蒸—燃联合循环底循环变工况计算及优化研究
发布时间：2018-09-01 12:28
【摘要】：我国执行改革开放政策以来,优先发展能源产业成为一项长期的战略任务。由于燃气轮机的单机功率和热效率都有明显的提升,特别是燃气—蒸汽联合循环技术逐渐趋于成熟,燃气轮机及其联合循环机组在世界电力系统中的地位发生了显著变化。联合循环机组有利于节省日趋紧张的能源储备,符合可持续发展的战略。增加燃气—蒸汽联合循环的研究投入,实现系统的高效运行显得尤为重要。本文针对国产某型燃气轮机展开研究,基于该燃气轮机排气参数为其匹配了合理的蒸汽底循环系统流程结构,主要工作着眼于蒸汽底循环系统变工况性能参数的精确求解以及基于热力学定律的底循环系统优化分析。首先介绍了国内外对于联合循环系统变工况研究以及参数优化的研究现状,分析了燃气—蒸汽联合循环蒸汽底循环系统变工况性能计算及优化设计的意义。借助Fortran语言实现对底循环系统变工况求解,并进行了五种(单压、双压、双压再热、三压、三压再热)不同底循环系统的变工况性能计算,通过与美国GE公司的GateCycle软件比较,验证了计算的准确性和应用价值。在此基础上,以双压无再热系统为例从热力学第一定律出发,分析蒸汽参数对底循环系统性能的影响,充分考虑底循环系统在运行中应注意的限制条件,以底循环效率最大为目标函数进行多参数的综合优化,优化后蒸汽底循环热效率相比于之前提升1.36%。同时,从不同角度出发给出描述余热锅炉炯效率的不同目标函数,并分析不同目标函数下得到不同优化结果的原因。选择合适的目标函数来描述系统性能,通过该型燃气轮机与其他两种不同型号燃机的比较,分析不同燃气轮机排气参数对底循环性能优化结果的影响,为燃机的改进和设计提供参考。
[Abstract]:Since the implementation of the reform and opening policy, it has become a long-term strategic task to give priority to the development of energy industry. Because the single engine power and thermal efficiency of gas turbine have been improved obviously, especially the gas-steam combined cycle technology has gradually matured, the status of gas turbine and its combined cycle unit has changed significantly in the world power system. Combined cycle units are conducive to saving energy reserves, which are in line with the strategy of sustainable development. It is very important to increase the research investment of gas-steam combined cycle and realize the efficient operation of the system. In this paper, a domestic gas turbine is studied. Based on the exhaust parameters of the turbine, a reasonable flow structure of the steam bottom circulating system is matched. The main work is focused on the accurate solution of the performance parameters of the steam bottom cycle system and the optimization analysis of the bottom cycle system based on the thermodynamic law. This paper first introduces the research status of off-condition research and parameter optimization of combined cycle system at home and abroad, and analyzes the significance of off-condition performance calculation and optimization design of gas-steam combined cycle steam bottom cycle system. With the help of Fortran language, the off-condition solution of bottom cycle system is realized, and the performance calculation of five different bottom cycle systems (single pressure, double pressure reheat, three pressure reheat) is carried out. The results are compared with the GateCycle software of GE Company of the United States. The accuracy and application value of the calculation are verified. On this basis, taking the double pressure non-reheat system as an example, the influence of steam parameters on the performance of bottom circulation system is analyzed according to the first law of thermodynamics, and the limiting conditions that should be paid attention to in the operation of bottom circulation system are fully considered. Taking the maximum bottom cycle efficiency as the objective function, the multi-parameter comprehensive optimization is carried out. The heat efficiency of steam bottom cycle after optimization is 1.36% higher than that before. At the same time, different objective functions are given to describe the efficiency of waste heat boiler from different angles, and the reasons for obtaining different optimization results under different objective functions are analyzed. A suitable objective function is chosen to describe the performance of the system. By comparing this type of gas turbine with other two different types of gas turbine, the influence of exhaust parameters of different gas turbine on the optimization results of bottom cycle performance is analyzed. To provide reference for the improvement and design of gas turbine.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK471
本文编号：2217203
[Abstract]:Since the implementation of the reform and opening policy, it has become a long-term strategic task to give priority to the development of energy industry. Because the single engine power and thermal efficiency of gas turbine have been improved obviously, especially the gas-steam combined cycle technology has gradually matured, the status of gas turbine and its combined cycle unit has changed significantly in the world power system. Combined cycle units are conducive to saving energy reserves, which are in line with the strategy of sustainable development. It is very important to increase the research investment of gas-steam combined cycle and realize the efficient operation of the system. In this paper, a domestic gas turbine is studied. Based on the exhaust parameters of the turbine, a reasonable flow structure of the steam bottom circulating system is matched. The main work is focused on the accurate solution of the performance parameters of the steam bottom cycle system and the optimization analysis of the bottom cycle system based on the thermodynamic law. This paper first introduces the research status of off-condition research and parameter optimization of combined cycle system at home and abroad, and analyzes the significance of off-condition performance calculation and optimization design of gas-steam combined cycle steam bottom cycle system. With the help of Fortran language, the off-condition solution of bottom cycle system is realized, and the performance calculation of five different bottom cycle systems (single pressure, double pressure reheat, three pressure reheat) is carried out. The results are compared with the GateCycle software of GE Company of the United States. The accuracy and application value of the calculation are verified. On this basis, taking the double pressure non-reheat system as an example, the influence of steam parameters on the performance of bottom circulation system is analyzed according to the first law of thermodynamics, and the limiting conditions that should be paid attention to in the operation of bottom circulation system are fully considered. Taking the maximum bottom cycle efficiency as the objective function, the multi-parameter comprehensive optimization is carried out. The heat efficiency of steam bottom cycle after optimization is 1.36% higher than that before. At the same time, different objective functions are given to describe the efficiency of waste heat boiler from different angles, and the reasons for obtaining different optimization results under different objective functions are analyzed. A suitable objective function is chosen to describe the performance of the system. By comparing this type of gas turbine with other two different types of gas turbine, the influence of exhaust parameters of different gas turbine on the optimization results of bottom cycle performance is analyzed. To provide reference for the improvement and design of gas turbine.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK471
【参考文献】
相关期刊论文 前2条
1 江丽霞,张娜,蔡睿贤;单压过热蒸汽余热锅炉变工况解析解[J];工程热物理学报;1999年04期
2 张士杰;肖云汉;;基于微燃机的HAT循环变工况性能分析[J];工程热物理学报;2006年04期
，本文编号：2217203
本文链接：https://www.wllwen.com/kejilunwen/dongligc/2217203.html
