Study On Energy System Simulation And Operation Optimization Of Supercritical Boiler

At present, with development of the steam pararneters and the installed capacity of the power plant, supercritical boilers are the main devices of thermal power units. In order to save the coal-fired plants’energy and improve energy efficiency, the management of the thermal power supercritical boilers’operation should be strengthened.Because of the supercritical boiler automation increased, which utilizes the power plant simulation technology to real-time energy efficiency boiler energy system has become possible. The previous system simulation using black box or gray box models based on data analysis methods cannot carry out characteristics of the system in theoretical analysis, but just regular summary. The article attempts to use the.mechanism approach to modeling the energy system of the boiler, more reliable simulation. The carbon in ash which is unable to realize real-time data acquisition is the key data of boiler efficiency for online calculation, and it is the main obstacle to the real-time online calculation of energy efficiency currently. In this paper, the relational combustion model, the relational coal particles model,the heating furnace internal heat transfer and the heating-surface convection heat transfer are introduced to the heat balance computing model of boiler. It establishes a complete functional relationship between entrance parameters of boiler system and C, and it makes the calculation of energy efficiency based on the measurable variable completely. Thus, the on-line energy efficiency computation becomes feasible. And on that basis, the theory on deviation analysis is introduced to calculate the change in overall energy efficiency of the boiler resulted from each single operating parameter deviate from the target value. Then the on-line real-time model for energy efficiency computation and quantitative analysis of the factors of the power plant pulverized coal boiler is established.With the help of Matlab software platform, a modular method is proposed to simulate the supercritical boiler energy system and to verify the rationality of the simulation according to the field data of600MW supercritical boiler in a power plant. Through the simulation of the furnace import’s adjustable parameters, the variation of energy consumption index of the entire boiler system is researched and the controlled parameter adjustment programs for energy saving under different conditions are investigated. Then optimize the reference value. The results showed that the controllability index optimize program by using of mechanism modeling method can reduce the utility boiler energy consumption to a certain extent, and improve overall plant efficiency, and provide guidance for the power plant energy-saving.