CN112179184B - Double-channel heat exchange device for enhancing heat transfer of pumping intermediate medium - Google Patents
Double-channel heat exchange device for enhancing heat transfer of pumping intermediate medium Download PDFInfo
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- 238000012546 transfer Methods 0.000 title claims abstract description 121
- 238000005086 pumping Methods 0.000 title claims abstract description 17
- 230000002708 enhancing effect Effects 0.000 title description 2
- 230000000712 assembly Effects 0.000 claims abstract description 26
- 238000000429 assembly Methods 0.000 claims abstract description 26
- 238000003860 storage Methods 0.000 claims abstract description 20
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- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims description 29
- 210000004027 cell Anatomy 0.000 claims description 7
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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
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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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
- F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
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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
- F28D7/16—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 arranged in parallel spaced relation
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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
- F28F1/02—Tubular elements of cross-section which is non-circular
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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
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
- F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
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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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Abstract
The invention discloses a double-channel heat exchange device for pumping intermediate medium to enhance heat exchange, which comprises an intermediate medium delivery pump, an intermediate medium storage tank, at least two meandering double-channel convection heat exchange assemblies comprising a plurality of meandering intermediate flowing medium heat transfer double-pipe heat exchange units, wherein the at least two meandering double-channel convection heat exchange assemblies are connected in parallel; the middle flowing medium heat transfer double-pipe heat exchange unit comprises an outer sleeve component, a first heat exchange pipe and a second heat exchange pipe which are arranged in parallel; the intermediate medium transfer pump is used for realizing the circulating flow of the intermediate heat transfer medium between at least two intermediate heat transfer medium cavities connected in parallel and the intermediate medium storage tank, the intermediate heat transfer medium is low in temperature during pumping, and the temperature of the intermediate heat transfer medium is changed from low temperature to high temperature and then changed to low temperature to return to the intermediate medium storage tank through at least two meandering double-channel convection heat exchange assemblies, so that the convection heat exchange of the double-pipe heat exchange unit can be effectively strengthened, the structure is simple, the stability and the reliability are realized, and the high-efficiency heat exchange of sludge and sludge can be realized.
Description
Technical Field
The invention relates to the technical field of organic solid waste treatment and disposal, in particular to a double-channel heat exchange device for strengthening heat transfer of a pumping intermediate medium.
Background
Along with the continuous progress of the social development of China and the increasing improvement of the environmental protection requirement, the treatment of municipal sludge is more and more emphasized, in numerous sludge treatment technologies, in order to effectively promote the treatment speed and degree of the sludge, the sludge needs to be heated to 150-370 ℃, on the other hand, the high-temperature sludge after the reaction treatment needs to be cooled and then subjected to treatment processes such as water filtration and the like, in the processes, the heat energy of the high-temperature sludge after the reaction is fully utilized to heat the low-temperature sludge, and the purposes of saving energy and reducing the operation cost are achieved to the greatest extent. At present, heat exchangers for sludge heat transfer are generally applied, most of the heat exchangers are based on local transformation and updating of industrial and civil produced shell-and-tube heat exchangers, double-tube heat exchangers, plate heat exchangers and the like, and due to inherent characteristics of high viscosity, non-Newtonian fluid characteristics, easiness in deposition, bonding, blockage and the like of sludge, most of the heat exchangers for sludge heat transfer at present have the problems of small effective heat transfer area, low heat exchange efficiency, large resistance, high driving energy consumption for sludge flow and the like.
For the shell-and-tube heat exchanger for sludge heat exchange, because of the inherent structural characteristics of the shell-and-tube heat exchanger, the front end or the rear end tube box of the tube pass has a plurality of flowing dead angles in which fluid is difficult to flow or does not flow basically, and as a result, the sludge does not flow basically or has extremely low flowing speed in the flowing dead angles and adjacent areas, and as a result, the sludge in the non-flowing areas can be gradually bonded along with the moisture migration in the heat exchange process, so that the through-flow section of the heat exchanger becomes smaller continuously, and the heat exchanger is blocked seriously, and the heat exchanger cannot work normally and has to be stopped for maintenance. In addition, the assembly of the shell and tube is complicated, and the overhauling, disassembling and cleaning are also difficult; for the tube side, because there are a plurality of baffling regions that relapse that the baffling board caused in the shell side, mud flows more difficultly, and the dead angle region that flows is more, and deposit and bonding phenomenon are more serious, and the risk of jam is bigger, and heat transfer performance is also worse, therefore, adopt shell and tube heat exchanger to handle the difficult problem that mud heat transfer problem exists and is difficult to overcome.
The common sludge double-pipe heat exchanger also has a plurality of serious problems, particularly the problems of easy sludge layering, uneven flow, deposition and adhesion in a jacket space between the outer wall of the inner pipe and the inner wall of the outer pipe.
For the existing sludge plate type heat exchanger, although the problems of compactness and heat exchange capacity of the heat exchanger are solved, the flow velocity of the channels is relatively small due to the large number of the channels, and the channels between the plates are small, so that the risk of blockage is large, while the flow resistance of the heat exchanger is too large due to the large flow velocity, and even if the design of a wide channel is adopted, the phenomena of sludge deposition, adhesion and heat exchanger blockage are still difficult to avoid.
To sum up, the sludge heat exchanger for municipal sludge treatment at present has the problems of poor deposition, adhesion, blockage and heat exchange capability, short operation and maintenance period, difficulty in maintenance and cleaning, large operation resistance, overlarge power consumption of a delivery pump and the like, which are commonly existed in the sludge heat exchange process due to the structural reason of the heat exchanger.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a double-channel heat exchange device for pumping intermediate medium to enhance heat transfer, wherein the intermediate heat transfer medium circularly flows between at least two parallel intermediate heat transfer medium cavities and an intermediate medium storage tank through an intermediate medium delivery pump, the intermediate heat transfer medium is at a low temperature during pumping, and the temperature of the intermediate heat transfer medium is changed from low temperature to high temperature and then is changed into low temperature to return to the intermediate medium storage tank through at least two meandering convection heat exchange assemblies.
In order to achieve the purpose, the invention provides a double-channel heat exchange device for pumping an intermediate medium to enhance heat exchange, which comprises an intermediate medium delivery pump, an intermediate medium storage tank and at least two meandering double-channel convection heat exchange assemblies arranged in parallel, wherein the intermediate medium delivery pump is connected with the intermediate medium storage tank;
each serpentine double-channel convection heat exchange assembly comprises a plurality of intermediate flowing medium heat transfer double-pipe heat exchange units and a plurality of inter-heat exchange unit connecting pieces located between the adjacent intermediate flowing medium heat transfer double-pipe heat exchange units, and the plurality of intermediate flowing medium heat transfer double-pipe heat exchange units are sequentially connected and communicated in a serpentine mode through the plurality of heat exchange unit piece connecting pieces;
the middle flowing medium heat transfer double-pipe heat exchange unit comprises an outer sleeve pipe assembly and a heat exchange pipe assembly axially arranged in the outer sleeve pipe assembly in a penetrating manner;
the heat exchange tube assembly comprises a first heat exchange tube and a second heat exchange tube, wherein the first heat exchange tube and the second heat exchange tube are axially arranged in parallel, cold materials flow, and the second heat exchange tube is used for heat exchange with the cold materials in the first heat exchange tube so as to heat the cold materials;
the outer sleeve component comprises an outer sleeve and end cover plates for closing openings at two ends of the outer sleeve, a closed middle heat transfer medium cavity is formed between the outer sleeve component and the heat exchange tube component, the middle heat transfer medium cavity is provided with a liquid inlet and a liquid outlet, a middle heat transfer medium is filled in the middle heat transfer medium cavity, and the first heat exchange tube and the second heat exchange tube are immersed in the middle heat transfer medium;
the heat exchange unit inter-connecting piece comprises a first inter-tube connecting piece, a second inter-tube connecting piece and an inter-cavity connecting piece;
the first heat exchange tubes of the plurality of intermediate flowing medium heat transfer double-tube heat exchange units of each serpentine double-channel convection heat exchange assembly are in serpentine communication through first inter-tube connectors to form a cold material serpentine channel in a matched mode, the second heat exchange tubes are in serpentine communication through second inter-tube connectors to form a hot material serpentine channel in a matched mode, and the intermediate heat transfer medium cavities are in serpentine communication through cavity connectors to form a heat transfer medium serpentine channel in a matched mode;
the cold material serpentine channel and the hot material serpentine channel of at least two serpentine double-channel convection heat exchange assemblies are connected in parallel, and the heat transfer medium serpentine channels are connected in series;
the middle heat transfer medium in the middle medium storage tank enters the high-temperature end from the low-temperature end of the middle heat transfer medium serpentine channel of one serpentine double-channel convection heat exchange assembly and flows out under the pumping action of the middle medium conveying pump, then enters the low-temperature end from the high-temperature end of the middle heat transfer medium serpentine channel of the other parallel serpentine double-channel convection heat exchange assembly and flows out, and then flows into the middle medium storage tank to form a closed loop.
Further setting the following steps: and the middle heat transfer medium cavity is also internally provided with a baffle plate for guiding the middle heat transfer medium to perform back-and-forth baffling motion or spiral turbulent flow motion.
Further setting the following steps: the first heat exchange tube and the second heat exchange tube are axially parallel and are abutted and welded to each other.
Further setting the following steps: the cold material flowing direction of the first heat exchange tube in the heat exchange tube assembly in the same group is opposite to the hot material flowing direction in the second heat exchange tube.
Further setting the following steps: and a rotational flow part for guiding materials in the pipe to form mixed rotational flow is arranged in the first heat exchange pipe and/or the second heat exchange pipe, and the rotational flow part is a protruding structure which is formed on the inner wall by sinking the outer wall of the pipe body to the inner wall and is obliquely arranged with the axis of the corresponding pipe body.
Further setting the following steps: the convex structure is one or more of a slanted bar type convex structure, a T-shaped cell combined type convex structure or a spiral type convex structure;
each group of the T-shaped cell combined type protruding structures comprises a plurality of T-shaped cells, and top connecting lines of the T-shaped cells are obliquely arranged with the axis of the corresponding pipe body.
Further setting the following steps: the first heat exchange tube and/or the second heat exchange tube are/is a cross zoom tube, the cross zoom tube is formed by joining a plurality of oval tube body sections with long and short shafts on the tube sections, and the long shafts of the adjacent oval tube body sections are arranged at an angle.
Compared with the prior art, the heat exchange device has a simple and reasonable structure, the heat exchange tube assemblies of the intermediate flowing medium heat transfer double-tube heat exchange unit are immersed in the intermediate heat transfer medium cavity, the heat exchange between the first heat exchange tube and the second heat exchange tube is realized through the flowing heat transfer of the intermediate heat transfer medium, so that the uniformity and the high efficiency of heat exchange are ensured, meanwhile, the intermediate medium conveying pump forces the intermediate heat transfer medium to circularly flow in the whole system, so that the heat balance can be realized, and the intermediate heat transfer medium is low temperature (normal temperature) during pumping and flows back after the temperature is changed from low temperature to high temperature and then from low temperature to low temperature through at least two parallel-connected serpentine double-channel convection heat exchange assemblies, so that the process is easy to realize, stable and reliable; moreover, the pipe body of the heat exchange pipe assembly is in non-sleeved parallel arrangement, the material flow cross section area can be ensured, the flow is uniform and free of dead angles, the cross convergent-divergent pipe structure or the heat exchange pipe with the rotational flow part can effectively avoid blockage, the smoothness of material flow is ensured, and the high efficiency and the stability of the work of the heat exchange device are ensured.
Drawings
FIG. 1 is a schematic structural diagram I of a double-channel heat exchange device for pumping intermediate medium to enhance heat exchange;
FIG. 2 is a schematic structural diagram I of an intermediate flow medium heat transfer double-pipe heat exchange unit;
FIG. 3 is a schematic structural diagram II of an intermediate flow medium heat transfer double-pipe heat exchange unit;
FIG. 4 is a schematic structural diagram of heat exchange units connected by heat exchange unit connecting pieces between two adjacent intermediate flow medium heat transfer double pipes;
FIG. 5 is a schematic view of a heat exchange tube assembly having a swirl portion;
FIG. 6 is a schematic diagram of a heat exchange tube assembly of the cross-zoom tube configuration;
FIG. 7 is a schematic structural diagram of a two-channel heat exchange device for pumping intermediate medium to enhance heat exchange according to the present invention.
The following reference numerals are marked thereon in conjunction with the accompanying drawings:
100. the middle flowing medium heat transfer double-pipe heat exchange unit; 1. an outer sleeve assembly; 11. an outer sleeve; 12. an end cover plate; 2. a heat exchange tube assembly; 21. a first heat exchange tube; 211. a swirling portion; 212. an elliptical tube section; 22. a second heat exchange tube; 3. an intermediate heat transfer medium chamber; 4. a baffle plate; 200. a connecting piece between the heat exchange units; 201. a first inter-pipe connection; 202. a second inter-pipe connection; 203. an inter-cavity connector; 300. a serpentine two-pass convective heat transfer assembly; 400. an intermediate medium storage tank; 500. an intermediate medium delivery pump.
Detailed Description
An embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the embodiment.
The invention discloses a double-channel heat exchange device for pumping intermediate medium to enhance heat exchange, which is shown in fig. 1 to 6 and comprises an intermediate medium conveying pump 500, an intermediate medium storage tank 400, and at least two meandering double-channel convection heat exchange assemblies 300 comprising a plurality of intermediate flowing medium heat transfer double-pipe heat exchange units 100 and a plurality of connecting pieces 200 between the heat exchange units. The heat exchange device comprises a plurality of heat exchange units 100, a plurality of middle flowing medium heat transfer double-pipe heat exchange units, a plurality of heat exchange unit connectors 200, a plurality of heat exchange unit connectors and a plurality of heat exchange unit connectors, wherein the plurality of heat exchange unit connectors are sequentially connected in a serpentine mode (in series) in a serpentine mode to form a main heat exchange part of the heat exchange device, namely a serpentine double-channel convection heat exchange assembly 300; at least two (two or more) serpentine two-pass convective heat exchange assemblies 300 are provided.
Further, as shown in fig. 1, two serpentine two-channel convection heat exchange assemblies 300 connected in parallel are provided, the serpentine two-channel convection heat exchange assemblies 300 are formed by connecting a plurality of intermediate flowing medium heat transfer double-pipe heat exchange units 100 in series, that is, heat medium channels of the intermediate flowing medium heat transfer double-pipe heat exchange units 100 connected in series and communicated with each other to form each serpentine two-channel convection heat exchange assembly 300 are connected in series and communicated with each other, and the refrigerant and the heat medium of the two serpentine two-channel convection heat exchange assemblies 300 connected in parallel are connected and communicated in parallel; the intermediate heat transfer medium is connected and communicated in series in each meandering dual-channel convection heat exchange assembly 300, the intermediate medium between the two meandering dual-channel convection heat exchange assemblies 300 is connected and communicated in a zigzag manner, and the intermediate heat transfer medium enters the high-temperature end from the low-temperature end of one meandering dual-channel convection heat exchange assembly 300 under the pumping action of the intermediate medium conveying pump 500 and then enters the low-temperature end from the high-temperature end of the other meandering dual-channel convection heat exchange assembly 300 connected in parallel and flows out, and then flows into the intermediate medium storage tank 400, namely the intermediate heat transfer medium forms a closed loop among the intermediate medium conveying pump 500, the two meandering dual-channel convection heat exchange assemblies 300 connected in parallel and the intermediate medium storage tank 400, and the intermediate heat transfer medium is at a low temperature (normal temperature) when flowing into one meandering dual-channel convection heat exchange assembly 300 from the intermediate medium storage tank 400 and the intermediate medium conveying pump 500, the medium flows through one meandering two-channel convection heat exchange assembly 300 and then flows out to be high temperature, then the high-temperature intermediate heat transfer medium flows back to the other meandering two-channel convection heat exchange assembly 300 connected in parallel, changes from high temperature to low temperature again, and then flows back to the intermediate medium storage tank 400 to form a closed loop, and the quality and the energy of the intermediate heat transfer medium are conserved. The conveying of middle heat transfer medium of being convenient for like this has simplified equipment manufacturing, has improved the reliable and stable nature of system, makes the refrigerant and the heat medium of winding binary channels convection heat transfer subassembly 300 obtain better heat transfer performance moreover.
It should be noted that: the two (or more) parallel connected meandering dual channel convective heat exchange assemblies 300 may be separate devices, as shown in fig. 1, or may be connected devices, as shown in fig. 7, selected according to the circumstances (such as hoisting, transportation, and field arrangement). When the two meandering two-channel convection heat exchange assemblies 300 connected in parallel are arranged, the heat exchange amount of the two meandering two-channel convection heat exchange assemblies 300 connected in parallel is balanced as much as possible, so that the temperature rise and the temperature drop of the intermediate medium in the two meandering two-channel convection heat exchange assemblies 300 connected in parallel are balanced respectively, and better heat exchange performance is obtained; similarly, when the plurality of serpentine two-channel convective heat exchange assemblies 300 connected in parallel are arranged, the temperature rise and temperature drop of the intermediate medium in the plurality of serpentine two-channel convective heat exchange assemblies 300 connected in parallel are balanced as much as possible, so as to obtain better heat exchange performance. For convenience of description, the term "parallel" or "series" as used herein does not mean "refrigerant" and "heating medium" unless otherwise specified, but does not mean "intermediate medium".
Specifically, as shown in fig. 2 to fig. 3, the above-mentioned intermediate flowing medium heat transfer double-tube heat exchange unit 100 includes an outer sleeve assembly 1 and a heat exchange tube assembly 2 axially penetrating the outer sleeve assembly 1, a closed intermediate heat transfer medium cavity 3 is formed between the outer sleeve assembly 1 and the heat exchange tube assembly 2 in a matching manner, an intermediate heat transfer medium is filled in the intermediate heat transfer medium cavity 3, and the intermediate heat transfer medium cavity 3 has a liquid inlet and a liquid outlet for the intermediate heat transfer medium to flow in and flow out; the outer sleeve component comprises an outer sleeve 11 and an end cover plate 12 for closing openings at two axial ends of the outer sleeve 11, and a closed cavity is formed between the outer sleeve 11 and the end cover plate 12 in a matching manner; the heat exchange tube component 2 axially penetrates through the cavity of the outer sleeve component 1 and comprises a first heat exchange tube 21 and a second heat exchange tube 22 which are arranged in parallel and immersed in a middle heat transfer medium, a first channel for cold material to flow is arranged in the first heat exchange tube 21, a second channel for hot material to flow is arranged in the second heat exchange tube 22, and the hot material in the second heat exchange tube 22 is subjected to heat exchange with the cold material in the first heat exchange tube 21 through interference heat transfer and/or heat transfer of the middle heat transfer medium so as to heat the cold material; preferably, the flow direction of the cold material in the first heat exchange tube 21 is opposite to the flow direction of the hot material in the second heat exchange tube 22 (in a counter-flow arrangement) to obtain a smaller logarithmic mean temperature difference and enhance heat exchange.
In the above solution, as shown in fig. 5 and 6, the first heat exchange tube 21 and the second heat exchange tube 22 in the heat exchange tube assembly 2 may be horizontally arranged at intervals, or may be connected by abutting welding, so that heat can be transferred not only through an intermediate heat transfer medium, but also directly through abutting joints.
In some embodiments, as shown in fig. 5, preferably, a swirling portion 211 for guiding the material in the pipe body to form a mixed swirling flow is provided in the first heat exchange pipe 21 and/or the second heat exchange pipe 22, and the swirling portion 211 is a convex structure formed by an outer wall of the pipe body being inwardly recessed to form on a corresponding inner wall, and arranged obliquely to an axis of the corresponding pipe body; preferably, the protrusion structure can be one or more of a slanted protrusion, a T-cell combined protrusion or a spiral protrusion, wherein each group of T-cell combined protrusions comprises a plurality of T-cells, and top connecting lines of the T-cells in the same group are obliquely arranged with the axis of the corresponding pipe body; so can guide the material in it to form and mix the whirl under the effect of intraductal whirl portion 211, can effectually avoid the material to take place the jam that bias flow, layering, deposit, scaling were in order to cause, the effectual smooth and easy flow of material in the body passageway of having guaranteed.
In some embodiments, as shown in fig. 5, preferably, the first heat exchange tube 21 and/or the second heat exchange tube 22 is a cross-scaled tube capable of guiding the material therein to form a plurality of longitudinal vortexes, the cross-scaled tube is formed by joining a plurality of oval tube sections 212 having long and short axes in tube cross-section and connecting the oval tube sections 212 in an angular arrangement, preferably a 90 ° arrangement, and is manufactured by rolling or molding, and the cross-scaled oval cross-section heat exchange tube (No. CN1145781C, application date: 2000.12.26) described in the issued patent can be used, so that the plurality of longitudinal vortexes can be formed in the tube, thereby effectively preventing the material in the tube from being deflected, layered, deposited and scaled to cause blockage, and effectively ensuring smooth flow of the material in the tube channels.
Specifically, as shown in fig. 4, the inter-heat exchange unit connection member 200 includes a first inter-tube connection member 201, a second inter-tube connection member 202, and an inter-cavity connection member 203, the first inter-tube connection member 201 is used to sequentially connect the first heat exchange tubes 21 of the adjacent intermediate flowing medium heat transfer double-tube heat exchange units 100, the second inter-tube connection member 202 is used to sequentially connect the second heat exchange tubes 22 of the adjacent intermediate flowing medium heat transfer double-tube heat exchange units 100, the inter-cavity connection member 203 is used to sequentially connect the intermediate heat transfer medium cavities 3 of the adjacent intermediate flowing medium heat transfer double-tube heat exchange units 100, such that the first channels of the first heat exchange tubes 21 of the plurality of intermediate flowing medium heat transfer double-tube heat exchange units 100 are sequentially connected and communicated through the first inter-tube connection member 201 to form a continuous cold material channel, the second channels of the second heat exchange tubes 22 of the plurality of intermediate flowing medium heat transfer double-tube heat exchange units 100 are sequentially connected and communicated through the second inter-tube connection member 202 to form a continuous hot material channel, the intermediate heat transfer medium cavities 3 of the plurality of intermediate flowing medium heat transfer double-tube heat exchange units 100 are sequentially connected and communicated through the inter-cavity connecting pieces 203 to form a continuous heat transfer medium channel; the inlet of the heat transfer medium channel is communicated with the outlet of the intermediate medium storage tank 400, the intermediate medium delivery pump 500 is arranged on a pipeline between the inlet and the outlet of the heat transfer medium channel, and the outlet of the heat transfer medium channel is communicated with the inlet of the intermediate medium storage tank 400, so that the intermediate heat transfer medium can be forced to circularly flow in the heat transfer medium channel through the intermediate medium delivery pump 500, the heat transfer is effectively enhanced, and the heat balance of the intermediate heat transfer medium is realized.
In the above scheme, preferably, the wall of the intermediate heat transfer medium chamber 3 is provided with baffle plates 4 for guiding the intermediate heat transfer medium to perform back-and-forth baffle or spiral winding flow in the intermediate heat transfer medium chamber 3, and the baffle plates 4 may be parallel baffle plates 4 alternately arranged on two opposite side walls of the intermediate heat transfer medium chamber 3, or spiral baffle plates 4 spirally arranged along the inner wall of the intermediate heat transfer medium chamber 3, so that the flow of the intermediate heat transfer medium in the intermediate heat transfer medium chamber 3 can be effectively strengthened to improve the heat exchange effect.
Compared with the prior art, the heat exchange device has a simple and reasonable structure, the heat exchange tube assemblies of the intermediate flowing medium heat transfer double-tube heat exchange unit are immersed in the intermediate heat transfer medium cavity, the heat exchange between the first heat exchange tube and the second heat exchange tube is realized through the flowing heat transfer of the intermediate heat transfer medium, so that the uniformity and the high efficiency of heat exchange are ensured, meanwhile, the intermediate medium conveying pump forces the intermediate heat transfer medium to circularly flow in the whole system, so that the heat balance can be realized, and the intermediate heat transfer medium is low temperature (normal temperature) during pumping and flows back after the temperature is changed from low temperature to high temperature and then from low temperature to low temperature through at least two parallel-connected serpentine double-channel convection heat exchange assemblies, so that the process is easy to realize, stable and reliable; moreover, the pipe body of the heat exchange pipe assembly is in non-sleeved parallel arrangement, the material flow cross section area can be ensured, the flow is uniform and free of dead angles, the cross convergent-divergent pipe structure or the heat exchange pipe with the rotational flow part can effectively avoid blockage, the smoothness of material flow is ensured, and the high efficiency and the stability of the work of the heat exchange device are ensured.
The above disclosure is only an example of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art should fall within the scope of the present invention.
Claims (7)
1. A double-channel heat exchange device for pumping intermediate medium to enhance heat exchange is characterized by comprising an intermediate medium delivery pump, an intermediate medium storage tank and at least two meandering double-channel convection heat exchange assemblies which are arranged in parallel;
each meandering double-channel convection heat exchange assembly comprises a plurality of intermediate flowing medium heat transfer double-pipe heat exchange units and a plurality of inter-heat exchange unit connecting pieces located between the adjacent intermediate flowing medium heat transfer double-pipe heat exchange units, and the plurality of intermediate flowing medium heat transfer double-pipe heat exchange units are sequentially connected and communicated in a meandering manner through the plurality of inter-heat exchange unit connecting pieces;
the middle flowing medium heat transfer double-pipe heat exchange unit comprises an outer sleeve pipe assembly and a heat exchange pipe assembly axially arranged in the outer sleeve pipe assembly in a penetrating manner;
the heat exchange tube assembly comprises a first heat exchange tube and a second heat exchange tube, wherein the first heat exchange tube and the second heat exchange tube are axially arranged in parallel, cold materials flow, and the second heat exchange tube is used for heat exchange with the cold materials in the first heat exchange tube so as to heat the cold materials;
the outer sleeve component comprises an outer sleeve and end cover plates for closing openings at two ends of the outer sleeve, a closed middle heat transfer medium cavity is formed between the outer sleeve component and the heat exchange tube component, the middle heat transfer medium cavity is provided with a liquid inlet and a liquid outlet, a middle heat transfer medium is filled in the middle heat transfer medium cavity, and the first heat exchange tube and the second heat exchange tube are both immersed in the middle heat transfer medium;
the heat exchange unit inter-connecting piece comprises a first inter-tube connecting piece, a second inter-tube connecting piece and an inter-cavity connecting piece;
the first heat exchange tubes of the plurality of intermediate flowing medium heat transfer double-tube heat exchange units of each serpentine double-channel convection heat exchange assembly are in serpentine communication through first inter-tube connectors to form a cold material serpentine channel in a matched mode, the second heat exchange tubes are in serpentine communication through second inter-tube connectors to form a hot material serpentine channel in a matched mode, and the intermediate heat transfer medium cavities are in serpentine communication through cavity connectors to form a heat transfer medium serpentine channel in a matched mode;
the cold material serpentine channel and the hot material serpentine channel of at least two serpentine double-channel convection heat exchange assemblies are connected in parallel, and the heat transfer medium serpentine channels are connected in series;
the middle heat transfer medium in the middle medium storage tank enters the high-temperature end from the low-temperature end of the middle heat transfer medium serpentine channel of one serpentine double-channel convection heat exchange assembly and flows out under the pumping action of the middle medium conveying pump, then enters the low-temperature end from the high-temperature end of the middle heat transfer medium serpentine channel of the other parallel serpentine double-channel convection heat exchange assembly and flows out, and then flows into the middle medium storage tank to form a closed loop.
2. The dual-channel heat exchange device for the enhanced heat exchange of the pumped intermediate medium as claimed in claim 1, wherein a baffle plate for guiding the intermediate heat transfer medium to perform a back-and-forth baffling motion or a spiral flow disturbing motion is further arranged in the intermediate heat transfer medium cavity.
3. The dual-channel heat exchange device for the enhanced heat exchange of the pumped intermediate medium as recited in claim 1, wherein the first heat exchange tube and the second heat exchange tube are axially parallel and are connected by butt welding.
4. The dual channel heat exchanger device for enhanced heat exchange of pumped intermediate medium as claimed in claim 1, wherein the first heat exchange tube in the same group of heat exchange tube assemblies has a cold material flow direction opposite to the hot material flow direction in the second heat exchange tube.
5. The dual-channel heat exchange device for the enhanced heat exchange of the pumped intermediate medium as claimed in claim 1, wherein a swirling part for guiding the material in the tube to form a mixed swirling flow is arranged in the first heat exchange tube and/or the second heat exchange tube, and the swirling part is a raised structure which is formed on the inner wall by recessing the outer wall of the tube body towards the inner wall so as to form an inclined arrangement with the axis of the corresponding tube body.
6. The dual-channel heat exchange device for the enhanced heat exchange of the pumped intermediate medium as recited in claim 5, wherein the raised structures are one or more of slanted bar type raised structures, T-cell type raised structures or spiral type raised structures;
each group of the T-shaped cell combined type protruding structures comprises a plurality of T-shaped cells, and top connecting lines of the T-shaped cells are obliquely arranged with the axis of the corresponding pipe body.
7. The dual-channel heat exchange device for the enhanced heat exchange of the pumped intermediate medium as claimed in claim 1, wherein the first heat exchange tube and/or the second heat exchange tube is a cross-scaled tube formed by joining a plurality of oval tube body sections with long and short axes in the tube cross section, and the long axes of the adjacent oval tube body sections are arranged at an angle.
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| CN202011047410.3A CN112179184B (en) | 2020-09-29 | 2020-09-29 | Double-channel heat exchange device for enhancing heat transfer of pumping intermediate medium |
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| CN202011047410.3A CN112179184B (en) | 2020-09-29 | 2020-09-29 | Double-channel heat exchange device for enhancing heat transfer of pumping intermediate medium |
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| CN112179184B true CN112179184B (en) | 2021-08-03 |
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| CN113446872A (en) * | 2021-06-23 | 2021-09-28 | 中国科学院广州能源研究所 | Cold energy recovery device in high-pressure low-temperature liquid gasification and temperature rise process |
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| US8607854B2 (en) * | 2008-11-19 | 2013-12-17 | Tai-Her Yang | Fluid heat transfer device having plural counter flow circuits with periodic flow direction change therethrough |
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| CN112179184A (en) | 2021-01-05 |
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