Method for controlling pressure of silicon steel continuous annealing furnace separation section

Abstract

The invention provides a method for controlling the pressure of a silicon steel continuous annealing furnace separation section. The method comprises the steps that the pressure P01 of a first furnace area, the pressure P02 of a second furnace area and the gas pressure P12 of a first furnace separation section are measured by a pressure transmitter and transmitted to an PLC control system; the PLC control system executes a PID parameter fuzzy-self-tuning program, PID parameters are obtained through calculation, then a PID controller outputs MV, and the MV is transmitted to a correlation computing controller; the PLC control system obtains a correction parameter J12 of a relief valve of the first separation section, finally, the output opening MV12=J12*MV of the relief valve of the first separation section is calculated through the correlation computing controller, and the MV12 calculation result is given to the relief valve of the first separation section to adjust the gas pressure of the separation section. On the condition of ensuring the air flow separation effect and the micro-positive pressure state of the separation section, the nitrogen protecting program starting frequency is reduced so as to reduce interference on pressure and gas in a furnace.

Description

technical field [0001] The invention belongs to the field of control methods for furnace section atmosphere barrier in silicon steel heat treatment process, and in particular relates to a furnace pressure control method in the isolation section of a silicon steel continuous annealing furnace. Background technique [0002] According to the heat treatment process of silicon steel, the dry atmosphere and wet atmosphere furnace section, the nitrogen-hydrogen mixed atmosphere furnace section with various ratios, the heating section and the cooling section all need to be isolated from the atmosphere. Pressure difference is achieved, so it is necessary to set up a sealing device for furnace pressure control. At present, the device used for the atmosphere isolation of the furnace section on the silicon steel line is composed of an isolation baffle, a release pipe and a release control valve, but the control method is single, mainly by forming a closed loop for adjustment of the furn...

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Problems solved by technology

At present, the device used for the atmosphere isolation of the furnace section on the silicon steel line is composed of an isolation baffle, a discharge pipe, and a discharge regulating valve, but the control method is single, and the main method is to form a closed loop to adjust the furnace pressure in the isolation section and the discharge regulating valve.

However, this control method has the following problems: first, a single closed-loop adjustment, it is difficult to ensure a good furnace pressure difference under any circumstances, and it is difficult to achieve good isolation of the atmosphere; At the same time, the pressure of the furnace section will inevitably cause fluctuations in the furnace pressure of the surrounding furnace sections. When the annealing furnace needs to configure isolation section control for the atmosphere of multiple furnace sections, the independent control method of this isolation section will inevitably lead to a larger furnace section. Pressure fluctuations, which in turn affect the gradient and stability of the furnace pressure

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