Furnace pressure control system and control method for automobile steel production by using open-flame continuous annealing furnace

Abstract

The invention relates to a furnace pressure control system and control method for automobile steel production by using an open-flame continuous annealing furnace. The furnace pressure control system includes a pneumatic controller, a pneumatic valve locator, a smoke gate, a furnace pressure sensor, a smoke exhaust suction sensor, a frequency converter, a variable-frequency fan, and a PLC system. The pneumatic controller receives the pressure output by an analog output module AO of the PLC to the pneumatic valve locator, and controls the opening and closing of the smoke gate. The furnace pressure sensor converts the instantaneous furnace pressure into an input current of an analog input module AI and transmits the input current to the PLC system. The smoke exhaust suction sensor converts the instantaneous smoke exhaust suction force in the flue into an input current of the analog input module AI and transmits the input current to the PLC system. The frequency converter receives an output current from the AO of the PLC system as a control variable, and makes the rotation speed of the variable-frequency fan high enough to control the smoke exhaust suction force. The beneficial effectsare as follows: the problem of negative-pressure oxidation in the furnace under temporary stoppage and the problem of pressure fluctuation in the furnace during wide-range load adjustment in the open-flame section can be solved, the loss of refractory materials in the furnace can be reduced, and the production quality of automobile steel products can be improved.

Description

technical field [0001] The invention relates to a furnace pressure control technology in the technical field of metallurgical furnaces, in particular to a furnace pressure control model for the production of high-grade automobile steel in an open flame continuous annealing furnace. Background technique [0002] Production of high-grade galvanized automotive steel, currently mainly used in full radiant tube annealing furnaces. It will take a lot of money to transform the annealing furnace with an open flame section into a full radiant tube annealing furnace. If it is not modified, the destruction of the non-oxidizing atmosphere in the furnace during the temporary stop (small stop) of the production line will affect the production of high-grade automotive steel products. [0003] To maintain the furnace pressure of the open flame annealing furnace, except for a part of the process protection gas of nitrogen and hydrogen, the main way to establish the pressure in the furnace i...

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Problems solved by technology

[0005] The invention provides a furnace pressure control system and control method for the production of automobile steel in an open flame continuous annealing furnace, which can solve the problem of negative pressure oxidation in the furnace when the production line is temporarily stopped (small stop) and the pressure in the furnace when the load in the open flame section is adjusted in a large range To solve the fluctuation problem, maintain the pressure balance in the furnace of the open flame section, ensure or minimize the duration of negative pressure in the furnace, effectively prevent the entry of oxidizing atmosphere and polluted atmosphere, reduce the loss of refractory materials in the furnace, and improve the safety of automobile steel products production quality

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