蛇形管高压加热器用于1000 MW二次再热机组的可行性分析

Feasibility Analysis on the Application of High Pressure Serpentine Heater in 1 000 MW Coal-fired Power Plant with Double Re-heating Cycles

随着1 000 MW二次再热机组设计参数越来越高、采用传统单列U形管高压加热器也越来越受到限制,当前新上二次再热机组不得不采用双列U形管高压加热器,从而使得主给水系统复杂、运行困难。结合U形管高压加热器,对比分析了新型高压加热器(即蛇形管高加)技术特点及国产化现状,指出在1 000 MW二次再热机组应用蛇形管高压加热器是可行的,并具有结构及系统简单、热适应性好、可靠性高等优势,推荐在同类工程中应用,为适应末来更高参数超超临界机组的高压加热器制造技术发展打下基础。

Due to the pursuit of higher design parameters in 1 000 MW power plants with double re-heating cycles,the traditional single row high pressure U-tube heater was strongly restricted since it could not meet such high parameters. As a result,the double row high pressure U-tube heater was introduced to newly constructed double re-heating units,which in turn leads to greater system complexity and operation difficulty regarding to the main feed water system. The present paper conducted the characteristic and localization domestication comparison between the new high pressure heaters （ i. e. high pressure serpentine heater） and high pressure U-tube heater,results showed that： it is feasible to apply high pressure serpentine heater in 1 000 MW power plants with double re-heating cycles,considering its good system simplicity,excellent thermodynamic adaptability as well as high operation reliability. Moreover,it is recommended to apply the high pressure serpentine heater in similar engineering domains,as it will lay a firm foundation for manufacturing high pressure heaters in ultra-supercritical units with higher design parameters in the near future.