双工况燃机进气冷却测控系统设计

为了提高燃机在酷热夏季的出力,研发了具有双工况工作模式的进气冷却系统。该系统利用烟气余热作为动力,不仅在夏天制冷工况下能对燃机进气进行充分冷却,有效提高燃机效率;而且在冬天低压加热工况下驱动低压加热器产生热水,提升余热锅炉的给水温度,以提高汽轮机的功率。该系统的测控系统基于DCS框架构建,并根据实际情况简化为两层结构：集中控制层和过程控制层。上位监控软件用DELPHI软件自主开发,通过自主开发的OPC控件,实现了对下位PLC控制器的实时读写操作。使用结果表明,该套测控软件不仅界面美观,操作方便,而且对数据处理具有独到的优越性。

Development of measurement and control system for double-operating-condition gas turbine inlet air cooling system

In order to enhance the efficiency of combustion turbine in summer,two sets of an inlet air cooling system(IACS) were installed in PG6551(B) combustion turbines in Jinhua,Zhijiang,China.Two low-pressure evaporators were installed in the caudal flue of the waste heat boiler,therefore,the saturation steam produced by them drove a single-effect lithium bromide absorption chiller to cool the inlet air of combustion turbines to raise the output power of combustion turbine in summer;or supplied the low-pressure heater to heat the condensated water from the deaerator of the steam turbine in winter.According to the ambient temperature,the IACS alternated between the inlet air cooling mode and low-pressure heating mode.A measurement and control(M&C) system of the new-added inlet air cooling equipments was developed.Based on the framework of DCS(Distributed Control System),the M&C system has the IACS work correctly and easily.An OPC ActiveX component developed by authors has fulfilled the asynchronous reading and writing operation.The structure and functions of the M&C is described in detail.