CN114959726A - Cold-rolled strip steel acid pickling system and method - Google Patents
Cold-rolled strip steel acid pickling system and method Download PDFInfo
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- CN114959726A CN114959726A CN202210712322.3A CN202210712322A CN114959726A CN 114959726 A CN114959726 A CN 114959726A CN 202210712322 A CN202210712322 A CN 202210712322A CN 114959726 A CN114959726 A CN 114959726A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/027—Associated apparatus, e.g. for pretreating or after-treating
- C23G3/029—Associated apparatus, e.g. for pretreating or after-treating for removing the pickling fluid from the objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
- B08B3/022—Cleaning travelling work
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/36—Regeneration of waste pickling liquors
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/021—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by dipping
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The application provides a cold-rolled strip steel pickling system and a cold-rolled strip steel pickling method, wherein the system comprises: the pickling tank group is used for containing pickling solution so as to pickle strip steel and remove oxides on the surface of the strip steel; the rinsing bath group is used for containing desalted water so as to rinse the pickling solution attached to the surface of the strip steel; the at least two groups of rollers are arranged between the pickling tank group and the rinsing tank group and are used for driving the strip steel and pre-cleaning pickling solution attached to the surface of the strip steel; and the spraying device is arranged between the at least two groups of rollers and is used for spraying desalted water to the strip steel passing through the rollers so as to pre-rinse the pickling solution attached to the surface of the strip steel. The method and the device can improve the rinsing efficiency of the pickling solution attached to the surface of the strip steel, and can reduce the consumption of desalted water in the rinsing process of the strip steel.
Description
Technical Field
The application relates to the technical field of pickling processes of acid continuous rolling units, in particular to a system and a method for pickling cold-rolled strip steel.
Background
At present, the pickling process is very important for the production of cold-rolled strip steel, and the pickling can remove substances such as oxides on the surface of the hot-rolled strip steel and ensure the stable operation of subsequent cold rolling.
In the prior art, strip steel is rinsed after being subjected to pickling, residual acid of about 10-50 mL/square meter is still left on the surface of the strip steel after the strip steel is pickled and is squeezed by two groups of deviation rectifying squeezing rollers, and a large amount of desalted water is needed to rinse the strip steel in order to ensure that the content of the residual acid on the surface of the strip steel is in a range meeting rolling conditions, so that the output of waste rinsing liquid is large, the gas consumption is too high, and the continuous and stable operation of an acid continuous rolling unit and an acid regeneration device is influenced.
Therefore, the method reduces the output of the waste rinsing liquid in the acid washing, ensures the continuous and stable operation of the acid continuous rolling unit and the acid regeneration device, and solves the technical problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a cold-rolled strip steel pickling system and method, which can improve the rinsing efficiency of pickling solution attached to the surface of strip steel and reduce the consumption of desalted water in the rinsing process of strip steel.
Specifically, the following technical scheme is adopted in the application:
according to a first aspect of the embodiments of the present application, there is provided a cold-rolled strip steel pickling system, including: the pickling tank group is used for containing pickling solution so as to pickle strip steel and remove oxides on the surface of the strip steel; the rinsing bath group is used for containing desalted water so as to rinse the pickling solution attached to the surface of the strip steel; the at least two groups of rollers are arranged between the pickling tank group and the rinsing tank group and are used for driving the strip steel and pre-cleaning pickling solution attached to the surface of the strip steel; and the spraying device is arranged between the at least two groups of rollers and is used for spraying desalted water to the strip steel passing through the at least two groups of rollers so as to pre-rinse the pickling solution attached to the surface of the strip steel.
In some embodiments of the present application, based on the solution, the system further comprises a conductivity detection device and a control device, wherein the conductivity detection device is installed in the rinsing tank group and is used for detecting the conductivity value of the waste rinsing liquid generated in the rinsing tank group; the spraying device is also provided with a desalted water valve which is used for controlling the spraying device to spray desalted water to the strip steel passing through the at least two groups of rollers; the control device is used for controlling the opening and closing of the desalted water valve according to the conductivity value.
In some embodiments of the application, based on the solution, the system further comprises a first pipe for conducting the outflow of the pre-rinse solution at the at least two sets of rolls to the pickling line for diluting the pickling solution contained in the pickling line.
In some embodiments of the present application, based on the scheme, in rolling the strip bundle, the system further includes a waste water tank for collecting the waste rinse solution flowing out of the rinse bath group, and a second pipeline for delivering the waste rinse solution in the waste water tank to the acid bath group to dilute the acid bath solution contained in the acid bath group.
In some embodiments of the present application, based on the scheme, the system further comprises an iron ion content detection device, which is installed in the pickling tank set and is used for detecting an iron ion content value of the pickling solution in the pickling tank set; a waste rinsing liquid valve is further arranged on the second pipeline and used for controlling the second pipeline to convey the waste rinsing liquid in the waste water tank to the pickling tank group; and the control device is used for controlling the opening and closing of the waste rinsing liquid valve according to the iron ion content value of the pickling solution in the pickling tank group.
In some embodiments of the present application, based on the scheme, the system further comprises a third pipeline and an acid regeneration device, wherein the third pipeline is used for conveying the waste rinsing liquid in the waste water tank to the acid regeneration device so as to carry out acid regeneration treatment on the waste rinsing liquid in the waste water tank.
In some embodiments of the present application, based on the scheme, the system further comprises a desalted water tank for storing desalted water, and a fourth line for transferring the desalted water in the desalted water tank to the rinse tank group.
According to the second aspect of the embodiments of the present application, there is also provided a cold-rolled strip pickling method, which is implemented by using the cold-rolled strip pickling system according to the first aspect of the embodiments of the present application. The method comprises the following steps:
s1, driving the strip steel to pass through the pickling tank group, so that the pickling solution in the pickling tank group is used for pickling the strip steel;
s2, enabling the strip steel passing through the pickling bath group to enter the at least two groups of rollers so as to drive the strip steel through the at least two groups of rollers and pre-clean pickling solution attached to the surface of the strip steel;
s3, controlling a desalted water valve of the spray device to be opened or closed so as to control the spray device to spray desalted water to the strip steel passing through the at least two groups of rollers, so as to pre-rinse the pickling solution attached to the surface of the strip steel, and guiding the pre-rinsing solution flowing out of the at least two groups of rollers to the pickling tank group through the first pipeline so as to dilute the pickling solution contained in the pickling tank group;
s4, the strip steel passing through the at least two groups of rollers enters the rinsing bath group, so that desalted water in the rinsing bath group rinses the pickling solution attached to the surface of the strip steel;
s5, collecting the waste rinsing liquid flowing out of the rinsing tank group through the waste water tank;
and S6, conveying the waste rinsing liquid in the waste water tank to the acid regeneration device through the third pipeline to perform acid regeneration treatment on the waste rinsing liquid in the waste water tank, and controlling a waste rinsing liquid valve of the second pipeline to be opened or closed so as to control the second pipeline to convey the waste rinsing liquid in the waste water tank to the acid washing tank group to dilute the acid washing solution contained in the acid washing tank group.
In some embodiments of the present application, based on the scheme, the controlling of the opening or closing of the desalinated water valve of the spraying device includes: detecting the conductivity value of the waste rinsing liquid generated in the rinsing tank group through the conductivity detection device; if the conductivity value is larger than a first preset conductivity value, controlling the opening of the desalted water valve; and if the conductivity value is smaller than a second preset conductivity value, controlling the desalting water valve to be closed, wherein the first preset conductivity value is larger than the second preset conductivity value.
In some embodiments of the application, based on the scheme, the controlling the waste rinse liquid valve of the second pipeline to open or close comprises: detecting the iron ion content value of the pickling solution in the pickling tank group through the iron ion content detection device; if the iron ion content value is larger than a first preset iron ion content value, controlling the opening of the waste rinsing liquid valve; and if the iron ion content value is smaller than a second preset iron ion content value, controlling the waste rinsing liquid valve to be closed, wherein the first preset iron ion content value is larger than the second preset iron ion content value.
According to the technical scheme, the method has at least the following advantages and positive effects:
according to the scheme of the cold-rolled strip steel acid pickling system and the method, on one hand, the use amount of desalted water can be reduced, and the rinsing efficiency of acid pickling solution attached to the surface of the strip steel is improved; on the other hand, the problem that the output of the waste rinsing liquid is too large in the acid washing process and the acid regeneration device cannot timely digest and treat the output waste rinsing liquid can be solved, so that the consumption of fuel gas can be reduced, and the continuous and stable operation of the acid continuous rolling unit and the acid regeneration device is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 shows a schematic diagram of a cold-rolled strip pickling system according to an embodiment of the present application.
Detailed Description
The present application will be specifically explained below with reference to specific embodiments and examples, and the advantages and various effects of the present application will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are provided to illustrate and not to limit the application.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. If there is a conflict, the present specification will control.
Referring to fig. 1, a simplified diagram of a cold-rolled strip pickling system according to an embodiment of the present application is shown.
According to an exemplary embodiment of the present application, there is provided a cold-rolled steel strip pickling system 100, including:
the pickling bath group 101 is used for containing pickling solution to pickle strip steel and remove oxides on the surface of the strip steel.
And a rinsing groove set 103, wherein the rinsing groove set 103 is used for containing desalted water so as to rinse the pickling solution attached to the surface of the strip steel.
And the at least two groups of rollers 102 are arranged between the pickling tank group 101 and the rinsing tank group 103 and are used for driving the strip steel and pre-cleaning pickling solution attached to the surface of the strip steel.
And the spraying device 104 is arranged between the at least two groups of rollers 102, and is used for spraying desalted water to the strip steel passing through the at least two groups of rollers 102 so as to pre-rinse the pickling solution attached to the surface of the strip steel.
In one embodiment of the present application, the pickling tank set 101 may include a plurality of pickling tanks, wherein each pickling tank is connected in sequence, for example, as shown in fig. 1, the pickling tank set may include a pickling tank No. 1, a pickling tank No. 2, a pickling tank No. 3, and a pickling tank No. 4, which are connected in sequence, wherein the pickling solution is injected into the pickling tank No. 4 first, and the pickling solution flows into the pickling tank No. 3, the pickling tank No. 2, and the pickling tank No. 1 in sequence from the pickling tank No. 4.
In one embodiment of the present application, the rinse tank group 103 may include a plurality of rinse tanks, wherein the rinse tanks are sequentially connected, for example, as shown in fig. 1, the rinse tank group may include a rinse tank No. 1, a rinse tank No. 2, a rinse tank No. 3, and a rinse tank No. 4, which are sequentially connected, wherein the rinse tank No. 1 is first filled with desalted water, and the desalted water sequentially flows from the rinse tank No. 1 into the rinse tank No. 2, the rinse tank No. 3, and the rinse tank No. 4.
In the present application, the at least two sets of rollers 102 may be two sets of deviation rectifying wringing rollers for extruding the strip steel, and further pre-cleaning the residual pickling solution on the surface of the strip steel.
In this application, spray set 104 can be the spray beam, and its spray beam material can be the glass steel material, and the nozzle that adopts can be big interval, little flow PDVF material, and is further, can pass through the nozzle to the belted steel surface sprays the desalinized water.
In this application, the system further includes a conductivity detection device and a control device, the conductivity detection device is installed in the rinsing tank set 103 and is used for detecting the conductivity value of the waste rinsing liquid generated in the rinsing tank set 103, a desalted water valve is further installed on the spray device 104 and is used for controlling the spray device 104 to spray desalted water to the strip steel passing through the at least two groups of rollers 102, and the control device is used for controlling the opening and closing of the desalted water valve according to the conductivity value.
In the present application, the conductivity device is installed in the rinse tank group 103, and specifically, may be installed in any one of the rinse tanks in the rinse tank group 103, for example, the rinse tank No. 1 as shown in fig. 1.
In the present application, the system further comprises a first line 110, said first line 110 being adapted to direct the outflow of the pre-rinse solution at the at least two sets of rolls 102 to the pickling line group 101 for diluting the pickling solution contained in the pickling line group 101. In the present application, the first pipe 110 is used to guide the pre-rinse solution flowing out of the at least two groups of rolls 102 to the pickling tank group 101, and may be guided to the nearest pickling tank, for example, to the pickling tank No. 4 as shown in fig. 1.
It should be noted here that, under normal circumstances, the pickling solution injected into the pickling tank group needs to be diluted before pickling the strip steel to avoid excessive pickling of the strip steel surface by high-concentration acid, and in the prior art, a proper amount of desalted water is directly injected into the pickling tank group, which, however, may cause consumption of the desalted water.
In the present application, the system may further comprise a waste water tank 107 and a second pipeline 111, the waste water tank 107 being adapted to collect the waste rinse liquid flowing out of the rinse tank bank 103, the second pipeline 111 being adapted to transport the waste rinse liquid in the waste water tank 107 to the pickling tank bank 101 for diluting the pickling solution contained in the pickling tank bank 101.
In the present application, the second pipeline 111 is used for conveying the waste rinse liquid in the waste water tank 107 to the pickling tank group 101, and the second pipeline 111 may further include a plurality of pipeline branches, wherein the plurality of pipeline branches may convey the waste rinse liquid to each rinse tank in the rinsing tank group 103.
In this application, the system can also include iron ion content detection device, iron ion content detection device install in pickling bath group 101 for detect the iron ion content value of pickling solution in pickling bath group 101, still be equipped with useless rinsing liquid valve on the second pipeline 111, useless rinsing liquid valve is used for control second pipeline 111 will useless rinsing liquid in the waste water tank 107 is carried to pickling bath group 101, controlling means is used for the basis the iron ion content value of pickling solution in pickling bath group 101 controls opening and closing of useless rinsing liquid valve.
In the present application, the iron ion content detecting device is installed in the pickling tank set 101, and specifically, may be installed in any pickling tank in the pickling tank set 101.
In the present application, the scrubber tower 106, as in FIG. 1, may be an acid mist scrubber tower, the storage tank of which scrubber tower 106 may also be used to store spent rinse solution.
In the present application, the system may further include a third pipeline 112 and an acid regeneration device 105, wherein the third pipeline 112 is used for conveying the waste rinsing liquid in the waste water tank 107 to the acid regeneration device 105 so as to perform an acid regeneration process on the waste rinsing liquid in the waste water tank 107.
In the present application, the acid regeneration device 105 may be an acid regenerator train for acid regeneration of the collected spent acid in the pickling line group 101 and spent rinse solution in the waste water tank 107 to produce fresh pickling solution for injection into the pickling line group 101.
It should be noted here that, in the existing solution, all the waste rinse liquid in the rinse tank group is usually processed by an acid regeneration device, in order to ensure that the content of chloride ions in the residual liquid on the surface of the strip steel is less than 20mg/l and the content of iron-containing ions is less than 5mg/l, the consumption of desalted water during rinsing is huge (the actual consumption reaches 6.9 hours), so that the generated waste rinse water acid regeneration unit cannot be digested in time, the acid level balance problem of the acid rolling unit is difficult to be coordinated, and the continuous and stable operation of the acid rolling unit and the acid regeneration device is affected. Meanwhile, the cost is remarkably increased due to the obvious increase of the gas consumption for treating the waste rinsing water.
However, according to the solution proposed in the present application, by adding a pipeline (i.e. the second pipeline as described above) to transport part of the waste rinse solution produced in the rinse tank set to the pickling tank set, on one hand, the burden of the acid regeneration device on treating the waste rinse solution can be reduced, thereby avoiding the situation that the acid regeneration unit cannot timely digest and treat the waste rinse solution. On the other hand, the spent rinsing liquid after the surface of the strip steel is rinsed can be used to dilute the pickling solution in the pickling tank group, so that the consumption of desalted water can be reduced.
In the present application, the system further includes a desalted water tank 108 for storing desalted water, and a fourth line 113 for transferring the desalted water in the desalted water tank 108 to the rinse tank group 103.
In the present application, the acid bath group 101 and the rinse bath group 103 are further provided with pumps for delivering or flushing a liquid (e.g., an acid cleaning solution or desalted water) in the acid bath group, and the first, second, third, and fourth lines are also provided with pumps for delivering a liquid (e.g., an acid cleaning solution or desalted water), wherein the pumps may be acid-resistant pumps.
In the present application, the first pipeline, the second pipeline, the third pipeline and the fourth pipeline may further have control valves installed therein for controlling the pickling solution, the desalted water and the spent rinse solution, wherein the control valves may be manual control valves or automatic control valves.
The present application also proposes a cold-rolled strip pickling method implemented by the cold-rolled strip pickling system 100 as described above, wherein the method comprises:
s1, the strip steel is driven to pass through the pickling tank group 101, so that the pickling solution in the pickling tank group 101 is used for pickling the strip steel.
And S2, the strip steel passing through the pickling bath group 101 enters the at least two groups of rollers 102, so that the strip steel is driven by the at least two groups of rollers 102 and the pickling solution attached to the surface of the strip steel is pre-cleaned.
S3, controlling the desalted water valve of the spray device 104 to open or close, so as to control the spray device 104 to spray desalted water to the strip steel passing through the at least two groups of rolls 102, so as to pre-rinse the pickling solution attached to the surface of the strip steel, and guiding the pre-rinsing solution flowing out at the at least two groups of rolls 102 to the pickling tank group 101 through the first pipeline 110, so as to dilute the pickling solution contained in the pickling tank group 101.
S4, the strip steel passing through the at least two groups of rolls 102 enters the rinsing bath group 103, so that the desalted water in the rinsing bath group 103 rinses the pickling solution attached to the surface of the strip steel.
S5, collecting the waste rinsing liquid flowing out from the rinsing bath group 103 through the waste water tank 107.
S6, the waste rinse liquid in the waste water tank 107 is sent to the acid regeneration device 105 through the third pipeline 112 to perform an acid regeneration process on the waste rinse liquid in the waste water tank 107, and the waste rinse liquid valve of the second pipeline 111 is controlled to be opened or closed to control the second pipeline 111 to send the waste rinse liquid in the waste water tank 107 to the acid washing tank group 101 to dilute the acid washing solution contained in the acid washing tank group 101.
In the present application, the acid wash solution may be hydrochloric acid.
In this application, the controlling of the opening or closing of the desalted water valve of the spraying device 104 may include the following steps S31 to S33:
in step S31, the conductivity detection device detects the conductivity value of the waste rinse liquid generated in the rinse tank group 103.
And step S32, if the conductivity value is larger than a first preset conductivity value, controlling the opening of the desalted water valve.
Step S33, if the conductivity value is smaller than a second preset conductivity value, controlling the desalted water valve to be closed, wherein the first preset conductivity value is larger than the second preset conductivity value.
In this application, the desalting water valve of the spraying device 104 is controlled to be opened or closed, which may be based on the conductivity detection device detecting the conductivity value of the waste rinse liquid generated in the rinse tank set 103, and if the conductivity value of the rinse tank set 103 is higher, the more the residual pickling solution, the opening of the desalting water valve is controlled to flush the strip steel surface; and if the conductivity value in the rinsing tank group 103 belongs to a normal range, controlling the desalted water valve to be closed.
In one embodiment of the present application, the first preset conductivity value may be 90S/m (siemens/m) and the second preset conductivity value may be 60S/m.
In this application, the controlling of the opening or closing of the waste rinse valve of the second pipeline 111 may include steps S61 to S63 as follows: :
and step S61, detecting the iron ion content value of the pickling solution in the pickling tank group 101 through the iron ion content detection device.
And step S62, if the iron ion content value is larger than a first preset iron ion content value, controlling the opening of the waste rinsing liquid valve.
Step S63, if the iron ion content value is smaller than a second preset iron ion content value, controlling the waste rinse solution valve to close, wherein the first preset iron ion content value is larger than the second preset iron ion content value.
In one embodiment of the present application, the first predetermined iron ion content value may be 120g/L, and the second predetermined iron ion content value may be 90 g/L.
In the application, automatic and manual control options of an automatic waste rinsing liquid adding program can be added to an HMI operation interface, and the daily addition of the waste rinsing liquid is added to a report interface to detect the running state of the program.
According to the technical scheme, the method has the advantages and positive effects of at least the following aspects:
according to the scheme of the cold-rolled strip steel acid pickling system and method, on one hand, the use amount of desalted water can be reduced, and the rinsing efficiency of acid pickling solution attached to the surface of strip steel is improved; on the other hand, the problem that the output of the waste rinsing liquid is too large in the acid washing process and the acid regeneration device cannot timely digest and treat the output waste rinsing liquid can be solved, so that the consumption of fuel gas can be reduced, and the continuous and stable operation of the acid continuous rolling unit and the acid regeneration device is ensured.
While the present application has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present application may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (10)
1. A cold-rolled steel strip pickling system is characterized by comprising:
the pickling tank group is used for containing pickling solution so as to pickle strip steel and remove oxides on the surface of the strip steel;
the rinsing bath group is used for containing desalted water so as to rinse the pickling solution attached to the surface of the strip steel;
the at least two groups of rollers are arranged between the pickling tank group and the rinsing tank group and are used for driving the strip steel and pre-cleaning pickling solution attached to the surface of the strip steel;
and the spraying device is arranged between the at least two groups of rollers and is used for spraying desalted water to the strip steel passing through the at least two groups of rollers so as to pre-rinse the pickling solution attached to the surface of the strip steel.
2. The system of claim 1, further comprising conductivity detection means and control means, said conductivity detection means being mounted to said rinse tank bank for detecting conductivity values of waste rinse liquor produced in said rinse tank bank; the spraying device is also provided with a desalted water valve which is used for controlling the spraying device to spray desalted water to the strip steel passing through the at least two groups of rollers; the control device is used for controlling the opening and closing of the desalted water valve according to the conductivity value.
3. The system of claim 2, further comprising a first conduit for diverting the flow of pre-rinse solution outflowing at the at least two sets of rolls to the acid wash tank set to dilute the acid wash solution contained therein.
4. A system according to claim 3, further comprising a waste water tank for collecting waste rinse liquid flowing from the rinse tank bank, and a second line for conveying waste rinse liquid in the waste water tank to the pickling tank bank for diluting pickling solution contained in the pickling tank bank.
5. The system of claim 4, further comprising an iron ion content detection device mounted to said pickling line set for detecting an iron ion content value of a pickling solution in said pickling line set; a waste rinsing liquid valve is further arranged on the second pipeline and used for controlling the second pipeline to convey the waste rinsing liquid in the waste water tank to the pickling tank group; and the control device is used for controlling the opening and closing of the waste rinsing liquid valve according to the iron ion content value of the pickling solution in the pickling tank group.
6. A system according to claim 5, further comprising a third line for conveying the spent rinse liquid in the waste tank to the acid regeneration device for acid regeneration of the spent rinse liquid in the waste tank, and an acid regeneration device.
7. The system of claim 6, further comprising a desalted water tank for storing desalted water and a fourth line for delivering desalted water in the desalted water tank to the rinse tank bank.
8. A cold-rolled steel strip pickling method implemented by the cold-rolled steel strip pickling system of claim 7, comprising:
s1, driving the strip steel to pass through the pickling tank group so that the pickling solution in the pickling tank group can pickle the strip steel;
s2, enabling the strip steel passing through the pickling bath group to enter the at least two groups of rollers so as to drive the strip steel through the at least two groups of rollers and pre-clean pickling solution attached to the surface of the strip steel;
s3, controlling a desalted water valve of the spray device to be opened or closed so as to control the spray device to spray desalted water to the strip steel passing through the at least two groups of rollers, so as to pre-rinse the pickling solution attached to the surface of the strip steel, and guiding the pre-rinsing solution flowing out of the at least two groups of rollers to the pickling tank group through the first pipeline so as to dilute the pickling solution contained in the pickling tank group;
s4, the strip steel passing through the at least two groups of rollers enters the rinsing bath group, so that desalted water in the rinsing bath group rinses the pickling solution attached to the surface of the strip steel;
s5, collecting the waste rinsing liquid flowing out from the rinsing bath group through the waste water tank;
and S6, conveying the waste rinsing liquid in the waste water tank to the acid regeneration device through the third pipeline to perform acid regeneration treatment on the waste rinsing liquid in the waste water tank, and controlling a waste rinsing liquid valve of the second pipeline to be opened or closed so as to control the second pipeline to convey the waste rinsing liquid in the waste water tank to the acid washing tank group to dilute the acid washing solution contained in the acid washing tank group.
9. The method of claim 8, wherein the controlling the desalinated water valve of the spray device to open or close comprises:
detecting the conductivity value of the waste rinsing liquid generated in the rinsing tank group through the conductivity detection device;
if the conductivity value is larger than a first preset conductivity value, controlling the opening of the desalted water valve;
and if the conductivity value is smaller than a second preset conductivity value, controlling the desalting water valve to be closed, wherein the first preset conductivity value is larger than the second preset conductivity value.
10. The method of claim 8, wherein said controlling the opening or closing of the spent rinse valve of the second conduit comprises:
detecting the iron ion content value of the pickling solution in the pickling tank group through the iron ion content detection device;
if the iron ion content value is larger than a first preset iron ion content value, controlling the opening of the waste rinsing liquid valve;
and if the iron ion content value is smaller than a second preset iron ion content value, controlling the waste rinsing liquid valve to be closed, wherein the first preset iron ion content value is larger than the second preset iron ion content value.
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| CN202210712322.3A CN114959726A (en) | 2022-06-22 | 2022-06-22 | Cold-rolled strip steel acid pickling system and method |
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| CN202210712322.3A CN114959726A (en) | 2022-06-22 | 2022-06-22 | Cold-rolled strip steel acid pickling system and method |
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Cited By (1)
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| CN116213469A (en) * | 2023-04-24 | 2023-06-06 | 无锡炜业冷轧薄板有限公司 | Cold rolling mill roll surface attachment clearing device |
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