降低区域式天然气分布式系统的余热锅炉排烟温度的方案

A scheme to reduce the exhaust temperature of the HRSG in the regional gas distribution system

为了充分利用区域式分布式能源系统中的余热,应尽量降低余热锅炉的排烟温度。对于外供工业蒸汽负荷大且基本无回水的分布式供能系统,热力系统的补水需经过除氧处理后补入热力系统。补水除氧系统可采用大气式除氧器系统和真空除氧器系统两种系统,其与余热锅炉尾部增加热水的换热器相结合来降低余热锅炉排烟温度。通过对比采用两种不同除氧系统项目的性能参数可知,采用真空除氧系统方案的排烟温度会更低。

In order to make full use of waste heat in regional distributed energy system,the exhaust gas temperature of heat recovery steam generator(HRSG) should be minimized. For the distributed power system with heavy steam load but no return water,the water supply of the thermal system needs to be deoxygenated before supplemented into the thermal system. Deoxygenation and water feeding system can adopts atmospheric type and vacuum type systems,which can be combined with the hot water heat exchanger at the end of HRSG. It is a solution to reduce the exhaust gas temperature of the HRSG. Comparing the performance parameters of two different deoxygenation systems,it can be seen that the exhaust gas temperature of the vacuum deoxygenation system is lower.