CN113981459A - Pickling acid regeneration control method - Google Patents
Pickling acid regeneration control method Download PDFInfo
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- CN113981459A CN113981459A CN202111220584.XA CN202111220584A CN113981459A CN 113981459 A CN113981459 A CN 113981459A CN 202111220584 A CN202111220584 A CN 202111220584A CN 113981459 A CN113981459 A CN 113981459A
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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
- 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
- C23G3/00—Apparatus for cleaning or pickling metallic material
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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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Abstract
The invention discloses a pickling acid regeneration control method, which is applied to a cold rolling system and comprises the following steps: adjusting the amount of waste acid discharged from an acid washing section to enable the concentration of free acid contained in the waste acid flowing into a waste acid tank to be 40-50 g/L; controlling the water supplement amount of desalted water in the rinsing line to be 4-5 m3H; detecting the liquid level of the rinsing water tank, and if the liquid level of the rinsing water tank is lower than 20-25% of the full liquid level, supplementing desalted water which is less than or equal to 30% of the full liquid level to the rinsing water tank; controlling the injection amount of waste acid and rinsing water received by a hydrochloric acid regeneration treatment system based on the concentration of free acid and the concentration of rinsing water generated by a rinsing line; controlling a hydrochloric acid regeneration treatment system to perform reverse reaction based on the injection amount of waste acid and rinsing water to generate target gas,and the target gas is conveyed to the regeneration acid tank, so that the acid concentration of the regeneration acid generated in the regeneration acid tank is 190-210 g/L. The method can effectively reduce the running cost of acid washing and acid regeneration.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a pickling acid regeneration control method.
Background
In the technical field of steel rolling, the main purpose of the pickling section is to pickle the iron scale on the surface of the strip steel by acid liquor (such as hydrochloric acid), and the strip steel is put into the pickling section and rinsed by the rinsing section after pickling to remove the residual hydrochloric acid on the surface of the strip steel, so as to facilitate the subsequent treatment process. The waste acid used for pickling is mainly ferrous chloride solution, the ferrous chloride solution is acted by using a roasting process of acid regeneration, so that the ferrous chloride solution is subjected to reverse reaction to generate hydrogen chloride gas, rinsing water generated by rinsing can be used for absorbing the hydrogen chloride gas, and then hydrochloric acid with a certain concentration is produced to be repeatedly supplied to a pickling section for use.
However, the regeneration control method for pickling acid adopted in the prior art cannot achieve efficient utilization of waste acid, and is not beneficial to reducing the operation cost.
Disclosure of Invention
The embodiment of the application provides a pickling acid regeneration control method, which can reasonably control the concentration of free acid of waste acid discharged from a pickling section on the premise of not influencing pickling quality, reduce the consumption of rinsing water, reduce the number of times of starting and stopping a furnace for acid regeneration, and is favorable for reducing the running cost of pickling acid regeneration.
The invention provides the following technical scheme through one embodiment of the invention:
a method for controlling regeneration of acid pickling acid comprises the following steps: the method is applied to a cold rolling system, the system comprises an acid washing section, a rinsing section and a hydrochloric acid regeneration treatment section, the hydrochloric acid regeneration treatment section comprises an acid regeneration system, a waste acid tank, a regeneration acid tank and a rinsing water tank, and the method comprises the following steps: adjusting the amount of spent acid discharged from the pickling section so that the spent acid flows to the spent acid tank and contains free acidThe acid concentration is 40-50 g/; controlling the water supplement amount of desalted water in the rinsing section to be 4-5 m3H; detecting the liquid level of the rinsing water tank, and if the liquid level of the rinsing water tank is lower than 20-25% of the full liquid level, supplementing desalted water which is less than or equal to 30% of the full liquid level to the rinsing water tank; controlling the injection amount of the spent acid and the rinse water received by the acid regeneration system based on the free acid concentration and the concentration of the rinse water produced by the rinse section; and controlling the acid regeneration system to perform reverse reaction based on the injection amount of the waste acid and the rinsing water, so that the concentration of the regenerated acid flowing into the regenerated acid tank is 190-210 g/L.
Preferably, the method further comprises: and when the pickling section is monitored to enter a maintenance stage, detecting whether the maintenance time of the pickling section is greater than or equal to a preset time, if so, controlling the feed flow of the acid regeneration system to the regenerated acid tank, so that the regenerated acid tank is in a full state when the pickling section is stopped.
Preferably, the fuel of the roasting furnace in the acid regeneration system is obtained at a flow rate of 5.5-5.8m3/h。
Preferably, the method further comprises: under the condition that the regenerated acid tank is full, when the pickling section is monitored to enter an overhaul stage, determining the operation mode of the acid regeneration system in the overhaul stage according to the time of stopping the pickling section, wherein the operation mode is a water mode, a heat preservation mode or a furnace shutdown mode, the water mode is the preheating process of the acid regeneration system, and the heat preservation mode is the energy-saving operation process of the acid regeneration system.
Preferably, the determining the operation mode of the acid regeneration system in the overhaul phase according to the time from the shutdown of the pickling section comprises: controlling the acid regeneration system to be in the furnace shutdown mode during the service phase when it is detected that the pickling section is about to be shut down within a first predetermined time; controlling the acid regeneration system to operate in the water mode for 4-6 hours in the service phase when it is detected that the acid wash section will be shut down within a second predetermined time; when it is detected that the pickling section will be shut down within a third predetermined time, controlling the acid regeneration system to operate in the maintenance mode for 8 hours in the overhaul period.
Preferably, the first predetermined time is 24 hours, the second predetermined time is 48 hours, and the third predetermined time is 72 hours.
Preferably, the method further comprises: controlling the acid content in the acid regeneration system to be 400-500m3Wherein the acid content is the content of neo-acids in the spent acid; controlling the total waste acid amount of the acid regeneration system below a first liquid level before the shutdown of the acid regeneration system; and controlling the total waste acid amount of the acid regeneration system before the point of the furnace to be above a second liquid level.
Preferably, the first level is 5% of a full level and the second level is the full level.
Preferably, the method further comprises: and in the production process of the pickling section in a shutdown state, controlling the water supplement amount of desalted water in the rinsing section to be 5% -7% of the full amount of the rinsing water tank supplemented per hour.
Preferably, the method further comprises: the pickling section further comprises a fresh acid tank, and the method further comprises: and in the production process of the pickling section in a shutdown state, controlling the new acid tank and the rinsing water tank to configure new regenerated acid into the regenerated acid tank.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the acid pickling acid regeneration control method provided by the embodiment of the invention is applied to a cold rolling system, and comprises the following steps: and adjusting the amount of waste acid discharged from the pickling section to enable the concentration of free acid contained in the waste acid flowing into the waste acid tank to be 40-50 g/L, so that the requirement of waste acid recycling is met. Controlling the water supplement amount of desalted water in the rinsing section to be 4-5 m3H is used as the reference value. And detecting the liquid level of the rinsing water tank, and if the liquid level of the rinsing water tank is lower than 20-25% of the full liquid level, supplementing desalted water which is less than or equal to 30% of the full liquid level to the rinsing water tank so that sufficient rinsing water is contained in the rinsing water tank. Controlling the injection of spent acid and rinse water received by the acid regeneration system based on the free acid concentration and the concentration of rinse water produced by the rinse sectionIn an amount such that the acid regeneration system produces sufficient regeneration. Based on the injection amount of waste acid and rinsing water, an acid regeneration system is controlled to perform reverse reaction to generate target gas, and the target gas is conveyed to a regeneration acid tank, so that the acid concentration of regeneration acid generated in the regeneration acid tank is 190-210 g/L. The recycling of the waste acid generated in the pickling section is controlled, so that the concentration of the free acid in the waste acid discharged from the pickling section is reasonably controlled, the consumption of rinsing water is reduced, the number of times of starting and stopping the furnace for acid regeneration is reduced, and the operation cost of pickling and acid regeneration can be comprehensively reduced on the premise of not influencing the pickling quality.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are 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 the drawings without creative efforts.
FIG. 1 is a flow chart of a method for controlling regeneration of acid pickling acids according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pickling acid regeneration control system according to an embodiment of the present invention.
Detailed Description
The embodiment of the application provides a pickling acid regeneration control method, which can reasonably control the concentration of free acid of waste acid discharged from a pickling section on the premise of not influencing pickling quality, reduce the using amount of rinsing water, and reduce the start-up and shutdown times of acid regeneration so as to comprehensively reduce the operation cost of pickling and acid regeneration.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
The pickling acid regeneration control method provided by the application can be applied to a cold rolling system, as shown in fig. 1, the cold rolling system comprises a pickling section 10, a rinsing section 20 and a hydrochloric acid regeneration treatment section 30, and the hydrochloric acid regeneration treatment section 30 comprises an acid regeneration system 301, a waste acid tank 302, a regenerated acid tank 303 and a rinsing water tank 304. Of course, the pickling acid regeneration control method can be applied to a system including a pickling section and a rinsing section, which is not limited herein, in addition to the cold rolling system.
Specifically, the pickling section 10 is connected with the rinsing section 20, the rinsing section 20 is located at the downstream of the pickling section 10, the output end of the waste acid tank 302 is connected with the input end of the acid regeneration system 30, the output end of the acid regeneration system 30 is connected with the regenerated acid tank 303, the regenerated acid tank 303 is respectively connected with the pickling section 10 and the output end of the rinsing water tank 304, and the other output end of the rinsing water tank 304 is connected with the acid regeneration system 30. In addition, the system also comprises a fresh acid tank 305, and the fresh acid tank 305 is connected with the regenerated acid tank 303 and used for providing fresh acid to the regenerated acid tank so as to replenish the acid lost by the regenerated acid system due to circulation. And the rinsing section further comprises a desalted water injection port 202 from which desalted water is to be injected into the rinsing section 20.
Note that the spent acid free acid means the acid that is not dissociated in the solution, and g/l is the mass volume concentration.
Specifically, as shown in fig. 2, the control method includes the following steps S101 to S104.
And S101, adjusting the amount of waste acid discharged from an acid washing section to enable the concentration of free acid contained in the waste acid flowing into a waste acid tank to be 40-50 g/L.
S102, controlling the water supplement amount of desalted water in a rinsing section to be 4-5 m3/h。
And S103, detecting the liquid level of the rinsing water tank, and if the liquid level of the rinsing water tank is lower than 20-25% of the full liquid level, supplementing desalted water which is less than or equal to 30% of the full liquid level into the rinsing water tank. It should be noted that the target steel plate may be a strip steel or other material requiring pickling.
In a specific embodiment, the amount of the waste acid automatically discharged in the pickling section can be adjusted, so that the concentration of free acid contained in the waste acid flowing into the waste acid tank is 40-50 g/L, the concentration range can ensure the pickling quality, the discharge amount of the waste acid is basically consistent with the production amount of an acid regeneration system, and the requirement of waste acid recycling is met. And in order to make it floatThe water washing tank contains sufficient rinsing water for recycling, and the water supplementing amount of desalted water in the rinsing section is controlled to be 4-5 m3The flow range can ensure that the conductivity of the rinsing tail section meets the requirement, and the generation amount of rinsing water is basically consistent with the use amount of an acid regeneration system.
Particularly, the liquid level of the rinsing water tank can be detected through a liquid level sensor, and when the liquid level of the rinsing water tank is detected to be lower than 20-25% of the full liquid level, desalted water which is less than or equal to 30% of the full liquid level is rapidly supplemented into the rinsing water tank at a larger water supplementing speed, for example: the water supplement amount is 8-10 m3H is used as the reference value. Therefore, a mode of less maintenance and replenishment is adopted, short time can be ensured, and desalted water waste caused by emergencies such as failure and shutdown of an acid regeneration system can be avoided.
And in the production process of the pickling section in a shutdown state, the water supplement amount of the desalted water in the rinsing section is controlled to be 5% -7% of the full amount of the rinsing water tank supplemented per hour, so that the system can control the water supplement amount of the desalted water according to the shutdown time of the pickling section to meet the normal operation of the rinsing section at low cost.
And step S104, controlling the injection amount of waste acid and rinsing water received by the acid regeneration system based on the concentration of the free acid and the concentration of the rinsing water generated by the rinsing section.
Specifically, the waste acid discharged from the waste acid tank and the rinse water discharged from the rinse water tank flow into the acid regeneration system, and the acid regeneration system carries out a roasting process on the received waste acid, so that the waste acid is concentrated to generate hydrogen chloride gas. And (4) absorbing hydrogen chloride gas generated in the furnace gas by using rinsing water to obtain regenerated acid, and enabling the regenerated acid to flow to a regenerated acid tank. In addition, waste gas generated by the acid regeneration system can be subjected to secondary absorption, and iron oxide red can be conveyed to the iron powder storage bin.
In particular embodiments, the injection of spent acid and rinse water received by the acid regeneration system will be controlled based on the free acid concentration and the concentration of rinse water produced by the rinse section. The concentration of the free acid received by the acid regeneration system is prevented from being too high, the hydrogen chloride gas generated by the acid regeneration system is too much, the water amount of the rinsing water is small, and the rinsing water and the hydrogen chloride gas cannot be continuously and uniformly fused, so that the recovery utilization rate is reduced.
Further, in order to obtain the regenerated acid with the acid content more meeting the recycling requirement, so that the roasting process of the acid regeneration system is more stable, the acid content in the acid regeneration system is controlled to be 400-500m3Wherein the acid content is the content of neo-acid in the waste acid. Ensuring that the amount of converted new acid in the acid regeneration system is 400-500m3In the meantime.
In order to prevent the acid regeneration system from being frequently started and closed, so that the utilization rate of the acid regeneration system is poor, the total amount of the acid regeneration system before furnace shutdown is controlled to be below a first liquid level, and the total amount of the acid regeneration system before furnace shutdown is controlled to be above a second liquid level. Specifically, before the acid regeneration system stops, the waste acid liquid level of the acid regeneration system is controlled to be at the lowest liquid level which can be reached, and before the acid regeneration system stops, the waste acid liquid level of the acid regeneration system is controlled to be at the highest liquid level which can be reached, so that the starting and stopping times of the regeneration treatment system are reduced. For example, the first level may be set to 5% of the full level and the second level may be set to the full level.
Further, in order to enable the regeneration treatment system to still maintain the operation for a long time when the pickling section is in the maintenance stage, when the pickling section is monitored to enter the maintenance stage, whether the maintenance time of the pickling section is greater than or equal to a preset time or not can be detected, if yes, the supply flow of the acid regeneration system to the regeneration acid tank is controlled, and the regeneration acid tank is in a full state when the pickling section is stopped. The determination of the predetermined time here may be designed according to the actual production situation, for example: the predetermined time was 12 hours.
Specifically, when the pickling section is overhauled for more than 12 hours, the system will control the supply flow of the acid regeneration system to the regeneration acid tank so that when the acid regeneration system is shut down, the regeneration acid tank has been produced to full level. For the embodiments provided herein, when the regeneration acid tank is produced to full level, the acid regeneration system may be shut down for 36-48 hours each time, except for the cool down time and the start-up oven time.
Further, in order to make the acid regeneration system have continuous and stable production capacity, so that the full amount of the regeneration acid tank can be obtained when the furnace is shut down next time, the obtaining flow rate of the fuel of the roasting furnace in the acid regeneration system can be 5.5-5.8m/h, of course, as long as the liquid level of the regeneration acid tank in the operation process can be continuously increased on the premise of not influencing normal production, and the obtaining flow rate of the fuel of the roasting furnace can be controlled according to actual production requirements when the furnace is shut down next time.
It should be noted that, in the production process in which the pickling section is in a shutdown state, the new acid tank and the rinsing water tank may also be controlled to dispose new regenerated acid into the regenerated acid tank. Specifically, when the regenerated acid in the process is insufficient, the regenerated acid in the fresh acid tank and the rinse water can be diluted and then flow into the regeneration tank to supplement the regenerated acid for the system.
And S105, controlling an acid regeneration system to perform reverse reaction based on the injection amount of the waste acid and the rinsing water, so that the concentration of the regenerated acid flowing into a regenerated acid tank is 190-210 g/L.
In particular embodiments, the acid regeneration system is capable of controlling the acid concentration of the regeneration acid produced in the furnace based on the injection amount of spent acid and rinse water. That is, as the injection amount of spent acid and rinse water is reduced, the concentration of regenerated acid produced will be correspondingly reduced.
Further, in order to reduce the running time of the acid regeneration system in a water mode and enable the acid regeneration system to run continuously and stably, under the condition that the regenerated acid tank is full, when the acid washing section enters the maintenance stage, the running mode of the acid regeneration system in the maintenance stage is determined according to the time when the acid washing section is stopped, wherein the running mode is a water mode, a heat preservation mode or a furnace shutdown mode, the water mode is the preheating process of the acid regeneration system, and the heat preservation mode is the energy-saving running process of the acid regeneration system.
Wherein, according to the time apart from the pickling section shutdown, the operation mode of the acid regeneration system in the maintenance stage is determined, and the method specifically comprises the following steps: when the acid washing section is detected to be shut down within a first preset time, controlling the acid regeneration system to be in a furnace shutdown mode in the overhaul stage; when the pickling section is detected to be shut down within a second preset time, controlling the acid regeneration system to operate in a 4-6 hour water mode in the maintenance stage; and when detecting that the pickling section is about to be stopped within a third preset time, controlling the acid regeneration system to operate in a heat preservation mode for 8 hours in the overhaul stage. The operation time of the water mode and the operation time of the heat preservation mode can be adjusted based on the actual situation in the field.
For example, the first predetermined time may be 24 hours, the second predetermined time may be 48 hours, and the third predetermined time may be 72 hours. Of course, the specific predetermined time can be adaptively adjusted according to actual production needs, and is not limited herein.
In conclusion, the pickling acid regeneration control method provided by the embodiment of the invention can reasonably control the concentration of free acid of the waste acid discharged from the pickling section, reduce the consumption of rinsing water, and reduce the furnace start and shutdown times of an acid regeneration system on the premise of not influencing the pickling quality, so as to comprehensively reduce the operation cost of pickling and acid regeneration.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A pickling acid regeneration control method is applied to a cold rolling system, the system comprises a pickling section, a rinsing section and a hydrochloric acid regeneration treatment system, the hydrochloric acid regeneration treatment section comprises an acid regeneration system, a waste acid tank, a regeneration acid tank and a rinsing water tank, and the method comprises the following steps:
adjusting the amount of waste acid discharged from the pickling section to enable the concentration of free acid contained in the waste acid flowing into the waste acid tank to be 40-50 g/L;
controlling the water supplement amount of desalted water in the rinsing section to be 4-5 m3/h；
Detecting the liquid level of the rinsing water tank, and if the liquid level of the rinsing water tank is lower than 20-25% of the full liquid level, supplementing desalted water which is less than or equal to 30% of the full liquid level to the rinsing water tank;
controlling the injection amount of the spent acid and the rinse water received by the acid regeneration system based on the free acid concentration and the concentration of the rinse water produced by the rinse section;
and controlling the acid regeneration system to perform reverse reaction based on the injection amount of the waste acid and the rinsing water, so that the concentration of the regenerated acid flowing into the regenerated acid tank is 190-210 g/L.
2. The method of claim 1, further comprising:
and when the pickling section is monitored to enter a maintenance stage, detecting whether the maintenance time of the pickling section is greater than or equal to a preset time, if so, controlling the feed flow of the acid regeneration system to the regenerated acid tank, so that the regenerated acid tank is in a full state when the pickling section is stopped.
3. The method of claim 1, wherein the roaster fuel in the acid regeneration system is withdrawn at a flow rate of 5.5 to 5.8m3/h。
4. The method of claim 1, further comprising:
under the condition that the regenerated acid tank is full, when the pickling section is monitored to enter an overhaul stage, determining the operation mode of the acid regeneration system in the overhaul stage according to the time of stopping the pickling section, wherein the operation mode is a water mode, a heat preservation mode or a furnace shutdown mode, the water mode is the preheating process of the acid regeneration system, and the heat preservation mode is the energy-saving operation process of the acid regeneration system.
5. The method of claim 4, wherein determining the operating mode of the acid regeneration system during the service phase based on the time since the acid wash section was shut down comprises:
controlling the acid regeneration system to be in the furnace shutdown mode during the service phase when it is detected that the pickling section is about to be shut down within a first predetermined time;
controlling the acid regeneration system to operate in the water mode for 4-6 hours in the service phase when it is detected that the acid wash section will be shut down within a second predetermined time;
when it is detected that the pickling section will be shut down within a third predetermined time, controlling the acid regeneration system to operate in the maintenance mode for 8 hours in the overhaul period.
6. The method of claim 5, wherein the first predetermined time is 24 hours, the second predetermined time is 48 hours, and the third predetermined time is 72 hours.
7. The method of claim 1, further comprising:
controlling the acid content in the acid regeneration system to be 400-500m3Wherein the acid content is the content of neo-acids in the spent acid;
controlling the total waste acid amount of the acid regeneration system below a first liquid level before the shutdown of the acid regeneration system;
and controlling the total waste acid amount of the acid regeneration system before the point of the furnace to be above a second liquid level.
8. The method of claim 7, wherein the first level is 5% of a full level and the second level is the full level.
9. The method of claim 1, further comprising:
and in the production process of the pickling section in a shutdown state, controlling the water supplement amount of desalted water in the rinsing section to be 5% -7% of the full amount of the rinsing water tank supplemented per hour.
10. The method of claim 1, wherein the hydrochloric acid regeneration treatment stage further comprises a fresh acid tank, the method further comprising:
and in the production process of the pickling section in a shutdown state, controlling the new acid tank and the rinsing water tank to configure new regenerated acid into the regenerated acid tank.
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Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3310435A (en) * | 1963-11-18 | 1967-03-21 | Dravo Corp | Process for continuous pickling of steel strip and regeneration of the contact acid |
| GB1561607A (en) * | 1976-07-02 | 1980-02-27 | Toledo Pickling Steel Serv | System for treating waste acids |
| US5057290A (en) * | 1990-04-23 | 1991-10-15 | Peterson Joseph C | Process and apparatus for the low temperature recovery of ferrous chloride from spent hydrochloric acid pickle liquors |
| US5800694A (en) * | 1995-02-15 | 1998-09-01 | Andritz-Patentverwaltungs-Gesellschaft M.B.H. | Process and plant for pickling materials made of steel, in particular stainless steel |
| KR20010084404A (en) * | 2000-02-25 | 2001-09-06 | 오순봉 | Recycling apparatus and Method of Waste Acid |
| EP1310581A2 (en) * | 2001-11-07 | 2003-05-14 | Andritz AG | Process for the treatment of waste water containing acids and metals |
| JP2003342764A (en) * | 2002-05-22 | 2003-12-03 | Mitsubishi Heavy Ind Ltd | Pickling device and pickling method |
| CA2492183A1 (en) * | 2002-07-10 | 2004-01-22 | Uvk Engineering Gmbh | Method and device for recycling metal pickling baths |
| DE102006056494A1 (en) * | 2006-11-30 | 2008-06-05 | Airmatic Gesellschaft für Umwelt und Technik mbH | Procedure for combined mechanic-hydraulic-chemical descaling of metal surface, comprises mechanically and/or hydraulically treating and reducing the material to be descaled in a high pressure sink unit |
| JP2010222602A (en) * | 2009-03-19 | 2010-10-07 | Kobe Steel Ltd | Pickling method and pickling equipment of metal material |
| CN102674251A (en) * | 2012-04-28 | 2012-09-19 | 佛山津西金兰冷轧板有限公司 | Waste acid recovery and treatment process |
| CN106868521A (en) * | 2017-02-24 | 2017-06-20 | 唐山钢铁集团有限责任公司 | A kind of cold-rolling pickling Rapid Circulation energy-saving equipment and method |
| CN206783765U (en) * | 2017-06-09 | 2017-12-22 | 山东钢铁股份有限公司 | A kind of acid regeneration equipment |
| CN110344067A (en) * | 2019-08-06 | 2019-10-18 | 北京首钢冷轧薄板有限公司 | A kind of steel band acid washing method |
| CN111974094A (en) * | 2020-08-31 | 2020-11-24 | 首钢智新迁安电磁材料有限公司 | Method and system for cleaning filter plate of desilication filter press |
-
2021
- 2021-10-20 CN CN202111220584.XA patent/CN113981459B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3310435A (en) * | 1963-11-18 | 1967-03-21 | Dravo Corp | Process for continuous pickling of steel strip and regeneration of the contact acid |
| GB1561607A (en) * | 1976-07-02 | 1980-02-27 | Toledo Pickling Steel Serv | System for treating waste acids |
| US5057290A (en) * | 1990-04-23 | 1991-10-15 | Peterson Joseph C | Process and apparatus for the low temperature recovery of ferrous chloride from spent hydrochloric acid pickle liquors |
| US5800694A (en) * | 1995-02-15 | 1998-09-01 | Andritz-Patentverwaltungs-Gesellschaft M.B.H. | Process and plant for pickling materials made of steel, in particular stainless steel |
| KR20010084404A (en) * | 2000-02-25 | 2001-09-06 | 오순봉 | Recycling apparatus and Method of Waste Acid |
| EP1310581A2 (en) * | 2001-11-07 | 2003-05-14 | Andritz AG | Process for the treatment of waste water containing acids and metals |
| JP2003342764A (en) * | 2002-05-22 | 2003-12-03 | Mitsubishi Heavy Ind Ltd | Pickling device and pickling method |
| CA2492183A1 (en) * | 2002-07-10 | 2004-01-22 | Uvk Engineering Gmbh | Method and device for recycling metal pickling baths |
| DE102006056494A1 (en) * | 2006-11-30 | 2008-06-05 | Airmatic Gesellschaft für Umwelt und Technik mbH | Procedure for combined mechanic-hydraulic-chemical descaling of metal surface, comprises mechanically and/or hydraulically treating and reducing the material to be descaled in a high pressure sink unit |
| JP2010222602A (en) * | 2009-03-19 | 2010-10-07 | Kobe Steel Ltd | Pickling method and pickling equipment of metal material |
| CN102674251A (en) * | 2012-04-28 | 2012-09-19 | 佛山津西金兰冷轧板有限公司 | Waste acid recovery and treatment process |
| CN106868521A (en) * | 2017-02-24 | 2017-06-20 | 唐山钢铁集团有限责任公司 | A kind of cold-rolling pickling Rapid Circulation energy-saving equipment and method |
| CN206783765U (en) * | 2017-06-09 | 2017-12-22 | 山东钢铁股份有限公司 | A kind of acid regeneration equipment |
| CN110344067A (en) * | 2019-08-06 | 2019-10-18 | 北京首钢冷轧薄板有限公司 | A kind of steel band acid washing method |
| CN111974094A (en) * | 2020-08-31 | 2020-11-24 | 首钢智新迁安电磁材料有限公司 | Method and system for cleaning filter plate of desilication filter press |
Non-Patent Citations (2)
| Title |
|---|
| 张兆朋;刘夏雯;田芳;: "浅析冷轧厂酸再生工艺设计", 科技创新与应用, no. 31, pages 908 * |
| 王笏曹: "《钢铁工业水处理实用技术与应用》", 北京：冶金工业出版社, pages: 908 * |
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