| At present, the Commissioning of medium and large-capacity circulating fluidized bed boilers(CFB) are increasingly growing in number at Domestic. The Distributed Control System(DCS) was presented to monitor the unit`s operation of these projects. The application of DCS in program control of the pulverized coal fired boiler has been very mature, and the automation and safety level is high. But for the CFB, it has complex combustion system, the tight coupling among system variables, and these system variables are badly non-linear. According to the user’s high technical requirement in CFB process, advanced DCS should be supplied to satisfy the performances, so research in the implementation of DCS is significant.A boiler island project which include two 90 t/H CFB and a 50 mw steam turbine unit in the project of central heating in Petrochemical district is taken as background。The paper main content is as follow:1. The paper introduced the present situation and the development trend of domestic CFB and its DCS control2. The paper state the Control strategy of CFB and the feed-water cascade control systems for CFB units was introduced in detail. And then the paper introduced the corresponding DCS configuration diagram.3. The paper state the main structure of the DCS in CFB and has further statement on each of parts.4. The paper state the design and implementation of DCS in CFB5. The paper state the energy conservation transformation of high voltage inverter to the main feed water pump and secondary air fanIn this project, DCS helped to realize the whole process of CFBreached the high automation level, improved the economy of units’ operation on xinhua DCS system.DCS helped to realize the data connection between the unit, provided a powerful online performance inspection and guidance, provided accident analysis method and online maintenance of convenience and efficiency. DCS helped to lay a good foundation for the future plant-level integrated control, production process automation. |
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