Furnace pressure control method and device for annealing furnace

Abstract

The invention relates to a furnace pressure control method and device for an annealing furnace. The furnace pressure control method is applied to each furnace section of the annealing furnace, an injecting pipeline for injecting protection gas is arranged at each furnace section, and a flow controller is arranged on each injecting pipeline. The furnace pressure control method comprises the following steps that the current furnace pressure value of the annealing furnace is obtained, whether the furnace pressure value meets the pre-set furnace pressure range is judged, when the pre-set furnace pressure range is met, based on the furnace pressure value, the flow correction coefficient of the injecting pipeline in a target furnace section and the flow rating of the corresponding injecting pipeline, and the flow correction value for correcting the flow controlled by the flow controller on the corresponding injecting pipeline is obtained; and based on the flow correction value, correcting control is conducted on the corresponding flow controller, so that the furnace pressure of the annealing furnace is stabilized, and the quality of strip steel in the annealing furnace is ensured.

Description

technical field [0001] The invention relates to the technical field of cold rolling process, in particular to a method and device for controlling the furnace pressure of an annealing furnace. Background technique [0002] In order to prevent air from entering the furnace, the annealing furnace needs to maintain a positive pressure when producing galvanized sheets. Therefore, multiple channels of protective gas are introduced into the annealing furnace, and the protective gas flows into the furnace through the injection pipe at the bottom of the furnace. The flow control valve of the injection pipeline and the release valve on the top of the furnace are jointly adjusted to ensure a constant pressure in the furnace. The pressure setting in the furnace is mainly used to ensure the safety of the heating furnace. The gas pressure in the annealing furnace also affects The quality of the steel strip and the safety of the annealing furnace, if the furnace pressure is low, the effect...

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Problems solved by technology

[0002] In order to prevent air from entering the furnace, the annealing furnace needs to maintain a positive pressure when producing galvanized sheets. Therefore, multiple channels of protective gas are introduced into the annealing furnace, and the protective gas flows into the furnace through the injection pipe at the bottom of the furnace. The flow control valve of the injection pipeline and the relief valve on the top of the furnace are jointly adjusted to ensure a constant pressure in the furnace. The pressure setting in the furnace is mainly used to ensure the safety of the heating furnace. The gas pressure in the annealing furnace also affects The quality of the steel strip and the safety of the annealing furnace. If the furnace pressure is low, the effect of the reduction reaction cannot be effectively guaranteed. If the furnace pressure is too high, accidents and waste of protective gas will easily occur.

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