A FUZZY CONTROLLED APPROACH FOR POWER PLANT CONVEYOR COAL FIRED BOILER SYSTEM

Project Abstract / Summary : Main essencefor the thermal power plants that may be either coal or natural gas power plants to be in command of the temperature and pressure controllers (PI.PD, PID) is generally employed. The raw material, coal is nosh in to the boiler using conveyer system and it is a time shifting one. This coordinated boiler turbine system is very complex process that is multivariable, nonlinear and also slowly time variant plant with hefty settling time. This is due to the unpredictable demand in the load side Also it makes the PI.PD, PID controllers to have very a reduced amount of efficiency. To make it as a high efficient one, the FUZZY LOGIC is used to control and it is a self and auto tuning process. FUZZY logic controller is used to control the temperature and pressure of the boiler without human intervention. Sensor materials like Temperature sensor (LM235) and pressure sensor (POTENTIOMETRIC TYPE) are used to sense the temperature and pressure. When the normal level of temperature and pressure value exceeds, it will give the signal to FUZZY controller. Then fuzzy logic controller that is used to control is worn the boiler system by given value to it by using its membership functions values. Since FUZZY logic controller is used, controlling sped is possible at any time Multi variable, non linearity and time varying and time varying of the unadventurous coal conveyor system can be easily eliminated. Unremitting controlling is applied by relay unit. Effectiveness is high compare with existing technology. Low temperature and pressure values can be set up in this strategy of FUZZY logic controller comparing with the conventional controller approach.

Why did you choose to work on this project topic : The coal level decreases day to day,the thermal power stations are waste the coal according to the load requirement.P,PID controllers are cannot respond quickly.So we are using fuzzy logic to the conveyor,It determines the coal level for the load,and also it monitor the boiler.

Project Highlights : This paper presents the new development of the boiler turbine coordinated control strategy using fuzzy logic and self tuning techniques. The boiler turbine System is a very multifaceted process that is multivariable, nonlinear, slowly time-varying plant with large settling time and a lot of suspicions. As there subsists strong couplings between the main stream pressure control loop and the power output control loop in the boiler turbine unit with large time delay and uncertainties, automatic synchronised control of the two loops is a very exigent problem. Boilers have colossal thermal mass and are relatively dawdling to react. Turbines are lissom and quickly answer an operator’s decree. Coordinating an entire plant requires a cherished acquaintance of both systems and selecting the right logic tools to fetch them together. The front end, in the argot of the power plant pedals engineer, comprises of the boiler unit and turbine unit. As mentioned in Part I of this two-part series, the operator’s window into the control system is referred to as a station or master, and it provides the operator boundary for a given control loop. Admittance to that loop is characteristically from a switch or hand station positioned on the control panel in elder plants or, more commonly, the operator’s upright in plants auspicious enough to be equipped with digital controls. In the boiler follow mode, the boiler is detached from the production control, which means the steam turbine utilizes stored vigour in the boiler to provide instantaneous load rejoinder The boiler must then revolutionize firing rate to bring pressure back to set point. In the turbine follow mode, Turbine control valves sustain a set pressure while the boiler fires to retain load. Hitch here is a slower generation rejoinder. There are variations with this scheme, in that the turbine control valves can be smarmy opened at higher loads to curtail the energy sentence associated with the DP slaughter across them. In that case, it has been called sliding-pressure control, or even surge control. In the harmonized control, in general, if we provide a choice of logic schemes to stir the steam turbine valves for quick load rejoinder, as well as fire the boiler for the predictable energy requests of the boiler (generally via an energy balance equation).This paper presents a new coordinated control strategy which is well thought-out a singular subclass of fuzzy Inference systems called the Gaussian partition with evenly (GPE) spaced midpoints systems is used to autodyne the main stream pressure.


Project Category : Electrical / Electronics / Communication
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Institute/College Name: M.KUMARASAMY COLLEGE OF ENGINEERING
City: KARUR
State: TAMILNADU
Participating Team From: Final Year

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