摘要
在Pyris-1 TGA热重分析仪上进行了桦甸油页岩半焦和当地玉米秸秆不同掺混比例的燃烧实验,对各样品的混烧反应机制进行了理论研究。基于TG-DTG燃烧失重曲线,整个燃烧过程可分为燃烧低温段、过渡段、高温段3个阶段。不同燃烧段中样品的燃烧释放性指数随着玉米秸秆掺入比例的增加呈现增大趋势,结果表明燃烧低温段的燃烧释放性指数为最大。应用绝对反应速率理论,对各样品不同燃烧段的活化焓和活化熵进行计算。结果表明随着玉米秸秆掺入比例的增加,各样品过渡段和高温段的活化焓值均高于低温段;各样品的熵值在3个燃烧阶段依次降低。综合各燃烧特性参数,发现随着玉米秸秆掺入比例的增加,燃烧反应加剧,燃烧反应段前移,明显改善桦甸油页岩半焦的燃烧特性。
A series of combustion experiments for Huadian oil shale semi-coke, corn stalks as well as their mixture was conducted by the Pyris-1 TGA thermogravimetric analyzer. Theoretical study on co-combustion mechanism of various samples was investigated. Based on the TG-DTG curves, the whole combustion process was divided into three combustion reaction stages, that is, low-temperature stage, transition and high-temperature stage. A study on combustion release index of different samples was analyzed under different combustion stages. The results reveal that there is a tendency to increase for the release index with increasing the ratio of the corn stalks. And the release index of the samples is maximum in the low-temperature stage. Furthermore, the activation enthalpy and activation entropy were respectively calculated based on absolute reaction rate theory. The results show that with increasing the ratio of the cornstalks, the activation enthalpy on the transition and high-temperature stage get higher than the low-temperature stage, and the activation entropy from the three stages decreases in turn. Finally, referred to combustion characteristic parameters, it can be observed that with the addition of cornstalk ratio, the combustion reaction stages move forward and combustion features of Huadian oil shale semi-coke can obviously get improved.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2013年第5期28-34,6,共7页
Proceedings of the CSEE
基金
国家潜在油气资源(油页岩勘探开发利用)产学研用合作创新建设项目(OSR-05)~~
关键词
油页岩半焦
玉米秸秆
热重分析
绝对反应速率理论
活化焓
活化熵
oil shale semi-coke
corn stalks
thermogravimetric analyzer
absolute reaction rate theory
activation enthalpy
activation entropy
