135 MW循环流化床锅炉纯燃准东煤改造策略与运行技术研究
摘要：准东煤属于高碱金属煤质，含有的大量钠钾金属在高温炉膛内容易导致沾污和结渣问题，影响锅炉的正常运行。针对新疆某2×135 MW循环流化床(circulating fluidized bed，CFB)锅炉在燃烧准东煤实际运行过程中的结渣现象，通过机理分析，提出了相应的改造方案及运行技术：提高分离器入口烟速，以提高分离效率、增加循环倍率；增加炉膛屏式受热面积，结合分离器的提效改造共同实现炉膛降温；掺烧煤粉炉灰渣稀释碱金属含量，以降低碱金属硫酸盐生成。经优化改造后，目标锅炉在原定负荷下重新投产运行约8个月，通过与改造前运行效果的对比可知：目标锅炉在高效率、低成本纯燃准东煤的同时，沾污和结渣问题得到了大幅改善，验证了技术方案的可行性，也为其他准东煤利用工程项目提供了参考。
Abstract:Zhundong coal is rich of alkali metals, and coal ash contains large amounts of Na and K element, which can easily lead to slagging and contamination problems, and affect the normal operation of the boiler. This paper focused on the slagging characteristics of the 2×135 MW circulating fluidized bed (CFB) boilers in the actual operation burning Zhundong coal, and proposed the corresponding renovation plan and operation technology through mechanistic analysis. The results show that increasing the gas velocity at the separator inlet can improve the separation efficiency and circulating rate; increasing the area of platen heating surface and improving the efficiency of separator help to achieve the cooling of the furnace chamber; diluting alkali metal content with pulverized coal boiler ash can reduce the formation of alkali metal sulfate. After the optimization, the target boiler was put back into operation at the original load for about 8 months. The comparison with the operation effect before modification shows that the staining and slagging problems are significantly improved while burning pure Jundong coal at high efficiency and low cost, which verifies the feasibility of the proposed technical solution and also provides a reference for other Jundong coal utilization engineering projects.
标题：135 MW循环流化床锅炉纯燃准东煤改造策略与运行技术研究
title:Retrofitting Strategy and Operating Technology of Pure Burning Zhundong Coal in a 135 MW Circulating Fluidized Bed Boiler
作者：王洪健, 王海洋, 孔皓, 周托, 张缦, 杨海瑞
authors:Hongjian WANG, Haiyang WANG, Hao KONG, Tuo ZHOU, Man ZHANG, Hairui YANG
关键词：循环流化床(CFB)锅炉,准东煤,沾污,结渣,分离器提效,
keywords:circulating fluidized bed (CFB) boiler,Zhundong coal,contamination,slagging,cyclone efficiency improvement,
发表日期：2022-12-31
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