Heat accumulating type shell-and-tube heat exchange device for preparing steam

Abstract

The utility model discloses a heat accumulating type tube shell heat exchange device for preparing steam, which comprises a heat exchange tube box component and a heat insulation box component, and the heat insulation box component is wrapped outside the heat exchange tube box component. The heat exchange tube box assembly comprises a first heat exchange box body and a plurality of heat exchange tubes, the middle of the first heat exchange box body is a closed first heat exchange space, and the heat exchange tubes are connected into the first heat exchange space in the first heat exchange box body. A first working medium inlet and a first working medium outlet which form a flow channel with the heat exchange tube are respectively formed in two ends of the first heat exchange box body; the heat preservation box assembly comprises a heat preservation box body, a heat preservation pipe, a communicating pipe and an outflow pipe, the middle of the heat preservation box body and the first heat exchange box body form a second heat exchange space, and the second heat exchange space is filled with a phase change material. The heat exchanger has the advantages that heat stored by the phase-change materials is utilized, and heat exchange efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of steam heat pumps, in particular to a shell and tube type heat exchange device. Background Art

[0002] The shell and tube heat exchanger consists of a shell, a heat transfer tube bundle, a tube sheet, a baffle (baffle), and a tube box. The shell is mostly cylindrical, with a tube bundle inside, and both ends of the tube bundle are fixed on the tube sheet. The two hot and cold fluids for heat exchange, one flows in the tube, called the tube-side fluid; the other flows outside the tube, called the shell-side fluid. In order to improve the heat transfer coefficient of the fluid outside the tube, several baffles are usually installed in the shell. The baffle can increase the shell-side fluid velocity, forcing the fluid to pass through the tube bundle horizontally for multiple times according to the prescribed distance, and enhancing the turbulence of the fluid. The heat exchange tubes can be arranged in an equilateral triangle or square on the tube sheet. The equilateral triangle arrangement is more compact, the turbulence of the fluid outside the tube is high, and the heat transfer coefficient is large; the square arrangement is convenient for cleaning the outside of the tube, which is suitable for fluids that are prone to scaling.

[0003] In order to improve the heat transfer efficiency of traditional shell and tube heat exchangers, the existing technical means include adding baffles to the shell side, using internal and external finned tubes, winding tubes, and setting interlayers to reduce heat dissipation, such as CN103017574A-a shell and tube heat exchanger with serpentine heat exchange tubes, which improves the heat transfer efficiency by setting up an increase in the heat exchange process. However, traditional shell and tube heat exchangers are not insulated, and a large amount of heat dissipates through the shell during the heat exchange process. The heat transfer effect caused by the large amount of heat dissipation is not ideal, and the heat transfer coefficient is low. Most of the current technical means are aimed at the problem of low heat transfer coefficient, and only a few are aimed at the large heat dissipation of the shell, so there is still room for improvement.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the utility model, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to ordinary technicians in this field. Utility Model Content

[0005] The technical problem to be solved by the utility model is: how to solve the problem that the current shell and tube heat exchange device has no insulation design, resulting in a large amount of heat dissipation during the heat exchange process, resulting in unsatisfactory heat exchange effect.

[0006] The utility model solves the above technical problems through the following technical means:

[0007] A heat storage tube shell heat exchange device for producing steam, comprising a heat exchange tube box assembly and a heat preservation box assembly, wherein the heat preservation box assembly is wrapped around the outside of the heat exchange tube box assembly;

[0008] The heat exchange tube box assembly comprises a first heat exchange box body and a plurality of heat exchange tubes. The middle portion of the first heat exchange box body is a closed first heat exchange space. The heat exchange tubes are connected to the first heat exchange space in the first heat exchange box body. The first working medium inlet and the first working medium outlet forming a flow channel with the heat exchange tubes are respectively provided at both ends of the first heat exchange box body.

[0009] The insulation box assembly includes an insulation box body, an insulation pipe, a connecting pipe, and an outflow pipe. The middle part of the insulation box body and the first heat exchange box body form a second heat exchange space, and the second heat exchange space is filled with phase change material. The insulation pipe is connected to the second heat exchange space in the insulation box body. Both ends of the insulation box body are respectively provided with a second working fluid inlet and a second working fluid outlet that form a flow channel with the insulation pipe; one end of the connecting pipe is connected to the second working fluid outlet, and the other end passes through the insulation box body and is connected to the first heat exchange box body; one end of the outflow pipe is connected to the first heat exchange box body, and the other end passes through the insulation box assembly and extends out.

[0010] The utility model sets up a heat preservation box component so that the second working medium absorbs the heat of the phase change material before entering the heat exchange tube box body, utilizes the heat stored in the phase change material, and improves the heat exchange efficiency. In the heat exchange process of phase change material-tube wall-water, the main thermal resistance is on the side of the phase change material, which improves the efficiency of absorbing the heat stored in the phase change material. At the same time, the heat preservation layer filled with phase change material weakens the heat convection and heat conduction between the heat exchange tube box component and the outside world, and reduces the heat dissipation.

[0011] Preferably, the two ends of the interior of the first heat exchange box are respectively connected to the first sealing plates, and the two first sealing plates form a first heat exchange space in the middle of the first heat exchange box, and the two ends of the heat exchange tube are respectively connected to the first sealing plates; the other side of the two first sealing plates forms a first working fluid cache space; the first working fluid enters from the first working fluid inlet, and flows through the first working fluid cache space, the heat exchange tube, another first working fluid cache space, and the first working fluid outlet in sequence.

[0012] Preferably, it is characterized in that the heat exchange tube box assembly is placed horizontally, and the heat exchange tubes are connected to the middle and bottom of the first heat exchange box body.

[0013] The heat exchange tubes are arranged in the middle and / or lower side of the first heat exchange box to avoid problems such as uneven heat exchange of the refrigerant caused by low water level.

[0014] Preferably, the two ends of the interior of the insulation box assembly are respectively connected to the second sealing plates, and the two second sealing plates form a second heat exchange space in the middle of the insulation box body, and the two ends of the insulation pipe are respectively connected to the second sealing plates; the other side of the two second sealing plates forms a second working fluid cache space; the second working fluid enters from the second working fluid inlet, and flows through the second working fluid cache space, the insulation pipe, another second working fluid cache space, the second working fluid outlet, the connecting pipe, and the first heat exchange box body in sequence.

[0015] Preferably, the surface of the thermal insulation pipe is connected to fins.

[0016] Fins are arranged outside the insulation tube to reduce the main thermal resistance and greatly improve the heat exchange efficiency.

[0017] Preferably, one end of the connecting pipe is connected to the second medium outlet, and the other end passes through the heat preservation box assembly and is connected to the middle of the first heat exchange space.

[0018] Preferably, one end of the outflow pipe is connected to the middle of the first heat exchange space, and the other end passes through the insulation box assembly and extends to the outside.

[0019] Preferably, the thermal insulation box assembly further includes an exhaust pipe, which is connected to the thermal insulation box body and communicates with the second heat exchange space.

[0020] Preferably, the thermal insulation box assembly surrounds and wraps around the outside of the heat exchange tube box assembly, and the length of the thermal insulation box assembly is at least consistent with the length of the first heat exchange space.

[0021] Cover the heat exchange area inside the heat exchange tube box as much as possible to improve the effect of thermal insulation and reduce heat dissipation.

[0022] Preferably, the exterior of the entire shell and tube heat exchange device is sprayed with a coating having a high reflectivity.

[0023] The outside of the heat exchange device is sprayed with a high reflectivity material, which weakens the radiation heat exchange with the outside world and reduces heat dissipation.

[0024] The advantages of the utility model are:

[0025] The utility model sets up a heat preservation box component so that the second working fluid absorbs the heat of the phase change material before entering the heat exchange tube box, utilizing the heat stored in the phase change material and improving the heat exchange efficiency. In the heat exchange process of the phase change material-tube wall-water, the main thermal resistance is on the side of the phase change material, improving the efficiency of absorbing the heat stored in the phase change material. At the same time, the heat preservation layer filled with the phase change material weakens the heat convection and heat conduction between the heat exchange tube box component and the outside world, reducing the heat dissipation;

[0026] The heat exchange tubes are arranged in the middle and / or lower side of the first heat exchange box to avoid problems such as uneven heat exchange of the refrigerant caused by low water level;

[0027] Fins are set outside the insulation tube to reduce the main thermal resistance and greatly improve the heat exchange efficiency;

[0028] The heat preservation box assembly surrounds and wraps around the outside of the heat exchange tube box assembly, and the length of the heat preservation box assembly is at least consistent with the length of the first heat exchange space; it covers the heat exchange area in the heat exchange tube box as much as possible to improve the effect of heat preservation and reduce heat dissipation;

[0029] The outside of the heat exchange device is sprayed with a high reflectivity material, which weakens the radiation heat exchange with the outside world and reduces heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of a heat storage type shell and tube heat exchange device for producing steam according to an embodiment of the utility model;

[0031] Figure 2 It is a cross-sectional view of a heat storage type shell and tube heat exchange device for producing steam according to an embodiment of the utility model;

[0032] Figure 3 It is a cross-sectional view of a heat storage type shell and tube heat exchange device for producing steam according to an embodiment of the utility model;

[0033] Numbers in the figure:

[0034] 1. heat exchange tube box assembly; 11. first heat exchange box body; 12. heat exchange tube; 13. first sealing plate; 14. first heat exchange space; 15. first working fluid buffer space; 16. first working fluid inlet; 17. first working fluid outlet;

[0035] 2. Insulation box assembly; 21. Insulation box body; 211. Exhaust pipe; 22. Insulation pipe; 23. Connecting pipe; 24. Outflow pipe; 25. Second heat exchange space; 26. Second working fluid buffer space; 27. Second working fluid inlet; 28. Second working fluid outlet; 29. ​​Second sealing plate. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] Embodiment 1:

[0038] like Figure 1 , Figure 2As shown, a heat storage type shell and tube heat exchange device for producing steam includes a heat exchange tube box assembly 1 and an insulation box assembly 2. The insulation box assembly 2 is wrapped around the outside of the heat exchange tube box assembly 1 to form a double-layer structure.

[0039] The heat exchange tube box assembly 1 includes a first heat exchange box body 11, a plurality of heat exchange tubes 12, and a first sealing plate 13; the first heat exchange box body 11 is a cylindrical structure with both ends closed, and the first sealing plate 13 is a circular plate. The two ends of the interior of the first heat exchange box body 11 are respectively connected to the first sealing plates 13, and the two first sealing plates 13 form three spaces in the first heat exchange box body 11, and a first heat exchange space 14 is formed between the two first sealing plates 13. The other side of the two first sealing plates 13 and the first heat exchange box body 11 form a first working fluid cache space 15. The length of the first heat exchange space 14 is much larger than that of the first working fluid cache space 15, and the two ends of the heat exchange tube 12 are respectively connected to the first sealing plates 13 and communicate with the first working fluid cache spaces 15 at both ends.

[0040] like Figure 2 As shown, the first working fluid inlet 16 is located at the upper part of the first working fluid buffer space 15 at the right end and at the right end of the insulated box assembly 2, and the first working fluid outlet 17 is located at the lower part of the first working fluid buffer space 15 at the left end and at the left end of the insulated box assembly 2.

[0041] The flow process of the first working fluid ( Figure 2 The flow direction is indicated by the solid arrow in the middle: the first working fluid enters from the first working fluid inlet 16 and flows into the first working fluid buffer space 15 at the right end, then flows into the heat exchange tube 12, exchanges heat with the second working fluid in the first heat exchange space 14, and after the heat exchange is completed, flows into the first working fluid buffer space 15 at the left end, and finally flows out from the first working fluid outlet 17.

[0042] like Figure 1 , Figure 2 As shown, the insulation box assembly 2 includes an insulation box body 21, an insulation pipe 22, a connecting pipe 23, an outflow pipe 24, and a second sealing plate 29. The insulation box body 21 can form a sleeve-type, double-layer structure with the first heat exchange box body 11. Therefore, the exterior of the insulation box body 21 is also a cylindrical structure, and the interior of the entire insulation box body 21 is penetrated for welding with the first heat exchange box body 11 to form a double-layer sleeve-type form.

[0043] After the insulation box body 21 is welded to the first heat exchange box body 11, second sealing plates 29 are also welded to the two ends of the interior thereof. The second sealing plates 29 separate the interior of the insulation box body 21 into three spaces. The space between the two second sealing plates 29 is the second heat exchange space 25, and the other side of the two second sealing plates 29 forms a second working fluid cache space 26. Similarly, the length of the second heat exchange space 25 is much larger than the length of the second working fluid cache space 26.

[0044] The two ends of the insulation pipe 22 are respectively connected to the second sealing plates 29 at the two ends, and can be communicated with the second working medium buffer space 26 at the two ends; a second working medium inlet 27 is provided at the top of the second working medium buffer space 26 at the right end, and the second working medium inlet 27 is communicated with the second working medium buffer space 26 and the insulation pipe 22. A second working medium outlet 28 is provided at the bottom of the second working medium buffer space 26 at the left end.

[0045] The connecting pipe 23 is a U-shaped pipe, and its main function is to introduce the second working medium into the first heat exchange space 14 to achieve heat exchange with the first working medium. Specifically, the left end of the connecting pipe 23 is connected to the second working medium outlet 28, and the other end passes through the insulation box 21 and is connected to the first heat exchange box 11. The outflow pipe 24 is a vertical pipe, and its main function is to lead the second working medium in the first heat exchange box 11 to the outside of the entire heat exchange device. Specifically, the bottom end of the outflow pipe 24 is connected to the first heat exchange box 11, and the other end passes through the insulation box 21 and extends to the outside. In this embodiment, the right end of the connecting pipe 23 is connected to the middle of the first heat exchange space 14. The bottom end of the outflow pipe 24 is connected to the middle of the first heat exchange space 14.

[0046] The heat preservation box assembly 2 further includes an exhaust pipe 211, which is connected to the heat preservation box body 21 and communicates with the second heat exchange space 25, and is used for exhausting the gas during the heat exchange process.

[0047] In this embodiment, fins are connected to the surface of the insulation tube 22. Fins are arranged outside the insulation tube 22, which reduces the main thermal resistance and greatly improves the heat exchange efficiency.

[0048] The second heat exchange space 25 and the outside of the thermal insulation tube 22 are filled with phase change material.

[0049] The flow process of the second medium ( Figure 2 The flow direction (as indicated by the dotted arrow) is as follows: the second working fluid flows from the second working fluid inlet 27 into the second working fluid buffer space 26 at the right end, then flows into the insulation tube 22, and then flows out from the left end of the insulation tube 22, flows into the second working fluid buffer space 26 at the left end, flows out from the second working fluid outlet 28 and flows into the connecting pipe 23, the connecting pipe 23 introduces the second working fluid into the first heat exchange space 14 to perform heat exchange with the first working fluid in the heat exchange tube 12, and finally flows out from the outflow pipe 24.

[0050] In this embodiment, the heat preservation box assembly 2 surrounds and wraps the outside of the heat exchange tube box assembly 1, and the length of the heat preservation box assembly 2 is at least the same as the length of the first heat exchange space 14. The heat preservation box assembly 2 covers the heat exchange area in the heat exchange tube box assembly 1 as much as possible, thereby improving the effect of heat preservation and reducing heat dissipation.

[0051] In this embodiment, the first working medium is set as refrigerant, and the second working medium is water; water first enters the insulation tube 22, and the phase change material has a heat storage function. Before entering the first heat exchange space 14, the water flows through the insulation tube 22 filled with phase change material on the outside. The finned tubes of the insulation tube 22 absorb the heat of the phase change material, and utilize the heat stored in the phase change material to improve the heat exchange efficiency. In the heat exchange process of phase change material-tube wall-water, the main thermal resistance is on the side of the phase change material. At the same time, fins are set outside the insulation tube 22 to reduce the main thermal resistance, greatly improve the heat exchange efficiency, and improve the efficiency of absorbing the heat stored by the phase change material. At the same time, the insulation layer filled with phase change material weakens the heat convection and heat conduction between the heat exchange tube box assembly 1 and the outside world, and reduces heat dissipation.

[0052] Embodiment 2:

[0053] In this embodiment, based on the above-mentioned embodiment 1, the heat exchange tube box assembly 1 is placed horizontally, and the plurality of heat exchange tubes 12 are arranged horizontally. Figure 3 As shown, the plurality of heat exchange tubes 12 are connected to the middle and bottom of the first heat exchange box 11. The heat exchange tubes 12 are arranged in the middle and / or lower side of the first heat exchange box 11 to avoid uneven refrigerant heat exchange caused by low water level.

[0054] Embodiment three:

[0055] In this embodiment, based on the first or second embodiment, the entire shell-and-tube heat exchange device is sprayed with a coating having a high reflectivity. The heat exchange device is sprayed with a high reflectivity material on the outside, which weakens the radiation heat exchange with the outside and reduces the heat dissipation.

[0056] The highly reflective material may be silver.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat storage shell and tube heat exchange device for producing steam, characterized in that: It includes a heat exchange tube box assembly and an insulation box assembly, wherein the insulation box assembly is wrapped around the outside of the heat exchange tube box assembly; The heat exchange tube box assembly comprises a first heat exchange box body and a plurality of heat exchange tubes. The middle portion of the first heat exchange box body is a closed first heat exchange space. The heat exchange tubes are connected to the first heat exchange space in the first heat exchange box body. The first working medium inlet and the first working medium outlet forming a flow channel with the heat exchange tubes are respectively provided at both ends of the first heat exchange box body. The insulation box assembly includes an insulation box body, an insulation pipe, a connecting pipe, and an outflow pipe. The middle part of the insulation box body and the first heat exchange box body form a second heat exchange space, and the second heat exchange space is filled with phase change material. The insulation pipe is connected to the second heat exchange space in the insulation box body. Both ends of the insulation box body are respectively provided with a second working fluid inlet and a second working fluid outlet that form a flow channel with the insulation pipe; one end of the connecting pipe is connected to the second working fluid outlet, and the other end passes through the insulation box body and is connected to the first heat exchange box body; one end of the outflow pipe is connected to the first heat exchange box body, and the other end passes through the insulation box assembly and extends out.

2. A heat storage type shell and tube heat exchange device for producing steam according to claim 1, characterized in that: The two ends of the interior of the first heat exchange box are respectively connected to the first sealing plates, and the two first sealing plates form a first heat exchange space in the middle of the first heat exchange box. The two ends of the heat exchange tube are respectively connected to the first sealing plates; the other side of the two first sealing plates forms a first working fluid cache space; the first working fluid enters from the first working fluid inlet, and flows through the first working fluid cache space, the heat exchange tube, another first working fluid cache space, and the first working fluid outlet in sequence.

3. A regenerative shell and tube heat exchange device for producing steam according to claim 1, characterized in that: The heat exchange tube box assembly is placed horizontally, and the heat exchange tubes are connected to the middle and bottom of the first heat exchange box body.

4. The heat storage shell and tube heat exchange device for producing steam according to claim 1, characterized in that: The two ends of the interior of the insulation box assembly are respectively connected to the second sealing plates, and the two second sealing plates form a second heat exchange space in the middle of the insulation box body, and the two ends of the insulation pipe are respectively connected to the second sealing plates; the other side of the two second sealing plates forms a second working fluid cache space; the second working fluid enters from the second working fluid inlet, and flows through the second working fluid cache space, the insulation pipe, another second working fluid cache space, the second working fluid outlet, the connecting pipe, and the first heat exchange box body in sequence.

5. The heat storage shell and tube heat exchange device for producing steam according to claim 1, characterized in that: The surface of the thermal insulation pipe is connected with fins.

6. A regenerative shell and tube heat exchange device for producing steam according to claim 1, characterized in that: One end of the connecting pipe is connected to the second medium outlet, and the other end passes through the heat preservation box assembly and is connected to the middle of the first heat exchange space.

7. The regenerative shell and tube heat exchange device for producing steam according to claim 1, characterized in that: One end of the outflow pipe is communicated with the middle of the first heat exchange space, and the other end passes through the heat preservation box assembly and extends to the outside.

8. The regenerative shell and tube heat exchange device for producing steam according to claim 1, characterized in that: The heat preservation box assembly also includes an exhaust pipe, which is connected to the heat preservation box body and communicates with the second heat exchange space.

9. The regenerative shell and tube heat exchange device for producing steam according to claim 1, characterized in that: The thermal insulation box assembly surrounds and wraps around the outside of the heat exchange tube box assembly, and the length of the thermal insulation box assembly is at least consistent with the length of the first heat exchange space.

10. The heat storage shell and tube heat exchange device for producing steam according to claim 1, characterized in that: The exterior of the entire shell and tube heat exchanger is sprayed with a coating having a high reflectivity.

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