Research Of Main Boiler Distributed Control System For Marine Steam-Power Plant

The main boiler system for marine steam-power plant is one of the two main systems of heavy-duty marine steam-power plant.It consists of a series of subsystems.These subsystems have the features of distributing parameter and multivariable coupling.It needs a complicated process control in the operating process. Currently the research of those is only limited to monitoring and alarm by the DCS(Distributed Control System),but it isn't a mature control system platform with the computer technology.Based on the engineering practice,some researches have been done in the monitoring and control system of main boiler for marine steam-power plant.The main work is as follows:1) Main boiler control system of characteristic analysis and research on algorithm.On the basis of analyzing the characteristics of marine boiler control system,decoupling control is used to the complex system,with dividing it into each individual sub-system.Some control system are studied to use the different control algorithm,include water-level control system,deaerator and condenser water-level associated control system,steam turbine and main boiler coordinated control system,combustion control system.A good effect are given on the control results.2) Equipment option and system design.By investigation and practice,a medium or minitype DCS for marine main boiler control system is designed.That system chooses the CENTUM CS1000 of Yokogawa Electric Corporation and adopts the general personal computer as operating platform.It is a really open architecture system.3) DCS software configuration.DCS configurations methods are discussed in detail in this thesis,including confirming of the project item file,the module configuration of field control station,configuration connection of function block in several important control circuits,communication of the data as well as configuration work of monitoring window and process alarm window.