Method for stabilizing blast furnace operation based on equilibrium point

Abstract

A method for stablilizing blast furnace operation based on balancing point is used in blast furnace ironmaking field. Blast furnace is controlled utilizing balance point in the invention. Firstly, choosing blast furnace spot data and denoting blast furnace balance point using multiplication of theoretical burning temperature bosh coal gas volume, then determining balance point influencing factor, using determined balance point influencing factor as input value, balance point as output value and choosing blast furnace spot data, learning rate being 0.30 from input layer to hidden layer, learning rate being 0.15 from hidden layer to output layer, momentum coefficient being 0.35, transformation function being tangent hyperbolic function , setting blast furnace balance point artificial nerval net prediction model, at last matching blast furnace valid data using nerval net exercise sample data, getting non-linear relationship of balance point with each blast furnace factor, controlling blast furnace according to non-linear relationship and blast furnace balance point value. Balance point data can guarantee the stable operation of blast furnace.

Description

technical field [0001] The invention relates to a method for stabilizing blast furnace operation, in particular to a method for stabilizing blast furnace operation based on an equilibrium point, which is used in the technical field of blast furnace ironmaking. Background technique [0002] With the large-scale blast furnace and the higher and higher requirements for the blast furnace life, there is an urgent need for the blast furnace to work normally and stably. But high productivity and long life of blast furnace are often opposite in real-time operation. For the existing blast furnace, when the design of the blast furnace body, raw material status and equipment status remain unchanged, the most important issue is how to stabilize the operation of the blast furnace, that is, how to reduce the fluctuation of the blast furnace. As we all know, the level and stability of the heat level in the lower part of the blast furnace is one of the important factors for the normal and ...

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Problems solved by technology

[0003] After searching the literature of the prior art, it was found that in the "Production Practice of Controlling Theoretical Combustion Temperature" published by Lu Huamin and Li Ziqiu in "Ironmaking" No.3, 1991, 43-46, the article introduced: "Equilibrium point" Theoretical combustion temperature T before the available tuyere f to measure, that is, adopt the empirical formula for all blast furnaces: T f =1570+0.808T 风 -5.85W 湿 -4.4W 油 +4.37V 氧 -(2.37-2.75)W 煤 , which is a linear relationship, while the changes in the blast furnace are unstable, the relationship between the internal parameters is nonlinear and each blast furnace effective volume and production conditions are different, a unified and simple relationship cannot summarize the changes in the blast furnace

At the same time, with the large-scale development of blast furnaces, the "furnace waist disease" has become more and more serious, and the furnace wall has thickened from time to time. Only T f It is not enough to represent the heat in the lower part, because many blast furnaces only pay attention to T f But ignoring the gas flow in the lower part of the blast furnace will cause the hearth of the blast furnace to be inactive and the furnace wall to be thick

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