CN116447897A - Spiral coil type heat exchanger with inner fins and outer fins - Google Patents
Spiral coil type heat exchanger with inner fins and outer fins Download PDFInfo
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- CN116447897A CN116447897A CN202310429292.XA CN202310429292A CN116447897A CN 116447897 A CN116447897 A CN 116447897A CN 202310429292 A CN202310429292 A CN 202310429292A CN 116447897 A CN116447897 A CN 116447897A
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- 238000000576 coating method Methods 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 3
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- 238000009826 distribution Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000003466 welding Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 239000006229 carbon black Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
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- 239000010439 graphite Substances 0.000 description 1
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- 238000009776 industrial production Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
- F28D7/024—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
- B01J19/1806—Stationary reactors having moving elements inside resulting in a turbulent flow of the reactants, such as in centrifugal-type reactors, or having a high Reynolds-number
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/08—Tubular elements crimped or corrugated in longitudinal section
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/007—Auxiliary supports for elements
- F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/24—Arrangements for promoting turbulent flow of heat-exchange media, e.g. by plates
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Geometry (AREA)
- Fluid Mechanics (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses an inner and outer fin spiral coil type heat exchanger, which belongs to the technical field of heat exchangers and comprises at least one group of spiral heat exchange coils; each group of heat exchange coil pipes comprises a plurality of layers of layer pipes, outer fins and inner fins are fixedly welded on the layer pipes, adjacent layer pipes are fixedly connected through double-head pipe clamps, and the heat exchange coil pipes correspond to a high temperature area, a medium temperature area and a low temperature area to form a high temperature area heat exchange coil pipe, a medium temperature area heat exchange coil pipe and a low temperature area heat exchange coil pipe aiming at temperature gradient distribution required by an industrial device such as a reaction kettle; according to the invention, the distance between adjacent layers of the heat exchange coil, the number of the inner fins and the outer fins and the density are changed according to different required temperatures of each heat exchange area, the equidistant arrangement structure of the heat exchange coil layers summarized in the prior art is adjusted to be an equidistant arrangement structure, and the total length of the heat exchange tubes can be shortened to reduce the overall quality of the heat exchanger under the condition that the optimal heat exchange quantity and heat exchange temperature difference of each heat exchange area are met, so that the material and energy consumption is reduced.
Description
Technical Field
The invention relates to the technical field of heat exchangers, in particular to an inner and outer fin spiral coil type heat exchanger.
Background
More than 80% of energy transfer in industrial processes relies on heat exchange equipment, and more than 75% of the heat exchange equipment is indirect tubular heat exchangers. Compared with a common heat exchanger, the spiral tube type heat exchanger has the advantages of large heat transfer coefficient, compact structure, easy cleaning, easy maintenance, small dirt heat resistance and the like, can be extremely attached to the cylinder-like shape of industrial devices such as a reaction kettle and the like, and is suitable for heat exchange and temperature control in the devices; however, as the general reaction kettle is large, the heat utilization area is mainly concentrated in the material reaction area, and the rest areas do not need high-density heat exchange; the inner space of the reaction kettle also causes the overlong tube pass of the heat exchange coil, and more energy sources are needed to provide power, so that the waste of materials and energy sources is caused; the fin-tube heat exchanger has the advantages of strong heat transfer capability, simple and compact structure and the like, however, the fin structure is single, the intensified heat exchange effect is limited, the fins are radial fins, and the fluid inside and outside the fin tube can only exchange heat at 90 degrees in a crossing way during heat exchange, so that the heat exchange efficiency is low.
At present, the two enhanced heat transfer technologies are widely applied in the fields of heat exchangers and chemical industry, but most enterprises only apply one technology, namely only tube spiral arrangement is adopted as a heat exchange tube and only fin tube array arrangement is adopted; compared with the two technologies adopted at the same time, the method has the problems of larger product volume and more material consumption.
Disclosure of Invention
The invention aims to provide an inner and outer fin spiral coil type heat exchanger which is compact in structure and reasonable in arrangement. The technical scheme of the invention is as follows: the heat exchanger comprises at least one group of heat exchange coils which are spirally arranged;
each group of heat exchange coil pipes comprises a plurality of layers of layer pipes, outer fins and inner fins are fixedly welded on the layer pipes, adjacent layer pipes are fixedly connected through double-head pipe clamps, and the heat exchange coil pipes correspond to a high temperature area, a medium temperature area and a low temperature area to form a high temperature area heat exchange coil pipe, a medium temperature area heat exchange coil pipe and a low temperature area heat exchange coil pipe;
tube spacing between tubes of high temperature zone heat exchange coil: the pipe diameter of the pipe is 1:1-2, and the pipe spacing between the pipes of the heat exchange coil in the high temperature area is as follows: tube spacing between tubes of medium temperature zone heat exchange coil: the pipe spacing between the layers of the low temperature zone heat exchange coil is 1:2:4.
According to the further technical scheme, the outer fins are uniformly distributed along the axial direction of the outer wall of the layer tube, the outer fins are spiral, the pitch of each outer fin is smaller than the tube diameter of the layer tube at the corresponding position, the fin height is smaller than 1/2 of the distance between adjacent layer tubes, and the fin thickness is smaller than the wall thickness of the layer tube;
the inner fins are uniformly arranged on the inner wall of the layer tube, the inner fins are longitudinal tree-shaped straight fins, each group of inner fins comprises a left fin and a right fin, the left fin and the right fin are arranged at equal intervals in a staggered mode, and the sum of the transverse maximum diameters between the left fin and the right fin is smaller than the inner tube diameter of the layer tube.
According to a further technical scheme, anti-corrosion coatings are arranged on the heat exchange coil and the outer fins.
According to a further technical scheme, the high-temperature area heat exchange coil, the medium-temperature area heat exchange coil and the low-temperature area heat exchange coil are communicated in series to form an integrated structure, and an inlet pipe and an outlet pipe are arranged on the integrated structure.
According to the technical scheme, a high-temperature area heat exchange coil, a medium-temperature area heat exchange coil and a low-temperature area heat exchange coil are arranged in parallel, and the ends of the high-temperature area heat exchange coil, the medium-temperature area heat exchange coil and the low-temperature area heat exchange coil are respectively provided with an inlet pipe and an outlet pipe.
According to a further technical scheme, the outer fins correspond to the high-temperature zone, the medium-temperature zone and the low-temperature zone to form high-temperature zone outer fins, medium-temperature zone outer fins and low-temperature zone outer fins; tube spacing between tubes of high temperature zone heat exchange coil: pitch of the outer fins in the high temperature region: pitch of the outer fins in the medium temperature zone: the pitch of the fins outside the low temperature area is 2:1:2:4;
the inner fins correspond to the high temperature zone, the middle temperature zone and the low temperature zone to form a high temperature zone inner fin, a middle temperature zone inner fin and a low temperature zone inner fin; tube diameter of the tube: spacing of fins in high temperature zone: spacing of fins in the medium temperature zone: the spacing of the fins in the low temperature zone is 5:2:4:8.
Further technical scheme, heat exchange coil is provided with two at least groups, and heat exchange coil overlaps in proper order from inside to outside and establishes formation inlayer heat exchange coil and outer heat exchange coil, through double-end pipe clamp fixed connection between inlayer heat exchange coil and the outer heat exchange coil, outer heat exchange coil's pipe interval: the pipe spacing of the inner layer heat exchange coil is 2-4:1, and the spacing between the pipe of the inner layer heat exchange coil and the pipe of the outer layer heat exchange coil is larger than the fin height of the double outer fins. The invention has the beneficial effects that: the invention can enhance the heat transfer effect of the indirect tubular heat exchanger, improve the maximum heat utilization efficiency of the heat exchanger and reduce the power consumption of heat exchange equipment, and is particularly characterized in the following aspects: 1. the invention has compact integral structure, the spacing between adjacent layers of the heat exchange coil, the number and the density of the inner fins and the outer fins are distributed according to the temperature steps required by heat exchange areas in industrial devices such as reaction kettles, the equidistant arrangement structure of the layers of the heat exchange coil summarized in the prior art is adjusted to be an equidistant arrangement structure, and the total length of the heat exchange tube can be shortened to reduce the integral quality of the heat exchanger under the condition of meeting the optimal heat exchange quantity and heat exchange temperature difference of each heat exchange area, thereby reducing the material and energy consumption;
2. according to the invention, the pipe sections of different heat exchange areas of the heat exchange coil can be connected in parallel or in series according to actual conditions, so that the requirement of accurate temperature control of the reaction temperature of materials in the reaction kettle is realized;
3. the spiral short fins which are axially segmented are arranged outside the heat exchange coil, so that the heat exchange area is increased, the whole heat exchange area per unit volume of the heat exchanger is higher than that of a common heat exchanger, and meanwhile, the convection heat exchange of the inner side and the outer side of the heat exchanger is enhanced, so that the heat exchange density of the whole heat exchanger is higher than that of the common heat exchanger;
4. the inside of the heat exchange coil pipe adopts the left-right separated longitudinal tree-shaped straight fins, so that the heat exchange area in the pipe is increased, and the flow disturbance of the heat exchange working medium in the pipe is improved, thereby comprehensively optimizing the flow and heat transfer process in the pipe, and simultaneously, the left-right separated fins can prevent the heat exchange pipe from being deformed and damaged due to extrusion in the spiral winding process, so that the heat exchange coil pipe is blocked;
5. the invention also provides a double-layer or multi-layer heat exchange coil structure, and the outermost coil is used as a heat preservation coil, so that the heat loss in the heat exchange process of the inner layer heat exchange coil can be reduced, and the heat preservation coil can be connected with the reaction kettle to serve as a rib to strengthen the whole reaction kettle and serve as a bracket to fix the inner layer heat exchange coil.
Drawings
Figure 1 is a schematic view of the heat exchange coil of the present invention,
figure 2 is a longitudinal section through the tube of figure 1,
figure 3 is an axial cross-section of the tube of figure 1,
figure 4 is a schematic view of the fin pitch structure of the tube of figure 1,
figure 5 is a schematic view of the orientation of the dual-ended clamp of the present invention,
figure 6 is a schematic view of the double-ended tube clamp of the present invention,
figure 7 is a schematic view of the double layer heat exchange coil of the present invention,
figure 8 is a top view of a double layer heat exchange coil of the present invention,
figure 9 is a chart of the tube orientation of the double layer heat exchange coil of the present invention,
FIG. 10 is a schematic view of the connection structure between the double-layer heat exchange coils of the present invention;
wherein, 1, heat exchange coil, 11, high temperature area heat exchange coil, 12, middle temperature area heat exchange coil, 13, low temperature area heat exchange coil, 14, inner layer heat exchange coil, 15, outer layer heat exchange coil, 2, layer tube, 3, outer fin, 31, high temperature area outer fin, 32, middle temperature area outer fin, 33, low temperature area outer fin, 4, inner fin, 41, a high-temperature area inner fin, 42, a medium-temperature area inner fin, 43, a low-temperature area inner fin, 5, a double-head pipe clamp, 51, a double-head pipe clamp distance bolt, 52, an upper pipe clamp, 53, an upper pipe clamp fixing bolt, 54, a lower pipe clamp, 55, a lower pipe clamp fixing bolt, 6, a reaction kettle inner wall, 7 and an outer coil pipe welding bracket.
Detailed Description
The invention will be further illustrated by the following non-limiting examples, which illustrate the invention.
As shown in fig. 1-6, the invention provides an internal and external fin spiral coil type heat exchanger which is arranged in a reaction kettle, a high temperature area, a medium temperature area and a low temperature area are sequentially arranged in the reaction kettle from bottom to top, the heat exchanger provided by the invention comprises a heat exchange coil 1, an external fin 3, an internal fin 4 and a double-head pipe clamp 5,
the double-ended pipe clamp 5 comprises an upper pipe clamp 52 and a lower pipe clamp 54 which are fixedly connected through double-ended pipe clamp distance bolts 51, wherein the tightness of the upper pipe clamp 52 is adjusted through an upper pipe clamp fixing bolt 54, and the tightness of the lower pipe clamp 54 is adjusted through a lower pipe clamp fixing bolt 55.
The heat exchange coil 1 is the main part of heat exchanger, spiral coiling along reation kettle inner wall 6, every group heat exchange coil 1 contains multilayer layer pipe 2, fixed welding has outer fin 3 and interior fin 4 on the layer pipe 2 for provide high density heat to material reaction zone, simultaneously provide low density heat, heat preservation effect etc. to the other regions of reation kettle, fixed pipeline and the pipe interval through double-end pipe clamp 5 between the adjacent layer pipe 2, to this, the different layer pipe 2 pipe intervals of each region adoption in high temperature zone, well temperature zone and low temperature zone are in order to reach maximum energy utilization, heat exchange coil 1 corresponds the regional high temperature zone heat exchange coil 11, well temperature zone heat exchange coil 12, low temperature zone heat exchange coil 13 that forms. The heat exchange coil 1 is made of stainless steel, alloy steel, carbon steel and the like, for example, the stainless steel is taken as an example, and the common stainless steel pipe mainly has the dimensions of phi 25mmx2mm and phi 38mmx2.5mm, compared with the small pipe diameter, the heat exchange coil can further save materials, increase the heat transfer area and have compact structure. In the embodiment, the diameter of the pipe 2 of the heat exchange coil pipe with the same volume is reduced from phi 38mm to phi 25mm, the material is saved by more than 35%, and the heat transfer area is increased by about 55%.
The outer fins 3 are uniformly distributed along the axial direction of the outer wall of the layer tube 2, the inner fins 4 are uniformly arranged along the inner wall of the layer tube 2, and in order to ensure that the outer fins 31 of the high temperature region on the outer tube wall of the heat exchange coil 11 of the high temperature region are not adhered to each other and ensure enough heat exchange effect, the tube spacing between the layer tubes 2 of the heat exchange coil 11 of the high temperature region can be set to be between a single time and double the tube diameter, and the tube spacing between the layer tubes 2 of the heat exchange coil 11 of the high temperature region is set to be between 25mm and 50mm, so that the tube spacing between the heat exchange coil 12 of the medium temperature region is set to be between 50mm and 100mm, and the tube spacing between the heat exchange coil 13 of the low temperature region is set to be between 100mm and 200mm.
According to the estimation, the heat exchange coils in the same-volume reaction kettle are changed from equal intervals to equal-ratio intervals, so that the materials are saved by more than 50%, and the total process of the heat exchanger is shortened by about one time. Each tube section can be assembled into a proper tube length according to the actual size of each heat exchange area in the reaction kettle, and the coiling diameters of the heat exchange coils of different layers are set according to the structure and the diameter of the reaction kettle, so that the inner wall 6 of the reaction kettle is attached.
The high-temperature area heat exchange coil 11, the medium-temperature area heat exchange coil 12 and the low-temperature area heat exchange coil 13 can be connected in parallel, independent inlet and outlet pipe orifices are respectively arranged, and more accurate temperature control is realized by adjusting the flow and the temperature of heat exchange working media of each pipe section; the pipe sections can also be connected in series by adopting a uniform pipe inlet and outlet, so that the system is convenient and simplified, and the pipe sections are connected by using a mode including but not limited to threads, flanges or welding.
Further, in order to improve the heat exchange efficiency, the outer surface area and the inner surface area of the heat exchange tube are increased through the structures of the outer fins 3 and the inner fins 4 on the surface of the heat exchange coil 1, so that the aim of improving the heat exchange efficiency is fulfilled. The outer fins 3 are axially segmented spiral short fins, the pitch of the outer fins is 1/2 of the diameter of the heat exchange coil 1, the maximum fin height is not more than 1/2 of the tube spacing, and the maximum fin thickness is not more than 2mm; the inner fins 4 include, but are not limited to, straight fins of longitudinal tree type, zigzag type, porous type and the like, and are divided into left and right fins, wherein the left and right fins are arranged in a staggered manner, the staggered distance of the left and right fins is at least 1/5 pipe diameter, each of the left and right fins is a group of inner fins 4, the sizes of the left and right fins are completely equal, the maximum height of the fins can be set to be 1/2 to the size of a single pipe diameter, the sum of the lengths of the left and right fins is at most 4/5 pipe diameter, and the fin thickness is equal to that of the outer fins 3.
The fin number and density distribution of the outer fins 3 and the inner fins 4 are adjusted according to the tube spacing of the heat exchange coil 1.
In the embodiment, the pitch of the outer fins 31 in the high temperature region is 12.5mm, the pitch of the outer fins 32 in the medium temperature region is 25mm, and the pitch of the outer fins 33 in the low temperature region is 50mm;
the fin pitch of the fins 41 in the high temperature region was 10mm, the fin pitch of the fins 42 in the medium temperature region was 20mm, and the fin pitch of the fins 43 in the low temperature region was 40mm. According to the estimation, the outer fins 3 and the inner fins 4 on the same tube side heat exchange coil 1 are changed from equal intervals to equal ratio intervals, so that the material can be saved by about 50%, and the required heat of each heat exchange area can be completely met.
Aiming at part of industrial production reaction kettles, which relate to corrosive chemical raw materials or catalysts, anti-corrosion coatings are sprayed on the surfaces of a heat exchange coil 1 and an outer fin 3, and carbon black, talcum powder and oil are added to increase the anti-rust function. The anticorrosive coating is not limited to scaly graphite, epoxy resin, ceramic material, polymer composite material, etc. In the invention, the outer fins 3 and the inner fins 4 are firstly rolled and formed in sections, then are connected with the pipeline in a welding mode, and finally the pipeline is spirally wound into the heat exchange coil 1 through a coil machine, wherein the welding method comprises, but is not limited to, high-frequency welding, submerged arc welding or laser welding.
Example 2:
the invention also provides an inner and outer fin multi-layer spiral coil heat exchanger as shown in fig. 7-10. The heat exchange coil 1 can be designed into double layers or even multiple layers, taking a double-layer heat exchange coil as an example, the inner layer heat exchange coil 14 mainly provides high-density heat for a heat exchange area, the outer layer heat exchange coil 15 can be used as a heat preservation coil, heat loss is reduced, and meanwhile, the outer coil welding bracket 7 can be connected with a reaction kettle to be used as a rib for reinforcing the whole reaction kettle and used as a bracket for fixing the inner layer heat exchange coil 14.
Since the inner heat exchange coil 14 is a main body of the overall heat exchanger for transferring heat, a larger heat exchange area and heat transfer efficiency are required than the outer heat exchange coil 15, and therefore, the tube spacing, the outer fin spacing, and the inner fin spacing between the tube 2 of the outer heat exchange coil 15 are set to 2 to 4 times that of the inner heat exchange coil 14.
Thus, the tube spacing of the inner heat exchange coil 14 may be set between 25 and 200mm, specifically between 25 and 50mm, between 50 and 100mm for the intermediate temperature zone heat exchange coil 12 and 100 and 200mm for the low temperature zone heat exchange coil 13, according to the desired temperature in the heat exchange zone as described in example 1; the pipe spacing between the pipe 2 of the outer layer heat exchange coil 15 is 50-400mm, specifically, the pipe spacing between the pipe 2 of the high temperature area heat exchange coil 11 of the outer layer heat exchange coil 15 is 50-100mm, the pipe spacing of the medium temperature area heat exchange coil 12 is 100-200mm, and the pipe spacing of the low temperature area heat exchange coil 13 is 200-400mm.
Similarly, the interval distribution of the inner fins and the outer fins on the outer heat exchange coil 15 is 2-4 times that of the inner heat exchange coil 14, specifically, the pitch of the outer fins 31 in the high temperature area of the inner heat exchange coil 14 is 12.5mm, the pitch of the outer fins 32 in the medium temperature area is 25mm, and the pitch of the outer fins 33 in the low temperature area is 50mm; the fin pitch of the fins 41 in the high temperature region is 10mm, the fin pitch of the fins 42 in the medium temperature region is 20mm, and the fin pitch of the fins 43 in the low temperature region is 40mm; the pitch of the outer fins 31 in the high temperature area of the outer heat exchange coil 15 is 25mm, the pitch of the outer fins 32 in the medium temperature area is 50mm, and the pitch of the outer fins 33 in the low temperature area is 100mm; the fin pitch of the fins 41 in the high temperature region is 20mm, the fin pitch of the fins 42 in the medium temperature region is 40mm, and the fin pitch of the fins 43 in the low temperature region is 80mm;
the interval between the inner layer heat exchange coil 14 and the outer layer heat exchange coil 15 between the tubes 2 is larger than twice the fin height of the outer fins 3 of the corresponding tube 2, so that the outer fins 3 between the inner layer heat exchange coil and the outer layer heat exchange coil are not adhered to each other.
The foregoing description of the preferred embodiments of the present invention is not intended to be limiting, but rather, although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (7)
1. The utility model provides an inside and outside fin spiral coil heat exchanger, sets up in reation kettle, has set gradually high temperature zone, medium temperature zone and low temperature zone from down in the reation kettle, its characterized in that:
the heat exchanger comprises at least one group of heat exchange coils which are spiral;
each group of heat exchange coil pipes comprises a plurality of layers of layer pipes, outer fins and inner fins are fixedly welded on the layer pipes, adjacent layer pipes are fixedly connected through double-head pipe clamps, and the heat exchange coil pipes correspond to a high temperature area, a medium temperature area and a low temperature area to form a high temperature area heat exchange coil pipe, a medium temperature area heat exchange coil pipe and a low temperature area heat exchange coil pipe;
tube spacing between tubes of high temperature zone heat exchange coil: the pipe diameter of the pipe is 1:1-2, and the pipe spacing between the pipes of the heat exchange coil in the high temperature area is as follows: tube spacing between tubes of medium temperature zone heat exchange coil: the pipe spacing between the layers of the low temperature zone heat exchange coil is 1:2:4.
2. An inner and outer fin coil heat exchanger as set forth in claim 1, wherein:
the outer fins are uniformly distributed along the axial direction of the outer wall of the layer tube, the pitch of each outer fin is smaller than the tube diameter of the layer tube at the corresponding position, the fin height is smaller than 1/2 of the interval between adjacent layer tubes, and the fin thickness is smaller than the wall thickness of the layer tube;
the inner fins are uniformly arranged on the inner wall of the layer tube, the inner fins are longitudinal tree-shaped straight fins, each group of inner fins comprises a left fin and a right fin, the left fin and the right fin are arranged at equal intervals in a staggered mode, and the sum of the transverse maximum diameters between the left fin and the right fin is smaller than the inner tube diameter of the layer tube.
3. An inner and outer fin coil heat exchanger as claimed in claim 2, wherein: and anti-corrosion coatings are arranged on the heat exchange coil and the outer fins.
4. An inner and outer fin coil heat exchanger as claimed in claim 2, wherein: the high temperature area heat exchange coil, the medium temperature area heat exchange coil and the low temperature area heat exchange coil are connected in series to form an integrated structure, and an inlet pipe and an outlet pipe are arranged on the integrated structure.
5. An inner and outer fin coil heat exchanger as claimed in claim 2, wherein: the high temperature area heat exchange coil, the medium temperature area heat exchange coil and the low temperature area heat exchange coil are connected in parallel, and the ends of the high temperature area heat exchange coil, the medium temperature area heat exchange coil and the low temperature area heat exchange coil are provided with an inlet pipe and an outlet pipe.
6. An inner and outer fin coil heat exchanger according to any one of claims 1 to 5, wherein: the outer fins correspond to the high-temperature zone, the medium-temperature zone and the low-temperature zone to form a high-temperature zone outer fin, a medium-temperature zone outer fin and a low-temperature zone outer fin; tube spacing between tubes of high temperature zone heat exchange coil: pitch of the outer fins in the high temperature region: pitch of the outer fins in the medium temperature zone: the pitch of the fins outside the low temperature area is 2:1:2:4;
the inner fins correspond to the high temperature zone, the medium temperature zone and the low temperature zone to form a high temperature zone inner fin, a medium temperature zone inner fin and a low temperature zone inner fin; tube diameter of the tube: spacing of fins in high temperature zone: spacing of fins in the medium temperature zone: the spacing of the fins in the low temperature zone is 5:2:4:8.
7. An inner and outer fin coil heat exchanger as set forth in claim 6, wherein: the heat exchange coil is provided with at least two groups, the heat exchange coil is sleeved with an inner heat exchange coil and an outer heat exchange coil from inside to outside in sequence, the inner heat exchange coil and the outer heat exchange coil are fixedly connected through a double-head pipe clamp, and the pipe spacing of the outer heat exchange coil is as follows: the pipe spacing of the inner layer heat exchange coil is 2-4:1, and the spacing between the pipe of the inner layer heat exchange coil and the pipe of the outer layer heat exchange coil is larger than the fin height of the double outer fins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310429292.XA CN116447897A (en) | 2023-04-19 | 2023-04-19 | Spiral coil type heat exchanger with inner fins and outer fins |
Applications Claiming Priority (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117190774A (en) * | 2023-08-31 | 2023-12-08 | 南京工业大学 | Steam waste heat recovery device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117190774A (en) * | 2023-08-31 | 2023-12-08 | 南京工业大学 | Steam waste heat recovery device and method |
| CN117190774B (en) * | 2023-08-31 | 2024-05-17 | 南京工业大学 | Steam waste heat recovery device and method |
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