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Effect of high temperature and separated combustion on SO2 release characteristics during coal combustion under O2/CO2 atmosphere
Journal of the Energy Institute ( IF 5.6 ) Pub Date : 2020-07-25 , DOI: 10.1016/j.joei.2020.07.013
Xiaofeng Wu , Weidong Fan , Songlin Liu , Jun Chen , Hao Guo , Zhuang Liu

This paper studied the effect of high temperature (up to 1873K) and separated combustion mode (volatile combustion and char combustion are separated) on SO2 release characteristics during pulverized coal combustion under O2/CO2 atmosphere. Coal combustion experiments were conducted at different combustion environment temperatures utilizing a high temperature fixed-bed setup. The results show that as temperature rises, the SO2 release curve is transformed from a single-peak process to a double-peak process. In separated combustion, temperature has little effect on the volatile-SO2 (SO2 released during volatile combustion) but brings about a significant effect on char-SO2 (SO2 released during char combustion). Char-SO2 release amount and the ratio of it to fuel-SO2 release amount (total SO2 released during coal combustion) increase with temperature rising. The increase of temperature leads to a dramatic decreasing of sulphur mass fixed in the ash and causes SO2 release amount to rise when temperature is lower than 1573 K. Separated combustion causes a higher SO2 release amount than coupled combustion (the same as conventional combustion, volatile combustion and char combustion are simultaneous). Thermochemistry equilibrium composition calculation results show that alkali metals and alkaline-earth metals are significant in sulphur retention. CaSO4 and Na2SO4 are the main sulphates at high temperatures.



中文翻译:

O 2 / CO 2气氛下煤燃烧过程中高温和分开燃烧对SO 2释放特性的影响

本文研究了高温(高达1873K)和分离燃烧模式(挥发性燃烧和焦炭分离)对O 2 / CO 2气氛下煤粉燃烧过程中SO 2释放特性的影响。利用高温固定床装置在不同的燃烧环境温度下进行了煤燃烧实验。结果表明,随着温度的升高,SO 2释放曲线从单峰过程转变为双峰过程。在分离的燃烧,温度对挥发性-SO影响不大2(SO 2挥发性的燃烧过程中释放的),但带来了对char-SO一个显著效果2(在焦炭燃烧过程中释放出SO 2)。随着温度升高,Char-SO 2释放量及其与燃料-SO 2释放量的比(燃煤过程中释放的总SO 2)增加。温度的升高导致烟灰中固定的硫质量急剧下降,并在温度低于1573 K时导致SO 2释放量增加。单独燃烧比耦合燃烧产生更高的SO 2释放量(与常规燃烧相同) ,挥发燃烧和焦炭燃烧是同时发生的)。热化学平衡组成计算结果表明,碱金属和碱土金属的硫截留率显着。硫酸钙4和Na 2 SO 4是高温下的主要硫酸盐。

更新日期:2020-07-26
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