某工业型燃气轮机箱装体冷却结构优化设计

Optimization Design of Cooling Structure for the Industrial Gas Turbine Case Module

中文关键词: 燃气轮机  箱装体  温度场  冷却结构

英文关键词: gas turbine  case module  temperature field  cooling structure

中文摘要:

      燃气轮机在全封闭的箱装体中运行时,机匣辐射及法兰处泄漏的热空气会使箱装体内温度急剧升高,而使用双燃料系统时,按照防爆等级要求,附属设备和元件的工作温度不能超过75℃,因此有必要对箱装体进行有效的冷却。对某型燃气轮机在箱装体中的实际运行状态进行数值模拟,并与试验值和场站运行记录进行对比,验证数值模拟方法的准确性,证明现有冷却结构不能满足要求。提出多种冷却结构的优化方案并进行数值模拟,结果表明：分支结构不但可以有效解决箱体内超温的问题,而且可以将冷却空气流量减少29%,将底板附近空气速度减小33%,可在大幅减少对能源的消耗的同时提高底板附近零部件的使用寿命。

英文摘要:

      Temperature in case module increases fleetly as the radiation of casing and hot-air leaking from flange when gas turbine operating on full work condition in totally-enclosed case module. According to the requirements of anti-hazard classification, working temperature of accessory equipments and components couldn"t exceed 75 ℃ when using dual fuel system. So it is necessary to conduct effective cooling for case module. Numerical simulation has been done for the industrial gas turbine in case module under actual running state, as well as comparison with experiment data and operation records in locale has been done to verify the veracity of numerical simulation method. Results show that the current cooling structure couldn"t satisfy the equipments. Some optimization design has been put forward and numerical simulation has been done in this paper. The results show that: branch structure could solve the over-temperature problems in case module effectively and mass flow of cooling air could be decreased 29%, as well as velocity value of air near base plate could be reduced 33%. This structure could reduce depletion of resources markedly and improving service life of components near base plate.