摘要
以粉煤灰改性钙基吸收剂作为研究对象,考察流化时间、颗粒粒径、煅烧温度、流化风速以及煅烧气氛对其磨损特性的影响,并与石灰石的磨损特性进行比较。结果表明:吸收剂颗粒磨损率随时间增加而减小;起始粒径、流化风速越大,磨损越严重,但磨损3h后粒径对吸收剂颗粒磨损特性的影响几乎可以忽略。吸收剂颗粒在起始的10min,950℃煅烧温度下的磨损程度要比850℃时严重,但随着时间延长,850℃下的吸收剂颗粒磨损程度反而要比950℃时严重。吸收剂颗粒在CO_2煅烧气氛下的磨损程度要比空气煅烧气氛下轻微,高浓度CO_2环境下抑制了煅烧反应的进行,某种程度上减弱了其磨损作用。粉煤灰改性钙基吸收剂颗粒的抗磨损能力明显较石灰石颗粒的强。
Sorbent particles modified by fly-ash are chosen as experimental samples. Effects of calcination time, particle size, calcination temperature, air velocity and calcination atmos- phere on attrition of sorbents are studied. A comparison is made between modified sorbent and limestone in attrition properties. The results show that the attrition rate of sorbent parti- cle decreases with time. The greater the particle size and air velocity is, the more serious the particle attrition is presented. The effect of particle size on attrition can be neglected after 3 h calcination. In the initial 10 min, the attrition is more severe at 950℃ than that at 850℃ during calcination. With calcination time prolonged, the attrition of sorbent is more severe at 850℃ than 950℃ inversely. Attrition of sorbent particle is moderate in the CO2 atmosphere compared with that in the air atmosphere. High CO2 concentration hindering the calcination of sorbent leads to moderate the particle attrition. The sorbent particle modified with fly ash presents stronger attrition resistance than that of limestone.
出处
《锅炉技术》
北大核心
2016年第1期74-79,共6页
Boiler Technology
基金
国家自然科学(青年)基金(51206024)
关键词
粉煤灰
煅烧
磨损
粒径分布
fly-ash
calcination
attrition
size distribution
