CN101493298A - Corrosion resistant composite heat exchanger and method for producing the same - Google Patents
Corrosion resistant composite heat exchanger and method for producing the same Download PDFInfo
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- CN101493298A CN101493298A CNA2009100580631A CN200910058063A CN101493298A CN 101493298 A CN101493298 A CN 101493298A CN A2009100580631 A CNA2009100580631 A CN A2009100580631A CN 200910058063 A CN200910058063 A CN 200910058063A CN 101493298 A CN101493298 A CN 101493298A
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Abstract
The invention relates to a corrosion-resistant heat exchanger used for heat exchange with corrosive solution in the superficial treatment industry such as anodic oxidation, micro-arc oxidation, plating and the like and a manufacturing method thereof. A compound heat-exchanger tube of the heat exchanger is formed by sheathing a corrosion-resistant polymer material heat-shrink tube on the outer surface of a copper pipe or aluminum and leading the heat-shrink tube to be closely attached to the outer surface of the copper pipe or the aluminum by heating contraction to form a corrosion-resistant layer with the thickness of 0.1-0.5mm. The compound heat-exchanger tube of the heat exchanger is bent and shaped to be disk-shaped, U-shaped or spiral; a clamping board and a bolt are used for clamping and fixing, thereby obtaining the corrosion-resistant compound heat exchanger. The corrosion-resistant compound heat exchanger has simple manufacturing process, low cost, better corrosion of acid and base solution resistance and longer service life than heat exchangers made from copper pipes, titanium pipes, lead pipes and stainless steel pipes, cooling efficiency of the heat exchanger is equivalent to 90-95% of the efficiency of a copper heat exchanger and use temperature thereof is within the range of minus 40-110 DEG C.
Description
Technical field
The present invention relates to a kind of corrosion resistant composite heat exchanger and preparation method thereof, belong to metal parts surface anticorrosive and technical field of heat exchange; Be particularly useful for when in the technical process of using acid or aqueous slkali in anodic oxidation, differential arc oxidation and the electroplating processes industry temperature requirement being arranged, need with this anticorrosion technical field of heat exchange.
Background technology
In metal parts surface treatment industry, solutions employed has stronger corrosivity for acid or alkaline when carrying out surface treatment such as anodic oxidation, differential arc oxidation or plating; Simultaneously may produce a large amount of heats in the processing procedure, need in time to discharge, perhaps solution need heat and stable maintenance is being higher than the temperature of room temperature, and these all require solution is carried out heat exchange, to reach desired suitable temperature range.
At present, in the surface treatment industry to the heat exchange of solution, as refrigeration, the heat exchanger that generally adopts metal tube such as titanium pipe, lead pipe, stainless steel tube or polytetrafluoroethylene (PTFE) pipe to make.The thermal resistance of metal tube is little, the heat transfer efficiency height, but the corrosive nature of acidproof or alkali is poor, is easily bored a hole by solution corrosion, in case corrosion failure will cause heat exchange facility (as refrigeration machine) to damage.So, replacement cycle is short, and generally do not adopt the direct heat exchanged form, and employing indirect heat exchange mode, as: when the solution in the surperficial treatment trough being freezed with refrigeration machine, earlier non-corrosive water or solution in the refrigeration cooling bay enter the solution that makes in the metal tube in the surface treatment groove with cooled water or solution again and cool.This heat exchange method must make the efficient of heat exchange obviously reduce.The good corrosion resistance of polyfluortetraethylene pipe, but thermal resistance is big, compressive resistance is limited, also can only adopt the indirect heat exchange mode, and cost an arm and a leg.Even if adopt the indirect heat exchange mode, metal tube contacts still with acid-base solution and easily is corroded, and changes comparatively frequently, and the life-span lacks.In addition, the processing technology complexity of metal tube such as titanium pipe, lead pipe, stainless steel tube and polyfluortetraethylene pipe need be carried out operations such as bend pipe and welding, so the cost of manufacture height.
With regard to composite heat exchanger, in order to solve the problem that metal tube easily is corroded, the patent No. is that the Chinese patent of ZL200420034126.2 discloses the corrosion-resistant evaporimeter of a kind of refrigerator, adopt thermoplastic or PUR to cover on the metallic aluminium tube outer surface, again this multiple tube is made evaporation tube, the evaporation plate bonding that evaporation tube and thermoplastic or PUR cover is fixing, becomes the evaporimeter with antiseptic property, and this evaporimeter is used for refrigerator.But because size is little, and the heat exchange action of evaporation tube and refrigerant (gas) is the heat transfer plate heat exchange that covers by thermoplastic or PUR, heat transfer efficiency is lower, thermoplastic or PUR and metal aluminum pipe are compound by extrusion process, technological requirement is higher, is not suitable for having in the surface treatment heat exchange than highly acid or alkaline solution.For satisfying high heat transfer efficient the metal copper pipe is corroded, the patent No. is the Chinese patent of ZL94200437.7, discloses a kind of corrosion-resistant multiple tube refrigerating evaporator.Adopt compound one or more layers other metal material thin layer of copper pipe outer surface of a kind of coil pipe or helix, obtain corrosion resistant metallic diaphragm by plating, coating or method for coating, metallic diaphragm is followed successively by chromium layer, nickel dam and titanium layer, but when being used for the metal parts surface treatment, need bear by this evaporimeter the corrosion of acid or aqueous slkali, its corrosion resistance is nowhere near, and the manufacturing process complexity, the cost height.The polytetrafluoroethylene (PTFE) heat exchanger has good corrosion resistance, obtained application in chemical industry equipment and application industry, but its thermal resistance is bigger, heat transfer property is relatively poor, and obdurability can not directly carry out heat exchange to acid or alkaline solution far below metal tube, can only carry out indirect heat exchange, and cost an arm and a leg.
Summary of the invention
At the problems referred to above, the object of the invention is to provide a kind of good corrosion resistance, heat transfer efficiency height, manufacture craft simple, with low cost, can directly carry out corrosion resistant composite heat exchanger of heat exchange and preparation method thereof to corrosive solution in the metal parts surface treatment.
The objective of the invention is to realize by following technical solution: corrosion resistant composite heat exchanger and preparation method thereof, it comprises the compound heat-exchange tube of skin and hollow metal inner tube layer, it is characterized in that the heat-exchange tube skin is the macromolecular material heat-shrink tube of acid and alkali-resistance solution corrosion, internal layer is good copper pipe of thermal conductivity or aluminum pipe, skin closely is coated on the internal layer surface, can pass through circulating cooling or pyrogenicity medium in the internal layer, the heat absorption in the corrosive solution around the skin can be discharged or heat this solution.
The preparation method of described corrosion resistant composite heat exchanger is at first being through outer macromolecular material heat-shrink tube cover on copper pipe or the aluminum pipe outer surface, reusable heat wind evenly heats this skin successively, its macromolecular material heat-shrink tube skin closely is coated on the outer surface of copper pipe or aluminum pipe, then it is bent to dish type, U-shaped or spirality, it is gripped with at least 1 secondary above grip block and bolt.
Described macromolecular material heat-shrink tube skin is that macromolecule PVC, PTFE, PET, fluorubber, semihard are poly-
A kind of in the vinylidene glue, this outer layer thickness is 0.1～0.5mm.
Described grip block and bolt material are a kind of in macromolecule PVC, PTFE, PET, fluorubber, the semihard Kynoar glue.
Advantage of the present invention is:
The present invention is owing to adopted the macromolecular material PVC of acid-alkali-corrosive-resisting, PTFE, PET, a kind of in fluorubber or the semihard Kynoar glue heat-shrink tube, heat-shrink tube closely is coated on good copper pipe of thermal conductivity or aluminum pipe outer surface through heat shrink, then it is bent to dish type, U-shaped or spirality, with grip block and bolt it is gripped, to increase the technical solution of overall heat transfer area, both solved the problem of composite heat exchanger acid and alkali-resistance solution corrosion, the while good heat conductivity, refrigerating efficiency is 90～95% of a copper heat exchanger, serviceability temperature is in-40～110 ℃ of scopes, the heat exchange effect is good, and the easy bending forming of compound heat-exchange tube, composite bed is cracky not, and is with low cost.
Description of drawings
The present invention will be further described below in conjunction with accompanying drawing and case study on implementation.
Fig. 1 is the front view of coiled corrosion resistant composite heat exchanger.
Fig. 2 is the vertical view of coiled corrosion resistant composite heat exchanger Fig. 1.
Fig. 3 is the cutaway view of coiled corrosion resistant composite heat exchanger Fig. 2 along the A-A line.
Fig. 4 is the front view of U pattern corrosion resistant composite heat exchanger.
Fig. 5 is the vertical view of U pattern corrosion resistant composite heat exchanger Fig. 4.
Fig. 6 is the front view of the fixing corrosion resistant composite heat exchanger of coiled retainer.
Fig. 7 is the vertical view of the fixing corrosion resistant composite heat exchanger Fig. 6 of coiled retainer.
Fig. 8 is the cutaway view of coiled corrosion resistant composite heat exchanger Fig. 6 along the A-A line.
Parts, position and numbering among the figure:
The corrosion-resistant compound heat-exchange tube 2-nut 3-grip block of 1-
The outer 6-internal layer of 4-screw 5-7-retainer
The specific embodiment:
Corrosion resistant composite heat exchanger comprises skin and hollow metal inner tube layer, and skin is the macromolecular material heat-shrink tube layer of acid and alkali-resistance solution corrosion, and internal layer is good copper pipe of thermal conductivity or aluminum pipe, and skin closely is coated on the internal layer surface; Can pass through circulating cooling or pyrogenicity medium in the internal layer, the heat absorption in the corrosive solution around the skin can be discharged or heat this solution.
Corrosion resistant composite heat exchanger of the present invention and preparation method thereof, its internal layer is the copper pipe or the aluminum pipe of hollow, preferably select copper pipe for use, skin is a kind of in PVC, PTFE, PET, fluorubber or the semihard Kynoar glue macromolecular material heat-shrink tube, the acidproof or caustic corrosion of this heat-shrink tube.Making compound heat-exchange tube is that elder generation carries out copper pipe artificial or machinery covers the macromolecular material heat-shrinkable tube, the internal diameter size of this heat-shrinkable tube is than the big 3～8mm of outside dimension of copper pipe, after the process of covering is finished, blow to the other end with hot blast equably along an end of heat-shrinkable tube, heat-shrinkable tube is evenly shunk, and closely be coated on the outer surface of copper pipe or aluminum pipe, form corrosion-resistant skin.This outer layer thickness is 0.1～0.5mm, composite heat exchanger is not corroded in acid or alkaline solution and destroys.Stretch out outside the corrosive solution made two terminations of composite heat exchanger internal layer copper pipe, and with refrigeration machine or heat exchanger by welding or mechanical connection, in the corrosion resistant composite heat exchanger of hollow, feed cold-producing medium or heat agent, can directly carry out heat exchange corrosive solution.More or when needing the amount of heat exchange big as the corrosive solution amount, need to increase the heat exchange area of corrosion resistant composite heat exchanger, can carry out bending, shaping, welding this moment with the copper pipe after closely coating through heat-shrink tube, be formed into plate-like, U type shape or helical form, and after gripping, obtain corrosion resistant composite heat exchanger.In crooked and deformation process, heat-shrink tube closely coats not cracky of the skin that forms behind copper pipe or the aluminum pipe and internal layer, and forming property is good.This method of gripping can be undertaken by dual mode: the PVC plate of (1) employing bar shaped or PTFE plate grip as grip block, and grip block is distributed in the radially both sides of corrosion resistant composite heat exchanger.Corrosion-resistant compound heat-exchange tube after shaping and the arrangement is well put into the grip block that is drilled with some holes, by this hole bolted, play the fixed clamp effect then.Bolt is made with PVC or PTFE.The quantity in hole and size, and the group number of grip block is determined by factors such as the size of corrosion resistant composite heat exchanger, corrosion-resistant compound heat-exchange tube size and coil pipe quantity.(2) according to the shape and size size of corrosion resistant composite heat exchanger, be made into retainer with PVC plate or PTFE plate, multiple tube scratched be entangled on the outer surface again, retainer can play fixation.
Embodiment 1: as Fig. 1, Fig. 2, Figure 3 shows that plate-like formula corrosion resistant composite heat exchanger, be used for the aluminium alloy anode oxide surface treatment.Form by PVC or PTFE heat-shrink tube skin 5, hollow copper pipe internal layer 6, nut 2, screw 4, grip block 3.This skin 5 and internal layer 6 closely coat and form corrosion-resistant compound heat-exchange tube 1.Plate-like formula corrosion resistant composite heat exchanger is placed in the groove that sulfuric acid oxidation solution is housed.As with concentration be 18-26%H
2SO
4Corrosive oxidation liquid about 1 ton carries out heat exchange, make oxidation liquid about 2 hours, drop to-3 ℃ operating temperature from normal temperature (25 ℃), and when anodized, keep the solution operating temperature constant, the external diameter of the hollow copper pipe internal layer 6 in the then corrosion-resistant compound heat-exchange tube 1 is Φ 12mm, and the PVC of its outside suit Φ 16mm or PTFE heat-shrink tube also form corrosion-resistant outer 5 after 180-200 ℃ of hot blast heat shrink.The number of plies of corrosion-resistant compound heat-exchange tube 1 dish is 32 layers and can meets the demands.Adopt the PVC of 4 pairs of 600 * 40 * 20mm or the grip block 3 of PTFE material, and grip by every pair of secondary PVC of 2-3 or PTFE nut 2, screw 4, at the corrosion resistant composite heat exchanger import of plate-like formula and the port of export, after peelling off the length of 100 millimeter with corrosion-resistant outer 5, cover the heat-shrink tube of the same material of 200 millimeters long again, and make it peel off the certain distance in place away from corrosion-resistant outer 5 of compound heat-exchange tube 1.Corrosion-resistant compound heat-exchange tube 1 import and the port of export and welding again after the export and import end of refrigeration machine docks, again the heat-shrink tube that covers is retracted and covers the exposed copper inner tube layer 6 of welding point and the corrosion-resistant compound heat-exchange tube 1 of peelling off skin 5 after the welding, with the corrosion-resistant composite bed that forms after the 180-200 ℃ of hot blast heat shrink.During refrigeration machine work, copper pipe internal layer 6 inner loop of cooling medium fluorine Lyons in corrosion-resistant compound heat-exchange tube 1 make corrosion resistant composite heat exchanger and oxidizing solution carry out the heat exchange refrigeration, and meet the requirements of operating temperature.Corrosion-resistant compound heat-exchange tube 1 import and the port of export should exceed the oxidizing solution surface more than 200 millimeters.
Embodiment 2: be depicted as U pattern corrosion resistant composite heat exchanger as Fig. 3,4,5, be used for the chemical nickel plating surface treatment.U pattern corrosion resistant composite heat exchanger is installed in the electroplating bath, carry out heat exchange with the plating bath about 400 kilograms, can make plating bath about 1 hour, be warmed up to 90 ℃ from normal temperature (25 ℃), and can when Nickel Plating Treatment, keep the plating bath operating temperature constant, determine concrete plating bath operating temperature according to different nickel chemical plating technologies.The external diameter of the copper pipe internal layer 6 in the corrosion-resistant compound heat-exchange tube 1 is Φ 16mm, and its outer surface coats the PTFE heat-shrink tube skin 5 of Φ 20mm, closely is coated on copper pipe surface after 180-200 ℃ of hot blast heat shrink.U pattern corrosion resistant composite heat exchanger crooked U type number be 60, adopt the grip block 3 of the PTFE material of 2 pairs of same sizes to grip by PTFE nut 2 and screw 4, at the corrosion resistant composite heat exchanger import of U pattern and the port of export, after corrosion-resistant outer 5 of corrosion-resistant compound heat-exchange tube 1 peelled off the length of 100 millimeter, cover the PTFE heat-shrink tube of 200 millimeters long again, and make its away from compound heat-exchange tube 1 corrosion-resistant outer 5 peel off the certain distance in place.Export and import end copper nut and screw mechanical splice with the corrosion resistant composite heat exchanger import of U pattern and the port of export and heat exchanger, the exposed copper inner tube layer 6 of corrosion-resistant outer 5 the corrosion-resistant compound heat-exchange tube 1 that again heat-shrink tube that covers is retracted and covers banjo fixing butt jointing after the butt joint and peel off is with the anti-corrosion layer that forms after the 180-200 ℃ of hot blast heat shrink.During heat exchanger work, circulation in the copper pipe internal layer 6 of 98-100 ℃ of deionization hot water in corrosion-resistant compound heat exchange is individual is carried out heat exchange with plating bath, makes the temperature of plating bath meet the requirements of operating temperature.The corrosion resistant composite heat exchanger import of U pattern and the port of export from the height of the corrosion-resistant compound heat-exchange tube 1 of end face more than 200 millimeters.
Embodiment 3: be depicted as the fixing corrosion resistant composite heat exchanger of plate-like formula retainer as Fig. 6,7,8, be used for electroplated chrome surface and handle.The fixing corrosion-resistant compound heat-exchange tube 1 of plate-like formula retainer is installed in the electroplating bath, carry out heat exchange with the chromium plating liquid about 700 kilograms, chromium plating liquid was warmed up to about 70 ℃ from normal temperature (25 ℃) about 1 hour, and can when electrodeposited chromium is handled, keep the chromium plating liquid operating temperature constant, determine concrete chromium plating liquid operating temperature according to different electrodeposited chromium technology.Form by PVC or PTFE heat-shrink tube skin 5, hollow copper pipe internal layer 6, retainer 7.Outer 5 closely coat internal layer 6 shapes forms corrosion-resistant compound heat-exchange tube 1.The external diameter of the hollow copper pipe internal layer 6 in the corrosion-resistant compound heat-exchange tube 1 is Φ 18mm, the PVC of its outside suit Φ 25mm or PTFE heat-shrink tube, and after 180-200 ℃ of hot blast heat shrink, form corrosion-resistant outer 5.The number of plies of corrosion-resistant compound heat-exchange tube 1 dish is 40 layers and can meets the demands, adopt the PVC of 4 pairs of 700 * 40 * 20mm or the grip block 7 of PTFE material, and be maintained fixed by every pair of 2-3 PVC or PTFE nut 2 and screw 4, at plate-like formula retainer fixing the corrosion resistant composite heat exchanger import and the port of export, after peelling off the length of 100 millimeter with corrosion-resistant outer 5, cover the heat-shrink tube of the same material of 200 millimeters long again, and make it peel off the certain distance in place away from corrosion-resistant outer 5 of composite heat exchanger.The corrosion resistant composite heat exchanger import that plate-like formula retainer is fixing and the port of export with weld again after the export and import end of heat exchanger docks, again the heat-shrink tube that covers is retracted and covers the exposed copper inner tube layer 6 of welding point and the corrosion resistant composite heat exchanger of peelling off skin 5 after the welding, with forming corrosion-resistant outer 5 after the 180-200 ℃ of hot blast heat shrink.During heat exchanger work, copper pipe internal layer 6 inner loop of 95-100 ℃ of deionization hot water in composite heat exchanger, fixing corrosion resistant composite heat exchanger and the electroplate liquid of plate-like formula retainer carries out heat exchange, makes electroplate liquid meet the requirements of operating temperature.The corrosion resistant composite heat exchanger import that plate-like formula retainer is fixing and the port of export should exceed the electroplate liquid surface more than 200 millimeters.
Claims (4)
1, the present invention relates to a kind of corrosion resistant composite heat exchanger and preparation method thereof, it comprises the compound heat-exchange tube of skin and hollow metal inner tube layer, it is characterized in that the heat-exchange tube skin is the macromolecular material heat-shrink tube of acid and alkali-resistance solution corrosion, internal layer is good copper pipe of thermal conductivity or aluminum pipe, skin closely is coated on the internal layer surface, can pass through circulating cooling or pyrogenicity medium in the internal layer, the heat absorption in the corrosive solution around the skin can be discharged or heat this solution.
2, corrosion resistant composite heat exchanger according to claim 1 and preparation method thereof, it is characterized in that preparation method is at first being through outer macromolecular material heat-shrink tube cover on copper pipe or the aluminum pipe outer surface, reusable heat wind evenly heats this skin successively, its macromolecular material heat-shrink tube skin closely is coated on the outer surface of copper pipe or aluminum pipe internal layer, then it is bent to dish type, U-shaped or spirality, it is gripped with at least 1 secondary above grip block and bolt.
3, macromolecular material heat-shrink tube according to claim 1 and 2 is characterized in that outer a kind of in macromolecule PVC, PTFE, PET, fluorubber, the semihard Kynoar glue of macromolecular material heat-shrink tube, and this outer layer thickness is 0.1～0.5mm.
4, grip block according to claim 2 and bolt, the material that it is characterized in that grip block and bolt are a kind of in PVC, PTFE, PET, fluorubber, the semihard Kynoar glue.
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| CNA2009100580631A CN101493298A (en) | 2009-01-08 | 2009-01-08 | Corrosion resistant composite heat exchanger and method for producing the same |
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| CNA2009100580631A CN101493298A (en) | 2009-01-08 | 2009-01-08 | Corrosion resistant composite heat exchanger and method for producing the same |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102104165A (en) * | 2011-01-26 | 2011-06-22 | 上海林洋储能科技有限公司 | Positive-displacement radiating equipment used for flow battery |
| CN102110830A (en) * | 2011-01-26 | 2011-06-29 | 上海林洋储能科技有限公司 | Volume heat exchange equipment for flow battery |
| CN102605404A (en) * | 2012-04-19 | 2012-07-25 | 广东永利坚铝业有限公司 | Heat exchange method and device for anode oxidation groove liquid of aluminum profile |
| CN104655550A (en) * | 2015-02-13 | 2015-05-27 | 华南理工大学 | Method for detecting corrosion resistance of metal plastic composite material |
| CN105437531A (en) * | 2015-12-24 | 2016-03-30 | 平高集团有限公司 | Method for sleeving branch row of switch cabinet with heat shrink tube, and branch row of switch cabinet |
| CN108088019A (en) * | 2017-12-18 | 2018-05-29 | 大连通亚重工有限公司 | A kind of portable air heat exchange system |
| CN108106458A (en) * | 2017-12-18 | 2018-06-01 | 大连通亚重工有限公司 | A kind of hot-air system |
| CN110023077A (en) * | 2016-11-29 | 2019-07-16 | 韦文有限公司 | The purposes of multilayer pipe and multilayer pipe |
| CN110174312A (en) * | 2019-05-27 | 2019-08-27 | 雅砻江流域水电开发有限公司 | A kind of device and film covering method suitable for high temperature and pressure test |
| CN111964513A (en) * | 2020-08-27 | 2020-11-20 | 江苏康泰热交换设备工程有限公司 | Heat exchange method of microchannel wet film heat exchanger |
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2009
- 2009-01-08 CN CNA2009100580631A patent/CN101493298A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102104165A (en) * | 2011-01-26 | 2011-06-22 | 上海林洋储能科技有限公司 | Positive-displacement radiating equipment used for flow battery |
| CN102110830A (en) * | 2011-01-26 | 2011-06-29 | 上海林洋储能科技有限公司 | Volume heat exchange equipment for flow battery |
| CN102605404A (en) * | 2012-04-19 | 2012-07-25 | 广东永利坚铝业有限公司 | Heat exchange method and device for anode oxidation groove liquid of aluminum profile |
| CN104655550A (en) * | 2015-02-13 | 2015-05-27 | 华南理工大学 | Method for detecting corrosion resistance of metal plastic composite material |
| CN104655550B (en) * | 2015-02-13 | 2018-01-05 | 华南理工大学 | A kind of corrosion resistance detection method of plastimets |
| CN105437531A (en) * | 2015-12-24 | 2016-03-30 | 平高集团有限公司 | Method for sleeving branch row of switch cabinet with heat shrink tube, and branch row of switch cabinet |
| CN105437531B (en) * | 2015-12-24 | 2018-07-20 | 平高集团有限公司 | A kind of switchgear branch row is set with method and the switchgear branch row of heat-shrink tube |
| CN110023077A (en) * | 2016-11-29 | 2019-07-16 | 韦文有限公司 | The purposes of multilayer pipe and multilayer pipe |
| CN108088019A (en) * | 2017-12-18 | 2018-05-29 | 大连通亚重工有限公司 | A kind of portable air heat exchange system |
| CN108106458A (en) * | 2017-12-18 | 2018-06-01 | 大连通亚重工有限公司 | A kind of hot-air system |
| CN110174312A (en) * | 2019-05-27 | 2019-08-27 | 雅砻江流域水电开发有限公司 | A kind of device and film covering method suitable for high temperature and pressure test |
| CN111964513A (en) * | 2020-08-27 | 2020-11-20 | 江苏康泰热交换设备工程有限公司 | Heat exchange method of microchannel wet film heat exchanger |
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Open date: 20090729 |