除渣系统选择的若干问题探讨

干式除渣系统会对结渣及锅炉效率产生影响。通过对煤种结渣性及锅炉效率影响因素的分析,提出了减少干式除渣系统对结渣及锅炉效率产生负面影响的措施;与此同时分析了结渣性煤种对湿式除渣系统的影响。研究认为,降低锅炉结渣,应重视炉膛设计、换热器布置、燃烧运行管理等多方面因素;对于结渣性煤种,无论是干式还是湿式除渣系统,均需采取有效措施保证自身系统安全可靠运行,减少对锅炉燃烧的不利影响;除渣系统的选取应遵循DL/T5142《火力发电厂除灰设计技术规程》要求合理选择,不能单纯因为锅炉燃用易结渣性煤种而放弃选择干式除渣系统。

Discussion of Bottom Ash Handling System Selection

The dry bottom ash handling system affects the slagging and boiler efficiency. This paper analyzes the influencing factors of the slagging and boiler efficiency and proposes the measures to reduce the negative effects of the dry bottom ash handling system. Meanwhile the effects of slagging property coal on the wet slag system are analyzed. The study indicates that more attention should be paid to the furnace design, heat exchanger arrangement and combustion management to avoid boiler slagging. For boilers burning easy slagging property coal, effective measures should be taken to ensure the safe operation of the bottom ash handling system, whether dry or wet, and reduce the negative impacts on boiler combustion. The selection of the bottom ash handling system should follow the DL/T5142 Technical Code for the Design of Ash Handling System of Fossil-Fired Power Plant and the combustion of easy slagging property coal should not be the only reason for abandoning the dry bottom ash handling system.