摘要
在0.4 MW准东煤燃烧与沾污试验台上进行了3种不同添加剂对某准东煤燃烧时结渣、沾污特性影响的研究。结果表明:炉膛内和蛇形管前屏只存在结渣现象,结渣物是以Fe、Ca为主形成的低熔点复合盐类,而Na对结渣贡献并不占主要地位;各工况的准东煤真实灰熔点在1 100℃左右;烟温在800℃左右时受热面以沾污为主,Na_2SO_4和CaSO_4的冷凝沉积占主导;准东煤自身燃烧产生的底渣作为添加剂时缓解结渣、沾污效果不明显;添加高岭土时结渣物虽较厚但较为疏松,易于清除,说明其具有明显的减弱结渣强度的作用;以将军庙煤为添加剂时能明显减弱沾污强度。
Slagging and fouling characteristics of Zhundong coal with 3 different additives were studied in a0.4 MW test rig.Results show that there exists only slagging phenomenon in the furnace and on the front screen of serpentine tube,mainly in the form of low-melting-point compound salts containing Fe and Ca,etc.,while Na doesn＇t dominate the slagging process.The melting point of Zhundong coal ash is about1 100℃ under test conditions.Fouling phenomenon occurs on the heating surface,mainly in the pattern of condensation deposition of Na2SO4 and CaSO4 at the flue gas temperature of 800 ℃.When Zhundong coal slag is used as an additive,the inhibiting effect on slagging and fouling is not obvious;whereas when kaolin clay is used as an additive,the slagging layer would be thicker,but looser,and therfore is easy to remove,showing an obvious effect in reducing slagging severity;when the General Temple coal is taken as an additive,it can obviously weaken the fouling severity.
作者
何翔
施鸿飞
周文台
马达夫
金晶
HE Xiang;SHI Hongfei;ZHOU Wentai;MA Dafu;JIN Jing(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Power Equipment Research Institute Co.,Ltd.,Shanghai 200240,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2018年第9期689-694,705,共7页
Journal of Chinese Society of Power Engineering
基金
国家科技支撑课题资助项目(2015BAA04B01)
国家电力投资集团课题资助项目(2015-227-XJN-KJ-X)
关键词
准东煤
添加剂
结渣
沾污特性
碱酸比
Zhundong coal
additives
slagging
fouling characteristics
alkali/acid ratio
