CN105953628A

CN105953628A - Plate heat exchanger with changeable ripple heights

Info

Publication number: CN105953628A
Application number: CN201610348827.0A
Authority: CN
Inventors: 赵炜
Original assignee: Yu Renlin
Current assignee: Qinhuangdao Ruhr Energy Saving Technology Co., Ltd.
Priority date: 2015-04-29
Filing date: 2015-04-29
Publication date: 2016-09-21
Anticipated expiration: 2035-04-29
Also published as: CN106017163A; CN106017159B; CN106052465B; CN106017163B; CN105953621B; CN105953628B; CN104792217A; CN106052465A; CN105953621A; CN106017192B; CN104792217B; CN106017192A; CN106017159A

Abstract

The invention provides a plate heat exchanger which comprises heat exchange plates and sealing gaskets, wherein each sealing gasket is positioned between every two adjacent heat exchange plates and is mounted in a sealing groove on the periphery of the heat exchange plates; the heights of ripples on different heat exchange plates are greater when the distance between each heat exchange plate and an inlet of heat exchanger fluid is longer. According to the invention, change of the ripple height ensures certain flow rate of the fluid to further improve the heat exchanging effect.

Description

A kind of plate type heat exchanger of wave height change

Technical field

The invention belongs to field of heat exchangers, particularly relate to a kind of plate type heat exchanger.

Background technology

Gasket seal between heat exchange plate can make the repair and maintenance of plate type heat exchanger more rapidly at present, can change pad the most on the spot.But this structure exists certain shortcoming and defect, when gasket seal is connected with plate, pad easily channels bit, deviates seal groove, makes the sealing function of pad decline and causes leaking and even lost efficacy, severely impacts the serviceability of plate type heat exchanger.

Summary of the invention

The present invention has only solved plate type heat exchanger with the gasket seal that same is new and has sealed bad problem, and to achieve these goals, technical scheme is as follows:

A kind of heat exchange plate used in plate type heat exchanger, described heat exchange plate arranges sealed groove, described sealed groove is trapezium structure, the both sides up and down of described trapezium structure are parallel limit, top is minor face, is long limit below, and the minor face position on parallel two limit of described trapezium structure arranges opening, described gasket seal is the trapezium structure worked in coordination with sealed groove, and described gasket seal is put in sealed groove from opening part.

As preferably, described sealed groove arranges projection in the inside on two limits, left and right.

As preferably, projection is triangle.

As preferably, described projection be often respectively provided with multiple.

As preferably, described heat exchange plate arranges at least one by-passing parts, the flow path flowing through the heat exchanging fluid of heat exchange plate is divided at least two flow manifold by described by-passing parts, by-passing parts arranges opening, making point Cheng Liudao in described heat exchange plate is cascaded structure, so that heat exchanging fluid forms S-shaped runner on heat exchange plate.

Preferably, the Opening length L1 of by-passing parts, a length of L2 of by-passing parts, flow manifold width W, then meet following relational expression:

L1/L=a-b*Ln(L1/ W)-c*( L1/ W)；

Wherein L=L1+L2；

400<L<800mm,80<L1<140mm,130<W<150mm；Ln is logarithmic function

0.17<L1/L<0.22, 0.5< L1/ W <1.1

0.18<a<0.21,0.014<b<0.016,0.0035<c<0.004。

Preferably, by-passing parts is realized by seal groove and sealing gasket, and described seal groove is arranged on heat exchange plate, by being inserted in seal groove by sealing gasket, thus forms by-passing parts.

Preferably, sealing gasket uses elastomeric material.Described elastomeric material is made up of the raw material of following parts by weight: ethylene propylene diene rubber 7-9 part, butadiene-styrene rubber 3-6 part, zinc oxide 6-8 part, white carbon 13-15 part, accelerator 4-5 part, foaming agent 2-8 part, naphthenic oil 5-6 part, titanium dioxide 20 parts, natural rubber 50-55 part, Rhein dissipates 10-13 part, silicone rubber 15-17 part, carborundum 2 parts, Melamine 2 parts, 0.6 part to 1.5 parts of age resistor, softening agent 4 parts to 6 parts, vulcanizing agent 2.2 parts to 4 parts.

Preferably, along the direction of fluid flowing, the width W of different flow manifolds constantly reduces.

Preferably, described heat exchange plate uses Cu alloy material, described copper alloy is processed by copper, ferrum, manganese, cerium, magnesium, stannum, silver, chromium and other auxiliary materials, in described copper alloy, percentage by weight shared by each composition is respectively as follows: copper 71.2%～82.5%, ferrum 3.3%～4.5%, manganese 1.1%～2.5%, cerium 0.35%～0.45%, magnesium 0.77%～1.3%, stannum 0.028%～0.14%, silver 0.06%～0.09%, chromium 0.3%～0.9%, remaining as auxiliary material.

Compared with prior art, plate type heat exchanger and the heat exchange plate thereof of the present invention has the advantage that

1) present invention is by arranging the sealed groove of trapezium structure and corresponding gasket seal, so that sealed groove and gasket seal being entrenched togather tightly, it is to avoid use binding agent, add the fastness of sealing.

2) present invention only seals structure with the change of same plate and realizes the hot and cold unequal demand of side liquid actual internal area, and the plate type heat exchanger that these plates assemble uses the unilateral assembling form taken over, and can save the biggest installation and maintenance cost.

3) present invention passes through test of many times, obtains an optimum heat exchange plate optimum results, and is verified by test, thus demonstrates the accuracy of result.

4) material of new heat exchange plate is developed.

5) material of new gasket seal is developed.

6) arranged by the change of channel width, improve the coefficient of heat transfer.

Accompanying drawing explanation

Fig. 1 is plate type heat exchanger seal groove schematic diagram of the present invention；

Fig. 2 is gasket seal cross sectional representation of the present invention；

Fig. 3 is the plate type heat exchanger schematic diagram that a runner is in parallel；

Fig. 4 is the schematic diagram of the plate type heat exchanger of runner series connection；

Fig. 5 is the schematic diagram of the present invention point journey sheet structure；

Fig. 6 is the structural representation of the present invention point journey pad；

Fig. 7 is the sheet structure schematic diagram of the fluid that the flow of the present invention is big；

Fig. 8 is the structural representation of the present invention point journey plate；

Fig. 9 is the scale diagrams of point journey plate of Fig. 5.

Reference is as follows:

1 first fluid import, 2 first fluid outlets, 3 second fluid imports, 4 second fluid outlets, 5 end plates, 6 end plates, 7 flow manifolds, 8 flow seal grooves, 9 flow seal pads, 10 heat exchange plates, 11 flow manifolds, 12 flow manifolds, 13 gasket seals, sealed groove 14, protruding 15, protruding 16, opening 17, recess 18.

Detailed description of the invention

Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in detail.

Herein, without specified otherwise, relating to formula, "/" represents that division, "×", " * " represent multiplication.

A kind of plate type heat exchanger, described plate type heat exchanger includes heat exchange plate 10, gasket seal 13, gasket seal 13 is between adjacent heat exchange plate 10, described gasket seal 13 is arranged in the sealed groove 14 of heat exchange plate 10 periphery, described sealed groove, 14 is trapezium structure, the both sides up and down of described trapezium structure are parallel limit, top is minor face, it is long limit below, the minor face position on parallel two limit of described trapezium structure arranges opening 17, described gasket seal 17 is the trapezium structure worked in coordination with sealed groove, described gasket seal 13 is put in sealed groove 14 at opening 17.

By arranging the sealed groove of trapezium structure and corresponding gasket seal, so that sealed groove and gasket seal being entrenched togather tightly, it is to avoid use binding agent, add the fastness of sealing.

As preferably, described trapezium structure is isosceles trapezoidal structure.

As preferably, described sealed groove 14 arranges protruding 15 in the inside on two limits, left and right, and corresponding therewith, the outside of two limits, left and right at the trapezium structure of gasket seal 13 arranges with protruding, the recess 18 of 15 correspondences.Pass through said structure so that it is more firm that sealed groove and gasket seal are fitted together to, and sealing effectiveness is more preferable.

As preferably, described sealed groove 14 arranges protruding 16 in the inside on the limit of bottom, and corresponding therewith, the outside of limit in the bottom of the trapezium structure of gasket seal 13 arranges with protruding, the recess 19 of 16 correspondences.Pass through said structure so that it is more firm that sealed groove 14 and gasket seal 13 are fitted together to, and sealing effectiveness is more preferable.

As preferably, protruding 15 is triangle, and protruding 16 is rectangle.

As preferably, described protruding 15 be often respectively provided with multiple, individual as preferably 3-5.

As preferably, the lower edge of triangular hill 15 is parallel with the limit of trapezoidal bottom.By so arranging, it is more prone to so that install gasket seal 13, easy for installation.

As preferably, the angle on limit, two, trapezoidal left and right and long limit (i.e. the limit of bottom) is 40-70 °, preferably 50-60 °.A length of 1:(2-4 between trapezoidal height and minor face), preferably 1:3.Such angle and length are set, on the one hand to consider the fastness being fitted together to, on the one hand to consider the convenience installed.Angle is the least, the highest, then install the most difficult, but chimeric fastness is good, good sealing effect.Otherwise, angle is the biggest, the lowest, then it is the easiest to install, but chimeric fastness is poor, and sealing effectiveness is poor.Above-mentioned angle and height are to consider the effect considering the optimum obtained that installation convenience and chimeric fastness are carried out.

Generally, the cross-sectional area of plate-type heat exchanger slab both sides cold and hot fluid passage is equal (Fig. 3 a).In this case, if the flow of two kinds of fluids (referring to volume flow) is more or less the same, now the runner of same fluid can be in the way of taking parallel connection parallel to each other, such as Fig. 3 a, now the coefficient of heat transfer of plate type heat exchanger two side liquid is more or less the same, and the whole heat exchanger coefficient of heat transfer is the highest, and so arranges it is also possible that the import and export of two kinds of fluids are all on an end plate 5, as shown in Figure 3 b, beneficially disassembling of plate type heat exchanger is overhauled and plate cleaning.If but when two kinds of flow bigger fluids of difference carry out heat exchange, if two kinds of fluids all take fluid passage in parallel, then the flow velocity that there will be relatively low discharge is the lowest, thus causes the lower coefficient of heat transfer.Therefore generally low-flow fluid passage is arranged to the form of series connection, as shown in fig. 4 a, thus the four of cold fluid and hot fluid import and export cannot be provided entirely on an end plate, can only be arranged on two end plates 5,6, as shown in Figure 4 b, two end plates all arrange fluid inlet and outlet connectors, when heat exchanger is in connection status with pipeline, plate type heat exchanger, by difficult for dismounting, needs two ends to dismantle, and causes maintenance inconvenience.

The heat exchange plate 10 used in described plate type heat exchanger, described heat exchange plate 10 arranges at least one by-passing parts, the flow path flowing through the heat exchanging fluid of heat exchange plate is divided at least two and divides Cheng Liudao 7 by described by-passing parts, and point Cheng Liudao 7 in described heat exchange plate 10 is cascaded structure.Cascaded structure by above-mentioned point Cheng Liudao 7 so that fluid is therefore through all of point of Cheng Liudao 7, as shown in Figure 6, so that heat exchanging fluid forms S-shaped runner on heat exchange plate 10.

By arranging by-passing parts so that the fluid that flow is little can be full of whole heat exchange plate, thus avoids the heat exchange area some fluid short occur, thus adds the coefficient of heat transfer, improves the coefficient of heat transfer of whole heat exchanger；In addition, by arranging by-passing parts, the fluid making low discharge also is able to realize the parallel connection of the fluid passage in multiple plates, as shown in Figure 3 a, avoid the need to improve the coefficient of heat transfer and little fluid passage is set to the structure of the series connection shown in Fig. 4 a, so that the four of fluid are imported and exported 1-4 and are all disposed within same end plate, so that easy to maintenance.

The volume flow of large flow fluid is more than 2 times of the volume flow of low discharge fluid.

As preferably, by-passing parts is realized by seal groove 8 and sealing gasket 9, and described seal groove 8 is arranged on heat exchange plate, by being inserted in seal groove 8 by sealing gasket 9, thus forms by-passing parts.

As preferably, seal groove and sealing gasket are respectively adopted Fig. 1, the seal groove of 2 structures and sealing gasket.

As preferably, by-passing parts is to realize by directly arranging sealing strip on heat exchange plate.As preferably, sealing strip and heat exchange plate integration manufacture.

On the fluid inlet of heat exchange plate and the two ends up and down of outlet, i.e. the two ends up and down of Fig. 5, by-passing parts is at one end to close, at the other end, opening is set, wherein along left and right directions, aperture position is to be disposed alternately at upper and lower two ends, so ensures that fluid passage forms S-shaped.

What before note that and direction up and down mentioned later was not limited in use state is direction up and down, is only used to state the structure of the plate in Fig. 5 herein.

Fig. 5, plate described in 8 are because being provided with two by-passing parts, and therefore the import and export of fluid are arranged on top and bottom.Can certainly arrange 1 or odd number by-passing parts, the import and export position of fluid now is located on same one end, is positioned at upper end or lower end the most simultaneously.

Foregoing S-shaped runner can be half S-shaped, the situation of one by-passing parts is the most only set, it can also be whole S-shaped, such as Fig. 5, the form of 8, can also be the combination of multiple S-shaped and/or half S-shaped, such as, arrange the situation more than 2 by-passing parts, such as 3 by-passing parts be exactly the combination of 1 one S-shaped and half S-shaped, 4 by-passing parts are exactly 2 S-shaped, etc. by that analogy.

For using the form of sealing gasket, as preferably, the pad integrated design of the setting between sealing gasket and heat exchange plate for plate heat exchanger sheet, therefore present invention provides the pad used between heat exchange plate in plate type heat exchanger in.Described pad arranges at least one flow seal pad 9, the flow path flowing through the heat exchanging fluid of heat exchange plate is divided at least two and divides Cheng Liudao 7 by described flow seal pad 9, a point Cheng Liudao 7 in described heat exchange plate 10 is cascaded structure, so that heat exchanging fluid forms S-shaped runner on heat exchange plate 10.

In numerical simulation with it was found that, by arranging by-passing parts, it is possible to make the heat exchanger coefficient of heat transfer increase, but while also bring the increase of flow resistance.Found by numerical simulation and experiment, width for flow manifold, if it is too small, flow resistance can be caused excessive, and the pressure-bearing of heat exchanger is too big, and may produce runner dual-side interlayer and overlap along fluid flow direction, and cause the coefficient of heat transfer to decline, in like manner, flow manifold is excessive also results in the coefficient of heat transfer reducing plate type heat exchanger, therefore has a suitable numerical value for split channel 7；Length for by-passing parts opening also has certain requirement, if too small openings, the quantity that fluid can be caused to be flow through by opening is too small, the coefficient of heat transfer is reduced while increasing pressure, in like manner, if excessive, then fluid can produce short-circuited region, do not have corresponding heat transfer effect, therefore opening is also had to a suitable length.Therefore between the Opening length of by-passing parts, the length of by-passing parts, flow manifold width, meet an optimized size relationship.

Therefore, the present invention is thousands of the numerical simulations by multiple various sizes of heat exchangers and test data, in the case of meeting industrial requirements pressure-bearing (below 2.5MPa), the dimensionally-optimised relation of the optimal heat exchange plate summed up in the case of meeting maximum heat exchange amount.

As it is shown in figure 9, the Opening length L1 of by-passing parts, a length of L2 of by-passing parts, flow manifold width W, then meet following relational expression:

L1/L=a-b*Ln(L1/ W)-c*( L1/ W)；

Wherein L=L1+L2；

400<L<800mm,80<L1<140mm,130<W<150mm；Ln is logarithmic function

0.17<L1/L<0.22, 0.5< L1/ W <1.1

0.18<a<0.21,0.014<b<0.016,0.0035<c<0.004。

Wherein Opening length is along by-passing parts, reaches the farthest position of fluid passage from the edge, position that opening occurs, such as the A point in Fig. 9.

As preferably, a=0.19, b=0.015, c=0.0037；

As preferably, along with being continuously increased of L1/ W, the numerical value of a constantly reduces；

As preferably, along with being continuously increased of L1/ W, the numerical value of b, c is continuously increased.

As preferably, the flow velocity of the fluid of split channel is 0.4-0.8m/s, it is preferable that 0.5-0.6m/s, and the heat transfer effect taking above-mentioned formula to obtain under this flow velocity is best.

Preferably, plate spacing 4-6mm of heat exchanging plate of heat exchanger, preferably 5mm.

For the form integrated with pad using sealing gasket in Fig. 6, in the case of also meeting above-mentioned formula, heat transfer effect is optimum.

As preferably, multiple by-passing parts are parallel to each other.

As preferably, along the direction (i.e. the fluid intake of distance heat exchange plate is the most remote) of fluid flowing, the width W of flow manifolds different on same heat exchange plate constantly reduces.Such as, the width of the flow manifold 7 in Fig. 5 is more than flow manifold 11, and the width of flow manifold 11 is more than flow manifold 12.Constantly reduce so that fluid constantly accelerates by flow manifold width W, it is to avoid because the fluid caused that is short of power runs slowly.

As preferably, along the direction of fluid flowing, the width W of same flow manifold constantly reduces.Such as, in flow manifold 7, along fluid flow direction (i.e. Fig. 5 is from top to bottom), width W constantly reduces.Now, mean breadth W is used for the W in preceding formula.

As preferably, on various heat exchange plate, distance heat exchanger fluid entrance is the most remote, and flow manifold width is the least.Mainly distance entrance is the most remote, then distribution fluid is the fewest, makes fluid ensure certain flow velocity by the change of width of flow path.

As preferably, heat exchange plate arranges ripple, and the height of ripple is different.On same plate, along the flow path of fluid, the wave height in same split channel gradually rises, such as, in flow manifold 7, along fluid flow direction (i.e. Fig. 5 is from top to bottom), wave height gradually rises.

As preferably, flow manifold distance heat exchange plate fluid intake distance is the most remote, and the height of the ripple in different flow manifolds is the highest, and such as, the wave height in flow manifold 7 in Fig. 5 is less than flow manifold 11, and the wave height of flow manifold 11 is less than flow manifold 12.

As preferably, on various heat exchange plate, distance heat exchanger fluid entrance is the most remote, and wave height is the highest.Mainly distance entrance is the most remote, then distribution fluid is the fewest, makes fluid ensure certain flow velocity by the change of wave height.

As preferably, heat exchange plate arranges ripple, and the density of ripple is different.On same plate, along the flow path of fluid, the corrugation density in same split channel becomes larger, such as, in flow manifold 7, along fluid flow direction (i.e. Fig. 5 is from top to bottom), corrugation density becomes larger.

As preferably, flow manifold distance heat exchange plate fluid intake distance is the most remote, and the density of the ripple in different flow manifolds becomes big.Such as, the corrugation density in flow manifold 7 in Fig. 5 is less than flow manifold 11, and the corrugation density of flow manifold 11 is less than flow manifold 12

As preferably, on various heat exchange plate, distance heat exchanger fluid entrance is the most remote, and corrugation density is the biggest.Mainly distance entrance is the most remote, then distribution fluid is the fewest, makes fluid ensure certain flow velocity by the change of wave height.

As preferably, the amplitude that wave height noted earlier and/or density increase is more and more less.

As preferably, described heat exchange plate uses Cu alloy material, described copper alloy is processed by copper, ferrum, manganese, cerium, magnesium, stannum, silver, chromium and other auxiliary materials, in described copper alloy, percentage by weight shared by each composition is respectively as follows: copper 71.2%～82.5%, ferrum 3.3%～4.5%, manganese 1.1%～2.5%, cerium 0.35%～0.45%, magnesium 0.77%～1.3%, stannum 0.028%～0.14%, silver 0.06%～0.09%, chromium 0.3%～0.9%, remaining as auxiliary material.

As preferably, described auxiliary material is mixed and processed by zinc chloride and Linesless charcoal.

As preferably, in described copper alloy, percentage by weight shared by each composition is respectively as follows: copper 76.3%, ferrum 4.4%, manganese 1.8%, cerium 0.5%, magnesium 1.07%, stannum 0.007%, silver 0.75%, chromium 0.6%, remaining as auxiliary material.

The processing method of above-mentioned copper alloy is as follows:

1, with intermediate frequency furnace cathode copper melted and be warming up to 1300～1400 DEG C, adding crome metal, silver insulation 33 minutes；

2, after pulling slag out, add remaining composition and stir.Then tapping casting, and control furnace temperature at 1340 DEG C；

3, use semi continuous casting, protect with nitrogen during casting；

4, as required foundry goods is forged or pressure processing becomes parts, then parts are heated to 3 hours hardening of 900 DEG C of insulations, then insulation carries out Ageing Treatment in 2～3 hours at a temperature of 479 DEG C；

The copper alloy made through above-mentioned specification has characteristic high temperature resistant, that heat conductivity is high, and substantially improves non-deformability and wearability.

As preferably, the gasket seal between sealing gasket 9 and/or heat exchange plate uses elastomeric material.Described elastomeric material is made up of the raw material of following parts by weight: ethylene propylene diene rubber 7-9 part, butadiene-styrene rubber 3-6 part, zinc oxide 6-8 part, white carbon 13-15 part, accelerator 4-5 part, foaming agent 2-8 part, naphthenic oil 5-6 part, titanium dioxide 20 parts, natural rubber 50-55 part, Rhein dissipates 10-13 part, silicone rubber 15-17 part, carborundum 2 parts, Melamine 2 parts, 0.6 part to 1.5 parts of age resistor, softening agent 4 parts to 6 parts, vulcanizing agent 2.2 parts to 4 parts.

As preferably, ethylene propylene diene rubber 8 parts, butadiene-styrene rubber 5 parts, zinc oxide 7 parts, white carbon 14 parts, accelerator 4 parts, foaming agent 4 parts, naphthenic oil 6 parts, titanium dioxide 20 parts, natural rubber 52 parts, Rhein dissipates 12 parts, 16 parts of silicone rubber, carborundum 2 parts, Melamine 2 parts；0.9 part of age resistor, softening agent 5 parts, vulcanizing agent 3 parts.

Manufacture method comprises the steps:

A. be sequentially added into described ethylene propylene diene rubber in banbury, butadiene-styrene rubber, zinc oxide, white carbon, accelerator, foaming agent, naphthenic oil, titanium dioxide, natural rubber, Rhein dissipate, silicone rubber, carborundum, Melamine and accelerator and age resistor, then start banbury and carry out the most mixing, 70 seconds to 75 seconds time, temperature is 60 DEG C to 70 DEG C；

B. adding softening agent in the banbury of step A and carry out the most mixing, 75 seconds time, temperature is less than 105 DEG C, then cools down binder removal；

C. sulfuration: the glue of step B is discharged on tablet machine add vulcanizing agent and turns refining, second time 125-140, bottom sheet and get final product.

As preferably, accelerator is diphenylguanidine.

As preferably, described accelerator is dithiocar-bamate；Described age resistor is Tissuemat E；Described softening agent is paraffin；Described vulcanizing agent is curing resin.

Described rubber has the advantage that 1) compounded by the material of interpolation zinc oxide, titanium dioxide, resulting materials good springiness, and there is certain hardness, wear-resisting durable, the life-span is long, the most easy to wear.2) owing to using Tissuemat E as antiaging agent, the persistence of rubber, hardness and abrasion resistance can be improved；3) cure time is short, makes rubber be become the macromole of space network by the macromolecules cross-linking of linear structure, its anti-tensile of the rubber of output, surely stretch, wear-resisting performance good.

The two side walls of described heat exchange plate 3 arranges anticorrosive coat.The anticorrosive coat of low-temperature receiver and/or heat source side wall is to be generated by coating anticorrosive paint, the mass percent of anticorrosive paint component is as follows: zinc flake 6.6-8.3%, aluminium oxide is 8-9%, boric acid is 7.2-9.2%, acrylic acid is 0.7-0.9%, and wetting dispersing agent is 0.4-0.5%, and thickening agent is 0.15-0.23%, defoamer is 0.14-0.23%, the water of surplus.This kind of coating is applied over heat exchange plate surface by spraying, brushing, dip-coating, dries 10～60 minutes for 80 ± 10 DEG C, and 280 ± 40 DEG C of solidifications sinter 30～60 minutes, form good anti-corrosion coating.

The method preparing above-mentioned water-based anticorrosive paint, the method according to following steps implement,

A, by coating gross mass percentage ratio, weigh a certain amount of water, the wetting dispersing agent of 0.4% and the defoamer of 0.23% respectively, the most admixed together, it is sufficiently stirred for being allowed to dissolving and makes coating mixed liquor A 1, in mixed liquor A 1, add the flake metal powder of account for coating gross mass 8.3% again, stir and make coating mixed liquor A 2；

B, by coating gross mass percentage ratio, weigh 7.3% boric acid, form mixed liquor, join the water of 20%～40% fully dissolves and make mineral acid mixed liquid B 1, then in mixed liquid B 1, add the oxidate powder of 8%, stirring makes mineral acid mixed liquid B 2 to without precipitation；

C, by coating gross mass percentage ratio, weigh the acrylic acid of 0.7%, join in the water of 5%～15%, stir and make reducing agent mixed liquor C；

D, by coating gross mass percentage ratio, weigh the thickening agent hydroxyethyl cellulose of 0.15%, join in the water of 2.5%～15%, stirring to dissolve be translucent shape and without gel occur i.e. stop stirring making thickening agent mixed liquor D；

E, the mineral acid mixed liquid B 2 of preparation is joined in coating mixed liquor A 2, it is subsequently adding the 1/5～1/2 of reducing agent mixed liquor C amount of preparation, add thickening agent mixed liquor D while stirring, add the water of surplus, continue stirring 30～90 minutes, until coating mixed liquor uniformity soilless sticking granule, finally add remaining reducing agent mixed liquor C, it is stirred for 10～40 minutes, to obtain final product.

This kind of coating is applied over finned tube surface by spraying, brushing, dip-coating, dries 10～60 minutes for 80 ± 10 DEG C, and 280 ± 40 DEG C of solidifications sinter 30～60 minutes, form good anti-corrosion coating.

Described wetting dispersing agent is the SA-20 in peregal series, and described thickening agent selects hydroxyethyl cellulose；Tributyl phosphate selected by described defoamer.

Fig. 7 illustrates the flow channel of the big fluid of flow, it practice, for the present invention, two kinds of heat exchanging fluids can use the fluid that flow is little.Such as in the case of heat exchange plate is certain, the flow of two kinds of fluids is the least, and now the flow channel of two kinds of fluids can take the plate of Fig. 5, Fig. 8 form.

Although the present invention discloses as above with preferred embodiment, but the present invention is not limited to this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.

Claims

1. a plate type heat exchanger, described plate type heat exchanger includes heat exchange plate, gasket seal, gasket seal is between adjacent heat exchange plate, described gasket seal is arranged in the sealed groove of heat exchange plate periphery, described sealed groove, for trapezium structure, the both sides up and down of described trapezium structure are parallel limit, top is minor face, it is long limit below, the minor face position on parallel two limit of described trapezium structure arranges opening, and described gasket seal is the trapezium structure worked in coordination with sealed groove, and described gasket seal is put in sealed groove from opening part；Described sealed groove arranges projection in the inside on two limits, left and right.

2. plate type heat exchanger as claimed in claim 1, it is characterized in that, described heat exchange plate arranges at least one by-passing parts, the flow path flowing through the heat exchanging fluid of heat exchange plate is divided at least two flow manifold by described by-passing parts, and by-passing parts arranges opening so that point Cheng Liudao in described heat exchange plate is cascaded structure, so that heat exchanging fluid forms S-shaped runner on heat exchange plate, on various heat exchange plate, distance heat exchanger fluid entrance is the most remote, and wave height is the highest.

3. plate type heat exchanger as claimed in claim 2, it is characterised in that the amplitude that wave height increases is more and more less.

4. plate type heat exchanger as claimed in claim 1 or 2, it is characterised in that the Opening length L1 of by-passing parts, a length of L2 of by-passing parts, flow manifold width W, then meet following relational expression:

L1/L=a-b*Ln(L1/ W)-c*( L1/ W)；

Wherein L=L1+L2；

400<L<800mm,80<L1<140mm,130<W<150mm；Ln is logarithmic function

0.17<L1/L<0.22, 0.5< L1/ W <1.1

0.18<a<0.21,0.014<b<0.016,0.0035<c<0.004。