共查询到18条相似文献,搜索用时 156 毫秒
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《节能技术》2015,(1)
目前,为了平抑电网中的规模化新能源电源的随机波动,越来越多的大功率火电机组势必要进行深度变负荷运行,滑压运行是降低机组深度调峰发电煤耗的重要手段之一。本文针对热电联产机组的纯凝工况的滑压运行曲线在采暖期不能正常投运问题进行研究,提出了一种以供热抽汽量作为修正参数的热电联产机组抽汽供热期汽轮机滑压运行优化方法,给出了最优主蒸汽压力的获取方法和机组DCS改造的实现策略。此方法不仅能够满足滑压运行时的供热抽汽量需求,而且利用二维函数查询方法近似实现了三维滑压运行曲线。此外,此滑压运行优化方法还具备很好的可扩展性,可以根据实际供热工况对植入的滑压曲线进行调整,因此,具备很好的工程应用及推广价值。最后,通过实际300 MW机组的实际优化改造试验,验证了该滑压运行优化方式的有效性。这对提高热电联产机组在深度变负荷运行时的经济性具有非常重要的意义。 相似文献
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介绍了某电厂630MW亚临界汽轮机组基于阀点滑压运行优化的试验情况,提出“宽度滑压优化”的概念,即在5个常规负荷点(535MW、473MW、410MW、347MW和300MW)基础上,增加目前省电网调度对600MW容量等级机组要求的深度调峰下限负荷点(240MW)。通过不同负荷不同运行方式下的滑压比对试验,发现高压缸效率、高排汽温等指标参数的变化规律,确定调峰范围内最优的机组运行方式,同时也获得优化后的滑压运行曲线,并给出了滑压曲线背压项修正公式。与原滑压曲线相比,优化后滑压曲线尤其在深度调峰下限负荷中的应用有效地降低了机组发电热耗率和供电煤耗率,提高了机组运行的经济性和调峰性能。 相似文献
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背压变化直接影响汽轮机运行效率,因此空冷机组背压是滑压运行优化中需要考虑的重要因素。本文为获取考虑背压变化的机组最优滑压运行曲线,利用聚类算法对多个背压工况下的机组的历史数据进行深度挖掘与分析,主要包括不同背压条件下6个月近100个测点(负荷、主汽压力、主蒸汽温度等)的数据,以给出机组最优滑压运行曲线及背压变化对其影响规律。在实际超临界600 MW机组应用效果显示:该方法可在不进行大量专有试验的前提下,准确获取考虑背压变化的机组最优滑压运行曲线,有效提升了机组在变负荷过程中的经济性,也为同类型机组的运行优化提供参考。 相似文献
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FENG Weizhong 《Frontiers in Energy》2008,2(2):187
The 2 × 1000 MW ultra-supercritical steam turbine of Shanghai Waigaoqiao Phase III project, which uses grid frequency regulation and overload control through an overload valve, is manufactured by Shanghai Turbine Company using Siemens technology. Through optimization, the steam pressure is regarded as the criterion between constant pressure and sliding pressure operation. At high circulating water temperature, the turbine overload valve is kept closed when the unit load is lower than 1000 MW while at other circulating water temperatures the turbine can run in sliding pressure operation when the unit load is higher than 1000 MW and the pressure is lower than 27 MPa This increases the unit operation efficiency. The 3D bending technology in the critical piping helps to reduce the project investment and minimize the reheat system pressure drop which improves the unit operation efficiency and safety. By choosing lower circulating water design temperature and by setting the individual Boiler Feedwater Turbine condenser to reduce the exhaust steam flow and the heat load to the main condenser, the unit average back pressure and the terminal temperature difference are minimized. Therefore, the unit heat efficiency is increased. 相似文献
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Weizhong Feng 《Frontiers of Energy and Power Engineering in China》2008,2(2):187-193
The 2×1000 MW ultra-supercritical steam turbine of Shanghai Waigaoqiao Phase III project, which uses grid frequency regulation
and overload control through an overload valve, is manufactured by Shanghai Turbine Company using Siemens technology. Through
optimization, the steam pressure is regarded as the criterion between constant pressure and sliding pressure operation. At
high circulating water temperature, the turbine overload valve is kept closed when the unit load is lower than 1000 MW while
at other circulating water temperatures the turbine can run in sliding pressure operation when the unit load is higher than
1000 MW and the pressure is lower than 27 MPa This increases the unit operation efficiency. The 3D bending technology in the
critical piping helps to reduce the project investment and minimize the reheat system pressure drop which improves the unit
operation efficiency and safety. By choosing lower circulating water design temperature and by setting the individual Boiler
Feedwater Turbine condenser to reduce the exhaust steam flow and the heat load to the main condenser, the unit average back
pressure and the terminal temperature difference are minimized. Therefore, the unit heat efficiency is increased.
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Translated from Journal of Power Engineering, 2007, 27(3): 305–309, 331 [译自 : 动力工程] 相似文献
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超临界600MW汽轮机运行方式的优化研究 总被引:1,自引:0,他引:1
阐述了汽轮机变负荷运行的优化原理,介绍了某电厂600MW超临界汽轮机组变负荷运行优化试验的情况,并按照机组高调阀的实际流量特性,通过不同典型负荷下(包括540MW、480MW、420MW、360MW、330MW和300MW共6个负荷)的热效率对比试验,得到了机组优化后的变负荷运行方式,考虑了机组排汽压力的修正,给出了相应运行曲线的拟合函数.结果表明:优化后的运行方式在机组低负荷运行时,汽轮机热耗率明显降低,优化后的运行方式有效地提高了机组变负荷运行时的经济性. 相似文献
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汽轮机调峰运行采用滑压运行方式是较经济的方式,而蒸汽初压的优化确定很有意义。利用汽轮机变工况计算结果,给水泵特性,循环水泵特性等曲线的拟合,以实际供电功率与计划调度负荷之差最小作为确定蒸汽初压的目标函数,建立调峰运行滑压运行最优初压数学模型。以某电厂300MW机组为例进行计算,得滑压运行最优初压曲线,有助于指导运行人员的经济运行,可作为电厂能耗分析的基准值。本文以简单理论为基础分析问题,综合多方已知条件进行电厂运行参数优化这种方法值得研究人员探索。 相似文献