CN115584457A - Annular overflow device and method for closed-loop control of zinc addition through internal liquid level measurement - Google Patents
Annular overflow device and method for closed-loop control of zinc addition through internal liquid level measurement Download PDFInfo
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- 239000007788 liquid Substances 0.000 title claims abstract description 187
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 184
- 239000011701 zinc Substances 0.000 title claims abstract description 183
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 183
- 238000005259 measurement Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims abstract description 16
- 238000005086 pumping Methods 0.000 claims abstract description 8
- 238000005192 partition Methods 0.000 claims abstract description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 24
- 239000002893 slag Substances 0.000 claims description 12
- 239000011787 zinc oxide Substances 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000005246 galvanizing Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002547 anomalous effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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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
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
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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
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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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
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention provides an annular overflow device and method for closed-loop control of zinc addition through internal liquid level measurement, wherein the annular overflow device comprises an overflow groove, two liquid level wells and two zinc pumping pumps, two ends of the overflow groove are respectively provided with a partition plate and are divided into two independent overflow loops, the two liquid level wells are respectively arranged corresponding to an operation side and a transmission side of the overflow groove, a laser distance measuring sensor is arranged at the right upper end of each liquid level well, the two zinc pumping pumps are respectively communicated with the liquid level wells and the overflow loops at the corresponding sides through a Y-pipe, the influence of only zinc pot liquid level measurement in an annular overflow mode is eliminated through the liquid level measurement of the liquid level wells, and the zinc addition of the zinc level in the internal liquid level measurement is realized through the closed-loop control of the zinc level.
Description
Technical Field
The invention belongs to the technical field of hot galvanizing related equipment, and particularly relates to an annular overflow device and method for controlling zinc addition through internal liquid level measurement closed-loop.
Background
In a continuous hot galvanizing unit, zinc ash control is a key technology for controlling the surface quality of strip steel of a hot galvanizing unit, and particularly the difficulty that the zinc ash in a furnace nose is a long-term trouble to the hot galvanizing unit is solved. Inside the furnace nose, a ZnO film is formed on the zinc liquid surface by controlling the dew point inside the furnace nose to suppress the generation rate of zinc vapor on the zinc liquid surface. The ZnO film is thickened and can be attached to the surface of the strip steel, so that quality influence is caused. At present, a method adopted by a part of hot galvanizing units is to design an overflow structure in a furnace nose, so that a zinc liquid surface continuously overflows and enters an independent overflow groove structure, zinc liquid drives a ZnO film on the surface of the zinc liquid to enter the overflow groove at the same time, and the zinc liquid overflowing into the zinc pot is discharged into the zinc pot again through a zinc pump, so that the ZnO film on the zinc liquid surface in the furnace nose is continuously generated and eliminated, and the quality influence of zinc ash of the ZnO film on the surface of strip steel is effectively reduced.
In the process, the stability of the zinc liquid level is crucial to the control of zinc ash on a ZnO film of the zinc liquid level, the zinc liquid level in a zinc pot is required to be higher than the horizontal plane of an overflow lip, and a relatively constant overflow height needs to be kept, so that the uniform and stable overflow is realized, and the overflow height of the zinc liquid level can be influenced even if the liquid level of the zinc pot fluctuates by 0.1 mm. Because the galvanizing process is a process of continuously consuming zinc in the zinc liquid and supplementing the zinc liquid by adding zinc ingots, the consumption degree of the zinc liquid needs to be continuously and accurately obtained, and the zinc ingots with the same quantity are timely added to maintain the stability of the zinc liquid level.
The annular overflow carries out overall overflow on the zinc liquid surface of the peripheral area of the strip steel, the liquidity of the zinc liquid is better, the ash discharge effect is also better, the annular overflow generally adopts a split structure, a tundish is connected to the lower part of a furnace nose, the tundish is of a cofferdam structure formed by thin plates and used for isolating the inner liquid surface and the outer liquid surface of a zinc pot, the strip steel passes through the tundish, the zinc liquid in the zinc pot in the furnace nose can overflow into the annular overflow groove and is discharged into the zinc liquid outside the furnace nose by a zinc pump. And measuring the zinc liquid level of the zinc pot outside the furnace nose.
At present zinc pot liquid level's control, the long distance laser range finder who generally all adopts detects the outer zinc pot liquid level height of stove nose, then the rhythm of adding the zinc ingot is controlled through the altitude value that detects, thereby realize zinc pot zinc liquid's stable control, but such measurement mode, on the one hand receive zinc liquid surface thickness inequality easily, the influence of the anomalous dross of motion state, on the other hand zinc liquid level also can receive the influence that goes out zinc pot belted steel shake to have the height to vibrate, all can cause the liquid level detection undulant frequent zinc or not add zinc that leads to, thereby lead to the unusual fluctuation of zinc liquid level. Chinese utility model patent CN208183053 "slag discharge type furnace nose device with zinc liquid level control function" provides a slag discharge type furnace nose with zinc liquid level control function, through install dross monitoring well and take out the zinc pump respectively in furnace nose both sides, overflow launder formation linker structure in dross detection well and the furnace nose, can effectively shield all kinds of negative effects that fall the outer zinc pot zinc liquid level of furnace nose, but this kind of structure can only carry out the overflow to the zinc liquid level that the belted steel upper surface corresponds in the furnace nose, the zinc liquid level that the belted steel lower surface corresponds can't form the overflow, when defects such as lower surface zinc liquid level focus surface sediment, can't maintain high-quality zinc-plated product continuous production. The invention patent CN111893414A 'furnace nose annular overflow device for a hot coating plating production line' provides a herringbone overflow trough annular overflow structure, which has strong deformation resistance and good zinc liquid fluidity, but the overflow lips of the four overflow edges of the structure are all linear, and the whole level of the annular overflow surface is ensured in the processing and installation process, so the requirements on processing and installation are very high, and meanwhile, after the device is installed on line and immersed in zinc liquid, the device is tipped over under the influence of the buoyancy of the zinc liquid, and the levelness needs to be adjusted on line by depending on the experience of workers. Meanwhile, after the linear overflow lip is produced for a period of time, the lip condenses zinc dross and the height difference caused by thermal deformation can cause the overflow uniformity to be greatly reduced. The zinc liquid level measurement mode is the measurement of a zinc liquid level laser liquid level meter outside a furnace nose, the actual tiny fluctuation of the zinc liquid level of a main boiler is difficult to accurately estimate, and ingot adding cannot be accurately controlled to maintain the stability of the zinc liquid.
Disclosure of Invention
The invention aims to solve the technical problems and provides an annular overflow device and method for controlling zinc addition through inner liquid level measurement closed-loop control, which are used for realizing inner liquid level closed-loop control and simultaneously ensuring the smoothness of annular overflow and the stability of liquid level.
The technical scheme adopted by the invention for solving the technical problems is as follows: the annular overflow device is characterized by comprising an overflow tank, two liquid level wells and two zinc pumping pumps, wherein two ends of the overflow tank are respectively provided with a partition board and are separated into two independent overflow loops, the two liquid level wells are respectively arranged corresponding to the operation side and the transmission side of the overflow tank, a laser ranging sensor is arranged right above the liquid level wells, the number of the zinc pumping pumps is two, and each zinc pumping pump is communicated with the liquid level well and the overflow loop on the corresponding side through a Y-pipe.
According to the scheme, the overflow groove is of a zigzag annular groove structure formed by assembling an outer peripheral plate, an inner slag baffle and a bottom plate, the outer peripheral plate and the inner slag baffle respectively comprise two long plates and two short plates, the partition plate is arranged at one end of each short plate, and the pipe orifice of the Y-shaped pipe communicated with the overflow loop is arranged at one end of each short plate and is close to the partition plate on the corresponding side.
According to the scheme, the bottom plates of the two overflow loops are obliquely arranged, and the pipe openings of the Y-shaped pipes are located at the lowest point of the bottom plates.
According to the scheme, the top edge of the inner slag baffle is of a wave-shaped structure, and wave-shaped middle lines at two ends are lower than the wave-shaped middle line in the middle to form a wave-shaped lip.
According to the scheme, the liquid level well is of a rectangular box body structure with an open top, and the center of the bottom of the liquid level well is communicated with the pipe orifice of the Y-shaped pipe.
According to the scheme, the inlet of the zinc pump is communicated with the pipe orifice of the Y-pipe, the outlet of the zinc pump is connected with the buffer, the buffer is of an isosceles trapezoid shell structure with an opening at the bottom, the center of the top of the buffer is communicated with the zinc pump, buffer plates are arranged in the cavity inside the buffer at intervals, and two sides of each buffer plate are respectively connected with two side walls of the buffer.
According to the scheme, the buffer plate is a V-shaped bending plate.
According to the scheme, the central line of the wavy lip is three sections of horizontal lines with two low ends and a high middle or an arc line protruding upwards.
A control method of an annular overflow device for closed-loop control of zinc addition through internal liquid level measurement is characterized by comprising the following steps:
s1) after the maintenance operation is finished, installing an annular overflow device, firstly, installing and adjusting the levelness through a level meter, and lifting a zinc pot to immerse an annular overflow groove into zinc liquid along with the furnace nose tip;
s2) after the annular overflow groove is soaked in zinc liquid, the upper surface, the lower surface, the lip of the operation side and the lip of the transmission side are slightly tipped under the influence of the buoyancy of the zinc liquid, the exposed heights of the lip of the operation side and the lip of the transmission side are observed through a manhole of a furnace nose to adjust the horizontal flatness, and the unit normally operates after adjustment;
s3) in the operation process, the zinc pump starts to work, so that a liquid level difference is generated between the inner part of the annular overflow groove and an external zinc pot, zinc liquid with a zinc oxide film continuously flows into the overflow groove from the wavy lip, the zinc oxide film covers the upper part of the zinc liquid surface of the overflow groove to inhibit the evaporation of the zinc liquid in the overflow groove, the zinc liquid in the overflow groove is discharged into the zinc pot after passing through a buffer at the outlet of the zinc pump, and when the flow of the flowing zinc liquid is consistent with that of the pumped zinc liquid, the zinc liquid level in the overflow groove is kept constant;
and S4) measuring the liquid level height of the zinc liquid in the overflow groove according to a certain frequency through the laser distance sensors at the upper ends of the liquid level wells at the operation side and the transmission side, acquiring the fluctuation condition of the liquid level height, selecting a liquid level height measured value at one side of the liquid level height to compare with a target value, performing zinc liquid ingot adding closed-loop control according to comparison logic, adding zinc ingots when the zinc liquid height is lower than the target value, and stopping adding the zinc ingots when the zinc liquid height is higher than the target value.
According to the above scheme, the adjustment of the horizontal flatness in step S2 includes the following steps: the liquid level heights of the liquid level wells on the operation side and the transmission side respectively correspond to the liquid level heights of the two overflow loops, firstly, the lip of the overflow groove is lifted away from the zinc liquid level through the furnace retraction nose, a zinc pump is started to pump and empty the zinc liquid in the overflow groove, the rotating speed is kept constant, then, the furnace retraction nose is slowly extended out of the furnace to observe the measurement value of the laser liquid level meter, the side with the relatively lower lip is firstly found out when the liquid level changes, the zinc liquid starts to overflow into the overflow groove, at the moment, the furnace retraction nose is stopped to lift, the side overflow is stopped, then, the furnace retraction is continued to be extended out of the furnace to form overflow, the operation is repeated until the laser liquid level meters on the two sides simultaneously change in reading, the two overflow loops simultaneously overflow, and at the moment, the lip levelness is leveled.
The invention has the beneficial effects that: the annular overflow device and the method for closed-loop control of zinc addition through internal liquid level measurement are provided, a communicator formed by a liquid level well and an overflow groove is utilized, the fluctuation of the liquid level of a main pot is amplified (the area of the overflow groove is far smaller than that of a zinc pot, when the liquid level of zinc rises or falls, the liquid level overflowing into the overflow groove is rapidly increased or reduced, the rising or falling amplitude of the liquid level height in the overflow groove is far higher than that of the zinc pot), the influence of only zinc pot liquid level measurement in an annular overflow mode is eliminated, and the zinc liquid level closed-loop control of the internal liquid level measurement is realized; by improving the overflow lip, unsmooth overflow caused by high-temperature deformation, slag bonding and other problems of the flat lip is effectively avoided; meanwhile, the zinc liquid discharged by the zinc pump can reduce the disturbance of the external zinc liquid level through the buffer device, and the influence of zinc ash on the surface of the strip steel is effectively reduced; through the measurement of the liquid level well, a basis can be provided for the adjustment of the levelness on line.
Drawings
FIG. 1 is a schematic view of an annular overflow device according to one embodiment of the present invention.
Fig. 2 is a schematic view of the bottom structure of an annular overflow device according to an embodiment of the invention.
FIG. 3 is a top view of an annular overflow of one embodiment of the present invention.
FIG. 4 is an interior view of a bumper according to one embodiment of the present invention.
Fig. 5a and 5b are schematic views of two forms of the wavy lip of one embodiment of the invention.
Detailed Description
For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.
As shown in fig. 1-3, an annular overflow device for closed-loop control of zinc addition through internal liquid level measurement comprises an overflow tank 1, a liquid level well 2 and a zinc pump 3, wherein the zinc pump is installed through a fixing frame 4, two ends of the overflow tank are respectively provided with a partition plate 5 which is divided into two independent overflow loops, the two liquid level wells are respectively arranged corresponding to an operation side and a transmission side of the overflow tank, a laser distance measuring sensor is arranged right above the corresponding liquid level well, the two zinc pumps are respectively communicated with the liquid level well and the overflow loop on the corresponding side through a Y-pipe 6, and each liquid level well and the overflow tank form a communicating vessel structure.
The overflow launder is assembled into back style of calligraphy ring channel structure by outer surrounding plate 7, interior slag trap 8 and bottom plate 9, and outer surrounding plate and interior slag trap all include two long slabs and two short slabs, and the short slab one end is located to the baffle, and the nozzle that the Y-pipe is linked together with the overflow return circuit is located short slab one end, is close to the baffle that corresponds the side.
The bottom plates of the two overflow loops are all obliquely arranged, and the pipe orifices of the Y-shaped pipes are located at the lowest point of the bottom plates.
The top edge of the inner slag baffle is of a wave-shaped structure, and wave-shaped middle lines at two ends are lower than the middle wave-shaped middle line to form a wave-shaped lip 10.
The liquid level well is of a rectangular box body structure with an opening at the top, and the center of the bottom of the liquid level well is communicated with the pipe orifice of the Y-shaped pipe.
The inlet of the zinc pump is communicated with the pipe orifice of the Y-pipe, the outlet is connected with a buffer 11 (see figure 4), the buffer is of an isosceles trapezoid shell structure with an opening at the bottom, the center of the top is communicated with the zinc pump, buffer plates 12 are arranged in the cavity inside the buffer at intervals, and the two sides of each buffer plate are respectively connected with the two side walls of the buffer. The buffer plate can be a V-shaped bending plate, and the zinc liquid flows through the buffer and is blocked and buffered by the buffer plate.
The midline 13 of the wavy lip is a three-segment horizontal line with two lower ends and a higher middle (see fig. 5 a) or an upward convex arc line (see fig. 5 b).
The method for performing inner liquid level measurement closed-loop control zinc adding by adopting the device comprises the following steps:
(1) After the maintenance operation is completed, the annular overflow device is installed, the levelness is installed and adjusted through the level gauge, and the zinc pot is lifted to immerse the annular overflow groove into zinc liquid along with the furnace nose tip.
(2) After the annular overflow groove is soaked in zinc liquid, lips on the upper surface, the lower surface, the operation side and the transmission side slightly tip under the influence of buoyancy of the zinc liquid, the exposed heights of the lips on the operation side and the transmission side are observed through a manhole of a furnace nose, the horizontal flatness is adjusted, and the unit normally operates after adjustment.
(3) In the operation process, the zinc pump starts to work, so that a liquid level difference is generated between the inside of the annular overflow groove and an external zinc pot, zinc liquid with a zinc oxide film continuously flows into the overflow groove from the wavy lip, the zinc oxide film covers the upper part of the zinc liquid surface of the overflow groove to inhibit the evaporation of the zinc liquid in the overflow groove, the zinc liquid in the overflow groove is discharged into the zinc pot after passing through a buffer at the outlet of the zinc pump, and when the flow of the flowing zinc liquid is consistent with that of the pumped zinc liquid, the zinc liquid level in the overflow groove is kept constant.
(4) Measuring the liquid level height of zinc liquid in the overflow groove according to a certain frequency by laser distance sensors at the upper ends of the liquid level wells at the operation side and the transmission side, acquiring the fluctuation condition of the liquid level height, selecting a liquid level height measured value at one side of the liquid level height to compare with a target value, carrying out closed-loop control on zinc liquid ingot feeding according to comparison logic, feeding zinc ingots when the height of the zinc liquid is lower than the target value, and stopping feeding the zinc ingots when the height of the zinc liquid is higher than the target value.
The adjustment of the horizontal flatness comprises the following steps: the liquid level heights of the liquid level wells on the operation side and the transmission side respectively correspond to the liquid level heights of the two overflow loops, firstly, the lip of the overflow groove is lifted away from the zinc liquid level through the furnace retraction nose, a zinc pump is started to pump and empty the zinc liquid in the overflow groove, the rotating speed is kept constant, then, the furnace retraction nose is slowly extended out of the furnace to observe the measurement value of the laser liquid level meter, the side with the relatively lower lip is firstly found out when the liquid level changes, the zinc liquid starts to overflow into the overflow groove, at the moment, the furnace retraction nose is stopped to lift, the side overflow is stopped, then, the furnace retraction is continued to be extended out of the furnace to form overflow, the operation is repeated until the laser liquid level meters on the two sides simultaneously change in reading, the two overflow loops simultaneously overflow, and at the moment, the lip levelness is leveled.
The present invention is illustrated by the above examples, and is not limited to the embodiments of the present invention, and the structure, the position arrangement and the connection of the components may be changed. On the basis of the technical scheme of the invention, changes and equivalents of individual components according to the principle of the invention are not excluded from the protection scope of the invention.
Claims (10)
1. The annular overflow device is characterized by comprising an overflow tank, two liquid level wells and two zinc pumping pumps, wherein two ends of the overflow tank are respectively provided with a partition board and are separated into two independent overflow loops, the two liquid level wells are respectively arranged corresponding to the operation side and the transmission side of the overflow tank, a laser ranging sensor is arranged right above the liquid level wells, the number of the zinc pumping pumps is two, and each zinc pumping pump is communicated with the liquid level well and the overflow loop on the corresponding side through a Y-pipe.
2. The annular overflow device for closed-loop control of zincification by inner liquid level measurement according to claim 1, wherein the overflow groove is assembled into a zigzag annular groove structure by an outer peripheral plate, an inner slag baffle and a bottom plate, the outer peripheral plate and the inner slag baffle each comprise two long plates and two short plates, the baffle is arranged at one end of the short plate, and the pipe orifice of the Y-pipe communicated with the overflow loop is arranged at one end of the short plate and is close to the baffle at the corresponding side.
3. An annular overflow device for closed-loop control of zincification by internal level measurement according to claim 2, wherein the bottom plates of the two overflow circuits are arranged obliquely, and the pipe openings of the Y-shaped pipes are positioned at the lowest point of the bottom plates.
4. The annular overflow device for closed-loop control of zincification by inner liquid level measurement as claimed in claim 3, wherein the top edge of the inner slag trap is of a wave-shaped structure, and the wave-shaped middle line at two ends is lower than the wave-shaped middle line at the middle to form a wave-shaped lip.
5. The annular overflow device for closed-loop control of zincification by inner liquid level measurement according to claim 1 or 4, characterized in that the liquid level well is a rectangular box structure with an open top, and the bottom center is communicated with the nozzle of the Y-pipe.
6. The annular overflow device for closed-loop control of zinc addition through internal liquid level measurement according to claim 1 or 4, wherein an inlet of the zinc pump is communicated with a pipe orifice of the Y-pipe, an outlet of the zinc pump is connected with a buffer, the buffer is of an isosceles trapezoid shell structure with an opening at the bottom, the center of the top of the buffer is communicated with the zinc pump, a buffer plate is arranged in an inner cavity of the buffer at a spacing, and two sides of the buffer plate are respectively connected with two side walls of the buffer.
7. The annular overflow device for closed-loop control of zincification by internal liquid level measurement according to claim 6, wherein the buffer plate is a V-shaped bent plate.
8. The annular overflow device for controlling zincification by inner liquid level measurement closed loop according to the claim 4 or 7, characterized in that the midline of the wavy lip is three sections of horizontal line with two ends low and the middle high or an arc line convex upwards.
9. The control method for the annular overflow device for closed-loop control of zinc addition through internal liquid level measurement is characterized by comprising the following steps of:
s1) after the maintenance operation is finished, installing an annular overflow device, firstly, installing and adjusting the levelness through a level meter, and lifting a zinc pot to immerse an annular overflow groove into zinc liquid along with the furnace nose tip;
s2) after the annular overflow groove is soaked in zinc liquid, the lips on the upper surface, the lower surface, the operation side and the transmission side are slightly tipped under the influence of the buoyancy of the zinc liquid, the exposed heights of the lips on the operation side and the transmission side are observed through a manhole of a furnace nose to adjust the horizontal flatness, and the unit normally operates after adjustment;
s3) in the operation process, a zinc pump starts to work to enable the inner part of the annular overflow groove and an external zinc pot to generate liquid level difference, zinc liquid with a zinc oxide film continuously flows into the overflow groove from the wave-shaped lip, the zinc oxide film covers the upper part of the zinc liquid level of the overflow groove to inhibit the evaporation of the zinc liquid in the overflow groove, the zinc liquid of the overflow groove is discharged into the zinc pot after passing through a buffer at the outlet of the zinc pump, and when the flow of the flowing zinc liquid is consistent with that of the pumped zinc liquid, the zinc liquid level in the overflow groove is kept constant;
and S4) measuring the liquid level height of the zinc liquid in the overflow groove according to a certain frequency through laser distance sensors at the upper ends of the liquid level wells at the operation side and the transmission side, acquiring the fluctuation condition of the liquid level height, selecting a liquid level height measured value at one side of the liquid level height to compare with a target value, performing zinc liquid ingot adding closed-loop control according to comparison logic, adding zinc ingots when the height of the zinc liquid is lower than the target value, and stopping adding the zinc ingots when the height of the zinc liquid is higher than the target value.
10. The method for controlling an annular overflow device for zinc adding by internal level measurement closed-loop control according to claim 9, characterized in that the adjustment of the horizontal flatness in step S2 comprises the following steps: the liquid level heights of the liquid level wells on the operation side and the transmission side respectively correspond to the liquid level heights of the two overflow loops, firstly, the lip of the overflow groove is lifted away from the zinc liquid level through the furnace nose which is retracted, the zinc pump is started to pump and empty the zinc liquid in the overflow groove, the rotating speed is kept constant, then, the furnace nose is slowly extended out to observe the measurement value of the laser liquid level meter, the side with the relatively lower lip is firstly subjected to the liquid level change, the zinc liquid starts to overflow into the overflow groove, the furnace nose is stopped extending out at the moment, the furnace nose is adjusted to lift and rotate, the side overflow is stopped, then, the furnace nose is continuously extended out to form overflow, the operation is repeated until the laser liquid level meters on the two sides simultaneously undergo reading change, the two overflow loops are simultaneously subjected to overflow, and the level of the lip is leveled at the moment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211208732.0A CN115584457A (en) | 2022-09-30 | 2022-09-30 | Annular overflow device and method for closed-loop control of zinc addition through internal liquid level measurement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211208732.0A CN115584457A (en) | 2022-09-30 | 2022-09-30 | Annular overflow device and method for closed-loop control of zinc addition through internal liquid level measurement |
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| CN113637934A (en) * | 2021-07-22 | 2021-11-12 | 武汉钢铁有限公司 | Auxiliary device and method for manufacturing annular overflow furnace nose |
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| CN208183053U (en) * | 2018-04-24 | 2018-12-04 | 大连胜光科技发展有限公司 | Slagoff type furnace nose device with zinc Liquid level function |
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