CN211120750U - Longitudinal flow shell pass type heat exchanger with multiple U-shaped heat exchange tubes - Google Patents

Longitudinal flow shell pass type heat exchanger with multiple U-shaped heat exchange tubes Download PDF

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CN211120750U
CN211120750U CN201921650936.3U CN201921650936U CN211120750U CN 211120750 U CN211120750 U CN 211120750U CN 201921650936 U CN201921650936 U CN 201921650936U CN 211120750 U CN211120750 U CN 211120750U
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heat exchange
exchange tubes
baffle
shaped
heat exchanger
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王永庆
王珂
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Zhengzhou University
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Zhengzhou University
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Abstract

The utility model provides a longitudinal flow shell side heat exchanger of many U-shaped heat exchange tubes, including casing, pipe case, tube sheet, many U-shaped heat exchange tubes and fluid redistribution device, to being provided with pin-connected panel longitudinal flow strutting arrangement of heat exchange tube equidistant in the casing, pin-connected panel longitudinal flow strutting arrangement includes the baffling circle of assembling and forming and installs a plurality of parallel arrangement's in the baffling circle baffling pole by two piece at least circular arc subsections head and the tail, the horn mouth structure that fluid redistribution device includes annular installation base and reduces along shell side flow direction, install longitudinal baffle in the heat exchange tube clearance that many U-shaped heat exchange tubes formed, set up the logical liquid hole of perpendicular to face on the longitudinal baffle. The heat exchanger solves the problem that a plurality of U-shaped heat exchange tubes are difficult to install, improves a fluid bypass between the tube bundle and the shell, eliminates the short circuit of fluid flow of the U-shaped innermost tube of the tube bundle and strengthens the heat transfer capacity.

Description

Longitudinal flow shell pass type heat exchanger with multiple U-shaped heat exchange tubes
Technical Field
The utility model relates to a heat exchanger, specific theory has related to a longitudinal flow shell side heat exchanger of many U-shaped heat exchange tubes.
Background
Shell and tube heat exchangers are one of the most widely used heat exchangers in industrial process heat transfer. The applicable operating temperature and pressure range is large, the manufacturing cost is low, the cleaning is convenient, the treatment capacity is large, the work is reliable, a lot of experience has been accumulated in the aspects of design, processing and manufacturing for a long time, and the shell-and-tube heat exchanger is often the most widely applied heat exchanger.
In the design of a traditional shell-and-tube heat exchanger, when the shell-and-tube structure is fixed and the tube pass flow is small, a multi-tube-pass structure is often adopted to increase the flow speed of fluid in a heat exchange tube bundle, and a U-shaped heat exchange tube heat exchanger is a common form of a multi-tube-pass heat exchanger.
The U-shaped tube type heat exchanger refers to a heat exchanger with a tube bundle composed of U-shaped tubes with different bent tube radiuses, and two ends of each tube are fixed on the same tube plate. Because each U-shaped pipe can freely stretch out and draw back, the temperature difference stress can not be produced between the tube bundle and the shell.
If the number of tube passes is three or more and a U-shaped tube heat exchanger is still adopted, the traditional bow-shaped baffle plate cannot be arranged in the middle of the tube bundle due to the arrangement of the U-shaped elbows at the two ends of the shell pass of the heat exchanger, so that the U-shaped heat exchange tube cannot be adopted.
Therefore, when the number of tube passes is three or more, only a normal straight heat exchanger can be used, and a partition plate needs to be arranged in a tube box in a matching manner to realize the fluid flow of multiple tube passes.
In order to solve the above problems, people are always seeking an ideal technical solution.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the not enough of prior art to a longitudinal flow shell side formula heat exchanger of many U-shaped heat exchange tubes convenient to installation many U-shaped heat exchange tubes, optimization shell side fluidic flow structure, attenuate heat transfer boundary layer, reinforcing heat transfer coefficient is provided.
In order to realize the purpose, the utility model discloses the technical scheme who adopts is: the utility model provides a shell side formula heat exchanger of shell, pipe case, tube sheet and many U-shaped heat exchange tubes, the casing both ends are arranged in to pipe case and tube sheet branch, and many U-shaped heat exchange tubes are arranged inside the casing, and the casing to being provided with pin-connected panel longitudinal flow strutting arrangement to many U-shaped heat exchange tubes equidistant, pin-connected panel longitudinal flow strutting arrangement includes the baffling pole of assembling the ring that forms and installing a plurality of parallel arrangement in the baffling ring by two piece at least circular arc subsections head and the tail, the inboard of baffling ring corresponds the baffling pole is equipped with the mounting hole, the baffling circles and sets up pull rod perforation structure, and under the mosaic structure, can be suitable for the installation of many U-shaped heat exchange tubes, improves the manufacture condition, and when can avoiding the big difference in temperature in the heat exchanger in addition, the difference in temperature stress between tube bank and the.
Basically, it still includes fluid redistribution device, fluid redistribution device includes annular installation base and the horn mouth structure that reduces along shell side flow direction, cooperates vertical flow strutting arrangement, makes shell side fluid be longitudinal flow, and the baffling pole that the heat exchange tube arranged all around forms the kaimen vortex street, makes shell side fluid high efficiency erode the heat exchange tube wall, effectively thins heat transfer boundary layer, strengthens coefficient of heat transfer.
Basically, install longitudinal baffle in the U-shaped inlayer heat exchange tube clearance that many U-shaped heat exchange tubes formed, set up the through-flow hole perpendicular to face on the longitudinal baffle, the surface of longitudinal baffle is adhered to and is had the vortex arch, eliminates the U-shaped inlayer tube fluid flow short circuit of tube bank, improves the whole average velocity of flow of shell side, and the intensive heat transfer, the purpose in through-flow hole is for balanced pressure, and the bellied purpose of vortex is in order to increase baffle surface fluid's disturbance, the intensive heat transfer.
Basically, the diameter of each baffle rod is set according to the size of a gap between the passing heat exchange tubes.
Basically, the joints of the arc subsections of the baffling ring are in tongue-and-groove fit or concave-convex structure fit or are connected through bolts.
Basically, the installation base is installed at the lateral part of baffling circle.
Basically, the small opening edge of the fluid redistribution device is a straight edge or a petal shape or a trapezoid shape or a rectangle shape.
Basically, the longitudinal baffle is a light plate or a hollow plate.
Basically, the installation base is an annular flat plate, and the annular flat plate is provided with a connecting rod hole for penetrating through the pull rod.
The utility model discloses relative prior art has substantive characteristics and progress, specific theory, the utility model has the advantages of it is following:
1. the assembled longitudinal flow supporting device is designed, the problem that the traditional bow-shaped baffle plate cannot be installed from two ends is solved, the sizes of the baffle rods are different, fluid is in longitudinal flow along the axial direction of the shell according to the gap arrangement of the heat exchange tubes, the shell-side fluid falls off through the vortex at the supporting rod and the Venturi effect at the baffle ring, vortex wake flow is generated behind the shell-side fluid, so that heat transfer is strengthened, and after the strength of the vortex is weakened, the fluid generates new vortex and throttling through the baffle element behind the shell-side fluid; meanwhile, the baffle rod can support the heat exchange pipe from different angles.
2. The fluid redistribution device is arranged to improve a fluid bypass between the tube bundle and the shell, so that the bypass fluid between the tube bundle and the shell flows to the tube bundle part and is converged with the longitudinal flow after the baffle rod structure, the flushing of the fluid near the heat exchange tube to the heat exchange tube is strengthened, the heat transfer boundary layer near the tube wall is thinned, and the heat exchange efficiency is improved.
3. The longitudinal baffle is arranged, so that the short circuit of fluid flow of the U-shaped innermost pipe of the pipe bundle is eliminated, the integral average flow velocity of the shell pass is improved, and the heat transfer is enhanced; the liquid through holes can maintain the pressure balance at the two sides of the baffle plate, and the stress and the vibration of the whole baffle plate are reduced; the turbulence protrusions play a role in increasing the disturbance capacity of fluid on the surface of the baffle, enhancing heat transfer and removing and preventing scale.
Drawings
Fig. 1 is a schematic view of the overall structure of the longitudinal flow shell-side heat exchanger with multiple U-shaped heat exchange tubes of the present invention.
Fig. 2 is a schematic structural view of the middle assembled longitudinal flow support device of the present invention.
Fig. 3 is a schematic structural view of the fluid redistribution device of the present invention.
Fig. 4 is a schematic structural diagram of the assembled structure of the present invention.
Fig. 5 is a schematic view of the structure of the longitudinal baffle.
Fig. 6 and 7 are schematic structural views of the guide shell.
In the figure: 1. a housing; 2. a pipe box; 3. a tube sheet; 4. a plurality of U-shaped heat exchange tubes; 5. an assembled longitudinal flow support device; 5-1, arc subsections; 5-2. baffle ring; 5-3, a rod baffle; 5-4, mounting holes; 6. a fluid redistribution device; 6-1, installing a base; 6-2. a bell mouth structure; 6-3, connecting rod holes; 7. a longitudinal baffle; 8. a liquid through hole; 9. and (4) turbulent flow bulges.
Detailed Description
The technical solution of the present invention will be described in further detail through the following embodiments.
As shown in figures 1 and 2, the longitudinal flow shell side heat exchanger with the multiple U-shaped heat exchange tubes comprises a shell 1, a tube box 2, a tube plate 3 and multiple U-shaped heat exchange tubes 4, wherein the tube box 2 and the tube plate 3 are respectively arranged at two ends of the shell, the multiple U-shaped heat exchange tubes 4 are arranged inside the shell, an assembled longitudinal flow supporting device 5 is arranged in the shell at equal intervals aiming at the multiple U-shaped heat exchange tubes 4, the assembled longitudinal flow supporting device 5 comprises a baffle ring 5-2 formed by assembling at least two circular arc sub-sections 5-1 end to end and a plurality of baffle rods 5-3 arranged in the baffle ring 5-2 in parallel, the inner side of the baffle ring is provided with mounting holes 5-4 corresponding to the baffle rods, and the joint of the circular arc sub-sections 5-1 of the baffle ring is in tenon-groove fit or concave-convex structure fit or is connected through bolts, so that the assembled baffle ring has good stability, Rigidity and reliability; the diameter of each baffle rod 5-3 is set according to the size of a gap between the passing heat exchange tubes; the baffle rods of two adjacent assembled longitudinal flow supporting devices are arranged in a staggered mode, and the heat exchange pipes are supported from different angles.
During installation, the multiple U-shaped heat exchange tubes can be installed firstly, then the deflection rods with proper sizes penetrate through gaps of the heat exchange tubes, the corresponding circular arc sub-sections 5-1 are installed in a segmented mode and are spliced and formed, and the two ends of the deflection rods are inserted into the corresponding grooves of the inner rings of the deflection rings 5-2, so that the deflection rods are fixed.
The end face of the baffle ring 5-2 is provided with a pull rod hole, or the inner ring is provided with a connecting lug which is provided with a pull rod hole, thereby realizing the fixation of the inner pull rod, the distance tube and the like.
The structure effectively solves the problem that the traditional bow-shaped baffle plate cannot be directly installed when facing a plurality of U-shaped heat exchange tubes, and the problem of supporting the heat exchange tubes and the shell.
As shown in fig. 3 and 4, the heat exchanger further comprises a fluid redistribution device 6, the fluid redistribution device comprises an annular mounting base 6-1 and a bell mouth structure 6-2 which is reduced along the shell side flow direction, the mounting base 6-1 is an annular flat plate, a connecting rod hole 6-3 which is used for penetrating a pull rod is formed in the annular flat plate, the mounting base is mounted on the side portion of a baffling ring, the small opening edge of the fluid redistribution device is straight edge or petal shape or trapezoid shape or rectangle shape, the fluid is made to flow longitudinally by matching with a longitudinal flow supporting device 5, the baffling rods 5-3 which are arranged around a heat exchange tube form a karman vortex street, the shell side fluid is made to efficiently scour the heat exchange tube wall, the heat transfer boundary layer is effectively thinned, and the heat exchange coefficient is enhanced.
The action principle of the fluid redistribution device is as follows: when the tube bundle can not fill the whole shell, a gap between the tube bundle and the shell can be passed by the bypass fluid, and the bypass fluid can not effectively flow through the heat exchange tube, so that a flowing short circuit is formed. After the fluid redistribution device is added, by the action of the bell mouth structure, the bypass fluid between the tube bundle and the shell flows to the tube bundle and is converged with the longitudinal flow behind the baffle rod structure, so that the erosion of the fluid near the heat exchange tube to the heat exchange tube is strengthened, the heat transfer boundary layer near the wall of the thinned tube is reduced, and the heat exchange efficiency is strengthened.
The transition form from the large opening to the small opening of the bell mouth can be a straight line or a curve, and the edge shape of the bell mouth adapts to the arrangement of the heat exchange tube.
As shown in fig. 5, further, a longitudinal baffle 7 is installed in a heat exchange tube gap formed by the multiple U-shaped heat exchange tubes 4, a liquid through hole 8 perpendicular to the plate surface is formed in the longitudinal baffle 7, a turbulence protrusion 9 is attached to the surface of the longitudinal baffle 7, and the longitudinal baffle 7 is a light plate or a hollow plate.
The action principle of the longitudinal baffle is as follows: due to the limitation of the curvature radius of the bent pipe, the distance between the U-shaped innermost layer pipes of the pipe bundle is large, and the shell-side fluid is easy to form short circuit at the part and is unfavorable for heat transfer. Therefore, the longitudinal baffle is added, the short circuit of the fluid is eliminated, the integral average speed of the shell side is improved, and the heat transfer is enhanced.
The liquid through holes are used for maintaining the pressure balance at the two sides of the baffle plate and reducing the stress and vibration of the baffle plate; the turbulence protrusions can increase the disturbance of fluid on the surface of the baffle, and the protrusion positions play a role in strengthening heat exchange for the periphery of the heat exchange tube.
As shown in fig. 6 and 7, in order to prevent the direct washing of the heat exchange tube bundle after the fluid enters the heat exchanger, a guide cylinder structure is added at the inlet and the outlet of the heat exchanger, so that the shell-side fluid is uniformly distributed, the heat transfer area of the shell-side inlet section is fully utilized, and the functions of reducing the heat transfer dead zone and preventing the inlet section from generating fluid vibration are also achieved.
The utility model provides a heat exchanger structure has simple structure, the operation degree of difficulty, heat exchange efficiency height, shock resistance can be good, shell side pressure reduces, the advantage that anti-scaling performance is strong, only a tube sheet, and sealed face is few, and the operation is reliable, and the cost is low, and the tube bank can extract, washs outstanding advantage such as convenient.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.

Claims (10)

1. The utility model provides a longitudinal flow shell side heat exchanger of many U-shaped heat exchange tubes, includes casing, pipe case, tube sheet and many U-shaped heat exchange tubes, its characterized in that: the utility model discloses a baffle ring, including baffle ring, baffle rod, baffle ring, U-shaped heat exchange tube, shell, to being provided with pin-connected panel vertical flow strutting arrangement to many U-shaped heat exchange tubes equidistant, pin-connected panel vertical flow strutting arrangement includes the baffle ring that forms and installs a plurality of parallel arrangement's in the baffle ring by assembling at least two blocks of circular arc subsections head and tail, the inboard of baffle ring corresponds the baffle rod is equipped with the mounting hole, the baffle is circled and is set up pull rod perforation structure.
2. The longitudinal flow shell-side heat exchanger with multiple U-shaped heat exchange tubes as recited in claim 1, wherein: it also includes a fluid redistribution means comprising an annular mounting base and a flared structure that narrows in the shell-side flow direction.
3. A longitudinal flow shell-side heat exchanger with multiple U-shaped heat exchange tubes according to claim 1 or 2, wherein: and a longitudinal baffle is arranged in a gap between the U-shaped innermost heat exchange tubes formed by the plurality of U-shaped heat exchange tubes, and a liquid through hole vertical to the plate surface is formed in the longitudinal baffle.
4. A longitudinal flow shell side heat exchanger with multiple U-shaped heat exchange tubes as claimed in claim 3, wherein: the diameter of each baffle rod is set according to the size of a gap between the heat exchange tubes passing through.
5. A longitudinal flow shell-side heat exchanger with multiple U-shaped heat exchange tubes according to claim 1, 2 or 4, wherein: the joints of the arc subsections of the baffling ring are in tongue-and-groove fit or concave-convex structure fit or are connected through bolts.
6. The longitudinal flow shell-side heat exchanger with multiple U-shaped heat exchange tubes as recited in claim 2, wherein: the baffle rods of two adjacent assembled longitudinal flow supporting devices are arranged in a staggered manner.
7. The longitudinal flow shell-side heat exchanger with multiple U-shaped heat exchange tubes as recited in claim 6, wherein: the small opening edge of the fluid redistribution device is straight or petal-shaped or trapezoid-shaped or rectangular.
8. A longitudinal flow shell side heat exchanger with multiple U-shaped heat exchange tubes as claimed in claim 3, wherein: turbulence protrusions are attached to the surface of the longitudinal baffle.
9. The longitudinal flow shell-side heat exchanger with multiple U-shaped heat exchange tubes as recited in claim 8, wherein: the longitudinal baffle is a light plate or a hollow plate.
10. A longitudinal flow shell-side heat exchanger with multiple U-shaped heat exchange tubes according to claim 2, 6 or 7, wherein: the mounting base is an annular flat plate, and a connecting rod hole for penetrating through the pull rod is formed in the annular flat plate.
CN201921650936.3U 2019-09-30 2019-09-30 Longitudinal flow shell pass type heat exchanger with multiple U-shaped heat exchange tubes Active CN211120750U (en)

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Application Number Priority Date Filing Date Title
CN201921650936.3U CN211120750U (en) 2019-09-30 2019-09-30 Longitudinal flow shell pass type heat exchanger with multiple U-shaped heat exchange tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921650936.3U CN211120750U (en) 2019-09-30 2019-09-30 Longitudinal flow shell pass type heat exchanger with multiple U-shaped heat exchange tubes

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110595234A (en) * 2019-09-30 2019-12-20 郑州大学 Longitudinal flow shell pass type heat exchanger with multiple U-shaped heat exchange tubes
CN112762739A (en) * 2021-01-29 2021-05-07 华中科技大学 Combined spiral baffle heat exchanger

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110595234A (en) * 2019-09-30 2019-12-20 郑州大学 Longitudinal flow shell pass type heat exchanger with multiple U-shaped heat exchange tubes
CN112762739A (en) * 2021-01-29 2021-05-07 华中科技大学 Combined spiral baffle heat exchanger

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