Monitoring And Application Research Of Coal-fired Hot-water Boiler

At present, new boiler systems in China are generally controlled by distributed control systems, and previous Conventional controlled boiler systems are also transformed with DCS. China University of Petroleum used SunnyPCC800 in a 3*17.5MW boiler. SunnyPCC800 Small Distributed Control System is made by the Supcon Company of ZheJiang University. And Principle and Process of the 3*17.5MW Coal-fired Hot-water Boiler were given in the paper. Refered to requirements of the boiler and parameters of many other control systems, 76 control points were set in this strategy. Each point has specific installation location, instrument standard type, range of control parameters as well as an exclusive DCS number. as the burning characteristic was considered in the dissertation, the temperature based optimization control scheme was adopted , and then the conditions should be met were anylysized as well as the control arithmetic.The paper analysed the development and application of domestic and international DCS control systemsdetaily, and researched in the Principles of DCS selection strategy. Since Super extending ability (about the I/O unit number) is not so needed in the boiler system of UPC, small distributed control system is suitable in this system, and ultimately the SunyPCC800 DCS were selected. Then the system hardware were selected, and the hardware,software and technical specification of the system were designed based on the in-depth investigation of the SunyPCC800 system. The paper also analysed security factors, jams, anti-jamming measures and redundancy (of many aspects) of the system in detail to meet the reliability demand of the boiler. The control scheme proposed in the paper can optimize the coal combustion control, reduce the work intensity, improve the combustion efficiency and enhance the operation security of boiler system. And the device operations well from December 2004 until now. The international advanced automatization technology were used in this system, hence the index of operation can meet the design commands.