CN203454859U - Novel laminated sheet type longitudinal flow heat exchanger - Google Patents

Abstract

The utility model discloses a novel laminated longitudinal flow heat exchanger, which comprises a shell, a heat exchange tube, a left tube plate and a right tube plate welded at both ends of the shell, and each piece of heat exchanger arranged in the shell and separated by a certain gap. The laminations are parallelly placed on the heat exchange tubes. The laminations make the holes of the heat exchange tubes closely contact with the heat exchange tubes through the integral expansion of the tubes. The left tube plate is connected by bolts to the water inlet cover with the water inlet and the water outlet. , the right tube plate is connected to the return water cover by bolts, there are shell-side fluid inlets and shell-side fluid outlets above or below both ends of the shell, a leak port is set on the bottom of the shell, and the laminations are provided with holes to allow the flow from the shell The shell-side fluid flowing into the shell-side fluid inlet flows longitudinally along the axial direction of the heat exchanger to the longitudinal orifice of the shell-side fluid outlet. There is a certain space at both ends of the shell side to allow the shell-side fluid to flow in and out evenly. The utility model has the advantages of simple process and low cost, increased heat transfer area per unit volume, compact and efficient structure, strong pressure resistance and wide application range.

Description

A New Type Laminated Longitudinal Flow Heat Exchanger

technical field

The utility model relates to a laminated heat exchanger, in particular, the fluid in the shell side adopts a longitudinal flow type to reduce the pressure drop loss of the shell side of the heat exchanger and improve the comprehensive heat transfer performance of the shell side of the heat exchanger.

Background technique

Heat exchanger is an important unit equipment in oil refining, chemical industry, environmental protection, energy, electric power and other industries, especially shell-and-tube heat exchangers are widely used. Traditional shell-and-tube heat exchangers use arcuate partitions as the support between the tubes, and the fluid scours the tube bundles laterally, which is prone to induced vibration, has a flow dead zone, and has a large pressure drop loss on the shell side. Based on the heat transfer characteristics of shell-and-tube heat exchange, many scholars have studied the enhanced heat transfer technology inside and outside the tube, and achieved fruitful results. The research on enhanced heat transfer in the shell side of the shell-and-tube heat exchanger mainly focuses on two aspects: on the one hand, the surface structure of the heat exchange tube is changed to enhance heat transfer, such as threaded tube, finned tube, nail head tube, etc.; on the other hand, Change the support method of heat exchange tubes, thereby improving the form and distribution of fluid flow in the shell side to achieve the purpose of enhancing heat transfer, such as spiral baffle support structure, baffle rod support structure, disc ring support structure, mesh orifice plate support structures, etc.

Laminated heat exchangers are mainly used in air conditioning engineering, refrigeration engineering, etc., and belong to the category of finned tube heat exchangers. Generally, the laminated heat exchanger mostly adopts a whole piece of rectangular laminations with openings. The laminations are large in size. The heat exchange tubes are connected in a U-shape without a shell. The fluid outside the tubes is generally air and sweeps across the tube bundle. Although the heat exchange area is large, the U-shaped connection process of the heat exchange tubes is complicated to manufacture, and the heat exchanger is large in size and generally has a rectangular parallelepiped structure, which is only suitable for medium and low pressure applications. At present, there are also patented shell-and-tube heat exchangers in the form of laminations and bow-shaped baffles. The shell-side fluid flows in a cross-flow form. However, due to the small spacing and large number of laminations, the shell-side pressure drop of the heat exchanger is large. It can only be used in a small flow range or a small size range, and the lamination needs to be cut out of the baffle area, which greatly reduces the utilization rate of the material, thus limiting the advantages of high heat transfer efficiency and small volume of the laminated heat exchanger .

Utility model content

In view of the above existing problems, the utility model aims to solve the above technical problems to a certain extent.

The purpose of the utility model is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and provide a novel laminated longitudinal flow heat exchanger and its enhanced heat transfer method. flow, when the shell-side fluid passes through the opening, a jet flow is generated, and the turbulent intensity of the shell-side fluid is enhanced to realize enhanced heat transfer. Moreover, the shell-side fluid flows longitudinally between the heat exchange tube bundles, which can reduce the shell-side pressure drop.

The technical scheme that the utility model solves its technical problem adopts is:

A new type of laminated longitudinal flow heat exchanger, including shell, heat exchange tubes, left tube plate and right tube plate welded at both ends of the shell, each piece arranged in the shell and separated by a certain gap is parallelly sleeved on the heat exchanger. The lamination on the heat pipe, the lamination makes the heat exchange tube hole and the heat exchange tube closely contact through the integral expansion tube, the left tube plate is connected with the water inlet cover with the water inlet and the water outlet by bolts, and the right pipe The plate is connected to the return water cover by bolts, and there are shell-side fluid inlets and shell-side fluid outlets above or below both ends of the shell, and a leak port is set on the bottom of the shell. The shell-side fluid flows longitudinally along the axial direction of the heat exchanger to the longitudinal orifice of the shell-side fluid outlet, and a certain space is provided at both ends of the shell so that the shell-side fluid is evenly distributed between the laminations, effectively improving Convective heat transfer in heat exchangers.

Further, the cross-sectional profiles of the laminations and the casing (8) may be circular or rectangular.

Further, the heat exchange tube holes on the laminations can adopt triangular tube layout, square tube layout or tube layout transposed by 45°. the

Further, the shape of the longitudinal flow hole on the lamination can be circular, square, rectangular or splined.

Further, the ratio of the diameter of the circular longitudinal orifice to the outer diameter of the heat exchange tube is 0.3 to 0.42 for the triangular arrangement; the ratio of the diameter of the circular longitudinal orifice to the outer diameter of the heat exchange tube is The ratio is 0.4~0.72.

Further, the ratio of the diameter of the inscribed circle of the square longitudinal flow hole to the outer diameter of the heat exchange tube is 0.3-0.42 when the tubes are arranged in a triangular shape; The ratio of the outer diameter of the heat exchange tube is 0.4~0.72.

Further, when the ratio of the center distance of the heat exchange tube holes on the laminate to the outer diameter of the heat exchange tube is greater than 1.5, the number of rectangular longitudinal flow holes between adjacent heat exchange tube holes on the laminate is 3 to 6, and the aspect ratio 2~6, the longitudinal flow holes can be placed vertically or horizontally; when the ratio of the center distance of the heat exchange tube holes on the lamination to the outer diameter of the heat exchange tube is less than 1.5, the rectangular longitudinal flow holes between the adjacent heat exchange tube holes on the lamination The number is 1~2, and the aspect ratio is 2~4. the

Further, the ratio of the circumscribed circle diameter of the spline-shaped longitudinal orifice to the outer diameter of the heat exchange tube is 0.3-0.42 for triangular tube arrangement; the circumscribed circle diameter of the spline-shaped longitudinal orifice for square or transposed 45° tube arrangement The ratio to the outer diameter of the heat exchange tube is 0.4~0.72.

Further, the lamination material can be pure aluminum, aluminum alloy, copper alloy and stainless steel, and the interval between laminations is 1.5-6 mm.

Further, the heat exchanger is a single shell pass, and the tube pass can be one pass, two pass or four pass; the heat exchanger can be installed horizontally or vertically.

The heat exchanger includes a circular shell, circular section laminations, heat exchange tubes, and water inlets and outlets; a rectangular section shell, rectangular section laminations, heat exchange tubes, and water inlets and outlets can also be used.

In addition to the heat exchange tube holes, the laminations also have longitudinal flow holes of different forms, and the shell-side fluid flows through the longitudinal flow holes of the laminations along the axial direction of the heat exchanger to realize longitudinal flow. The laminations and heat exchange tubes are connected as a whole by means of expansion joints and placed in the shell without baffle support in the middle.

The high-temperature fluid of the laminated longitudinal flow heat exchanger enters the shell from the shell-side fluid inlet, realizes longitudinal flow through different forms of longitudinal flow holes opened by the laminations, and then flows out from the shell-side fluid outlet; the low-temperature water flows from the water inlet It flows into the heat exchange tube, and flows out from the water outlet after going back and forth in the return water cover for a specified number of times. The high-temperature fluid releases heat to lower the temperature, and the low-temperature water absorbs heat and the temperature rises to achieve the heat exchange effect. The shell-side high-temperature fluid flows longitudinally through the longitudinal holes of the laminates, and compared with the laminated cross-flow heat exchanger, the pressure drop is smaller under the same conditions.

The shell-side fluid flows through the lamination openings along the axial direction of the heat exchanger to achieve longitudinal flow; due to the sudden change in the flow area, the shell-side fluid generates jets when passing through the longitudinal holes of the laminations, which strengthens the fluid turbulence; and because The laminations are placed on the heat exchange tubes with a certain gap, so the shell-side fluid can periodically generate jets, which continuously enhances the overall turbulent intensity of the shell-side fluid, thereby greatly improving the heat transfer film coefficient of the shell side and strengthening the Shell side heat transfer.

The advantages and beneficial effects of the utility model are: the shell side fluid of the heat exchanger flows longitudinally between the laminations, which can reduce the pressure drop of the shell side; The periodic disturbance of the fluid improves the shell-side heat transfer film coefficient and enhances heat transfer; the laminations are manufactured by integral stamping and forming, and compared with the existing laminated cross-flow heat exchanger, the laminations do not need to be cut out for bow-shaped baffles area, the process is simple, the material is saved, the utilization rate of the laminated material is improved, the heat transfer area per unit volume is increased, and the structure is more compact and efficient; Wider range.

Description of drawings

Fig. 1 is a structural schematic diagram of Embodiment 1 of the utility model when the cross-section of the shell side is circular.

Fig. 2 is a partial plan view of the lamination in Fig. 1 when a circular longitudinal orifice is opened.

Fig. 3 is a partial plan view of the second laminated sheet of the embodiment of the present invention when a square longitudinal orifice is opened.

Fig. 4 is a partial plan view of opening rectangular longitudinal flow holes when the ratio between the center distance of the opening of the heat exchange tube and the outer diameter of the heat exchange tube is less than 1.5 in the embodiment of the utility model.

Fig. 5 is a partial plan view of rectangular longitudinal flow holes when the ratio between the center distance of the opening of the heat exchange tube and the outer diameter of the heat exchange tube is greater than 1.5 in the embodiment of the utility model.

Fig. 6 is a partial plan view of the spline-shaped longitudinal orifice of the laminations according to Embodiment 5 of the present invention.

Fig. 7 is a schematic structural view of the sixth embodiment of the utility model when the cross-section of the shell side is rectangular.

The figure shows: 1. Water outlet, 2. Water inlet, 3. Water inlet cover, 4. Left tube plate, 5. Shell side fluid inlet, 6. Lamination, 61. Heat exchange tube hole, 62. Longitudinal Orifice, 7. Heat exchange tube, 8. Shell, 9. Shell side fluid outlet, 10. Right tube plate, 11. Return water cover, 12. Leakage port.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail.

Embodiment one

As shown in Figures 1 and 2, a new laminated longitudinal flow heat exchanger includes a shell 8, a heat exchange tube 7, a left tube plate 4 and a right tube plate 10 welded to both ends of the shell 8, and is arranged on The laminations 6 in the casing 8 are placed on the heat exchange tube 7 in parallel with a certain gap. The tube plate 4 is connected with a water inlet cover 3 with a water inlet 2 and a water outlet 1 by bolts, the right tube plate 10 is connected with a return water cover 11 by bolts, and a shell-side fluid is provided above or below both ends of the shell 8 The inlet 5 and the shell-side fluid outlet 9, the bottom of the shell 8 is provided with a leak port 12, and the lamination 6 is opened to allow the shell-side fluid flowing in from the shell-side fluid inlet 5 to flow longitudinally along the axial direction of the heat exchanger to The longitudinal flow hole 62 of the shell-side fluid outlet 9 and the two ends of the shell 8 are provided with a certain space, so that the shell-side fluid is evenly distributed between the laminations 6, and the convective heat transfer of the heat exchanger is effectively improved.

The cross-sectional profiles of the laminations 6 and the casing 8 are circular.

The heat exchange tube holes 61 on the laminations can adopt triangular tube layout, square tube layout or tube layout transposed by 45°.

As shown in Figure 2, the shape of the longitudinal orifice 62 is circular, and the ratio of the diameter of the longitudinal orifice 62 to the diameter of the heat exchange tube 7 is 0.3 to 0.42 when the triangular tubes are arranged; The ratio of the diameter of the longitudinal flow hole 62 to the outer diameter of the heat exchange tube 7 is 0.4-0.72 when the tube is arranged.

The material of the laminations 6 can be pure aluminum, aluminum alloy, copper alloy and stainless steel, and the distance between the laminations 6 is 1.5-6 mm.

The heat exchanger is a single shell pass, and the tube pass can be one pass, two passes or four passes; the heat exchanger can be installed horizontally or vertically.

The high-temperature fluid of the laminated longitudinal flow heat exchanger described in this embodiment enters the shell 8 from the shell-side fluid inlet, realizes longitudinal flow through the different forms of longitudinal flow holes 62 opened in the lamination 6, and then flows out from the shell-side fluid outlet The low-temperature water flows into the heat exchange tube from the water inlet, and flows out from the water outlet 1 after going back and forth in the return water cover 11. The high-temperature fluid releases heat to reduce the temperature, and the low-temperature water absorbs heat and the temperature rises to achieve the heat exchange effect. The shell-side high-temperature fluid flows longitudinally through the longitudinal holes of the laminates, and compared with the laminated cross-flow heat exchanger, the pressure drop is smaller under the same conditions.

The shell-side fluid flows through the lamination openings along the axial direction of the heat exchanger to achieve longitudinal flow; due to the sudden change in the flow area, the shell-side fluid generates jets when passing through the longitudinal holes of the laminations, which strengthens the fluid turbulence; and because The laminations are placed on the heat exchange tube layer by layer, so the shell-side fluid can periodically generate jets, which continuously enhances the overall turbulent intensity of the shell-side fluid, thereby greatly improving the heat transfer film coefficient of the shell side and strengthening the shell side. process heat transfer.

Embodiment two

As shown in Figure 3, the difference between this embodiment and Embodiment 1 is that the shape of the longitudinal flow hole 62 is a square, and the ratio of the diameter of the inscribed circle of the square longitudinal flow hole 62 to the diameter of the heat exchange tube 7 when the tubes are arranged in a triangle 0.3-0.42; the ratio of the diameter of the inscribed circle of the square longitudinal orifice 62 to the outer diameter of the heat exchange tube (7) is 0.4-0.72 when the tubes are arranged in a square shape or transposed by 45°.

Embodiment Three

As shown in Figure 4, the difference between this embodiment and Embodiment 1 is that the ratio between the center distance of the opening of the heat exchange tube on the laminate and the outer diameter of the heat exchange tube is less than 1.5, the shape of the longitudinal flow hole 62 is a rectangle, and the aspect ratio The number of longitudinal flow holes 62 between adjacent heat exchange tube holes 61 on the lamination 6 is 1 to 2, arranged vertically. It is suitable for occasions where the heat exchange tubes 7 are arranged relatively closely. the

Embodiment Four

As shown in Figure 5, the difference between this embodiment and Embodiment 1 is that the ratio of the center distance of the heat exchange tube holes 61 on the lamination 6 to the outer diameter of the heat exchange tube 7 is greater than 1.5, and the adjacent heat exchange tube holes on the lamination 6 The vertical flow holes 62 between 61 are rectangular, the number is 3-6, and the aspect ratio is 2-6. Each vertical flow hole 62 is placed horizontally, which is suitable for occasions where the heat exchange tubes 7 are arranged sparsely.

Embodiment five

As shown in Figure 6, the difference between this embodiment and Embodiment 1 is that the shape of the longitudinal orifice 62 is spline-shaped, and the diameter of the circumscribed circle of the spline-shaped longitudinal orifice 62 is the same as that of the heat exchange tube 7 when the tubes are arranged in a triangular shape. The ratio of the diameters is 0.3-0.42; the ratio of the diameter of the circumscribed circle of the spline-shaped longitudinal orifice 62 to the outer diameter of the heat exchange tube 7 is 0.4-0.72 when the pipes are arranged in a square or transposed at 45°.

Embodiment six

As shown in Figure 7, the difference between this embodiment and Embodiment 1 is that: the cross-sectional profile of the housing 8 and the lamination 6 is rectangular, and the shape and layout of the longitudinal flow holes on the lamination can be set as the aforementioned circular, Square, rectangular or splined.

The above-mentioned embodiments of the present utility model are only examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the utility model shall be included in the protection scope of the claims of the utility model.

Claims (10)

1. A new type of laminated longitudinal flow heat exchanger, including a shell (8), heat exchange tubes (7), left tube sheets (4) and right tube sheets (10) welded to both ends of the shell (8) 1. The laminations (6) arranged in the housing (8) and separated by a certain gap are placed on the heat exchange tubes (7) in parallel. The laminations (6) make the heat exchange tube holes (61) is in close contact with the heat exchange tube (7), the left tube plate (4) is connected with the water inlet cover (3) with the water inlet (2) and the water outlet (1) by bolts, and the right tube plate ( 10) The return water cover (11) is connected by bolts, the shell side fluid inlet (5) and the shell side fluid outlet (9) are provided above or below both ends of the shell (8), and the bottom of the shell (8) is provided with a leakage port (12), which is characterized in that: the lamination (6) is provided with a shell-side fluid flowing in from the shell-side fluid inlet (5) to flow longitudinally along the axial direction of the heat exchanger to the shell-side fluid outlet (9 ), a certain space is provided at both ends of the shell side to allow the fluid in the shell side to flow in and out evenly. 2. The novel laminated longitudinal flow heat exchanger according to claim 1, characterized in that: the cross-sectional profiles of the laminated sheets (6) and the shell (8) can be circular or rectangular. 3. The novel laminated longitudinal flow heat exchanger according to claim 1 or 2, characterized in that: the heat exchange tube holes (61) on the laminates can adopt triangular arrangement, square arrangement or transpose 45 ° Pipeline. 4. The novel laminated longitudinal flow heat exchanger according to claim 3, characterized in that: the shape of the longitudinal flow holes (62) on the laminated sheets can be circular, square, rectangular or splined. 5. The novel laminated longitudinal flow heat exchanger according to claim 4, characterized in that: the ratio of the diameter of the circular longitudinal flow hole (62) to the outer diameter of the heat exchange tube (7) is 0.3~ 0.42; The ratio of the diameter of the circular longitudinal orifice (62) and the outer diameter of the heat exchange tube (7) is 0.4 to 0.72 when the square pipe is arranged or the pipe is transposed at 45 °. 6. The novel laminated longitudinal flow heat exchanger according to claim 4, characterized in that: the ratio of the diameter of the inscribed circle of the square longitudinal flow hole (62) to the outer diameter of the heat exchange tube (7) when the tubes are arranged in a triangular shape It is 0.3 ~ 0.42; The ratio of the inscribed circle diameter of the square longitudinal orifice (62) and the outer diameter of the heat exchange tube (7) is 0.4 ~ 0.72 when the square pipe is arranged or the pipe is transposed at 45°. 7. The novel laminated longitudinal flow heat exchanger according to claim 4, characterized in that: when the ratio between the center distance of the heat exchange tube hole (61) on the laminate (6) and the outer diameter of the heat exchange tube (7) is greater than 1.5, the number of rectangular longitudinal flow holes (62) between adjacent heat exchange tube holes (61) on the lamination (6) is 3 to 6, the aspect ratio is 2 to 6, and the longitudinal flow holes (62 ) can be placed vertically or horizontally; when the ratio between the center distance of the heat exchange tube holes (61) on the lamination (6) and the outer diameter of the heat exchange tube (7) is less than 1.5, the adjacent heat exchange tube holes ( The number of rectangular longitudinal orifices (62) between 61) is 1~2, and the aspect ratio is 2~4. 8. The novel laminated longitudinal flow heat exchanger according to claim 4, characterized in that: the ratio of the diameter of the circumscribed circle of the spline-shaped longitudinal flow holes (62) to the outer diameter of the heat exchange tubes (7) when the triangular tubes are arranged It is 0.3～0.42; The ratio of the circumcircle diameter of the spline-shaped longitudinal orifice (62) and the outer diameter of the heat exchange tube (7) is 0.4～0.72 when the square pipe is arranged or the pipe is transposed at 45°. 9. The novel laminated longitudinal flow heat exchanger according to claim 1 or 2, characterized in that: the material of the laminated sheets (6) can be pure aluminum, aluminum alloy, copper alloy and stainless steel, and the laminated sheets ( 6) The spacing is 1.5~6mm. 10. The new laminated longitudinal flow heat exchanger according to claim 1 or 2, characterized in that: the heat exchanger is a single shell pass, and the tube pass can be one pass, two passes or four passes; the heat exchange The device can be installed horizontally and vertically.

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