WO2020232936A1 - 带钢高效除鳞装置及方法 - Google Patents

带钢高效除鳞装置及方法 Download PDF

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WO2020232936A1
WO2020232936A1 PCT/CN2019/107505 CN2019107505W WO2020232936A1 WO 2020232936 A1 WO2020232936 A1 WO 2020232936A1 CN 2019107505 W CN2019107505 W CN 2019107505W WO 2020232936 A1 WO2020232936 A1 WO 2020232936A1
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tank
pickling tank
pickling
strip steel
descaling device
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PCT/CN2019/107505
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English (en)
French (fr)
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王耀
廖砚林
吴迪青
黎浩
周云根
王朋波
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中冶南方工程技术有限公司
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Publication of WO2020232936A1 publication Critical patent/WO2020232936A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/06—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects

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  • the invention relates to the technical field of strip steel surface cleaning, and more specifically to a strip steel high-efficiency descaling device and method.
  • the surface quality of strip steel is one of the key factors that affect product performance. During the hot rolling of the strip steel, a dense metal oxide film, commonly known as scale, will form on the surface, which will seriously reduce the surface quality of the strip and increase the wear of the roll.
  • the technical problem to be solved by the present invention is to provide a strip steel high-efficiency descaling device and method, which is mainly aimed at hydrochloric acid-based pickling units, slowing down the environmental pollution of high-temperature and high-concentration hydrochloric acid, accelerating the cleaning speed, reducing acid consumption, and obtaining high Surface quality strip steel.
  • the technical solution adopted by the present invention to solve its technical problems is to construct a strip steel high-efficiency descaling device, which includes a first pickling tank, a second pickling tank, a third pickling tank, and a first spray rinse which are connected in sequence.
  • a first pickling tank, a second pickling tank, a third pickling tank, and a first spray rinse which are connected in sequence.
  • the first pickling tank, the second pickling tank, and the third pickling tank are provided with ultrasonic vibrators inside the tank bodies, and the ultrasonic vibrators are arranged above and below the strip steel, or on the side walls of the tank.
  • the ultrasonic vibrator is connected with the ultrasonic generator;
  • the descaling device also includes an online acid mist recycling system.
  • the online acid mist recycling system uses the rinsing water in the first spray rinsing tank to absorb the acid mist from the third pickling tank to form acid liquid to be added to the first pickling tank.
  • the ultrasonic vibrator is suspended in the tank bodies of the first pickling tank, the second pickling tank and the third pickling tank through the bracket.
  • the bracket is also connected with a screw coupling, and the position of the bracket is adjusted by the screw coupling.
  • the ultrasonic vibrator is made of stainless steel, titanium alloy or ceramic, and the surface of the ultrasonic vibrator is coated with polytetrafluoroethylene or tantalum.
  • the first pickling tank, the second pickling tank and the third pickling tank are all provided with level gauges, and the ultrasonic generator is connected to the level gauge.
  • the invention also provides a method for strip steel descaling, which includes the following steps:
  • step S2 The strip steel after the pickling in step S1 enters the first spray rinsing tank and the second spray rinsing tank in sequence, and the rinsing temperature is 40-80°C;
  • step S3 Part of the rinsing water in step S2 flows back through the atomization spray device to collect the acid mist generated by the third pickling tank, and the absorption liquid is supplied to the first pickling tank;
  • step S4 The strip steel rinsed in step S2 is blown dry by a radiant hot air drying system.
  • Ultrasonic waves will produce instantaneous strong shock waves and micro jets near the surface of the strip, which will peel off the oxide scale on the strip. At the same time, ultrasound will strengthen the replacement of acid on the surface of the strip, creating extreme physical and chemical conditions, strengthening the pickling effect and reducing acid consumption.
  • the invention strengthens the pickling effect and relieves the pickling pressure through ultrasonic pickling, is suitable for the industrial continuous cleaning of strip steels of different thicknesses and operating speeds, significantly improves the cleaning efficiency and reduces the environmental protection pressure;
  • the present invention can recover the last-stage high-concentration acid mist online, form fresh acid liquid and add it to the first pickling tank, improve the pickling efficiency, reduce the acid mist treatment capacity of the acid mist recovery system, and relieve environmental pressure;
  • the present invention also uses rapid radiation drying to add double insurance to hot air drying.
  • Fig. 1 is a schematic diagram of an efficient descaling device for strip steel of the present invention.
  • the strip steel high-efficiency descaling device of the present invention includes a first pickling tank 1, a second pickling tank 2, a third pickling tank 3, a first spray rinsing tank 4, and a second spray Rinse tank 5, radiant hot air drying system 6, as well as auxiliary equipment circulation tank and acid-resistant pump.
  • the radiant hot air drying system 6 is equipped with infrared or microwave rapid radiation drying equipment.
  • the first pickling tank 1, the second pickling tank 2 and the third pickling tank 3 are provided with ultrasonic vibrators 9 inside the tank bodies, and the ultrasonic vibrators 9 are arranged above and below the strip steel 8, or on the side walls of the tank body,
  • the ultrasonic vibrator 9 is connected to the ultrasonic generator.
  • the ultrasonic vibrator 9 is suspended in the tank bodies of the first pickling tank 1, the second pickling tank 2 and the third pickling tank 3 through a bracket.
  • the bracket is also connected with a screw coupling, and the position of the bracket is adjusted by the screw coupling, and the distance between the ultrasonic vibrator 9 and the strip steel 8 or the groove wall can be adjusted.
  • the ultrasonic vibrator 9 is made of stainless steel, titanium alloy or ceramic.
  • the surface of the ultrasonic vibrator 9 is coated with polytetrafluoroethylene or tantalum, which has good corrosion resistance.
  • the first pickling tank 1, the second pickling tank 2 and the third pickling tank 3 are equipped with level gauges, and the ultrasonic generator is connected with the level gauge to realize the low-level interlocking protection and prevent the ultrasonic generator from drying out. .
  • the descaling device also includes an online acid mist recycling system 7.
  • the online acid mist recycling system 7 uses the rinsing water in the first spray rinsing tank 4 to absorb the acid mist in the third pickling tank 3 to form an acid liquid that is added to the first Pickling tank 1.
  • the present invention also provides an efficient descale method for strip steel. Three method embodiments are listed below:
  • the incoming steel grade oxide contains 2.3% silicon, and the thickness of the oxide scale is 18um. It is divided into three layers and the innermost layer is Iron silicon oxide, turn on 12 sets of ultrasonic generators, the ultrasonic waves will generate instantaneous strong shock waves and micro-jets near the surface of the strip, which will peel off the oxide scale on the strip. At the same time, ultrasound will strengthen the replacement of acid on the surface of the strip, creating extreme physical and chemical conditions, strengthening the pickling effect, and reducing acid consumption;
  • the clean strip is dried by a hot air system equipped with near-infrared rapid radiation drying.
  • the incoming steel grade oxide scale contains 2.3% silicon and 2% manganese, and the thickness of the oxide scale is 16um, which is divided into three layers.
  • the thickness of the outer layer of Fe 3 O 4 is 8.65um
  • the thickness of the middle layer of FeO is 5.57um
  • the innermost layer is iron silicon oxide.
  • the clean strip is dried by a hot air system equipped with near-infrared rapid radiation drying.
  • the thickness of the ordinary carbon steel in the scale of the incoming steel grade is 21um, which is divided into a typical three-layer scale structure.
  • the ultrasonic waves will generate instantaneous strong shock waves and micro jets near the surface of the strip steel, which will peel off the oxide skin on the strip.
  • ultrasonic waves will strengthen the replacement of acid on the surface of the strip, creating extreme physical and chemical conditions, strengthening the pickling effect and reducing acid consumption;
  • the clean strip is dried by a hot air system equipped with near-infrared rapid radiation drying.
  • the cleaning process of the present invention the cleaning process of carbon steel is completed, and the surface cleanliness is good.
  • the comparison result with conventional pickling is shown in Table 2.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

一种带钢高效除鳞装置及方法，其装置包括依次连接的第一酸洗槽（1）、第二酸洗槽（2）、第三酸洗槽（3）、第一喷淋漂洗槽（4）、第二喷淋漂洗槽（5）和辐射热风干燥系统（6）；所述第一酸洗槽（1）、第二酸洗槽（2）和第三酸洗槽（3）的槽体内部设有超声波振子（9），所述超声波振子（9）布置在带钢（8）的上下方，或者布置在槽体侧壁，所述超声波振子（9）与超声波发生器连接；除鳞装置还包括在线酸雾回用系统（7），在线酸雾回用系统（7）利用第一喷淋漂洗槽（4）的漂洗水吸收第三酸洗槽（3）的酸雾，形成酸液补加至第一酸洗槽（1）。该除鳞装置及方法主要针对盐酸基酸洗机组，减缓高温高浓度盐酸对环境的污染、加快清洗速度、降低酸耗，进而获得高表面质量的带钢。

Description

带钢高效除鳞装置及方法 技术领域
本发明涉及带钢表面清洗技术领域，更具体地说，涉及一种带钢高效除鳞装置及方法。
背景技术
带钢的表面质量是影响产品性能提升的关键因素之一。带钢在热轧过程中会在表面形成一层致密的金属氧化物薄膜，俗称鳞皮，该鳞皮会严重降低带钢表面质量且加剧轧辊的磨损。
针对上述表面鳞皮对带钢后续加工的影响，国内外生产企业普遍采用化学湿法除鳞，该方法清洗效果好。为了获得理想的清洗效果，常采用高温达85℃的盐酸酸洗除去碳钢、硅钢、高强钢等钢种表面的氧化铁皮，而且酸洗时间较长约30s，高温高浓度的盐酸对设备腐蚀严重，导致槽体结构复杂，酸雾挥发对环境影响较大。同时清洗时间很长，槽体通常达数百米。因此，亟待开发高效酸洗设备及工艺，减缓高温高浓度盐酸对环境的污染、加快清洗速度以及获得高表面质量的带钢。目前，常规酸洗机组及工艺的酸洗效率还有待通过辅助其他工艺进一步提高；酸洗槽内不同浓度的酸雾一并经由酸雾回收系统处理，处理压力大，效果差，环保压力大，盐酸的回收利用率低；再者，实际生产过程中经常出现因为热风干燥换热效率不够或过热蒸汽温度不达标导致带钢干燥不充分的现象。
发明内容
本发明要解决的技术问题在于，提供一种带钢高效除鳞装置及方法，主要针对盐酸基酸洗机组，减缓高温高浓度盐酸对环境的污染、加快清洗速度、降低酸耗，进而获得高表面质量的带钢。
本发明解决其技术问题所采用的技术方案是：构造一种带钢高效除鳞装置，包括依次连接的第一酸洗槽、第二酸洗槽、第三酸洗槽、第一喷淋漂洗槽、第二喷淋漂洗槽和辐射热风干燥系统；
所述第一酸洗槽、第二酸洗槽和第三酸洗槽的槽体内部设有超声波振子，所述超声波 振子布置在带钢的上下方，或者布置在槽体侧壁，所述超声波振子与超声波发生器连接；
除鳞装置还包括在线酸雾回用系统，在线酸雾回用系统利用第一喷淋漂洗槽的漂洗水吸收第三酸洗槽的酸雾，形成酸液补加至第一酸洗槽。
上述方案中，所述超声波振子通过支架悬挂在第一酸洗槽、第二酸洗槽和第三酸洗槽的槽体内。
上述方案中，所述支架还与螺杆联轴器连接，通过螺杆联轴器调节支架的位置。
上述方案中，所述超声波振子材质为不锈钢、钛合金或陶瓷，超声波振子表面涂覆聚四氟乙烯或镀钽。
上述方案中，所述第一酸洗槽、第二酸洗槽和第三酸洗槽内都设有液位计，所述超声波发生器与所述液位计连接。
本发明还提供了一种带钢除鳞方法，包括以下步骤：
S1、在第一酸洗槽、第二酸洗槽和第三酸洗槽内注入盐酸，盐酸溶液的浓度为2-14％，温度为60-85℃；开启超声波发生器，带钢依次通过第一酸洗槽、第二酸洗槽和第三酸洗槽酸洗；
S2、经过步骤S1酸洗的带钢依次进入第一喷淋漂洗槽和第二喷淋漂洗槽，漂洗温度为40-80℃；
S3、步骤S2中的漂洗水部分回流经雾化喷淋装置收集第三酸洗槽洗产生的酸雾，吸收液补给到第一酸洗槽；
S4、步骤S2中漂洗后的带钢经由辐射热风干燥系统吹干。
上述方案中，。
上述方案中，。
实施本发明的带钢高效除鳞装置及方法，具有以下有益效果：
1、超声波会在带钢表面附近产生瞬时的强烈的冲击波和微射流，使带钢上的氧化皮剥落。同时，超声波会强化带钢表面酸液的置换，创造了极端的物理化学条件，强化酸洗效果，减少酸耗。本发明通过超声酸洗，强化酸洗效果，缓解酸洗压力，适用于不同厚度、运行速度带钢的工业化连续清洗，显著提高清洗效率、降低环保压力；
2、本发明可以在线回收最后一级高浓度酸雾，形成新鲜酸液补加至第一酸洗槽，提高酸洗效率，降低酸雾回收系统的酸雾处理量，缓解环境压力；
3、本发明同时利用快速辐射干燥为热风干燥增加了双重保险。
附图说明
下面将结合附图及实施例对本发明作进一步说明，附图中：
图1是本发明带钢高效除鳞装置的示意图。
具体实施方式
为了对本发明的技术特征、目的和效果有更加清楚的理解，现对照附图详细说明本发明的具体实施方式。
如图1所示，本发明带钢高效除鳞装置包括依次连接的第一酸洗槽1、第二酸洗槽2、第三酸洗槽3、第一喷淋漂洗槽4、第二喷淋漂洗槽5、辐射热风干燥系统6，以及辅助设备循环罐和耐酸泵。辐射热风干燥系统6配备了红外或微波快速辐射干燥设备。
第一酸洗槽1、第二酸洗槽2和第三酸洗槽3的槽体内部设有超声波振子9，超声波振子9布置在带钢8的上下方，或者布置在槽体侧壁，超声波振子9与超声波发生器连接。超声波振子9通过支架悬挂在第一酸洗槽1、第二酸洗槽2和第三酸洗槽3的槽体内。支架还与螺杆联轴器连接，通过螺杆联轴器调节支架的位置，超声波振子9距离带钢8或槽壁的间距可调节。
超声波振子9材质为不锈钢、钛合金或陶瓷，超声波振子9表面涂覆聚四氟乙烯或镀钽，具有良好的防腐蚀性能。
第一酸洗槽1、第二酸洗槽2和第三酸洗槽3内都设有液位计，超声波发生器与液位计连接，实现低液位连锁保护，防止超声波发生器干烧。
除鳞装置还包括在线酸雾回用系统7，在线酸雾回用系统7利用第一喷淋漂洗槽4的漂洗水吸收第三酸洗槽3的酸雾，形成酸液补加至第一酸洗槽1。
本发明还提供了带钢高效除鳞方法，以下列出三个方法实施例：
实施例1
1)开启泵、循环罐阀门，在三个酸洗槽内充满液体，本实施例中来料钢种氧化皮含有2.3％硅，氧化铁皮厚度为18um，分为三层结构，最内层为铁硅氧化物，开启12组超声波发生器，超声波会在带钢表面附近产生瞬时的强烈的冲击波和微射流，使带钢上的氧化 皮剥落。同时，超声波会强化带钢表面酸液的置换，创造了极端的物理化学条件，强化酸洗效果，减少酸耗；
2)三个酸洗槽内盐酸浓度分别稳定在4％，8％和12％，酸液温度为60℃，漂洗温度为40℃清洗带钢，工艺实施参数如表1所示；
3)漂洗水部分回流经过雾化喷淋装置收集第三酸洗槽产生的高浓度酸雾，吸收液补给到第一酸洗槽，用于提高第一酸洗槽内的酸浓度，在线回收酸雾用于酸洗降低了新酸酸耗，降低了环境压力；
4)漂洗后清洁带钢经由配备有兼有近红外快速辐射干燥的热风系统吹干。
实施例2
1)开启泵、循环罐阀门，在三个声酸洗槽内充满液体，本实施例来料钢种氧化皮含有2.3％硅、2％锰，氧化铁皮厚度为16um，分为三层结构，外层Fe 3O 4厚度为8.65um，中间层FeO厚度为5.57um，最内层为铁硅氧化物，开启9组超声发生器，超声波会在带钢表面附近产生瞬时的强烈的冲击波和微射流，使带钢上的氧化皮剥落。同时，超声波会强化带钢表面酸液的置换，创造了极端的物理化学条件，强化酸洗效果，减少酸耗；
2)三个酸洗槽内盐酸浓度分别稳定在6％，10％和11％，酸液温度为80℃，漂洗温度为80℃清洗带钢，工艺实施参数如表1所示；
3)漂洗水部分回流经过雾化喷淋装置收集第三酸洗槽产生的高浓度酸雾，吸收液补给到第一酸洗槽，用于提高第一酸洗槽内的酸浓度，在线回收酸雾用于酸洗降低了新酸酸耗，降低了环境压力；
4)漂洗后清洁带钢经由配备有兼有近红外快速辐射干燥的热风系统吹干。
实施例3
1)开启泵、循环罐阀门，在三个酸洗槽内充满液体，本实施例中来料钢种氧化皮中普碳钢的氧化铁皮厚度为21um，分为典型的三层氧化铁皮结构，开启8组超声波发射器，超声波会在带钢表面附近产生瞬时的强烈的冲击波和微射流，使带钢上的氧化皮剥落。同时，超声波会强化带钢表面酸液的置换，创造了极端的物理化学条件，强化酸洗效果，减少酸耗；
2)三个酸洗槽内盐酸浓度分别稳定在2％，6％和14％，酸液温度为85℃，漂洗温度为60℃清洗带钢，工艺实施参数如表1所示；
3)漂洗水部分回流经过雾化喷淋装置收集第三酸洗槽产生的高浓度酸雾，吸收液补给到第一酸洗槽，用于提高第一酸洗槽酸浓度，在线回收酸雾用于酸洗降低了新酸酸耗，降低了环境压力；
4)漂洗后清洁带钢经由配备有兼有近红外快速辐射干燥的热风系统吹干。
表1各实施例实施参数
Figure PCTCN2019107505-appb-000001
按照本发明的清洗工艺流程，完成碳钢的清洗过程，表面清洁度良好，和常规酸洗对比结果如表2所示。
表2本发明和常规酸洗方法及效果对比
酸洗耗时(s) 酸耗 清洗效果 环保压力
常规工艺 25-30 - 金属光泽 酸雾量大
该工艺 15-22 减少5-10% 金属光泽 酸雾量小
上面结合附图对本发明的实施例进行了描述，但是本发明并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本发明的启示下，在不脱离本发明宗旨和权利要求所保护的范围情况下，还可做出很多形式，这些均属于本发明的保护之内。

Claims (6)

  1. 一种带钢高效除鳞装置，其特征在于，包括依次连接的第一酸洗槽、第二酸洗槽、第三酸洗槽、第一喷淋漂洗槽、第二喷淋漂洗槽和辐射热风干燥系统；
    所述第一酸洗槽、第二酸洗槽和第三酸洗槽的槽体内部设有超声波振子，所述超声波振子布置在带钢的上下方，或者布置在槽体侧壁，所述超声波振子与超声波发生器连接；
    除鳞装置还包括在线酸雾回用系统，在线酸雾回用系统利用第一喷淋漂洗槽的漂洗水吸收第三酸洗槽的酸雾，形成酸液补加至第一酸洗槽。
  2. 根据权利要求1所述的带钢高效除鳞装置，其特征在于，所述超声波振子通过支架悬挂在第一酸洗槽、第二酸洗槽和第三酸洗槽的槽体内。
  3. 根据权利要求2所述的带钢高效除鳞装置，其特征在于，所述支架还与螺杆联轴器连接，通过螺杆联轴器调节支架的位置。
  4. 根据权利要求1所述的带钢高效除鳞装置，其特征在于，所述超声波振子材质为不锈钢、钛合金或陶瓷，超声波振子表面涂覆聚四氟乙烯或镀钽。
  5. 根据权利要求1所述的带钢高效除鳞装置，其特征在于，所述第一酸洗槽、第二酸洗槽和第三酸洗槽内都设有液位计，所述超声波发生器与所述液位计连接。
  6. 一种利用权利要求1所述的带钢高效除鳞装置的带钢除鳞方法，其特征在于，包括以下步骤：
    S1、在第一酸洗槽、第二酸洗槽和第三酸洗槽内注入盐酸，盐酸溶液的浓度为2-14％，温度为60-85℃；开启超声波发生器，带钢依次通过第一酸洗槽、第二酸洗槽和第三酸洗槽酸洗；
    S2、经过步骤S1酸洗的带钢依次进入第一喷淋漂洗槽和第二喷淋漂洗槽，漂洗温度为40-80℃；
    S3、步骤S2中的漂洗水部分回流经雾化喷淋装置收集第三酸洗槽洗产生的酸雾，吸收液补给到第一酸洗槽；
    S4、步骤S2中漂洗后的带钢经由辐射热风干燥系统吹干。
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