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某核电厂机组热试期间,在机组启动及甩负荷试验时,汽轮机轴封供汽调节阀频繁动作,导致轴封蒸汽无法顺利投运。通过分析轴封系统逻辑控制要求,分析轴封供汽调节阀频繁动作的根本原因,并改进该电厂轴封系统控制参数,同时提出了汽轮机轴封蒸汽冷备用问题的解决方案,为后续同类机型轴封系统的顺利投用奠定基础。 相似文献
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某厂2台机组一直存在启动过程中低压缸轴封温度偏低的问题。经过分析,供汽温度下降、管道疏水不畅是两大主要原因。采取减少进入凝汽器的低旁冷却蒸汽和提高低压轴封的供汽压力有力措施,解决了机组启动过程中的安全隐患,相当于缩短了机组的启动时间,取得很好的效果,为同类型机组的问题解决提供参考方向。 相似文献
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新建火电厂启动锅炉的无火热备用胜利发电厂尹笑天1问题的提出新建火电厂由于不具备扩建电厂原有可靠的外部蒸汽汽源的条件,在工程立项中,必须配套设计、安装相应容量和数量的启动炉,作为机组试运行期间乃至投产后机组启动时所必须的辅助用汽汽源(不直接发电)。当机... 相似文献
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The operation condition of the cold-end system of a steam turbine has a direct impact on the economy and security of the unit as it is an indispensible auxiliary system of the thermal power unit. Many factors influence the cold-end operation of a steam turbine; therefore, the operation mode needs to be optimized. The optimization analysis of a 1000 MW ultra-supercritical (USC) unit, the turbine cold-end system, was performed utilizing the back propagation (BP) neural network method with genetic algorithm (GA) optimization analysis. The optimized condenser pressure under different conditions was obtained, and it turned out that the optimized parameters were of significance to the performance and economic operation of the system. 相似文献
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论述了应加强对电厂汽轮机运行的各项指标参数进行有效的控制、管理,通过对主、辅助设备采取有效措施的分析,确保汽轮机各主、辅助设备在最佳的经济运行状态,从而达到提高汽轮机运行的安全性、经济性,以达到节能降耗的目的. 相似文献
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压水堆核电厂二回路系统管道热效率的影响因素分析 总被引:1,自引:0,他引:1
在压水堆核电厂热经济性分析中,管道热效率的分析往往不被研究者所重视。首先从管道热效率的定义出发,给出了管道热效率的计算表达式,以及各种管道损失的计算方法。然后针对某些影响管道热效率的因素,同时也对蒸汽动力转换系统循环热效率产生影响的问题,分析了影响管道热效率的因素变化对蒸汽动力转换系统循环热效率和压水堆核电厂全厂热效率的影响。最后,以某990MW核电机组为例,通过计算分析了如主蒸汽管道疏水门泄漏蒸汽、厂用蒸汽、主蒸汽管道散热、蒸汽发生器排污等对管道热效率、蒸汽动力转换系统循环热效率及全厂热效率的影响。结果表明,上述因素变化均导致管道热效率降低和全厂热效率的降低,但不同因素变化对全厂热效率的影响机理却存在较大的差别。 相似文献
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S. Bensaid S. Specchia F. Federici G. Saracco V. Specchia 《International Journal of Hydrogen Energy》2009
In the present work the implementation of MCFCs as auxiliary power units on-board large vessels, such as cruising, passengers or commercial, ships was investigated. The MCFC stack was designed to supply 500 kWe and was fed with diesel oil undergoing a reforming process. The system modelling of the plant was performed in steady-state and aimed at assessing the power efficiency for different reforming strategies, process configurations and constituting items thermal integrations. The code Matlab/Simulink was used to this end. Two major fuel processing strategies were examined: “auto-thermal reforming” and “inside vessel steam reforming”. The latter consisted of a pre-reforming unit in which the liquid fuel underwent a catalytic cracking in mild conditions; subsequently, the resulting gas mixture made of light hydrocarbons was mixed with steam and fed into a steam reformer inside the MCFC stack vessel, where conversion to syngas occurred. Due to the high temperature (650 °C) exothermic level of MCFC, the stack was compatible with a syngas steam reforming production thermally self sustained. This allowed to increase the global electrical efficiency from 32.7% (for the ATR-based system) up to 44.6%. The process was then designed aiming at increasing the overall efficiency by thermally integrating the outlet flue gases with the pre-heating section. This lead to efficiencies equal to 39.1% and 50.6% for the “auto-thermal reforming” and “inside vessel steam reforming”, respectively. Finally, the process was upgraded from an auxiliary power unit (APU) to a combined heat and power unit (CHP), since the residual heat in the flue gases was recovered for heating purposes (sanitary water production) and the demineralised water recirculation was implemented to reduce the water make-up and the process environmental footprint. 相似文献
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电力是维持人们生产生活的重要资源,火力发电厂的主要任务是发电,它的汽机辅机的运行会直接地关系到电能的使用,因此必须对火力发电厂汽机辅机的运行进行优化。 相似文献
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