M701F3型燃气轮机燃烧振动大的解决方案

Solution to Large Combustion Vibration of M701F3 Gas Turbine

某电厂M701F3型燃气轮机的燃烧器在计划检修中已更换为修理品,在修后燃烧调整中出现了燃烧振动大、限制发电负荷的问题,影响企业效益。通过对燃烧调整全过程的跟踪判断,排除了压力波动监测系统、燃气轮机本体及其附属关联系统的影响,提出了大系统故障分析概念,扩展考虑联合循环机组各主机间变量的相互影响。分析表明,余热锅炉中压系统泄漏大、泄漏产生的噪音干扰、进气温度补偿函数未修正、调试方法简化是导致燃气轮机燃烧振动大的重要原因。通过消除余热锅炉泄漏点、加入进气温度补偿函数等措施,排除了噪声干扰,修正了蒸汽轮机负荷计算,进行了更精细的燃烧调整作业,从而使机组恢复了满负荷出力。

The combustor of M701F3 gas turbine of one power plant has been changed to the repaired combustor in the course of schedule maintenance,but some problems such as large combustion vibration and limit generation load occur in the process of combustion adjustment after the repair,which has affected benefit of the enterprise.Therefore,this paper presents the concept for fault analysis of the large system to extend consideration of interactive influences among variables of main units of the combined cycle unit by means of tracking judgement on the overall process of combustion adjustment and excluding influences of the pressure fluctuation monitoring system,the gas turbine and its auxiliary systems.Analysis indicates important reasons for large combustion vibration of the gas turbine include large leakage of the medium pressure system of the heat recovery boiler,noise interference produced by the leakage,uncorrected compensation function of inlet temperature and simplified commissioning method.By adopting measures of eliminating leakage points of the heat recovery boiler and adding compensation function,it excludes noise interference,corrects load calculation for the steam turbine and makes more precise combustion adjustment so as to recover full load output of the unit.