CN102220594A - Method for pickling hot rolled steel strip by resistance heating and its apparatus - Google Patents
Method for pickling hot rolled steel strip by resistance heating and its apparatus Download PDFInfo
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- CN102220594A CN102220594A CN 201110144511 CN201110144511A CN102220594A CN 102220594 A CN102220594 A CN 102220594A CN 201110144511 CN201110144511 CN 201110144511 CN 201110144511 A CN201110144511 A CN 201110144511A CN 102220594 A CN102220594 A CN 102220594A
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Abstract
The invention discloses a method for pickling a hot rolled steel strip by resistance heating and its apparatus. The invention comprises the following steps: a resistance heating is performed at first, wherein a resistor is heated by connecting with a power for heating a steel strip to 70 to 300 DEG C; then, the heated steel strip is sent into an acid-bath tank, an acid solution is heated by the steel strip to a temperature range of 60 DEG C to 98 DEG C, the steel strip is reacted with acid for removing the oxide of iron on surface. The resistance heating is used in the invention, the steel strip is directly and rapidly heated by heating from a conductive roller and a contact resistor or a steel strip resistor of steel or an oxide, then the steel strip with a high temperature is sent into the acid-bath tank, the rapid pickling can be realized according to an accumulation heating pickling solution of the steel strip, and the purpose that the oxide is rapidly dissolved can be achieved, and a steel strip without oxide on surface can be obtained. The heating method provided in the invention changes the present method of raising the temperature of steel strip and the acid solution, the method avoids a direct contact with the acid solution which has a fast heating speed, the problems of deposition caused by a suspension of colloid and oxide in a heater as well as obstruction condition caused by rubber lugs can be basically avoided.
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 resistive heating method 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 resistive heating simultaneously.
The resistive heating method of hot rolled strip pickling of the present invention, at first resistive heating even resistance generates heat after connecting power supply, is heated to 70～300 ℃ to steel band; 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 resistive heating device 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 installed in the intravital conductive rollers of case, conductive rollers is at least two covers, two rollers up and down of every cover roller all contact with the upper and lower surface of steel band, and conductive rollers links to each other with low-voltage power supply by electric loop.
The present invention adopts the resistance method and internal heating, the direct rapid heating of steel band is carried out in the contact resistance of dependence conductive rollers and steel or oxide compound or the heating of steel band resistance, high-temperature steel belt enters pickling tank then, rely on the accumulation of heat heating Acidwash solution of steel band, realize 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 70～300 ℃, it enters behind the pickling tank in the heating Acidwash solution, can under low free acid content condition, carry out fast 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 hot spots does not contact with acid solution, avoided in the acid solution existing with colloid or the deterioration of the performance of membrane-like existence confrontation equipment, the functions of the equipments of especially avoiding causing lost efficacy.
Description of drawings
Fig. 1 is the structural representation one of resistive heating device of the present invention.
Fig. 2 is the structural representation two of resistive heating device of the present invention.
Fig. 3 is the structural representation three of resistive heating device of the present invention.
Embodiment
The resistive heating method of hot rolled strip pickling of the present invention, at first resistive heating even resistance generates heat after connecting power supply, is heated to 70～300 ℃ to steel band; 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 70～150 ℃, and concrete Heating temperature is regulated according to steel band speed, width, thickness.
The resistive heating device 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 1, is installed in the conductive rollers 2 in the casing 1, conductive rollers 2 is at least two covers, two rollers up and down of every cover roller all contact with the upper and lower surface of steel band 6, and conductive rollers 2 links to each other with low-voltage power supply 4 by electric loop 3.
Wherein, conductive rollers 2 has following several with low-voltage power supply 4 mode of connection:
Mode one is as shown in Figure 1: the top roll in every cover roller all is connected with the same utmost point of power supply, lower roll all is connected with another utmost point of power supply, another utmost point by another root conductive rollers → power supply in a conductive rollers → oxide compound → steel → oxide compound → cover roller in a utmost point → cover roller of power supply forms electric loop, carries out the heating of steel band.In this state, the contact resistance heating accounts for the major portion of heating.
Mode two is as shown in Figure 2: every roller in the cover roller all is connected with a utmost point of power supply, every roller of another set of roller all is connected with another utmost point of power supply, two kinds of rollers that connect the power supply different poles are arranged at interval, another utmost point by the utmost point of power supply → cover conductive rollers → oxide compound (steel) → another set of conductive rollers → power supply forms the loop of electricity, carries out the heating of steel band.In this state, account for the major portion of heating by the resistance heating of steel.
Mode three is as shown in Figure 3: every roller in every cover roller all is connected with the same utmost point of power supply, be provided with the touch roll 5 that is supported on steel band 6 lower surfaces between every two adjacent cover rollers, the quantity of touch roll 5 equates with the tricks of conductive rollers, last root touch roll is arranged in the left end of the first cover roller or the right-hand member of last cover roller, touch roll 5 is connected with another utmost point of power supply, another utmost point by the utmost point of power supply → cover conductive rollers → oxide compound (steel) → touch roll → power supply forms the loop of electricity, carries out the heating of steel band.In this state, account for the major portion of heating by the resistance heating of steel.
Conductive rollers 2 can also be the arbitrary combination of mode one, mode two, mode three with the mode of connection of low-voltage power supply 4: the combination of mode one and mode two, the combination of mode two and mode three, the combination of mode three and mode one, the combination of mode one, mode two, mode three, purpose are to be issued to the Heating temperature that needs at the power supply type of heating of stipulating.
In this device, can equip two to eight cover conductive rollers as conductive electrode.Have pressure between the contacting of roller and steel band, unit pressure is at 0.1～0.4MPa.Roller both can be drive roll, also can be driven roll.The effect of low-voltage power supply provides resistance heating, and its waveform is not done regulation, and direct current, interchange, pulse or random waveform can.Power supply can adopt any transformation mode from electrical network 380V(or 220V, or high-voltage more) transform to below the 100V.Voltage of supply both can be the constant voltage fixed form, also can be self-adjusting continuous current or permanent power mode.It is that requirement temperature of steel strips after heating reaches 70 ~ 300 ℃ that voltage (electric current or power) is selected, and enters pickling tank, can guarantee that acid liquor temperature maintains high speed pickling state.Energising can be continuous mode, also can be interrupted mode, is purpose with control steel band and acid liquor temperature.
Claims (7)
1. the resistive heating method of hot rolled strip pickling, at first resistive heating even resistance generates heat after connecting power supply, is heated to 70～300 ℃ to steel band; 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 surface temperature of steel band is 70～150 ℃.
3. resistive heating device 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), is installed in the conductive rollers (2) in the casing (1), conductive rollers (2) is at least two covers, two rollers up and down of every cover roller all contact with the upper and lower surface of steel band (6), and conductive rollers (2) links to each other with low-voltage power supply (4) by electric loop (3).
4. heating unit according to claim 3, it is characterized in that: conductive rollers (2) with low-voltage power supply (4) mode of connection one is: the top roll in every cover roller all is connected with the same utmost point of power supply, lower roll all is connected with another utmost point of power supply, is formed the loop of electricity by another utmost point of another root conductive rollers → power supply in a conductive rollers → oxide compound → steel → oxide compound → cover roller in a utmost point → cover roller of power supply.
5. heating unit according to claim 3, it is characterized in that: conductive rollers (2) with low-voltage power supply (4) mode of connection two is: every roller in the cover roller all is connected with a utmost point of power supply, every roller of another set of roller all is connected with another utmost point of power supply, two kinds of rollers that connect the power supply different poles arrange at interval, form the loop of electricity by another utmost point of a utmost point → cover conductive rollers → oxide compound (the steel) → another set of conductive rollers → power supply of power supply.
6. heating unit according to claim 3, it is characterized in that: conductive rollers (2) with low-voltage power supply (4) mode of connection three is: every roller in every cover roller all is connected with the same utmost point of power supply, be provided with the touch roll (5) that is supported on steel band (6) lower surface between every two adjacent cover rollers, the quantity of touch roll (5) equates with the tricks of conductive rollers, last root touch roll is arranged in the left end of the first cover roller or the right-hand member of last cover roller, touch roll (5) is connected with another utmost point of power supply, forms the loop of electricity by another utmost point of the utmost point of power supply → cover conductive rollers → oxide compound (steel) → touch roll → power supply.
7. according to claim 3,4,5 or 6 described heating units, it is characterized in that: conductive rollers (2) can be the arbitrary combination of mode one, mode two, mode three with low-voltage power supply (4) mode of connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110144511 CN102220594A (en) | 2011-05-31 | 2011-05-31 | Method for pickling hot rolled steel strip by resistance heating and its apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110144511 CN102220594A (en) | 2011-05-31 | 2011-05-31 | Method for pickling hot rolled steel strip by resistance heating and its apparatus |
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| CN102220594A true CN102220594A (en) | 2011-10-19 |
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| CN 201110144511 Pending CN102220594A (en) | 2011-05-31 | 2011-05-31 | Method for pickling hot rolled steel strip by resistance heating and its apparatus |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201018673Y (en) * | 2006-12-12 | 2008-02-06 | 桂林金格电工电子材料科技有限公司 | Silver-based alloy strip conductive heating equipment |
| CN201265027Y (en) * | 2008-09-18 | 2009-07-01 | 鞍钢股份有限公司 | Direct switch-on heating annealing apparatus of hot rolled plate |
| 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 |
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2011
- 2011-05-31 CN CN 201110144511 patent/CN102220594A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201018673Y (en) * | 2006-12-12 | 2008-02-06 | 桂林金格电工电子材料科技有限公司 | Silver-based alloy strip conductive heating equipment |
| 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 |
| CN201265027Y (en) * | 2008-09-18 | 2009-07-01 | 鞍钢股份有限公司 | Direct switch-on heating annealing apparatus of hot rolled plate |
Non-Patent Citations (1)
| Title |
|---|
| 《武汉工程职业技术学院学报》 20090331 郭小龙 等 钢带的快速加热工艺研究 第21卷, 第1期 * |
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Application publication date: 20111019 |