PEvGT循环参数优化及热力性能分析  

Parameter Optimization and Thermodynamic Performance Analysis of a Part Flow Evaporative Gas Turbine (PEvGT) Cycle

作　　者：王静[1] 张士杰[1] 肖云汉[1] 

机构地区：[1]中国科学院工程热物理研究所先进能源动力重点实验室,北京100190

出　　处：《热能动力工程》2010年第2期155-160,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(50606036);国家973计划基金资助项目(2007CB210102)

摘　　要：PEvGT循环是湿空气透平(HAT)循环和注蒸汽燃气轮机(STIG)循环的结合,既具有较高的发电效率,又可对外提供蒸汽并实现灵活的热电比调节,具有在热电联供领域应用的潜力。对配置不同的两种PEvGT循环进行了参数优化,分析了其热力性能和热电联供特性。研究表明:纯发电时,两种PEvGT循环的效率最高点对应的分流比在0～20%之间。未加湿空气、加湿空气及蒸汽在回热器前混合(PEvGT-2),循环最佳压比与HAT循环最佳压比为10左右;最高效率为51.4%比HAT循环及STIG循环分别高出0.8和3个百分点。未加湿空气和蒸汽在回热器后与湿空气混合(PEvGT-1),循环最佳压比较高且最高效率与STIG循环相当。热电联供时,两种PEvGT循环具有与STIG循环相似的热电负荷灵活性,且在蒸汽输出比例相同时,PEvGT-1与PEvGT-2循环的发电效率分别比STIG循环高0.7～1.5和3.4～12个百分点。Part flow evaporative gas turbine (PEvGT) cycle is the combination of a humid air turbine (HAT) cycle and a steam-injected gas-turbine (STIG) one. It not only enjoys a relatively high power generation efficiency, but also can provide steam to outside users. In the meantime, it can accomplish a flexible regulation of the heating/power ratio and possess latent potentialities for application in the domain needing a supply of both heat and power. In addition to conducting a parameter optimization of two types of PEvGT cycle in different configurations, the authors have also analyzed their thermodynamic performance and combined heat-and-power supply cogeneration characteristics. It has been found that during a pure power generation operation, the humidified air ratios corresponding to the maximal efficiency points of the two types of cycle are between 0% and 20%. When the non-humidified air is mixed with the humidified air and steam before the recuperator (PEvGT-2 cycle), the optimum pressure ratio of both PEvGT-2 cycle and HAT one is around 10. The maximal efficiency of the PEvGT-2 cycle (51.4%) is 0.8 and 3 percentage points higher than that of the HAT cycle and the STIG one respectively. Following a mixing of the humidified air with the steam before the recuperator, when the mixture of the humidified air and steam is blended with the non-humidified air after the recuperator (PEvGT-1 cycle), the optimum pressure ratio of the PEvGT-1 cycle is comparatively high and its maximal efficiency corresponds with that of the STIG cycle. During a heat-and-power cogeneration operation, two types of PEvGT cycle enjoy a heat and power load flexibility similar to that of the STIG cycle and when the steam output proportions of both PEvGT-1 and PEvGT-2 cycle are kept identical, their power generation efficiencies will be 0.7%~1.5% and 3.4~12 percentage points respectively higher than that of the STIG cycle.

关 键 词：PEvGT循环 HAT循环 STIG循环 热电联供 

分 类 号：TM611[电气工程—电力系统及自动化]