热力发电2018，Vol.47Issue(5)：49-56,8.DOI:10.19666/j.rlfd.201801015
燃气蒸汽联合循环热电联产机组热经济性分析
Thermal-economic analysis of combined heat and power generation unit of gas-steam combined cycle
摘要
Abstract
The thermodynamic characteristics of combined heat and power generation unit of gas-steam combined cycle under different working conditions are compared to find the location and causes of the unit heat loss. It can provide theoretical guidance for the optimal operation and energy-saving transformation of the unit. In this study, thermal efficiency of unit is calculated by the direct balance method of the heat method at first. Then exergy loss is calculated by the indirect balance method, and the calculation results are checked and analyzed with the results of direct balance method. Finally, the exergy analysis method is used to calculate the energy loss and efficiency of combined heat and power generation unit of gas-steam combined cycle. By comparing the results of the heat method and the exergy analysis method, it is found that, the increase of engine load has a great influence on heat loss and efficiency of the combined cycle, which improves the unit exergy efficiency. The exergy efficiency decreases slightly with rising ambient temperature. The changes in the exergy efficiency of gas turbine determine the trend of changes in unit exergy efficiency, and the use of combined heat and power generation unit can effectively improve the operating economics of the gas-steam combined cycle unit.关键词
燃气蒸汽联合循环/热电联产/热力学特性/热量法/㶲方法/正反平衡法/热经济性Key words
gas-steam combined cycle/combined heat and power generation/thermodynamic characteristic/heat method/exergy method/direct and indirect balance method/thermal economy分类
信息技术与安全科学引用本文复制引用
何青,罗宁..燃气蒸汽联合循环热电联产机组热经济性分析[J].热力发电,2018,47(5):49-56,8.基金项目
国家自然科学基金项目(51276059) （51276059）
National Natural Science Foundation of China (51276059) （51276059）
