雾化补水对直接空冷机组的热经济性影响分析

Thermal Economy Analysis of Atomized Make-Up Water for Direct Air-Cooling Unit

直接空冷机组因背压较高,增加了冷源损失,影响了机组的热经济性。热井补水对减少冷源损失影响很小,为此提出对直接空冷机组采用雾化补水。将补水方式由直接进入热井改为在排汽管道内适当位置雾化后再进入热井,基于等效热降理论,建立了雾化补水物理模型和热经济模型,以NK600-24.2/566/566型机组为例,在不同工况下,分别计算雾化补水和热井补水方式的热经济性。计算结果表明:采用雾化补水提高机组热经济性是可行的;与热井方式相比,雾化补水能够减少冷源损失,提高机组热经济性,实现机组节能降耗的目的。

For direct air-cooling unit,the higher back pressure increases cold source loss and affects the thermal economy of unit.Make-up water through hot well had little affection on reducing cold source loss,so atomized make-up water was proposed for direct air-cooling unit,which changed make-up water method from entering hot well directly to entering hot well after it was atomized at the appropriate location within the exhaust pipe.This paper built the physical model and thermal economy model of atomized make-up water based on equivalent enthalpy drop method,and calculated the thermal economy of the two make-up water methods under different working conditions with taking NK600-24.2/566/566as example.The result verifies the feasibility that atomized make-up water can improve the thermal economy of unit.Compared with hot well method,atomized make-up water can reduce cold source loss,improve thermal economy of unit and achieve the purpose of energy savins.