摘要
为解决电厂锅炉在燃用准东煤过程中受热面结焦问题,提出在受热面易结焦部位喷涂纳米陶瓷涂层的方案。基于图像分析方法,对煤灰熔滴与试样钢片的接触角与喷涂前后煤灰熔渣试样的元素成分进行测定,分析了纳米陶瓷涂层对试样钢片表面结焦的影响机理,并在某660 MW燃煤发电机组3号锅炉上进行喷涂工程应用,重点对喷涂前后炉膛结焦、锅炉效率、炉膛温度、吹灰器投运、NO_(x)排放等进行了对比分析。结果表明:纳米陶瓷材料涂层对煤灰熔滴的黏附能力存在削弱作用,且能够有效防护钢基体表面,具备良好的防结焦性能;喷涂纳米陶瓷涂层后,锅炉各项性能指标明显提升,水冷壁管壁温度最高由670℃降低为526℃,炉膛温度降低30~60℃,炉膛排烟温度降低9.5℃,锅炉效率提升约0.63%;吹灰器投运时长下降58.2%,NO_(x)排放量降低13.7%。纳米陶瓷涂层能够较好地解决炉膛受热面结焦问题,可为燃用准东煤锅炉结焦防治工程提供依据。
In order to solve the problem of slagging on heating surface of power plant boilers in the process of burning Zhundong coal,a scheme of spraying nanoceramic coating on slagging part of the heating surface was proposed.Based on the image analysis method,the contact angle between the coal ash melting droplet and the sample steel sheet as well as the element composition of the coal ash slag sample before and after the spraying were measured,and the influence mechanism of nano ceramic coating on the surface slagging of the sample steel sheet was analyzed.Moreover,the No.3 boiler of a 660 MW coal-fired power unit was sprayed using this scheme.The factors such as furnace slagging,boiler efficiency,furnace temperature,soot blower operation and NO_(x) emission before and after the spraying were compared and analyzed.The results show that,the nano ceramic coating had a weakening effect on the adhesion ofcoal ash melting droplets,and could effectively isolate and protect the surface of the rigid substrate,which had a good anti slagging performance.After spraying the nano ceramic coating,the performance indexes of the boiler were obviously improved,the highest temperature of the water wall reduced from 670℃to 526℃,the furnace temperature reduced by 30~60℃,the exhaust temperature decreased by9.5℃,and the boiler efficiency increased by about 0.63%.The operation time of soot blower shortened by 58.2%,and the NO_(x) emission mass concentration reduced by 13.7%.This study shows that nano ceramic coating can solve the problem of furnace heating surface coking,which provides a certain guidance for slag prevention project of Zhundong coal-fired boilers.
作者
王天龙
贾永会
汪潮洋
李欣
张勇胜
WANG Tianlong;JIA Yonghui;WANG Chaoyang;LI Xin;ZHANG Yongsheng(State Grid Hebei Energy Technology Service Co.,Ltd.,Shijiazhuang 050000,China;Electric Power Research Institute of State Grid Hebei Electric Power Co.,Ltd.,Shijiazhuang 050000,China)
出处
《热力发电》
CAS
CSCD
北大核心
2022年第2期192-198,共7页
Thermal Power Generation
基金
国家电网公司科技项目(TSS2020-17)。
关键词
纳米陶瓷
涂层
沾污
结焦
准东煤
排烟热损失
锅炉效率
nano ceramic
coating
fouling
slagging
Zhundong coal
heat loss due to exhaust gas
boiler efficiency
