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介绍了为满足电网对机组灵活性及降低全寿命运行成本的要求,西门子所提出的“灵活燃气轮机联合循环电厂(FlexPlant)”(下简称灵活电厂)设计理念,即一种具有频繁快速启动和调峰能力,总体运行效率更高。更灵活的联合循环电厂;并详细列举了“灵活电厂”设计中所采取的先进技术.以及在缩短启停时间,提高低负荷效率以及减少电厂的排放水平所取得的成果。“灵活电厂”具有的巨大经济效益和市场竞争力将明显超过现有的燃气轮机联合循环电厂。 相似文献
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针对三菱M701F级燃气-蒸汽联合循环机组经常参与调峰而涉及到频繁启停,且余热锅炉因惯性大而启动慢的特点,结合余热锅炉的工作原理及相关特性 ,为了缩短余热锅炉启动时间,提出了一种启动优化模型。该方法以APROS(Advanced Process Simulation Software)模型为基础,综合理论分析和经验归纳,对余热锅炉内部各模块进行了详细的仿真研究。仿真结果表明,以APROS为基础的优化模型能够在准确模拟余热锅炉稳态运行工况的同时缩短至少20%的启动时间,对联合循环机组整体的运行优化有很大的帮助。 相似文献
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介绍了浙江半山天然气发电工程采用三套350MW级燃气—蒸汽联合循环发电机组,每套机组有四大主机:燃气轮机(GT)、余热锅炉(HRSG)、汽轮机(ST)及发电机(G)。由于气价较高,确定采用F级燃机及相应的余热锅铲与汽轮机;对主机配置进行比选,确定每套机组由一台F级燃机、一台余热锅铲、一台汽轮机组成单轴系统(燃机、汽轮机与发电机同轴)。 相似文献
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为迎接西气东输和液化天然气的输人,我国东部地区正准备建设一批大型联合循环电厂。为使建成后的电厂单位投资少、热效率高、投产后具有较好的效益,选择合适的余热锅炉蒸汽系统至关重要。对我国急需建设的大型天然气联合循环电厂的余热锅炉蒸汽系统中有关余热锅炉节点温差和接近点温差的选取、蒸汽压力级数的选择、排烟温度的高低、烟气阻力的大小、蒸汽参数和再热的确定、给水的加热和除氧方式及炉型的选择进行分析和研究,得出明确的优化结论。 相似文献
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针对浙江省燃气-蒸汽联合循环发电厂燃机的余热锅炉经历了如下的进展:第一代为配36MW燃机的国产余热锅炉,第二代是配9E型燃机的进口余热锅炉,第三代是配9F型燃机的引进技术国产余热锅炉.文章对比了三代余热锅炉的性能参数,指出总的发展趋势是应用更大容量及更高效率的余热锅炉. 相似文献
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Thermo‐Economic Analysis and Multiobjective Optimization of Dual Pressure Combined Cycle Power Plant with Supplementary Firing
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The heat recovery steam generator (HRSG) and duct burner are parts of a combined cycle which have considerable effect on the steam generation. The effect of the gas turbine, duct burner and HRSG on power generation is investigated to reduce exergy destruction and power loss in the gas turbine. The results show that with an increase in duct burner flow rate, pressure loss in the recovery boiler increases, steam generation increases on the HP side while it decreases on the LP side. With a reduction in the HP pinch point, thermal recovery increases while the LP pinch point does not have a significant effect. Then, power loss due to pressure drop in the gas turbine and the electricity cost are considered as two objective functions for optimization. Finally, the sensitivity analysis on ambient temperature, compressor pressure ratio, fuel lower heating value, duct burner fuel rate, condenser pressure and main pressure are performed and results are reported. It is concluded that with an increment in compressor pressure ratio, the duct burner flow rate and consequently steam generation increases while electricity cost decrease. 相似文献
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Energy and exergy analyses were previously performed by the authors of a coal-fired steam power plant. These analyses suggest that the steam generator (and its combustion and heat-transfer processes) is the most inefficient plant device and that significant increases in overall plant efficiency are possible by reducing steam-generator irreversibilities. Here, a possible plant alteration is examined to increase the efficiency of the plant by reducing the irreversibility rate in the steam generator. The modification involves decreasing the fraction of excess combustion air from 0.40 to 0.15. The results show that overall-plant energy and exergy efficiencies both increase by 1.4% when the fraction of excess combustion air decreases from 0.4 to 0.15.Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
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Energy and exergy analysis were carried out for a combined‐cycle power plant by using the data taken from its units in operation to analyse a complex energy system more thoroughly and to identify the potential for improving efficiency of the system. In this context, energy and exergy fluxes at the inlet and the exit of the devices in one of the power plant main units as well as the energy and exergy losses were determined. The results show that combustion chambers, gas turbines and heat recovery steam generators (HRSG) are the main sources of irreversibilities representing more than 85% of the overall exergy losses. Some constructive and thermal suggestions for these devices have been made to improve the efficiency of the system. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
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This paper proposes a methodology to identify the most relevant design parameters that impact on the thermal efficiency and the economic results of combined cycle gas turbine power plants. The analysis focuses on the heat recovery steam generator (HRSG) design and more specifically on those operating parameters that have a direct influence on the economic results of the power plant. These results are obtained both at full and part load conditions using a dedicated code capable of simulating a wide number of different plant configurations. Two different thermoeconomic models aimed to select the best design point are proposed and compared: the first one analyzes the generating cost of the energy while the second one analyzes the annual cash flow of the plant. Their objective is to determine whether an increase in the investment in order to improve the thermal efficiency is worth from an economic point of view. Both models and the different HRSG configurations analysed are compared in the results section. Some parametric analysis show how the design parameters might be varied in order to improve the power plant efficiency or the economic results. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
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结合遗传算法理论,提出联合循环电站余热锅炉的参数优化设计模型,针对一定型号的燃气轮机,给出了相应的优化实例。结果表明,利用上述计算模型可以得到余热锅炉的最优设计参数,使联合循环电站的经济性达到最佳。表4参7 相似文献
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燃气-蒸汽联合循环(CCPP)余热锅炉入口过渡烟道连接着燃气轮机与锅炉本体,其结构参数影响着余热锅炉炉内气体流动及换热,进而影响循环机组的效率。以某9F级CCPP系统135 MW的余热锅炉入口烟道为研究对象,利用数值模拟方法针对上仰角及导流板对烟道内部流场的影响进行了研究,分析了气体流动平均速度及流动均匀性。结果表明:当烟道上顶面第1段上仰角α1不变、烟道上顶面第2段上仰角α2减小时,烟道底部高速区范围减小,上部回流区变大,平均速度减小,流动均匀性变差;当α1减小、α2不变时,结论刚好相反。α1=30°,α2=70°的方案为最佳方案,该结构下烟气平均速度较初始方案提高1.87%。导流板设置可以极大增加烟气的平均流速,增加流动均匀性;导流板角度为30°,25°和20°的烟道结构为最佳方案,该烟道内烟气平均速度较原方案提高48.15%。 相似文献
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In this study, a thermodynamic analysis of a Rankine cycle reheat steam power plant is conducted, in terms of the first law of thermodynamic analysis (i.e. energy analysis) and the second law analysis (i.e. exergy analysis), using a spreadsheet calculation technique. The energy and exergy efficiencies are studied as 120 cases for different system parameters such as boiler temperature, boiler pressure, mass fraction ratio and work output. The temperature and pressure values are selected in the range between 400 and 590°C, and 10 and 15 MPa, being consistent with the actual values. The calculated energy and exergy efficiencies are compared with the actual data and the literature work, and good agreement is found. The possibilities to further improve the plant efficiency and hence reduce the inefficiencies are identified and exploited. The results show how exergy analysis can help to make optimum design decisions in a logical manner. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
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推导了双压无再热联合循环余热锅炉的出力与参数的关系 ,阐述了双压无再热联合循环余热锅炉参数优化的目的、方法及步骤。 相似文献
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Ammar A. Alsairafi 《国际能源研究杂志》2013,37(3):211-227
This paper provides a theoretical study of the effects of ambient conditions on the thermodynamic performance of a hybrid combined‐nuclear cycle power plant. The operational parameters investigated are based on the first and second laws of thermodynamics, which include the ambient air temperature and ambient relative humidity (Φ). The results obtained for the gas turbine model are shown to agree very well with operational data from the Al‐Zour Emergency power plant in Kuwait. The ambient temperature was studied within the range of 0–55 °C. The analysis shows that the ambient air temperature has strong effects on plant performance and that operating the system at a high temperature will degrade the performance. Power output is reduced when the temperature is above the standard ambient temperature of 15 °C, and this loss rate is about 17% at 55 °C. The effect of ambient relative humidity (Φ) becomes significant only at higher temperatures. The ambient temperature has a large effect on the exergy destruction of the heat recovery steam generator exhaust, but it has little effect on other components of the plant. The analysis also indicates that reducing the temperature from 55 to 15 °C could help decrease the total exergy destruction of the plant by only 2%. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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This study deals with the exergetic performance assessment of a combined heat and power (CHP) system installed in Eskisehir city of Turkey. Quantitative exergy balance for each component and the whole CHP system was considered, while exergy consumptions in the system were determined. The performance characteristics of this CHP system were evaluated using exergy analysis method. The exergetic efficiency of the CHP system was accounted for 38.16% with 49 880 kW as electrical products. The exergy consumption occurred in this system amounted to 80 833.67 kW. The ways of improving the exergy efficiency of this system were also analysed. As a result of these, a simple way of increasing the exergy efficiency of the available CHP system was suggested that the valves‐I–III and the MPSC could be replaced by a 3500 kW‐intermediate pressure steam turbine (IPST). If the IPST is installed to the CHP system (called the modified CHP (MCHP) system), the exergetic efficiency of the MCHP system is calculated to be 40.75% with 53 269.53 kW as electrical products. The exergy consumption is found to be 77 444.14 kW in the MCHP system. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献