Separation and storage integrated liquid separation condensation double-pipe heat exchanger

Abstract

The utility model discloses a separate storage integrated liquid separation condensation double-pipe heat exchanger which comprises a first-stage liquid separation condensation mechanism, a second-stage liquid separation condensation mechanism and a third-stage liquid separation condensation mechanism which are sequentially connected in series. The first-stage liquid separation and condensation mechanism comprises a first sleeve condenser and a first separation and storage integrated tank; the second-stage liquid separation and condensation mechanism comprises a second sleeve condenser and a second separation and storage integrated tank; the third-stage liquid separation and condensation mechanism comprises a third sleeve condenser and a third separation and storage integrated tank; liquid refrigerant outlets of the first separate storage integrated tank, the second separate storage integrated tank and the third separate storage integrated tank are all communicated with a liquid collecting assembly; a gaseous refrigerant outlet of the first separate storage integrated tank is communicated with a refrigerant inlet of the second sleeve condenser, and a gaseous refrigerant outlet of the second separate storage integrated tank is communicated with a refrigerant inlet of the third sleeve condenser. According to the utility model, the equivalent liquid separation and condensation effect is realized, the heat transfer is obviously enhanced, and the design and manufacturing difficulty of the liquid separation and condensation heat exchanger in the aspects of gas-liquid separation and flow distribution is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat transfer enhancement, in particular to a split storage integrated liquid separation and condensation sleeve heat exchanger. Background Technique

[0002] Azeotropic refrigerants have the characteristic of temperature glide, which can match the temperature of the heat source / heat sink, reducing the irreversible heat transfer loss of the heat exchanger. However, the heat transfer coefficient of azeotropic refrigerants is lower than that of pure refrigerants. To improve the heat transfer coefficient of azeotropic refrigerants, methods such as adding fins, microchannels, and threads to the inner wall of the tube are usually adopted. Although these methods can enhance turbulence and increase the heat transfer area, they also bring the problem of increased pressure drop. During the condensation process, the heat transfer coefficient gradually decreases with the decrease of the dryness. The reason is that the condensed liquid gradually accumulates, resulting in an increase in the liquid film thickness, and the condensation flow pattern changes from annular flow to intermittent flow, and the liquid film hinders the contact between the vapor and the wall. The liquid separation and condensation technology is a new condensation heat transfer enhancement technology. By separating the gas-liquid during the condensation process, the dryness of the subsequent condensed vapor is increased, thereby effectively increasing the condensation heat transfer coefficient and reducing the flow resistance.

[0003] The existing technology has the following main defects: (1) Azeotropic refrigerants have the advantage of temperature glide, which can reduce the irreversible heat transfer loss between the refrigerant and the heat source / heat sink and are widely used in the fields of organic Rankine cycle and heat pump. However, the heat transfer coefficient of azeotropic refrigerants is lower than that of pure refrigerants, resulting in an increase in the heat transfer area and an increase in the investment cost. (2) The liquid separation and condensation technology can separate the condensed liquid from the gas-liquid two-phase flow during the condensation process, reduce the liquid film thickness on the cooling surface, and increase the dryness of the refrigerant. The good heat transfer characteristics in the high-dryness region are used to improve the overall heat transfer performance. However, when the existing liquid separation and condensation technology is used to improve the traditional shell-and-tube heat exchanger or plate heat exchanger, problems such as insufficient gas-liquid separation and complex design of flow redistribution often occur. (3) The sleeve heat exchanger has a simple structure and high heat transfer efficiency, but most of the middle part of the sleeve heat exchanger is hollow, resulting in insufficient area utilization.

[0004] Therefore, a split storage integrated liquid separation and condensation sleeve heat exchanger is proposed. Content of the Utility Model

[0005] The purpose of the utility model is to provide a split storage integrated liquid separation and condensation sleeve heat exchanger, aiming to solve or improve at least one of the above technical problems.

[0006] To achieve the above purpose, the utility model provides the following solution: The utility model provides a split storage integrated liquid separation and condensation sleeve heat exchanger, which includes a primary liquid separation and condensation mechanism, a secondary liquid separation and condensation mechanism, and a tertiary liquid separation and condensation mechanism connected in series in sequence;

[0007] The primary liquid separation and condensation mechanism includes a first shell-and-tube condenser and a first integrated separation and storage tank installed inside the first shell-and-tube condenser; the secondary liquid separation and condensation mechanism includes a second shell-and-tube condenser and a second integrated separation and storage tank installed inside the second shell-and-tube condenser; the tertiary liquid separation and condensation mechanism includes a third shell-and-tube condenser and a third integrated separation and storage tank installed inside the third shell-and-tube condenser;

[0008] Liquid refrigerant outlets of the first integrated separation and storage tank, the second integrated separation and storage tank, and the third integrated separation and storage tank are all connected to a liquid collection assembly;

[0009] The gaseous refrigerant outlet of the first integrated separation and storage tank is connected to the refrigerant inlet of the second shell-and-tube condenser, and the gaseous refrigerant outlet of the second integrated separation and storage tank is connected to the refrigerant inlet of the third shell-and-tube condenser;

[0010] Gas-liquid mixed refrigerant inlets of the first integrated separation and storage tank, the second integrated separation and storage tank, and the third integrated separation and storage tank are respectively connected to the refrigerant outlets of the first shell-and-tube condenser, the second shell-and-tube condenser, and the third shell-and-tube condenser.

[0011] According to the split storage and integrated liquid separation and condensation shell-and-tube heat exchanger provided by the present utility model, the liquid collection assembly includes a liquid collection pipe and two three-way valves; both of the two three-way valves are installed on the liquid collection pipe, and liquid refrigerant outlets of the first integrated separation and storage tank, the second integrated separation and storage tank, and the third integrated separation and storage tank are all connected to the liquid collection pipe;

[0012] The two three-way valves are respectively located between the first integrated separation and storage tank and the second integrated separation and storage tank, and between the second integrated separation and storage tank and the third integrated separation and storage tank.

[0013] According to the split storage and integrated liquid separation and condensation shell-and-tube heat exchanger provided by the present utility model, the heat transfer area of the first shell-and-tube condenser is larger than the heat transfer area of the second shell-and-tube condenser, and the heat transfer area of the second shell-and-tube condenser is larger than the heat transfer area of the third shell-and-tube condenser.

[0014] According to the split storage and integrated liquid separation and condensation shell-and-tube heat exchanger provided by the present utility model, the first shell-and-tube condenser, the second shell-and-tube condenser, and the third shell-and-tube condenser have the same structure;

[0015] The water inlet of the first shell-and-tube condenser is located on one side of the top, the refrigerant outlet of the first shell-and-tube condenser is arranged close to the water inlet, the water outlet of the first shell-and-tube condenser is located on one side of the bottom, and the refrigerant inlet of the first shell-and-tube condenser is arranged close to the water outlet.

[0016] According to the split storage integrated liquid separation and condensation sleeve heat exchanger provided by the present utility model, the first sleeve condenser is a spirally arranged sleeve, a sandwich layer is provided on the inner wall of the sleeve, the refrigerant outlet and the refrigerant inlet are both communicated with the inner cavity of the sleeve, and the water outlet and the water inlet are both communicated with the inner cavity of the sleeve.

[0017] According to the split storage integrated liquid separation and condensation sleeve heat exchanger provided by the present utility model, a flow sensor is installed on the liquid collecting pipe.

[0018] The present utility model discloses the following technical effects:

[0019] By installing a split storage integrated tank in the hollow part inside the sleeve condenser, the present utility model forms an overall liquid separation and condensation mechanism, strengthens the condensation heat transfer coefficient of the non-azeotropic working fluid in the condenser, improves the compactness of the sleeve heat exchanger, is conducive to realizing the liquid separation and condensation form, and improves the heat transfer efficiency; each split storage integrated tank and the sleeve heat exchanger form a module, which is easy to expand to form a multi-stage liquid separation and condensation heat exchanger;

[0020] The present utility model adopts a first-stage liquid separation and condensation mechanism, a second-stage liquid separation and condensation mechanism and a third-stage liquid separation and condensation mechanism connected in series in sequence, realizes an equivalent liquid separation and condensation effect, significantly strengthens heat transfer, and reduces the design and manufacturing difficulties of the liquid separation and condensation heat exchanger in terms of gas-liquid separation and flow distribution, which is conducive to the popularization of the liquid separation and condensation technology. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a structural schematic diagram of the present utility model;

[0023] Figure 2 It is a structural schematic diagram of the first sleeve condenser in the present utility model;

[0024] Figure 3 It is a structural schematic diagram of the first split storage integrated tank in the present utility model.

[0025] Among them, 1, the first sleeve condenser; 2, the first split storage integrated tank; 3, the second sleeve condenser; 4, the second split storage integrated tank; 5, the third sleeve condenser; 6, the third split storage integrated tank; 7, the gaseous refrigerant outlet; 8, the liquid refrigerant outlet; 9, the gas-liquid mixed refrigerant inlet; 10, the liquid collecting pipe; 11, the three-way valve; 12, the water inlet; 13, the water outlet. Detailed Embodiments

[0026] Next, in conjunction with the accompanying drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Referring to Figures 1 - 3 , the present utility model provides a separate storage integrated liquid separation and condensation sleeve heat exchanger, which includes a first-stage liquid separation and condensation mechanism, a second-stage liquid separation and condensation mechanism, and a third-stage liquid separation and condensation mechanism connected in series in sequence;

[0029] The first-stage liquid separation and condensation mechanism includes a first sleeve condenser 1 and a first separate storage integrated tank 2 installed inside the first sleeve condenser 1; the second-stage liquid separation and condensation mechanism includes a second sleeve condenser 3 and a second separate storage integrated tank 4 installed inside the second sleeve condenser 3; the third-stage liquid separation and condensation mechanism includes a third sleeve condenser 5 and a third separate storage integrated tank 6 installed inside the third sleeve condenser 5;

[0030] The liquid refrigerant outlets 8 of the first separate storage integrated tank 2, the second separate storage integrated tank 4, and the third separate storage integrated tank 6 are all connected to a liquid collection assembly; the first separate storage integrated tank 2, the second separate storage integrated tank 4, and the third separate storage integrated tank 6 have the functions of both gas-liquid separation and liquid storage;

[0031] The gaseous refrigerant outlet 7 of the first separate storage integrated tank 2 is connected to the refrigerant inlet of the second sleeve condenser 3, and the gaseous refrigerant outlet 7 of the second separate storage integrated tank 4 is connected to the refrigerant inlet of the third sleeve condenser 5;

[0032] The gas-liquid mixed refrigerant inlets 9 of the first separate storage integrated tank 2, the second separate storage integrated tank 4, and the third separate storage integrated tank 6 are respectively connected to the refrigerant outlets of the first sleeve condenser 1, the second sleeve condenser 3, and the third sleeve condenser 5;

[0033] Among the refrigerant outlets of the first sleeve condenser 1, the condensed gas-liquid two-phase mixture refrigerant flows into the first separate storage integrated tank 2, and the gaseous refrigerant and the liquid refrigerant are separated. The gaseous refrigerant flows into the second sleeve condenser 3, and the liquid refrigerant enters the liquid collection pipe 10 of the liquid collection assembly; similarly, the gaseous refrigerant of the second separate storage integrated tank 4 enters the third sleeve condenser 5, is completely condensed and then enters the liquid collection pipe 10, and the subcooled refrigerant flows out from the third sleeve condenser 5;

[0034] With such a setting, in the present utility model, a liquid separation and storage integrated tank is installed in the hollow part inside the casing condenser, forming an integral liquid separation and condensation mechanism, strengthening the condensation heat transfer coefficient of the non-azeotropic working fluid in the condenser, improving the compactness of the casing heat exchanger, and facilitating the realization of the liquid separation and condensation form to improve the heat transfer efficiency; each liquid separation and storage integrated tank and the casing heat exchanger form a module, which is easy to expand to form a multi-stage liquid separation and condensation heat exchanger.

[0035] The present utility model adopts a first-stage liquid separation and condensation mechanism, a second-stage liquid separation and condensation mechanism, and a third-stage liquid separation and condensation mechanism connected in series in sequence, achieving an equivalent liquid separation and condensation effect, significantly strengthening heat transfer, and reducing the design and manufacturing difficulties of the liquid separation and condensation heat exchanger in terms of gas-liquid separation and flow distribution, which is conducive to the popularization of the liquid separation and condensation technology.

[0036] In a further optimized solution, the liquid collection assembly includes a liquid collection pipe 10 and two three-way valves 11; both of the two three-way valves 11 are installed on the liquid collection pipe 10, and the liquid refrigerant outlets 8 of the first liquid separation and storage integrated tank 2, the second liquid separation and storage integrated tank 4, and the third liquid separation and storage integrated tank 6 are all communicated with the liquid collection pipe 10.

[0037] The two three-way valves 11 are respectively located between the first liquid separation and storage integrated tank 2 and the second liquid separation and storage integrated tank 4, and between the second liquid separation and storage integrated tank 4 and the third liquid separation and storage integrated tank 6.

[0038] With such a setting, by adding a three-way valve 11 to the liquid collection pipe 10 of each stage of the liquid separation and condensation heat exchanger, a part of the liquid can be separated and then enter other heat exchangers, such as an economizer; thereby changing the concentration of the non-azeotropic liquid working fluid at the outlet of the terminal liquid separation and condensation heat exchanger, and thus realizing active concentration regulation to improve the thermodynamic performance of the organic Rankine cycle or heat pump.

[0039] The separation and convergence of the liquid refrigerant can be controlled by the three-way valve 11. Since the concentration of the non-azeotropic working fluid will change, different components of the liquid-phase working fluid can be obtained through the separation and convergence method, realizing the active regulation of the concentration of the mixed working fluid, and improving the thermodynamic performance and off-design performance of the cycle system.

[0040] In a further optimized solution, the heat transfer area of the first casing condenser 1 is larger than that of the second casing condenser 3, and the heat transfer area of the second casing condenser 3 is larger than that of the third casing condenser 5.

[0041] Since the refrigerant flow rate in each stage of the condenser gradually decreases after the liquid is separated, the required area of the casing heat exchanger also decreases accordingly, and the increase and decrease of the heat transfer area of the casing heat exchanger are convenient for adjustment.

[0042] In a further optimized solution, the structures of the first casing condenser 1, the second casing condenser 3, and the third casing condenser 5 are the same.

[0043] The water inlet 12 of the first shell-and-tube condenser 1 is located on one side at the top. The refrigerant outlet of the first shell-and-tube condenser 1 is arranged close to the water inlet 12. The water outlet 13 of the first shell-and-tube condenser 1 is located on one side at the bottom. The refrigerant inlet of the first shell-and-tube condenser 1 is arranged close to the water outlet 13.

[0044] In a further optimized solution, the first shell-and-tube condenser 1 is a spirally arranged shell-and-tube. There is an interlayer on the inner wall of the shell-and-tube. Both the refrigerant outlet and the refrigerant inlet communicate with the inner cavity of the shell-and-tube. Both the water outlet 13 and the water inlet 12 communicate with the inner cavity of the sleeve. The first shell-and-tube condenser 1, the second shell-and-tube condenser 3, and the third shell-and-tube condenser 5 all adopt spiral tubes to enhance heat transfer.

[0045] In a further optimized solution, a flow sensor (not shown in the figure) is installed on the liquid collecting pipe 10 to monitor the flow rate in the liquid collecting pipe 10.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0047] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. The integrated liquid separation and condensation shell and tube heat exchanger is characterized by: It comprises a first-stage liquid separation and condensation mechanism, a second-stage liquid separation and condensation mechanism and a third-stage liquid separation and condensation mechanism which are connected in series in sequence; The first-stage liquid separation and condensation mechanism comprises a first jacketed tube condenser (1) and a first integrated storage tank (2) installed inside the first jacketed tube condenser (1); the second-stage liquid separation and condensation mechanism comprises a second jacketed tube condenser (3) and a second integrated storage tank (4) installed inside the second jacketed tube condenser (3); the third-stage liquid separation and condensation mechanism comprises a third jacketed tube condenser (5) and a third integrated storage tank (6) installed inside the third jacketed tube condenser (5); The liquid refrigerant outlets (8) of the first integrated sub-storage tank (2), the second integrated sub-storage tank (4) and the third integrated sub-storage tank (6) are all connected to a liquid collecting assembly; The gaseous refrigerant outlet (7) of the first integrated storage tank (2) is in communication with the refrigerant inlet of the second double-tube condenser (3), and the gaseous refrigerant outlet (7) of the second integrated storage tank (4) is in communication with the refrigerant inlet of the third double-tube condenser (5); The gas-liquid mixed refrigerant inlets (9) of the first integrated sub-storage tank (2), the second integrated sub-storage tank (4) and the third integrated sub-storage tank (6) are respectively connected to the refrigerant outlets of the first double-tube condenser (1), the second double-tube condenser (3) and the third double-tube condenser (5).

2. The integrated liquid separation and condensation shell and tube heat exchanger with separate storage according to claim 1 is characterized in that: The liquid collecting assembly comprises a liquid collecting pipe (10) and two three-way valves (11); the two three-way valves (11) are both mounted on the liquid collecting pipe (10); the liquid refrigerant outlets (8) of the first integrated sub-storage tank (2), the second integrated sub-storage tank (4) and the third integrated sub-storage tank (6) are all in communication with the liquid collecting pipe (10); The two three-way valves (11) are respectively located between the first integrated storage tank (2) and the second integrated storage tank (4), and between the second integrated storage tank (4) and the third integrated storage tank (6).

3. The integrated liquid separation and condensation shell and tube heat exchanger with separate storage according to claim 1 is characterized in that: The heat transfer area of ​​the first double-tube condenser (1) is greater than the heat transfer area of ​​the second double-tube condenser (3), and the heat transfer area of ​​the second double-tube condenser (3) is greater than the heat transfer area of ​​the third double-tube condenser (5).

4. The integrated liquid separation and condensation shell and tube heat exchanger with separate storage according to claim 1 is characterized in that: The first double-tube condenser (1), the second double-tube condenser (3) and the third double-tube condenser (5) have the same structure; The water inlet (12) of the first shell and tube condenser (1) is located on the top side, and the refrigerant outlet of the first shell and tube condenser (1) is arranged close to the water inlet (12); the water outlet (13) of the first shell and tube condenser (1) is located on the bottom side, and the refrigerant inlet of the first shell and tube condenser (1) is arranged close to the water outlet (13).

5. The integrated liquid separation and condensation shell and tube heat exchanger with separate storage according to claim 4 is characterized in that: The first shell and tube condenser (1) is a spirally arranged shell, the inner wall of the shell is provided with an interlayer, the refrigerant outlet and the refrigerant inlet are both connected to the inner cavity of the shell, and the water outlet (13) and the water inlet (12) are both connected to the inner cavity of the shell.

6. The integrated liquid separation and condensation shell and tube heat exchanger according to claim 2 is characterized in that: A flow sensor is installed on the liquid collecting pipe (10).

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