantity of volatile released in coal combustion significantly influence particles ignition as well as pollutants formation, measurements of such volatile components is difficult and expensive, consequently it is useful to examine these from a combination of devolatilization model with incomplete experimental data in CFD simulation and optimal boilers operation. Pyrolysis products characteristics, as well as a wide variety of properties such as calorific value, Hardgrove grindability index, can be predicted with the elemental analysis of coal. In this study, industrial analysis combined with elemental analysis of coal have been used to predict the component contents of volatile, which are modelled with the mass and energy conservation equations, but some trace component contents are often solved to unreasonable values due to the uncertainties of measurement. The measurement standard deviations were used as weights to modify bias squares of balance equations, converting solution of closed equations to the problem of minimum bias squares under the constraint variables, maximum likelihood solution of volatile component contents are presented. Calculation and analysis of 137 coal samples of 62 power plants shows that the predictions of the main combustible gas content are in good agreement with the experimental results.
出处
《电站系统工程》
2016年第5期11-14,共4页
Power System Engineering
关键词
煤
热解
元素分析
工业分析
coal
devolatilization
ultimate analysis
industrial analysis
