CN111441063A - Belted steel alkali wash recovery system - Google Patents
Belted steel alkali wash recovery system Download PDFInfo
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- CN111441063A CN111441063A CN201910045708.1A CN201910045708A CN111441063A CN 111441063 A CN111441063 A CN 111441063A CN 201910045708 A CN201910045708 A CN 201910045708A CN 111441063 A CN111441063 A CN 111441063A
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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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- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a strip steel alkaline washing liquid recovery system which comprises a recovery tank for recovering waste liquid in an alkaline washing tank, wherein the recovery tank is communicated with the alkaline washing tank through a main pipeline, a plurality of shunt pipelines are arranged in the recovery tank and are connected with the main pipeline through pipeline shunts, a plurality of buffer grooves are formed in the wall of the recovery tank, the lower ends of the shunt pipelines extend into the buffer grooves, and the lower ends of the buffer grooves extend to the bottom of the tank wall; the top of the recovery tank is provided with a plurality of circles of spraying pipelines, and a plurality of nozzles used for spraying pure water to the foam generated in the recovery tank are connected below each spraying pipeline. By adopting the recovery system of the strip steel alkaline washing liquid, the foam can be prevented from overflowing from the recovery tank.
Description
Technical Field
The invention relates to the field of strip steel cleaning equipment, in particular to a strip steel alkaline washing liquid recovery system.
Background
Before the strip steel is treated in the post-working procedures of annealing, coating, plating and the like, an alkali washing process section is needed to be arranged for cleaning the surface of the strip steel, and impurities such as oil stains, iron powder, dust and the like on the surface of the strip steel are removed. Wherein, the strip steel cleaning liquid is mixed alkaline cleaning liquid prepared by sodium hydroxide with certain concentration and a degreasing agent according to a proportion, and the mixed alkaline cleaning liquid is heated to 70-85 ℃ to clean the surface of the strip steel. The waste liquid obtained after the strip steel cleaning contains the residual sodium hydroxide and the degreasing agent, and also contains pollutants such as grease, iron powder, dust and the like which are eluted from the surface of the strip steel. In order to save resources, the waste liquid is usually not directly discharged, enters a recovery tank through a pipeline, is subjected to centrifugal treatment or periodic discharge and other means to remove granular impurities, is supplemented with sodium hydroxide and a degreasing agent to a concentration range required by the process, and is refluxed into an alkaline washing tank through the pipeline for recycling.
Because the degreasing agent contains a large amount of surfactant components, a large amount of foams are inevitably generated after the waste liquid enters the recovery tank, and excessive foams overflow from the recovery tank, so that the loss of effective components in the waste liquid is caused, resources are wasted, the production cost is increased, and the production environment of an alkaline washing process section is polluted.
Aiming at the problems in the prior art, the novel recovery system for the alkaline washing liquid of the strip steel is significant.
Disclosure of Invention
In order to solve the problems, the invention provides a recovery system for strip steel alkaline washing liquid, which can avoid the overflow of foam from a recovery tank, thus saving resources, reducing production cost and avoiding pollution to production environment.
In order to achieve the purpose, the recovery system for the alkali washing liquid of the strip steel comprises a recovery tank for recovering waste liquid in an alkali washing tank, wherein the recovery tank is communicated with the alkali washing tank through a main pipeline, a plurality of shunt pipelines are arranged in the recovery tank and are connected with the main pipeline through pipeline shunts, a plurality of buffer grooves are formed in the wall of the recovery tank, the lower ends of the shunt pipelines extend into the buffer grooves, and the lower ends of the buffer grooves extend to the bottom of the tank wall; the top of the recovery tank is provided with a plurality of circles of spraying pipelines, and a plurality of nozzles used for spraying pure water to the foam generated in the recovery tank are connected below each spraying pipeline.
Preferably, the buffer flow groove is an S-shaped groove.
Preferably, the device further comprises a controller, and a radar liquid level meter for detecting the highest position of the foam in the recovery tank is arranged on the tank wall of the recovery tank;
the controller is configured to: receiving a signal of the highest foam position detected by the radar liquid level meter, calculating the distance between the highest foam position and the top of the recovery tank, setting the distance between the highest foam position and the top of the recovery tank as a first distance, and setting a first set value and a second set value in the controller.
Furthermore, a floating ball liquid level meter for detecting the liquid level in the recovery tank is also arranged on the tank wall of the recovery tank;
the controller is further configured to: receiving a liquid level signal of the liquid detected by the floating ball liquid level meter, calculating the distance between the liquid level of the liquid and the top of the recovery tank, setting the distance between the liquid level of the liquid and the top of the recovery tank as a second distance, setting a third set value in the controller, and controlling the nozzle to stop spraying when the second distance is reduced to the third set value.
The foam recovery device further comprises a foam tank, the foam tank is communicated with the recovery tank through a pressure reduction pipeline, a pressure reduction valve is arranged on the pressure reduction pipeline, and when the pressure reduction valve is opened, foam in the recovery tank can flow into the foam tank through the pressure reduction pipeline;
the controller is further configured to: when the first distance is equal to zero, the controller controls the pressure reducing valve to open; when the first distance increases to the first set value or more, the controller controls the pressure reducing valve to close.
Furthermore, the foam tank is connected with an air vent pipeline, the upper end of the air vent pipeline is communicated with the atmosphere, the lower end of the air vent pipeline is communicated with the foam tank, the pressure reduction pipeline is communicated with the air vent pipeline, and a nozzle used for spraying pure water to foam in the foam tank is arranged in the air vent pipeline.
According to the strip steel alkaline washing liquid recovery system, the diversion pipeline and the slow flow groove are arranged, so that waste liquid can be slowly drained to the bottom of the recovery tank, and the generation of foams is reduced; meanwhile, the nozzles are arranged at the top of the recovery tank, so that foam in the recovery tank is sprayed, partial foam can be eliminated, the foam is prevented from overflowing from the recovery tank, resources are saved, the production cost is reduced, and the pollution to the production environment is also avoided.
Drawings
FIG. 1 is a schematic system flow diagram of a recovery system of alkaline washing liquid of strip steel according to the present invention;
fig. 2 is a schematic view of the structure of the recovery tank of the present invention.
Detailed Description
The structure, operation, and the like of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, which is a schematic diagram of a system flow of the recovery system for the strip steel alkaline washing liquid of the present invention, the recovery system for the strip steel alkaline washing liquid includes a recovery tank 3 for recovering waste liquid in an alkaline washing tank 1, the recovery tank 3 is communicated with the alkaline washing tank 1 through a main pipeline 2, the waste liquid obtained after the alkaline washing liquid in the alkaline washing tank 1 cleans the surface of the strip steel enters the recovery tank 3 through the main pipeline 2, and the waste liquid is subjected to impurity removal in the recovery tank 3 and then flows back to the alkaline washing tank 1 through a return pipeline 4 for recycling. The waste liquid impurity removal of the recovery system shown in the figure is realized by periodic discharge, and specifically, a drain pipeline 5 for discharging liquid and a liquid supplementing pipeline 6 for supplementing pure alkaline washing liquid to the recovery tank 3 are connected to the bottom of the recovery tank 3. When the concentration of the liquid in the recovery tank 3 is detected to be beyond the concentration range required by the process, the sewage discharge pipeline 5 is opened to discharge part of the liquid, and meanwhile, the liquid supplementing pipeline 6 is opened to supplement pure alkaline washing liquid into the recovery tank 3, so that the concentration of the liquid in the recovery tank 3 is within the concentration range required by the process.
Referring to fig. 2, in order to reduce the amount of foam in the recovery tank 3 and avoid the foam to overflow, a plurality of shunt pipelines 13 are arranged in the recovery tank 3, the shunt pipelines 13 are connected with the main pipeline 2 through the pipeline shunt 12, a plurality of slow-release grooves (not shown in the figure) are arranged on the tank wall of the recovery tank 3, the lower ends of the shunt pipelines 13 extend to the slow-release grooves, and the lower ends of the slow-release grooves extend to the bottom of the tank wall. The waste liquid in the alkali wash tank 1 gets into pipeline shunt 12 by main line 2 and shunts the back, gets into corresponding reposition of redundant personnel pipeline 13 respectively to flow to the bottom of retrieving jar 3 along slow current groove, the waste liquid passes through the buffering in slow current groove, and the production of reducible foam compares conventional inlet channel, and the foam that produces can reduce 50% ~ 70%, has alleviateed considerable pressure for follow-up defoaming and the overflow of suppression foam. Preferably, the slow flow groove can be selected as an S-shaped groove, and the dotted line part in the figure is the state of the water flow in the slow flow groove.
In order to reduce the foam generated in the recovery tank 3 and further reduce the total amount of the foam, the top of the recovery tank 3 is provided with a plurality of circles of spraying pipelines 14, each spraying pipeline 14 surrounds along the circumferential direction of the recovery tank 3, each circle of spraying pipeline 14 is connected with a water inlet pipeline 7, a plurality of nozzles 15 used for spraying pure water to the foam generated in the recovery tank 3 are connected below each spraying pipeline 14, and the jet flow of each nozzle 15 can puncture the foam. In order to puncture the foam, a nozzle 15 with the aperture of 3-5 microns can be selected, and the distribution density of the nozzle 15 is 4/cm2The jet flow injection pressure of the nozzle 15 is preferably 10-20 MPa.
In order to save water resources, the nozzle 15 can intermittently spray the foam at the highest position in the recovery tank 3, and spray the foam at an excessively high position. In order to realize the automatic control of spraying, the alkaline washing liquid recovery system further comprises a controller, and a radar liquid level meter for detecting the highest position of the foam in the recovery tank 3 is arranged on the tank wall of the recovery tank 3.
The controller is configured to: the method comprises the steps of receiving a signal of the highest position of the foam detected by a radar liquid level meter, calculating the distance between the highest position of the foam and the top of a recovery tank 3, setting the distance between the highest position of the foam and the top of the recovery tank 3 as a first distance, arranging a first set value and a second set value in a controller, controlling a nozzle 15 to start spraying by the controller when the first distance is reduced to be below the first set value, and controlling the nozzle 15 to stop spraying by the controller when the first distance is increased to be above the second set value.
The pure water sprays and can lead to the liquid level in recovery tank 3 to rise gradually, if the liquid level is too high, can cause the liquid to spill over, consequently, still is equipped with the floater level gauge that is used for detecting the liquid level in recovery tank 3 on the jar wall of recovery tank 3. The controller is further configured to: and receiving a liquid level signal detected by the floating ball liquid level meter, calculating the distance between the liquid level and the tank top of the recovery tank 3, setting the distance between the liquid level and the tank top of the recovery tank 3 as a second distance, setting a third set value in the controller, and controlling the nozzle 15 to stop spraying by the controller when the second distance is reduced to the third set value.
Because of the change of production process parameters, the change of medicament types or the change of usage amount, the strip steel alkaline washing liquid recovery system can be subjected to violent fluctuation and instantaneous pressure, so that the foam generation speed is too high, the foam amount is too large, the foam eliminating speed by the spraying of the nozzle 15 cannot catch up with the foam generation speed, when the first distance calculated by the controller is equal to zero, the foam reaches the top of the recovery tank 3, and if the foam is not controlled in time, the phenomenon of foam overflow still occurs.
In order to avoid the phenomenon, the strip steel alkaline washing liquid recovery system further comprises a foam tank 8, the foam tank 8 is communicated with the recovery tank 3 through a pressure reducing pipeline 9, a pressure reducing valve is arranged on the pressure reducing pipeline 9, when the foam reaches the tank top of the recovery tank 3, the pressure reducing valve is opened, and the foam in the recovery tank 3 can flow into the foam tank 8 through the pressure reducing pipeline 9. Specifically, the controller is further configured to: when the first distance is equal to zero, the controller controls the pressure reducing valve to open; when the first distance increases above a first set value, the controller controls the pressure reducing valve to close.
In order to make the foam in the recovery tank 3 more easily enter the foam tank 8, the foam tank 8 is connected to a vent line 10, the upper end of the vent line 10 is connected to the atmosphere, the lower end is connected to the foam tank 8, a pressure reducing line 9 is connected to the vent line 10, and similarly, in order to prevent the foam in the foam tank 8 from overflowing, a nozzle (not shown) for spraying pure water to the foam in the foam tank 8 is provided in the vent line 10, and the nozzle 15 is supplied with water from a water inlet line 11 connected to the vent line 10.
In a specific implementation, the first set value may be set to 50cm, the second set value may be set to 100cm, and the third set value may be set to 30 cm. When the foam in the recovery tank 3 rises to a first distance of less than or equal to 50cm, the controller controls the nozzle 15 to be opened to spray the foam; under the jetting of pure water, when the foam drops to a first distance which is more than or equal to 100cm, the controller controls the nozzle 15 to close, and the jetting is stopped; when the liquid level in the recovery tank 3 rises to a second distance equal to 30cm, the controller controls the nozzle 15 to be closed; when the foam in the recovery tank 3 rises to a first distance equal to zero, the controller controls the pressure reducing valve to open; when the foam in the recovery tank 3 drops to a first distance which is more than or equal to 50cm, the controller controls the pressure reducing valve to close.
According to the strip steel alkaline washing liquid recovery system, the diversion pipeline 13 and the buffer tank are arranged, so that waste liquid can be slowly drained to the bottom of the recovery tank 3, and the generation of foams is reduced; meanwhile, the plurality of nozzles 15 are arranged at the top of the recovery tank 3, so that foam in the recovery tank 3 is sprayed, partial foam can be eliminated, the foam is prevented from overflowing from the recovery tank 3, resources are saved, the production cost is reduced, and the pollution to the production environment is also avoided.
The foregoing is merely illustrative of the present invention, and it will be appreciated by those skilled in the art that various modifications may be made without departing from the principles of the invention, and the scope of the invention is to be determined accordingly.
Claims (6)
1. A recovery system for alkaline washing liquid with steel is characterized by comprising a recovery tank for recovering waste liquid in an alkaline washing tank, wherein the recovery tank is communicated with the alkaline washing tank through a main pipeline, a plurality of shunt pipelines are arranged in the recovery tank and are connected with the main pipeline through pipeline shunts, a plurality of buffer grooves are formed in the wall of the recovery tank, the lower ends of the shunt pipelines extend into the buffer grooves, and the lower ends of the buffer grooves extend to the bottom of the tank wall; the top of the recovery tank is provided with a plurality of circles of spraying pipelines, and a plurality of nozzles used for spraying pure water to the foam generated in the recovery tank are connected below each spraying pipeline.
2. The strip steel alkaline washing liquid recovery system of claim 1, wherein the buffer tank is an S-shaped tank.
3. The strip steel alkaline washing liquid recovery system according to claim 1, further comprising a controller, wherein a radar liquid level meter for detecting the highest position of the foam in the recovery tank is arranged on the tank wall of the recovery tank;
the controller is configured to: receiving a signal of the highest foam position detected by the radar liquid level meter, calculating the distance between the highest foam position and the top of the recovery tank, setting the distance between the highest foam position and the top of the recovery tank as a first distance, and setting a first set value and a second set value in the controller.
4. The strip steel alkaline washing liquid recovery system according to claim 3, wherein a floating ball liquid level meter for detecting the liquid level in the recovery tank is further arranged on the tank wall of the recovery tank;
the controller is further configured to: receiving a liquid level signal of the liquid detected by the floating ball liquid level meter, calculating the distance between the liquid level of the liquid and the top of the recovery tank, setting the distance between the liquid level of the liquid and the top of the recovery tank as a second distance, setting a third set value in the controller, and controlling the nozzle to stop spraying when the second distance is reduced to the third set value.
5. The strip steel alkaline washing liquid recovery system according to claim 3, further comprising a foam tank, wherein the foam tank is communicated with the recovery tank through a pressure reducing pipeline, a pressure reducing valve is arranged on the pressure reducing pipeline, and when the pressure reducing valve is opened, foam in the recovery tank can flow into the foam tank through the pressure reducing pipeline;
the controller is further configured to: when the first distance is equal to zero, the controller controls the pressure reducing valve to open; when the first distance increases to the first set value or more, the controller controls the pressure reducing valve to close.
6. The strip steel alkaline washing liquid recovery system according to claim 5, wherein the foam tank is connected with an air vent pipeline, the upper end of the air vent pipeline is communicated with the atmosphere, the lower end of the air vent pipeline is communicated with the foam tank, the pressure reduction pipeline is communicated with the air vent pipeline, and a nozzle for spraying pure water to the foam in the foam tank is arranged in the air vent pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910045708.1A CN111441063B (en) | 2019-01-17 | 2019-01-17 | Belted steel alkali wash recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910045708.1A CN111441063B (en) | 2019-01-17 | 2019-01-17 | Belted steel alkali wash recovery system |
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| Publication Number | Publication Date |
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| CN111441063A true CN111441063A (en) | 2020-07-24 |
| CN111441063B CN111441063B (en) | 2022-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910045708.1A Active CN111441063B (en) | 2019-01-17 | 2019-01-17 | Belted steel alkali wash recovery system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59109209A (en) * | 1982-12-16 | 1984-06-23 | Mitsubishi Heavy Ind Ltd | Deaerating and defoaming method of sludge |
| JPH09299995A (en) * | 1996-05-20 | 1997-11-25 | Meidensha Corp | Antifoaming device in sewage sludge treatment |
| CN203080071U (en) * | 2013-03-06 | 2013-07-24 | 唐山建龙实业有限公司 | Liquid return pipe capable of reducing bubbles in degreasing line |
| CN203768464U (en) * | 2014-03-03 | 2014-08-13 | 中冶南方工程技术有限公司 | Degreasing fluid circulating tank capable of separating foam |
| CN204779830U (en) * | 2015-06-08 | 2015-11-18 | 中冶南方工程技术有限公司 | Defoaming device sprays |
| CN106430389A (en) * | 2016-10-27 | 2017-02-22 | 浙江大学苏州工业技术研究院 | Defoaming device and method for electrochemical wastewater treatment system |
-
2019
- 2019-01-17 CN CN201910045708.1A patent/CN111441063B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59109209A (en) * | 1982-12-16 | 1984-06-23 | Mitsubishi Heavy Ind Ltd | Deaerating and defoaming method of sludge |
| JPH09299995A (en) * | 1996-05-20 | 1997-11-25 | Meidensha Corp | Antifoaming device in sewage sludge treatment |
| CN203080071U (en) * | 2013-03-06 | 2013-07-24 | 唐山建龙实业有限公司 | Liquid return pipe capable of reducing bubbles in degreasing line |
| CN203768464U (en) * | 2014-03-03 | 2014-08-13 | 中冶南方工程技术有限公司 | Degreasing fluid circulating tank capable of separating foam |
| CN204779830U (en) * | 2015-06-08 | 2015-11-18 | 中冶南方工程技术有限公司 | Defoaming device sprays |
| CN106430389A (en) * | 2016-10-27 | 2017-02-22 | 浙江大学苏州工业技术研究院 | Defoaming device and method for electrochemical wastewater treatment system |
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| CN111441063B (en) | 2022-06-24 |
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