闭式布雷顿循环发电系统热力过程建模及其参数影响研究

Thermodynamic Process Modeling and Parameter Influence of Closed Brayton Cycle Power Generation System

关键词:  闭式布雷顿循环  发电系统  热力过程  参数建模  可用灵敏度分析

Key words:  Closed Brayton cycle  Power generation system  Thermodynamic process  Parameter modeling  Available sensitivity analysis

摘要:

针对闭式布雷顿循环发电系统热力循环过程及其参数影响，开展系统的热力过程参数建模研究，建立系统发电功率、比功率和效率的计算模型；在此基础上，研究闭式布雷顿循环发电系统比功率和效率随涡轮入口总温及效率、压气机入口总温、压气机压比及效率、累积总压恢复系数等的变化规律，考虑参数灵敏度及其优化潜力，提出可用灵敏度并对系统的比功率和效率进行灵敏度分析。研究表明，闭式布雷顿循环发电系统的比功率和效率随涡轮入口总温及效率、压气机压比及效率、系统累积总压恢复系数等参数的增大而增高，随压气机入口总温的增大而减小。在压气机入口总温、压比与效率、涡轮入口总温及效率、累积总压恢复系数等主要热力参数中，系统比功率灵敏度最高的参数为涡轮效率，系统效率灵敏度最高的参数为压气机压比。考虑参数的实际优化潜力，在循环工质一定的条件下，系统比功率可用灵敏度最高的参数为涡轮入口总温，系统效率可用灵敏度最高的参数为压气机压比。

Abstract:

For the thermodynamic process and parameter influence of closed Brayton cycle power generation system， the system thermodynamic process parameters modeling is studied， and the mathematical models of system power generating capacity， specific power and efficiency are developed. Then， the influence rules that the parameters including total turbine inlet temperature， turbine efficiency， total compressor inlet temperature， pressure ratio， compressor efficiency and total pressure recovery coefficient affect the specific power and efficiency of closed Brayton cycle power generation system， are studied. Taking the sensitivity and optimization potential of parameters into accounted， the available sensitivity is proposed， and the sensitivity analysis of specific power and efficiency of closed Brayton cycle power generation system is done. The results show that the power generating capacity and efficiency of closed Brayton cycle power generation system increase as the increase of total turbine inlet temperature， turbine efficiency， pressure ratio， compressor efficiency and total pressure recovery coefficient， and decreases as the increase of total compressor inlet temperature. Among the parameters including the total inlet temperature， pressure ratio and compressor efficiency of compressor， the total inlet temperature and efficiency of turbine， the total pressure recovery coefficient， and so on， the turbine efficiency is the most sensitive parameter for system specific power， and the pressure ratio is the most sensitive parameter for system efficiency. Considering the actual optimization potential， the total turbine inlet temperature is the most sensitive and available parameter for system specific power when the cycle fluid is determined， and the pressure ratio is the most sensitive and available parameter for system efficiency.