CN102206831A - High-temperature gas heating method and device for pickling hot rolled steel strip - Google Patents
High-temperature gas heating method and device for pickling hot rolled steel strip Download PDFInfo
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- CN102206831A CN102206831A CN2011101445564A CN201110144556A CN102206831A CN 102206831 A CN102206831 A CN 102206831A CN 2011101445564 A CN2011101445564 A CN 2011101445564A CN 201110144556 A CN201110144556 A CN 201110144556A CN 102206831 A CN102206831 A CN 102206831A
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- steel band
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- steel strip
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- heating
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Abstract
The invention discloses a high-temperature gas heating method and device for pickling a hot rolled steel strip. The method comprises the following steps of: firstly, heating high-temperature gas: heating the passing steel strip to 85-500 DEG C through high-temperature gas in a box; then, leading the heated steel strip to enter a pickling tank; heating acid liquid to 60-98 DEG C through the steel strip; and reacting the steel strip with acid to remove the oxide of ferrum on the surface. In the method disclosed by the invention, the surface temperature of the steel strip is increased to above the normal pickling temperature through use of the high-temperature gas; then, the high-temperature steel strip enters the pickling tank; the pickling solution is heated by the accumulated heat of the steel strip, the rapid pickling is realized, the aim of rapid dissolution of the oxide is achieved, and the steel strip without oxide on the surface is obtained. The traditional method for increasing the temperature of the steel strip and the acid liquid is changed; and the steel strip is not in direct contact with the acid liquid during heating in the method, the heating speed is high, and the blockage condition caused by the deposition and gumflower of colloid and oxide film suspensions in a heater is basically prevented.
Description
Technical field
The present invention relates to the pickling technology of steel band, relate in particular to the heating means and the device thereof of hot rolled strip pickling.
Background technology
The method of continuous pickling is generally adopted in existing steel band pickling, and promptly by several pickling tanks, the pickling acid concentration and the flow direction of pickling tank are opposite with the steel band traffic direction continuously for the hot-rolled steel band.In the steel band pickling,, need heat steel band and acid solution in order to improve pickling speed.Common method is at present, and acid is by external steam indirect heating elevated temperature, and steam and acid solution are separated in two non-touching passages of well heater, relies on the conduction heating acid solution.The temperature of steel band is to raise by the acid solution heating, under the acid of high-temperature, accelerates the steel band pickling speed, improves the quality and output.This dependence steam heating acid solution, the shortcoming of the heating means of acid solution reheat steel band is: 1) in most cases, steel band is first pickling tank with the room temperature ingress, steel band is heated to the temperature of hope therein from room temperature then, therefore a big function of first pickling tank is to improve temperature of steel strips as well heater, temperature of steel strips is lower in this groove comparatively speaking, and pickling speed is slower.2) in containing the steel band acid cleaning process of alloy, formed during owing to high temperature in course of hot rolling and contained the oxide compound that has element.These oxide compounds and acid do not react or reacts very slow, and they exist with colloid in acid solution or membrane-like exists, and is floating or be dispersed in the acid solution.Colloid and oxide film suspensoid flow in the acid tube road or during through heater heats, can wall attached to acid tube road or well heater on, influence the use of acid tube road and well heater, seriously will cause continuous pickling line not move.3) non-ferriferous oxide in the steel (for example: silicon-dioxide) exist with colloid in acid solution or membrane-like exists, because the temperature height of heater surfaces, cause the colloidal sol of colloidal to be converted into gel and membrane-like thing, at well heater acid solution surface deposition, passing in time, settling is more and more thicker, causes the functions of the equipments forfeiture.
In order to overcome colloid and oxide film suspensoid in the acid tube road or the obstruction that causes of the deposition in the well heater, glue flower, the patent No. is the method that the invention of CN200810033928.4 proposes to be provided with at pickling line the steam heating groove, overcomes above problem.The invention of CN200810033928.4 is the outer heating means that adopt steam, and relying on conducts heat improves the temperature of steel band from outside to inside.Because vapor temperature generally speaking is not high, the speed of steam heating steel is slow in addition, needs the long time so steel conducts heat, and makes pickling speed slack-off.Simultaneously, steam heating groove (hot water circulation) has occupied very large space, can not arbitrarily be provided with, and can not solve and keep the temperature that needs in the pickling tank of whole pickling line.
Summary of the invention
Problem to be solved by this invention provides the high-temperature gas heating means of hot rolled strip pickling.This heating means have changed the method for existing raising steel band and acid liquor temperature, directly do not contact during the heating of this method with acid solution, rate of heating is fast, avoided the appearance of deposition in well heater of colloid and oxide film suspensoid, stopping state that the glue flower causes basically.The present invention also provides the device of high-temperature gas heating simultaneously.
The high-temperature gas heating means of hot rolled strip pickling of the present invention, at first high-temperature gas heating, promptly the steel band to process heats by high-temperature gas in casing, is heated to 85～500 ℃; Then, the steel band that heated enters pickling tank, and steel band is heated to 60 ℃～98 ℃ to acid solution, and steel band and acid react, and removes the oxide compound of the iron on surface.
The high-temperature gas heating unit that uses in present method, it is arranged on the inlet of pickling line, the outside that is pickling tank is near the pickling tank position, it comprises casing, is arranged on intravital pinch roll of case and supporting roll, the outlet that the bottom of casing links to each other with intake ducting, its top is provided with waste gas, pinch roll contact with the upper and lower surface of steel band at the two ends, the left and right sides of casing, supporting roll contacts with the lower surface of steel band in the centre of casing.
Method of the present invention relies on high-temperature gas that the steel strip surface temperature is brought up to more than the normal pickling temperature, high-temperature steel belt enters pickling tank then, relies on the accumulation of heat heating Acidwash solution of steel band, realizes quick pickling, reach the rapidly-soluble purpose of oxide compound, obtain surperficial oxide-free steel band.The advantage of this kind method is: 1) steel strip surface is heated to 85～500 ℃, it enters behind the pickling tank in the heating Acidwash solution, can under low free acid content condition, carry out quick pickling, put forward highly acid utilising efficiency, reduce the regeneration quantity of spent acid, improve equipment efficiency of usage and hourly output.2) when steel band enters pickling tank temperature of steel strips height, acid liquor temperature high in, because there are not the parts of intermediate thermal conductivity in hot spots, avoided in the acid solution existing or the deterioration of the performance of membrane-like existence confrontation heating installation, especially avoided causing the inefficacy of functions of the equipments with colloid.
Description of drawings
Fig. 1 is the structural representation one of high-temperature gas heating unit of the present invention.
Fig. 2 is the structural representation two of high-temperature gas heating unit of the present invention.
Embodiment
The high-temperature gas heating means of hot rolled strip pickling of the present invention, at first high-temperature gas heating, promptly the steel band to process heats by high-temperature gas in casing, is heated to 85～500 ℃; Then, the steel band that heated enters pickling tank, and steel band is heated to 60 ℃～98 ℃ to acid solution, and steel band and acid react, and removes the oxide compound of the iron on surface.
Wherein, the Heating temperature of steel strip surface is preferably 150～350 ℃, and actual temp is regulated according to steel band speed, width, thickness, and the temperature maintenance that preferably makes first pickling tank is about 85 ℃.
From Fig. 1, Fig. 2 as can be known, the high-temperature gas heating unit that uses among the present invention, it is arranged on the inlet of pickling line, the outside that is pickling tank is near the pickling tank position, and it comprises casing 1, is arranged on pinch roll 2 and supporting roll 3 in the casing 1, the outlet that the bottom of casing 1 links to each other with intake ducting 4, its top is provided with waste gas, pinch roll 2 is at the two ends, the left and right sides of casing 1, contact with the upper and lower surface of steel band 9, supporting roll 3 contacts with the lower surface of steel band 9 in the centre of casing 1.
When the gas that enters had been hot gas, as shown in Figure 1, high-temperature gas directly entered casing 1 by intake ducting 4, was full of the whole space in the casing 1, realized the heating to steel band 9.The hot gas here can be the waste gas of other thermal source, as the utilization again of the used heat of process furnace flue; Also can be that the back of in isolated plant gas being burnt is controlled at steady temperature to high-temperature gas by mixing air, enter 1 pair of steel band 9 of casing by pipeline 4 then and heat up.
When the gas that enters was combustion gas, as shown in Figure 2, the bottom of intake ducting 4 connected blower fan 6, valve 7.Combustion gas puts in the casing 1 by a plurality of inlets of many pipelines 4 from casing 1 bottom, and burner 5 up and down all is installed on each pipeline 4, and burner 5 is arranged on the upper and lower surface of steel band 9 up and down.This kind mode connects the thermal-flame of the gas after the burning by burner 4 and is ejected into steel band 9 surfaces, has further improved the speed of heating, has guaranteed the quality of heating.Wherein, burner 5 can be plate wide slot type burner, also can be that quantity changes according to width of steel band according to the combination of the single burner of width of steel band direction layout.In order to control the steel strip surface temperature, the angle between flame ejection place of burner 5 and the steel band 9 is 5～90 °.The gas here also can be the mixture of combustion gas and other gas etc.
In order to make full use of the heat of steel band, be preferably in and be provided with one section airtight device 8 between the right side outlet of casing 1 and the pickling tank and be incubated, to guarantee that steel band enters pickling tank with higher temperature.
Method of the present invention relies on high-temperature gas that the steel strip surface temperature is brought up to more than the normal pickling temperature, high-temperature steel belt enters pickling tank then, relies on the accumulation of heat heating Acidwash solution of steel band, realizes quick pickling, reach the rapidly-soluble purpose of oxide compound, obtain surperficial oxide-free steel band.The advantage of this kind method is: 1) steel strip surface is heated to 95～500 ℃, it enters behind the pickling tank in the heating Acidwash solution, can under low free acid content condition, carry out quick pickling, put forward highly acid utilising efficiency, reduce the regeneration quantity of spent acid, improve equipment efficiency of usage and hourly output.2) when steel band enters pickling tank temperature of steel strips height, acid liquor temperature high in, because there are not the parts of intermediate thermal conductivity in hot spots, avoided in the acid solution existing or the deterioration of the performance of membrane-like existence confrontation heating installation, especially avoided causing the inefficacy of functions of the equipments with colloid.
Claims (9)
1. the high-temperature gas heating means of hot rolled strip pickling, at first high-temperature gas heating, promptly the steel band to process heats by high-temperature gas in casing, is heated to 85～500 ℃; Then, the steel band that heated enters pickling tank, and steel band is heated to 60 ℃～98 ℃ to acid solution, and steel band and acid react, and removes the oxide compound of the iron on surface.
2. heating means according to claim 1 is characterized in that: the Heating temperature of steel band is 150～350 ℃, and the temperature of first pickling tank is 85 ℃.
3. high-temperature gas heating unit that is used for the described method of claim 1, it is characterized in that: this device is arranged on the inlet of pickling line, the outside that is pickling tank is near the pickling tank position, it comprises casing (1), be arranged on pinch roll (2) and supporting roll (3) in the casing (1), the bottom of casing (1) links to each other with intake ducting (4), its top is provided with the outlet of waste gas, pinch roll (2) is at the two ends, the left and right sides of casing (1), contact with the upper and lower surface of steel band (9), supporting roll (3) contacts with the lower surface of steel band (9) in the centre of casing (1).
4. heating unit according to claim 3 is characterized in that: the bottom of intake ducting (4) connects blower fan (6), valve (7).
5. heating unit according to claim 4, it is characterized in that: when pipeline (4) when having many, pipeline (4) puts in the casing (1) by a plurality of inlets of casing (1) bottom, burner (5) up and down all is installed on each pipeline (4), and burner (5) is arranged on the upper and lower surface of steel band (9) up and down.
6. heating unit according to claim 5 is characterized in that: flame ejection place and the angle between the steel band 9 of burner (5) are 5～90 °.
7. heating unit according to claim 5 is characterized in that: burner (5) can be plate wide slot type burner.
8. heating unit according to claim 5 is characterized in that: burner (5) can be that quantity changes according to width of steel band according to the combination of the single burner of width of steel band direction layout.
9. heating unit according to claim 3 is characterized in that: be provided with airtight holding-zone (8) between the right side outlet of casing (1) and the pickling tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101445564A CN102206831A (en) | 2011-05-31 | 2011-05-31 | High-temperature gas heating method and device for pickling hot rolled steel strip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101445564A CN102206831A (en) | 2011-05-31 | 2011-05-31 | High-temperature gas heating method and device for pickling hot rolled steel strip |
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| CN102206831A true CN102206831A (en) | 2011-10-05 |
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| CN2011101445564A Pending CN102206831A (en) | 2011-05-31 | 2011-05-31 | High-temperature gas heating method and device for pickling hot rolled steel strip |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280915A (en) * | 2013-07-01 | 2015-01-14 | 东芝照明技术株式会社 | Manufacturing device and manufacturing method for liquid crystal panels |
| CN107447175A (en) * | 2017-09-15 | 2017-12-08 | 江苏大力神科技股份有限公司 | A kind of zinc-plated pre-treatment section acid dip pickle |
| CN108114996A (en) * | 2017-12-01 | 2018-06-05 | 中南大学 | A kind of continuous deep cooling box of deep cooling rolled strip and the deep cooling rolling system using the case |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS511307A (en) * | 1974-03-04 | 1976-01-08 | Nisshin Steel Co Ltd | Kinzokusutoritsupu no shodonsansenkotei ni okeru hainetsuryohoho oyobi sochi |
| CN86104502A (en) * | 1985-07-10 | 1987-02-25 | 日本钢管株式会社 | Band steel continuous treatment production line with fired heater |
| CN201136886Y (en) * | 2007-10-25 | 2008-10-22 | 中冶南方(武汉)威仕工业炉有限公司 | Nonoxidizing heating segment of band steel bright annealing furnace |
| CN101519784A (en) * | 2008-02-26 | 2009-09-02 | 宝山钢铁股份有限公司 | Heating method of silicon-steel pickling line and device thereof |
| CN101892447A (en) * | 2010-08-20 | 2010-11-24 | 成都虹波实业股份有限公司 | Device and technology for continuously cleaning surface of molybdenum wire under high temperature |
-
2011
- 2011-05-31 CN CN2011101445564A patent/CN102206831A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS511307A (en) * | 1974-03-04 | 1976-01-08 | Nisshin Steel Co Ltd | Kinzokusutoritsupu no shodonsansenkotei ni okeru hainetsuryohoho oyobi sochi |
| CN86104502A (en) * | 1985-07-10 | 1987-02-25 | 日本钢管株式会社 | Band steel continuous treatment production line with fired heater |
| CN201136886Y (en) * | 2007-10-25 | 2008-10-22 | 中冶南方(武汉)威仕工业炉有限公司 | Nonoxidizing heating segment of band steel bright annealing furnace |
| CN101519784A (en) * | 2008-02-26 | 2009-09-02 | 宝山钢铁股份有限公司 | Heating method of silicon-steel pickling line and device thereof |
| CN101892447A (en) * | 2010-08-20 | 2010-11-24 | 成都虹波实业股份有限公司 | Device and technology for continuously cleaning surface of molybdenum wire under high temperature |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280915A (en) * | 2013-07-01 | 2015-01-14 | 东芝照明技术株式会社 | Manufacturing device and manufacturing method for liquid crystal panels |
| CN107447175A (en) * | 2017-09-15 | 2017-12-08 | 江苏大力神科技股份有限公司 | A kind of zinc-plated pre-treatment section acid dip pickle |
| CN108114996A (en) * | 2017-12-01 | 2018-06-05 | 中南大学 | A kind of continuous deep cooling box of deep cooling rolled strip and the deep cooling rolling system using the case |
| CN108114996B (en) * | 2017-12-01 | 2019-07-30 | 中南大学 | A kind of continuous deep cooling box of deep cooling rolled strip and the deep cooling rolling system using the case |
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Application publication date: 20111005 |