300MW火力发电机组DEH系统升级实例

Upgrading of DEH System for 300 MW Thermal Power Generating Unit

目前,电厂自动化系统日益进步,对各个子系统的安全和性能要求也越来越高,而DEH系统作为火力发电厂主要汽轮机控制与保护系统,其正常运行与否直接关系到机组的安全、稳定、经济运行。吴泾热电厂300 MW机组于1991年正式并网发电,至今已投入运行26年。设备日益老化,故障也日渐增多,无法适应当前电厂自动控制和保护的需求。同时,备品备件厂家已经停产所以无法采购,即使可以采购的价格也非常昂贵。因此,文章中提出方案并在检修期间对机组DEH系统进行了升级改造。

At present,the power plant automation system is improving day by day. Safety and performance requirements of each subsystem are increasingly high. As a thermal power plant main steam turbine control and protection system,the normal operation of DEH system is directly related to the safety,stability and economic operation of the unit. The 300 MW unit of Wujing cogeneration power plant was formally connected to power grid in 1991 and it has been in operation for 26 years. The equipment is aging day by day,and the malfunction is increasing,so it can＇t meet the demand of the automatic control and protection of the power plant.At the same time,spare parts manufacturers have been discontinued,so they cannot be purchased,even if you can purchase the price is also very expensive. Therefore,the paper puts forward the plan and upgrades the unit DEH system during the overhaul period.