Design And Development Of Chemical Water Treatment Control System In Thermal Power Plant

The automatic control system for chemical water of thermal power plant is designed in this article. Because water plays an important role of transferring the energy and cooling medium in the process of generating electricity, chemical water treatment is very important. Its safe, reliable, efficient running has deeply affected the safety and using life of boiler, turbine and so on. The study of chemical water treatment system has been highly regarded by the concerned experts and factories all along.The paper introduces the design of automatic control system and computer supervisory system by means of industry control configure software in water treatment of thermal plant, based on the rebuilding of water treatment in Tieling Power Plant. Firstly, it analyses the schedule of chemical water treatment system.Then it presents the control scheme according to the requirement of control system. It designs four subsystems of whole control system, including prior treatment firewater subsystem, supplying water subsystem, neutralizing pool subsystem and coagulating water subsystem.Every subsystem is a suit of absolute PLC control system. The programming is programmed using CX-Programmer software for each subsystem. The water treatment local area network is formed using Ethernet network technology. The InTouch software is used to draw supervisory pictures. The supervisory pictures include system pictures, trend pictures, alarm pictures, accessorial pictures, and so on. It presents the functional description also.Because of complexity, multi-indeterminacy and un-described nonlinear of automatic adding medicament system, the paper introduces a new control strategy in adding medicament by using fuzzy control. Simulation is studied by collecting the historical data from field engineering. And the simulation results illustrate that the method can settle the delay and nonlinear question of PH neutralizing process effectively.