稳降压联合吹管方式在640MW超临界锅炉上的应用

本文介绍了江西贵溪电厂工程三期#2国产640MW超临界直流锅炉,调试吹管采用稳降压联合吹管方式及吹管方法,分析了吹管中出现的等离子断弧、超温和磨煤机启动时注意的问题等,提出了吹管的控制要点.实际吹管效果良好,超临界直流炉采用稳压和降压联合吹管取得成功.     

660MW超临界机组稳压吹管分析

对某660 MW超临界机组的稳压吹管技术稳压吹管的准备工作和吹管过程控制进行了全面介绍,详细分析了稳压吹管参数,最后针对本次稳压吹管过程中出现的问题提出解决方案,仅以此为超临界机组稳压吹管工作提供参考.     

超超临界1GW机组塔式锅炉稳压吹管方案的探索

根据螺旋管圈塔式锅炉特点,将稳压吹管作为该锅炉的吹管方式,并选择了适当的吹管参数;根据的现场情况设计了吹管临时系统,且增加了临时补水系统;将超超临界1 GW机组塔式锅炉蒸汽稳压吹管过程设计为:冷态冲洗、热态冲洗、试吹管、正式吹管等过程.     

联合循环蒸汽管道的吹扫

本文介绍联合循环电厂中汽轮机进汽管道的吹管方法和吹管过程中汽、水工质的流动变化．     

稳压法蒸汽吹管在600MW超临界直流锅炉上的应用

通过对锅炉稳压吹管和降压吹管特点的比较,确定蒸汽吹管方式、参数,实践证明吹管效果良好,达到了预期的效果,为在建600MW超临界机组的调试提供很好的经验借鉴.     

二次再热机组二段吹管方法的选择

二次再热锅炉因增加一级再热器,点火吹管时系统更加复杂,过热器系统蓄热量明显不足,导致目前国内大部分二次再热锅炉吹管时都选择分阶段降压吹管,少部分锅炉选择稳压吹管.目前国内大部分超超临界机组都采用降压吹管法,此方法更加适合国内机组的基建情况.本文以某超超临界二次再热机组为例,分析二段降压吹管法中的最优法.最后表明利用一次...     

燃气-蒸汽联合循环机组余热锅炉吹管实例

目前,国内很多电厂采用9FB级"二拖一"燃气蒸汽联合循环布置方式,余热锅炉(HRSG)全部为三压系统,汽水系统流程较为复杂,其蒸汽吹管过程也较传统的燃煤机组或其他双压无再热小型机组有很大的不同。以某电厂蒸汽吹管实际为例,介绍了9FB级"二拖一"燃气蒸汽联合循环机组蒸汽吹管的工艺流程、蒸汽参数以及吹管系数的选取。阐述了吹管的全部过程,并分析在吹管过程中遇到的问题和处理建议。本实例所采用的吹管方法,不仅达到了良好的吹扫效果而且简化了集粒器及其临时系统加工、施工和恢复的步序,缩短了吹管工期,可为同类型机组吹管调试提供经验。     

400MW级分轴燃气-蒸汽联合循环机组余热锅炉蒸汽吹管的应用

针对目前国内典型400 MW级"一拖一"分轴燃气-蒸汽联合循环机组的技术特点,采用对应燃机点火、余热锅炉自产汽源进行降压蒸汽吹管的方案,对三压、再热余热锅炉各受热面分别采用相应的蒸汽参数并分阶段进行吹扫。临时系统配置了三个临冲门及一个消音器,在简化吹管系统的基础上增强了吹管操作的灵活性,为同类型余热锅炉蒸汽吹管提供了参考。     

降压吹管技术在1000MW超超临界锅炉的应用

本文通过广东省1000MW超超临界直流锅炉的蒸汽吹管实施情况介绍，详细介绍了降压吹管在超超临界直流锅炉的应用、吹管系统特点、吹管实施控制过程、参数变化情况、吹管发现问题等。     

300MW燃气—蒸汽循环发电机组170t／h余热锅炉吹管方法的优化

本文通过对常规锅炉各种吹管方法的分析比较，结合联合循环余热锅炉的特点，提出该类余热锅炉吹管的最佳方案，并在实践中得到验证。     

Comparative studies of augmentation in combined cycle power plants

The attractive features of a combined cycle (CC) power plant are fuel flexibility, operational flexibility, higher efficiency and low emissions. The performance of five gas turbine‐steam turbine (GT‐ST) combined cycle power plants (four natural gas based plants and one biomass based plant) have been studied and the degree of augmentation has been compared. They are (i) combined cycle with natural gas (CC‐NG), (ii) combined cycle with water injection (CC‐WI), (iii) combined cycle with steam injection (CC‐SI), (iv) combined cycle with supplementary firing (CC‐SF) and (v) combined cycle with biomass gasification (CC‐BM). The plant performance and CO₂ emissions are compared with a change in compressor pressure ratio and gas turbine inlet temperature (GTIT). The optimum pressure ratio for compressor is selected from maximum efficiency condition. The specific power, thermal efficiency and CO₂ emissions of augmented power plants are compared with the CC‐NG power plant at the individual optimized pressure ratios in place of a common pressure ratio. The results show that the optimum pressure ratio is increased with water injection, steam injection, supplementary firing and biomass gasification. The specific power is increased in all the plants with a loss in thermal efficiency and rise in CO₂ emissions compared to CC‐NG plant. Copyright © 2013 John Wiley & Sons, Ltd.     

饱和蒸汽减温在燃机余热锅炉的应用

介绍了燃气－蒸汽联合循环电站余热锅炉过热蒸汽调温的一种方法－自身饱和蒸汽减温。对余热锅炉自身饱和蒸汽减温系统的设计进行了分析,指出了实际应用中应该注意的问题。     

联合循环机组蒸汽系统的设计优化

联合循环机组蒸汽系统的设计需根据电厂的海拔、气温、燃料等条件选择和优化。本文研究了联合循环蒸汽系统流程的选择和参数优化的方法．给出了五种典型燃气轮机联合循环机组蒸汽系统的算例和分析．指出了蒸汽系统流程配置和参数对联合循环机组效率和出力的定量影响。     

连续蒸汽吹扫技术在乌奇工程上应用浅析

针对巴基斯坦乌奇560MW联合循环电站工程蒸汽吹扫方案的成功案例,分析了连续中压蒸汽吹扫技术的特点,为蒸汽吹扫参数的选择提供了参考依据。     

不同的燃气轮机调控方案对燃气—蒸汽联合循环电站性能的影响

以某燃气－蒸汽联合循环电站的主要配置 基础,计算并分析比较了在改变燃料 量和调节压气机可转导叶等不同调控方案对燃气－蒸联合循环各3个组成部分及总体性能的影响,从而为燃气－蒸汽联合循环电站合理选择燃气轮机调控方案提供有意义的参考。     

Comparative analysis of power augmentation in air bottoming cycles

The air bottoming cycle (ABC) is a proposed plant configuration in which the steam turbine bottoming cycle in conventional combined power plants is replaced by another gas turbine cycle. Nevertheless, ABC's relatively low efficiency reduces the likelihood of having an ABC power plant in the near future. In this research work, steam injection in the topping cycle combustion chamber and supplementary firing are recommended to improve ABC's performance. Three different configurations of ABC, including simple ABC, ABC with steam injection, and ABC with supplementary firing, are investigated. A thermo-economic analysis is performed to study the effects of the proposed power augmentation approaches thermodynamically and economically. Moreover, optimisation is carried out with the objective of minimising the total cost of the plant for different configurations. Furthermore, a multi-objective optimisation is performed and the results are presented to further understand the trade-off between higher efficiency and lower operating cost.     

A novel power block for CSP systems

Concentrating Solar Thermal Power (CSP) and in particular parabolic trough, is a proven large-scale solar power technology. However, CSP cost is not yet competitive with conventional alternatives unless subsidized. Current CSP plants typically include a condensing steam cycle power block which was preferably designed for a continuous operation and higher operating conditions and therefore, limits the overall plant cost effectiveness and deployment. The drawbacks of this power block are as follows: (i) no power generation during low insolation periods (ii) expensive, large condenser (typically water cooled) due to the poor extracted steam properties (high specific volume, sub-atmospheric pressure) and (iii) high installation and operation costs.In the current study, a different power block scheme is proposed to eliminate these obstacles. This power block includes a top Rankine cycle with a back pressure steam turbine and a bottoming Kalina cycle comprising another back pressure turbine and using ammonia-water mixture as a working fluid. The bottoming (moderate temperature) cycle allows power production during low insolation periods. Because of the superior ammonia-water vapor properties, the condensing system requirements are much less demanding and the operation costs are lowered. Accordingly, air cooled condensers can be used with lower economical penalty. Another advantage is that back pressure steam turbines have a less complex design than condensing steam turbines which make their costs lower. All of these improvements could make the combined cycle unit more cost effective. This unit can be applicable in both parabolic trough and central receiver (solar tower) plants.The potential advantage of the new power block is illustrated by a detailed techno-economical analysis of two 50 MW parabolic trough power plants, comparing between the standard and the novel power block. The results indicate that the proposed plant suggests a 4-11% electricity cost saving.     

配PG9171E燃机余热锅炉主蒸汽参数的优化计算

联合循环系统中余热锅炉主蒸汽参数的确定 ,直接影响到蒸汽循环系统的性能和整个联合循环装置的效率。以某电厂烧重油PG91 71E燃机联合循环蒸汽循环系统为对象 ,建立了余热锅炉主蒸汽参数优化的热工模型。同时结合余热锅炉的设计 ,分别对主蒸汽压力、温度进行了优化计算。计算结果与国外公司的推荐数据完全一致 ,表明建立的模型正确 ,选定的优化约束条件合理 ,可供联合循环工程设计参考。     

Cost numerical optimization of the triple‐pressure steam‐reheat gas‐reheat gas‐recuperated combined power cycle that uses steam for cooling the first GT

Optimization is an important method for improving the efficiency and power of the combined cycle. In this paper, the triple‐pressure steam‐reheat gas‐reheat gas‐recuperated combined cycle that uses steam for cooling the first gas turbine (the regular steam‐cooled cycle) was optimized relative to its operating parameters. The optimized cycle generates more power and consumes more fuel than the regular steam‐cooled cycle. An objective function of the net additional revenue (the saving of the optimization process) was defined in terms of the revenue of the additional generated power and the costs of replacing the heat recovery steam generator (HRSG) and the costs of the additional operation and maintenance, installation, and fuel. Constraints were set on many operating parameters such as air compression ratio, the minimum temperature difference for pinch points (δT_ppm), the dryness fraction at steam turbine outlet, and stack temperature. The net additional revenue and cycle efficiency were optimized at 11 different maximum values of turbine inlet temperature (TIT) using two different methods: the direct search and the variable metric. The optima were found at the boundaries of many constraints such as the maximum values of air compression ratio, turbine outlet temperature (TOT), and the minimum value of stack temperature. The performance of the optimized cycles was compared with that for the regular steam‐cooled cycle. The results indicate that the optimized cycles are 1.7–1.8 percentage points higher in efficiency and 4.4–7.1% higher in total specific work than the regular steam‐cooled cycle when all cycles are compared at the same values of TIT and δT_ppm. Optimizing the net additional revenue could result in an annual saving of 21 million U.S. dollars for a 439 MW power plant. Increasing the maximum TOT to 1000°C and replacing the stainless steel recuperator heat exchanger of the optimized cycle with a super‐alloys‐recuperated heat exchanger could result in an additional efficiency increase of 1.1 percentage point and a specific work increase of 4.8–7.1%. The optimized cycles were about 3.3 percentage points higher in efficiency than the most efficient commercially available H‐system combined cycle when compared at the same value of TIT. Copyright © 2008 John Wiley & Sons, Ltd.     

Cycle improvements to steam injected gas turbines

The efficiency and specific power of the steam injected gas turbine is analysed by modelling the thermodynamic cycle. In this model special attention is paid to the blade cooling. The basic cycle as well as cycles with improvements such as intercooling, heat recovery by regenerator and blade cooling using steam are studied. The different cycles are compared with the combined cycle and the intercooled regenerative cycle. The conclusion is that the steam injected cycles have high efficiency and specific power. Adding heat exchangers to the cycle is not beneficial. Using steam as coolant for the blades offers interesting perspectives. Copyright © 2000 John Wiley & Sons, Ltd.