Horizontal heat exchanger

Abstract

A horizontal heat exchanger comprises a horizontal shell pass barrel with a round cross section, and the axial direction of the shell pass barrel is recorded as the left-right direction; the two tube plates are respectively arranged at two ends of the shell pass cylinder; the coiled tube type core body is arranged in the shell pass cylinder in the left-right direction, the cross section of the coiled tube type core body is circular, and the two ends of each heat exchange tube are supported on the corresponding tube plates respectively; the coiled tube type core body is arranged obliquely upwards relative to the central axis of the shell pass cylinder body, so that a cavity with a crescent cross section is formed between the coiled tube type core body and the inner wall surface of the corresponding shell pass cylinder body; the tubular core body is arranged in the cavity in the left-right direction, the straight pipes are located below the tubular core body and extend in the left-right direction, the straight pipes are arranged at intervals, so that the cross section of the tubular core body is in a crescent shape matched with the shape of the cavity, and the two ends of each straight pipe are supported on the corresponding tube plates respectively. The heat exchanger is suitable for the horizontal heat exchanger with the shell pass for gas-liquid two-phase flow heat exchange, and temperature crossing of tube pass media in the heat exchange tube of the wound tube type core body is avoided.

Description

Technical Field

[0001] This invention belongs to the field of heat exchange technology, specifically relating to a horizontal heat exchanger. Background Technology

[0002] Spiral wound tube heat exchangers, as a type of high-efficiency and energy-saving heat exchanger, typically include a shell-side shell, tube sheets at both ends of the shell-side shell, a tube box, and heat exchange tubes spirally wound inside the shell-side shell. The two ends of the heat exchange tubes are supported on corresponding tube sheets and connected to corresponding tube boxes. During heat exchange, the tube-side medium enters the heat exchange tubes through the tube box and exchanges heat with the shell-side medium inside the shell-side shell.

[0003] For horizontal wound tube heat exchangers where the shell-side medium is a two-phase flow of gas and liquid (after heat exchange, some of the shell-side medium will liquefy, and the liquefied shell-side medium will be in the lower space of the shell-side cylinder, while the upper space of the shell-side cylinder is the unliquefied gas phase medium), the spirally wound heat exchange tubes are simultaneously located in the upper and lower spaces of the shell-side cylinder, causing temperature crossover of the tube-side medium within the heat exchange tubes, resulting in inaccurate heat transfer calculations.

[0004] To this end, Chinese invention patent application No. 202510125311.9, entitled "A Horizontal Heat Exchanger" (publication number CN119826580A), discloses a horizontal heat exchanger, comprising: a horizontally lying shell-side cylinder, with the axial direction of the shell-side cylinder being the left-right direction; the upper part of the shell-side cylinder is provided with a shell-side inlet pipe and a shell-side gas phase outlet pipe, and the lower part is provided with a shell-side liquid phase outlet pipe; two tube sheets, respectively disposed at both ends of the shell-side cylinder; two tube boxes with tube-side pipes, respectively disposed on their respective tube sheets; a heat exchange core having multiple heat exchange tubes extending in the left-right direction and a jacket sleeved around the entire periphery of the multiple heat exchange tubes; at least two heat exchange cores are disposed in the upper and lower spaces inside the shell-side cylinder, the two ends of the heat exchange tubes of each heat exchange core are respectively supported on their respective tube sheets and connected to the tube boxes on the tube sheets, and the jacket of each heat exchange core has multiple through holes distributed for the flow of shell-side medium. This horizontal heat exchanger is suitable for heat exchange with gas and liquid two-phase flow in the shell side, avoiding temperature crossover of the medium in the tube side within a single heat exchange core. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a horizontal heat exchanger that is also applicable to gas-liquid two-phase flow heat exchange in the shell side, in order to avoid temperature crossover of the tube side medium in the heat exchange tube with the tube-shaped core, in view of the current status of the prior art.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a horizontal heat exchanger, comprising:

[0007] A shell-side cylinder with a circular cross-section is laid horizontally. The axial direction of the shell-side cylinder is defined as the left-right direction. The upper part of the shell-side cylinder is provided with a shell-side inlet pipe and a shell-side gas phase outlet pipe, and the lower part of the shell-side cylinder is provided with a shell-side liquid phase outlet pipe.

[0008] Two tube sheets are respectively disposed at both ends of the shell-side cylinder;

[0009] The wound tube core, located in the shell-side cylinder along the left-right direction, has multiple heat exchange tubes that are spirally wound layer by layer from the inside out to form a multi-layer spiral tube, so that the cross-section of the wound tube core is circular, and the two ends of each heat exchange tube are respectively supported on their respective tube sheets.

[0010] Its features are:

[0011] The wound core is positioned slightly above the central axis of the shell-side cylinder, so that a crescent-shaped chamber is formed between the wound core and the inner wall of the corresponding shell-side cylinder.

[0012] It also includes:

[0013] The tubular core, located in the chamber along the left-right direction, is below the wound core and has multiple straight tubes extending left and right. The straight tubes are arranged at intervals so that the cross-section of the tubular core is crescent-shaped and adapted to the shape of the chamber. The two ends of each straight tube are supported by their respective tube sheets.

[0014] By combining a crescent-shaped tubular core with a circular-shaped coiled core, the internal space of the shell-side cylinder can be fully utilized. The liquefied portion of the shell-side medium can exchange heat with the tubular core, achieving condensate subcooling, and then exiting from the shell-side liquid phase outlet pipe. The unliquefied shell-side medium exchanges heat with the coiled core, and the non-condensable gas is exited from the shell-side gas phase outlet pipe after heat exchange. Therefore, this invention ensures that the liquefied portion of the shell side only exchanges heat within the straight tubes of the tubular core, which is suitable for heat exchange in a two-phase flow of gas and liquid in the shell side, avoiding temperature crossover of the tube-side medium within the heat exchange tubes of the coiled core.

[0015] In addition, each layer of spiral tubes can be made by winding one or more heat exchange tubes.

[0016] Preferably, the spiral tube has a spirally wound section and straight tube sections located on the left and right sides of the spiral section and extending to the left and right;

[0017] The spiral core also has a jacket, which is fitted around the outer periphery of the spiral section of the outermost spiral tube, and the bottom of the jacket has a through hole for the shell-side medium to flow through. In use, a portion of the liquefied shell-side medium can flow downwards through the through hole to the tubular core for heat exchange.

[0018] Preferably, the shell-side gas phase outlet pipe is located in the upper part of the chamber and is configured corresponding to the straight section of the helical tube. This allows the non-condensable gas to be output using the space in the upper part of the chamber.

[0019] Preferably, the tubular core also has multiple baffles, which are arranged at intervals in the left-right direction to form a baffle channel, and each baffle is provided with a perforation for the straight tube to pass through;

[0020] The jacket is supported on the baffle plate.

[0021] That is, the baffle of the present invention can form a baffle channel, which can promote the heat exchange effect and support the jacket above, preventing the horizontally lying wound tube core from falling due to deflection.

[0022] Furthermore, at least the leftmost and / or rightmost baffles are provided with rollers at their bottom, which are able to roll and support the inner wall of the shell-side cylinder. The rollers provide support and facilitate the movement of the core within the shell-side cylinder, thereby facilitating the easy assembly of the core into the shell-side cylinder.

[0023] Furthermore, the diameter of the wound-tube core is larger than the radius of the inner wall of the shell-side cylinder. That is, the wound-tube core of the present invention functions as the main heat exchange core.

[0024] In the above schemes, preferably, there are two tube boxes, each set on its corresponding tube sheet.

[0025] During heat exchange, the tube-side medium can enter one of the tube boxes, then be split and enter the wound tube core and the shell-and-tube core respectively, and finally converge and be output in the other tube box.

[0026] To further facilitate the subcooling of the condensate in the shell-side medium and the cooling of the non-condensable gas, preferably, one of the two tube boxes is referred to as the first tube box, and the tube sheet containing the first tube box is referred to as the first tube sheet.

[0027] The first pipe box is provided with a partition to divide the internal space of the first pipe box into a first part located on the upper side of the partition and a second part located on the lower side of the partition;

[0028] The first end of each heat exchange tube of the wound tube core is supported on the upper part of the first tube sheet and connected to the first part of the first tube box;

[0029] The first end of each straight tube of the tubular core is supported at the lower part of the first tube sheet and connected to the second part of the first tube box;

[0030] Furthermore, the first pipe box is equipped with a pipe inlet connector that connects to the second part and a pipe outlet connector that connects to the first part.

[0031] The low-temperature tube-side medium first enters the second part of the first tube box through the tube-side inlet pipe, and then enters the shell-and-tube core to exchange heat with the condensate after the shell-side medium has condensed, thus achieving condensate subcooling. The tube-side medium output from the shell-and-tube core then enters the coiled tube core for heat exchange, thus achieving non-condensable gas cooling, and finally exits through the first part of the first tube box and the tube-side outlet pipe.

[0032] Furthermore, the partition is an arc shape that gradually curves downward from the left and right sides to the center.

[0033] Compared with the prior art, the advantages of the present invention are as follows: by combining the crescent-shaped tubular core with the circular-shaped coiled core, the internal space of the shell-side cylinder can be fully utilized. The liquefied portion of the shell-side medium can exchange heat with the tubular core, achieving condensate subcooling, and then be discharged from the shell-side liquid phase outlet pipe. The unliquefied shell-side medium exchanges heat with the coiled core, and the non-condensable gas is discharged from the shell-side gas phase outlet pipe after heat exchange. Therefore, the present invention ensures that the liquefied portion of the shell side only exchanges heat in the straight tubes of the tubular core, which is suitable for heat exchange in a two-phase flow of gas and liquid in the shell side, and avoids temperature crossover of the tube-side medium in the heat exchange tubes of the coiled core. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the horizontal heat exchanger according to Embodiment 1 of the present invention;

[0035] Figure 2 This is a cross-sectional view of the horizontal heat exchanger according to Embodiment 1 of the present invention;

[0036] Figure 3 This is a schematic diagram of the baffle plate according to Embodiment 1 of the present invention;

[0037] Figure 4 This is a schematic diagram of another baffle plate according to Embodiment 1 of the present invention;

[0038] Figure 5 This is a schematic diagram of the structure of the horizontal heat exchanger according to Embodiment 2 of the present invention;

[0039] Figure 6 This is a cross-sectional view of the horizontal heat exchanger according to Embodiment 2 of the present invention;

[0040] Figure 7 for Figure 5 Sectional view of AA;

[0041] Figure 8 This is a schematic diagram of the rightmost baffle plate in Embodiment 2 of the present invention. Detailed Implementation

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Example 1

[0043] like Figures 1-4 As shown, this is a preferred embodiment of a horizontal heat exchanger of the present invention. The horizontal heat exchanger includes a shell-side cylinder 1, a wound tube core 2, a shell-and-tube core 3, a tube sheet, and a tube box.

[0044] The shell-side cylindrical body 1 is arranged horizontally, with its axis defined as the left-right direction. The cross-section of the shell-side cylindrical body 1 is circular. A shell-side inlet pipe 11 is located on the upper left side of the shell-side cylindrical body 1, a shell-side gas phase outlet pipe 12 is located on the upper right side of the shell-side cylindrical body 1, and a shell-side liquid phase outlet pipe 13 is located on the lower right side of the shell-side cylindrical body 1. In this embodiment, the number and location of each pipe can be designed according to the design operating conditions.

[0045] There are two tube sheets, located at both ends of the shell-side cylinder 1. There are also two tube boxes, located on their respective tube sheets, and each tube box is equipped with a tube-side connector for the tube-side medium to pass through.

[0046] The wound-tube core 2 is disposed within the shell-side cylindrical body 1 along a left-right direction and has multiple heat exchange tubes 20, which are spirally wound layer by layer from the inside out to form a multi-layered spiral tube, resulting in a circular cross-section for the wound-tube core 2. The spiral tube has a spirally wound section 21 and straight tube sections 22 located on both sides of the spiral section 21 and extending left and right. The ends of the two straight tube sections 22 serve as the two ends of the heat exchange tubes 20, respectively supported by their corresponding tube sheets. The wound-tube core 2 also has a jacket 23, which is fitted around the outer periphery of the spiral section 21 of the outermost spiral tube, and the bottom of the jacket 23 has a through hole 231 for the flow of the shell-side medium. In this embodiment, the diameter of the wound-tube core 2 is larger than the radius of the inner wall surface of the shell-side cylindrical body 1. Furthermore, the wound core 2 is positioned slightly above the central axis 10 of the shell-side cylinder 1, thereby forming a crescent-shaped chamber 14 between the wound core 2 and the inner wall surface of the corresponding shell-side cylinder 1. The shell-side gas phase outlet pipe 12 is located at the upper part of the chamber 14 and is positioned corresponding to the straight pipe section 22 on the right side of the spiral tube.

[0047] The tubular core 3 is disposed within the chamber 14 along the left-right direction, below the coiled core 2, and has multiple straight tubes 30 extending left and right. These straight tubes 30 are spaced apart, causing the cross-section of the tubular core 3 to be crescent-shaped, conforming to the shape of the chamber 14. Each straight tube 30 is supported at both ends by its corresponding tube sheet. The tubular core 3 also has multiple baffles 31, which are spaced apart along the left-right direction to form a baffle channel for the shell-side medium to flow through. Each baffle 31 has a perforation for the straight tubes 30 to pass through. In this embodiment, the shape of each baffle 31 matches the cross-sectional shape of the chamber 14, so that the jacket 23 is supported on the baffle 31. Specifically, as shown... Figure 3 , 4As shown, the baffle 31 is a part of the crescent-shaped plate, and for two adjacent baffles 31 on the left and right (such as...) Figure 3 , 4 The two baffles 31 are mirror-symmetrical, one in front of the other and the whole is crescent-shaped, so that they can form a baffle channel and support the wound tube core.

[0048] During heat exchange, the low-temperature tube-side medium (such as low-temperature water) can first enter the left-side tube box, then be split and simultaneously enter the shell-and-tube core 3 and the coiled-tube core 2 to exchange heat with the shell-side medium, and then converge and exit in the right-side tube box. Alternatively, the low-temperature tube-side medium can also first enter the right-side tube box, then be split and simultaneously enter the shell-and-tube core 3 and the coiled-tube core 2 to exchange heat with the shell-side medium, and then converge and exit in the left-side tube box.

[0049] By combining the crescent-shaped tubular core 3 with the circular-shaped coiled core 2, the internal space of the shell-side cylinder 1 can be fully utilized. The liquefied portion of the shell-side medium can exchange heat with the tubular core 3 to achieve condensate subcooling, and then be discharged from the shell-side liquid phase outlet pipe 12. The unliquefied shell-side medium exchanges heat with the coiled core 2, and the non-condensable gas is discharged from the shell-side gas phase outlet pipe 12 after heat exchange. Therefore, the present invention ensures that the liquefied portion of the shell side only exchanges heat in the straight tubes of the tubular core, which is suitable for heat exchange in a two-phase flow of gas and liquid in the shell side, and avoids temperature crossover of the tube-side medium in the heat exchange tubes of the coiled core. Example 2

[0050] like Figures 5-8 As shown, this is a preferred embodiment of a horizontal heat exchanger of the present invention. This embodiment is basically the same as the first embodiment, except that in this embodiment, a rotating wheel 32 is provided at the bottom of the rightmost baffle 31, and can be rolled and supported on the inner wall surface of the shell-side cylinder 1. The structure of the rotating wheel 32 is as follows: Figure 5 , 7 As shown, the design supports the baffle plate 31 while allowing the tubular core to move left and right along the shell-side cylinder, thus facilitating core support. In this embodiment, the rightmost baffle plate 31 is located to the right of the shell-side liquid phase outlet nozzle 13, corresponding to the straight pipe section 22 on the right side of the helical tube. The rightmost baffle plate 31 has a complete crescent shape that matches the chamber shape, serving a supporting function.

[0051] Meanwhile, one of the two tube boxes is designated as the first tube box 5, and the tube sheet containing the first tube box 5 is designated as the first tube sheet 4. In this embodiment, the first tube box 5 and the first tube sheet 4 are located on the left side of the heat exchanger. The first tube box 5 is provided with a partition 50, which is an arc shape that gradually concaves from the left and right sides to the center. The partition 50 divides the internal space of the first tube box 5 into a first part 51 located on the upper side of the partition 50 and a second part 52 located on the lower side of the partition 50. The first end of the left side of each heat exchange tube 20 of the wound tube core 2 is supported on the upper part of the first tube sheet 4 and connects to the first part 51 of the first tube box 5. The first end of the left side of each straight tube 30 of the tube core 3 is supported on the lower part of the first tube sheet 4 and connects to the second part 52 of the first tube box 5. The first tube box 5 is provided with a tube-side inlet pipe 53 connecting to the second part 52 and a tube-side outlet pipe 54 connecting to the first part 51.

[0052] During heat exchange, the low-temperature tube-side medium (such as low-temperature water) first enters the second part 52 of the first tube box 5 through the tube-side inlet pipe 53, and then enters the shell-and-tube core 3 to exchange heat with the condensate after the shell-side medium has condensed, thereby achieving condensate subcooling. The tube-side medium output from the shell-and-tube core 3 enters the coiled tube core 2 through the tube box on the right side for heat exchange, thereby achieving non-condensable gas cooling, and finally outputs through the first part 51 of the first tube box 5 and the tube-side outlet pipe 54.

[0053] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A horizontal heat exchanger, comprising: A shell-side cylinder (1) with a circular cross-section lying horizontally, with the axial direction of the shell-side cylinder (1) being the left and right direction. The upper part of the shell-side cylinder (1) is provided with a shell-side inlet pipe (11) and a shell-side gas phase outlet pipe (12), and the lower part of the shell-side cylinder (1) is provided with a shell-side liquid phase outlet pipe (13). Two tube sheets are respectively disposed at both ends of the shell-side cylinder (1); The coiled core (2) located in the shell-side cylinder (1) along the left and right direction has multiple heat exchange tubes (20), which are spirally wound layer by layer from the inside to the outside to form a multi-layer spiral tube, so that the cross-section of the coiled core (2) is circular, and the two ends of each heat exchange tube (20) are respectively supported on their respective tube sheets. Its features are: The wound core (2) is positioned slightly above the central axis (10) of the shell-side cylinder (1), so that a crescent-shaped chamber (14) is formed between the wound core (2) and the inner wall of the corresponding shell-side cylinder (1). It also includes: The tubular core (3) located in the chamber (14) along the left-right direction is below the wound core (2) and has multiple straight tubes (30) extending left and right. The straight tubes (30) are arranged at intervals so that the cross-section of the tubular core (3) is crescent-shaped and adapted to the shape of the chamber (14). The two ends of each straight tube (30) are respectively supported on their corresponding tube sheets.

2. The horizontal heat exchanger according to claim 1, characterized in that: The spiral tube has a spiral section (21) with spiral winding and a straight tube section (22) located on the left and right sides of the spiral section (21) and extending to the left and right; The wound core (2) also has a jacket (23), which is fitted around the outer periphery of the spiral section (21) of the outermost spiral tube, and the bottom of the jacket (23) is provided with a through hole (231) for the shell side medium to flow.

3. The horizontal heat exchanger according to claim 2, characterized in that: The shell-side gas phase outlet pipe (12) is located at the upper part of the chamber (14) and is provided corresponding to the straight pipe section (22) of the spiral tube.

4. The horizontal heat exchanger according to claim 2, characterized in that: The tubular core (3) also has multiple baffles (31) arranged at intervals in the left and right direction to form a baffle channel, and each baffle (31) is provided with a perforation for the straight tube (30) to pass through; The jacket (23) is supported on the baffle plate (31).

5. The horizontal heat exchanger according to claim 4, characterized in that: At least the leftmost or / and rightmost baffle (31) has a wheel (32) at its bottom, which can be rolled and supported on the inner wall of the shell-side cylinder (1).

6. The horizontal heat exchanger according to claim 1, characterized in that: The diameter of the wound core (2) is greater than the radius of the inner wall of the shell-side cylinder (1).

7. The horizontal heat exchanger according to any one of claims 1 to 6, characterized in that: It also includes two tube boxes, each located on its corresponding tube sheet.

8. The horizontal heat exchanger according to claim 7, characterized in that: Let one of the two pipe boxes be the first pipe box (5), and the pipe sheet on which the first pipe box (5) is located be the first pipe sheet (4); The first pipe box (5) is provided with a partition (50) to divide the internal space of the first pipe box (5) into a first part (51) located on the upper side of the partition (50) and a second part (52) located on the lower side of the partition (50); The first end of each heat exchange tube (20) of the wound tube core (2) is supported on the upper part of the first tube sheet (4) and connected to the first part (51) of the first tube box (5); The first end of each straight tube (30) of the tubular core (3) is supported at the lower part of the first tube sheet (4) and connected to the second part (52) of the first tube box (5); The first pipe box (5) is provided with a pipe inlet pipe (53) that connects to the second part (52) and a pipe outlet pipe (54) that connects to the first part (51).

9. The horizontal heat exchanger according to claim 8, characterized in that: The partition (50) is an arc shape that gradually curves downward from the left and right sides to the center.

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