超超临界直流锅炉蓄热能力定量分析
首发时间:2011-08-25
摘要:锅炉蓄热系数描述锅炉蓄热能力的大小,定义为单位压力变化时锅炉存储或释放的热量中可转化为电能的部分。研究一种不需要进行汽轮机高调门扰动实验的锅炉蓄热系数的计算方法,根据汽水热力性质分别计算锅炉汽水系统各部分中水、蒸汽和金属的容积蓄热系数,再结合锅炉结构设计数据计算各个设备的蓄热系数,求和后得到锅炉总蓄热系数。通过一1000MW机组计算实例表明:在不同负荷-压力工作点下,随压力的升高金属蓄热系数减小,汽水蓄热系数变化很小,总的锅炉蓄热系数降低。计算得到的锅炉蓄热系数与其不同负荷下的变化趋势可以作为超超临界直流锅炉控制的参考依据。
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The Quantitative Analysis of Ultra Supercritical Once-through Boiler Heat Storage Coefficient
Abstract:Boiler heat storage coefficient describes the capacity of boiler heat storage. It is defined as the effective heat which is stored or released when unit pressure varies. The effective heat is a part of boiler heat which can translate into electricity. A calculation method of boiler heat storage coefficient was studied which did not require disturbance experiments of turbine high-pressure regulation valve. First, the capacity heat storages of water, steam and metal in boiler water and steam system were calculated using thermodynamic properties of water and steam. Then, heat storage coefficient of each part of the system was given based on units design data. Boiler heat storage coefficient was obtained by gathering the sectional heat storages. A calculation example of a 1000MW unit power plant on different load-pressure operating points showed that, as pressure increases metal heat storage coefficient dropped, water and steam medium heat storage coefficient changed little, boiler heat storage coefficient decreased. Boiler heat storage coefficient and its tendency on different operating points could provide reference for unit power plant control.
Keywords: automatic control technique once-through boiler heat storage coefficient mechanism analysis
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