蒸汽焓角度确定汽轮机回热系统抽汽参数方法

Bleed parameters determination method of steam turbine regenerative system with bleed enthalpy

以传统分析回热系统抽汽参数方法为基础,提出了以汽轮机抽汽焓为变量,回热系统效率最大为目标函数确定机组最佳抽汽参数的方法,推导出相邻两级加热器抽汽焓值的递推关系,从而确定出机组再热前、后各级最佳的抽汽焓值.用以上递推关系式确定现有660 MW一次再热机组的抽汽参数,得到回热系统效率为48.19%,提高了0.29%,为如何确定回热系统抽汽参数提出了新的分析方向和指导建议.

On the basis of the conventional method of feed water enthalpy rise,the recursive relations between the adjacent bleed enthalpy was derived for the maximal regenerative efficiency with the steam turbine bleed enthalpy as varables. The optimal bleed enthalpy of the unit stages before and after reheat was determined. With the recursive equation,the rational bleed enthalpy of the 660 MW single reheat unit was determined,and the regenerative system efficiency was 48. 19%,which was 0. 29% higher than before. And put forward a new research direction and guidance advice for how to determine the regenerative bleed parameters.