Plate sheet with lung-like structure and plate heat exchanger

Abstract

The invention discloses a plate sheet with a lung-shaped imitating structure and a plate heat exchanger, and relates to the technical field of heat exchange equipment, the plate sheet comprises a lung-shaped imitating plate sheet, and the lung-shaped imitating structure is arranged on the lung-shaped imitating plate sheet; a plurality of groups of turbulent flow columns are arranged on the front surface and the back surface of the lung-like plate sheet, and are arranged along the two longitudinal sides of the lung-like plate sheet; fluid inlet and outlet holes A are formed in the lung-shaped imitating plate, the four fluid inlet and outlet holes A are symmetrically distributed in the four corners of the lung-shaped imitating plate, protruding plate pieces are arranged at the positions of the two longitudinally-formed fluid inlet and outlet holes A, the protruding plate pieces slightly protrude out of the lung-shaped imitating plate, and the protruding plate pieces are arranged on the front face or the back face of the lung-shaped imitating plate; a plate heat exchanger unit is formed by three imitated lung-shaped plates, and the imitated lung structure type plate heat exchanger is formed by a plurality of plate heat exchanger units. According to the lung-like structure, the heat transfer area is increased, the heat exchange efficiency is improved, and meanwhile the flow resistance is reduced.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology, and in particular to a plate with a lung-shaped structure and a plate heat exchanger. Background Technology

[0002] Heat exchangers are made up of layers of corrugated metal sheets with specific shapes. These sheets are stacked to form diverse channel structures, which enable the fluid between the sheets to exchange heat efficiently. Due to their advantages such as high heat exchange efficiency and compact structure, they are currently widely used in industries such as petrochemicals, aerospace, and food processing.

[0003] With increasing demands for higher heat transfer performance from heat exchangers, their heat exchange efficiency still needs improvement. Currently, the waveforms of widely used heat exchangers are mainly divided into two categories: herringbone waveforms and dotted waveforms. While existing herringbone-shaped plate heat exchangers have relatively low manufacturing costs and simple production processes, their performance is difficult to significantly improve when facing requirements for higher efficiency, energy saving, and higher precision. Existing dotted waveform plate heat exchangers require improvements in both heat transfer and resistance performance. Furthermore, their complex manufacturing processes and high costs mean that the aforementioned dotted waveform plate heat exchangers are no longer sufficient to meet current needs.

[0004] Therefore, given the shortcomings of existing technologies, how to overcome the performance limitations of traditional plate heat exchange equipment while achieving higher heat transfer performance and lower resistance performance is a question that needs to be considered. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a plate and plate heat exchanger with a lung-shaped structure. The lung-shaped structure of this invention increases the heat transfer area, improves heat exchange efficiency, and also reduces flow resistance.

[0006] The present invention achieves the above-mentioned technical objectives through the following technical means.

[0007] A plate with a lung-shaped structure includes a lung-shaped plate with a lung-shaped structure. The lung-shaped plate has an array of flow-dispersing columns on both its front and back sides, arranged along both longitudinal sides. The lung-shaped plate has four fluid inlet / outlet holes A, symmetrically distributed at the four corners. Two of the longitudinally arranged fluid inlet / outlet holes A have protruding plates that slightly protrude from the lung-shaped plate and are located on either the front or back side of the lung-shaped plate.

[0008] In the above scheme, there are two lung-shaped structures, symmetrically distributed on the lung-shaped plate, and the trachea in the lung-shaped structure is close to the protruding plate.

[0009] In the above scheme, the turbulence column is a semi-cylindrical structure, and the height of the turbulence column is flush with the height of the protruding plate.

[0010] In the above scheme, there are two sets of turbulence columns, and the tilt direction of the two sets of turbulence columns is opposite to the direction of the trachea of ​​the corresponding lung-shaped structure.

[0011] In the above scheme, the tilt angle of the turbulence column is arranged in the range of 10 to 90 degrees.

[0012] In the above scheme, the protruding plate is used to guide the fluid flowing out of the fluid inlet / outlet hole A.

[0013] In the above scheme, the lung-shaped structure includes a trachea and five-level bronchi, wherein the five-level bronchi include the main bronchus, lobar bronchus, segmental bronchus, subsegmental bronchus and small bronchus.

[0014] In the above scheme, the model of the five-level branch pipe is a hierarchical structure defined based on core geometric parameters, with a total number of levels of n, where the value of n ranges from 1 to 5. The key parameters in the model are defined by the following mathematical relationships:

[0015] S1, the total number of branches at level i, N i From formula {N i =N0×k(i) (0≤i≤2), N i =N2×k(i)^(i-2)(i≥3)} is calculated, where N0 is the baseline number of the 0th level trachea, N0=1, k(i) is the branch ratio function, used to define the branching rule of the i-th level, where k(1)=2, k(2)=5, and for all i≥3, k(i)=2;

[0016] S2. The length Li of the i-th bronchus is calculated by the formula Li=L0×m^i, where L0 is the initial length of the 0-th bronchus, L0=120mm, and m is the length attenuation coefficient, which ranges from 0.3 to 0.5.

[0017] S3, the diameter D of the i-th bronchus. i From formula D i = D0×n^i is calculated, where D0 is the initial diameter of the 0th-level trachea, D0=18mm, and n is the diameter attenuation rate coefficient, which ranges from 0.6 to 0.8.

[0018] The trachea is 10-15 mm long, and the top of the trachea and the bottom of the small bronchi are both dome-shaped.

[0019] A plate heat exchanger with a lung-like structure is fabricated using lung-shaped plates.

[0020] In the above scheme, three lung-shaped plates form a plate heat exchanger unit, and several plate heat exchanger units form a lung-shaped plate heat exchanger; the front of the first lung-shaped plate is attached to the back of the second lung-shaped plate, and the back of the first lung-shaped plate is attached to the front of the third lung-shaped plate; depending on the temperature of the fluid, a cold fluid channel or a hot fluid channel is formed between two adjacent lung-shaped plates; to prevent leakage, a sealing ring is provided at the joint between two adjacent lung-shaped plates.

[0021] Beneficial effects:

[0022] 1. This invention uses a centrally symmetrical concave design, which allows the entire heat exchanger core to be stacked using only one type of plate, effectively shortening the mold development and processing cycle of the plates and helping to reduce costs and increase efficiency.

[0023] 2. This invention proposes a novel plate heat exchange device that uses a lung-shaped structure to replace the traditional structure. The surface of the lung-shaped plates is embossed with a three-dimensional lung-like pattern to increase the heat transfer area and enhance fluid turbulence. By adopting the novel plate heat exchange device proposed in this invention, not only are the performance of traditional plate heat exchange devices improved, resulting in higher heat transfer performance and less resistance loss, but also the goals of higher efficiency, energy saving, and environmental protection and emission reduction are achieved.

[0024] 3. In this invention, the raised plate is slightly higher than the lung-shaped plate, and the raised plate and the turbulence column are at the same height, thereby forming a cold fluid channel or a hot fluid channel between two adjacent lung-shaped plates. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a plate with a lung-shaped structure according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the stacking sequence of the lung-shaped plates of the present invention;

[0028] Figure 4 This is a three-dimensional schematic diagram of the stacked lung-shaped plates of the present invention;

[0029] Figure 5 This is a top view schematic diagram of the lung-shaped plate structure of the present invention;

[0030] Figure 6 This is a cross-sectional view of the lung-shaped plate aa of the present invention;

[0031] Figure 7 This is a cross-sectional view of the lung-shaped plate of the present invention.

[0032] Figure 8 This is a cross-sectional view (cc) of the lung-shaped plate of the present invention;

[0033] Figure 9 This is a side view schematic diagram of the lung-shaped plate structure of the present invention;

[0034] Figure 10 This is a schematic diagram of the lung-like bronchus mold for denting according to the present invention;

[0035] Figure 11 This is a schematic diagram showing the cut-off height range of the simulated lung bronchus mold for indentation according to the present invention.

[0036] Figure 12 This is a graph showing the relationship between the overall performance (TP) value of the lung-shaped plate heat exchanger of the present invention and that of a traditional plate heat exchanger, and the flow rate.

[0037] Figure label:

[0038] A. Fluid inlet / outlet; B. Flow guiding zone; C. Heat exchange zone; 1-Cold fluid channel; 2-Hot fluid channel; 3-Raised plate; 4-Lung-shaped structure; 5-Break column; 6-Lung-shaped bronchus; 9-Lung-shaped plate; 10-Sealing ring. Detailed Implementation

[0039] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0040] A plate with a lung-shaped structure includes a lung-shaped plate 9, on which a lung-shaped structure 4 is provided; an array of baffle columns 5 are provided on both the front and back sides of the lung-shaped plate 9, and the array of baffle columns 5 are arranged along both sides of the longitudinal direction of the lung-shaped plate 9; the lung-shaped plate 9 is provided with fluid inlet and outlet holes A, there are four fluid inlet and outlet holes A, which are symmetrically distributed at the four corners of the lung-shaped plate 9, wherein a protruding plate 3 is provided at two of the longitudinally arranged fluid inlet and outlet holes A, the protruding plate 3 slightly protruding from the lung-shaped plate 9, and the protruding plate 3 is provided on the front or back side of the lung-shaped plate 9.

[0041] There are two lung-shaped structures 4, symmetrically distributed on the lung-shaped plate 9, and the trachea in the lung-shaped structure 4 is close to the protruding plate 3.

[0042] The turbulence column 5 is a semi-cylindrical structure, and the height of the turbulence column 5 is flush with the height of the protruding plate 3.

[0043] There are two sets of the turbulence columns 5, and the angle of inclination of the two sets of turbulence columns 5 is opposite to the direction of the trachea of ​​the corresponding lung-shaped structure 4.

[0044] The turbulence-disrupting columns 5 are arranged with an inclination angle of 10~90°.

[0045] The raised plate 3 is used to guide the fluid flowing out of the fluid inlet / outlet hole A.

[0046] The lung-shaped structure 4 includes a trachea and five-level bronchi, wherein the five-level bronchi include the main bronchus, lobar bronchus, segmental bronchus, subsegmental bronchus and small bronchus.

[0047] The five-level branch pipe model is a hierarchical structure based on core geometric parameters, with a total number of levels n, where n ranges from 1 to 5. The key parameters in the model are defined by the following mathematical relationships:

[0048] S1, the total number of branches at level i, N i From formula {N i =N0×k(i) (0≤i≤2), N i =N2×k(i)^(i-2)(i≥3)} is calculated, where N0 is the baseline number of the 0th level trachea, N0=1, k(i) is the branch ratio function, used to define the branching rule of the i-th level, where k(1)=2, k(2)=5, and for all i≥3, k(i)=2;

[0049] S2, the length L of the i-th bronchus i From formula L i =L0×m^i is calculated, where L0 is the initial length of the 0th stage trachea, L0=120mm, and m is the length attenuation rate coefficient, the value of which is between 0.3 and 0.5.

[0050] S3, the diameter D of the i-th bronchus. i From formula D i = D0×n^i is calculated, where D0 is the initial diameter of the 0th-level trachea, D0=18mm, and n is the diameter attenuation rate coefficient, which ranges from 0.6 to 0.8.

[0051] A plate heat exchanger with a lung-like structure is fabricated using lung-shaped plates.

[0052] Three lung-shaped plates 9 form a plate heat exchanger unit, and several plate heat exchanger units form a lung-shaped plate heat exchanger. The front of the first lung-shaped plate is attached to the back of the second lung-shaped plate, and the back of the first lung-shaped plate is attached to the front of the third lung-shaped plate. Depending on the temperature of the fluid, a cold fluid channel 1 or a hot fluid channel 2 is formed between two adjacent lung-shaped plates. To prevent leakage, a sealing ring 10 is provided at the joint between two adjacent lung-shaped plates 9.

[0053] Combined with appendix Figure 1-2 In one embodiment of this application, a plate heat exchanger with a lung-shaped concave-convex structure includes a fluid inlet / outlet port A, a flow guiding zone B, and a heat exchange zone C. The fluid inlet / outlet port A is located at both ends of the lung-shaped plate 9. Fluid flows into the lung-shaped plate 9 through the fluid inlet / outlet port A via an external pipe. The two sets of fluid inlet / outlet ports A are used to connect a cold fluid channel 1 and a hot fluid channel 2, respectively. The flow guiding zone B is provided with protruding plates 3 at a certain angle. The height of the protruding plates 3 is the same as the height of the cold fluid channel 1 and the hot fluid channel 2 formed between the two lung-shaped plates 9. The protruding plates are used to block the fluid in the channel between the two lung-shaped plates from flowing to the adjacent channel while guiding the fluid to flow to the heat exchange zone C. The heat exchange zone C is located in the middle of the lung-shaped plate 9. The heat exchange zone C includes a lung-shaped structure 4. Several semi-cylindrical concave-convex structure turbulence columns 5 are arranged in the blank areas of the lung-shaped plate 9 to enhance fluid flow mixing.

[0054] Combined with appendix Figure 3-9 The heat exchange zone C includes a lung-shaped structure 4, which is formed by indenting two simplified sets of bronchial segments onto a lung-shaped plate 9. The two sets of lung-shaped structures 4 are symmetrically distributed along the y-axis, increasing the heat exchange area while enhancing disturbance, thereby improving heat exchange efficiency. (See attached diagram.) Figure 6-9 The fluid inlet / outlet A is connected to the pipe. The height of the fluid inlet / outlet A is flush with the height of the lung-shaped plate 9. The part protruding from the lung-shaped plate 9 is the pipe.

[0055] The semi-cylindrical concave-convex structure of the turbulence column 5 is located on both sides of the lung-shaped plate 9, symmetrically distributed along the x-axis and y-axis, and the angle relative to the fluid flow direction is selected between 10-90°, which is beneficial to increase the heat exchange area, improve the flow, and thus enhance the heat transfer.

[0056] Combined with appendix Figure 10-11 The simulated lung trachea 6 includes the trachea 7 and the first five branch tubes. The cut height of the simulated lung bronchus mold is part of the height of the simulated lung bronchus mold. The cut height is generally selected and set in the range of 0.6-0.8mm to ensure the uniformity of heat exchange of the heat exchange medium. The simulated lung bronchus mold is used to obtain the simulated lung-shaped structure 4.

[0057] More specifically, this application simplifies the trachea and bronchus. The model is based on the actual bronchus and only simplifies the trachea 7 and the first five branches. The first five branches, in order of size, include the main bronchus, lobar bronchus, segmental bronchus, subsegmental bronchus and small bronchus 8. Since this invention focuses on larger structures, small-sized bronchi are not included in the scope of study.

[0058] More specifically, this application simplifies the trachea and the first five branch pipes, wherein the length of trachea 7 is shortened to 10-15mm to concentrate the heat exchange area.

[0059] More specifically, this application simplifies the trachea and the first five branch tubes, wherein the top of the trachea 7 and the bottom of the small bronchus 8 are provided with domes to reduce the resistance when the medium flows through the boundary of the indentation structure, so as to make the fluid velocity distribution more uniform and thus effectively reduce pressure loss.

[0060] More specifically, this application simplifies the trachea and the first five branch tubes, wherein the bifurcation angle of the branch tubes is set to 60-120°.

[0061] More specifically, in practical implementation, the proportion of the plate occupied by the concave structure can be adjusted proportionally according to actual engineering needs. The simplified first five-level branch pipe model is a hierarchical structure defined based on core geometric parameters, with a total number of levels of n. The key parameters in the model are defined by the following mathematical relationships:

[0062] S1, the total number of branches at level i, N i From formula {N i =N0×k(i) (0≤i≤2), N i =N2×k(i)^(i-2)(i≥3)} is calculated, where N0 is the baseline number of the 0th level trachea, N0=1, k(i) is the branch ratio function, used to define the branching rule of the i-th level, where k(1)=2 indicates that the main trachea first branches into the left and right main bronchi, k(2)=5 indicates that the left main bronchi branches into 2 lobe bronchi and the right main bronchi branches into 3 lobe bronchi, the total number of branches in this level is 5, for all i≥3, k(i)=2 indicates that the branches of all subsequent levels follow the standard bisection rule;

[0063] S2, the length Li of the i-th bronchus is given by formula L i =L0×m^i is calculated, where L0 is the initial length of the 0th stage trachea, L0=120mm, and m is the length attenuation rate coefficient, the value of which is between 0.3 and 0.5.

[0064] S3, the diameter D of the i-th bronchus. i From formula D i= D0×n^i is calculated, where D0 is the initial diameter of the 0th-level trachea, D0=18mm, and n is the diameter attenuation rate coefficient, the value of which is between 0.6 and 0.8.

[0065] The total number of levels n ranges from 1 to 5, and the initial length L0 and initial diameter D0 of the 0th level trachea are set based on the physiological data of the target object or a standard human body model.

[0066] When using this application, please refer to the specific instructions. Figure 3 The heat exchanger comprises three lung-shaped plates 9. The second and third lung-shaped plates are flipped 180 degrees and then stacked with the first lung-shaped plate to form the core heat exchanger element of the heat exchange device. Specifically, the three lung-shaped plates 9 form a plate heat exchanger unit. The front of the first lung-shaped plate is fitted with the back of the second lung-shaped plate, and the back of the first lung-shaped plate is fitted with the front of the third lung-shaped plate. Depending on the fluid temperature, a cold fluid channel 1 or a hot fluid channel 2 is formed between adjacent lung-shaped plates. To prevent leakage, a sealing ring 10 is provided at the joint between adjacent lung-shaped plates 9. The sealing ring serves to seal and prevent leakage.

[0067] To verify the comprehensive performance advantages of the novel plate heat exchanger of this invention, a set of comparative experimental data based on CFD simulation is provided below. This experiment uses the lung-shaped plate heat exchanger described in Embodiment 1 of this invention as the experimental group, and a traditional herringbone plate heat exchanger with the same external dimensions and basic plate shape as the control group. The simulation was conducted under the same heat exchange conditions, with a cold fluid inlet temperature of 20℃ and a hot fluid inlet temperature of 90℃. The fluid inlet velocities were controlled at 0.50 m / s, 0.60 m / s, 0.70 m / s, and 0.80 m / s, respectively. Considering the influence of heat transfer and resistance of the plate heat exchanger, the comprehensive performance evaluation index TP was used as the core comparative parameter, defined as TP = Nu / f. 1 / 3 Where Nu is the Nusselt number and f is the friction factor, the simulation results of the experimental group and the control group are summarized in the table and figure below.

[0068] Table 1: Comparison of simulation performance between the experimental group and the control group at different flow rates

[0069] Contrast Model Flow velocity (m / s) Cold fluid outlet temperature (°C) Nu f TP TP increase ratio experimental group 0.50 65.67 4778.89 5.92 2641.53 15.61% control group 37.39 4701.25 8.71 2284.77 experimental group 0.60 63.12 5373.02 7.43 2753.49 21.95% control group 35.61 5089.46 11.45 2257.82 experimental group 0.70 61.01 5992.51 9.02 2878.53 28.31% control group 34.19 5344.70 13.52 2243.39 experimental group 0.80 59.25 6577.20 10.71 2983.73 35.31% control group 33.04 5562.19 16.05 2205.04

[0070] As the simulation results show, within the flow velocity range covered by this invention, the TP value of the experimental group is always significantly higher than that of the control group, effectively achieving the technical effect of synergistically enhancing heat transfer and optimizing flow resistance, demonstrating the progressiveness and practicality of this invention.

[0071] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A plate with a lung-shaped structure, characterized in that, The device includes a lung-shaped plate (9), on which a lung-shaped structure (4) is provided; arrays of turbulence-disrupting columns (5) are provided on both the front and back sides of the lung-shaped plate (9), and the arrays of turbulence-disrupting columns (5) are provided on both sides of the lung-shaped plate (9) in the longitudinal direction; fluid inlet and outlet holes A are provided on the lung-shaped plate (9), and there are four fluid inlet and outlet holes A, which are symmetrically distributed at the four corners of the lung-shaped plate (9). Among them, two of the longitudinally arranged fluid inlet and outlet holes A are provided with protruding plates (3), which protrude slightly from the lung-shaped plate (9). The protruding plates (3) are provided on the front or back sides of the lung-shaped plate (9).

2. The plate with a lung-shaped structure according to claim 1, characterized in that, There are two lung-shaped structures (4), which are symmetrically distributed on the lung-shaped plate (9). The trachea in the lung-shaped structure (4) is close to the protruding plate (3).

3. The plate with a lung-shaped structure according to claim 1, characterized in that, The turbulence column (5) is a semi-cylindrical structure, and the height of the turbulence column (5) is flush with the height of the protruding plate (3).

4. The plate with a lung-shaped structure according to claim 1, characterized in that, There are two sets of the turbulence columns (5), and the angle of the two sets of turbulence columns (5) is opposite to the direction of the trachea of ​​the corresponding lung-shaped structure (4).

5. The plate with a lung-shaped structure according to claim 4, characterized in that, The turbulence-disrupting columns (5) are arranged with an inclination angle of 10~90°.

6. The plate with a lung-shaped structure according to claim 1, characterized in that, The raised plate (3) is used to guide the fluid flowing out of the fluid inlet / outlet hole A.

7. The plate with a lung-shaped structure according to claim 1, characterized in that, The lung-like structure (4) includes a trachea and five-level bronchi, wherein the five-level bronchi include the main bronchus, lobar bronchus, segmental bronchus, subsegmental bronchus, and small bronchus; the model of the five-level branching tubes is a hierarchical structure defined based on core geometric parameters, with a total number of levels n, where n ranges from 1 to 5, and the key parameters in the model are defined by the following mathematical relationships: S1, the total number of branches at level i, N i From formula {N i =N0×k(i) (0≤i≤2), N i =N2×k(i)^(i-2)(i≥3)} is calculated, where N0 is the baseline number of the 0th level trachea, N0=1, k(i) is the branch ratio function, used to define the branching rule of the i-th level, where k(1)=2, k(2)=5, and for all i≥3, k(i)=2; S2, the length L of the i-th bronchus i From formula L i =L0×m^i is calculated, where L0 is the initial length of the 0th stage trachea, L0=120mm, and m is the length attenuation rate coefficient, the value of which is between 0.3 and 0.

5. S3, the diameter D of the i-th bronchus. i From formula D i = D0×n^i is calculated, where D0 is the initial diameter of the 0th-level trachea, D0=18mm, and n is the diameter attenuation rate coefficient, which ranges from 0.6 to 0.

8.

8. The plate with a lung-shaped structure according to claim 7, characterized in that, The trachea is 10-15 mm long, and the top of the trachea and the bottom of the small bronchi are both dome-shaped.

9. A plate heat exchanger with a lung-like structure, characterized in that, Prepared using the lung-shaped plate (9) protected by any one of claims 1-8.

10. The plate heat exchanger with a lung-like structure according to claim 9, characterized in that, Three of the aforementioned lung-shaped plates (9) form a plate heat exchanger unit, and several plate heat exchanger units form a lung-shaped plate heat exchanger; the front of the first lung-shaped plate is attached to the back of the second lung-shaped plate, and the back of the first lung-shaped plate is attached to the front of the third lung-shaped plate; depending on the temperature of the fluid, a cold fluid channel (1) or a hot fluid channel (2) is formed between two adjacent lung-shaped plates; in order to prevent leakage, a sealing ring (10) is provided at the joint between two adjacent lung-shaped plates (9).

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