Closed Loop Control System Of Submerged Arc Funace Gas Recovery

With the increasingly rapid industrial development, China's industrial air pollution has become increasingly serious, submerged arc furnace dust generated in the smelting is a very typical industrial waste gas, which is characterized by large amount of exhaust gas, high temperature, high concentrations of dust And some highly toxic gas also direct emissions on air environmental risks are very large. The reasonable use of submerged arc furnace exhaust, increase gas recovery, environmental protection has become a need to study and solve important issues.High-carbon ferrochrome of Jilin Ferroalloy plant furnace gas recovery system is manual control, although able to reach more than 90% recovery rate, but energy dissipation and labour consuming.Therefore, the existing conditions in the gas recovery system based on closed loop control is very significant.The Submerged Arc Furnace Gas Recovery System because of large inertia, nonlinear and time variation, difficult to obtain accurate mathematical model. In this regard, the conventional control methods are often difficult to work, and fuzzy control does have very good results. In the gas recovery process, both the role of each input to its output, is a double input double output cross coupling system, thus making the process more complicated. To deal with the coupled system, in which fuzzy decoupling control system is proposed to achieve low power consumption, low pollution, high efficiency of gas recovery.The main works and achievements in this paper are as follows:(1) In order to achieve closed loop control system, gas recovery's data collection is an indispensable part, we use the PCI-8310 data acquisition card of the blast furnace data collection, but the wind from the blast furnace room location far, so using the RS-485 network Data transmission;(2)On the use of industrial control computer as higher level computer that collect and analysis blast furnace data, Lower level computer complete collect data of fan. Higher level computer charge monitoring process parameters, alarm, system parameter settings, reports, print archive, and control algorithms by the Kingview software.(3)This paper analyzes the return valve, tube's mouth position and furnace pressure, Venturi tube differential pressure between large delay the nonlinear coupling relationship the use of fuzzy control algorithm to establish its control, Achieved through the fuzzy decoupling method Venturi furnace pressure and Venturi tube differential to decouple, finally, compensation tables added to the output of fuzzy control.(4)Simulation was carried out in recognition of the mathematical relationship between input and output after, the results show that the proposed scheme is reasonable and advanced. The data prove that last run, the controller improves the system's anti-jamming capability, ensure the system stability and the high recovery rate, greatly reducing air pollution.