Research On Fuzzy Control In Gas Collector Pressure Of Coke Oven

In the iron and steel enterprises, The coke quality and yield have a crucial impact on subsequent product production. Gas collector pressure is too high or too low will affect the quality of coke, And the stability of the coke oven gas collector pressure is an important guarantee of the normal production of coke oven, is the important role in the extending life of coke oven and in the prevention and control of environmental pollution. So the stability of the gas collector pressure in coke production is of great significance. It is an important measure to improving the quality of coke production, extending the service life of coke oven, saving energy and reducing environmental pollution.Multiple direct and indirect disturbances affect the stability of gas collector pressure in coking process. For example, when several coke ovens are connected in parallel, there are complex coupling relations between them. Therefore, the multi gas collectors pressure system of coke ovens is a complicated multivariable system, which is strongly disturbed, close coupled, nonlinear and time variant. Considering that an accurate mathematic model of such system is hard to be established, an intelligent control method based on fuzzy logic ratiocination is presented in this paper, which obtains the merits of fuzzy control, PID control and decoupling control.However, in the process of coke oven production, there are many interference factors affecting the stability of the gas collector pressure. As the Proven system, the four major coal pushing process of locomotive, blower and heating temperature and cycle will be disturbance on the formation gas collector pressure. Coke oven gas collector pressure control system, therefore, is one who has a strong nonlinear multi-variable and time-varying interference of complex control system. For precise mathematical model is difficult to establish system in the actual problem, this paper adopts the fuzzy control as the core, combining fuzzy control and PID control of the intelligent control method to achieve to control gas collector pressure system.Based on the production of the ShouGang Company, with the actual equipment running state as the research object, contacting actual demand of coke oven production process, combined with the related literature at home and abroad, it will be carried on the thorough analysis to the problem of gas collector pressure control.Firstly, because a single set of pipe loop is disturbance of rapid change, nonlinear, we design the fuzzy PID controller single loop of piecewise control system. When the system’s error absolute greater than determine beforehand, the system work in fuzzy control mode. When the system’s error absolute is less than or equal to the determine absolute, the system switch to the PID control mode. The method not only maintains the stability and robustness of PID control, but also introduces the merits of fuzzy control, namely fast dynamics characteristics and high intelligence.Secondly, after analyzing the asymmetry and coupling relations in multi gas collectors system, a fuzzy-decoupling control method is offered. Through constructing augmentation corrections, the method can realize the decoupling of the inside. Thus it can eliminate the mutual influences of two gas collectors pressure and guarantee the pressure of the proper range.Finally, the simulating models for gas collector pressure system and gas collector pressure control system is established under the condition of software MATLAB. By the comparison of PID control, fuzzy control algorithm, fuzzy-PID control method and the effect of fuzzy-decoupling control method, the rationality and validity of the presented control method were verified by simulating results.