Study on corrosion prevention and control of the furnace of a 350 MW opposite-firing boiler burning high-alkali coal
In order to reduce fuel procurement costs and ensure fuel supply,a certain power plant in Gansu burns a large proportion of Xinjiang high-alkali Guanghui coal and Xinjiang Energy coal.After burning the high-alkali coal,the boiler experiences severe high-temperature corrosion and coking on the heating surface,and the maximum load can only be carried to 85％ECR.In order to reduce high-temperature corrosion,research has been conducted on coal quality characteristics,combustion optimization adjustment,and equipment improvement technology for boilers.The research results show that,the boiler still experiences severe high-temperature corrosion even when burning low sulfur coal,which is mainly related to the high content of alkali metals such as sodium and calcium,as well as chlorine in Xinjiang coal.By increasing oxygen content,reducing primary air volume,weakening the swirling strength of outer secondary air of the burner,and increasing wall-attached air,operation adjustment measures can improve the high-temperature corrosion characteristics of the water wall to some extent.But to completely solve this problem,it is necessary to start with the use of additives,high-temperature corrosion prevention spraying,adding soot blowers,improving wall-attached air and burner design,and other corresponding technologies.The results of this study can provide useful reference and guidance for power plants that encounter similar problems during the process of high-alkali coal burning.
high-alkali coalmixed burninghigh temperature corrosionprevention
国家科技期刊平台
NSTL
万方数据
维普
