部件性能退化对燃气轮机运行状态的影响

1. 中国石油大学(北京)机械与储运工程学院;2. 中国石油天然气管道通信电力工程有限公司;3. 中石油管道有限责任公司

天然气管道;燃气轮机;性能退化;运行状态;优化

Effects of component performance degradation on the operating state of gas turbine
LI Shiyao1, LI Zhenlin1, WANG Ying2, CHEN Jianhong3

1. College of Mechanical and Transportation Engineering, China University of Petroleum (Beijing); 2. China Petroleum &Gas Pipeline Telecommunication & Electricity Engineering Corporation; 3. Petrochina Pipeline Company Ltd.

gas pipeline, gas turbine, performance degradation, operating state, optimization

备注

燃气轮机在运行过程中常常因压气机积垢、涡轮腐蚀及侵蚀等问题导致部件性能衰退,对整机运行状态造成消极影响。基于性能仿真模型,研究了用于天然气管道的LM2500+SAC 型燃气轮机的高压压气机、高压涡轮、动力涡轮等部件在等熵效率衰减和通流能力变化时,其高压压气机喘振裕度、最大允许输出功率及热循环效率的变化情况。仿真结果表明:高压压气机、高压涡轮等熵效率衰减均会导致燃气轮机最大允许输出功率明显下降,且热循环效率随之降低,但部件通流能力的变化对整机性能的影响较小;为双转子航改型燃气轮机配备具有可转导叶的动力涡轮后,通过增加其通流能力和燃料气供应量,能够有效提升处于亚健康状态机组的最大允许输出功率。研究结果可为故障部件定位和燃气轮机运行优化提供参考。(图 10表1,参[20]

Gas turbines often suffer compressor fouling, turbine corrosion and erosion during the operation, which lead to performance degradation of components and brings negative effect on the operating state of the engine. In this paper, the variations of the surge margin of high-pressure compressor, maximum allowable output power and thermal cycle efficiency were investigated based on the performance simulation model during the isentropic efficiency attenuation and flow capacity variation of high-pressure compressor, high-pressure turbine and power turbine of LM2500+SAC gas turbine used in gas pipelines. It is indicated that isentropic efficiency attenuation of high-pressure compressor and high-pressure turbine can lead to the significant reduction of the maximum allowable output power of gas turbine and correspondingly the thermal cycle efficiency decreases as well, but the change of the flow capacity of both components has less influence on the performance of the overall unit. Equipping a dual-rotor aeronautical modified gas turbine with power turbine which has adjustable vanes, the maximum allowable output power of the engine under sub-health state can be improved effectively by increasing its flow capacity and fuel supply. The research results provide the reference for the location of faulty components and the optimization of gas turbine operation. (10 Figures, 1 Table, 20 References)