大型CFB锅炉低负荷再热汽温稳定特性研究 杨中智.pdf

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洁净煤技术 CFB 锅炉灵活性运行亟
待解决的问题之一。通过针对两台 350MW 超临界 CFB 锅炉断煤低负荷运行工况参数进行深入的计算分析，
研究了低负荷时稳定再热汽温的措施。研究发现，锅炉在部分给煤点中断的断煤工况下运行时，床温、
炉膛出口烟温、炉膛出口氧量、高温再热器管屏出口蒸汽温度的变化趋势与各给煤口的给煤量基本呈正
相关的关系。但由于超临界 CFB 锅炉水冷壁具有正的流动响应特性，给煤偏差以及床温偏差对水冷壁的出
口汽温偏差影响不大。基于上述研究，提出了一种针对长期调峰与低负荷运行超临界 CFB 锅炉稳定炉内高
温再热器出口汽温的锅炉改造与运行优化技术方案。在低负荷下可保证高温再热器出口汽温的基本稳定。
关键词：超临界循环流化床锅炉；高温再热器；低负荷；蒸汽温度；断煤
中图分类号：TK227 文献标志码：A
Study on the stability characteristics of reheat steam temperature of
large-scale CFB boilers at low load
YANG Zhongzhi1，LU Xiaofeng1，JUE Jiayi2，MENG Baosheng2，WANG Pengcheng3
(1. School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China; 2. Geely Baikuang Group Co., Ltd., Guangxi, 533099, China;
3. Shanxi Hepo Power Plant Co., Ltd., Shanxi 045000, China)
Abstract: As one of the key process of flexible power generation, long-term stable low load operation technology
plays an important role in the continuous expansion of renewable energy grid connection. In the process of load
regulation of circulating fluidized bed (CFB) boiler, it was very common to adopt the operation mode of uneven
coal feeding in order to reduce pollutant emissions or adjust bed temperature, and this mode put forward higher
requirements for the design and operation of CFB boilers. At the same time, the flue gas temperature of CFB boiler
was low at low load. How to ensure that the steam parameters reach the rated value was one of the urgent problems
to be solved to realize the flexible operation of CFB boiler. The parameters of two 350MW su