CN109855308B - Modularized flue type extruded aluminum condensation heat exchanger - Google Patents
Modularized flue type extruded aluminum condensation heat exchanger Download PDFInfo
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- CN109855308B CN109855308B CN201910217581.7A CN201910217581A CN109855308B CN 109855308 B CN109855308 B CN 109855308B CN 201910217581 A CN201910217581 A CN 201910217581A CN 109855308 B CN109855308 B CN 109855308B
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 100
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 100
- 238000009833 condensation Methods 0.000 title claims description 7
- 230000005494 condensation Effects 0.000 title claims description 7
- 238000007789 sealing Methods 0.000 claims abstract description 60
- 238000005482 strain hardening Methods 0.000 claims abstract description 53
- 238000001125 extrusion Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 16
- 230000003647 oxidation Effects 0.000 claims abstract description 5
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 5
- 238000012545 processing Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 21
- 239000000779 smoke Substances 0.000 claims description 16
- 229910001220 stainless steel Inorganic materials 0.000 claims description 15
- 239000010935 stainless steel Substances 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 12
- 239000003546 flue gas Substances 0.000 claims description 12
- -1 aluminum silicon magnesium Chemical compound 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 3
- 238000001746 injection moulding Methods 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910001039 duplex stainless steel Inorganic materials 0.000 claims description 2
- 239000011152 fibreglass Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 229910000859 α-Fe Inorganic materials 0.000 claims description 2
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 21
- 239000007789 gas Substances 0.000 description 16
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 229910052802 copper Inorganic materials 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000003345 natural gas Substances 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 239000008236 heating water Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 229910000553 6063 aluminium alloy Inorganic materials 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
- 238000004458 analytical method Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method 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
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006866 deterioration Effects 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
- 238000011835 investigation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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]
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
A modularized flue type extruded aluminum condensing heat exchanger comprises a plurality of extruded aluminum heat exchange unit elements, an upper end isobaric flue, a sealing cover plate, a shell, a dew bearing plate, a flexible connecting pipe and a header; 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; an axisymmetric comb-tooth-shaped inner fin structure and surface waves are adopted to optimize temperature field distribution and enlarge effective heat exchange area; the unique anodic oxidation process of the extruded aluminum profile effectively prevents the condensate from being corroded; 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 flow mode of double-inlet and double-outlet cold working media is adopted to enable the cold working media to flow upwards uniformly in the whole course, and the occurrence of flow short circuit and flow dead zone is effectively prevented; the full bolt connection is adopted, so that the sealing is reliable and the disassembly and the maintenance are convenient; the modularized flue type extrusion aluminum heat exchanger can be manufactured by only one set of low-price extrusion die and processing equipment, and has excellent performance and price advantage.
Description
Technical Field
The invention belongs to the field of condensation heat exchangers which are capable of deeply utilizing flue gas waste heat, improving energy utilization efficiency, saving energy and protecting environment, and particularly relates to a 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. The energy saving and emission reduction of China is an important task facing us, the environment management of 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% to replace 0.74 hundred million tons of scattered coal, and the heating industry is newly added with131 hundred million meters of gas 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 water channel structure of the commercial gas heating water heater is not optimized, so that a plurality of problems exist, a typical integral cast aluminum silicon magnesium heat exchange furnace sheet is generally provided with a descending water channel structure to form a U-shaped loop, such as patent Nos. Bei Kaer/024712 and Bei Kaer A1 of cast aluminum silicon magnesium condensation heat exchanger company of the Netherlands, the water channel structure is easy to generate defects of heat transfer deterioration caused by supercooling and boiling, noise is generated due to bubble extrusion, even the heat exchanger structure is damaged, and the like, and the commercial gas heating furnace made of cast aluminum silicon magnesium and cast iron has the water channel structure problem that circulating water is difficult to drain during dry maintenance in a non-heating period.
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 production of the extrusion aluminum heat exchange unit element can be realized only by using an extrusion die with low cost, the aluminum-silicon-magnesium extrusion aluminum material has high heat conductivity and high strength, and meanwhile, the acid corrosion resistance is excellent after the anodic oxidation treatment process is carried out, so that the extrusion aluminum material 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 smoke discharge temperature, low heat 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 modularized flue type extruded aluminum condensing heat exchanger which adopts a mature and efficient extruded aluminum process to produce national brands.
The invention is realized by the following technical scheme:
the modularized flue type extruded aluminum condensation heat exchanger comprises a shell 4, a plurality of extruded aluminum heat exchange unit elements 1 arranged in the shell 4, sealing cover plates 3 arranged at the upper end face and the lower end face of the extruded aluminum heat exchange unit elements 1 and the shell 4, an upper end isopipe 2 arranged above the sealing cover plates 3 at the upper end face, a dew bearing plate 5 arranged below the sealing cover plates 3 at the lower end face, a flexible connecting pipe 6 and a collector 7 arranged on the upper side face and the lower side face of the shell 4;
the flue gas side of the extruded aluminum heat exchange unit element 1 comprises fins 11, rib plates 12 which are connected with the front wall surface and the rear wall surface in a penetrating way, a screw connecting seat 13 is arranged on the long wall surface of the cold working medium side, and clamping ribs 14 and threaded holes 15 positioned on the clamping ribs are also arranged at the corners of the periphery of the extruded aluminum heat exchange unit element 1;
the shell 4 is filled with cold working medium and structurally comprises an inlet and outlet cold working medium interface 41 connected with the header 7 through a flexible connecting pipe 6, a fracture 43 positioned above or below the cold working medium interface 41 and used for preventing the flexible connecting pipe 6 from being collided and difficult to tighten when in sealed connection, a clamping groove 42 arranged in the side surface of the shell 4 and clamped and fixed with the clamping rib 14 of the extruded aluminum heat exchange unit element 1, and a countersunk hole 44 penetrating through the clamping groove 42;
the flexible connection pipe 6 comprises a flexible pipe 62, a connector 61 which is sleeved on the flexible pipe 62 and mutually independent of the flexible pipe 62 and can be independently rotated, and a sealing ring 63 which is embedded at the top end of the flexible pipe 62.
The whole appearance of the extruded aluminum heat exchange unit element 1 is in a rectangular section, the thickness of the outer wall is 3-6 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 1.5-3 mm, the thickness of each 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 2-4 mm so as to ensure the whole structural strength of the extruded aluminum heat exchange unit element 1, screw connecting seats 13 penetrating through the upper end surface and the lower end surface of the extruded aluminum heat exchange unit element 1 and distributed regularly are arranged on the long wall surface of the cold working medium side of the extruded aluminum heat exchange unit element 1, the cross section of each screw connecting seat is in a quasi-circular shape which is in round corner transition with the long wall surface of the cold working medium side of the extruded aluminum heat exchange unit element 1, the diameter is 4-12 mm, and four corners of the extruded aluminum heat exchange unit element 1 are provided with clamping ribs 14 with square cross sections, the clamping ribs are 3-6 mm thick and 10-30 mm long so as to enable the extruded aluminum heat exchange unit element 1 to be clamped and fixed in the outer shell 4.
The fins 11 are of axisymmetric comb-tooth-shaped inner fin structures, so that the temperature gradient of flue gas in the horizontal section of the extruded aluminum heat exchange unit element 1 is effectively optimized, the central inert heat exchange area among 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 corrugated shape is formed by extrusion on the wall surface of the fins 11, the corrugated shape is 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, and the corrugated shape is selected according to the manufacturing cost of the extrusion die, the heat exchange efficiency and the structural strength condition of the fins 11.
Further subsequent processing is needed after the extrusion molding of the extruded aluminum heat exchange unit element 1, in order to complete the sealing of the cold working medium side of the extruded aluminum heat exchange unit element 1, threaded holes with the diameter of 2-6 mm are needed to be processed at the center of the section of the screw connecting seat 13, meanwhile, the clamping ribs 14 are needed to be subjected to end cutting to ensure the uniformity of the flowing of the cold working medium, the flowing short circuit and the flowing dead zone are prevented, the cutting height is 20-60 mm, the concrete determination is needed according to the flowing state of the cold working medium, and the threaded holes 15 which are evenly arranged at equal intervals are needed to be opened on the end face of the clamping ribs 14 and the countersunk holes 44 which are penetrated into the clamping grooves 42 are matched with connecting screws to fix the extruded aluminum heat exchange unit element 1 in the shell 4.
The sealing cover plate 3 is provided with a countersunk hole on the end face contacted with the smoke, the sealing cover plate 3 is connected and fastened through the inner hexagon screw, the aluminum heat exchange unit element 1 is extruded and a sealing gasket is arranged between the sealing cover plate 3 and the sealing gasket to ensure sealing cold working medium, the top of the inner hexagon screw is flush with the side end face of the smoke of the sealing cover plate 3, and the inner hexagon screw is effectively prevented from being overheated and deformed by high-temperature smoke.
The shell 4 is provided with an inlet and outlet cold working medium interface 41 with an outer boss type, when the shell 4 is made of plastic materials, a screw joint is required to be inlaid in the inlet and outlet cold working medium interface 41 in the injection molding stage of the shell 4 so as to strengthen the strength of a connecting structure and improve the sealing performance, and when the shell 4 is made of stainless steel materials, the outer wall of the inlet and outlet cold working medium interface 41 is directly threaded; the inside of the shell 4 is provided with a clamping groove 42 which is matched with the clamping rib 14 in size and is used for assembling and fixing the shell 4 and the extruded aluminum heat exchange unit element 1, the upper end plate and the lower end plate at the side of the inlet and outlet cold working medium interface 41 are provided with a fracture 43 and prevent the phenomenon that the shell 4 is difficult to tighten due to extrusion collision in the sealing connection process of the flexible connecting pipe 6, a countersunk hole 44 is positioned on the central axis of the clamping groove 42 and penetrates through the inner end surface of the clamping groove 42 and corresponds to the threaded holes 15 one by one, a sealing gasket is needed to be placed in the countersunk hole 44, and then a screw is needed to be screwed to fix the extruded aluminum heat exchange unit element 1 and seal the cold working medium.
The connector 61 of the flexible connecting pipe 6 adopts a similar circular shape or a regular hexagonal cross section shape with two parallel sections, the length of the flexible pipe 62 is determined according to the fixed position distance between the heat exchange main body and the header 7, and the sealing ring 63 is embedded at the top end of the flexible pipe 62 to be matched with the screw connector to seal the cold working medium.
The header 7 is the same as the shell 4, screw joints are adopted to strengthen the connection structure strength and improve the sealing performance when being made of plastic materials, the outer wall of the interface corresponding to the inlet-outlet cold working medium interface 41 is directly threaded when being made of stainless steel materials, the header 7 is fixed on a fixing frame, the interface of the header 7 corresponds to the inlet-outlet cold working medium interface 41 in parallel or the header 7 for water inflow is arranged downwards, the header 7 for water outflow is arranged upwards, the overall shape of the header 7 is square or cylindrical cold working medium flow passage sectional area, and the overall shape is determined according to the cold working medium flow velocity.
The cross section size of the extruded aluminum heat exchange unit element 1 is limited to the performance of the extruder, one-dimensional infinite extrusion is carried out in the height direction, but the size in the length direction and the width direction is limited, and the corresponding shell 4 is customized according to the field requirement and is connected with the extruded aluminum heat exchange unit element 1 in a clamping mode to form a one-dimensional stacking combination in the width direction or a two-dimensional parallel combination in the length direction and the width direction.
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, anodic oxidation treatment process is needed after extrusion and processing and forming, the upper end isobaric flue 2, the sealing cover plate 3, the shell 4, the dew bearing plate 5 and the header 7 are made of stainless steel or temperature-resistant and ageing-resistant plastic and glass fiber reinforced plastics, 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, and the selection of the materials is 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 simple structure and high production efficiency, can realize the extremely low production cost of the extruded aluminum heat exchange unit element by only one set of extrusion die, has 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 adopted, the assembly is simple, the sealing performance is reliable, the cold working medium flows upwards and uniformly in the whole course by adopting a double-inlet and double-outlet connection port mode, the situations of flow short circuit and flow dead zone are effectively prevented, and the stacking combination and parallel combination mode can meet the power use and field requirements of various heat exchangers.
3. The modularized flue type extruded aluminum heat exchanger is connected by adopting the full modularized bolts, has no welding process, is reliable in connection and seal, is convenient to detach and maintain, meets the requirements of various heat exchange capacities, and has strong market adaptability.
Drawings
FIG. 1 is a general schematic diagram of a modular flue type extruded aluminum heat exchanger of the present invention.
Fig. 2 is a schematic diagram of an extruded aluminum heat exchange unit, in which fig. 2a is a schematic perspective view of the extruded aluminum heat exchange unit, and fig. 2b is an enlarged schematic diagram of the top of the extruded aluminum heat exchange unit.
Fig. 3 is a schematic view of a sealing cover plate, wherein fig. 3a is a schematic perspective view of the sealing cover plate, and fig. 3b is an enlarged schematic view of the assembly of the sealing cover plate and an extruded aluminum heat exchange unit element.
Fig. 4 is a schematic view of the structure of the housing.
Fig. 5 is a schematic view of a screw joint structure.
Fig. 6 is a schematic view of a flexible connection pipe structure.
Fig. 7 is a schematic view of the extrusion molding of the fin wall surface, wherein fig. 7a is a sine function waveform, fig. 7b is a zigzag, and fig. 7c is a rectangle.
Fig. 8 is a schematic diagram of two combined arrangements of extruded aluminum heat exchange unit elements, wherein fig. 8a is a schematic diagram of one-dimensional stacked combination in the width direction, and fig. 8b is a schematic diagram of two-dimensional parallel combination in the length and width directions.
Detailed Description
In order to make the technical scheme and the manufacturing process of the invention more apparent, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The optimal cross-section size of the extruded aluminum heat exchange unit element 1 is determined through calculation, simulation and analysis, wherein the whole appearance of the extruded aluminum heat exchange unit element 1 is a rectangular cross section, fins 11 are uniformly distributed on the smoke side of the extruded aluminum heat exchange unit element 1 at equal intervals and are of axisymmetric comb-tooth-shaped inner fin structures, so that the temperature gradient of smoke in the horizontal cross section of the extruded aluminum heat exchange unit element 1 can be effectively optimized, 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 cross section of the smoke side is realized, and meanwhile, the wall surface of each fin 11 is provided with zigzag waves as shown in fig. 7b, and sine function waves and rectangular waves as shown in fig. 7a and 7b can also be provided, so that the effective heat exchange area of each fin 11 is effectively increased, the smoke disturbance is enhanced, and the heat transfer effect is further improved. The rib plates 12 are connected with the front wall surface and the rear wall surface in a penetrating way to ensure the integral structural strength of the extruded aluminum heat exchange unit element 1, screw connecting seats 13 which are arranged regularly and penetrate through the upper end face and the lower end face of the extruded aluminum heat exchange unit element 1 are arranged on the cold working medium side long wall surface of the extruded aluminum heat exchange unit element 1, the cross sections of the screw connecting seats are round-like and transition with round corners of the cold working medium side long wall surface of the extruded aluminum heat exchange unit element 1, rib clamping ribs 14 with square cross sections are arranged at four corners of the extruded aluminum heat exchange unit element 1 and are used for clamping and fixing the extruded aluminum heat exchange unit element 1 in the shell 4 in a butt joint groove 42, corresponding extrusion dies are customized after the specific shape and size of the cross section of the extruded aluminum heat exchange unit element 1 are determined, 6063 aluminum silicon magnesium alloy is selected as extrusion materials for extrusion molding, the transition deformation section of the first section is required to be cut off in the forming stage, after a stable section is formed by extrusion, the section is cut according to the contour of a calculation result, heat preservation aging treatment is carried out, then surface sand blasting treatment can be selectively carried out, an anodic oxidation treatment process for resisting condensate corrosion is completed, a threaded hole is processed in the center of the section of the screw connecting seat 13, meanwhile, the clamping rib 14 is required to be cut into the end part to ensure the uniformity of cold working medium flow, the occurrence of flow short circuit and flow dead zone conditions is prevented, threaded holes 15 which are uniformly arranged at equal intervals and penetrate through the clamping grooves 42 are formed in the end face of the clamping rib 14, and in this way, the manufacture of the extruded aluminum heat exchange unit element 1 is completed as shown in fig. 2a and 2 b.
The shell 4 is specifically manufactured according to the heat exchange power and the site limitation, a plastic material with temperature resistance and ageing resistance is adopted, an inlet and outlet cold working medium interface 41 with an outer boss type is adopted, a copper screw joint shown in fig. 5 is inlaid in the inlet and outlet cold working medium interface 41 in the injection molding stage of the shell 4 to strengthen the strength of a connecting structure and improve the sealing performance, a clamping groove 42 matched with the clamping rib 14 in size is machined on the inner side of the shell 4 for assembling and fixing the shell 4 and the extruded aluminum heat exchange unit element 1, a fracture 43 is formed on the upper end plate and the lower end plate on the side of the inlet and outlet cold working medium interface 41, and the phenomenon that the soft connecting pipe 6 is difficult to tighten due to extrusion collision with the shell 4 in the sealing connection process is prevented, a countersunk hole 44 penetrating through the inner end face of the clamping groove 42 is drilled on the central axis of the clamping groove 42 and corresponds to the threaded hole 15 one by one, and the shell 4 is manufactured in this way as shown in fig. 4.
The extruded aluminum heat exchange unit element 1 is clamped into the shell 4 through the clamping ribs 14 and the clamping grooves 42, and is combined in a one-dimensional stacking mode in the width direction as shown in fig. 8a, or can be combined in two dimensions in parallel in the length direction and the width direction as shown in fig. 8b, a sealing gasket is placed in the counter bore 44, a screw is tightened to fix the extruded aluminum heat exchange unit element 1 to seal cold working medium, and meanwhile the extruded aluminum heat exchange unit element 1 is completely fixed in the shell 4, so that the heat exchange main body is assembled.
The sealing cover plate 3 is made of 316L stainless steel, as shown in fig. 3a, the whole stamping forming is adopted, a countersink is formed in the end face, in contact with smoke, of the sealing cover plate 3, the whole cross section of the sealing cover plate 3 is square, the side line is overlapped with the assembled heat exchange main body, a sealing gasket with the same cross section shape as the sealing cover plate 3 is placed between the sealing cover plate 3 and the heat exchange main body, the sealing cover plate 3 is covered, the sealing gasket is placed into the countersink, as shown in fig. 3b, a sealing cold working medium is ensured through the connection and the fastening of an inner hexagon screw, the top of the assembled inner hexagon screw is flush with the smoke side end face of the sealing cover plate 3, and the inner hexagon screw is effectively prevented from being overheated and deformed due to high-temperature smoke.
The stainless steel upper end isobaric flue 2 made of 316L material and the dew bearing plate 5 made of plastic material are connected with a heat exchange main body sealed by a water side after the sealing cover plate 3 is arranged by bolts, so that a flue gas side passage is formed.
The header 7 is made of heat-resistant and ageing-resistant plastic materials like the shell 4, a copper screw joint is embedded into an interface to strengthen the strength of a connecting structure and improve the sealing performance, the header 7 and the heat exchange main body are fixed on a commodity tank inner fixing frame, the interface is flush with an inlet and outlet cold working medium interface 41, and the overall shape of the header 7 can be square.
As shown in fig. 6, the flexible connection pipe 6 has two parallel-section circular connectors 61, which are independent of the flexible pipe 62, and can rotate independently without driving the flexible pipe 62, a sealing ring 63 is embedded in the top end of the flexible pipe 62 to seal the cold working medium in cooperation with the screw connectors, and the two ends of the flexible connection pipe 6 are screwed into the copper screw connectors embedded on the inlet-outlet cold working medium interface 41 and the header 7 respectively to complete the assembly of the modularized flue type extruded aluminum heat exchanger, as shown in fig. 1.
Claims (7)
1. The modularized flue type extruded aluminum condensation heat exchanger comprises a shell (4), a plurality of extruded aluminum heat exchange unit elements (1) arranged in the shell (4), sealing cover plates (3) arranged at the upper end surfaces and the lower end surfaces of the extruded aluminum heat exchange unit elements (1) and the shell (4), an upper end equal pressure flue (2) arranged above the sealing cover plates (3) at the upper end surfaces, a dew bearing disc (5) arranged below the sealing cover plates (3) at the lower end surfaces, flexible connecting pipes (6) and a header (7) arranged on the upper side surfaces and the lower side surfaces of the shell (4);
the flue gas side of the extruded aluminum heat exchange unit element (1) comprises fins (11), rib plates (12) which are connected with the front wall surface and the rear wall surface in a penetrating way, a screw connecting seat (13) is arranged on the long wall surface of the cold working medium side, and clamping ribs (14) and threaded holes (15) positioned on the clamping ribs are arranged at the corners of the periphery of the extruded aluminum heat exchange unit element (1);
the shell (4) is filled with cold working medium, structurally comprises an inlet and outlet cold working medium interface (41) connected with the header (7) through a flexible connecting pipe (6), a fracture (43) which is positioned above or below the cold working medium interface (41) and is difficult to tighten when the flexible connecting pipe (6) is in sealing connection, a clamping groove (42) which is arranged in the side surface of the shell (4) and is clamped and fixed with a clamping rib (14) of the extruded aluminum heat exchange unit element (1), and a countersink (44) which penetrates through the clamping groove (42);
the flexible connecting pipe (6) comprises a flexible pipe (62), a connector (61) which is sleeved on the flexible pipe (62) and mutually independent of the flexible pipe (62) and can be independently rotated, and a sealing ring (63) which is embedded at the top end of the flexible pipe (62);
the whole appearance of the extruded aluminum heat exchange unit element (1) is rectangular in section, the thickness of the outer wall is 3-6 mm, fins (11) are uniformly distributed on the smoke side of the extruded aluminum heat exchange unit element (1) at equal intervals, the thickness of each fin (11) is 1.5-3 mm, the thickness of each rib plate (12) penetrating through the front wall surface and the rear wall surface is 2-4 mm according to tongue specific strength calculation and smoke flow rate and heat exchange power, so that the whole structural strength of the extruded aluminum heat exchange unit element (1) is ensured, screw connecting seats (13) penetrating through the upper end face and the lower end face of the extruded aluminum heat exchange unit element (1) and distributed regularly are arranged on the long wall surface of the cold working medium side of the extruded aluminum heat exchange unit element (1), the cross sections of the screw connecting seats are round in circular shape and have diameters of 4-12 mm, the four corners of the extruded aluminum heat exchange unit element (1) are provided with clamping ribs (14) with square sections, and the clamping ribs (14) are 3-6 mm thick and 10-30 mm long, so that the extruded aluminum heat exchange unit element (1) is clamped and fixed in a shell (4);
the fins (11) are of axisymmetric comb-tooth-shaped inner fin structures, so that the temperature gradient of smoke in the horizontal section of the extruded aluminum heat exchange unit element (1) is effectively optimized, the central inert heat exchange area among 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 smoke side is realized, meanwhile, the wall surface of the fins (11) is extruded to form waves, the waves are in the shape of saw-tooth, rectangular or sine function waveforms, the effective heat exchange area of the fins (11) is increased, the smoke disturbance is enhanced, the heat transfer effect is further improved, and 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 fins (11);
the extrusion aluminum heat exchange unit element (1) is extruded and formed, further subsequent processing is needed, in order to finish sealing of the cold working medium side of the extrusion aluminum heat exchange unit element (1), threaded holes with the diameter of 2-6 mm are needed to be processed in the center of the section of the screw connecting seat (13), meanwhile, end cutting is needed to be conducted on the clamping ribs (14) to ensure uniformity of flow of the cold working medium, the conditions of flow short circuit and flow dead zones are prevented, the cutting height is 20-60 mm, the concrete determination is needed according to the flow state of the cold working medium, and the threaded holes (15) which are evenly arranged at equal intervals are needed to be opened on the end face of the clamping ribs (14) are matched with the countersunk holes (44) which are communicated with the clamping grooves (42) to be connected with the connecting screws, so that the extrusion aluminum heat exchange unit element (1) is fixed in the shell (4).
2. A modular flue type extruded aluminum condensing heat exchanger according to claim 1, wherein: the sealing cover plate (3) is provided with countersunk holes on the end face contacted with the flue gas, the sealing cover plate (3) is connected and fastened through the inner hexagon screw, the aluminum heat exchange unit element (1) is extruded and the sealing gasket between the sealing cover plate and the sealing cover plate is positioned to ensure sealing cold working medium, the top of the inner hexagon screw is flush with the side end face of the flue gas of the sealing cover plate (3), and the inner hexagon screw is effectively prevented from being overheated and deformed by high-temperature flue gas.
3. A modular flue type extruded aluminum condensing heat exchanger according to claim 1, wherein: the shell (4) is provided with an inlet and outlet cold working medium interface (41) with an outer boss type, when the shell (4) is made of plastic materials, a screw joint is required to be embedded into the inlet and outlet cold working medium interface (41) in the injection molding stage of the shell (4) so as to strengthen the strength of a connecting structure and improve the sealing performance, and when the shell (4) is made of stainless steel materials, the outer wall of the inlet and outlet cold working medium interface (41) is directly threaded; the inside of the shell (4) is provided with a clamping groove (42) which is matched with the clamping rib (14) in size, the shell (4) is assembled and fixed with the extruded aluminum heat exchange unit (1), the upper end plate and the lower end plate at the side of the inlet and outlet cold working medium interface (41) are provided with a fracture (43) and prevent the phenomenon that the extrusion collision is difficult to tighten with the shell (4) in the sealing connection process of the flexible connecting pipe (6), a countersunk hole (44) is positioned on the central axis of the clamping groove (42) and penetrates through the inner end surface of the clamping groove (42) and corresponds to the threaded holes (15) one by one, and a sealing gasket is needed to be placed in the countersunk hole (44) to tighten a screw so as to fix the extruded aluminum heat exchange unit (1) and seal the cold working medium.
4. A modular flue type extruded aluminum condensing heat exchanger according to claim 1, wherein: the connector (61) of the flexible connecting pipe (6) adopts a similar circular shape or a regular hexagonal cross section shape with two parallel sections, the length of the flexible pipe (62) is determined according to the fixed position distance between the heat exchange main body and the header (7), and the sealing ring (63) is embedded at the top end of the flexible pipe (62) to be matched with the screw connector to seal the cold working medium.
5. A modular flue type extruded aluminum condensing heat exchanger according to claim 1, wherein: the header (7) is the same as the shell (4), screw joints are adopted to strengthen the connection structure strength and improve the sealing performance when being made of plastic materials, threads are directly formed on the outer wall of an interface corresponding to the inlet-outlet cold working medium interface (41) when being made of stainless steel materials, the header (7) is fixed on a fixing frame, the interface of the header (7) corresponds to the inlet-outlet cold working medium interface (41) in parallel or the header (7) of water inlet is biased downwards, the header (7) of water outlet is biased upwards, the overall shape of the header (7) is square or cylindrical cold working medium flow passage sectional area, and the header is determined according to the cold working medium flow velocity.
6. A modular flue type extruded aluminum condensing heat exchanger according to claim 1, wherein: the cross section size of the extruded aluminum heat exchange unit element (1) is limited to the performance of the extruder, the one-dimensional infinite extrusion extension is carried out in the height direction, the size in the length direction and the width direction is limited, and the corresponding shell (4) is clamped into the extruded aluminum heat exchange unit element (1) according to the field requirement to realize the one-dimensional stacking combination mode in the width direction or the two-dimensional parallel combination of the length direction and the width direction.
7. A 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, an upper end isobaric flue (2), a sealing cover plate (3), a shell (4), a dew bearing plate (5) and a header (7) are made of stainless steel or temperature-resistant and ageing-resistant plastic and glass fiber reinforced plastics, the stainless steel is made of 429, 430 and 444 series ferrite stainless steel, 304, 316L and 317L series austenitic stainless steel, 2205, 2507 and 2707 series duplex stainless steel, 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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| CN108731021A (en) * | 2018-06-25 | 2018-11-02 | 西安交通大学 | A kind of various dimensions composite moduleization casting condensation enhanced heat exchange device |
| CN208587920U (en) * | 2018-06-25 | 2019-03-08 | 西安交通大学 | A kind of various dimensions composite moduleization casting condensation enhanced heat exchange device structure |
| CN209877376U (en) * | 2019-03-21 | 2019-12-31 | 西安交通大学 | Modular flue type extruded aluminum condensation heat exchanger structure |
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| CN108731021A (en) * | 2018-06-25 | 2018-11-02 | 西安交通大学 | A kind of various dimensions composite moduleization casting condensation enhanced heat exchange device |
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