摘要
本文基于热耗变换系数的理论,进行数学推导,建立了定功率条件下低压省煤器对机组热经济性影响的数学计算模型。对低压省煤器热经济性原理和热耗变换系数法在低压省煤器中的应用进行研究,以国产300MW机组热力系统为例,分别计算了75%、100%THA下的节能量。研究表明,在100%THA和75%THA负荷运行时,低压省煤器机组热耗率分别降低39.88kJ/(kW·h)和33.95kJ/(kW·h),供电煤耗分别降低1.44g/(kW·h)和1.19g/(kW·h)。低压省煤器吸收的热量输入到给水回热系统后对机组循环吸热量将产生影响,可以为优化低省水侧管道连接提供参考。
Based on the heat rate convertible coefficient theory,a mathematical derivation was performed and a mathematical model for calculating the influence of a low pressure economizer on the thermal cost-effectiveness of its unit at a constant power output and applications of the low pressure economizer thermal cost-effectiveness theory and the heat rate convertible coeffient method in low pressure economizers were investigated. With the thermal system of a domestically-made 300 MW unit serving as an example,the quantities of energy saved were calculated respectively at the75% and 100% load under the condition of the turbine heat acceptance( THA). It has been found that when operating at the 75% and 100% load under the condition of the turbine heat acceptance( THA),the heat rates of the low pressure economizer unit can decline by 39. 88 k J /( k W · h) and 33. 95 k J /( k W · h) respectively and the power supply coal consumption rate can decrease by 1. 44 g /( k W · h) and 1. 19 g /( k W · h) respectively. The magnitude of the influence of the heat quantity absorbed by the low pressure economizer on the heat quantity absorbed in the cyclic processes of the unit after having being imput into the thermal system of the steam turbine was obtained,thus facilitating to optimize the connection with the pipelines at the water side of the low pressure economizer.
出处
《热能动力工程》
CAS
CSCD
北大核心
2016年第9期100-103,138,共4页
Journal of Engineering for Thermal Energy and Power
关键词
定功率法
低压省煤器
机组热经济性
热耗变换系数
constant power method
low pressure economizer
thermal cost-effectiveness of a unit
heat rate convertible coefficient
