小机凝结水系统改造对空冷机组经济性的影响

摘要

Air cooling technology provides a good solution for the thermal power generation in the area of coal rich and water shortage,but the traditional air cooling unit has some problems such as the vacuum of condenser is low and the summer output is limited.In order to make full use of the small turbine setting water cooling capacity,the modification scheme of the condenser throat of condenser water nozzle is put forward.The thermal system is calculated by the equivalent enthalpy drop method,the results indicate that,the spray water can improve the thermal efficiency of the unit compared with the hot water returning mode,and the variation of thermal efficiency is related to the load of the unit and the flow of the condensate water, and the temperature.%空冷技术为富煤缺水地区的火力发电提供了良好的解决方案,但传统空冷机组存在凝汽器真空低、夏季出力受限等问题.为了充分利用小机凝结水冷量,提出小机凝结水喷嘴雾化进入主机凝汽器喉部的改造方案.采用等效焓降法对改造前后的热力系统进行计算,结果表明,与热井回水方式相比,雾化回水能够提高机组的热效率,热效率变化量与机组负荷以及小机凝结水流量、温度等因素有关.