摘要
给出了超（超）临界直流锅炉蓄热系数的计算方法：首先根据水和水蒸气的热力性质,通过程序计算出水冷壁中各相态段的长度,然后依据体积守恒方程、质量守恒方程和能量守恒方程分别计算水冷壁和过热器的蓄热系数.以某660 MW超超临界直流锅炉为例,利用锅炉设计数据计算得到4个工况下水冷壁和过热器的蓄热系数.结果表明：锅炉的蓄热系数为60 s左右,水冷壁蓄热系数占锅炉蓄热系数的15％～30％,过热器蓄热系数占锅炉蓄热系数的70％～85％.
A calculation method has been proposed for heat storage coefficient of ultra supercritical once- through boilers. First, the length of each phase state in the water wall is calculated by program based on thermodynamic properties of the water and steam. Second, the mass, volume, and energy balance equa- tions are used to obtain the heat storage coefficient of both the water wall and superheater. Taking a 660 MW ultra supercritical power plant as an example, heat storage coefficients of the water wall and super- heater were respectively calculated at four different loads using design data of the boiler. Calculation re- suits show that the boiler＇s heat storage coefficient is about 60 s, in which the water wall accounts for 15%- 30%, and the superheater accounts for 70%-85%.
出处
《动力工程学报》
CAS
CSCD
北大核心
2015年第3期173-177,共5页
Journal of Chinese Society of Power Engineering
关键词
超(超)临界直流锅炉
水冷壁
过热器
蓄热系数
ultra supercritical once-through boiler water wall superheater heat storage coefficient
