CN117403236A - Method for flushing and cleaning prefilming by blast furnace water system - Google Patents
Method for flushing and cleaning prefilming by blast furnace water system Download PDFInfo
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- CN117403236A CN117403236A CN202311249640.1A CN202311249640A CN117403236A CN 117403236 A CN117403236 A CN 117403236A CN 202311249640 A CN202311249640 A CN 202311249640A CN 117403236 A CN117403236 A CN 117403236A
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- blast furnace
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- water
- flushing
- backflushing
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 141
- 238000004140 cleaning Methods 0.000 title claims abstract description 57
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 13
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 10
- 239000012459 cleaning agent Substances 0.000 claims abstract description 10
- 230000007797 corrosion Effects 0.000 claims abstract description 9
- 238000005260 corrosion Methods 0.000 claims abstract description 9
- 239000003112 inhibitor Substances 0.000 claims abstract description 8
- 230000000536 complexating effect Effects 0.000 claims abstract description 6
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 238000005237 degreasing agent Methods 0.000 claims abstract description 4
- 239000013527 degreasing agent Substances 0.000 claims abstract description 4
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 6
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 4
- 239000010962 carbon steel Substances 0.000 claims description 4
- 239000003223 protective agent Substances 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000012752 auxiliary agent Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 2
- 238000011001 backwashing Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002357 osmotic agent Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/10—Cooling; Devices therefor
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
- C23C22/77—Controlling or regulating of the coating process
-
- 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
- C23G3/04—Apparatus for cleaning or pickling metallic material for cleaning pipes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a method for flushing and cleaning a prefilming by a blast furnace water system, which comprises the following steps: s1: adding a penetrating agent OG-702, a degreasing agent OG-603 and a defoaming agent into a water system, conveying water downwards into a blast furnace pipeline from the top of the blast furnace pipeline through a backflushing bypass, backflushing the blast furnace pipeline, circularly flushing for 3-5 h, monitoring turbidity, drawing a turbidity curve, and stopping flushing when an inflection point appears on the turbidity curve; s2: after S1, adding a stripping agent OG-501, a cleaning corrosion inhibitor OG-206, a complexing cleaning agent OG-602, an organic cleaning agent OG-601 and a defoaming agent into a water system, circularly cleaning for 15-24 hours, conveying water downwards from the top of a blast furnace pipeline into the blast furnace pipeline through a backflushing bypass, backflushing and flushing the blast furnace pipeline, circularly cleaning for 15-24 hours, monitoring an iron ion index, drawing an iron ion curve, and stopping cleaning when an inflection point appears on the iron ion curve. The cleaning is performed by adopting a back flushing mode from top to bottom, so that dirt such as scale and the like can be effectively discharged, and a blast furnace pipeline can be conveniently flushed.
Description
Technical Field
The invention relates to the field of steel production, in particular to a method for flushing and cleaning a prefilming by a blast furnace water system.
Background
The water supply of the existing blast furnace water system is mostly carried out from bottom to top, as shown in fig. 1, the water system is directly put into use after being washed once before being used, and foreign matters still exist in a cooling wall pipe by adopting the water system from bottom to top. No flushing, cleaning and prefilming are performed during production, and the cooling wall is used for a long period without cleaning scale in the pipe to reduce the thermal performance. The furnace life is shortened, the utilization coefficient of the blast furnace is reduced, and the cooling wall is frequently maintained or replaced in the future.
Disclosure of Invention
The invention aims to provide a method for washing prefilming by a blast furnace water system, which adopts a back flushing mode from top to bottom to wash, can effectively discharge dirt such as scale and the like, can conveniently wash a blast furnace pipeline by arranging a back flushing bypass, and is beneficial to periodically washing the blast furnace pipeline in production.
The method for flushing and cleaning the prefill membrane of the blast furnace water system is characterized in that the blast furnace water system is provided with a backflushing bypass, an inlet of the backflushing bypass is communicated with an outlet of a main supply pump, and an outlet of the backflushing bypass is communicated with a backwater main pipe; the method for flushing and cleaning the prefilming by the blast furnace water system comprises the following steps: s1: adding a penetrating agent OG-702, a degreasing agent OG-603 and a defoaming agent into a water system, conveying water downwards into a blast furnace pipeline from the top of the blast furnace pipeline through a backflushing bypass, backflushing the blast furnace pipeline, circularly flushing for 3-5 h, monitoring turbidity, drawing a turbidity curve, and stopping flushing when an inflection point appears on the turbidity curve; s2: after S1, adding a stripping agent OG-501, a cleaning corrosion inhibitor OG-206, a complexing cleaning agent OG-602, an organic cleaning agent OG-601 and a defoaming agent into a water system, circularly cleaning for 15-24 hours, conveying water downwards from the top of a blast furnace pipeline into the blast furnace pipeline through a backflushing bypass, backflushing and flushing the blast furnace pipeline, circularly cleaning for 15-24 hours, monitoring an iron ion index, drawing an iron ion curve, and stopping cleaning when an inflection point appears on the iron ion curve.
In one embodiment, in the blast furnace water system, a first cutoff device and a blow-off valve are arranged between a backflushing bypass inlet and a bottom inlet of the blast furnace, the first cutoff device is positioned between the blow-off valve and the backflushing bypass inlet, and the method for flushing and cleaning the prefill in the blast furnace water system further comprises: a second cutoff device is arranged between the outlet of the backflushing bypass and the inlet of the water station; before S1, S0: and opening the blow-down valve, back flushing a pipeline in the blast furnace with water of the water station, and discharging wastewater flowing out of the bottom of the pipeline of the Cong Gao furnace from the blow-down valve.
In one embodiment, in the blast furnace water system, the outlet of the blow-down valve is communicated with the water return main pipe, and the method for flushing and cleaning the prefilm by the blast furnace water system further comprises the following steps: and S1, S2, water flowing out of the blast furnace pipe flows into a water return main pipe from the blow-down valve for circular flushing.
In one embodiment, the method for flushing and cleaning the prefilm by the blast furnace water system further comprises: in S1 or S2, the pump interval in the water system is subjected to operation cleaning of the switching pump.
In one embodiment, the method for flushing and cleaning the prefilm by the blast furnace water system further comprises: in S1, a part of the water is replaced according to the turbidity of the water after washing.
In one embodiment, the method for flushing and cleaning the prefilm by the blast furnace water system further comprises: after S1 and before S2, the water in the blast furnace pipeline is emptied and refilled.
In one embodiment, the method for flushing and cleaning the prefilm by the blast furnace water system further comprises: and (3) performing pretreatment S3 after back flushing and cleaning: adding a prefilming agent OG-308A, a prefilming auxiliary agent OG-308B and a copper corrosion inhibitor OG-205 into the water system, and performing circulating prefilming for 48-60 hours.
In one embodiment, the method for flushing and cleaning the prefilm by the blast furnace water system further comprises: in S3, the water flow direction is the same as that of the backwash cleaning.
In one embodiment, the method for flushing and cleaning the prefilm by the blast furnace water system further comprises: s4 is performed after S3: replacing with desalted water, gradually replacing with desalted water with the supply capacity of about 50m & lt 3 & gt/h until the hardness of the system water is less than or equal to 15mg/L and the turbidity is less than or equal to 5NTU, adding a film protecting agent in the replacement process, and regulating the PH to be 8.0-10.0.
In one embodiment, the method for flushing and cleaning the prefilm by the blast furnace water system further comprises: and taking the backflushing bypass as a blast furnace bypass, and hanging carbon steel or stainless steel or copper hanging sheets on the backflushing bypass to monitor the prefilming effect of S3.
Compared with the prior art, the method for flushing and cleaning the prefilming by the blast furnace water system has the advantages that:
1. the conventional water inlet is used for supplying water from the bottom of the blast furnace upwards, although the boiler is heated, scale deposition is easy to cause, and the invention can flush dirt such as scale from the blast furnace downwards by arranging the backflushing bypass, so as to flush the dirt such as the scale out of a pipeline of the blast furnace, thoroughly flush the blast furnace water pipe, avoid blockage, conveniently flush the blast furnace pipeline by arranging the backflushing bypass, and be beneficial to periodically cleaning the blast furnace pipeline in production. And the water system is firstly added with the penetrating agent OG-702, the degreasing agent OG-603 and the defoaming agent, then the stripping agent OG-501, the cleaning corrosion inhibitor OG-206, the complexing cleaning agent OG-602, the organic cleaning agent OG-601 and the defoaming agent are added for cleaning, so that the water system has better dirt and rust removing effects, and can be used for cleaning and rust preventing the water system pipeline for a long time.
2. When the back flushing cleaning is carried out, the first cutting-off device and the second cutting-off device are closed, the blow-down valve is opened, and water and impurities flowing out of the blast furnace pipeline are discharged through the blow-down valve. The backflushing bypass is provided with a backflushing valve which is closed to close the backflushing pipeline when the blast furnace works normally. The backflushing bypass does not influence the normal operation of the blast furnace, is flexible to open and close, can be conveniently backflushed and cleaned, and is beneficial to the descaling and maintenance of the conventional blast furnace.
3. The backflushing bypass can be used as a blast furnace bypass, carbon steel or stainless steel or copper hanging sheets are hung on the backflushing bypass to monitor the prefilming effect, and prefilming operation is conveniently and intuitively carried out on site.
4. After the prefilming is completed, replacing the pretreated water with desalted water, gradually replacing the pretreated water until the hardness of the system water is less than or equal to 15mg/L and the turbidity is less than or equal to 5NTU according to the desalted water supply capacity of about 50m & lt 3 & gt/h, adding a film protecting agent in the replacement process, and regulating the PH to be 8.0-10.0. Protecting the new membranous material from damage.
The invention will become more apparent from the following description taken in conjunction with the accompanying drawings which illustrate embodiments of the invention.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a conventional blast furnace water system;
FIG. 2 is a schematic diagram of a flush bypass according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a blast furnace water system according to an embodiment of the present invention.
The device comprises a blast furnace, 11, a cooling wall, 12, a water cooling pipe, 2, a water station, 21, a main supply pump, 22, a high-pressure pump, 23, a medium-pressure pump, 24, a dosing device, 3, a backflushing bypass, 31, a first cutting device, 32, a second cutting device, 33, a blow-down valve, 34, a backflushing valve, 35, a backflow valve, 36, a filtering device, 41, a water inlet main pipe, 42, a water return main pipe, 43, a water return loop pipe, 44, a back pump pressurizing pipe, 51, an air port small sleeve, 52, an air port middle sleeve, 53, a deoxidizing tank, 54, an expansion tank, 55 and an air cooler.
Detailed Description
Embodiments of the present invention will now be described with reference to the accompanying drawings.
In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
This embodiment is shown in fig. 2 and 3. The blast furnace water system is provided with a backflushing bypass 3, an inlet of the backflushing bypass 3 is communicated with an outlet of the main supply pump 21, and an outlet of the backflushing bypass 3 is communicated with a backwater main pipe 42; a first cutoff device 31 and a blow-down valve 33 are arranged between the inlet of the backflushing bypass 3 and the inlet at the bottom of the blast furnace 1, the first cutoff device 31 is positioned between the blow-down valve 33 and the inlet of the backflushing bypass 3, and a second cutoff device 32 is arranged between the outlet of the backflushing bypass 3 and the inlet of the water station 2; the outlet of the blow-down valve 33 is communicated with the return water main pipe 42, and a reflux valve 35 and a filtering device 36 are arranged between the blow-down valve 33 and the return water main pipe 42. The blast furnace 1 piping comprises a stave 11 and a water cooling pipe 12 in parallel, a serpentine pipe, etc. The backflushing bypass 3 is provided with a backflushing valve 34, and the backflushing valve 34 is closed to close the backflushing line when the blast furnace 1 is operating normally. A dosing device 24 is arranged upstream of the main supply pump 21, through which dosing device 24 a corresponding medicament can be dosed into the water system. In this embodiment, the first cutoff device 31 and the second stage device are blind plates.
The invention relates to a method for flushing and cleaning a prefilming by a blast furnace water system, which comprises the following steps:
s0: before S1, the first shut-off device 31 and the second shut-off device 32 are closed, the drain valve 33 is opened, and the return valve 35 is closed to shut off the line from the outlet of the drain valve 33 to the return water manifold 42. The pipeline in the blast furnace 1 is reversely flushed by water of the water station 2, and the wastewater flowing out of the bottom of the pipeline of the Cong Gao furnace 1 is discharged from the blow-down valve 33;
s1: closing the first cut-off device 31 and the second cut-off device 32, opening the blow-off valve 33, opening a pipeline from the outlet of the blow-off valve 33 to the return water main pipe 42, closing the other outlet path of the blow-off valve 33 by using a blind plate, and returning water and impurities flowing out of the bottom of the pipeline of the blast furnace 1 to the return water main pipe 42 for circulating cleaning through the blow-off valve 33. Adding an osmotic agent OG-702, an oil removing agent OG-603 and an antifoaming agent into the water system, wherein the agents have amphiprotic property, change the interface between water and oil, and permeate into greasy dirt and the like on the metal wall, so that the agents are gradually emulsified and dissolved into the water to be discharged along with the water; the conveying water flows through a backflushing bypass 3 and is downwards input into the pipeline of the blast furnace 1 from the top of the pipeline of the blast furnace 1, backflushing flushing is carried out on the pipeline of the blast furnace 1, the circulating flushing is carried out for 3-5 hours, turbidity is monitored, a turbidity curve is drawn, and the turbidity is monitored once every two hours; stopping flushing when the turbidity curve has an inflection point;
after S1 and before S2, draining the water in the pipeline of the blast furnace 1 and refilling the water;
s2: after S1, adding a stripping agent OG-501, a cleaning corrosion inhibitor OG-206, a complexing cleaning agent OG-602, an organic cleaning agent OG-601 and a defoaming agent into a water system, and dissolving the materials into water through permeation stripping and complexing loosening, so as to oxidize and generate rust residues, and discharging scale generated in the long-term operation process; the conveying water flows through a backflushing bypass 3 and is downwards input into the pipeline of the blast furnace 1 from the top of the pipeline of the blast furnace 1, backflushing flushing is carried out on the pipeline of the blast furnace 1, the circulating cleaning is carried out for 15-24 hours, the iron ion index is monitored, an iron ion curve is drawn, in S2, the PH value is monitored once every hour, and the iron ion is monitored once every two hours; stopping cleaning when the inflection point appears on the iron ion curve; the PH value is controlled to be 5.0-6.0 in the cleaning process;
s3: after S2, performing pre-film treatment, adding a pre-film agent OG-308A, a pre-film auxiliary agent OG-308B and a copper corrosion inhibitor OG-205 into a water system, and rapidly forming a layer of compact and uniform protective film on the metal surface to separate water from equipment and prevent equipment corrosion; and (5) performing circulating prefilming for 48-60 hours. Controlling the PH and the concentration of the medicament, measuring the PH once every 2 hours and measuring the concentration of the medicament once every 4 hours; performing reverse pump operation during the cyclic prefilming period, and circularly prefilming; in S3, the water flow direction of the prefilming is the same as that of the backwash cleaning. The impurity can be continuously reversely washed, and the washing effect is further improved. The water flowing from the blow down valve 33 passes through the filter device 36 and returns from the return water manifold 42 to the water station 2. Further enhancing the decontamination effect. However, the present embodiment is not limited thereto, and the blow-off valve 33 may be closed, the first intercepting device 31 and the second intercepting device 32 may be opened, and the forward prefilming may be performed in a circulating manner, or the forward prefilming and the reverse prefilming may be performed in a staggered manner, and the occurrence of a system empty pipe should be avoided during prefilming and after prefilming is completed;
s4: after S3, replacing with desalted water, gradually replacing until the hardness of system water is less than or equal to 15mg/L and the turbidity is less than or equal to 5NTU according to the desalted water supply capacity of about 50m & lt 3 & gt/h, adding a film protecting agent in the replacement process, and adjusting the PH to be 8.0-10.0, so that the new film quality can be protected from being damaged.
In S1 or S2, the pump interval in the water system is subjected to operation cleaning of the switching pump.
Wherein, in S1, a part of water is replaced according to the turbidity of the water after flushing. The replacement part of the water is to discharge part of the water through the drain valve 33 and to supplement the water system with water.
In the invention, the backflushing bypass 3 can be used as a bypass of the blast furnace 1, when S3 prefilming is carried out, the blow-off valve 33 is closed, the first cutoff device 31 and the second cutoff device 32 are opened, the main supply pump 21 conveys water part of the water station 2 to return to the backwater main pipe 42 (opposite to the direction of square flushing) from bottom to top through a pipeline of the blast furnace 1 and part of the water part passes through the backflushing bypass, and carbon steel, stainless steel or copper hanging pieces are hung on the backflushing bypass 3 to monitor the prefilming effect of S3.
In general, the water is supplied to the blast furnace 1 from the bottom of the blast furnace 1, and although the water is favorable for heating a boiler, scale deposition is easily caused.
The invention has been described in connection with the preferred embodiments, but the invention is not limited to the embodiments disclosed above, but it is intended to cover various modifications, equivalent combinations according to the essence of the invention.
Claims (10)
1. The method for flushing and cleaning the prefill membrane of the blast furnace water system is characterized in that the blast furnace water system is provided with a backflushing bypass, an inlet of the backflushing bypass is communicated with an outlet of a main supply pump, and an outlet of the backflushing bypass is communicated with a backwater main pipe;
characterized in that the method comprises:
s1: adding a penetrating agent OG-702, a degreasing agent OG-603 and a defoaming agent into a water system, conveying water downwards into a blast furnace pipeline from the top of the blast furnace pipeline through a backflushing bypass, backflushing the blast furnace pipeline, circularly flushing for 3-5 h, monitoring turbidity, drawing a turbidity curve, and stopping flushing when an inflection point appears on the turbidity curve;
s2: after S1, adding a stripping agent OG-501, a cleaning corrosion inhibitor OG-206, a complexing cleaning agent OG-602, an organic cleaning agent OG-601 and a defoaming agent into a water system, circularly cleaning for 15-24 hours, conveying water downwards from the top of a blast furnace pipeline into the blast furnace pipeline through a backflushing bypass, backflushing and flushing the blast furnace pipeline, circularly cleaning for 15-24 hours, monitoring an iron ion index, drawing an iron ion curve, and stopping cleaning when an inflection point appears on the iron ion curve.
2. The method of flushing and cleaning a prefill in a blast furnace water system according to claim 1, wherein a first shut-off device and a blow down valve are provided between a backflushing bypass inlet and a bottom inlet of the blast furnace, the first shut-off device being located between the blow down valve and the inlet of the backflushing bypass, the method further comprising:
a second cutoff device is arranged between the outlet of the backflushing bypass and the inlet of the water station;
before S1, S0: and opening the blow-down valve, back flushing a pipeline in the blast furnace with water of the water station, and discharging wastewater flowing out of the bottom of the pipeline of the Cong Gao furnace from the blow-down valve.
3. The method for flushing and cleaning prefilm in a blast furnace water system according to claim 2, wherein the outlet of said blow down valve is connected to a return water main, said method further comprising:
and S1, S2, water flowing out of the blast furnace pipe flows into a water return main pipe from the blow-down valve for circular flushing.
4. The method for flushing and cleaning prefilming of a blast furnace water system according to claim 1, wherein in S1 or S2, the pump interval in the water system is cleaned by reversing the pump operation.
5. The method for washing a prefilm in a blast furnace water system according to claim 1, wherein in S1, a part of water is replaced according to turbidity of the washed water.
6. A method for flushing and cleaning prefill in a blast furnace water system according to claim 1, characterized in that after S1, before S2, the water in the blast furnace pipe is emptied and refilled.
7. The method for washing and cleaning a prefilm in a blast furnace water system according to claim 1, wherein the prefilm treatment S3 is performed after the back washing: adding a prefilming agent OG-308A, a prefilming auxiliary agent OG-308B and a copper corrosion inhibitor OG-205 into the water system, and performing circulating prefilming for 48-60 hours.
8. The method for flushing and cleaning a prefilm in a blast furnace water system according to claim 7, wherein in S3, the water flow direction is the same as the water flow direction of the backflushing and cleaning.
9. The method for flushing and cleaning prefilm of a blast furnace water system according to claim 7, wherein S4 is performed after S3: replacing with desalted water, gradually replacing with desalted water with the supply capacity of about 50m & lt 3 & gt/h until the hardness of the system water is less than or equal to 15mg/L and the turbidity is less than or equal to 5NTU, adding a film protecting agent in the replacement process, and regulating the PH to be 8.0-10.0.
10. A method for flushing and cleaning prefilming in a blast furnace water system according to any one of claims 7 to 9, characterized in that a backflushing bypass is used as a blast furnace bypass, and carbon steel or stainless steel or copper hanging pieces are hung on the backflushing bypass to monitor prefilming effect of S3.
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