摘要
当前电厂在低温省煤器的稳定运行上面临较大的压力,尤其是低温省煤器的泄漏问题亟待解决。为实现低温省煤器泄漏的快速检测,防止其运行恶化,可利用低温省煤器后烟气温度变化实现快速检漏。通过COMSOL对低温省煤器泄露后的烟气温度变化进行数值模拟发现,与无泄漏相比,泄漏发生后烟气温度降低可达2℃,同时烟道内低温区域扩大。因此,可在低温省煤器后整个烟道截面上矩阵式布置多个温度测点,监测不同测点烟气温度或同一测点烟气温度的变化速率和变化幅度,即可快速判断低温省煤器是否发生泄漏,再配合水侧压力测试即可实现快速检漏。在低温省煤器设计、运行、检修3个方面给出具体建议,对电厂低温省煤器运行稳定性的提高具有显著的工程指导意义。
The power plant is facing great pressure on the stable operation of low-temperature economizer,especially its leakage problem needs to be solved urgently.In order to detect the leakage of low-temperature economizer instantly,this paper proposes a rapid leakage detection technology based on the flue gas temperature monitoring after low-temperature economizer.Through the numerical simulation of the flue gas temperature change after the leakage of low-temperature economizer by COMSOL,it is found that the flue gas temperature after the leakage point can be reduced by 2℃compared with the normal flue gas temperature.Thus,by arranging multiple temperature measuring points on the whole flue section behind the low-temperature economizer in a matrix manner,monitoring the temperature at different points or the temperature change rate and amplitude at the same point,we can quickly determine whether the low-temperature economizer has leakage,and then cooperate with the water side pressure test to achieve rapid leakage detection.In addition,this paper also gives specific suggestions from the design,operation and maintenance of low-temperature economizer,which has significant engineering significance for improving the operation stability of low-temperature economizer in power plants.
作者
雷雨
王勃
张知翔
薛宁
姬海民
LEI Yu;WANG Bo;ZHANG Zhixiang;XUE Ning;JI Haimin(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 7100541,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2024年第S02期456-460,共5页
Clean Coal Technology
基金
西安热工研究院有限公司众创/研究开发基金资助项目(TD-22-TYK22)
关键词
低温省煤器
泄露
快速检测
烟气温度
水侧压力
low temperature economizer
leakage
rapid detection
flue gas temperature
water side pressure
作者简介
雷雨(1991—),男,山东泰安人,工程师。E-mail:leiyu@tpri.com.cn;通讯作者:张知翔(1986—),男,山西运城人,高级工程师。E-mail:421232155@qq.com
