As an efficient energy conversion system,the combined cycle power plant (CCPP)is widely used in such industrial fields as iron and steel. As the core component of CCPP,stable operation of waste heat boiler directly affects effi-ciency and safety of the entire unit. In the paper,the in-depth study aiming at frequent leak problem at the upper part of high pressure evaporator of supporting waste heat boiler facing flue gas in gas turbine unit of a steel plant is carried out as well as the leakage causes are analyzed to be that the deposit sediment in its lower header causes water flow rate in evapora-tor tube to be decreased so that impingement corrosion of steam water mixture is generated. Meanwhile,the phenomenon of"flue gas corridor"in local area of furnace exacerbates the corrosion process. For these problems,such measures as repla-cing leaking pipe section,reforming periodic discharge pipe system of lower header to improve efficiency of pollution dis-charge,repairing and perfecting gas baffle to reduce formation of"flue gas corridor",optimizing periodic pollution dis-charge operations as well as formulating periodic plans of inspection and maintenance are taken to effectively solve the leak problem for high pressure evaporator so that the stability and safety of equipment are improved.
关键词
燃气-蒸汽联合循环机组/余热锅炉/高压蒸发器/泄漏分析/处理方案
Key words
combined cycle power plant/waste heat boiler/high pressure evaporator/analysis of leakage/treatment scheme
维普
万方数据