CN103322833A - Heat exchanger with high heat exchange efficiency and long service life - Google Patents

Heat exchanger with high heat exchange efficiency and long service life Download PDF

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Publication number
CN103322833A
CN103322833A CN2013102434778A CN201310243477A CN103322833A CN 103322833 A CN103322833 A CN 103322833A CN 2013102434778 A CN2013102434778 A CN 2013102434778A CN 201310243477 A CN201310243477 A CN 201310243477A CN 103322833 A CN103322833 A CN 103322833A
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CN
China
Prior art keywords
steel
heat exchanger
steel pipe
heat exchange
hemispherical dome
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Pending
Application number
CN2013102434778A
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Chinese (zh)
Inventor
黄恩民
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Shanghai Baosteel Energy Service Co Ltd
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Shanghai Baosteel Energy Service Co Ltd
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Publication date
Application filed by Shanghai Baosteel Energy Service Co Ltd filed Critical Shanghai Baosteel Energy Service Co Ltd
Priority to CN2013102434778A priority Critical patent/CN103322833A/en
Publication of CN103322833A publication Critical patent/CN103322833A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a heat exchanger. Flow guide steel plates are additionally arranged on a fitting between square and circle ducts of an air inlet of a large steel tube heat exchanger, on a fitting between square and circle ducts of an air outlet of the large steel tube heat exchanger and in a lower header, fins are wound outside heat exchange steel tubes, inner inserts are inserted into the steel tubes, the heat exchanger solves the problem that the heat exchange steel tubes on the periphery of a steel tube bundle heat exchange header are easily burned out due to uneven flow volume of air in the heat exchange steel tubes of the large steel tube heat exchanger, the problem of low heat exchange efficiency of the steel tubes is solved, the service life of the heat exchanger is reliably prolonged, and the heat exchange efficiency of the heat exchanger is reliably improved.

Description

The heat exchanger that a kind of heat exchange efficiency is high, the life-span is long
Technical field
The present invention relates to the design of heat exchanger field, the heat exchanger that particularly a kind of heat exchange efficiency that obtains by architecture advances is high, the life-span is long.
Background technology
Steel Pipe Heat Exchanger is the capital equipment that reclaims various heating furnace kiln flue gas heat, is applied to the fields such as Ferrous Metallurgy, nonferrous metallurgy, chemical industry, building materials.
The using method of Steel Pipe Heat Exchanger: generally Steel Pipe Heat Exchanger is placed in the flue, flue gas flows between the heat exchange steel tube of Steel Pipe Heat Exchanger, the heat transferred steel pipe of flue gas, air flows in the heat exchange steel tube of Steel Pipe Heat Exchanger, the heat transferred air of steel pipe, finish the heat transfer process of flue gas → steel pipe → air, the waste heat that is about to flue gas passes to air through Steel Pipe Heat Exchanger, finishes the recovery of fume afterheat.
Usually, the flue-gas temperature of Rolling Steel in Steel Works formula heating furnace all installs the waste heat that Steel Pipe Heat Exchanger comes recovered flue gas additional at 700~850 ℃ in the heating furnace flue, is used for coal gas and the air of heating heating furnace burning usefulness.
The form of steel rolling formula steel tube for fired heater heat exchanger generally is the light pipe heat exchanger, and the combining form of two strokes and four-stroke is arranged.
Heat exchange steel tube material according to Steel Pipe Heat Exchanger is divided, carbon steel 20g Steel Pipe Heat Exchanger, heat resisting steel 1Gr18Ni9Ti Steel Pipe Heat Exchanger, heat resisting steel Cr25Ni20 Steel Pipe Heat Exchanger, steel surface aluminising heat exchanger are arranged, and these heat exchangers are used in the heating furnace high-temperature flue gas respectively and are obtained good effect.
Steel Pipe Heat Exchanger is comprised of air intlet hemispherical dome, air outlet slit hemispherical dome, lower collecting box and two steel pipe tube bank heat exchange headers (being designated as steel pipe tube bank heat exchange header one and steel pipe tube bank heat exchange header two).The stroke of flue gas is that level is passed through two heat exchange headers, and the stroke of air is to enter successively the air intlet hemispherical dome through air duct, steel pipe tube bank heat exchange header one, lower collecting box, steel pipe tube bank heat exchange header two is pooled to the air outlet slit hemispherical dome again, then enters hot air duct.
The damage of finding in process of production some large-scale steel pipe heat exchanger has certain rule, be exactly near steel pipe tube bank heat exchange header Air is imported and exported center line steel pipe substantially intact, many four jiaos of steel pipe tube bank heat exchange header and surrounding steel pipe scaling loss quantity, damaged condition is obvious.And this situation occurs in the large-scale steel pipe heat exchanger of many heating furnaces.
Study discovery for these heat exchangers, the height of air intlet hemispherical dome is at 400~500mm, about it circular diameter/place (long or wide)=1:3, and the air velocity in the air duct is at 10~12 meter per seconds, air enters behind the hemispherical dome because the effect of moving head like this, near the air duct center line steel pipe air mass flow than around the steel pipe constriction case and the air mass flow in the steel pipe of surrounding many, like this around the steel pipe constriction case and the air mass flow in the steel pipe of surrounding few, the steel pipe walls excess Temperature causes the heat exchange steel tube scaling loss.
Summary of the invention
The invention provides the heat exchanger that a kind of heat exchange efficiency is high, the life-span is long, this heat exchanger installs respectively the water conservancy diversion steel plate additional in its air intlet hemispherical dome and air outlet slit hemispherical dome He in the lower collecting box, be conducive to heat exchanger steel tube Air amount of flow even, effectively stop since in the heat exchanger steel tube Air Flow inhomogeneous, and cause low problem of heat exchange steel tube life-span around the heat exchange header.In addition, heat exchange steel tube twines fin outward, increase the heat exchange area of heat exchanger, the inner spiral plug-in part of installing, increase the turbulence level that the heat exchange steel tube inner air flows, destroy the boundary-layer of Air Flow in the heat exchange steel tube, improve the heat exchange efficiency that overall heat-transfer coefficient improves heat exchanger, to solve defects of the prior art.
The principle that the present invention improves heat exchange efficiency is:
The heat exchange efficiency that improves Steel Pipe Heat Exchanger is the important means of effective recovered flue gas heat, and the computing formula of the heat that heat exchanger reclaims is as follows:
Q=F×K×△t p
In the formula: Q-is preheated the heat that gas needs, i.e. the heat of heat exchanger recovery, and kilojoule/hour
F-heat exchanger heat exchange area, m 2
The K-total exchange coefficient of the heat exchanger, kilojoule/rice 2Hour ℃
△ t pThe logarithmic mean temperature difference (LMTD) of-flue gas and air, ℃
Can find out that the heat that heat exchanger reclaims is directly proportional with the heat exchanger heat exchange area, and the total heat transfer coefficient of heat exchanger is directly proportional.Aspect the heat exchange area that increases heat exchanger, be limited by the quantity that increases the Steel Pipe Heat Exchanger steel pipe only, the quantity of steel pipe is limited by the many factors such as flue size, flue draft, changes to get up to need to consider many factors, very complex.Can enlarge the heat exchanger tube heat exchange area by twine the method for metal fin at outer surface of steel tube, under the prerequisite that steel pipe quantity does not increase, improve the heat exchange area of heat exchange steel tube, thereby improve the heat exchange amount.
Improve total exchange coefficient of the heat exchanger, the recovery that can improve heat.Air flows in steel pipe, owing to being steady-flow, so form boundary-layer on the steel pipe inner wall surface, the speed of Air Flow levels off to 0 meter per second in boundary-layer, causes steel pipe walls to be conducted heat large to the thermal resistance of air, and the heat of transmission diminishes.The boundary-layer of eliminating the steel pipe inner wall air can make air disorderly attitude in steel pipe flow, and increases heat transfer coefficient.Therefore in steel pipe, install the spiral plug-in part additional, destroy the interior boundary-layer of pipe to form turbulent flow, improve total exchange coefficient of the heat exchanger, improve heat transfer efficiency.
Technical scheme of the present invention is as follows:
A kind of heat exchanger, it is comprised of air intlet hemispherical dome, lower collecting box and two steel pipe tube bank heat exchange headers, air outlet slit hemispherical domes, in the described air intlet hemispherical dome, in the air outlet slit hemispherical dome and in the lower collecting box some water conservancy diversion steel plates are set respectively.
In preferred embodiment of the present invention, be provided with the spiral plug-in part in the steel pipe of described steel pipe tube bank heat exchange header.In an embodiment disclosed by the invention, arranging of spiral plug-in part is set in the described steel pipe can be the steel band that adopts narrow 2 mm of Width pipe diameter, the length of steel band equals the length of steel pipe, bore a hole at steel band one end 10 mm places, bore dia is 6 mm, and steel band is turned 180 ° every 130 mm, and the rotation plug-in part of making is put into steel pipe, be that to insert diameter be the reinforcing bar of 5 mm the hole place of 6 mm at diameter, the two-end-point of described reinforcing bar is welded in the termination of steel pipe.
In preferred embodiment of the present invention, the steel pipe of described steel pipe tube bank heat exchange header twines fin outward.In one embodiment of this invention, described steel pipe twine outward fin arrange can for: adopt thick 1.0 mm of wide 18 mm band steel to be wrapped on the outer surface of steel tube winding pitch 15~20 mm.
In one embodiment of the invention, in the described air intlet hemispherical dome and in the air outlet slit hemispherical dome four water conservancy diversion steel plates are set respectively.
Preferred described water conservancy diversion steel plate is separately positioned on the place of area five five equilibriums at the round mouth place of air intlet hemispherical dome and air outlet slit hemispherical dome and square opening place, hemispherical dome is separated into five air ducts that independence is not connected, on the same day circularly square steel plate employing continuity welding manner, the lower limb of water conservancy diversion steel plate and the welding of steel pipe tube bank heat exchange header casing continuity of water conservancy diversion steel plate of separating usefulness.
Preferred described water conservancy diversion steel plate is the 3mm steel plate, mates with air intlet hemispherical dome and air outlet slit hemispherical dome with existing heat exchanger.
In preferred embodiment of the present invention, the water conservancy diversion steel plate in the described lower collecting box is the U-shaped steel plate that adds therebetween, and described U-shaped steel plate is divided into two not connected parts with lower collecting box.
Compared with prior art, beneficial effect of the present invention is as follows:
The one, the present invention is installed the water conservancy diversion steel plate additional in the air intlet hemispherical dome of heat exchanger and air outlet slit hemispherical dome and in the lower collecting box, be conducive to heat exchanger steel tube Air amount of flow even, effectively stopped since in the heat exchanger steel tube Air Flow inhomogeneous, and cause low problem of heat exchange steel tube life-span around the heat exchanger header;
The heat exchange steel tube of the 2nd, heat exchanger of the present invention twines fin outward, increased the heat exchange area of heat exchanger, and the inner spiral plug-in part of installing, increased the turbulence level that the heat exchange steel tube inner air flows, destroy the boundary-layer of Air Flow in the heat exchange steel tube, improve the overall heat-transfer coefficient of heat exchanger, and then improve the heat exchange efficiency of heat exchanger;
The 3rd. the Steel Pipe Heat Exchanger that installs water conservancy diversion steel plate and outer fin, plug-in part additional of the present invention, long service life, and improved the rate of recovery of flue gas heat.
Certainly, implement arbitrary product of the present invention and might not need to reach simultaneously above-described all advantages.
Description of drawings
Fig. 1 is the heat exchanger of the embodiment of the invention 1 and the structural representation of water conservancy diversion steel plate;
Fig. 2 is the schematic diagram of the steel pipe that is provided with spiral plug-in part and outer spiral fin of the embodiment of the invention 1.
Wherein, number in the figure 1. air intlet hemispherical domes; 2. lower collecting box; 3. air outlet slit hemispherical dome; 4. steel pipe tube bank heat exchange header one; 5. steel pipe tube bank heat exchange header two; 6. water conservancy diversion steel plate; 7.U type water conservancy diversion steel plate; 8. spiral plug-in part; 9. seamless steel pipe; 10. outer spiral fin.
The specific embodiment
The present invention adds deflector in the air intlet hemispherical dome of large-scale steel pipe heat exchanger and air outlet slit hemispherical dome and lower collecting box, with outside heat exchange steel tube, twine fin, add plug-in part in the steel pipe, solved because the interior air flow amount of large-scale steel pipe heat exchanger heat exchange steel tube is inhomogeneous, and the problem of the easy scaling loss of heat exchange steel tube around the steel pipe that the produces tube bank heat exchange header, and the low problem of steel pipe heat exchange efficiency, provide reliable way for increasing the heat exchanger life-span and improving the heat exchanger heat exchange efficiency.The present invention will be further described in conjunction with a specific embodiment in the below.
Embodiment 1
Referring to Fig. 1 and Fig. 2, the heat exchanger of the high heat exchange efficiency that the present embodiment provides, it is comprised of air intlet hemispherical dome 1, lower collecting box 2 and two steel pipe tube bank heat exchange headers, air outlet slit hemispherical domes 3, wherein, two steel pipe tube bank heat exchange headers are respectively steel pipe tube bank heat exchange header 1 and steel pipe tube bank heat exchange header 25, in the air intlet hemispherical dome 1, air outlet slit hemispherical dome 3 is interior that some water conservancy diversion steel plates 6 are set respectively, lower collecting box 2 is interior to arrange U-shaped water conservancy diversion steel plate 7.In the present invention, the quantity of water conservancy diversion steel plate does not specifically limit, as long as can improve the inhomogeneous problem of heat exchanger steel tube Air amount of flow.
In addition in the present embodiment, in order to reach better heat transfer effect, all the steel pipe 9 outer fins 10 that all twine two steel pipe tube bank heat exchange headers are provided with spiral plug-in part 8 in all steel pipes 9.Certainly, in other embodiment of the present invention, can only outside the part steel pipe, twine fin and the spiral plug-in part is set.
Find through great many of experiments, one of preferred version of the present invention is, in the air intlet hemispherical dome 1 and air outlet slit hemispherical dome 3 is interior that four water conservancy diversion steel plates 6 are set respectively.Water conservancy diversion steel plate 6 the place that can be separately positioned on for: those water conservancy diversion steel plates 6 area five five equilibriums at the round mouth place of air intlet hemispherical dome 1 and air outlet slit hemispherical dome 3 and square opening place specifically is set, hemispherical dome is separated into five air ducts that independence is not connected, on the same day circularly square steel plate employing continuity welding manner, the lower limb of water conservancy diversion steel plate 6 and the welding of steel pipe tube bank heat exchange header casing continuity of water conservancy diversion steel plate 6 of separating usefulness.Concrete operations can for: at round mouth place and the square opening place of Steel Pipe Heat Exchanger air intlet hemispherical dome 1 and air outlet slit hemispherical dome 3, divide (see figure 1) with its area 5 grades, add 3mm water conservancy diversion steel plate at circle and square bisector joint face place, hemispherical dome is separated into 5 air ducts that independence is not connected, wherein 3mm water conservancy diversion steel plate on the same day circularly the square steel plate adopt the continuity welding manner, the lower limb of water conservancy diversion steel plate and the welding of heat-exchanging tube bundle casing continuity, the air capacity equalization that can guarantee like this to enter heat exchange box 5 five equilibriums.
In the present embodiment, the water conservancy diversion steel plate in the preferred lower collecting box 2 is the U-shaped steel plate 7 that adds therebetween, and U-shaped steel plate 7 is divided into two not connected parts with lower collecting box 2, is conducive to the Uniform Flow of air in the pipeline
The mode of steel pipe 9 outer winding fins can be: adopt the thick 1.0mm band of wide 18mm steel to be wrapped on the outer surface of steel tube, and winding pitch 15~20mm, the steel pipe surface area increases by 6~8 times like this, has greatly increased heat exchange area.Preferred this fin is outer spiral fin.
The steel pipe 9 interior modes that the spiral plug-in part is set can be: establishing pipe diameter is a mm, adopts the steel band of width (a-2) mm, and the length of steel band equals the length b mm of steel pipe.In steel band one end 10 mm places perforation, bore dia φ 6 mm turn 180 ° with steel band every 130 mm, and steel pipe is put into the rotation plug-in part 8 of making in corotation b/130 * 180 °, and the reinforcing bar two-end-point that inserts φ 5 mm at place, φ 6 mm holes is welded in the termination of steel pipe.Single so outer fin plug-in part heat exchange steel tube completes.The steel pipe 9 interior structures of screw thread plug-in part 8 and outer spiral fin 10 that arrange are referring to Fig. 2.Wherein, for a concrete Steel Pipe Heat Exchanger, the length of its pipe diameter and steel pipe all is known, and therefore above each numerical value all can be obtained by simple computation.
Have N row M and list and state the heat exchange steel tube that is provided with outer fin plug-in part and form steel pipe tube bank heat exchange header, two heat exchange headers and two hemispherical domes and lower collecting box consist of an outer fin plug-in part Steel Pipe Heat Exchanger of the present embodiment.
The above disclosed preferred embodiment of the present invention just is used for helping to set forth the present invention.Preferred embodiment does not have all details of detailed descriptionthe, does not limit this invention yet and only is the described specific embodiment.Obviously, according to the content of this specification, can make many modifications and variations.These embodiment are chosen and specifically described to this specification, is in order to explain better principle of the present invention and practical application, thereby the technical field technical staff can understand and utilize the present invention well under making.The present invention only is subjected to the restriction of claims and four corner and equivalent.

Claims (9)

1. heat exchanger, it is comprised of air intlet hemispherical dome, lower collecting box and two steel pipe tube bank heat exchange headers, air outlet slit hemispherical domes, it is characterized in that, in the described air intlet hemispherical dome, in the air outlet slit hemispherical dome and in the lower collecting box some water conservancy diversion steel plates are set respectively.
2. heat exchanger as claimed in claim 1 is characterized in that, is provided with the spiral plug-in part in the steel pipe of described steel pipe tube bank heat exchange header.
3. heat exchanger as claimed in claim 1 or 2 is characterized in that, the steel pipe of described steel pipe tube bank heat exchange header twines fin outward.
4. heat exchanger as claimed in claim 1 is characterized in that, in the described air intlet hemispherical dome and in the air outlet slit hemispherical dome four water conservancy diversion steel plates is set respectively.
5. heat exchanger as claimed in claim 4, it is characterized in that, described water conservancy diversion steel plate is separately positioned on the place of area five five equilibriums at the round mouth place of air intlet hemispherical dome and air outlet slit hemispherical dome and square opening place, hemispherical dome is separated into five air ducts that independence is not connected, on the same day circularly square steel plate employing continuity welding manner, the lower limb of water conservancy diversion steel plate and the welding of steel pipe tube bank heat exchange header casing continuity of water conservancy diversion steel plate of separating usefulness.
6. such as claim 4 or 5 described heat exchangers, it is characterized in that, described water conservancy diversion steel plate is the 3mm steel plate.
7. heat exchanger as claimed in claim 1 is characterized in that, the water conservancy diversion steel plate in the described lower collecting box is the U-shaped steel plate that adds therebetween, and described U-shaped steel plate is divided into two not connected parts with lower collecting box.
8. heat exchanger as claimed in claim 2, it is characterized in that, the set-up mode of the spiral plug-in part in the described steel pipe is: the steel band that adopts the narrow 2mm of Width pipe diameter, the length of steel band equals the length of steel pipe, and in the perforation of steel band one end 10mm place, bore dia is 6mm, steel band is turned 180 ° every 130mm, the rotation plug-in part of making is put into steel pipe, is that to insert diameter be the reinforcing bar of 5mm the hole place of 6mm at diameter, and the two-end-point of described reinforcing bar is welded in the termination of steel pipe.
9. heat exchanger as claimed in claim 3 is characterized in that, described steel pipe twines being set to of fin outward: adopt the thick 1.0mm band of wide 18mm steel to be wrapped on the outer surface of steel tube winding pitch 15~20mm.
CN2013102434778A 2013-06-19 2013-06-19 Heat exchanger with high heat exchange efficiency and long service life Pending CN103322833A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104763517A (en) * 2015-03-26 2015-07-08 清华大学 Intercooler
CN105043144A (en) * 2015-06-12 2015-11-11 西安交通大学 Double-side etching high-temperature and high-pressure printed circuit board heat exchanger
CN104197771B (en) * 2014-09-12 2016-01-20 甘肃蓝科石化高新装备股份有限公司 A kind of current equalizing structure for heat exchanger plate bundle gas access
CN105627790A (en) * 2014-11-25 2016-06-01 江苏恒力达机械有限公司 Air heat exchanger
CN108007244A (en) * 2017-11-27 2018-05-08 西安交通大学 A kind of spiral plug-flow passage plate heat exchanger

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Publication number Priority date Publication date Assignee Title
US5150573A (en) * 1987-10-02 1992-09-29 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Catalyst arrangement with flow guide body
CN101147039A (en) * 2005-03-24 2008-03-19 贝尔两合公司 Exhaust gas heat exchanger, in particular an exhaust gas cooler for exhaust gas recirculation in a motor vehicle
CN102042075A (en) * 2010-12-16 2011-05-04 浙江大学 Vehicle intercooler based on heat medium splitting technology
CN102062551A (en) * 2011-01-19 2011-05-18 河北工程大学 Fluid heat exchanger
CN202092503U (en) * 2011-03-15 2011-12-28 鞍山经济开发区东大热工技术研究所 Smoke heat exchanger
CN202709806U (en) * 2012-03-14 2013-01-30 郭楚昊 Tubular heat exchanger
CN203443422U (en) * 2013-06-19 2014-02-19 上海宝钢节能技术有限公司 Heat exchanger high in heat exchange efficiency and long in service life

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5150573A (en) * 1987-10-02 1992-09-29 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Catalyst arrangement with flow guide body
CN101147039A (en) * 2005-03-24 2008-03-19 贝尔两合公司 Exhaust gas heat exchanger, in particular an exhaust gas cooler for exhaust gas recirculation in a motor vehicle
CN102042075A (en) * 2010-12-16 2011-05-04 浙江大学 Vehicle intercooler based on heat medium splitting technology
CN102062551A (en) * 2011-01-19 2011-05-18 河北工程大学 Fluid heat exchanger
CN202092503U (en) * 2011-03-15 2011-12-28 鞍山经济开发区东大热工技术研究所 Smoke heat exchanger
CN202709806U (en) * 2012-03-14 2013-01-30 郭楚昊 Tubular heat exchanger
CN203443422U (en) * 2013-06-19 2014-02-19 上海宝钢节能技术有限公司 Heat exchanger high in heat exchange efficiency and long in service life

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104197771B (en) * 2014-09-12 2016-01-20 甘肃蓝科石化高新装备股份有限公司 A kind of current equalizing structure for heat exchanger plate bundle gas access
CN105627790A (en) * 2014-11-25 2016-06-01 江苏恒力达机械有限公司 Air heat exchanger
CN104763517A (en) * 2015-03-26 2015-07-08 清华大学 Intercooler
CN104763517B (en) * 2015-03-26 2017-06-23 清华大学 Charge air cooler
CN105043144A (en) * 2015-06-12 2015-11-11 西安交通大学 Double-side etching high-temperature and high-pressure printed circuit board heat exchanger
CN108007244A (en) * 2017-11-27 2018-05-08 西安交通大学 A kind of spiral plug-flow passage plate heat exchanger
CN108007244B (en) * 2017-11-27 2019-08-23 西安交通大学 A kind of spiral plug-flow channel plate heat exchanger

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Application publication date: 20130925