基于回热加热器变工况的机组热经济性通用数学模型  

General Mathematical Model for Heat Economy of Unit Based on Operation Condition of Regenerative Heater

作　　者：谭良红 胡三高[1] 曹晟磊[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《华北电力大学学报（自然科学版）》2016年第4期104-110,共7页Journal of North China Electric Power University：Natural Science Edition

摘　　要：针对火电厂的回热系统,考虑外部热量引入时回热加热器变工况运行的影响,以汽轮机的功率方程、热力系统的热平衡方程、锅炉循环吸热方程为基础,经过严格的数学推导,导出纯热量引入回热系统时功率变化和吸热量变化的通用计算公式。以N300-16.5/550/550机组为例,计算在各级加热器引入1 k J/kg纯热量的机组经济性变化,并与详细计算和等效焓降法计算的结果相比较,结果表明:和等效焓降法相比,在做功增量方面,除了一号加热器和除氧器,本方法计算的结果相对偏大,在吸热量方面也存在不同;而与详细计算的结果几乎一致,验证了本方法的正确性。The general calculation formula of power change and heat change are found through strict mathematical derivation to the regenerative system in plant,considering the operation of regenerative heater for external heat,based on heat balance equation,turbine power equation and boiler absorbed heat equation. When 1 k J / kg heat is introduced to every level of the heater in a N300- 16. 5 /550 /550 unit,the change of heat economy is calculated and the result is compared with that of the detailed calculation and the equivalent enthalpy drop method,and the result shows： in terms of incremental doing work,the result of this method is bigger than that of equivalent enthalpy drop method except the first heater and deaerator,and there are also some differences in the change of heat; the result of the detailed calculation is consistent with that of this method,which verifies the rightness of this method.

关 键 词：加热器 热经济性 热力系统 等效焓降法 

分 类 号：TP323[自动化与计算机技术—计算机系统结构]