PG6581B型燃气轮机冷却空气信息推测

作为建立燃用低燃值合成气燃气轮机变工况模型的一个关键步骤,本文对PG6581B燃气轮机冷却空气参数及其分配进行了研究,从公开发表的净功率、效率、排气温度等数据中推测出冷却空气量的分配规律,并利用文献中GE公司F级压气机特性曲线计算简单循环变工况性能,结果与实测数据基本吻合。     

西门子H级重型燃气轮机冷却空气推测及建模

以西门子SGT5-8000H燃气轮机为研究对象,基于半经验公式和经验公式推测透平冷却空气量并建立 燃气轮机逐级计算模型,利用运行数据和参考文献对模型进行验证。应用模型分析得:总冷却空气量和第一级 静叶冷却空气量随负荷增加或环境温度升高而升高,总冷却空气占比稳定在20%左右,其中第一级静叶冷却空 气占比54%以上;燃气轮机在高负荷下效率增至38.6% ;在高负荷或低环境温度下,燃烧室部件可能过热。     

大型燃气轮机透平冷却空气量估算

大型燃气轮机透平冷却空气量一般难以直接获得。本文从燃机总体物质与能量平衡的角度,结合透平一级静叶的冷却模型,给出了一种估算大型燃气轮机冷却空气量的方法,并对GE公司系列燃气轮机和西门子公司V94．3燃气轮机冷却空气量进行了估算。结果表明采用本文的方法估算的燃气轮机透平冷却空气量是合理的。     

冷却空气对燃气轮机性能影响的计算分析

冷却空气量是影响燃气轮机性能的关键因素,透平冷却技术研究的重点方向是以最少的冷却空气量来达到最好的冷却效果,才能使燃气轮机性能达到先进水平.对市场上具有代表性的某些型号的燃气轮机冷却空气量进行了推算,并对300 MW等级燃气轮机在不同透平初温、不同冷却空气量下的性能进行了计算,对透平初温、冷却空气量对机组循环性能的影响进行了定性分析.     

考虑冷却空气影响的大型燃气轮机性能计算模型

要建立现代大型燃气轮机性能模型,必须计及冷却空气.在长期收集和总结大量工业经验和数据的基础上,建立了能够描述冷却空气影响的燃气轮机性能计算模型,有特色的内容包括：冷却空气参数和流量的计算方法;在变IGV角度条件下压气机特性线的处理;分别描述燃烧器及燃烧室的压降;计及冷却空气影响的透平功率计算方法等.所建模型的数据与再热和非再热各一台大型燃气轮机工业数据进行了对比,证明了模型的正确性和实用性.图2表3参4     

V94.3A燃气轮机压气机国产化制造

介绍了引进西门子技术的V94.3A燃机压气机的主要加工难点和工艺方案,从先进刀具、数控程序和切削试验等方面分析、总结了这些工艺方案,为燃机的后续国产化制造提供了宝贵经验.     

西门子V94.3A燃气轮机罩壳系统简介

从西门子Econopac标准化模块设计概念开始,详细地阐述了F级燃气轮机V94.3A的罩壳系统。通过对燃气轮机和汽轮机不同运行环境的比较,提出对燃气轮机罩壳系统的要求,进而对V94.3A燃气轮机罩壳系统的系统组成及其各个子系统的主要功能作出了详细的介绍。     

V94.3A型燃气轮机氮氧化物排放规律研究

以V94.3A型燃气轮机为对象,结合天然气系统工艺和燃烧室结构,对燃气轮机氮氧化物排放的变化规律进行研究。发现烟气中氮氧化物含量与燃气轮机所处的工况、天然气燃烧模式和与负荷相对应的燃气量有关。在燃气轮机单循环工作区,烟气氮氧化物的排放含量与预混天然气量、值班天然气量及其燃烧的协同作用有关,其中值班天然气流量对氮氧化物生成量影响更显著。在联合循环区,值班天然气量处于低值工作点,在运行过程中基本维持稳定,烟气排放的氮氧化物含量与预混天然气量成正相关。     

西门子V94.3A型燃气轮机运行优化浅析

本文简要介绍了国内5家采用西门子V94.3A型燃气轮机的发电厂在燃机日常运行中所遇到的一些问题,诸如:点火失败,燃烧不稳定,锅炉过热蒸汽超温限制燃气轮机OTC等;并结合国外同类机组的运行经验,分别从改进控制策略、优化系统设计、增加测量手段等方面提出了一些建议与措施。     

西门子V94.3A型燃气轮机技术升级改造介绍

本文介绍了通过增加辅助系统或者改进部件设计等途径,对西门子V94.3A型燃气轮机进行技术升级改造的几种方案,以期达到提高机组出力和效率的目的,如压气机湿压缩系统、压气机通流量升级、液力间隙优化和部分负荷运行优化等.同时还介绍了这些系统相应的原理,运行及维护.     

Effect of various inlet air cooling methods on gas turbine performance

Turbine air inlet cooling is one of many available commercial methods to improve the efficiency of an existing gas turbine. The method has various configurations which could be utilized for almost all installed gas turbines. This paper presents a comparison between two commons and one novel inlet air cooling method using turbo-expanders to improve performance of a gas turbine located at the Khangiran refinery in Iran. These methods have been applied to one of the refinery gas turbines located at the Khangiran refinery in Iran. Two common air cooling methods use evaporative media or a mechanical chiller. The idea behind the novel method is to utilize the potential cooling and power capacity of the refinery natural gas pressure drop station by replacing throttling valves with a turbo-expander. The study is part of a comprehensive program with the goal of enhancing gas turbine performance at the Khangiran gas refinery. Based on the results, it is found that using turbo-expanders is the most economically feasible option and so is recommended to be utilized for improving gas turbine performance at the Khangiran refinery.     

回热燃气轮机余热利用进气冷却的研究

本文研究了利用余热制冷进气冷却的回热燃气轮机系统,并对该系统性能进行了模拟计算,得到了压比、流量比等参数对系统性能的影响规律。并通过与常规回热循环比较,指出利用余热制冷来进气冷却的方式能使系统效率提高11%,是提高燃气轮机系统性能的有效途径之一。     

燃气轮机进气冷却技术发展现状及前景分析

分析了燃气轮机进气冷却的必要性,介绍了国内外目前应用的几种燃气轮机进气冷却技术的发展现状,分析了各自特点并对发展前景进行了展望。     

CO2应用于燃机进口空气冷却的实验研究

运用CO2作冷却介质建立高低压闭式循环系统是对燃气轮机预冷的一种尝试。针对某自备电厂联合循环机组的实际情况,设计搭建了一套实验系统。本文主要介绍了实验装置的结构尺寸、数据采集控制系统以及实验数据处理方法。通过实验,验证了该套冷却设备对于燃机进口空气的冷却效果,并达到实际燃气轮机压缩机进口空气冷却的工作要求。     

考虑实际气体性质的三轴燃气轮机中冷循环性能优化

考虑实际气体的热力性质,建立了三轴燃气轮机中冷循环的热力模型,以循环功率和效率为优化目标,对中间压比(或低压压气机压比)的分配进行了优化,同时分析了低压压气机进口气流温度、中冷度和总压比对循环性能的影响。研究发现,与不考虑实际气体热力性质的研究结论相比,循环功率或效率最大时的中间压比并不等于高压压气机压比。     

Conjugate heat transfer investigation on the cooling performance of air cooled turbine blade with thermal barrier coating

A hot wind tunnel of annular cascade test rig is established for measuring temperature distribution on a real gas turbine blade surface with infrared camera. Besides, conjugate heat transfer numerical simulation is performed to obtain cooling efficiency distribution on both blade substrate surface and coating surface for comparison. The effect of thermal barrier coating on the overall cooling performance for blades is compared under varied mass flow rate of coolant, and spatial difference is also discussed. Results indicate that the cooling efficiency in the leading edge and trailing edge areas of the blade is the lowest. The cooling performance is not only influenced by the internal cooling structures layout inside the blade but also by the flow condition of the mainstream in the external cascade path. Thermal barrier effects of the coating vary at different regions of the blade surface, where higher internal cooling performance exists, more effective the thermal barrier will be, which means the thermal protection effect of coatings is remarkable in these regions. At the designed mass flow ratio condition, the cooling efficiency on the pressure side varies by 0.13 for the coating surface and substrate surface, while this value is 0.09 on the suction side.     

Analytical method for evaluation of gas turbine inlet air cooling in combined cycle power plant

Gas turbine inlet air cooling technologies (GTIAC), mainly including chilling with LiBr/water absorption chiller and fogging as well, are being used during hot seasons to augment the power output. To evaluate the general applicability of inlet air cooling for gas–steam combined cycle power plant (GTCCIAC), parameters such as efficiency ratio, profit ratio and relative payback period were defined and analyzed through off-design performances of both gas turbine and inlet air cooling systems. An analytical method for applicability evaluation of GTCCIAC with absorption chiller (inlet chilling) and saturated evaporative cooler (inlet fogging) was presented. The applicability study based on typical off-design performances of the components in GTCCIAC shows that, the applicability of GTCCIAC with chilling and fogging depends on the design economic efficiency of GTCC power plant. In addition, it relies heavily on the climatic data and the design capacity of inlet air cooling systems. Generally, GTCCIAC is preferable in the zones with high ambient air temperature and low humidity. Furthermore, it is more appropriate for those GTCC units with lower design economic efficiency. Comparison of the applicability between chilling and fogging shows that, inlet fogging is superior in power efficiency at t_a = 15–20 °C though it gains smaller profit margin than inlet chilling. GTCC inlet chilling with absorption chiller is preferable in the zones with t_a > 25 °C and RH > 0.4.     

燃气轮机内环水余热回收研究

通过对燃机内环水所携带热量的研究,设计换热器,论证了用内环水加热燃机天然气进气的可行性,从而达到回收内环水余热,节约能源的目的。