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Strip steel efficient descaling device and method

A descaling device and strip steel technology, which is applied in the direction of drying gas arrangement, lighting and heating equipment, workpiece surface treatment equipment, etc., can solve the problems of substandard superheated steam temperature, low recovery rate of hydrochloric acid, insufficient drying of strip steel, etc. , to achieve the effect of reducing the amount of acid mist treatment, alleviating environmental pressure, and reducing environmental pressure

Inactive Publication Date: 2019-08-30
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the pickling efficiency of the conventional pickling unit and process needs to be further improved by assisting other processes; the acid mist of different concentrations in the pickling tank is processed through the acid mist recovery system, the treatment pressure is high, the effect is poor, and the environmental protection pressure is high. The recycling rate of hydrochloric acid is low; moreover, in the actual production process, it often occurs that the heat transfer efficiency of hot air drying is not enough or the temperature of superheated steam is not up to standard, resulting in insufficient strip drying

Method used

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  • Strip steel efficient descaling device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Open the valves of the pump and circulation tank, and fill the three pickling tanks with liquid. In this embodiment, the scale of the incoming steel grade contains 2.3% silicon, and the thickness of the scale is 18um. It is divided into three layers. The innermost layer is For iron silicon oxide, turn on 12 groups of ultrasonic generators, and the ultrasonic waves will generate instantaneous strong shock waves and micro jets near the surface of the strip, which will peel off the oxide skin on the strip. At the same time, ultrasonic waves will strengthen the replacement of acid solution on the surface of the strip, creating extreme physical and chemical conditions, enhancing the pickling effect and reducing acid consumption;

[0034] 2) The concentration of hydrochloric acid in the three pickling tanks is respectively stable at 4%, 8% and 12%, the temperature of the acid solution is 60° C., and the rinsing temperature is 40° C. to clean the strip steel. The process imp...

Embodiment 2

[0038] 1) Open the valves of the pump and circulation tank, and fill the three acoustic pickling tanks with liquid. In this embodiment, the incoming steel scale contains 2.3% silicon and 2% manganese, and the thickness of the oxide scale is 16um, which is divided into three layers. Outer Fe 3 o 4 The thickness is 8.65um, the thickness of the middle layer FeO is 5.57um, and the innermost layer is iron silicon oxide. Turn on 9 sets of ultrasonic generators, and the ultrasonic waves will generate instantaneous strong shock waves and micro jets near the surface of the strip, making the strip on the peeling off of oxide skin. At the same time, ultrasonic waves will strengthen the replacement of acid solution on the surface of the strip, creating extreme physical and chemical conditions, enhancing the pickling effect and reducing acid consumption;

[0039] 2) The concentrations of hydrochloric acid in the three pickling tanks are respectively stable at 6%, 10% and 11%, the tempera...

Embodiment 3

[0043] 1) Open the valves of the pump and circulation tank, and fill the three pickling tanks with liquid. In the present embodiment, the scale thickness of ordinary carbon steel in the scale of incoming steel is 21um, which is divided into a typical three-layer scale structure. Turn on 8 sets of ultrasonic transmitters, and the ultrasonic waves will generate instantaneous strong shock waves and micro jets near the surface of the strip, which will peel off the oxide skin on the strip. At the same time, ultrasonic waves will strengthen the replacement of acid solution on the surface of the strip, creating extreme physical and chemical conditions, enhancing the pickling effect and reducing acid consumption;

[0044] 2) The concentration of hydrochloric acid in the three pickling tanks is respectively stable at 2%, 6% and 14%, the temperature of the acid solution is 85° C., and the rinsing temperature is 60° C. to clean the strip steel. The process implementation parameters are as...

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Abstract

The invention relates to a strip steel efficient descaling device and method. The device comprises a first pickling tank, a second pickling tank, a third pickling tank, a first spraying rinsing tank,a second spraying rinsing tank and a radiation hot air drying system; the tank bodies of the first pickling tank, the second pickling tank and the third pickling tank are internally provided with ultrasonic vibrators, the ultrasonic vibrators are arranged above and below a strip steel, or are arranged on the side walls of the tank bodies, and the ultrasonic vibrators are connected to an ultrasonicgenerator; and the descaling device further comprises an online acid mist recycling system, wherein the online acid mist recycling system uses rinsing water of the first spraying rinsing tank to absorb acid mist of the third pickling tank to form an acid solution for supplementing the first pickling tank. The strip steel efficient descaling device and method mainly aim a hydrochloric acid-based pickling unit, the pollution of high-temperature high-concentration hydrochloric acid to the environment is reduced, the cleaning speed is increased, the acid consumption is reduced, and then the high-surface-quality strip steel is obtained.

Description

technical field [0001] The invention relates to the technical field of strip steel surface cleaning, and more specifically relates to a high-efficiency descaling device and method for strip steel. Background technique [0002] The surface quality of strip steel is one of the key factors affecting the improvement of product performance. A layer of dense metal oxide film, commonly known as scale, will be formed on the surface of the strip during hot rolling, which will seriously reduce the surface quality of the strip and aggravate the wear of the roll. [0003] In view of the influence of the above-mentioned surface scale on the subsequent processing of strip steel, domestic and foreign production enterprises generally use chemical wet descaling, which has a good cleaning effect. In order to obtain an ideal cleaning effect, hydrochloric acid with a high temperature of 85°C is often used to remove the oxide scale on the surface of carbon steel, silicon steel, high-strength st...

Claims

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Application Information

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IPC IPC(8): B21B45/06B21B45/08F26B21/00
CPCB21B45/06B21B45/08F26B21/00
Inventor 王耀吴迪青黎浩周云根梁芳廖砚林
Owner WISDRI ENG & RES INC LTD
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