CN105200498A - Method for controlling content of hydrogen in zinc dissolving tank for electro-galvanizing and zinc dissolving system - Google Patents
Method for controlling content of hydrogen in zinc dissolving tank for electro-galvanizing and zinc dissolving system Download PDFInfo
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- CN105200498A CN105200498A CN201510660240.9A CN201510660240A CN105200498A CN 105200498 A CN105200498 A CN 105200498A CN 201510660240 A CN201510660240 A CN 201510660240A CN 105200498 A CN105200498 A CN 105200498A
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Abstract
The invention relates to a method for controlling content of hydrogen in a zinc dissolving tank for electro-galvanizing, which comprises the following steps: arranging a hydrogen concentration detection instrument on a fog discharge pipeline connected to the zinc dissolving tank so as to monitor the hydrogen concentration in the zinc dissolving tank in real time; arranging a supporting plate with an inclined part in the zinc dissolving tank so as to be used for bearing zinc particles, and at least forming a plurality of through holes in the inclined part; when the hydrogen concentration reaches a first threshold, reducing the rotating speed of a zinc dissolving pump to the minimum, and starting a standby fan of a fog discharge system; and when the hydrogen concentration reaches a second threshold, enabling the zinc dissolving pump to stop working, and discharging the electroplating solution in the zinc dissolving tank to enable the liquid level in the zinc dissolving tank to be at least reduced to the position below the supporting plate, wherein the second threshold is greater than the first threshold. In addition, the invention also provides a zinc dissolving system which can implement the method. By adopting the control method and zinc dissolving system provided by the invention, the hydrogen concentration in the zinc dissolving tank is controllable, and the production safety and stability are effectively increased.
Description
Technical field
The invention belongs to cold rolled strip electro-galvanizing technical field, be specifically related to a kind ofly control the method for hydrogen content in electro-galvanizing zinc dissolving tank and a kind of molten Zn system.
Background technology
Electro-galvanizing is one of anticorrosion of iron and steel technology, and electrolytic galvanized sheet is widely used in the industries such as automobile, household electrical appliances, light industry because having good erosion resistance, processibility, weldability and japanning.Cold rolled strip continuous electroplating zinc service line grew up in the forties in 20th century, and existing more than 50 continuous electroplating zinc service line puts into production in the world so far, and service line speed reaches 210m/min, and maximum bandwidth reaches 2080mm.
Electro-galvanizing method the most frequently used is at present the gravity channel process of An Deli thatch company exploitation in 1985, and gravity method electro-galvanizing adopts soluble anode, Zn
2+supplemented by independent molten zinc device.Along with the carrying out of Electroplating Production, Zn
2+constantly from electroplate liquid, galvanic deposit is to belt steel surface in meeting, and needs constantly supplement zine ion in electroplate liquid, to ensure Zn
2+concentration, otherwise plating cannot be carried out, and is therefore provided with molten Zn system.
In molten Zn system electroplate liquid extracted out from circulation tank by molten zinc pump after from adverse current bottom molten zinc can by the zinc granule layer tank, zinc granule just with the H in electroplate liquid
+react and become Zn
2+enter in electroplate liquid, obtain and be rich in Zn
2+electroplate liquid after, overflow is to setting tank, and electroplate liquid after filtration relies on action of gravity to flow back into electroplate liquid circulation tank.Zinc particle in molten zinc groove can directly be supplemented by zinc particle loading hopper by top.In zinc dissolving station, reaction is shown below:
As can be seen from the above equation, zinc solubilizing reaction generates a large amount of hydrogen.Because the limits of explosion of hydrogen is 4% ~ 74.2%, belong to explosion hazard gases.For avoiding zinc dissolving station to blast, need the concentration controlling hydrogen in molten zinc can in time.
When density of hydrogen reaches certain value, wish that electroplate liquid is emptying as far as possible soon, to reduce amounts of hydrogen.But the mechanism form due to existing molten zinc can determines liquid in tank and zinc granule bump contact, therefore still have a large amount of hydrogen within a certain period of time to produce, therefore need the contradictory problems solving zinc granule and liquid comes into contact area, require that neither impact is normal and produce, be convenient to again emptying in time.
Therefore be necessary to design and a kind ofly control the method for hydrogen content in electro-galvanizing zinc dissolving tank and a kind of molten Zn system, to overcome the problems referred to above.
Summary of the invention
The object of the invention is to the defect overcoming prior art, provide and a kind ofly control the method for hydrogen content in electro-galvanizing zinc dissolving tank and a kind of molten Zn system, make density of hydrogen in molten zinc can controlled.
The present invention is achieved in that
The invention provides a kind of method controlling hydrogen content in electro-galvanizing zinc dissolving tank, the method is specially: being connected to the density of hydrogen fog discharge pipeline on molten zinc can arranged in the molten zinc can of Hydrogen Concentration Detector Real-Time Monitoring; In described molten zinc can, arrange the supporting plate that has rake, this supporting plate for carrying zinc particle, and offers multiple through hole to being less than on described rake, to make above electroplate liquid overflow to supporting plate with zinc particle reaction or to make electroplate liquid be back to below supporting plate; When described Hydrogen Concentration Detector detects that density of hydrogen reaches first threshold, the rotating speed of molten zinc pump is down to minimum, and the spare fans of fog discharge system starts; When described Hydrogen Concentration Detector detects that density of hydrogen reaches Second Threshold, molten zinc pump quits work, and electroplate liquid in the molten zinc can of outer row, make liquid level in molten zinc can at least be down to below described supporting plate; Described Second Threshold is greater than described first threshold.
Further, in parallelly between electroplate liquid circulation tank with molten zinc can bottom liquid inlet mouth be provided with electroplate liquid supply line and electroplate liquid return line, described molten zinc pump is located on described electroplate liquid supply line; When density of hydrogen reaches Second Threshold, the stopping valve be located on described electroplate liquid supply line is closed, the stopping valve be located on described electroplate liquid return line is opened, and the electroplate liquid in molten zinc can is back in described electroplate liquid circulation tank by described electroplate liquid return line.
Further, in molten zinc can electroplate liquid backflow emptying after, rinse the zinc particle in molten zinc can with de-salted water.
Further, the volume percent that described first threshold is specially hydrogen in fog is 1%, and the volume percent that described Second Threshold is specially hydrogen in fog is 2.5%.
Further, described supporting plate is taper supporting plate, and the perforate direction of each described through hole is vertical direction.
Further, described taper supporting plate is bilayer structure, comprise the first conical plate and the second conical plate, described second conical plate is positioned at above described first conical plate, described first conical plate and described second conical plate are equipped with multiple described through hole, and the described through hole on described first conical plate and the described through hole on described second conical plate misplace and arrange.
Further, described fog discharge pipeline is also provided with Hydrogen Concentration Detector for subsequent use.
The present invention also provides a kind of molten Zn system, comprise molten zinc can and electroplate liquid circulation tank, described molten zinc can top is connected with fog discharge pipeline, bottom is provided with fluid inlet, described fog discharge pipeline and acid mist purifying system connectivity, described fog discharge pipeline is provided with Hydrogen Concentration Detector, and described acid mist purifying system is provided with the spare fans for accident control; Described electroplate liquid circulation tank is in parallel with between described fluid inlet is provided with electroplate liquid supply line and electroplate liquid return line, and described electroplate liquid supply line and described electroplate liquid return line are equipped with stopping valve, and described electroplate liquid supply line is provided with molten zinc pump; Described molten Zn system also comprises central controller, described Hydrogen Concentration Detector is electrically connected with the input terminus of described central controller, and pull up circuit and each described stopping valve of described molten zinc pump and described spare fans are all electrically connected with the output terminal of described central controller; Be provided with the supporting plate for carrying zinc particle in described molten zinc can, this supporting plate has rake, and offers multiple through hole to being less than on described rake.
Further, described supporting plate is taper supporting plate, and the perforate direction of each described through hole is vertical direction.
Further, described taper supporting plate is bilayer structure, comprise the first conical plate and the second conical plate, described second conical plate is positioned at above described first conical plate, described first conical plate and described second conical plate are equipped with multiple described through hole, and the described through hole on described first conical plate and the described through hole on described second conical plate misplace and arrange.
Further, described molten zinc can top is socketed with annular overflow trough, and described annular overflow trough top is provided with at least one de-salted water entrance, and each described de-salted water entrance is all connected with de-salted water pipeline, is provided with evacuation port bottom described annular overflow trough.
The present invention has following beneficial effect: in method provided by the invention, by arranging the density of hydrogen in the molten zinc can of Hydrogen Concentration Detector Real-Time Monitoring, the working speed of molten zinc pump is controlled by detected value, when density of hydrogen reaches first threshold, molten zinc revolution speed is down to minimum, the electroplate liquid entered in molten zinc can is reduced, thus reduces hydrogen generating quantity.When density of hydrogen reaches Second Threshold, molten zinc pump quits work, and electroplate liquid in the molten zinc can of outer row, under the effect of supporting plate rake, electroplate liquid and zinc particle are isolated fast, thus density of hydrogen in molten zinc can is reduced fast, ensure safety in production.
The present invention also has following beneficial effect: in molten Zn system provided by the invention, by arranging the density of hydrogen in the molten zinc can of Hydrogen Concentration Detector Real-Time Monitoring, the working speed of molten zinc pump is controlled by detected value, when density of hydrogen is larger, when needing timely stopped reaction, molten zinc pump can be controlled in time and reduce rotating speed until quit work, reduce the electroplate liquid liquid inlet volume in molten zinc can, thus reduce hydrogen generating quantity.Can be arranged the electroplate liquid in molten zinc can fast outward by electroplate liquid return line, under the effect of supporting plate rake, electroplate liquid and zinc particle are isolated fast, thus density of hydrogen in molten zinc can is reduced fast, ensure safety in production.This molten Zn system density of hydrogen is controlled, effectively improves production security and stability.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of the molten Zn system that Fig. 1 provides for the embodiment of the present invention;
The structural representation of the molten zinc can that Fig. 2 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, other embodiments all that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belong to the scope of protection of the invention.
Embodiment one
As Fig. 1, the embodiment of the present invention provides a kind of method controlling hydrogen content in electro-galvanizing zinc dissolving tank, and the method is specially: being connected to the density of hydrogen fog discharge pipeline on molten zinc can 5 arranged in the molten zinc can 5 of Hydrogen Concentration Detector 7 Real-Time Monitoring; In described molten zinc can 5, the supporting plate 52 that has rake is set, this supporting plate 52 is for carrying zinc particle, and offer multiple through hole to being less than on described rake, to make above electroplate liquid overflow to supporting plate 52 with zinc particle reaction or to make electroplate liquid be back to below supporting plate 52.Space in molten zinc can 5 should be divided into upper and lower two portions by this supporting plate 52, and zinc particle enters in molten zinc can 5 from molten zinc can 5 top feeding, is held stay in upper space by supporting plate 52; During normal production, control molten zinc pump 2 power according to the detected value of Hydrogen Concentration Detector 7, electroplate liquid enters in molten zinc can 5 bottom molten zinc can 5, and in lower space, liquid level rises gradually and enters upper space and zinc particle reaction by the through hole on supporting plate 52.Due in lower space without zinc particle, the flowing of the electroplate liquid that newly enters is easier; Rake supporting plate 52 makes the contact area of zinc particle and electroplate liquid larger, is easier to reaction.
When described Hydrogen Concentration Detector 7 detects that density of hydrogen reaches first threshold, the rotating speed of molten zinc pump 2 is down to minimum, and the spare fans of fog discharge system starts; When described Hydrogen Concentration Detector 7 detects that density of hydrogen reaches Second Threshold, molten zinc pump 2 quits work, and electroplate liquid in the molten zinc can 5 of outer row, make liquid level in molten zinc can 5 at least be down to described supporting plate less than 52; Described Second Threshold is greater than described first threshold.Particularly, described first threshold is the volume percent of hydrogen in fog is 1%, and described Second Threshold is the volume percent of hydrogen in fog is 2.5%.The mode that in molten zinc can 5, electroplate liquid is arranged outward can directly outer drain into waste effluent flume (can bottom molten zinc can 5 or lower sidewall arrange one outside arrange mouth, this outer Pai Kou position is lower than the lower-most point of supporting plate 52); Or in the following way: in parallelly between electroplate liquid circulation tank 1 with molten zinc can 5 bottom liquid inlet mouth be provided with electroplate liquid supply line (not indicating in Fig. 1) and electroplate liquid return line (not indicating in Fig. 1), electroplate liquid supply line and electroplate liquid return line are equipped with stopping valve 3, and described molten zinc pump 2 is located on described electroplate liquid supply line.When in molten zinc can 5, density of hydrogen is below Second Threshold, the stopping valve 3 be located on electroplate liquid return line is closed, and the stopping valve 3 be located on electroplate liquid supply line is opened, and molten zinc pump 2 works and constantly in molten zinc can 5, provides electroplate liquid; When in molten zinc can 5, density of hydrogen reaches Second Threshold, the stopping valve 3 be located on described electroplate liquid supply line is closed, the stopping valve 3 be located on described electroplate liquid return line is opened, and the electroplate liquid in molten zinc can 5 is back in described electroplate liquid circulation tank 1 by described electroplate liquid return line.Under the effect of supporting plate 52 rake, be drained through in journey outside electroplate liquid, electroplate liquid and zinc particle can be isolated fast, thus density of hydrogen in molten zinc can 5 is reduced fast, ensure safety in production.For improving the stability of system cloud gray model, described fog discharge pipeline is also provided with Hydrogen Concentration Detector 8 for subsequent use, and when preventing from only having a Hydrogen Concentration Detector 7 and breaking down, system can not detect density of hydrogen and form potential safety hazard.In the molten zinc can of control in the present embodiment 5, the mode of density of hydrogen is automatic control, and namely the pull up circuit etc. of each Hydrogen Concentration Detector 7, molten zinc pump 2, each stopping valve 3 and stand-by fan is all electrically connected with electro-galvanizing Workshop control system.
Above-mentioned supporting plate 52 can be a flat board, this flat board is inclined and mounted in molten zinc can 5, thus separated by spaces in molten zinc can 5 is become upper and lower two portions space, or comprises a leveling board and a tilted plate, tilted plate evenly arranges multiple through hole, leveling board can be established or through hole is not set; And other similar structures.As shown in Figure 2, for improving the isolation speed of electroplate liquid and zinc particle when electroplate liquid is arranged further outward, this supporting plate 52 preferably adopts up-narrow and down-wide taper supporting plate 52(also can adopt back taper supporting plate 52 wide at the top and narrow at the bottom), the bottom margin of this taper supporting plate 52 is fixed on molten zinc can 5 inwall, and the horizontal section of this taper supporting plate 52 can be taper shape or Polygons.Taper supporting plate 52 effectively can increase the area of rake, and make the contact area of zinc particle and electroplate liquid larger on the one hand, when being easier to normally produce, the reaction of zinc particle and electroplate liquid, enhances productivity; On the other hand, when also making electroplate liquid arrange outward, electroplate liquid and zinc particle are isolated more fast.Further, the perforate direction of each described through hole is vertical direction, improves the speed of electroplate liquid from supporting plate 52 underflow.The aperture of each through hole is set to about 2mm or less, can prevent when electroplate liquid is arranged outward, is partly dissolved zinc particle that rear particle diameter diminishes and falls into lower space and continue to react with electroplate liquid, can reduce the generation of hydrogen further.
As Fig. 1-Fig. 2, the structure of the above-mentioned supporting plate 52 of further optimization, described taper supporting plate 52 is bilayer structure, comprise the first conical plate and the second conical plate, described second conical plate is positioned at above described first conical plate, described first conical plate and described second conical plate are equipped with multiple described through hole, and the described through hole on described first conical plate and the described through hole on described second conical plate misplace and arrange.Through hole on first conical plate and the second conical plate misplaces and arranges, when the zinc grain diameter that the second conical plate carries diminish and from through hole vertical drop the second conical plate time, first conical plate can block this zinc particle, thus reduces the probability that zinc particle falls into lower space.The through-hole aperture that can arrange on the second conical plate is a bit larger tham the through-hole aperture on the first conical plate further, to improve electroplate liquid and the contact area being positioned at the zinc particle on the second conical plate.
As preferably, in molten zinc can 5 electroplate liquid backflow emptying after, rinse the zinc particle in molten zinc can 5 with de-salted water, to remove the residual electroplate liquid of zinc particle surface, continue to react with electroplate liquid to prevent zinc particle to produce hydrogen.Specific implementation method is for be provided with de-salted water spraying mechanism at molten zinc can 5 top, this de-salted water spraying mechanism is specially: be provided with at least one de-salted water entrance 56 at annular overflow trough 53 top, each described de-salted water entrance 56 is all connected with de-salted water pipeline, is provided with evacuation port 58 bottom described annular overflow trough 53.Each described de-salted water pipeline is communicated with desalination water pot 6 by de-salted water supply main line, and described de-salted water supply main line is provided with stopping valve 3; Stopping valve 3 on this de-salted water supply main line is electrically connected with the output terminal of described central controller.When in molten zinc can 5, density of hydrogen reaches Second Threshold, the molten zinc pump 2 of central controller controls quit work and electroplate liquid return line open time, in molten zinc can 5, electroplate liquid is drained gradually; After emptying, stopping valve 3 on electroplate liquid supply line and electroplate liquid return line is all closed, leakage fluid dram on annular overflow trough 53 is closed, stopping valve 3 on de-salted water supply main line is opened, de-salted water enters in annular overflow trough 53 and gradually in overflow to molten zinc can 5, de-salted water rinses zinc particle thus removes the electroplate liquid of zinc particle surface.After returning to normal production, enter bottom electroplate liquid self-dissolving zinc can 5, make the de-salted water in molten zinc can 5 overflow back in annular overflow trough 53, open the evacuation port 58 on annular overflow trough 53, de-salted water can be made to discharge molten zinc can 5.
Embodiment two
As Fig. 1-Fig. 2, the embodiment of the present invention also provides a kind of molten Zn system, comprise molten zinc can 5, electroplate liquid circulation tank 1 and electroplate liquid setting tank 4, fluid inlet 51 is provided with bottom molten zinc can 5, open top is also socketed with annular overflow trough 53, on this annular overflow trough 53, (bottom or sidewall) offers leakage fluid dram 57, the inlet end of electroplate liquid setting tank 4 is communicated with this leakage fluid dram 57, the exit end of electroplate liquid setting tank 4 is communicated with the inlet end of electroplate liquid circulation tank 1, in parallelly between electroplate liquid circulation tank 1 exit end with described fluid inlet 51 be provided with electroplate liquid supply line and electroplate liquid return line, electroplate liquid supply line and described electroplate liquid return line are equipped with stopping valve 3, electroplate liquid supply line is provided with molten zinc pump 2.Arrange the fog discharge air port 55 raised up at the top of annular overflow trough 53, this fog discharge air port 55 is connected with fog discharge pipeline, fog discharge pipeline and acid mist purifying system connectivity; Circular hole is offered at the middle part in annular overflow trough 53, fog discharge air port 55, and the bottom cylinder of dress zinc funnel 54, through the circular hole in the middle part of annular overflow trough 53, fog discharge air port 55, extend in molten zinc can 5.During actual production, sink down in molten zinc can 5 in zinc particle loading dress zinc funnel 54; Molten zinc pump 2 works, and now, the stopping valve 3 on electroplate liquid supply line is opened, and the stopping valve 3 on electroplate liquid return line is closed, electroplate liquid enter bottom molten zinc can 5 and with zinc particle reaction, dissolve in Zn
2+ion, along with liquid level continues to rise, the electroplate liquid after dissolving is spilled in annular diversion trench from top, then flows in electroplate liquid setting tank 4; Electroplate liquid after filtration relies on action of gravity to be back in electroplate liquid circulation tank 1, so circulates, until electroplate liquid reaches requirement.
Because zinc solubilizing reaction can generate hydrogen, in order to prevent in molten zinc can 5, density of hydrogen is excessive blasts, and need control the hydrogen content in molten zinc can 5, and control method adopts the method for hydrogen content in the control electro-galvanizing zinc dissolving tank 5 described in embodiment one.In this molten Zn system, following structure can be adopted to implement aforesaid method: described fog discharge pipeline is provided with Hydrogen Concentration Detector 7, and described acid mist purifying system is provided with the spare fans for accident control; Described molten Zn system also comprises central controller, described Hydrogen Concentration Detector 7 is electrically connected with the input terminus of described central controller, and pull up circuit and each described stopping valve 3 of described molten zinc pump 2 and described spare fans are all electrically connected with the output terminal of described central controller; Be provided with the supporting plate 52 for carrying zinc particle in described molten zinc can 5, this supporting plate 52 has rake, and offers multiple through hole to being less than on described rake.Above-mentioned central controller adopts the central processing unit of electro-galvanizing Workshop control system nearby, without the need to other setting, and without the need to extra programming.
As Fig. 1-Fig. 2, above-mentioned supporting plate 52 is optimized: above-mentioned supporting plate 52 can be a flat board, this flat board is inclined and mounted in molten zinc can 5, thus separated by spaces in molten zinc can 5 is become upper and lower two portions space, or comprise a leveling board and a tilted plate, tilted plate evenly arranges multiple through hole, leveling board can be established or through hole is not set; And other similar structures.For improving the isolation speed of electroplate liquid and zinc particle when electroplate liquid is arranged further outward, this supporting plate 52 preferably adopts up-narrow and down-wide taper supporting plate 52(also can adopt back taper supporting plate 52 wide at the top and narrow at the bottom), the bottom margin of this taper supporting plate 52 is fixed on molten zinc can 5 inwall, and the horizontal section of this taper supporting plate 52 can be taper shape or Polygons.Under the shunting action at this taper supporting plate 52 top, zinc particle is almost distributed on supporting plate 52 above until be filled into certain altitude, then zinc particles plug funnel straight tube.Taper supporting plate 52 effectively can increase the area of rake, and make the contact area of zinc particle and electroplate liquid larger on the one hand, when being easier to normally produce, the reaction of zinc particle and electroplate liquid, enhances productivity; On the other hand, when also making electroplate liquid arrange outward, electroplate liquid and zinc particle are isolated more fast.Further, the perforate direction of each described through hole is vertical direction, improves the speed of electroplate liquid from supporting plate 52 underflow.The aperture of each through hole is set to about 2mm or less, can prevent when electroplate liquid is arranged outward, is partly dissolved zinc particle that rear particle diameter diminishes and falls into lower space and continue to react with electroplate liquid, can reduce the generation of hydrogen further.
As Fig. 2, the structure of the above-mentioned supporting plate 52 of further optimization, described taper supporting plate 52 is bilayer structure, comprise the first conical plate and the second conical plate, described second conical plate is positioned at above described first conical plate, described first conical plate and described second conical plate are equipped with multiple described through hole, and the described through hole on described first conical plate and the described through hole on described second conical plate misplace and arrange.Through hole on first conical plate and the second conical plate misplaces and arranges, when the zinc grain diameter that the second conical plate carries diminish and from through hole vertical drop the second conical plate time, first conical plate can block this zinc particle, thus reduces the probability that zinc particle falls into lower space.The through-hole aperture that can arrange on the second conical plate is a bit larger tham the through-hole aperture on the first conical plate further, to improve electroplate liquid and the contact area being positioned at the zinc particle on the second conical plate.
As a kind of preferred structure of the present embodiment, described molten zinc can 5 top is provided with de-salted water spraying mechanism, after emptying for the backflow of electroplate liquid in molten zinc can 5, the zinc particle in molten zinc can 5 is rinsed with de-salted water, to remove the residual electroplate liquid of zinc particle surface, continue to react with electroplate liquid to prevent zinc particle to produce hydrogen.This de-salted water spraying mechanism is specially: be provided with at least one de-salted water entrance 56 at annular overflow trough 53 top, and each described de-salted water entrance 56 is all connected with de-salted water pipeline, is provided with evacuation port 58 bottom described annular overflow trough 53.Each described de-salted water pipeline is communicated with desalination water pot 6 by de-salted water supply main line, and described de-salted water supply main line is provided with stopping valve 3; Stopping valve 3 on this de-salted water supply main line is electrically connected with the output terminal of described central controller.When in molten zinc can 5, density of hydrogen reaches Second Threshold, the molten zinc pump 2 of central controller controls quit work and electroplate liquid return line open time, in molten zinc can 5, electroplate liquid is drained gradually; After emptying, stopping valve 3 on electroplate liquid supply line and electroplate liquid return line is all closed, leakage fluid dram 57 on annular overflow trough 53 is closed, stopping valve 3 on de-salted water supply main line is opened, de-salted water enters in annular overflow trough 53 and gradually in overflow to molten zinc can 5, de-salted water rinses zinc particle thus removes the electroplate liquid of zinc particle surface.After returning to normal production, enter bottom electroplate liquid self-dissolving zinc can 5, make the de-salted water in molten zinc can 5 overflow back in annular overflow trough 53, open the evacuation port 58 on annular overflow trough 53, de-salted water can be made to discharge molten zinc can 5.
In addition, as preferably, fog discharge pipeline is also provided with Hydrogen Concentration Detector 8 for subsequent use, when preventing from only having a Hydrogen Concentration Detector 7 and breaking down, system can not detect density of hydrogen and form potential safety hazard.Described molten zinc can 5 also offers inspection manhole 59, and this inspection manhole 59 can be located in the middle part of molten zinc can 5.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. control a method for hydrogen content in electro-galvanizing zinc dissolving tank, it is characterized in that: being connected to the density of hydrogen fog discharge pipeline on molten zinc can arranged in the molten zinc can of Hydrogen Concentration Detector Real-Time Monitoring; In described molten zinc can, arrange the supporting plate that has rake, this supporting plate for carrying zinc particle, and offers multiple through hole to being less than on described rake, to make above electroplate liquid overflow to supporting plate with zinc particle reaction or to make electroplate liquid be back to below supporting plate; When described Hydrogen Concentration Detector detects that density of hydrogen reaches first threshold, the rotating speed of molten zinc pump is down to minimum, and the spare fans of fog discharge system starts; When described Hydrogen Concentration Detector detects that density of hydrogen reaches Second Threshold, molten zinc pump quits work, and electroplate liquid in the molten zinc can of outer row, make liquid level in molten zinc can at least be down to below described supporting plate; Described Second Threshold is greater than described first threshold.
2. the method for hydrogen content in control electro-galvanizing zinc dissolving tank according to claim 1, it is characterized in that: in parallelly between electroplate liquid circulation tank with molten zinc can bottom liquid inlet mouth be provided with electroplate liquid supply line and electroplate liquid return line, described molten zinc pump is located on described electroplate liquid supply line; When in molten zinc can, density of hydrogen reaches Second Threshold, the stopping valve be located on described electroplate liquid supply line is closed, the stopping valve be located on described electroplate liquid return line is opened, and the electroplate liquid in molten zinc can is back in described electroplate liquid circulation tank by described electroplate liquid return line.
3. the method for hydrogen content in control electro-galvanizing zinc dissolving tank according to claim 2, is characterized in that: in molten zinc can electroplate liquid backflow emptying after, rinse the zinc particle in molten zinc can with de-salted water.
4. the method for hydrogen content in control electro-galvanizing zinc dissolving tank according to claim 1, it is characterized in that: the volume percent that described first threshold is specially hydrogen in fog is 1%, the volume percent that described Second Threshold is specially hydrogen in fog is 2.5%.
5. the method for hydrogen content in control electro-galvanizing zinc dissolving tank according to any one of claim 1 to 4, it is characterized in that: described supporting plate is taper supporting plate, the perforate direction of each described through hole is vertical direction.
6. the method for hydrogen content in control electro-galvanizing zinc dissolving tank according to claim 5, it is characterized in that: described taper supporting plate is bilayer structure, comprise the first conical plate and the second conical plate, described second conical plate is positioned at above described first conical plate, described first conical plate and described second conical plate are equipped with multiple described through hole, and the described through hole on described first conical plate and the described through hole on described second conical plate misplace and arrange.
7. a molten Zn system, comprise molten zinc can and electroplate liquid circulation tank, described molten zinc can top is connected with fog discharge pipeline, bottom is provided with fluid inlet, described fog discharge pipeline and acid mist purifying system connectivity, it is characterized in that: described fog discharge pipeline is provided with Hydrogen Concentration Detector, described acid mist purifying system is provided with the spare fans for accident control; Described electroplate liquid circulation tank is in parallel with between described fluid inlet is provided with electroplate liquid supply line and electroplate liquid return line, and described electroplate liquid supply line and described electroplate liquid return line are equipped with stopping valve, and described electroplate liquid supply line is provided with molten zinc pump; Described molten Zn system also comprises central controller, described Hydrogen Concentration Detector is electrically connected with the input terminus of described central controller, and pull up circuit and each described stopping valve of described molten zinc pump and described spare fans are all electrically connected with the output terminal of described central controller; Be provided with the supporting plate for carrying zinc particle in described molten zinc can, this supporting plate has rake, and offers multiple through hole to being less than on described rake.
8. molten Zn system according to claim 7, is characterized in that: described supporting plate is taper supporting plate, and the perforate direction of each described through hole is vertical direction.
9. molten Zn system according to claim 8, it is characterized in that: described taper supporting plate is bilayer structure, comprise the first conical plate and the second conical plate, described second conical plate is positioned at above described first conical plate, described first conical plate and described second conical plate are equipped with multiple described through hole, and the described through hole on described first conical plate and the described through hole on described second conical plate misplace and arrange.
10. the molten Zn system according to any one of claim 7 to 9, it is characterized in that: described molten zinc can top is socketed with annular overflow trough, described annular overflow trough top is provided with at least one de-salted water entrance, each described de-salted water entrance is all connected with de-salted water pipeline, is provided with evacuation port bottom described annular overflow trough.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108004586A (en) * | 2018-01-24 | 2018-05-08 | 河南星光机械制造有限公司 | A kind of molten zinc device of electrogalvanizing or zinc-nickel production line |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108004586A (en) * | 2018-01-24 | 2018-05-08 | 河南星光机械制造有限公司 | A kind of molten zinc device of electrogalvanizing or zinc-nickel production line |
| CN108004586B (en) * | 2018-01-24 | 2023-12-29 | 河南星光机械制造有限公司 | Zinc dissolving device for electrogalvanizing or zinc-nickel production line |
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Application publication date: 20151230 |