An acid concentration controlling method for a continuous annealing furnace

Abstract

The invention discloses an acid concentration controlling method for a continuous annealing furnace. The method comprises the steps of: placing an on-line conductivity meter in a standard solution with a temperature T1 to detect the conductivity K1 of the standard solution at the temperature T1, then heating the standard solution to a temperature T2 to detect the conductivity K2 of the standard solution at the temperature T2, and obtaining a conductivity compensation factor alpha of the on-line conductivity meter according to a model; by using the on-line conductivity meter, detecting the conductivity of an acid solution in the continuous annealing furnace at a current temperature T as K0, and based on the above conductivity compensation factor alpha and the measured conductivity K0, obtaining the actual conductivity KT of the acid solution at the current temperature T; determining the concentration N of the acid solution at the current temperature T by employing a model; and comparing the above concentration N with a concentration control target value of the acid solution, and regulating an acid inlet valve and a water inlet valve to enable the acid concentration N to be infinitely close to the concentration control target.

Description

technical field [0001] The invention relates to a metal smelting process, in particular to an acid concentration control method for a continuous annealing furnace. Background technique [0002] The horizontal furnace for continuous annealing is a relatively common heating furnace, which can eliminate the stress of the strip steel and improve the performance of the strip steel by heating the strip steel. Due to the high temperature in the furnace, the surface of the strip steel will be oxidized to varying degrees after heating. In order to eliminate the oxide layer, a pickling section is generally added after the annealing furnace to pickle the strip steel. The quality of pickling will directly affect the quality of the finished steel. The quality of pickling is not good, and the oxide layer has not been completely eliminated, that is, the effect of strip steel entering the pickling section will not be achieved, which will affect the process adjustment of the subsequent proc...

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Problems solved by technology

[0004] (1) When using these methods to test, it is necessary to configure standard solutions, especially when using visible spectrophotometry, generally a color reaction is required, and the test operations are relatively cumbersome;

[0005] (2) More importantly, such assay methods cannot be carried out online, and there is always a certain time interval between the test results and sampling, so that the acid concentration cannot be controlled in real time to ensure the quality of pickling; therefore, these methods can only be used as A means of post-mortem detection

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