Strategy Research Of The Circulating Fluidized Bed Boiler A Fan Online Self-tuning Fuzzy Control

The circulating fluidized bed combustion technology is one of the clean coal combustion technology,Particularly it adapts to burn high-ash,High-sulfur, low volatile (such as gangue) etc, and conventional pulverized coal is difficult to adapt to the poor quality of fuel.,Advantage of the furnace low-cost Efficient desulfurization and low NOX emissions.The rapid development of circulating fluidized bed boiler,Capacity of increasingly large,It changes power structure in China’s and plaies an extremely important role in the use of the energy cascade.One of the main problems in the circulating fluidized bed boiler is a fan energy consumption,This is mainly caused by two reasons:First, the primary air fluidized solid material of bed, a fan pressure head high;Second, the primary air adjustment method is not economical,A fan of the circulating fluidized bed boiler is almost all of the entrance baffle adjustment.Fuzzy control is a new PID control technology and artificial intelligence control. With the complexity of the control object and control process,Non-linearity, hysteresis,Coupling increases,Performance of classic PID control is poor.Fuzzy control is based on the human mode of thinking,Using advanced computer technology,Knowledge or rules of human natural language expression converted into digital or mathematical functions,Automatic control by computer language simulation operating of human.This article in view of the circulating fluidized bed boiler is a fan of the problems existing in the control, Put forward an online self-tuning fuzzy PI control strategy,Automatic control of the primary air fan.First, according to the operational characteristics of the circulating fluidized bed boiler,Determine the primary air flow and bed pressure drop with the boiler load variation;By the bed pressure drop and air flow to determine the primary air fan baffle opening;Calculation of the resistance characteristics of smoke air system to determine the prime pressure; Based on a fan performance curve, Combined with the principle of the similar operating condition,According to calculations and then come to the speed of.fan.By adjusting the fan baffle and inverter,Control the flow and speed of the fan.Open degree of the fan baffle and fan speed error and its rate of change as the input.Basis of fuzzy rules,Online self-tuning PI controller parameters of the KP, KI,Real-time control of the fan.Simulation results show that,Compared to online self-tuning fuzzy PI control with conventional PID control,Fast response,Small overshoot,Short adjustment timeHas good dynamic and static stability.