CN115930641A - High-temperature gas-liquid flat finned tube heat exchanger - Google Patents
High-temperature gas-liquid flat finned tube heat exchanger Download PDFInfo
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- CN115930641A CN115930641A CN202211616770.XA CN202211616770A CN115930641A CN 115930641 A CN115930641 A CN 115930641A CN 202211616770 A CN202211616770 A CN 202211616770A CN 115930641 A CN115930641 A CN 115930641A
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Abstract
The invention relates to a high-temperature gas-liquid flat finned tube heat exchanger, which mainly comprises a gas-phase heat exchange channel and a liquid-phase heat exchange pipeline, wherein the gas-phase heat exchange channel comprises an air inlet interface, a heat exchange box body, a steering flow channel and an air outlet interface; the liquid phase heat exchange pipeline comprises an inlet main pipe, a flow dividing pipe, a flat fin heat exchange pipe, a collecting pipe, an outlet main pipe, a flow isolating plate and the like; the heat exchange box bodies are arranged in parallel, the heat exchange box bodies are connected end to form a multi-pass airflow channel, flat heat exchange finned tubes are arranged in the heat exchange box bodies along the flow direction in a row mode, a liquid phase is uniformly distributed in the flat finned tubes through a liquid phase inlet header pipe and a transverse flow dividing pipe, and gas flows in gaps between adjacent heat exchange surfaces, so that multi-pass countercurrent gas-liquid heat exchange is realized. As more fins can be arranged outside the flat tube, the gas side has higher heat exchange coefficient, and multi-pass pure countercurrent heat exchange is realized, so that higher heat exchange efficiency can be realized, the economic benefit is remarkable, and the heat exchange tube can be widely applied to the high-temperature gas-liquid medium heat exchange process.
Description
Technical Field
The invention relates to the technical field of heat exchangers, in particular to a high-temperature gas-liquid flat finned tube heat exchanger.
Background
A heat exchanger is a device for transferring and exchanging heat between two or more media with different temperatures, and is also called as a heat exchanger. The common heat exchangers include a shell-and-tube heat exchanger, a plate heat exchanger, a double-tube heat exchanger, a spiral tube heat exchanger, a heat pipe heat exchanger and the like, an evaporator and a condenser in a common air conditioner in life also belong to one type of heat exchanger, and the heat exchangers have different characteristics and are suitable for specific occasions. In addition, the fluid can be classified according to the phase state of the fluid, mainly including: various types such as liquid-liquid, liquid-gas, liquid-vapor, gas-gas, gas-vapor, gas-liquid, etc.; the gas-liquid heat exchange is characterized in that the gas-side thermal resistance is far greater than the liquid-side thermal resistance, so that the gas-side thermal resistance can be reduced by increasing the heat exchange area by additionally arranging fins, and the heat exchange is enhanced.
The heat exchangers currently available for gas-liquid heat exchange are mainly serpentine finned tube heat exchangers. The heat exchanger of the coil pipe arranges the heat exchange tube into the snakelike shape, the working medium is liquid in the tube, the working medium is gaseous outside the tube, because the heat exchange coefficient of the gas side is greatly lower than the heat exchange coefficient of the liquid side, arrange different forms of fin in order to increase the heat transfer area and reduce the thermal resistance outside the tube wall usually, this kind of heat exchanger is mainly applied to various air coolers and economizers and energy-savers on industrial furnace and boiler industrially, but this kind of heat exchanger also has some problems in the use, mainly have: (1) the liquid has a longer flow path, a larger inlet-outlet temperature difference can be obtained, but the gas flow path is shorter, the temperature rise obtained by the gas is limited, (2) because the heat exchange tube has a circular tube structure, the fin rate is usually lower than 10, and the heat exchange coefficients of the gas side and the liquid side generally differ by 50-100 times, the resistance of the heat exchange process is still at the gas side even if the gas side is provided with fins, (3) the gas and the liquid are cross flow, the heat exchange coefficient is further reduced, and (4) the problem of free expansion on the structure cannot be solved when the temperature of the gas-liquid is very high. Therefore, the main technical problems to be solved at present are: (1) the structure of the heat exchange tube is changed, the fin rate of the air side is further improved to reduce the thermal resistance of the air side, and the maximum heat transfer coefficient is obtained, (2) the whole structure arrangement is changed, so that the gas-liquid is subjected to multi-pass pure countercurrent heat exchange, and (3) the high-temperature heat exchange tube and the box body can freely expand to eliminate thermal stress.
The current power grid system has different production and life periods, and great peak-valley difference is generated in the daytime and at night. Because the price of the valley electricity is very low, the valley electricity is utilized to heat the fused salt to high temperature at night for storing heat and energy, and then the high-temperature fused salt is released by heat storage to meet various process requirements at the peak of electricity and steam consumption in the daytime, so that better economic benefits can be obtained, and more attention is paid at present. The high temperature air can be used for spray drying, high temperature pyrolysis of organic matters, combustion-supporting low-heat value fuel, treatment of toxic and harmful gases and the like. The heat exchanger is particularly suitable for high-temperature molten salt-air heat exchange, has high heat transfer efficiency, can solve the expansion problem, and can obtain high-temperature air with the temperature of more than 400 ℃ and be applied to various high-temperature process flows.
Summary of the invention
The technical problems to be solved by the invention are as follows: aiming at the problems and the defects of the prior art, the invention provides the high-temperature gas-liquid flat finned tube heat exchanger which further increases the heat exchange area at the gas side so as to improve the total heat transfer coefficient and solve the problem of thermal expansion in the heat exchange process.
The technical scheme adopted by the invention for solving the technical problem is as follows: a high-temperature gas-liquid flat finned tube heat exchanger comprises a gas-phase heat exchange channel and a liquid-phase heat exchange pipeline, wherein the gas-phase heat exchange channel comprises a gas inlet interface, a plurality of heat exchange box bodies, a steering flow channel and a gas outlet interface, the box bodies are arranged in parallel along the flow direction of gas flow, two adjacent heat exchange box bodies are mutually communicated through the steering flow channel, the inlet of each heat exchange box body is connected with the gas inlet interface, and the outlet of each heat exchange box body is communicated with the outlet interface;
liquid phase heat transfer pipeline includes inlet header pipe, shunt tubes, flat heat exchange tube, heat transfer fin, collecting pipe, export house steward and separate and flow the board, inlet header pipe arranges heat transfer box entrance point in, the shunt tubes have a plurality of and parallel arrangement, and both ends seal to pass in the heat transfer box and with the fixed intercommunication of inlet header pipe, flat heat exchange tube has a plurality of and following flow direction array arrangement in the heat transfer box, flat heat exchange tube's entrance point and the fixed intercommunication of shunt tubes, flat heat exchange tube's exit end and the fixed intercommunication of collecting pipe, the collecting pipe has a plurality of and parallel arrangement, and both ends seal to pass in the heat transfer box and with the fixed intercommunication of export house steward, the export house steward arranges heat transfer box exit end in.
In some preferred embodiments, the heat exchange fins are multiple and are fixedly arranged on two sides of the flat heat exchange tube along the flow direction, and the heat exchange fins are positioned in the heat exchange box body.
Preferably, in some embodiments, the heat exchange fin is at least one of a straight slit fin and a corrugated fin, the straight slit fin is provided with a plurality of protruding slits at intervals and is arranged in a staggered manner, the straight slit fin is used for generating turbulent flow to gas to break a thermal boundary layer, the corrugated fin is symmetrically and fixedly arranged on two sides of the flat heat exchange tube, a convergent-divergent flow channel is formed between two adjacent corrugated fins, and the convergent-divergent flow channel is used for accelerating and decelerating airflow to obtain strong disturbance.
In some preferred embodiments, the flow dividing pipe is axially provided with a plurality of semicircular slots at intervals, the width of each semicircular slot is equal to the height of the inner side of the flat heat exchange tube, the inlet end of the flat heat exchange tube is provided with a through hole, the flow dividing pipe vertically intersects with the through hole at the inlet end of the flat heat exchange tube, the semicircular slots are communicated with the flat heat exchange tube, and the semicircular slots are used for dividing liquid into the flat tubes.
In some preferred embodiments, the manifold is provided with a plurality of semicircular slots at intervals along the axial direction, the width of each semicircular slot is equal to the height of the inner side of the flat heat exchange tube, the outlet end of the flat heat exchange tube is provided with a through hole, the manifold perpendicularly intersects with the through hole at the outlet end of the flat heat exchange tube, the semicircular slots are communicated with the flat heat exchange tube, and the semicircular slots are used for converging liquid into the manifold.
In some preferred embodiments, the inlet header pipe and the outlet header pipe are both provided with flow separation plates, and the flow separation plates are used for reversing media in the flat heat exchange pipes in two adjacent heat exchange boxes.
Preferably, expansion joints are arranged at two ends of the heat exchange box body, and the expansion joints are perpendicular to the axial direction of the heat exchange box body and are fixedly and hermetically connected with the heat exchange box body.
Preferably, in some embodiments, the outer surface of the heat exchange box body is covered with an insulating layer.
In some preferred embodiments, an access door which can be opened and closed is arranged on the diversion flow channel back plate.
The invention has the beneficial effects that:
1. the liquid medium and the gas medium can realize parallel and opposite flow directions, realize pure reverse flow between the two media and obtain larger average heat transfer temperature difference.
2. The flow direction of the liquid medium and the flow direction of the gas medium are respectively changed through the flow separating plate on the distribution header pipe and the turning channel on the heat exchange box body, multi-pass heat exchange between the media is realized, and the media can have larger inlet and outlet temperature difference.
3. The flat finned tubes are adopted, fins in different positions and shapes are arranged on the side faces of the flat tubes, so that the heat exchange area of a gas medium side is increased, the disturbance of a gas boundary layer is enhanced, the thermal resistance of a gas side is reduced, and the maximum heat transfer coefficient is obtained.
4. The expansion joint is arranged on the heat exchange box body, so that the gas side and the liquid side can be expanded freely, the thermal stress generated in the heat exchange process is eliminated, and the heat exchange box is suitable for heat exchange between high-temperature media. For example, high temperature air can be obtained with high temperature molten salts.
5. The arrangement of the flat finned tubes is fixed by the medium distributing and collecting transverse tubes, and the inlet and outlet distribution header pipes are used as the supporting structure of the whole heat exchanger, so that the material is saved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic view of the overall structure of the heat exchanger according to the present invention;
FIG. 2 isbase:Sub>A cross-sectional view taken along line A-A of the embodiment of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of the embodiment of FIG. 1;
FIG. 4 is a cross-sectional view taken along line C-C of the embodiment of FIG. 1;
FIG. 5 is a cross-sectional view taken along line D-D of the embodiment of FIG. 1;
FIG. 6 is a first schematic view of a manifold, flat heat exchange tubes and corrugated fin structure and connection;
FIG. 7 is a second schematic view of a manifold, flat heat exchange tubes and corrugated fin structure and connection;
FIG. 8 is a first schematic view of a flow dividing tube, a flat heat exchange tube and a straight slit fin structure and connection structure;
fig. 9 is a schematic diagram of a second structure of the shunt tubes, the flat heat exchange tubes and the straight slit fins and the connection structure.
In the figure: 1. the heat exchange device comprises a gas-phase heat exchange channel 11, an air inlet interface 12, a heat exchange box body 13, a steering flow channel 14, an air outlet interface 15 and an expansion joint;
2. liquid phase heat exchange pipeline, 21, inlet manifold, 22, shunt tubes, 23, flat heat exchange tubes, 24, heat exchange fins, 241, straight slit fins, 242, corrugated fins, 25, collecting tubes, 26, outlet manifold, 27 and flow partition plates.
Detailed Description
The invention is described in more detail below with reference to the following examples:
the present invention is not limited to the following embodiments, and those skilled in the art can implement the present invention in other embodiments according to the disclosure of the present invention, or make simple changes or modifications on the design structure and idea of the present invention, and fall into the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
As shown in fig. 1 to 9, a high-temperature gas-liquid flat finned tube heat exchanger comprises a gas-phase heat exchange channel 1, a liquid-phase heat exchange pipeline 2 and a heat insulation layer, wherein the gas-phase heat exchange channel 1 comprises a gas inlet interface 11, a heat exchange box body 12, a turning flow channel 13, a gas outlet interface 14 and an expansion joint 15;
the liquid phase heat exchange pipeline 2 comprises an inlet header pipe 21, a shunt pipe 22, flat heat exchange pipes 23, heat exchange fins 24, a collecting pipe 25, an outlet header pipe 26 and a flow partition plate 27;
the heat exchange box bodies 12 are arranged in parallel along the airflow direction, the inlet of the head end heat exchange box body 12 is connected with the air inlet interface 11, two adjacent heat exchange box bodies 12 are communicated through a turning flow channel 13, and the outlet of the tail end heat exchange box body 12 is communicated with the outlet interface 14.
The inlet header pipe 21 is arranged on two sides of the inlet end of the heat exchange box body 12, the shunt tubes 22 are arranged in parallel, two ends of the shunt tubes 22 penetrate through the heat exchange box body 12 in a sealing mode and are fixedly communicated with the inlet header pipe 21, the flat heat exchange tubes 23 are arranged in the heat exchange box body 12 in an array mode in the flow direction, n flat heat exchange tubes 23 are arranged on the cross section of the heat exchange box body 12 in the transverse direction and m flat heat exchange tubes 23 are arranged in the longitudinal direction, the inlet end of each flat heat exchange tube 23 is fixedly communicated with the shunt tubes 22, the outlet end of each flat heat exchange tube 23 is fixedly communicated with the confluence tube 25, the confluence tube 25 is arranged in parallel and is arranged in a sealing mode, two ends of each confluence tube 25 penetrate through the heat exchange box body 12 and are fixedly communicated with the outlet header pipe 26, the outlet header pipe 26 is arranged at the outlet end of the heat exchange box body 12, and the heat preservation layer covers the outer surface of the heat exchange box body 12 and the outer sides of all other pipelines.
A plurality of heat exchange fins 24 are fixedly arranged on two sides of the flat heat exchange tube 23 along the flow direction, the heat exchange fins 24 are positioned in the heat exchange box body 12, and the heat exchange fins 24 are at least one of straight slit fins 241 and corrugated fins 242;
the plurality of corrugated fins 242 are symmetrically arranged on two sides of the flat heat exchange tube 23 along the flow direction to form a convergent-divergent flow channel, so that the gas generates strong turbulent flow to destroy a thermal boundary layer, and the heat exchange effect is enhanced.
The plurality of straight slit fins 241 are arranged on two sides of the flat heat exchange tube 23 along the flow direction, and a plurality of convex slits are arranged on the straight slit fins 241 at intervals and are arranged in a staggered manner, so that gas generates turbulent flow to damage a thermal boundary layer, heat exchange is enhanced, and the heat exchange coefficient is improved.
The collecting pipe 25 is provided with a plurality of semi-circular grooves with the width equal to the height of the inner side of the flat heat exchange pipe 23 at intervals along the axial direction, meanwhile, the outlet end of the flat heat exchange pipe 23 is provided with a through hole, the collecting pipe 25 is vertically intersected with the inlet through hole of the flat finned pipe 23, the semi-circular grooves are communicated with the flat finned pipe 23, liquid is converged into the flat pipe, and a good converging effect is obtained.
The shunt tubes 22 are axially provided with a plurality of semicircular grooves at intervals, the width of each semicircular groove is equal to the height of the inner side of each flat heat exchange tube 24, the inlet ends of the flat fins 24 are provided with through holes, the shunt tubes vertically intersect with the inlet through holes of the flat finned tubes, the semicircular grooves are communicated with the flat finned tubes, liquid is shunted into the flat tubes, and good shunt is obtained.
An access door which can be opened and closed is arranged on the rear plate of the steering flow channel 13.
The invention relates to a working process of a high-temperature gas-liquid flat finned tube heat exchanger, which comprises the following steps:
firstly, assuming that a liquid medium is a hot fluid which needs heat release and temperature reduction, and a gas medium is a fluid which needs temperature rise, a high-temperature liquid medium flows into each row of liquid shunting horizontal tubes from a distribution header pipe, then flows into flat finned tubes, then enters a liquid converging horizontal tube, and finally flows out from the header pipe through converging;
the gas medium enters from the side surface below the shell of the heat exchanger, the gap between the two heat exchange planes is a channel of the gas medium, and the high-temperature gas obtained by heat absorption of the whole process flows out from the side surface above the shell. The flow directions of the two fluid media form parallel and opposite correspondence, and a pure countercurrent flow heat exchange mode is carried out; and the flow directions of the liquid medium and the gas medium are respectively changed through the partition plate on the distribution header pipe and the turning flow channels on the two ends of the heat exchange box body, so that the multi-pass heat exchange between the media is realized.
In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that numerous changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. The utility model provides a flat finned tube heat exchanger of high temperature gas-liquid, includes gaseous phase heat transfer passageway (1) and liquid phase heat transfer pipeline (2), its characterized in that: the gas-phase heat exchange channel (1) comprises a plurality of air inlet interfaces (11), heat exchange box bodies (12), turning flow channels (13) and air outlet interfaces (14), the box bodies (12) are arranged in parallel along the airflow direction, two adjacent heat exchange box bodies (12) are communicated with each other through the turning flow channels (13), the inlet of each heat exchange box body (12) is connected with the air inlet interface (11), and the outlet of each heat exchange box body (12) is communicated with the outlet interface (14);
liquid phase heat exchange pipeline (2) are including inlet manifold (21), shunt tubes (22), flat heat exchange tube (23), heat transfer fin (24), collector pipe (25), export house steward (26) and flow isolating plate (27), heat transfer box (12) entrance point is arranged in inlet manifold (21), shunt tubes (22) have a plurality ofly and parallel arrangement, and both ends seal pass in heat transfer box (12) and with inlet manifold (21) fixed intercommunication, flat heat exchange tube (23) have a plurality ofly and arrange in heat transfer box (12) along the flow direction array, the entrance point and the fixed intercommunication of shunt tubes (22) of flat heat exchange tube (23), the exit end and collector pipe (25) of flat heat exchange tube (23) are fixed the intercommunication, collector pipe (25) have a plurality ofly and parallel arrangement, and both ends seal pass in heat transfer box (12) and with export house steward (26) fixed intercommunication, heat transfer box (12) exit end is arranged in to export house steward (26).
2. A high temperature gas-liquid flat finned tube exchanger as set forth in claim 1 wherein: the heat exchange fins (24) are multiple and fixedly arranged on two sides of the flat heat exchange tubes (23) in the flow direction, and the heat exchange fins (24) are positioned in the heat exchange box body (12).
3. A high temperature gas-liquid flat finned tube exchanger as set forth in claim 2 wherein: the heat exchange fin (24) is at least one of a straight slit fin (241) and a corrugated fin (242), the straight slit fin (241) is provided with a plurality of protruding slits at intervals and is arranged in a staggered mode, the straight slit fin (241) is used for generating turbulent flow to gas to break a thermal boundary layer, the corrugated fins (242) are symmetrically and fixedly arranged on two sides of the flat heat exchange tube (23), a convergent-divergent flow channel is formed between every two adjacent corrugated fins (242), and the convergent-divergent flow channel is used for accelerating and decelerating the gas flow to obtain strong disturbance.
4. A high temperature gas-liquid flat finned tube exchanger as set forth in claim 1 wherein: open the semicircle seam that has a plurality of widths and flat heat exchange tube (23) inboard height to equal on shunt tubes (22) along the axial interval, open flat heat exchange tube (23) entrance point has the through-hole, shunt tubes (22) intersect perpendicularly and the through-hole of flat heat exchange tube (23) import end department, semicircle seam and flat heat exchange tube (23) intercommunication, the semicircle seam is arranged in with liquid reposition of redundant personnel to flat tube (23).
5. A high temperature gas-liquid flat finned tube exchanger according to claim 4 wherein: the liquid collecting device is characterized in that semicircular gaps which are equal in height and are formed in the inner sides of a plurality of widths and flat heat exchange tubes (23) are formed in the collecting tube (25) at intervals along the axial direction, through holes are formed in outlet ends of the flat heat exchange tubes (23), the collecting tube (25) is vertically intersected with the through holes in outlet ends of the flat heat exchange tubes (23), the semicircular gaps are communicated with the flat heat exchange tubes (23), and the semicircular gaps are used for converging liquid into the collecting tube (25).
6. A high temperature gas-liquid flat finned tube exchanger as set forth in claim 1 wherein: flow separation plates (27) are arranged in the inlet header pipe (21) and the outlet header pipe (26), and the flow separation plates (27) are used for reversing media in the flat heat exchange tubes (23) in the two adjacent heat exchange boxes (12).
7. A high temperature gas-liquid flat finned tube exchanger as set forth in claim 1 wherein: expansion joints (15) are arranged at two ends of the heat exchange box body (12), and the expansion joints (15) are perpendicular to the heat exchange box body (12) in axial arrangement and are fixedly and hermetically connected with the heat exchange box body.
8. A high temperature gas-liquid flat finned tube exchanger as claimed in claim 1 wherein: the outer surface of the heat exchange box body (12) is covered with a heat preservation layer.
9. A high temperature gas-liquid flat finned tube exchanger according to any one of claims 1 to 8 wherein: an access door capable of being opened and closed is arranged on the rear plate of the steering flow channel (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211616770.XA CN115930641A (en) | 2022-12-15 | 2022-12-15 | High-temperature gas-liquid flat finned tube heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211616770.XA CN115930641A (en) | 2022-12-15 | 2022-12-15 | High-temperature gas-liquid flat finned tube heat exchanger |
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| Publication Number | Publication Date |
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| CN115930641A true CN115930641A (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211616770.XA Pending CN115930641A (en) | 2022-12-15 | 2022-12-15 | High-temperature gas-liquid flat finned tube heat exchanger |
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| CN (1) | CN115930641A (en) |
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2022
- 2022-12-15 CN CN202211616770.XA patent/CN115930641A/en active Pending
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