O_2/CO_2气氛下煤燃烧产物的热力学分析

A Thermodynamic Analysis of Coal Combustion Products in O_2/CO_2 Atmosphere

利用ASEPN PLUS软件平台对O2/CO2气氛下煤的燃烧产物进行了热力学模拟计算,计算中对煤在O2/CO2气氛下和空气中的燃烧产物进行了对比,研究在O2/CO2气氛下燃烧温度、过量氧系数φ对煤燃烧产物的影响。结果表明,煤在O2/CO2气氛下燃烧,形成的NOx量远低于空气气氛中的生成量;随温度和φ增大,NOx量增大;温度对SO2和SO3量的生成影响很小;当φ<1时,随φ增大SO2的量增大,当φ>1时,φ变化对SO2量影响不大;随φ增大,SO3有微量增长。计算表明应用ASPEN PLUS模拟煤的富氧燃烧是可行的。

By using ASPEN PLUS software platform, a thermodynamic simulation calculation has been conducted of coal combustion products in O2/CO2 atmosphere. During the calculation, a comparison has been made of the coal combustion products in O2/CO2 atmosphere with those in air. A study has also been performed of the impact of the combustion temperature and excess oxygen factor φ in O2/CO2 atmosphere on the combustion products of coal. The results of the study show that NOx amount produced from coal combustion in O2/CO2 atmosphere is far less than that produced in air. With an increase of temperature and φ, NOx amount will increase. The temperature has a very small influence on the formation of SO2 and SO3 amount. When φ is less than 1, SO2 amount will increase with an increase of φ. When φ is greater than 1, the change of φ will have little influence on the formation of SO2 amount, and SO3 amount will slightly increase with an increase of φ. The calculation data are basically in agreement with the test results available from current literature. This shows that using ASPEN PLUS software to simulate coal combustion in a rich oxygen atmosphere is a feasible approach.