CN205156699U - Double -helical -baffle heat exchanger - Google Patents
Double -helical -baffle heat exchanger Download PDFInfo
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- CN205156699U CN205156699U CN201520784821.9U CN201520784821U CN205156699U CN 205156699 U CN205156699 U CN 205156699U CN 201520784821 U CN201520784821 U CN 201520784821U CN 205156699 U CN205156699 U CN 205156699U
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Abstract
The utility model provides a pull rod that double -helical -baffle heat exchanger, including the heat exchanger shell of both ends fixedly connected with tube sheet, respectively through being used for the distance and a plurality of blocks of plane elliptic sector baffling boards run through that distance sink tube, the central dummy tube that is used for fixing and draw runner setting in heat exchanger shell the heat exchange tube on the tube sheet at heat exchanger shell both ends is fixed respectively at a plurality of blocks of plane elliptic sector baffling boards and both ends, a plurality of blocks of plane elliptic sector baffling boards be in it divide into the double -spiral structure that two helical coiled passage can reduce the leakage current with the shell side to constitute in the heat exchanger shell. The utility model discloses improve the leakage current phenomenon of triangular space, improved heat exchanger heat transmission effect, when reducing the shell side pressure drop, can slow down the dirt deposit, the long period run of assurance equipment.
Description
Technical field
The utility model relates to a kind of spiral baffle heat exchanger.Particularly relate to one and can reduce flow dead and dirt deposition phenomenon double helical baffle heat exchanger.
Background technology
Heat exchanger is as a kind of common apparatus, and be widely used in the fields such as chemical industry, petrochemical industry, medicine, metallurgy, it makes to carry out energy exchange between two or more fluids.Heat exchanger structure pattern is various, wherein shell-and-tube heat exchanger because simple, the heat transfer property of structure better, the feature such as the ripe and strong adaptability of design processing technology and widely applying, wherein adopt segmental baffle supporting construction in the majority with shell side again.
There are some shortcomings in traditional segmental baffle board heat exchangers: shell-side fluid Tortuous flow, and Flow Field Distribution is uneven, and deflection plate leeward side easily causes flow dead; Shell fluid flow resistance is comparatively large, and equipment energy consumption is larger; For the medium containing impurity and easy fouling, easily cause dirt deposition, shorten heat exchanger life cycle.
The water cooler of industrial extensive use, often containing certain impurity in water, segmental baffle structure makes shell side medium form dead band in flow process, cause local velocity lower, thus cause Stickydeposit, easily form underdeposit corrosion, affect the normal operation of equipment.
Arrangement of baffles is become approximate helicoid by helical baffles water cooler, the shell fluid in heat exchanger is made to realize the flowing of approximate helical shape, there will not be the flow dead in segmental baffle board heat exchangers, lower the pressure drop of shell-side, dirt deposition problem can be alleviated simultaneously.Desirable helical baffles is continuous print spiral camber, but due to the processing and manufacturing of spiral camber very difficult, and in the more difficult realization of curved baffle enterprising line pipe hole machined, be difficult to and heat exchanger tube accurate fit.Consider the convenience in processing, therefore adopt a series of elliptic sector flat board to substitute spiral camber.
From combination property, the defects such as resistance large, dead angle is many, the easy incrustation that segmental baffle structure exists can be overcome by spiral baffle supporting structure; But existing various spiral baffle heat exchanger, there is leakage current in various degree in shell side trigonum, heat-transfer effect is low, and the improvement DeGrain of dirt deposition.
Summary of the invention
Technical problem to be solved in the utility model is, under providing a kind of prerequisite ensureing heat exchange property, reducing shell-side pressure drop, slowing down dirt deposition, ensure the double helical baffle heat exchanger of equipment long-term operation.
The technical scheme that the utility model adopts is: a kind of double helical baffle heat exchanger, include the heat exchanger shell that two ends are fixedly connected with tube sheet, respectively by for the pull bar of spacing and distance sink tube, some pieces of planar elliptical segmental baffles in heat exchanger shell are arranged on for fixing center false tube and draw runner, run through described some pieces of planar elliptical segmental baffles and two ends are separately fixed at the heat exchanger tube on the tube sheet at heat exchanger shell two ends, some pieces of described planar elliptical segmental baffles form and are divided into two helical ducts can reduce the double-spiral structure of leakage current shell side in described heat exchanger shell.
Described planar elliptical segmental baffle housing cross-sectional be projected as 1/4 circle.
Described double-spiral structure is arranged by two single coil configuration to form, wherein, each single coil configuration be by some pieces of planar elliptical segmental baffles in described heat exchanger shell with the center line of heat exchanger shell for axis, to be in tilted layout formation by the helical angle of setting, and there is between the adjacent two pieces of planar elliptical segmental baffles in front and back the amount of lap of setting, described two single coil configuration phase difference of two helixes in locus formed of arranging is 180 °.
Described helical angle refers to that formed by the normal of described planar elliptical segmental baffle and the central axis of heat exchanger shell, angle is 15 °-18 °.
Between two pieces of planar elliptical segmental baffles adjacent before and after described amount of lap refers to, equitant area is 20% of a planar elliptical segmental baffle area.
A kind of double helical baffle heat exchanger of the present utility model, tool has the following advantages:
1, compared with single-screw deflection plate, improve the leakage current phenomenon of trigonum, improve heat-transfer effect.Due to single-screw deflection plate geometry reason, fluid, under the guide functions of deflection plate, form approximate helical flow, but segment fluid flow is not along the direction of motion of main flow, but is directly entered next runner from trigonum, center and outer rim overlap.In the utility model, double helix baffle arrangement can make the leakage current of central cam district and outer rim overlap after entering next runner, be subject to the guide functions of another group helical baffles, thus make it helically flow with main flow, thus obviously improve the heat-transfer effect of water cooler.
2, compared with segmental baffle pattern, improve the flow regime of deflection plate leeward side, reduce flow dead and dirt deposition phenomenon.Double helix baffle arrangement of the present utility model can strengthen shell side flow velocity, improves the turbulent extent of fluid, makes shell side Flow Field Distribution more reasonable; Mixing between accelerating fluid, basic flow dead of eliminating deflection plate leeward side, alleviates dirt deposition.Be particularly useful for water recirculator, in the water cooler of the type, normal containing certain impurity in water, segmental baffle structure easily causes local velocity lower, thus cause Stickydeposit, and this double helix baffle arrangement, while reduction shell-side pressure drop, can dirt deposition be slowed down, ensure equipment long-term operation.
Accompanying drawing explanation
Fig. 1 is the internal structure schematic diagram of a kind of double helical baffle heat exchanger of the utility model;
Fig. 2 is the distributed effect figure of concentration of solid particles in numerical simulation segmental baffle water cooler shell side cooling water;
Fig. 3 is the distributed effect figure of concentration of solid particles in numerical simulation double helical baffle heat exchanger shell side cooling water.
In figure
1: tube sheet 2: heat exchanger shell
3: planar elliptical segmental baffle 4: heat exchanger tube
5: pull bar and distance sink tube 6: center false tube
7: draw runner
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, a kind of double helical baffle heat exchanger of the present utility model is described in detail.
As shown in Figure 1, a kind of double helical baffle heat exchanger of the present utility model, include the heat exchanger shell 2 that two ends are fixedly connected with tube sheet 1, respectively by for the pull bar of spacing and distance sink tube 5, some pieces of planar elliptical segmental baffles 3 in heat exchanger shell 2 are arranged on for fixing center false tube 6 and draw runner 7, run through described some pieces of planar elliptical segmental baffles 3 and two ends are separately fixed at the heat exchanger tube 4 on the tube sheet 1 at heat exchanger shell 2 two ends, described planar elliptical segmental baffle 3 housing cross-sectional be projected as 1/4 circle, some pieces of described planar elliptical segmental baffles 3 form and are divided into two helical ducts can reduce the double-spiral structure of leakage current shell side in described heat exchanger shell 2.
Because often containing certain impurity in industrial media, segmental baffle structure makes shell side medium form dead band in flow process, causes local velocity lower, thus causes dirt deposition.Arrangement of baffles is become approximate helicoid by double helical baffle heat exchanger, makes shell fluid realize the flowing of approximate helical shape, eliminates flow dead, lower the pressure drop of shell-side, alleviate dirt deposition.Because the processing and manufacturing of spiral camber is very difficult, and in the more difficult realization of curved baffle enterprising line pipe hole machined, be difficult to and heat exchanger tube accurate fit.Consider the convenience in processing, therefore adopt a series of planar elliptical segmental baffle to substitute spiral camber.
Described double-spiral structure is arranged by two single coil configuration to form, wherein, each single coil configuration be by some pieces of planar elliptical segmental baffles 3 in described heat exchanger shell 2 with heat exchanger shell 2 center line for axis, to be in tilted layout formation by the helical angle of setting, described helical angle refers to that formed by the normal of described planar elliptical segmental baffle 3 and the central axis of heat exchanger shell 2, angle is 15 °-18 °.The determination of concrete helical angle size, it is the concrete condition according to each heat exchanger, adopt method for numerical simulation, under the condition of identical heat exchange area, adjustment helical angle size, make the coefficient of heat transfer of employing double helix baffle arrangement form and adopt the coefficient of heat transfer of segmental baffle version close, and reducing flow dead as far as possible, while ensureing heat transfer effect the best, reducing resistance, reducing the size that dirt deposition determines helical angle.
And, have the amount of lap of setting between two pieces of planar elliptical segmental baffles 3 that front and back are adjacent, between two pieces of planar elliptical segmental baffles 3 adjacent before and after described amount of lap refers to, equitant area is 20% of planar elliptical segmental baffle 3 area.Employing method for numerical simulation optimizes the amount of lap between two pieces of planar elliptical segmental baffles 3, finally determines: when amount of lap is 20% of planar elliptical segmental baffle 3 area, shell side velocity flow profile is relatively uniform; Amount of lap is too small, and leakage current phenomenon is improved not obvious; Amount of lap is excessive, and the flow velocity of nearly wall overlap is very fast, and simultaneously because the helical flow of fluid itself is with certain centrifugal force, thus near causing casing center position, flow velocity is lower; Amount of lap is large in addition, means deflection plate increasing number, can increase the cost of the manufacturing.
Described two single coil configuration phase difference of two helixes in locus formed of arranging is 180 °.Adopt method for numerical simulation to optimize the phase difference of double helix deflection plate, compared with other phase difference angle, shell side coefficient of heat transfer when phase difference is 180 ° is slightly high.And from manufacture and design angle consider, when phase difference is 180 °, the arrangement of deflection plate and the design of distance sink tube more convenient.
Adopt method for numerical simulation, respectively numerical simulation analysis is carried out to the shell fluid flow state of segmental baffle (Fig. 2) and double helix deflection plate (Fig. 3) constitution water cooler.Carry out suitable simplification to water cooler model in simulation process, shell side medium adopts cooling water, and supposes the solid particle containing 5% in the cooling water of shell side import, and simulation solid particle is in the CONCENTRATION DISTRIBUTION of shell side.As shown in Figure 2, for segmental baffle water cooler, there is some difference in the distribution of shell side for concentration of solid particles: due to Action of Gravity Field, solid particle has the deposition of more amount in inner walls the latter half; Also there is a certain amount of solid particle to gather at deflection plate leeward side simultaneously.As shown in Figure 3, in a kind of double helical baffle heat exchanger of the present utility model, by the guide functions of double helix deflection plate, solid particle is comparatively even in the distribution of shell side; Bottom inner walls, gravitate, has sub-fraction solids particles precipitate, and concentration is less than segmental baffle water cooler, shows that double helix baffle arrangement has certain effect to alleviation dirt deposition.
As shown in Figure 1, during a kind of double helical baffle heat exchanger work of the present utility model, medium is entered by shell side inlet A, under the guide functions of planar elliptical segmental baffle 3, forms the flowing of approximate helical shape.Segment fluid flow not along the direction of motion of main flow, but directly enters next runner from trigonum, center and outer rim overlap.This double helix baffle arrangement, can make this part fluid be subject to the guide functions of another group helical baffles, thus make it helically flow with main flow.This double-spiral structure, can mixing between accelerating fluid, and basic flow dead of eliminating deflection plate leeward side, alleviates dirt deposition.Final shell side cooling water flows out by exporting B.A kind of double helical baffle heat exchanger of the present utility model, is applicable to the shell-and-tube heat exchanger of U-shaped tubular type, fixed tube sheet type, floating head type.
Claims (5)
1. a double helical baffle heat exchanger, include the heat exchanger shell (2) that two ends are fixedly connected with tube sheet (1), respectively by for the pull bar of spacing and distance sink tube (5), some pieces of planar elliptical segmental baffles (3) in heat exchanger shell (2) are arranged on for fixing center false tube (6) and draw runner (7), run through described some pieces of planar elliptical segmental baffles (3) and two ends are separately fixed at the heat exchanger tube (4) on the tube sheet (1) at heat exchanger shell (2) two ends, it is characterized in that, some pieces of described planar elliptical segmental baffles (3) form and are divided into two helical ducts can reduce the double-spiral structure of leakage current shell side in described heat exchanger shell (2).
2. a kind of double helical baffle heat exchanger according to claim 1, is characterized in that, described planar elliptical segmental baffle (3) housing cross-sectional be projected as 1/4 circle.
3. a kind of double helical baffle heat exchanger according to claim 1, it is characterized in that, described double-spiral structure is arranged by two single coil configuration to form, wherein, each single coil configuration be by some pieces of planar elliptical segmental baffles (3) in described heat exchanger shell (2) with the center line of heat exchanger shell (2) for axis, to be in tilted layout formation by the helical angle of setting, and there is between the adjacent two pieces of planar elliptical segmental baffles (3) in front and back the amount of lap of setting, described two single coil configuration phase difference of two helixes in locus formed of arranging is 180 °.
4. a kind of double helical baffle heat exchanger according to claim 3, it is characterized in that, described helical angle refers to that formed by the normal of described planar elliptical segmental baffle (3) and the central axis of heat exchanger shell (2), angle is 15 °-18 °.
5. a kind of double helical baffle heat exchanger according to claim 3, it is characterized in that, between two pieces of planar elliptical segmental baffles (3) adjacent before and after described amount of lap refers to, equitant area is 20% of planar elliptical segmental baffle (3) area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520784821.9U CN205156699U (en) | 2015-10-11 | 2015-10-11 | Double -helical -baffle heat exchanger |
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| CN201520784821.9U CN205156699U (en) | 2015-10-11 | 2015-10-11 | Double -helical -baffle heat exchanger |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105202952A (en) * | 2015-10-11 | 2015-12-30 | 中国石油化工股份有限公司 | Double-helix baffle plate heat exchanger |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105202952A (en) * | 2015-10-11 | 2015-12-30 | 中国石油化工股份有限公司 | Double-helix baffle plate heat exchanger |
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