循環(huán)流化床鍋爐燃燒系統(tǒng)優(yōu)化控制的研究與實(shí)現(xiàn)
文內(nèi)圖片:
圖片說(shuō)明:主蒸汽壓力前饋控制 SAMA 圖
[Abstract]:As a new combustion mode, circulating fluidized bed (CFB) boiler combustion technology has been widely used in electric power, heating and industrial steam production because of its high combustion efficiency, wide range of fuel adaptation, good load regulation performance, desulphurization in furnace tissue and so on. However, the combustion system of CFB boiler is a controlled object with distributed parameters, nonlinear, time-varying, large lag and multivariable coupling. Combustion control is difficult and automatic operation rate is low. Therefore, it is of great practical significance to study the optimal control of CFB boiler combustion system. In this paper, the structure and combustion characteristics of circulating fluidized bed boiler combustion system are analyzed, its main characteristics include large inertia, strong coupling, nonlinear and so on. On this basis, the control method of main thermal parameters of combustion system is studied. Although the mechanism modeling technology has been very mature, the model obtained by mechanism modeling is not suitable for controller optimization. Therefore, before designing the optimal control strategy, the experimental modeling of the system is carried out by using the historical data of the unit and the simulator system. In view of the fact that the experimental modeling process of combustion control system is a complex optimization problem that needs to identify multidimensional variables, ant colony optimization algorithm is adopted in this paper, which lays a good foundation for the later experimental modeling. In the next work, according to the general method of experimental modeling, the transfer function of the model is obtained by using the above ant colony optimization algorithm, and other data independent of the identification data are used to verify the effectiveness of the transfer function of the model. Finally, the SAMA diagram of the bed temperature control loop and the main steam pressure control loop in the original DCS is optimized by using the rapidity of the primary air regulation to control the bed temperature and the main steam pressure control circuit by adjusting the supply speed of the coal feeder, and the principle of feedforward compensation control is applied to the combustion system control. Combined with the above control scheme and the identified object model, the ant colony optimization algorithm is used to optimize the controller parameters. By comparing the control effect diagram before and after optimization, the optimized control system can not only improve the automation level of boiler control system, but also play an important role in reducing emission and energy utilization.
【學(xué)位授予單位】:華北電力大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TP273;TM621.2
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