CN109827335B - Full-modularized flue type extruded aluminum condensation heat exchanger - Google Patents
Full-modularized flue type extruded aluminum condensation heat exchanger Download PDFInfo
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- CN109827335B CN109827335B CN201910218243.5A CN201910218243A CN109827335B CN 109827335 B CN109827335 B CN 109827335B CN 201910218243 A CN201910218243 A CN 201910218243A CN 109827335 B CN109827335 B CN 109827335B
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 154
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 154
- 238000009833 condensation Methods 0.000 title claims abstract description 10
- 230000005494 condensation Effects 0.000 title claims abstract description 10
- 238000001125 extrusion Methods 0.000 claims abstract description 76
- 238000007789 sealing Methods 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000005482 strain hardening Methods 0.000 claims description 96
- 210000001503 joint Anatomy 0.000 claims description 24
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 23
- 239000003546 flue gas Substances 0.000 claims description 23
- 239000000779 smoke Substances 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims description 14
- 239000010935 stainless steel Substances 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- -1 aluminum silicon magnesium Chemical compound 0.000 claims description 8
- 238000012546 transfer Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 239000008399 tap water Substances 0.000 claims description 4
- 235000020679 tap water Nutrition 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 230000032683 aging Effects 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910001566 austenite Inorganic materials 0.000 claims description 3
- 229910001039 duplex stainless steel Inorganic materials 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000012173 sealing wax Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000009991 scouring Methods 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- 239000001993 wax Substances 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims 2
- 238000005728 strengthening Methods 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 6
- 238000003466 welding Methods 0.000 abstract description 6
- 238000005336 cracking Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 18
- 239000007789 gas Substances 0.000 description 15
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 239000003345 natural gas Substances 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000008236 heating water Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Abstract
A full-modularized flue type extruded aluminum condensation heat exchanger comprises a plurality of extruded aluminum heat exchange unit elements, a plurality of cold medium flow elements, an upper end isobaric flue, a dew bearing plate, a header and a sealing cover plate; the extruded aluminum heat exchange unit adopts a high-efficiency mature extruded aluminum process, and has a stable connection, positioning and sealing structure and excellent heat exchange performance due to an excellent structural design; the axisymmetric or centrosymmetric comb-tooth-shaped inner fin structure and the surface corrugation are adopted to optimize the temperature field distribution and enlarge the effective heat exchange area; heat exchangers with various sizes can be configured according to heat exchange power and site requirements, so that the heat exchangers are flexible and various; the energy cascade utilization can be realized by selecting a double water channel mode and improving the heat exchange efficiency by matching with a heat pump unit or directly supplying domestic hot water; the whole bolt is connected, the sealing is reliable, the disassembly and the maintenance are convenient, and meanwhile, a welding process can be adopted to prevent the occurrence of stress corrosion cracking; the modularized flue type extrusion aluminum heat exchanger adopts an extrusion process, has excellent performance and price advantage.
Description
Technical Field
The invention belongs to the field of heat exchangers for improving energy utilization efficiency, saving energy and protecting environment, and particularly relates to a full-modularized flue type extruded aluminum condensation heat exchanger.
Background
In recent years, the global energy problem is increasingly highlighted, the non-renewable nature of fossil energy determines that energy conservation and environmental protection are important problems facing human beings, and high-efficiency energy conservation and environmental protection become the development direction of global energy utilization. China is a large country for energy production and consumption, and energy conservation, emission reduction and energy utilization efficiency improvement are faced by usImportant tasks are that the environmental management in China is strictly controlled, the haze problem is continuous and frequent, and the haze phenomenon between heating seasons in the north is more serious. In order to treat haze, the heating industry provides a cleaning heating plan in winter 2017-2021 in northern area, wherein the cleaning heating rate in 2019 is 50% instead of 0.74 hundred million tons of scattered coal, and 131 hundred million meters of new gas is added 3 The method comprises the steps of carrying out a first treatment on the surface of the Clean heating rate of 70% in 2021 replaces 1.5 hundred million tons of scattered coal, and newly increased gas is 278 hundred million m 3 The method comprises the steps of carrying out a first treatment on the surface of the The demand of 2021 heating natural gas reaches 641 hundred million m 3 The above requirements and the like. In order to meet the planning requirement, a commercial gas heating stove burning natural gas is necessary as a distributed heating mode, and the commercial gas heating stove is a supply terminal for converting chemical energy of the natural gas into heat energy to realize heating and is the best choice of distributed heating. The emerging cast aluminum silicon magnesium modularized commercial gas heating furnace which is put forward in the market at present has higher efficiency, compact structure, expensive die and material price, extremely limited national production capacity and controlled core technology abroad; the commercial gas heating furnaces for cast iron and welded stainless steel are low in efficiency, large in size and heavy, and Stress Corrosion Cracking (SCC) can occur under the dual actions of condensate water active ions and welding residual stress after the commercial gas heating furnaces for stainless steel adopt a welding process; although the all-copper commercial gas heating furnace has excellent heat conduction performance, high price and low strength, the corrosion-resistant coating on the surface of the all-copper pipe is easy to peel off, so that the condensate corrosion problem is serious, and various factors of copper resource deficiency in China determine that the all-copper commercial gas heating furnace is not suitable for vigorous development; the traditional steel large-volume natural gas hot water boiler in early stage of China has low cost but high exhaust temperature, has general investigation and display that the exhaust temperature of a household hot water heating dual-purpose water heater/boiler is above 120 ℃, the exhaust temperature of a gas heating boiler is generally above 150-250 ℃, the exhaust temperature of an industrial boiler is above 200-260 ℃ (such as an oilfield steam injection boiler), the exhaust temperature of an electric boiler of a gas-steam combined cycle is still above 180 ℃, the volume fraction of water vapor in the exhaust gas generated by the natural gas boiler is 15-20%, and the higher exhaust temperature can cause the common loss of sensible heat and latent heat, so that the huge energy waste and environmental pollution are caused.
The extrusion aluminum process in China is mature, the section is stretched in one-dimensional direction of the extrusion section, the section is cut randomly according to the length of the heat exchanger, the structure is simple, the production efficiency is high, the service life of the extrusion die is short, the updating is quick, the price is low, the updating speed of the extrusion aluminum heat exchange unit element can be easily realized, the heat exchange power specification is complete, the market adaptability is strong, the production cost is extremely low, the heat conductivity coefficient of aluminum-silicon-magnesium extruded aluminum material is high, the strength is high, and the acid corrosion resistance is excellent after the anodic oxidation treatment process is carried out, so that the extrusion aluminum heat exchanger is an ideal process for manufacturing and producing the heat exchanger. The novel natural gas boiler can be produced in a coupling way with a boiler main body, and meanwhile, the modularized flue type extruded aluminum heat exchange energy saver can be additionally arranged at the tail part of the boiler to reduce the exhaust gas temperature, so that the boiler efficiency is improved, and the flexible arrangement, high efficiency, energy saving, low cost and other effective advantages mark that the extruded aluminum heat exchanger has huge market demands and development prospects.
Disclosure of Invention
In order to solve the problems of high exhaust gas temperature, low thermal efficiency and the like of the traditional large-volume commercial gas heating water heater, and to be different from other various commercial gas heating water heaters, the invention provides a full-modularized flue type extruded aluminum condensing heat exchanger which is produced by adopting a mature and efficient extruded aluminum process.
The invention is realized by the following technical scheme:
the full-modularized flue type extruded aluminum condensation heat exchanger comprises a plurality of extruded aluminum heat exchange unit elements 1, wherein cold medium circulating elements 2 are arranged between adjacent extruded aluminum heat exchange unit elements 1, an upper isobaric flue 3 and a dew-bearing plate 4 are arranged at the upper end face of each of the cold medium circulating elements 2 and the extruded aluminum heat exchange unit elements 1, a pair of headers 5 are arranged at one side of each of the cold medium circulating elements 2 with an interface, and a sealing cover plate 6 is arranged on the side wall of each of the cold medium circulating elements 2 at the end side of the heat exchanger;
the inside of the extruded aluminum heat exchange unit element 1 can circulate the flue gas with the temperature of 100-600 ℃ and fully absorb and utilize the heat in the flue gas, the flue gas side of the extruded aluminum heat exchange unit element 1 comprises fins 11 and rib plates 12 which are in through connection with the front wall surface and the rear wall surface, the outer wall surfaces of the left side and the right side of the extruded aluminum heat exchange unit element 1 are provided with cold working medium flowing flushing and are used for cooling high-temperature flue gas so as to exchange heat, the front end surface and the rear end surface of the extruded aluminum heat exchange unit element 1 are provided with connecting ribs 13 and through holes 14 positioned on the connecting ribs 13, and screw connecting seats 15 are arranged between the connecting ribs 13;
the cold working medium circulation element 2 is internally provided with a cold working medium channel 21 filled with cold working medium, the outer wall surfaces of the left side and the right side of the aluminum heat exchange unit element 1 are subjected to flow scouring extrusion to exchange heat, the bearing plate 22 is positioned on the neutral surface of the cold working medium circulation element 2 and penetrates through the end surface of the cold working medium circulation element 2, one side of the cold working medium circulation element 2 is provided with a cold working medium interface 23 communicated with the header 5, and the front end surface and the rear end surface are provided with connecting ribs 13 corresponding to the connecting ribs;
the header 5 comprises a butt joint 52 communicated with the cold working medium interface 23 of the cold working medium circulating element 2, a tank body 53 and a connector 51 which is sleeved on the butt joint 52 and mutually independent from the butt joint 52 and can be independently rotated.
The whole appearance of the extruded aluminum heat exchange unit element 1 is cuboid, the thickness of the outer wall is 5-8 mm, fins 11 are uniformly distributed on the flue gas side of the extruded aluminum heat exchange unit element 1 at equal intervals, the thickness of each fin 11 is 3-6 mm, the fin is determined by tongue specific strength calculation, flue gas flow rate and heat exchange power, the thickness of each rib plate 12 penetrating through the front wall surface and the rear wall surface is 3-6 mm so as to ensure the whole structural strength of the extruded aluminum heat exchange unit element 1, the connecting ribs 13 with square sections at four corners of the extruded aluminum heat exchange unit element 1 are 10-30 mm long and are used for fixedly connecting the extruded aluminum heat exchange unit element 1 with the cold medium circulation element 2 in a butt joint manner, the cold medium is sealed, screw connecting seats 15 penetrating through the upper end face and the lower end face of the extruded aluminum heat exchange unit element 1 are arranged between the connecting ribs 13, the sections of the screw connecting seats are round and the cross-shaped with the wall surfaces of the extruded aluminum heat exchange unit element 1, and the diameters of the screw connecting seats are 6-12 mm.
The extrusion aluminum heat exchange unit element 1 can be integrally extruded and formed, the distance between the top ends of the symmetrical fins 11 is not too small in consideration of the structural strength of the inner core of the extrusion die, the overall heat exchange efficiency of the extrusion aluminum heat exchange unit element 1 is low due to the fact that the distance between the top ends of the symmetrical fins 11 is large, the volume is increased, the weight is increased, the cost is increased, the extrusion aluminum heat exchange unit element 1 can be symmetrically extruded in a parting mode, and the problem that the efficiency is low and the cost is increased due to the fact that the distance between the top ends of the symmetrical extrusion aluminum heat exchange unit element 1 is large is effectively solved after the extrusion molding.
The fins 11 are axisymmetric or center-symmetric comb-tooth-shaped inner fin arrangement structures, the distance between symmetrical fin tops of the axisymmetric structures of the fins 11 and the distance between the fin tops of the center-symmetric structures and the inner wall surface of the extruded aluminum heat exchange unit element 1 at the other side are 10-16 mm when the extruded aluminum heat exchange unit element 1 is integrally extruded, the fins 11 effectively optimize the temperature gradient of flue gas in the horizontal section of the extruded aluminum heat exchange unit element 1 by adopting the structures, so that the central inert heat exchange area among rib plates 12 is reduced to strengthen the heat exchange effect, the uniform maximization of the temperature field of the horizontal section of the flue gas side is realized, meanwhile, the corrugated shape is in a zigzag, rectangular or sine function waveform, the effective heat exchange area of the fins 11 is increased, the flue gas disturbance is enhanced, the heat transfer effect is further improved, the corrugated shape is selected according to the manufacturing cost of an extrusion die, the heat exchange efficiency and the structural strength condition of the fins 11, and the thickness of the connecting ribs 13 is 3-6 mm.
The distance between the symmetrical fin tops of the axisymmetric structure of the fin 11 and the distance between the fin tops of the axisymmetric structure and the inner wall surface of the other side extrusion aluminum heat exchange unit element 1 are 2-6 mm when the extrusion aluminum heat exchange unit element 1 adopts symmetric parting extrusion, and the distance between the fin tops and the other side extrusion aluminum heat exchange unit element 1 is 2-4 mm from the side wall of the smoke at the front end and the rear end of the extrusion aluminum heat exchange unit element 1, the fin tops and the corresponding grooves are provided with a convex ridge and a corresponding groove, when the fin is assembled, the convex ridge and the groove are filled with sealant or sealing wax to seal the smoke, the air leakage is prevented, the rib plate 12 structure of the extrusion aluminum heat exchange unit element 1 adopting symmetric parting extrusion is required to be removed, a clamping groove is extruded at the corresponding position, the rib plate 12 is extruded and then plugged into the clamping groove position corresponding to the extrusion aluminum heat exchange unit element 1 which is sealed by glue or wax, the structural strength is increased, the thickness of the connecting rib 13 is consistent with the thickness of the extrusion aluminum heat exchange unit element 1 which is extruded by symmetric parting, the effect of sealing smoke is achieved, the screw connecting seat 15 is replaced, and screw connecting seat 15 is processed, and the screw hole with the diameter of 3-6 mm is processed at the center of the upper end and lower end section of the connecting rib 13.
The extruded aluminum heat exchange unit element 1 needs further subsequent processing after extrusion molding, 4-8 equally spaced through holes 14 with the diameter of 3-6 mm are required to be formed in the connecting ribs 13 for sealing the cold working medium side of the extruded aluminum heat exchange unit element 1, meanwhile, end cutting is also required to be carried out on the connecting ribs 13 on one side of the extruded aluminum heat exchange unit element 1 so as to prevent the condition that the extruded aluminum heat exchange unit element 1 cannot be assembled due to extrusion collision with the cold working medium interface 23, the cutting height is 20-40 mm, and screw holes with the diameter of 3-6 mm are correspondingly processed in the center of the section of the upper end and the lower end of the screw connecting seat 15 or the connecting ribs 13 when the extruded aluminum heat exchange unit element 1 adopts integral extrusion or symmetrical parting extrusion so as to be used for connecting and sealing the extruded aluminum heat exchange unit element 1 with the upper end isopipe 3 and the dew-bearing disk 4 of the lower end face.
The side wall of the cold working medium circulation element 2 is integrated with the bearing plate 22, the bearing plate 22 is positioned on the neutral surface of the cold working medium circulation element 2, the thickness is 3-6 mm, the two sides of the bearing plate 22 extend out of the convex wall, the effect of reinforcing the connection structural strength of the cold working medium circulation element 2 and forming a cold working medium channel 21 on the two sides of the bearing plate 22 is achieved, the bearing plate 22 effectively prevents the structural instability phenomenon caused by the long cantilever beam of the convex wall, one side of the cold working medium circulation element 2 is provided with a cold working medium interface 23, the outer wall of the cold working medium interface 23 is provided with threads for being matched with a connector 51, the inner ring is provided with a sealing groove with the depth of 1-2 mm, after a sealing gasket is added, the sealing gasket is matched with the butt joint 52 to achieve the effect of sealing the cold working medium, through holes are machined in positions corresponding to the through holes 14 on the front end surface and the rear end surface of the cold working medium circulation element 2, the cold working medium circulation element 2 and the extruded aluminum heat exchange single element 1 are sealed by adopting a sealing gasket, and the cold working medium 2 at the end side of the heat exchanger is matched with a sealing cover plate 6 to prevent cold leakage.
The cold working medium circulation element 2 adopts a double-water-channel form, comprises a lower water channel, an upper water channel and two pairs of cold working medium interfaces 23, the lower water channel can be communicated with a heat pump unit, the condensation amount of water vapor in flue gas in the extruded aluminum heat exchange unit element 1 is increased, the latent heat of the condensed water is fully recovered, the low-grade heat energy in the lower water channel is loaded into the upper water channel, the overall heat exchange efficiency is improved, or tap water is directly communicated for domestic hot water to realize the cascade utilization of energy, an air interlayer is arranged between the lower water channel and the upper water channel of the cold working medium circulation element 2, and the temperature difference of the cold working medium in the lower water channel and the upper water channel is effectively isolated to prevent the heat transfer short circuit phenomenon.
The whole internal diameter of the butt joint 52 contained in the header 5 is consistent, the external diameter of the local height range of 3-5 mm at the top end is 2-3 mm larger than the whole external diameter, the shape of the box 53 is square or cylindrical, the cross section area of a cold working medium flow passage is determined according to the flow velocity of the cold working medium, and the connecting head 51 which is sleeved on the butt joint 52 and mutually independent of the butt joint 52 and can be independently rotated is matched with a structure with larger diameter at the top end of the butt joint 52 to be connected with the cold working medium interface 23 so as to form a cold working medium passage.
The extruded aluminum heat exchange unit element 1 is made of aluminum-silicon-magnesium aluminum alloy materials, has high enough heat conductivity coefficient and tensile strength, and meanwhile, because the silicon content of the extruded aluminum material is far lower than that of cast aluminum-silicon-magnesium alloy and is easy to be corroded by condensate, an anodic oxidation treatment process is needed after extrusion and processing and forming, the cold working medium circulation element 2, the upper end isopipe 3, the dew bearing plate 4 and the header 5 are made of stainless steel or temperature-resistant and ageing-resistant plastic and glass fiber reinforced plastic materials, the stainless steel is 429, 430 and 444 series ferrite stainless steel, 304, 316 (L) and 317 (L) series austenite stainless steel, 2205, 2507 and 2707 series duplex stainless steel materials are specifically determined according to the structural strength, service life and manufacturing cost of each part.
Compared with the prior art, the invention has the following advantages:
1. the invention adopts a mature aluminum extrusion process, is the extension of an extrusion section in one-dimensional direction, performs random cutting according to the length of the heat exchanger, has the advantages of simple structure, high production efficiency, short service life of an extrusion die, quick updating, low price, capability of easily realizing the updating and updating of an extruded aluminum heat exchange unit element, complete heat exchange power specification, strong market adaptability, extremely low production cost, high heat conductivity coefficient and high strength of aluminum-silicon-magnesium extruded aluminum materials, and is an ideal process for manufacturing and producing the heat exchanger.
2. The modularized flue type extruded aluminum heat exchanger is simple in assembly and reliable in sealing performance, a double-water-channel mode is adopted, the heat pump unit can be connected to the lower water channel, the condensation amount of water vapor in smoke in the extruded aluminum heat exchange unit is increased, the latent heat of the smoke is fully recovered, low-grade heat energy in the lower water channel is loaded into the upper water channel, the overall heat exchange efficiency is improved, or tap water is directly connected for realizing the cascade utilization of energy by domestic hot water.
3. The modularized flue type extruded aluminum heat exchanger can be connected by adopting the full modularized bolts, has no welding process, is reliable in connection and seal and convenient to detach and maintain, meets various heat exchange capacity requirements, has strong market adaptability, can adopt the welding process, has only cold working medium on the welding side and no condensate on the flue gas side, does not generate Stress Corrosion Cracking (SCC), and has lower assembly process requirements.
Drawings
FIG. 1 is a general schematic diagram of a fully modular flue type extruded aluminum heat exchanger of the present invention.
Fig. 2a is a schematic perspective view of an extruded aluminum heat exchange unit, fig. 2b is an enlarged schematic top view of the extruded aluminum heat exchange unit when the fins adopt an axisymmetric comb-shaped inner fin arrangement structure, fig. 2c is an enlarged schematic top view of the extruded aluminum heat exchange unit when the fins adopt a centrosymmetric comb-shaped inner fin arrangement structure, fig. 2d is a single-sided extruded aluminum heat exchange unit adopting symmetrical parting extrusion, and fig. 2e and fig. 2f are enlarged schematic top views of left and right sides of the single-sided extruded aluminum heat exchange unit adopting symmetrical parting extrusion, respectively.
Fig. 3a is a schematic perspective view of a cold working medium circulation element, fig. 3b is a schematic side half-sectional view of the cold working medium circulation element, fig. 3c is a schematic view of a cold working medium interface, and fig. 3d is a schematic view of the cold working medium circulation element in a form of a double water channel.
Fig. 4a is a schematic perspective view of the header, and fig. 4b is a schematic view of the butt joint.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and to specific embodiments:
description of the preferred embodiments
A full-modularized flue type extruded aluminum condensing heat exchanger is shown in fig. 1, and comprises a plurality of extruded aluminum heat exchange unit elements 1, cold medium circulating elements 2 are arranged between adjacent extruded aluminum heat exchange unit elements 1, an upper isobaric flue 3 and a dew bearing plate 4 are arranged on the upper end face and the lower end face of the cold medium circulating elements 2 and the extruded aluminum heat exchange unit elements 1, a pair of headers 5 are arranged on one side of the cold medium circulating elements 2 with interfaces, and sealing cover plates 6 are arranged on the side walls of the cold medium circulating elements 2 on the end sides of the heat exchanger.
As shown in fig. 2a, the high-temperature flue gas circulates in the extruded aluminum heat exchange unit element 1, the flue gas side of the extruded aluminum heat exchange unit element comprises fins 11 and rib plates 12 which are in through connection with the front wall surface and the rear wall surface, cold working medium flows and washes out the outer wall surfaces of the left side and the right side of the extruded aluminum heat exchange unit element 1, the high-temperature flue gas is cooled to exchange heat, connecting ribs 13 and through holes 14 positioned on the connecting ribs 13 are arranged on the front end surface and the rear end surface of the extruded aluminum heat exchange unit element 1, and screw connecting seats 15 are further arranged between the connecting ribs 13.
As shown in fig. 3a, the cold medium flow element 2 is provided with a cold medium channel 21, which is filled with cold medium, and flows to wash and extrude the outer wall surfaces of the left side and the right side of the aluminum heat exchange unit element 1 to exchange heat, the bearing plate 22 is positioned on the neutral surface of the cold medium flow element 2, penetrates through the end surface of the cold medium flow element 2, one side of the cold medium flow element 2 is provided with a cold medium interface 23, and the front end surface and the rear end surface are provided with fixing ribs 24 corresponding to the connecting ribs 13;
as shown in fig. 4a, the header 5 includes a butt joint 52, a tank 53, and a connector 51 which is coupled to the butt joint 52 and is rotatable independently of the butt joint 52.
As shown in fig. 2a, the whole shape of the extruded aluminum heat exchange unit element 1 is rectangular, the thickness of the outer wall is 5-8 mm, the fins 11 are uniformly distributed on the flue gas side of the extruded aluminum heat exchange unit element 1 at equal intervals, the thickness of the fins 11 is 3-6 mm, the thickness of the rib plates 12 penetrating through the front wall surface and the rear wall surface is 3-6 mm, so as to ensure the whole structural strength of the extruded aluminum heat exchange unit element 1, as shown in fig. 2b, the four corners of the extruded aluminum heat exchange unit element 1 are provided with connecting ribs 13 with square sections, the connecting ribs 13 are 10-30 mm long, so that the extruded aluminum heat exchange unit element 1 and the cold working medium circulating element 2 are tightly connected by butting the fixing ribs 24, the cold working medium is sealed, screw connecting seats 15 penetrating through the upper end surface and the lower end surface of the extruded aluminum heat exchange unit element 1 are arranged between the connecting ribs 13, the cross sections of the screw connecting seats are round like in transition with the wall surface rounded corners of the extruded aluminum heat exchange unit element 1, and the diameter is 6-12 mm.
As shown in FIG. 2b, the fins are axisymmetric comb-tooth-shaped inner fin structures, the distance between symmetrical fin tops of the axisymmetric structures of the fins 11 is 10-16 mm, the fin 11 adopts the structures to effectively optimize the temperature gradient of the flue gas in the horizontal section of the extruded aluminum heat exchange unit element 1, so that the central inert heat exchange area between the rib plates 12 is reduced to strengthen the heat exchange effect, the uniform maximization of the temperature field of the horizontal section of the flue gas side is realized, meanwhile, the wall surface of the fin 11 is extruded to form waves, the waves are in the shape of zigzag, rectangular or sine function wave, the effective heat exchange area of the fin 11 is increased, the flue gas disturbance is enhanced, the heat transfer effect is further improved, the wave shape is selected according to the manufacturing cost of an extrusion die, the heat exchange efficiency and the structural strength condition of the fin 11, and the thickness of the connecting ribs 13 is 3-6 mm.
The extruded aluminum heat exchange unit element 1 needs further subsequent processing after extrusion molding, 4-8 equally-spaced evenly-arranged through holes 14 with diameters of 3-6 mm are needed to be formed in the connecting ribs 13 for completing sealing of the cold working medium side of the extruded aluminum heat exchange unit element 1, meanwhile, end cutting is needed to be carried out on the connecting ribs 13 on one side of the extruded aluminum heat exchange unit element 1 so as to prevent the condition that the extruded aluminum heat exchange unit element 1 cannot be assembled due to extrusion collision with the cold working medium interface 23, the cutting height is 20-40 mm, and threaded holes with diameters of 3-6 mm are formed in the center of the cross section of the upper end and the lower end of the screw connecting seat 15 and are used for connecting and sealing the extruded aluminum heat exchange unit element 1 with the equal-pressure flue 3 and the dew-bearing disc 4 on the lower end face.
As shown in fig. 3a and 3b, the side wall of the cold working medium circulating element 2 is integrated with the bearing plate 22, the bearing plate 22 is located on the neutral surface of the cold working medium circulating element 2, the thickness is 3-6 mm, the two sides of the bearing plate 22 extend out of the convex wall, the effect of reinforcing the connection structural strength of the cold working medium circulating element 2 and forming a cold working medium channel 21 on the two sides of the bearing plate 22 is achieved, the bearing plate 22 effectively prevents the structural instability phenomenon caused by the long cantilever beam of the convex wall, one side of the cold working medium circulating element 2 is provided with a cold working medium interface 23, as shown in fig. 3c, the outer wall of the cold working medium interface 23 is provided with threads for matching with a connector 51, the inner ring is provided with a sealing groove with a depth of 1-2 mm, after a sealing gasket is added, the sealing gasket is matched with the butt joint 52 to achieve the effect of sealing the cold working medium, the front end face and the rear end face of the cold working medium circulating element 2 are provided with fixing ribs 24 corresponding to the connecting ribs 13, through holes are machined at positions corresponding to the through holes 14, the cold working medium circulating element 2 and the extruded aluminum heat exchange single element 1 are sealed by adopting a sealing gasket to seal the cold working medium, and the cold working medium 2 located at the end side of the heat exchanger is matched with the cold working medium sealing cover plate 6 to prevent leakage.
The whole internal diameter of the butt joint 52 contained in the header 5 is consistent, as shown in fig. 4b, the external diameter is 2-3 mm larger than the whole external diameter in the local height range of 3-5 mm at the top end, the shape of the box 53 can be square or cylindrical, the cold working medium flow passage sectional area is determined according to the cold working medium flow velocity, and the connecting heads 51 which are sleeved on the butt joint 52 and mutually independent of the butt joint 52 and can be independently rotated are matched with the structure with larger diameter at the top end of the butt joint 52 to be connected with the cold working medium interface 23, so as to form a cold working medium passage.
The extruded aluminum heat exchange unit element 1 is made of aluminum-silicon-magnesium aluminum alloy materials, has high enough heat conductivity coefficient and tensile strength, and meanwhile, because the silicon content of the extruded aluminum material is far lower than that of cast aluminum-silicon-magnesium alloy and is easy to be corroded by condensate, the extruded aluminum heat exchange unit element 1 is required to be subjected to anodic oxidation treatment and other technological processes after extrusion and processing and molding, the cold working medium circulating element 2, the upper end isobaric flue 3, the dew bearing plate 4 and the header 5 are made of stainless steel or temperature-resistant and ageing-resistant plastic and glass fiber reinforced plastic materials, the stainless steel is 429, 430 and 444 series ferrite stainless steel, 304, 316 (L) and 317 (L) series austenite stainless steel, 2205, 2507 and 2707 series duplex stainless steel materials are specifically determined according to the structural strength, service life and manufacturing cost of each part.
Second embodiment
In this embodiment, the same reference numerals are given to the same structures as those of the first embodiment, and the same description is omitted.
As shown in FIG. 2c, the fins 11 are arranged in a central symmetrical comb-tooth-shaped inner fin structure, and the distance from the top of each fin 11 to the inner wall surface of the extruded aluminum heat exchange unit element 1 at the other side is 10-16 mm.
Description of the preferred embodiments
In this embodiment, the same reference numerals are given to the same structures as those of the first embodiment, and the same description is omitted.
When the extruded aluminum heat exchange unit element 1 is integrally extruded and formed in the first embodiment, in order to ensure the structural strength of the inner core of the extrusion die, a sufficient distance is required to be reserved between the top ends of the fins 11, but a larger heat exchange gap can lead to low overall heat exchange efficiency of the extruded aluminum heat exchange unit element 1, so that the volume is increased, the weight is increased, the cost is increased, the extruded aluminum heat exchange unit element 1 is symmetrically extruded and formed as shown in fig. 2d, and the symmetrical extruded aluminum heat exchange unit element 1 is closely packaged and formed after extrusion, so that the problems of low efficiency, high cost and the like caused by the large distance between the top ends of the symmetrical fins 11 are effectively solved.
The distance between the symmetrical fin tops of the axisymmetric structure of the fin 11 and the distance between the fin tops of the axisymmetric structure and the inner wall surface of the extruded aluminum heat exchange unit element 1 at the other side are 2-6 mm when the extruded aluminum heat exchange unit element 1 adopts symmetrical parting extrusion, and as shown in fig. 2e and 2f, the distance between the fin tops and the fin tops of the axisymmetric structure and the distance between the fin tops and the other side of the axisymmetric structure are 2-4 mm from the side wall of the smoke at the front end and the back end of the extruded aluminum heat exchange unit element 1, the fin tops and the grooves are provided with ridges and corresponding grooves, the positioning function can be achieved during assembly, the rib 12 is required to be removed from the structure of the extruded aluminum heat exchange unit element 1 in the symmetrical parting extrusion and extruded at the corresponding position, the clamping groove is extruded in the position corresponding to the extruded aluminum heat exchange unit element 1 in the way, the structure strength is increased, the thickness of the connecting rib 13 is consistent with the thickness of the extruded aluminum heat exchange unit element 1 in the symmetrical parting extrusion, the screw connecting seat 15 is provided with the function of sealing smoke so as to replace the screw connecting seat 15, and the threaded hole 1 with the diameter of 3-6 mm is processed at the center section of the upper end and lower end of the connecting rib 13 and the lower end of the extruded aluminum heat exchange unit element is used for connecting the sealing the end face 3 with the lower end of the equal pressure plate.
Fourth embodiment
In this embodiment, the same reference numerals are given to the same structures as those of the first embodiment, and the same description is omitted.
As shown in fig. 3d, the cold medium circulation element 2 adopts a double-water channel form, and comprises a lower water channel, an upper water channel and two pairs of cold medium connectors 23, the lower water channel can be connected with a heat pump unit, the condensation amount of water vapor in flue gas in the extruded aluminum heat exchange unit element 1 is increased, the latent heat of the condensed water is fully recovered, low-grade heat energy in the lower water channel is loaded into the upper water channel, the overall heat exchange efficiency is improved, or tap water is directly connected for domestic hot water to realize the cascade utilization of energy, an air interlayer is arranged between the lower water channel and the upper water channel of the cold medium circulation element 2, and the temperature difference of the cold medium in the lower water channel and the upper water channel is effectively isolated to prevent the heat transfer short circuit phenomenon.
Claims (8)
1. A full-modularized flue type extruded aluminum condensation heat exchanger comprises a plurality of extruded aluminum heat exchange unit elements (1), cold medium circulating elements (2) are arranged between adjacent extruded aluminum heat exchange unit elements (1), an upper isobaric flue (3) and a dew bearing plate (4) are arranged at the upper end surface of each of the cold medium circulating elements (2) and the extruded aluminum heat exchange unit elements (1), a pair of headers (5) are arranged at one side of each of the cold medium circulating elements (2) with an interface, and sealing cover plates (6) are arranged on the side wall of each of the cold medium circulating elements (2) at the end side of the heat exchanger;
the flue gas of 100-600 ℃ circulates in the extrusion aluminum heat exchange unit element (1) and fully absorbs and utilizes heat in the flue gas, the flue gas side of the extrusion aluminum heat exchange unit element comprises fins (11) and rib plates (12) which are in through connection with front and rear wall surfaces, cold working medium flows and washes out the outer wall surfaces of the left side and the right side of the extrusion aluminum heat exchange unit element (1), high-temperature flue gas is cooled to exchange heat, connecting ribs (13) and through holes (14) positioned on the front end surface and the rear end surface of the extrusion aluminum heat exchange unit element (1) are arranged on the front end surface and the rear end surface of the extrusion aluminum heat exchange unit element, and screw connecting seats (15) are arranged between the connecting ribs (13);
the cold working medium circulating element (2) is internally provided with a cold working medium channel (21), the cold working medium channel is filled with cold working medium, the outer wall surfaces of the left side and the right side of the cold working medium circulating element (2) are subjected to flow scouring and extrusion of the aluminum heat exchange unit element (1) to exchange heat, the bearing plate (22) is positioned on the neutral surface of the cold working medium circulating element (2) and penetrates through the end surface of the cold working medium circulating element (2), one side of the cold working medium circulating element (2) is provided with a cold working medium interface (23) communicated with the header (5), and the front end surface and the rear end surface are provided with fixing ribs (24) corresponding to the connecting ribs (13);
the header (5) comprises an abutment (52) communicated with the cold working medium interface (23) of the cold working medium circulating element (2), a tank body (53) and a connector (51) which is sleeved on the abutment (52) and mutually independent of the abutment (52) and can be independently rotated;
the extrusion aluminum heat exchange unit element (1) can be integrally extruded and formed, the distance between the top ends of the symmetrical fins (11) is not too small in consideration of the structural strength of an inner core of an extrusion die, the problem that the efficiency is low and the cost is high due to the fact that the distance between the top ends of the symmetrical fins (11) is large because the overall heat exchange efficiency of the extrusion aluminum heat exchange unit element (1) is low is solved, the volume is increased, the weight is increased and the cost is high because the extrusion aluminum heat exchange unit element (1) can be symmetrically extruded in a parting mode, and the problem that the efficiency is low and the cost is high due to the fact that the distance between the top ends of the symmetrical extrusion aluminum heat exchange unit element (1) is large is effectively solved after the extrusion molding;
the side wall of cold working medium circulation component (2) is integrative with bearing plate (22), bearing plate (22) are located cold working medium circulation component (2) neutral surface, thickness is 3 ~ 6mm, the convex wall is extended to bearing plate (22) both sides, have the effect of strengthening cold working medium circulation component (2) connection structure intensity and forming cold working medium passageway (21) in bearing plate (22) both sides, bearing plate (22) effectively prevent the structure unstability phenomenon that the long cantilever beam of convex wall leads to taking place, cold working medium circulation component (2) one side has cold working medium interface (23), cold working medium interface (23) outer wall is opened and is had the screw thread to be used for cooperation connector (51), the inner circle is opened and is had the degree of depth to be 1 ~ 2 mm's seal groove, install sealing washer after the cooperation with butt joint (52) and reach the effect of sealing cold working medium, cold working medium circulation component (2) front and back terminal surface is last to have fixed rib (24) that correspond with connecting rib (13), it is processed with through-hole (14) corresponding position, cold working medium circulation component (2) and extrusion aluminium heat transfer component (1) adopt sealing gasket to carry out sealing device to seal between cold working medium interface (2) and extrusion aluminium heat transfer component (1), cold working medium interface (2) side is located cold working medium 2 side sealing device (6) and is sealed.
2. A fully modular flue type extruded aluminum condensing heat exchanger according to claim 1, wherein: the whole appearance of the extrusion aluminum heat exchange unit element (1) is cuboid, the thickness of the outer wall is 5-8 mm, fins (11) are uniformly distributed on the smoke side of the extrusion aluminum heat exchange unit element (1) at equal intervals, the thickness of the fins (11) is 3-6 mm, the thickness of a rib plate (12) penetrating through the front wall surface and the rear wall surface is 3-6 mm according to tongue specific strength calculation, smoke flow rate and heat exchange power, so that the whole structural strength of the extrusion aluminum heat exchange unit element (1) is ensured, connecting ribs (13) with square sections at four corners of the extrusion aluminum heat exchange unit element (1) are 10-30 mm long and are used for butt joint of fixing ribs (24) to enable the extrusion aluminum heat exchange unit element (1) to be in fastening connection with cold medium circulation elements (2), cold medium is sealed, screw connecting seats (15) penetrating through the upper end face and the lower end face of the extrusion aluminum heat exchange unit element (1) are arranged between the connecting ribs (13), the cross section of the screw connecting seats is round with the wall surface rounded corner transition of the extrusion aluminum heat exchange unit element (1), and the diameter of the screw connecting seats is 6-12 mm.
3. A fully modular flue type extruded aluminum condensing heat exchanger according to claim 1, wherein: the fin (11) is of an axisymmetric or central symmetric comb-tooth-shaped inner fin arrangement structure, the distance between the symmetrical fin top of the axisymmetric structure of the fin (11) and the distance between the fin top of the central symmetric structure and the inner wall surface of the extruded aluminum heat exchange unit element (1) at the other side are 10-16 mm when the extruded aluminum heat exchange unit element (1) is integrally extruded, the fin (11) effectively optimizes the temperature gradient of smoke in the horizontal section of the extruded aluminum heat exchange unit element (1) by adopting the structures, so that the central inert heat exchange area among rib plates (12) is reduced to strengthen the heat exchange effect, the uniform maximization of the temperature field of the horizontal section of the smoke side is realized, meanwhile, the corrugated form is a zigzag, rectangular or sine function waveform, the effective heat exchange area of the fin (11) is increased, the smoke disturbance is enhanced, the heat transfer effect is further improved, the corrugated form is selected according to the manufacturing cost of an extrusion die, the heat exchange efficiency and the structural strength condition of the fin (11), and the thickness of the connecting rib (13) is 3-6 mm.
4. A fully modular flue type extruded aluminum condensing heat exchanger according to claim 3, wherein: the symmetrical fin top distance of the axisymmetric structure of the fin (11) and the fin top to the other side of the axisymmetric structure of the fin are 2-6 mm when the extruded aluminum heat exchange unit (1) is extruded in a symmetrical parting mode, the fin is 2-4 mm away from the side wall of the smoke at the front end and the rear end of the extruded aluminum heat exchange unit (1) and provided with a convex ridge and a corresponding groove, the fin plays a role in positioning during assembly, sealing glue or sealing wax is filled between the convex ridge and the groove to seal smoke, air leakage is prevented, the extruded aluminum heat exchange unit (1) in the symmetrical parting mode is required to remove the rib (12) structure and extrude a clamping groove at the corresponding position, the rib (12) is singly extruded and molded and then plugged into the clamping groove position corresponding to the extruded aluminum heat exchange unit (1) in a glue sealing mode or wax sealing mode, the thickness of the connecting seat (13) is consistent with the thickness of the extruded aluminum heat exchange unit (1) in the symmetrical parting mode, the sealing function of the sealing wax is achieved, and therefore the screw connecting seat (15) structure is replaced, and the cross section of the center of the connecting seat (13) is 3-6 mm.
5. A fully modular flue extruded aluminum condensing heat exchanger according to claim 3 or 4, characterized by: the extrusion molding of the extrusion aluminum heat exchange unit element (1) is further required to be processed later, 4-8 equally-spaced evenly-arranged through holes (14) with diameters of 3-6 mm are required to be formed in the connecting ribs (13) in order to finish sealing of the cold working medium side of the extrusion aluminum heat exchange unit element (1), meanwhile, the connecting ribs (13) on one side of the extrusion aluminum heat exchange unit element (1) are required to be subjected to end cutting so as to prevent the condition that the extrusion collision of the extrusion aluminum heat exchange unit element (1) and the cold working medium interface (23) leads to incapability of assembly, the cutting height is 20-40 mm, and screw holes with diameters of 3-6 mm are correspondingly processed in the center of the cross section of the upper end and the lower end of the screw connecting seat (15) or the connecting ribs (13) when the extrusion aluminum heat exchange unit element (1) adopts integral extrusion or symmetrical parting extrusion so as to be used for sealing connection between the extrusion aluminum heat exchange unit element (1) and the upper end isopipe (3) and the dew bearing disc (4) of the lower end surface.
6. A fully modular flue type extruded aluminum condensing heat exchanger according to claim 1, wherein: the cold working medium circulation element (2) adopts a double-water-channel form and comprises a lower water channel, an upper water channel and two pairs of cold working medium connectors (23), the lower water channel can be communicated with a heat pump unit, the condensation amount of water vapor in smoke in the extruded aluminum heat exchange unit element (1) is increased, the latent heat of the smoke is fully recovered, the low-grade heat energy in the lower water channel is loaded into the upper water channel, the overall heat exchange efficiency is improved, or tap water is directly communicated for domestic hot water to realize the cascade utilization of energy, an air interlayer is arranged between the lower water channel and the upper water channel of the cold working medium circulation element (2), and the temperature difference of the cold working medium in the lower water channel and the upper water channel is effectively isolated to prevent the heat transfer short circuit phenomenon.
7. A fully modular flue type extruded aluminum condensing heat exchanger according to claim 1, wherein: the whole internal diameter of the butt joint (52) contained in the header (5) is consistent, the external diameter is 2-3 mm larger than the whole external diameter in the local height range of 3-5 mm at the top end, the shape of the box body (53) is square or cylindrical, the cold working medium flow passage sectional area is determined according to the cold working medium flow velocity, and the connecting head (51) which is sleeved on the butt joint (52) and mutually independent of the butt joint (52) and can be independently rotated is matched with a structure with larger diameter at the top end of the butt joint (52) to be connected with the cold working medium interface (23) so as to form a cold working medium passage.
8. A fully modular flue type extruded aluminum condensing heat exchanger according to claim 1, wherein: the extruded aluminum heat exchange unit element (1) is made of aluminum alloy materials with high enough heat conductivity and tensile strength, meanwhile, the silicon content of the extruded aluminum material is far lower than that of cast aluminum silicon magnesium alloy and is easy to be corroded by condensate, so that an anodic oxidation treatment process is needed after extrusion, a cold working medium circulation element (2), an upper end isobaric flue (3), a dew bearing plate (4) and a collector (5) are made of stainless steel or temperature-resistant and ageing-resistant plastic and glass fiber reinforced plastic materials, the stainless steel is made of 429, 430 and 444 series ferrite stainless steel, 304, 316 (L) and 317 (L) series austenite stainless steel, 2205, 2507 and 2707 series duplex stainless steel materials, and the selection of the materials is specifically determined according to the structural strength, service life and manufacturing cost of each part.
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| CN111426060B (en) * | 2020-04-28 | 2024-04-12 | 西安交通大学 | Gas heating wall-mounted furnace adopting extrusion molding process |
| CN113237077B (en) * | 2021-04-09 | 2022-04-19 | 代少东 | Condensation heat exchanger structure |
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