平朔煤和生物质混合焦的燃烧特性研究

Study of the Combustion Characteristics of the Blended Coke Produced by Using Pingshuo-originated Coal and Biomass

利用热重分析技术对不同掺混比例下的平朔煤和生物质混合焦的燃烧特性进行了实验研究,并考察了生物质掺混比例对混合焦燃烧过程的影响。结果表明,随着生物质掺混比例的增加,混合焦的着火温度和燃尽温度逐渐降低,而且其着火稳燃特性指数和燃烧特性指数也相应增大。当生物质掺混比例为70%时,混合焦的燃烧速率值最大,燃烧性能相对较好。同时,木屑焦和稻秸秆焦的活化能都要比平朔煤焦的小,而混合焦的活化能介于生物质焦和平朔煤焦之间,随着生物质掺混比例的增加,混合焦的活化能相应减小,说明掺混生物质能够促进混合焦的燃烧,改善混合焦的燃烧性能。

By employing the thermogravimetric analytic technology,the authors have conducted an experimental study of the combustion characteristics of the blended coke produced by using Pingshuo-originated coal and biomass at various mixing-dilution proportions with the influence of the mixing-dilution proportion of the biomass on the blended combustion process being investigated.The research results show that with an increase of the mixing-dilution proportion of the biomass,the ignition temperature and burn-out temperature of the blended coke will gradually decrease and the ignition stable combustion characteristic index and combustion characteristic index will increase accordingly.When the mixing-dilution proportion of the biomass attains 70%,the combustion speed of the blended coke will hit its maximum value and the combustion performance will be relatively good.In the meantime,the activated energy of the sawdust and rice-straw-produced coke will be lower than that of the coke produced by using Pingshuo-originated coal while that of the blended coke will be between that of the biomass-produced coke and that of Pingshuo-originated coal-produced coke.With an increase of the mixing-dilution proportion of biomass,the activated energy of the blended coke will decrease accordingly,indicating that the mixing and dilution of the biomass can accelerate the combustion of the blended coke and improve its combustion performance.