CAJ | 학술논문

针对某电厂超临界运行锅炉垂直水冷壁出口处出现多处裂纹导致锅炉停运的问题,借助锅炉相关运行参数曲线对裂纹的位置、产生原因及外貌特征进行了研究,研究发现:锅炉垂直水冷壁出口处裂纹是由管间较大温差和管温快速变化产生的热应力引起的,管间较大温差一般出现在锅炉转干态后的低负荷工况下,且锅炉给水流量的变化与垂直水冷壁管温的波动存在对应关系;建议尽量减少该型锅炉在转干态后的长期低负荷运行,同时加强对垂直水冷壁出口处壁温的监视,出现较大偏差时及时调整;改进给水自动和给煤自动对水煤比的调整能力,防止负荷变化过程中的水煤比失调.
침대모전엄초림계운행과로수직수랭벽출구처출현다처렬문도치과로정운적문제,차조과로상관운행삼수곡선대렬문적위치、산생원인급외모특정진행료연구,연구발현:과로수직수랭벽출구처렬문시유관간교대온차화관온쾌속변화산생적열응력인기적,관간교대온차일반출현재과로전간태후적저부하공황하,차과로급수류량적변화여수직수랭벽관온적파동존재대응관계;건의진량감소해형과로재전간태후적장기저부하운행,동시가강대수직수랭벽출구처벽온적감시,출현교대편차시급시조정;개진급수자동화급매자동대수매비적조정능력,방지부하변화과정중적수매비실조.
Aiming at the outage of the supercritical boiler caused by several cracks at the vertical water wall outlet in a power plant, this paper studied the location of cracks, reasons for the cracks and characteristics of the appear-ance according to the related operation parameter curves of boilers. The result shows that the cracks at the vertical water wall outlet are caused by the thermal stress due to the wide temperature difference among pipes and the rapid change of pipe temperature. The temperature difference among pipes becomes wide under the low load working con-dition after the boiler transferring to dry state, the change of boiler feed-water flow relating to the fluctuation of vertical water wall pipe temperature. Long term low -load operation of boiler transferring to dry state should be shortened, while wall temperature of vertical water wall pipe outlet should be monitored to regulate in time when wide deviation occurs. The regulation of automatic feed-water and feed-coal on coal-water ratio should be im-proved to prevent the imbalanced ratio during the change of load.