CN105506662A

CN105506662A - Heat exchange method of steel belt surface pretreatment system

Info

Publication number: CN105506662A
Application number: CN201510928610.2A
Authority: CN
Inventors: 龚立品; 圣祥; 王道路
Original assignee: Anhui Chujiang Special Steel Co Ltd
Current assignee: Anhui Chujiang Special Steel Co Ltd
Priority date: 2015-12-15
Filing date: 2015-12-15
Publication date: 2016-04-20
Anticipated expiration: 2035-12-15
Also published as: CN105506662B

Abstract

The invention discloses a heat exchange method of a steel belt surface pretreatment system, which belongs to the technical field of steel belt pickling. The heat exchange method comprises the following steps of (1) discharging a pickling solution in a pickling system; (2) charging steam to a capillary tube in a heater body; (3) conveying the discharged pickling solution to the heater body, so as to be heated: specifically, the pickling solution in an acid storage pool is pumped to the heater body, and the pickling solution flows from the outer side of the capillary tube filled with high-temperature steam, so as to be gradually heated by the high-temperature steam in the capillary tube, so that the temperature of the pickling solution is gradually increased; (4) flowing the heated pickling solution back to the steel belt pickling system. By adopting the technical scheme of the heat exchange method, a great amount of steam can be prevented from generating in a pickling tank, and the leakage and waste of the pickling solution can be prevented, so that the production cost is reduced.

Description

A kind of heat-exchange method of steel strip surface pretreatment system

Technical field

The present invention relates to steel band processing technique field, more particularly, relate to a kind of heat-exchange method of steel strip surface pretreatment system.

Background technology

Steel band is easily oxidized in wet environment, the oxide skin that its surface has one deck thicker, cause its finished product variable color comparatively obvious, have a strong impact on the quality of strip product and attractive in appearance, therefore steel band is before entering cold rolling process, generally all needs first to carry out surface preparation, removes the oxide skin of steel strip surface attachment, current widely used pretreatment mode is cleanup acid treatment, and the main purpose of pickling is the impurity effectively removing steel strip surface.If steel band pickling is not thorough, directly causes impurity press-in steel strip surface in making processes on the one hand, affect the quality of cold-rolled products; Another aspect causes disadvantageous effect to the gloss level of roll of lower road cold rolling process and emulsion life-span.Therefore as cold rolling former process, cleanup acid treatment operation is most important.

In prior art, the pickling pre-treatment of steel band is generally that then steel band is first scrubbed through washing and brushing device through pickling tub pickling, brush away the impurity of steel strip surface, then clean through service sink, but in pickling tub continuous pickling process, need the temperature making pickle solution keep certain, directly carrying out pickle solution easily making pickling line produce a large amount of steam acid mists etc. in heat-processed, and acid mist easily spreads in air, make the corrosion that surrounding enviroment and equipment are subject in various degree, along with the continuous propelling of technology and the continuous enhancing of environmental consciousness, the heat exchange mode of steel band pickling line is badly in need of improving further.

About the pretreated technological improvement of steel strip surface, in prior art, existing Patents is open, such as Chinese Patent Application No.: 2013205907586, the applying date is on September 24th, 2013, invention and created name is: a kind of steel band rust cleaning pickling line, this application case relates to a kind of steel band rust cleaning pickling line, comprise pickling tank and Rinsing Area, the stone roll groove lid of acid fog absorption tower and corresponding stone roll is provided with above pickling tank, between pickling tank and Rinsing Area, top is provided with excessive acid tank cover, excessive acid tank cover and stone roll groove lid junction, stone roll groove lid and acid fog absorption tower junction are equipped with groove, and clear water is marked with in groove, acid mist is enclosed in pickling tank by water seal by this application case, thus do not make acid mist leak outside, but this application case can only reduce acid mist to leaking in air, the generation of acid mist can not be reduced from source, and the problem that pickle solution evaporate into the pickle solution waste caused in groove cannot be solved, require further improvement.

Summary of the invention

the technical problem that invention will solve

The present invention is directed to the deficiency of a large amount of acid mist of the easy generation of acid solution heating in pickling system in prior art, provide a kind of heat-exchange method of steel strip surface pretreatment system, effectively can reduce the generation of acid mist, and avoid the waste of pickle solution, thus reduction production cost, improve pickling environment.

technical scheme

For achieving the above object, technical scheme provided by the invention is:

The heat-exchange method of a kind of steel strip surface pretreatment system of the present invention, comprises the following steps:

Step one: the pickle solution in pickling system is discharged;

Open the ACID on pickling tub, the pickle solution in pickling system is discharged to and deposits in sour pond, wait to be heated;

Wherein said pickling system is a part for steel strip surface pretreatment system, described steel strip surface pretreatment system comprises the system of peeling off, pickling system and circulating heater, the described system of peeling off comprises the decorticator set gradually, dry brush machine, transfer roller and storage disks, described decorticator comprises maxilla roller mechanism and lower jaw roller mechanism, one end of maxilla roller mechanism and lower jaw roller mechanism is hinged, and lower jaw roller mechanism and maxilla roller mechanism intersects and is provided with shelling roll;

Described dry brush machine comprises brush roll, lower brush roll, rotating disk body, the first hydro-cylinder and the second hydro-cylinder, the parallel distribution upper and lower with lower brush roll of upper brush roll, the two ends of upper brush roll and lower brush roll are separately fixed on two rotating disk bodies, and the first hydro-cylinder and the second hydro-cylinder are hinged on the both sides of one of them rotating disk body; Transfer roller comprises two pressure rollers of about two parallel distributions, and steel band is introduced into storage disks after passing between two pressure rollers; Steel band enters pickling system after storage disks passes;

Described pickling system comprises the guide roller, supporting roll, pressure roller I, pickling tank, pressure roller II, Rinsing Area, pressure roller III and the drying air knife that set gradually from left to right, described pressure roller I and pressure roller II are separately positioned on the entrance and exit position of pickling tank, pressure roller III is arranged on above Rinsing Area, and the exit of Rinsing Area is also provided with drying air knife;

Described pickling tank comprises plural pickling tub, the bottom of adjacent acid wash pool is connected, pickling tub side-wall outer side is provided with sealed structure, comprises the sealing sidewall be connected mutually with pickling tub sidewall, the groove formed between described sealing sidewall and pickling tub sidewall is water sealed tank; All acid tank cover is stamped above each pickling tub;

Described circulating heater is arranged on the side of pickling tank, comprise ACID, deposit sour pond, heater body and acid inlet tube, one end of described ACID is connected with pickling tub, the other end of ACID with deposit sour pond and be connected, described heater body is provided with acid extracting pipe road and deposits sour pond and be connected, road is provided with power-driven pump to acid extracting pipe, and one end of described acid inlet tube is connected with pickling tub, the other end and the heater body of acid inlet tube are connected, and heater body inside is provided with kapillary;

Step 2: be filled with steam in the kapillary of heater body inside;

Step 3: the pickle solution of discharge is sent in heater body and heats;

After step 2 terminates, flow in heater body by power-driven pump by the pickle solution deposited in sour pond through acid extracting pipe road, pickle solution is from the extracapillary effluent mistake being full of steam, and the temperature of pickle solution raises gradually;

Step 4: the pickle solution after heating is back in steel band pickling system;

After step 3 terminates, be back in pickling system by the pickle solution heated by the acid inlet tube on pickling tub, the heat transfer process of pickling system terminates.

Further, described acid tank cover comprises inwall, outer wall, upper cover and flow deflector, and inwall is positioned at below upper cover, and is connected in the surrounding position of upper cover, and inwall and upper cover form the cavity of a hollow, and namely inwall is placed in above-mentioned water sealed tank; Outer wall is arranged on the outside of inwall, and contacts with the upper surface of sealing sidewall; The medial surface of upper cover is also fixed with flow deflector along surrounding, described flow deflector is positioned at the inner side of inwall, and flow deflector tilts to upper cover centre, and flow deflector is contacted with the inner side of pickling tub sidewall, and the angle between flow deflector and pickling tub sidewall is α, α is acute angle.

Further, described acid tank cover also comprises stiffening plate, and wherein upper cover is arcuate structure, and described stiffening plate is arranged on the central position of upper cover medial surface, and the two ends of stiffening plate are connected mutually with flow deflector respectively.

Further, the explosionproof hole offering and run through its thickness is covered on described.

Further, the size of described angle α is 15 ~ 30 °.

Further, above described pickling tank, be also provided with acid mist purifying device, in described acid mist purifying device, be disposed with cooling zone, neutral zone, Two-step neutralization district and a scum dredger device.

Further, also squeezing roller is provided with between described pickling tank and Rinsing Area.

beneficial effect

Adopt technical scheme provided by the invention, compared with prior art, there is following unusual effect:

(1) the present invention realizes heat exchange by circulating heater, this circulating heater comprises ACID, deposits sour pond, heater body and acid inlet tube, one end of ACID is connected with pickling tub, the other end with deposit sour pond and be connected, heater body is provided with acid extracting pipe road and deposits sour pond and be connected, one end of acid inlet tube is connected with pickling tub, and the other end and the heater body of acid inlet tube are connected, and heater body inside is provided with a large amount of kapillary, heater body is also connected with the boiler house of production plant, high-temperature hot steam is constantly transported in the kapillary in heater body by boiler house, circulation in kapillary is made to have a large amount of high-temperature steam, when the pickle solution temperature of pickling tub declines, open ACID the pickle solution in pickling tub is entered to deposit in sour pond, then the acid extracting pipe road in heater body is driven by power-driven pump, by in the pickle solution suction heater body of depositing in sour pond, pickle solution slowly flows through from the outer side of a large amount of kapillary, thus heated gradually by the high-temperature steam of kapillary inside, be back in pickling tub through acid inlet tube again by the pickle solution after heated, the pickle solution temperature of pickling tub is finally made constantly to increase, adopt the mode of this groove external circulation heating to avoid hot steam and directly enter into pickling tub, thus avoid pressure in pickling tub and constantly rise, pickle solution also more easily evaporates the problem of leakage.

(2) in the present invention, pickling tub side-wall outer side is provided with sealed structure, comprise the sealing sidewall be connected mutually with pickling tub sidewall, the groove formed between sealing sidewall and pickling tub sidewall is water sealed tank, injected clear water in this water sealed tank, all acid tank cover is stamped above each pickling tub, and namely the inwall of acid tank cover is placed in water sealed tank, clear water in water sealed tank seals with the external world completely by inner for pickling tub, the pickle solution of pickling tub inside effectively can be prevented because by thermal evaporation and to external diffusion, avoid the pollution of pickle solution pair and outside atmosphere.

(3) cover in the present invention and be provided with flow deflector, and flow deflector tilts to upper cover centre, when acid tank cover is placed on above pickling tub, inwall is positioned at water sealed tank, and flow deflector contacts with the inner side of pickling tub sidewall just, intercept completely by between pickling tub sidewall and water sealed tank, when acid mist post liquefaction refluxes along upper cover, water sealed tank can cannot be entered because of the stop of flow deflector, thus all reflux in pickling tub along the smooth surface of flow deflector, further avoid diffusion and the waste of pickle solution.

Accompanying drawing explanation

Fig. 1 is the pickling system structural representation in the present invention;

Fig. 2 is the pickling tub structural representation in the present invention.

Label declaration in schematic diagram: 1, guide roller; 2, supporting roll; 3, pressure roller I; 4, acid tank cover; 5, pickling tank; 6, pressure roller II; 7, pressure roller III; 8, Rinsing Area; 9, drying air knife; 401, inwall; 402, outer wall; 403, upper cover; 404, flow deflector; 405, stiffening plate; 501, pickling tub; 502, water sealed tank; 503, pickling tub sidewall; 504, sidewall is sealed.

Embodiment

For understanding content of the present invention further, below in conjunction with drawings and Examples, the present invention is described in detail.

embodiment 1

As depicted in figs. 1 and 2, a kind of steel strip surface pretreatment system in the present embodiment comprises the system of peeling off, pickling system and circulating heater, wherein the system of peeling off comprises the decorticator set gradually, dry brush machine, transfer roller and storage disks, decorticator comprises maxilla roller mechanism and lower jaw roller mechanism, one end of maxilla roller mechanism and lower jaw roller mechanism is hinged, and lower jaw roller mechanism and maxilla roller mechanism intersects and is provided with shelling roll; Steel band passes between the shelling roll of top-bottom cross, and shelling roll causes alternating bending to steel band, thus the oxide skin on its surface is peeled off in a large number or shell pine.

Decorticator rear is also provided with dry brush machine, dry brush machine comprises brush roll, lower brush roll, rotating disk body, the first hydro-cylinder and the second hydro-cylinder, the parallel distribution upper and lower with lower brush roll of upper brush roll, the two ends of upper brush roll and lower brush roll are separately fixed on two rotating disk bodies, and the first hydro-cylinder and the second hydro-cylinder are hinged on the both sides of one of them rotating disk body; Steel band is after decorticator is peeled off, surface still has oxide skin in small, broken bits and remains, this oxide skin in small, broken bits is difficult to be removed by shelling roll, the roll surface of upper brush roll and lower brush roll then can carry out more meticulous brush to steel strip surface and sweep grinding, the oxide skin that further removal is residual, avoid steel band to bring oxide skin into pickling system together, effectively can reduce the usage quantity of pickle solution in follow-up pickling process, thus reduce production cost.It should be noted that the first hydro-cylinder that dry brush machine is arranged and the second hydro-cylinder can drive rotating disk body to rotate, namely upper brush roll and lower brush roll is driven to deflect along with rotating disk body carries out entirety, vertical spacing between brush roll and lower brush roll is diminished, thus avoid the defect that cannot touch steel band due to brush roll surface abrasion, effectively improve the work-ing life of brush roll and lower brush roll.

Transfer roller comprises two pressure rollers of about two parallel distributions, and steel band is introduced into storage disks after passing between two pressure rollers; Steel band enters pickling system after storage disks passes, the design of this storage disks is very important, in storage disks, steel band is sent into pickling system by first storage compartment steel band again, when needing the welding carried out between different coil band to change in the system of peeling off, long period may be taken, steel band in storage disks now can continue to export to pickling system, can not affect the normal production efficiency of pickling system.

Pickling system comprises the guide roller 1, supporting roll 2, pressure roller I 3, pickling tank 5, pressure roller II 6, Rinsing Area 8, pressure roller III 7 and the drying air knife 9 that set gradually from left to right, steel band passes between the up-down rollers of guide roller 1, effectively prevent in steel band traveling process and occur bob phenomenon, can stablize direct of travel and the position of steel band, supporting roll 2 can adjust the height of steel band further; Pressure roller I 3 and pressure roller II 6 are separately positioned on the entrance and exit position of pickling tank 5, and steel band is pressed in the pickle solution in pickling tank 5 by pressure roller I 3 and pressure roller II 6, steel band is soaked completely by pickle solution all the time in continuous forward movement, realizes acid cleaning process; Pressure roller III 7 is arranged on above Rinsing Area 8, steel band is pressed in the clear water in Rinsing Area 8 by pressure roller III 7, steel band is soaked by clear water all the time on surface in continuous forward movement, thus the pickle solution residual to steel strip surface cleans, the exit of Rinsing Area 8 is also disposed with squeezing roller and drying air knife 9, first the moisture that steel strip surface is residual is extracted and purge again, remove surface acid washing lotion further; Bring in Rinsing Area 8 for reducing steel band by pickle solution, the exit of pickling tank 5 is also provided with squeezing roller and blow-dry device.

For optimizing the pickling effect of steel band, obtain the steel band that surface quality is higher, more bright, contriver is also synchronously optimized the pickle solution used, and the pickle solution used in the present invention consists of the following composition: hydrochloric acid, and mass percent is 10 ~ 20%; Hydrofluoric acid, mass percent is 5 ~ 8%; Iron(ic) chloride, mass percent is 6 ~ 10%; Sodium laurylsulfate, mass percent is 0.5 ~ 1.5%; Sodium hexametaphosphate 99, mass percent is 0.1 ~ 0.8%, and all the other are water.Specifically in the present embodiment, hydrochloric acid mass percent is 10%, and hydrofluoric acid mass percent is 5%, and iron(ic) chloride mass percent is 6%, and sodium laurylsulfate mass percent is 0.5%, and Sodium hexametaphosphate 99 mass percent is 0.1%; Sodium laurylsulfate effectively can increase the activity of pickle solution, promotes to occur to answer with the oxide skin of steel strip surface, accelerates pickling speed, improves pickling efficiency; Sodium hexametaphosphate 99 contribute to removing rest on steel strip surface greasy dirt, oxidation and unoxidized surface impurity, improve the cleaning of steel strip surface, glossiness, the chlorion simultaneously introduced in pickle solution contributes to slowing down the rapid reaction of steel band and pickle solution, over-cleaning is avoided to cause steel strip substrate to occur corrosion, and effectively suppress the generation of acid mist, the work-ing life of pickle solution can be extended.

Plural pickling tub 501 is provided with in pickling tank 5, the bottom of adjacent acid wash pool 501 is connected, namely steel band is pass in pickling tub 501, sealed structure is had in pickling tub sidewall 503 arranged outside, comprise the sealing sidewall 504 be connected mutually with pickling tub sidewall 503, the groove formed between sealing sidewall 504 and pickling tub sidewall 503 is water sealed tank 502, injected clear water in this water sealed tank 502, clear water in water sealed tank 502 seals with the external world completely by inner for pickling tub 501, effectively can prevent the pickle solution of pickling tub 501 inside because being heated volatilization to external diffusion, avoid the pollution of pickle solution pair and outside atmosphere, acid tank cover 4 is all stamped above each pickling tub 501.

Acid tank cover 4 comprises inwall 401, outer wall 402, upper cover 403 and flow deflector 404, inwall 401 is positioned at below upper cover 403, and be connected in the surrounding position of upper cover 403, inwall 401 and upper cover 403 form the cavity of a hollow, in order to reduce the heat diffusion in pickling tub 501 as far as possible, the small volume of this hollow cavity, the height of upper cover 403 is lower; Namely inwall 401 is placed in water sealed tank 502; Outer wall 402 is arranged on the outside of inwall 401, and contacts with the upper surface of sealing sidewall 504, thus is hedged off from the outer world by water sealed tank 502, prevents having a small amount of acid mist in water sealed tank 502 and leaks; The medial surface of upper cover 403 is also fixed with flow deflector 404 along surrounding, flow deflector 404 is positioned at the inner side of inwall 401, and flow deflector 404 tilts to upper cover 403 centre, flow deflector 404 is contacted with the inner side of pickling tub sidewall 503, and the design of this flow deflector 404 is to prevent the leakage of pickle solution from wasting with evaporation further.

During pickling, pickle solution Yin Wendu impact can form acid mist, and acid mist gathers below upper cover 403 and can again liquefy, and the medial surface along upper cover 403 refluxes in pickling tub 501, and upper cover 403 is arcuate structure, is more conducive to the backflow of pickle solution, but technician finds in long-term production process, the part pickle solution of post liquefaction finally can be back in water sealed tank 502 along upper cover 403, gradually by the clear water acidifying in water sealed tank 502, also result in the wasting of resources of pickle solution, improves production cost, for avoiding this phenomenon, technician creatively with the addition of the design of flow deflector 404, this flow deflector is arranged on the inner side of inwall 401, and flow deflector 404 tilts to upper cover 403 centre, when acid tank cover 4 is covered above pickling tub 501, inwall 401 is positioned at water sealed tank 502, and flow deflector 404 contacts with the inner side of pickling tub sidewall 503 just, intercept completely by between pickling tub sidewall 503 and water sealed tank 502, when acid mist post liquefaction refluxes along upper cover 403, water sealed tank 502 can cannot be entered because of the stop of flow deflector 404, thus all reflux in pickling tub 501 along the smooth surface of flow deflector 404, avoid diffusion and the waste of pickle solution.Angle between this flow deflector 404 and pickling tub sidewall 503 is α (be specifically angle between flow deflector 404 and longitudinal vertical curve is in fig. 2 α, this longitudinal vertical curve parallels with pickling tub sidewall 503), the effect tool that the size of α refluxes for pickle solution has a certain impact, if α is excessive, it is excessive and speed is excessively slow by resistance during pickle solution can be caused to reflux, being unfavorable for again coordinating of whole acid tank cover 4 and pickling tub 501 if α is too small, causing the action that covers with opening limited; Technician gropes through continuous experiment, and final discovery is beneficial to production and application most when α is 15 ~ 30 °, neither affects the return velocity of pickle solution, and be also beneficial to coordinating of whole acid tank cover 4 and pickling tub 501, specifically α is 15 ° in the present embodiment.

For strengthening the structural strength of acid tank cover 4, in the central position of upper cover 403 medial surface, this arranges stiffening plate 405, and the two ends of stiffening plate 405 are connected mutually with flow deflector 404 respectively.Upper cover 403 offers the explosionproof hole running through its thickness, steel band in acid cleaning process because occurring that chemical reaction may displace a small amount of hydrogen, hydrogen was assembled and was easily caused security incident at most in pickling tub 501, in order to improve production security, technician has offered explosionproof hole on upper cover 403, this explosionproof hole size is less, can be discharged by the hydrogen produced at any time, can not cause leaking in a large number of acid mist again.

Acid mist purifying device is also provided with above pickling tank 5, cooling zone, neutral zone, Two-step neutralization district and a scum dredger device is disposed with in acid mist purifying device, two groups of acid mist purifying devices are provided with altogether in the present invention, respectively in the entrance and exit position of pickling tank 5, first the acid mist entered liquefies through cooling zone, carry out acid-base neutralisation respectively through a neutral zone and Two-step neutralization district again, eventually pass scum dredger and filter, clean gas is discharged.

The heat-exchange method of a kind of steel strip surface pretreatment system of the present embodiment is realized by circulating heater, this circulating heater is arranged on the side of pickling tank 5, comprise ACID, deposit sour pond, heater body and acid inlet tube, one end of ACID is connected with pickling tub 501, the other end of ACID with deposit sour pond and be connected, heater body is provided with acid extracting pipe road and deposits sour pond and be connected, road is provided with power-driven pump to acid extracting pipe, one end of acid inlet tube is connected with pickling tub 501, the other end and the heater body of acid inlet tube are connected, heater body inside is provided with a large amount of kapillary, heater body is also connected with the boiler house of production plant, the concrete heat exchange step of the present embodiment is as follows:

Step one: the pickle solution in pickling system is discharged;

Open the ACID on pickling tub (501), the pickle solution in steel band pickling tub (501) is discharged to and deposits in sour pond, wait to be heated;

Step 2: be filled with high-temperature steam in the kapillary of heater body inside;

A large amount of high-temperature steams in boiler house are constantly transported in the kapillary in heater body after terminating by step one, make circulation in kapillary have a large amount of high-temperature steam;

Step 3: the pickle solution of discharge is sent in heater body and heats;

After step 2 terminates, drive acid extracting pipe road by power-driven pump, be pumped in heater body by the pickle solution deposited in sour pond, pickle solution is from the numerous extracapillary effluent mistakes being full of high-temperature steam, thus heated gradually by the high-temperature steam of kapillary inside, the temperature of pickle solution is raised gradually;

After step 3 terminates, be back in pickling tub (501) by the acid inlet tube on pickling tub (501) by the pickle solution heated, finally make the pickle solution temperature in pickling tub 501 constantly increase, the heat transfer process of steel band pickling system terminates.Because the discharge of pickle solution is carried out, so do not affect normally advancing of steel band in heat-processed with continuous circulation of backflow.The many employings of traditional type of heating directly carry out heat to pickle solution in pickling tub 501, this mode not only can make to be covered with hot steam in whole pickling tub 501, pressure constantly rises, requirements at the higher level are had to equipment material performance, also the continuous evaporation of pickle solution self can be caused to leak, also may because be heated suddenly frequently cause the cracking of pickling tub sidewall 503; Technician adopts the mode of groove external circulation heating, and hot steam can not directly enter in pickling tub 501, then can effectively address these problems.

embodiment 2

With embodiment 1, difference is that in the present embodiment, α size is 20 °, in pickle solution in the present embodiment, hydrochloric acid mass percent is 20%, hydrofluoric acid mass percent is 8%, iron(ic) chloride mass percent is 10%, sodium laurylsulfate mass percent is 1.5%, and Sodium hexametaphosphate 99 mass percent is 0.8%, and all the other are water.

embodiment 3

With embodiment 1, difference is that in the present embodiment, α size is 30 °, in pickle solution in the present embodiment, hydrochloric acid mass percent is 15%, hydrofluoric acid mass percent is 7%, iron(ic) chloride mass percent is 8%, sodium laurylsulfate mass percent is 1.2%, and Sodium hexametaphosphate 99 mass percent is 0.5%, and all the other are water.

Schematically above be described the present invention and embodiment thereof, this description does not have restricted, and also just one of the embodiments of the present invention shown in accompanying drawing, actual structure is not limited thereto.So, if those of ordinary skill in the art enlightens by it, when not departing from the invention aim, designing the frame mode similar to this technical scheme and embodiment without creationary, all should protection scope of the present invention be belonged to.

Claims

1. a heat-exchange method for steel strip surface pretreatment system, is characterized in that, comprises the following steps:

Step one: the pickle solution in pickling system is discharged;

Open the ACID on pickling tub (501), the pickle solution in pickling system is discharged to and deposits in sour pond, wait to be heated;

Described dry brush machine comprises brush roll, lower brush roll, rotating disk body, the first hydro-cylinder and the second hydro-cylinder, the parallel distribution upper and lower with lower brush roll of upper brush roll, the two ends of upper brush roll and lower brush roll are separately fixed on two rotating disk bodies, and the first hydro-cylinder and the second hydro-cylinder are hinged on the both sides of one of them rotating disk body; Transfer roller comprises two pressure rollers of upper and lower parallel distribution, and steel band is introduced into storage disks after passing between two pressure rollers; Steel band enters pickling system after storage disks passes;

Described pickling system comprises the guide roller (1), supporting roll (2), pressure roller I (3), pickling tank (5), pressure roller II (6), Rinsing Area (8), pressure roller III (7) and the drying air knife (9) that set gradually from left to right, described pressure roller I (3) and pressure roller II (6) are separately positioned on the entrance and exit position of pickling tank (5), pressure roller III (7) is arranged on Rinsing Area (8) top, and the exit of Rinsing Area (8) is also provided with drying air knife (9);

Described pickling tank (5) comprises plural pickling tub (501), the bottom of adjacent acid wash pool (501) is connected, sealed structure is had in pickling tub sidewall (503) arranged outside, comprise the sealing sidewall (504) be connected mutually with pickling tub sidewall (503), the groove formed between described sealing sidewall (504) and pickling tub sidewall (503) is water sealed tank (502); Acid tank cover (4) is all stamped in each pickling tub (501) top;

Described circulating heater is arranged on the side of pickling tank (5), comprise ACID, deposit sour pond, heater body and acid inlet tube, one end of described ACID is connected with pickling tub (501), the other end of ACID with deposit sour pond and be connected, described heater body is provided with acid extracting pipe road and deposits sour pond and be connected, road is provided with power-driven pump to acid extracting pipe; One end of described acid inlet tube is connected with pickling tub (501), and the other end and the heater body of acid inlet tube are connected, and heater body inside is provided with kapillary;

Step 2: be filled with steam in the kapillary of heater body inside;

Step 3: the pickle solution of discharge is sent in heater body and heats;

After step 3 terminates, be back in pickling system by the pickle solution heated by the acid inlet tube on pickling tub (501), the heat transfer process of pickling system terminates.

2. the heat-exchange method of a kind of steel strip surface pretreatment system according to claim 1, it is characterized in that: described acid tank cover (4) comprises inwall (41), outer wall (402), upper cover (403) and flow deflector (404), inwall (401) is positioned at upper cover (403) below, and be connected in the surrounding position of upper cover (403), the cavity of inwall (401) and upper cover (403) composition hollow, inwall (401) is namely placed in above-mentioned water sealed tank (502); Outer wall (402) is arranged on the outside of inwall (401), and contacts with the upper surface of sealing sidewall (504); The medial surface of upper cover (403) is also fixed with flow deflector (404) along surrounding, described flow deflector (404) is positioned at the inner side of inwall (401), and flow deflector (404) tilts to upper cover (403) centre, flow deflector (404) is contacted with the inner side of pickling tub sidewall (503), and the angle between flow deflector (404) and pickling tub sidewall (503) is α, α is acute angle.

3. the heat-exchange method of a kind of steel strip surface pretreatment system according to claim 2, it is characterized in that: described acid tank cover (4) also comprises stiffening plate (405), wherein upper cover (403) is arcuate structure, described stiffening plate (405) is arranged on the central position of upper cover (403) medial surface, and the two ends of stiffening plate (405) are connected mutually with flow deflector (404) respectively.

4. the heat-exchange method of a kind of steel strip surface pretreatment system according to claim 3, is characterized in that: (403) offer the explosionproof hole running through its thickness to described upper cover.

5. the heat-exchange method of a kind of steel strip surface pretreatment system according to claim 1, is characterized in that: the size of described angle α is 15 ~ 30 °.

6. the heat-exchange method of a kind of steel strip surface pretreatment system according to Claims 2 or 3, it is characterized in that: described pickling tank (5) top is also provided with acid mist purifying device, is disposed with cooling zone, neutral zone, Two-step neutralization district and a scum dredger device in described acid mist purifying device.

7. the heat-exchange method of a kind of steel strip surface pretreatment system according to claim 2, is characterized in that: be also provided with squeezing roller between described pickling tank (5) and Rinsing Area (8).