Heating furnace hearth pressure and exhaust gas temperature control method and system and medium

Abstract

The invention provides a heating furnace hearth pressure and exhaust gas temperature control method which comprises the following steps: determining input quantity of fuzzy control, the input quantity being furnace pressure control deviation and exhaust gas temperature control deviation; carrying out fuzzy segmentation on the input space and the output space of fuzzy control; fuzzifying the furnace pressure control deviation and the exhaust gas temperature control deviation; determining a membership function of the fuzzy set; determining a control rule of a fuzzy controller and a fuzzy mapping relation corresponding to the control rule; and according to the gas header pipe pressure change value and the combustion-supporting air header pipe pressure change value, determining the smoke exhaust regulating valve control compensation amount, and controlling the heat furnace hearth pressure in a feedforward mode. The invention provides a scheme for dynamically adjusting feedforward control and feedback control weights of the furnace pressure of the heating furnace, and a control program for fuzzy control of the furnace pressure is autonomously learned; the stability of hearth pressure is greatly improved, and safe and stable operation of the heating furnace is guaranteed; theoretical analysis and practice show that the production energy consumption is reduced.

Description

Technical field [0001] The present invention relates to the technical field of combustion control system for steel heating furnace, and in particular, to a heating furnace pressure and exhaust temperature control method based on a variable blurred interval. Background technique [0002] In the heating furnace process control, it is controlled by: steel temperature, heating time, air-fuel ratio, furnace temperature and furnace pressure and other variables; there is also a change in gas pressure and flow, changes in air, and the heat of gas Variable changes such as changes. Therefore, during the heating of the billet, it is necessary to achieve the control heating steel temperature to reach the rolling requirements by controlling the pressure of the air and the flow rate, the pressure of the gas and the flow of the gas. Therefore, the heating furnace control process has a multivariable, mutual coupling characteristics. [0003] As a multi-target control system, the shorter the heat...

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Problems solved by technology

[0005] 1. The heating furnace is a pure hysteresis, nonlinear, time-varying, large inertia, strong coupling and multivariable control system. Feedback adjustment is performed on the smoke control valve based on the detection of furnace pressure. Often the control effect cannot be displayed immediately, which is likely to cause control problems. Disordered situation

[0006] 2. Frequent adjustment of the smoke control valve is also very obvious to the loss of equipment, which speeds up the equipment replacement cycle and puts forward high requirements for operation and maintenance work

[0007] 3. The control system adopts the PID control method to adjust, and the PID control often produces different overshoots and system steady-state errors under different working conditions, which further reduces the control stability of the furnace pressure

[0008] 4. When a single detection target is used, if the pressure sensor fails, the entire control system cannot perform feedback adjustments, and there is a great control hidden danger

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