共查询到20条相似文献,搜索用时 203 毫秒
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本文应用汽轮机转矩平衡和流动力学原理分析了锅炉给水泵汽轮机(BFPT)变速控制系统的特性,提出了一类BFPT的非线性数学模型及线性化的模型.采用数学仿真的方法,探讨了该系统的静态和动态特性,为这种系统进一步的研究和设计提供了有效的方法. 相似文献
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建立了W火焰锅炉炉膛动态数学模型,模型中对碳的反应速度计算式进行了修正。考虑了烟气质量和能量的动态特性及炉膛压力对反应速度的影响。仿真试验表明,模型正确反映了W火焰锅炉的燃烧特点,模型可用于W火焰锅炉的仿真工程分析。 相似文献
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超临界直流锅炉长期动态特性对超临界直流锅炉汽轮机发电机组的仿真和控制系统设计具有十分重要的意义。为了快捷、全面、可靠地研究调峰及负荷变化过程中超临界直流锅炉的长期动态特性,通过合理地机理分析和模型简化,应用状态空间方法建立了超临界直流锅炉省煤器,水冷壁,过热器及再热器的简化数学模型,推导出工质侧压力流量变化的一组更为简洁、新颖的非线性关系式。最后以上述简化状态空间模型和非线性关系式为工具对某600MW超临界直流锅炉的长期动态特性进行了仿真研究,仿真结果正确。本文的研究为超临界直流锅炉的长期动态特性研究提供了一个十分简便的数学模型和方法。 相似文献
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对间冷回热燃气轮机关键部件逆流板翅式换热器进行了动态性能的仿真研究。在考虑气体工质压缩性的基础上,根据换热器内部冷、热流体的压力、流量和温度的变化和冷热流道间隔板的热平衡,建立了逆流板翅式换热器的动态数学模型,在EASY5平台上搭建了逆流板翅式换热器的分布参数模型,并进行了动态的仿真试验计算。分析结果表明该逆流板翅式换热器模型较好地实现了对换热器内部流体流动和换热的模拟,可以作为部件模块,用来时间冷回热燃气轮机系统性能的仿真研究。 相似文献
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本文介绍了一种适合燃气轮机推进系统实时仿真的舰用燃汽轮机建模方法——瞬态扭矩系数法,并用此法建立了LM2500燃气轮机的时真模型,实例运行结果表明,这种模型简单方便,具有一定的精度。 相似文献
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《Biomass & bioenergy》2003,24(2):117-124
Palm oil mills in Malaysia operate on cogeneration system using biomass residue as fuel in the boiler. The boiler produces high pressure and temperature steam which expands in a backpressure steam turbine and produces enough electric power for the internal needs of the mill. The exhaust steam from the turbine goes to an accumulator which distributes the steam to various processes in the mill.The study were made on seven palm oil mills in the Perak state in Malaysia. The primary objectives of the study are to determine boiler and turbine efficiencies, energy utilization factor, oil extraction rate and heat/power ratio for various palm oil mills working under similar conditions and adopting same processes. The palm oil industry is one of those rare industries where very little attempt is made to save energy. The energy balance in a typical palm oil mill is far from optimum and there is considerable scope for improvement. Bench-marking is necessary for the components in the mill. Energy-use bench-marking can give an overview of energy performance of the mills. The calculations were done to get net gain in power when back pressure turbine is replaced by a condensing turbine.It was found that the boiler and turbine have low thermal efficiencies compared to conventional ones used in power plants due to non-homogeneity and non-uniform quality of the fuel. The extraction rate was around 0.188. The use of condensing turbine increase the power output by 60% and the utilization factor was found to be 65% for the cogeneration system. 相似文献
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Direct steam generation (DSG) is one alternative to the current oil-based parabolic trough solar thermal power plants. Within the German research project ITES, the dynamic behavior of a DSG collector field and the interactions with the conventional power block are assessed in detail. A transient solar field model developed by DLR is used to simulate the steam temperature behavior. Artificial irradiance disturbances as well as real irradiance data are used as input to the system. The resulting main steam temperature gradients are then analyzed by Siemens considering the standards for steam turbines.This paper presents the transient simulation results of the steam temperature as well as the corresponding results of the steam turbine analysis. It is found that the occurring temperature gradients are challenging for a safe turbine operation, if a conservative control system is used. Therefore, the use of an additional thermal inertia to stabilize the steam temperature is suggested. Its impact is also analyzed and discussed in this paper. 相似文献
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国产600MW超临界机组甩负荷试验分析 总被引:2,自引:1,他引:1
介绍了一台我国首批国产600MW超临界汽轮机组甩负荷试验的成功经验,叙述了该机组甩负荷试验的主要过程,对试验结果进行了分析计算.对超临界机组来说,虽然采用直流锅炉,甩负荷后大负荷迅速变工况下,维持相关参数比较困难.实践表明,通过制定科学的操作程序,精心操作,完全可以实现甩负荷后锅炉不灭火、汽轮机维持空转迅速并网接带负荷的要求. 相似文献
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