CN113319136A - Multistage laminar cooling cleaning and filtering system - Google Patents
Multistage laminar cooling cleaning and filtering system Download PDFInfo
- Publication number
- CN113319136A CN113319136A CN202110541677.6A CN202110541677A CN113319136A CN 113319136 A CN113319136 A CN 113319136A CN 202110541677 A CN202110541677 A CN 202110541677A CN 113319136 A CN113319136 A CN 113319136A
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- Prior art keywords
- laminar flow
- spray header
- flow cooling
- filter
- cooling
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000001816 cooling Methods 0.000 title claims abstract description 74
- 238000004140 cleaning Methods 0.000 title claims abstract description 25
- 238000001914 filtration Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- 239000007921 spray Substances 0.000 claims abstract description 47
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000011010 flushing procedure Methods 0.000 claims abstract description 26
- 239000002893 slag Substances 0.000 claims abstract description 25
- 229910052742 iron Inorganic materials 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 230000000903 blocking effect Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000010521 absorption reaction Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 7
- 239000012535 impurity Substances 0.000 description 5
- 238000011001 backwashing Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000011418 maintenance treatment Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0206—Coolants
-
- 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
Abstract
The invention discloses a multistage laminar flow cooling, cleaning and filtering system which comprises a machine-side pump station, wherein the machine-side pump station is connected with two cooling passages, a first manual valve, a regulating valve and a second manual valve are sequentially arranged on pipelines of the cooling passages, the other ends of the pipelines of the two cooling passages are respectively connected with the water inlet end of an upper spray header assembly and the water inlet end of a lower spray header assembly in a laminar flow cooling module, and the laminar flow cooling module is connected with a slag flushing ditch; the method is characterized in that: the slag flushing ditch is sequentially connected with a grating net, an iron sheet pit, a side filter, a cooling tower, a first filter, a water absorption well, a high-level water tank, a second filter and a machine side pump station. The invention can effectively solve the problems that the suspended matters at the source enter a water system to block the nozzle of the collecting pipe and the collecting pipe accumulates slag in the production process, and the problem of scaling can be fully solved by normal pre-charging protection.
Description
Technical Field
The invention relates to a multistage laminar flow cooling and cleaning filter system, in particular to a multistage laminar flow cooling and cleaning filter system.
Background
Laminar cooling is one of the special processes for producing hot rolled products, and temperature control is extremely important to the quality and performance of the plate shape of the product. An early laminar flow system is a common laminar flow cooling system, the traditional process flow is shown in figure 1, spray pipes are adopted by upper and lower collectors, the diameter of the spray pipe of the lower collector is 10-12mm, the diameter of the spray pipe of the upper collector is 20-22mm, larger suspended matters or sundries can pass through the spray pipe and can not be blocked basically, but along with improvement of the product quality requirement of the market, a plurality of production lines are reformed at present, an ultrafast cooling system, an encrypted cooling system and an even fast cooling system are provided, most of the collectors adopt nozzles, the calibers are small, the blockage is easy to occur, the blockage becomes one of key points influencing the quality, and the problem of nozzle blockage is solved and is the urgent need of improving the.
The basis of temperature control is the uniformity of the flow of each cooling section of the laminar cooling system, especially the uniformity of the transverse direction of the steel strip. The uniformity of the flow is determined by a plurality of factors such as system arrangement, pipeline design, consistency of flow coefficients of control valves, aperture accuracy of end users, water quality, operation maintenance level and the like, obviously, the first two factors are determined in the design and construction period, the third and the fourth factors are determined in the equipment modeling and manufacturing period, the possibility of change in the daily production process is extremely low, namely, the influence on the uniformity of the flow is extremely low, the water quality and the operation management level are variable factors in the daily production, because the laminar cooling system is an open circulating system, laminar cooling water pools, cooling towers, suction wells, elevated water tanks and laminar return square ditches are all open-air type structures, external factors have great influence on the water quality, such as iron scales, dry oil, thin oil, wood chips, cloth breaking, electrical insulating cloth, plastic bottles and the like enter the system in the production and maintenance process of a rolling line, and leaves exist in the open-air part daily, The traditional laminar flow system is only provided with a side filter system and an iron sheet pit (sedimentation tank), the side filter rate is generally 30-40 percent and is not more than 50 percent at most, so backflow water used by a user cannot be fully filtered, so that a considerable part of impurities entering the system, particularly suspended matters return to the user, the upper and lower collecting pipes of the laminar flow system are partially blocked, particularly the tail ends of the collecting pipes are seriously blocked, and the water outlet of all nozzles of the collecting pipes is uneven, in addition, the cooling collecting pipes are selectively used according to needs, wherein the lower collecting pipes which are extremely close to a steel plate are easy to be roasted and scaled due to high temperature, and are one of the reasons of the uneven water outlet blocked by the nozzles, generally, the water spray quantity of the water inlet end is large, the water spray quantity of the tail ends of the collecting pipes is small, and when the situation is serious, the water spray heights of two sides of a rolling line have considerable difference, and have great influence on the cooling uniformity of the cross section direction of a steel strip, the generated result is that the plate is warped and bent laterally when the plate is light, which may cause scrap steel on the spot, and the quality objections of improper product performance, longitudinal slitting bending and the like are generated when the plate is heavy, which greatly affects the benefit and image of enterprises.
For solving the jam and guaranteeing the cooling homogeneity, the on-site has adopted a multistage laminar flow cooling clean filtration system device, cuts off the circulating water large granule plug source from the source on the one hand, and on the other hand takes the pre-filling anti-scaling measure in time to carry out online back flush, guarantees that laminar flow system collector nozzle is clean unblocked, and water spray height and flow are unanimous, and the cooling is even, reduces maintenance work load simultaneously by a wide margin.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a multi-stage laminar flow cooling and cleaning filtration system which can solve the quality problems of poor plate shape, inadequate product performance and the like caused by uneven flow and uneven cooling due to blockage, slag accumulation and high-temperature scaling in the process caused by source suspended matters of a cooling header of a steel rolling laminar flow cooling system. The system is designed and installed at one time, and has the characteristics of low cost, simplicity, practicability, convenience in operation and maintenance and the like.
In order to achieve the purpose, the invention designs a multi-stage laminar flow cooling and cleaning filtration system which comprises an engine-side pump station, wherein the engine-side pump station is connected with two cooling passages, a first manual valve, a regulating valve and a second manual valve are sequentially arranged on a pipeline of each cooling passage, the other ends of the pipelines of the two cooling passages are respectively connected with the water inlet end of an upper spray header assembly and the water inlet end of a lower spray header assembly in a laminar flow cooling module, and the laminar flow cooling module is connected with a slag flushing ditch; the method is characterized in that: the slag flushing ditch is sequentially connected with a grating net, an iron sheet pit, a side filter, a cooling tower, a first filter, a water absorption well, a high-level water tank, a second filter and a machine side pump station.
Further, the second filter is also connected with the water inlet end of the lower spray header assembly.
Still further, a pre-charge valve is arranged on a pipeline between the second filter and the lower spray header assembly.
Still further, the blind plate end of the lower spray header assembly is also connected with a high-pressure water pipe.
And furthermore, a back flush valve is arranged on the high-pressure water pipe.
Still further, the upper spray header assembly includes a plurality of upper spray headers and the lower spray header assembly includes a plurality of lower spray headers.
And furthermore, the water inlet end of the lower spray header is connected with the slag flushing ditch.
And furthermore, a drain valve is arranged on the water inlet end of the lower spray header and a pipeline of the slag flushing ditch.
And furthermore, a ground slag blocking net is arranged on the iron sheet pit.
The working principle of the invention is as follows:
the cleaning and cleaning operation of the multi-stage laminar flow cooling cleaning and filtering system is implemented by utilizing the process operation or the shutdown maintenance time, impurities intercepted at the backwater inlet end of the iron pit, impurities intercepted at the fence of the iron pit, impurities intercepted by the filtering device of the cooling tower are removed, the filtering device of the high-level water tank is cleaned and cleaned, the backwashing device is started to perform backwashing on the lower collecting pipe, the normal pre-charging protection is performed to prevent the nozzle from scaling, so that the whole system is in a good working state in the production process, and particularly, the water yield of the collecting pipe is stable and uniform.
The invention has the beneficial effects that:
the production line process regulation or shutdown maintenance cycle of the multistage laminar flow cooling and cleaning filtration system of the invention is generally 7-10 days, the regulation time is 4-6 hours, the maintenance time is 8-16 hours, the laminar flow cooling multi-stage cleaning and filtering system device is cleaned and cleaned regularly by using the downtime, the back flushing is carried out on the laminar flow down header, the problems that the suspended matters at the source enter a water system to block the nozzle of the header and the header accumulates slag in the production process can be effectively solved, the problem of scaling can be fully solved by pre-charging protection in a normal state, the nozzle of the cooling water header is ensured to be clean and smooth, the water spraying height is consistent and the flow is uniform, the cooling uniformity of the transverse section of the strip steel after laminar flow is good, the plate type and the performance quality are obviously improved, and the quality objections of related products are obviously reduced, meanwhile, the workload of maintenance treatment of the end equipment before the device is used can be greatly reduced.
Drawings
FIG. 1 is a schematic view of a conventional laminar flow cooling system;
FIG. 2 is a schematic view of a multi-stage laminar flow cooling clean filtration system;
in the figure, an engine-side pump station 1, a first manual valve 2, a regulating valve 3, a second manual valve 4, a laminar flow cooling module 5, an upper spray header assembly 6, an upper spray header 6.1, a lower spray header assembly 7, a lower spray header 7.1, a slag flushing ditch 8, a grid net 9, an iron sheet pit 10, a ground slag blocking net 10.1, a side filter 11, a cooling tower 12, a first filter 13, a suction well 14, a high-level water tank 15, a second filter 16, a pre-charging valve 17, a high-pressure water pipe 18, a back-flushing valve 18.1 and a drain valve 19.
FIG. 3 is a comparison of the front and rear headers;
in the figure, A is before implementation, B is after implementation;
FIG. 4 is a comparison diagram of water quality before and after the system is applied.
Detailed Description
The present invention is described in further detail below with reference to specific examples so as to be understood by those skilled in the art.
The multistage laminar flow cooling cleaning and filtering system shown in fig. 2 comprises an engine-side pump station 1, wherein the engine-side pump station 1 is connected with two cooling passages, a first manual valve 2, a regulating valve 3 and a second manual valve 4 are sequentially arranged on pipelines of the cooling passages, the other ends of the pipelines of the two cooling passages are respectively connected with a water inlet end of an upper spray header assembly 6 and a water inlet end of a lower spray header assembly 7 in a laminar flow cooling module 5, the upper spray header assembly 6 comprises a plurality of upper spray headers 6.1, and the lower spray header assembly 7 comprises a plurality of lower spray headers 7.1;
the laminar cooling module 5 is connected with the slag flushing ditch 8; the slag flushing ditch 8 is sequentially connected with a grating net 9, an iron sheet pit 10, a side filter 11, a cooling tower 12, a first filter 13, a water suction well 14, a high-level water tank 15, a second filter 16 and a machine side pump station 1; a ground slag blocking net 10.1 is arranged on the iron pit 10; the second filter 16 is also connected with the water inlet end of the lower spray header assembly 7;
a pre-charging valve 17 is arranged on a pipeline between the second filter 16 and the lower spray header assembly 7; the blind plate end of the lower spray header assembly 7 is also connected with a high-pressure water pipe 18; a back flush valve 18.1 is arranged on the high pressure water pipe 18; the water inlet end of the lower spray header 7.1 is connected with the slag flushing ditch 8; a drain valve 19 is arranged on the water inlet end of the lower spray header 7.1 and the pipeline of the slag flushing ditch 8.
The technological process of the multistage laminar cooling and cleaning filtration system comprises the following steps:
the laminar cooling water used on site returns to the iron sheet pit after being blocked by the grid net at the tail end of the slag flushing ditch, and the ground slag blocking nets around the iron sheet pit intercept sundries so as not to enter the iron sheet pit. About 40% of water in the iron pit is sent to a filter for filtering and then sent to a cooling tower, the water cooled by the cooling tower is filtered by a filter device above a water suction well and then enters the water suction well, side filtered water is mixed with the water in the iron pit in the water suction well and then sent to a high-level water tank, and the water is filtered by the filter device arranged at the blind plate end of the high-level water tank and then sent to each layer of on-site flow cooling modules for use;
after the on-site laminar cooling module is used for a long time, part of fine impurities which cannot be completely filtered comprise iron scales, oil sludge and the like with very small granularity and can be deposited in the collecting pipe, particularly the lower collecting pipe, and a backwashing device is required to be periodically adopted for cleaning; during production, the regulating valve, the manual valve, the pre-charging valve are opened, the back flushing valve and the blow-down valve are closed, water is supplied to the lower collecting pipe by the system for cooling the steel belt, when the machine is stopped for cleaning, the regulating valve, the manual valve and the pre-charging valve are closed, the back flushing valve and the blow-down valve are opened, high-pressure water enters the collecting pipe through the back flushing valve for flushing, water and dirt after back flushing are discharged into a slag flushing ditch through the blow-down valve, and the production state is recovered after flushing is completed. The pre-charging valve is normally opened except in a back-flushing state so as to ensure that water is always stored in the collecting pipe and is sprayed out, and prevent the nozzles or nozzle pipes from being baked and scaled when part of the collecting pipe is not used.
After the method is implemented, the blockage of the nozzle of the collecting pipe is greatly improved, the water spraying amount of the collecting pipe is uniform, the cooling is uniform, the proportion of the temperature difference of the cross section after laminar flow being less than 50 ℃ is increased from 70% to 90%, and the temperature uniformity and the plate type quality of the cross section of the strip steel are improved (figures 3-4).
Other parts not described in detail are prior art. Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.
Claims (9)
1. A multi-stage laminar flow cooling cleaning and filtering system comprises an engine-side pump station (1), wherein the engine-side pump station (1) is connected with two cooling passages, a first manual valve (2), a regulating valve (3) and a second manual valve (4) are sequentially arranged on pipelines of the cooling passages, the other ends of the pipelines of the two cooling passages are respectively connected with a water inlet end of an upper spray header assembly (6) and a water inlet end of a lower spray header assembly (7) in a laminar flow cooling module (5), and the laminar flow cooling module (5) is connected with a slag flushing ditch (8); the method is characterized in that: the slag flushing ditch (8) is sequentially connected with a grating net (9), an iron sheet pit (10), a side filter (11), a cooling tower (12), a first filter (13), a water suction well (14), a high-level water tank (15), a second filter (16) and a machine side pump station (1).
2. The multi-stage laminar flow cooling cleaning and filtering system according to claim 1, wherein: the second filter (16) is also connected with the water inlet end of the lower spray header assembly (7).
3. The multi-stage laminar flow cooling cleaning and filtering system according to claim 1, wherein: a pre-charging valve (17) is arranged on a pipeline between the second filter (16) and the lower spray header assembly (7).
4. The multi-stage laminar flow cooling cleaning and filtering system according to claim 1, wherein: the blind plate end of the lower spray header assembly (7) is also connected with a high-pressure water pipe (18).
5. The multi-stage laminar flow cooling cleaning filtration system of claim 4, wherein: a back flush valve (18.1) is arranged on the high-pressure water pipe (18).
6. The multi-stage laminar flow cooling cleaning filtration system of claim 4, wherein: the upper spray header assembly (6) comprises a plurality of upper spray headers (6.1) and the lower spray header assembly (7) comprises a plurality of lower spray headers (7.1).
7. The multi-stage laminar flow cooling cleaning and filtering system according to claim 1, wherein: the water inlet end of the lower spray header pipe (7.1) is connected with the slag flushing ditch (8).
8. The multi-stage laminar flow cooling cleaning and filtering system according to claim 3, wherein: and a drain valve (19) is arranged on the water inlet end of the lower spray header (7.1) and a pipeline of the slag flushing ditch (8).
9. The multi-stage laminar flow cooling cleaning and filtering system according to claim 1, wherein: and a ground slag blocking net (10.1) is arranged on the iron sheet pit (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110541677.6A CN113319136A (en) | 2021-05-18 | 2021-05-18 | Multistage laminar cooling cleaning and filtering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110541677.6A CN113319136A (en) | 2021-05-18 | 2021-05-18 | Multistage laminar cooling cleaning and filtering system |
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| Publication Number | Publication Date |
|---|---|
| CN113319136A true CN113319136A (en) | 2021-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110541677.6A Pending CN113319136A (en) | 2021-05-18 | 2021-05-18 | Multistage laminar cooling cleaning and filtering system |
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Citations (7)
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|---|---|---|---|---|
| CN2785741Y (en) * | 2005-04-28 | 2006-06-07 | 中冶南方工程技术有限公司 | Combined water supplying and distributing device for controlled cooling of black strip |
| CN201276586Y (en) * | 2008-10-27 | 2009-07-22 | 北京埃德尔博珂工程技术有限公司 | Rear control cold apparatus of heat processing furnace |
| CN201439094U (en) * | 2009-08-25 | 2010-04-21 | 攀枝花新钢钒股份有限公司 | Hot rolling strip steel lubricating and conveying system |
| CN201760452U (en) * | 2010-08-06 | 2011-03-16 | 攀钢集团钢铁钒钛股份有限公司 | Ultrafast cooling system for hot tandem rolling strip steel and medium plate production lines |
| CN104805260A (en) * | 2015-04-10 | 2015-07-29 | 北京首钢股份有限公司 | Cooling water supply system and buffer water supply method thereof |
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-
2021
- 2021-05-18 CN CN202110541677.6A patent/CN113319136A/en active Pending
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| CN201760452U (en) * | 2010-08-06 | 2011-03-16 | 攀钢集团钢铁钒钛股份有限公司 | Ultrafast cooling system for hot tandem rolling strip steel and medium plate production lines |
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