Winding pipe type heat exchanger
By designing a wound tube heat exchanger, efficient condensation and gas-liquid separation of the tower top gas were achieved, solving the problems of cumbersome equipment and high energy consumption in the existing technology, simplifying the equipment structure, and reducing energy consumption and operating costs.
Patent Information
- Application Number
- CN202520388771.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-06
AI Technical Summary
In existing technologies, the top gas condensation system is cumbersome, has a large resistance drop, is difficult to guarantee vacuum, has high energy consumption, and occupies a large area with high operation and maintenance costs.
Design a wound tube heat exchanger with a shell side and a tube side. The heat exchange tubes in the tube side are wound vertically in a spiral, and the shell side has a chamber and vertically extending independent channels to achieve medium condensation and gas-liquid separation, reducing the need for downstream equipment.
It simplifies the equipment structure, reduces energy consumption, improves vacuum level, and reduces equipment footprint and operation and maintenance costs.
Smart Images
Figure CN223896612U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to heat exchanger technical field, concretely relates to a kind of wound pipe heat exchanger. BACKGROUND
[0002] Conventional vacuum overhead gas temperature is lower, and heat recovery is difficult, overhead gas is directly cooled by air cooling and / or water cooling, and the liquid phase after condensation enters a separate storage tank, and a non-condensable gas condensation recovery and vacuum extraction connection are provided above the storage tank, please refer to Figure 1 In the prior art, the overhead condensation, separation of non-condensable gas after condensation and vacuum system are complicated, and the resistance drop is large, which makes it difficult to ensure the vacuum degree of the vacuum overhead pressure or the energy consumption is high. And because of the above problems, the vacuum degree of the vacuum tower is reduced, the operating temperature of the vacuum tower is high, the feed of the vacuum tower needs to be heated directly by a heat source, and the heat source temperature is high, and the operating energy consumption of the vacuum tower is large.
[0003] At the same time, the air cooling and / or water cooling condenser, storage tank, pump, condenser and other equipment above the storage tank used for cooling the overhead gas are more, occupy more land, and the operation and maintenance cost is higher. UTILITY MODEL CONTENT
[0004] The utility model solves the technical problem to be solved, provides a kind of wound pipe heat exchanger that can be used for medium condensation of overhead gas waiting condensation, to reduce the number of downstream equipment.
[0005] The technical scheme adopted by the utility model to solve the above technical problem is: a kind of wound pipe heat exchanger, vertically arranged, and having shell side and tube side inside, the heat exchange tube forming the tube side is spirally wound along the outer periphery of the center cylinder in vertical direction, and the tube side has tube side inlet for inputting cold medium, and tube side outlet for outputting cold medium after heat exchange;
[0006] Characterized in that:
[0007] The upper part of the shell side has shell side inlet for inputting medium to be condensed, and the lower part of the shell side has cavity for receiving condensed liquid, and has shell side liquid phase outlet for outputting condensed liquid in the cavity;At the same time, the upper part of the shell side has shell side gas phase outlet for outputting non-condensable gas, and the center cylinder is hollow inside to form a vertical independent channel, and the lower port of the independent channel is located above the cavity to supply non-condensable gas to enter the independent channel upward, and the upper port of the independent channel is communicated to the shell side gas phase outlet.
[0008] The medium to be condensed enters the shell side through the shell side inlet, flows downward and exchanges heat with the cold medium in the tube side to be condensed, and then flows to the chamber under the action of gravity, and is output from the shell side liquid phase outlet. The non-condensable gas enters the independent channel in the center cylinder from the lower end of the center cylinder, and then flows upward and is discharged from the shell side gas phase outlet. In this process, the chamber functions as a "storage tank" without the need for additional storage tanks or condensers and other equipment above the storage tanks. Therefore, the design of the wound tube heat exchanger can simplify the downstream equipment.
[0009] Preferably, the shell side gas phase outlet is located at the top of the shell side, and the upper end of the center cylinder extends upward to the shell side gas phase outlet. Thus, the structure can be simplified.
[0010] Also preferably, the shell side gas phase outlet is located at the side of the shell side, and the upper end of the center cylinder is connected to the shell side gas phase outlet through the intermediate pipeline.
[0011] Further, the shell side is provided with:
[0012] The upper distribution plate and the lower distribution plate are arranged above the center cylinder with their plate surfaces opposite each other, and their edges are connected to the shell side wall to form the intermediate pipeline between them. The central part of the lower distribution plate is provided with a through hole to connect the intermediate pipeline and the independent channel.
[0013] The connecting pipe is hollow and can conduct heat. The connecting pipe is vertically inserted into the upper distribution plate and the lower distribution plate, and the upper end of the connecting pipe is open to the upper distribution plate. The lower end of the connecting pipe is open to the lower distribution plate and located outside the through hole.
[0014] The shell side inlet is located above the upper distribution plate.
[0015] Thus, the medium to be condensed entering from the shell side inlet enters the space below the lower distribution plate through the connecting pipe and exchanges heat with the cold medium in the tube side. Before heat exchange, the medium to be condensed in the connecting pipe can preheat the non-condensable gas in the intermediate pipeline to prevent the non-condensable gas from carrying uncondensed gas phase into the downstream vacuum pump through the shell side gas phase outlet, causing liquid droplets and damaging the equipment.
[0016] To ensure the preheating effect of the non-condensable gas, preferably, the connecting pipe has multiple connecting pipes arranged on the upper and lower distribution plates. The design of multiple connecting pipes can achieve uniform flow of the medium to be condensed, so that the medium to be condensed can uniformly enter the space below the lower distribution plate and exchange heat with the tube side medium in the heat exchange tube, ensuring the heat exchange effect.
[0017] Further, the shell side is provided with an annular tube internally hollowed to form the intermediate pipeline, which is circumferentially arranged on the periphery of the upper end of the central cylinder and is in communication with the central cylinder and the shell side gas phase outlet.
[0018] In the above solutions, preferably, a plurality of fins are vertically spaced in the central cylinder, and each fin extends upwardly and obliquely from the inner wall surface of the central cylinder. The fins can improve the liquid removal effect on the non-condensed gas and enhance the bending strength of the central cylinder.
[0019] Preferably, the connection between the fin and the inner wall surface of the central cylinder is provided with a liquid leakage hole for the condensed liquid to pass into the chamber.
[0020] Preferably, the fin is arranged relatively close to the lower end of the central cylinder.
[0021] In the above solutions, preferably, the cylinder wall of the central cylinder is a heat-conducting wall. Since the outer periphery of the central cylinder is provided with the heat exchange tube, the cold energy of the cold medium in the heat exchange tube can be transmitted to the central cylinder through the cylinder wall of the central cylinder, so that the non-condensed gas in the central cylinder can be further condensed, thereby improving the liquid removal effect on the non-condensed gas.
[0022] Compared with the prior art, the advantages of the present application are that: through the design of the shell side inlet and the shell side gas phase outlet, and the arrangement of the chamber in the shell side and the central cylinder internally hollowed to form the vertically extending independent channel, when heat exchange, the medium to be condensed enters the shell side through the shell side inlet, flows downward and exchanges heat with the cold medium in the tube side to be condensed, and then the condensed liquid flows into the chamber under the action of its own gravity, and then is output from the shell side liquid phase outlet, and the non-condensed gas enters the independent channel in the central cylinder from the lower port of the central cylinder, and then flows upward and is discharged from the shell side gas phase outlet. In this process, the chamber plays the role of "storage tank" without the need for additional storage tank. Therefore, the design of the present application can simplify the downstream equipment. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 FIG. 1 is a structural schematic view of a vacuum tower top condensation reflux system in the prior art;
[0024] Figure 2 FIG. 2 is a structural schematic view of a vacuum tower top condensation reflux system according to an embodiment of the present application;
[0025] Figure 3 FIG. 3 is a longitudinal sectional view of a wound tube type heat exchanger according to the embodiment of the present application;
[0026] Figure 4 FIG. 4 is a structural schematic view of a vacuum tower top condensation reflux system according to another embodiment of the present application; Figure 3 FIG. 5 is an enlarged view of the A part in FIG. 4;
[0027] Figure 5 As Figure 4 A top view of the middle fin;
[0028] Figure 6 As Figure 4 A B direction schematic view of the middle fin;
[0029] Figure 7 A longitudinal sectional view of the winding pipe heat exchanger of the second embodiment of the utility model;
[0030] Figure 8 A longitudinal sectional view of the winding pipe heat exchanger of the third embodiment of the utility model. DETAILED DESCRIPTION
[0031] The utility model will be further described in detail below in combination with the embodiment of the drawings.
[0032] Embodiment one:
[0033] As Figures 2 to 6 Illustrated, it is the preferred embodiment one of the winding pipe heat exchanger of the utility model, the winding pipe heat exchanger can be used for the condensation of vacuum tower top gas, this embodiment is described in combination with vacuum tower, and the specific as follows:
[0034] Vacuum tower 1 is prior art.
[0035] Winding pipe heat exchanger 2 is vertically arranged at the upper of vacuum tower 1, has the shell side cylinder of forming shell side 22, the center cylinder 20 of being vertically arranged in the shell side cylinder, the heat exchange pipe of being spirally wound in the outer periphery of center cylinder 20 along vertical direction, the heat exchange pipe forms pipe side 21, and pipe side 21 has two, and they are first pipe side 211 and second pipe side 212 respectively, first pipe side entrance 211a is used to feed raw material, and first pipe side exit 211b is communicated to the inside of vacuum tower 1 through pipeline, and second pipe side entrance 212a is used to feed external cold source, and second pipe side exit 212b is used to output the cold source after heat exchange. At the same time, the top of shell side cylinder is equipped with the shell side entrance 22a for the input of vacuum tower top gas, and the shell side entrance 22a is communicated to the top exit of vacuum tower 1 through pipeline. The bottom space of shell side cylinder is the chamber 220 for receiving the condensed liquid after the condensation of vacuum tower top gas, and the chamber 220 is located below the center cylinder 20, and the bottom of chamber 220 is equipped with the shell side liquid phase exit 22b for the output of condensed liquid, and the shell side liquid phase exit 22b is communicated to vacuum tower 1 and downstream equipment through two pipelines respectively, and the pipeline for communicating shell side liquid phase exit 22b and vacuum tower 1 is equipped with the valve for controlling flow. At the same time, the inside of center cylinder 20 is hollow and forms independent passage. The lower end of independent passage is located above the chamber 220 to supply non-condensable gas to pass upward, and the upper end of independent passage is communicated to the shell side gas phase exit 22c on the upper part of the lateral wall of shell side cylinder through intermediate pipe 26, and the shell side gas phase exit 22c is used to be communicated to vacuum pump.
[0036] In the embodiment, the shell side cylinder is provided with an upper distribution plate 261, a lower distribution plate 262 and a plurality of connecting pipes 264. The upper distribution plate 261 and the lower distribution plate 262 are arranged above the central cylinder 20 with their plate surfaces opposite to each other, and their edges are connected with the side wall of the shell side cylinder to form the intermediate pipeline 26 between them. The lower distribution plate 262 is provided with a through hole 263 in the center to connect the intermediate pipeline 26 with the independent channel in the central cylinder 20. The connecting pipes 264 are hollow and can conduct heat. The connecting pipes 264 are arranged in the horizontal direction and are vertically inserted into the upper distribution plate 261 and the lower distribution plate 262. The upper end of the connecting pipe 264 is located above the upper distribution plate 261, and the lower end of the connecting pipe 264 is located below the lower distribution plate 262 and the periphery of the through hole 263, so that the vacuum tower top gas entering from the shell side inlet 22a can flow downward through the connecting pipe 264 to the space below the lower distribution plate 262 to exchange heat with the cold medium in the heat exchange pipe and condense. The condensed liquid is collected in the chamber 220, and the non-condensable gas enters the central cylinder 20 from the lower end.
[0037] The non-condensable gas entering the central cylinder 20 may carry uncondensed gas phase. In order to further remove the liquid from the non-condensable gas entering the central cylinder 20, the wall of the central cylinder 20 is a heat-conducting wall, and a plurality of fins 201 are vertically and spaced apart in the central cylinder 20. The fins 201 are arranged close to the lower end of the central cylinder 20. Each fin 201 extends upwardly from the inner wall of the central cylinder 20, and a liquid leakage hole 202 is arranged at the connection between each fin 201 and the inner wall of the central cylinder 20 to allow the liquid to flow downward and be collected in the chamber 220. The non-condensable gas continues to flow upward through the fins 201 into the intermediate pipeline 26. At this time, the vacuum tower top gas passing through the connecting pipe 264 can preheat the non-condensable gas in the intermediate pipeline 26 to prevent the non-condensable gas from carrying uncondensed gas phase into the vacuum pump to produce liquid droplets and damage the equipment. In the embodiment, since the fins 201 are arranged close to the lower end of the central cylinder 20, and the lower end of the central cylinder 20 is close to the tube side inlet, the cold medium with low temperature can condense and remove the liquid from the non-condensable gas in the central cylinder 20.
[0038] The winding pipe heat exchanger of the embodiment replaces the original tower top condenser (air cooling + water cooling), storage tank, reflux pump and distillate pump, reduces equipment investment and has significant energy saving effect. The winding pipe heat exchanger uses the central cylinder as a gas-liquid separation space, which helps to reduce the size and height of the equipment, thereby reducing the resistance loss and improving the vacuum degree of the tower and reducing the energy consumption of the vacuum pump.
[0039] Embodiment two:
[0040] As Figure 7As shown in the preferred embodiment two of the vacuum tower top condensation reflux system of the utility model, this embodiment is basically same with embodiment one, the difference lies in that in this embodiment, the annular pipe that hollow inside is arranged on the periphery of the upper end of the center cylinder 20 along the circumference and is connected with the center cylinder 20 and the shell side gas phase outlet 22c.
[0041] Embodiment three:
[0042] As Figure 8 shown, it is the preferred embodiment three of the vacuum tower top condensation reflux system of the utility model, this embodiment is basically same with embodiment one, the difference lies in that in this embodiment, the shell side gas phase outlet 22c is located at the top of the shell side cylinder, and the upper end of the center cylinder 20 extends upward and is directly connected to the shell side gas phase outlet 22c.
[0043] In the specification and claims of the utility model, the terms indicating direction, such as "up", "down", "side", "top", "bottom" and the like, are used to describe various example structural parts and elements of the utility model, but these terms are only used for the purpose of convenient description, and are determined based on the example orientation shown in the drawings. Since the disclosed embodiments of the utility model can be arranged in different directions, these terms indicating direction are only used for description and should not be regarded as limitation, for example, "up" and "down" are not necessarily limited to the direction opposite or consistent with the direction of gravity.
[0044] In the specification and claims of the utility model, the term "vertical" is also used, which means basically along the up-down direction, and is not limited to only the vertical direction, but can also be slightly inclined relative to the vertical direction.
Claims
1. A spiral wound tube heat exchanger, which is arranged vertically and has a shell side (22) and a tube side (21) inside, wherein the heat exchange tubes forming the tube side (21) are spirally wound around the outer periphery of a central cylinder (20) in a vertical direction, and the tube side (21) has a tube side inlet for input of cold medium and a tube side outlet for output of cold medium after heat exchange. Its features are: The upper part of the shell side (22) has a shell side inlet (22a) for inputting the medium to be condensed, and the lower part of the shell side (22) has a chamber (220) for receiving condensate and a shell side liquid phase outlet (22b) for outputting condensate from the chamber (220); at the same time, the upper part of the shell side (22) has a shell side gas phase outlet (22c) for outputting non-condensable gas. The hollow interior of the central cylinder (20) forms a vertically extending independent channel. The lower port of the independent channel is located above the chamber (220) so that non-condensable gas can pass upward and enter the independent channel. The upper port of the independent channel is connected to the shell side gas phase outlet (22c).
2. The wound tube heat exchanger according to claim 1, characterized in that: The shell-side gas phase outlet (22c) is located at the top of the shell side (22), and the upper end of the central cylinder (20) extends upward to the shell-side gas phase outlet (22c).
3. The wound tube heat exchanger according to claim 1, characterized in that: The shell-side gas phase outlet (22c) is located on the side of the shell side (22), and the upper end of the central cylinder (20) is connected to the shell-side gas phase outlet (22c) through an intermediate pipe (26).
4. The wound tube heat exchanger according to claim 3, characterized in that: The shell side (22) is provided with: The upper distribution plate (261) and the lower distribution plate (262) are arranged above the central cylinder (20) with their surfaces facing each other. The edges of the two plates are connected to the side wall of the shell side (22) so that the two plates and the side wall of the shell side (22) form the aforementioned intermediate pipeline (26). The lower distribution plate (262) has a through hole (263) in the center to connect the intermediate pipeline (26) with the independent channel. A hollow connecting pipe (264) with heat-conducting walls is vertically inserted into the upper distribution plate (261) and the lower distribution plate (262). The upper port of the connecting pipe (264) opens into the upper distribution plate (261), and the lower port of the connecting pipe (264) opens into the lower distribution plate (262) and is located around the through hole (263). The shell-side inlet (22a) is located above the upper distribution plate (261).
5. The wound tube heat exchanger according to claim 4, characterized in that: There are multiple connecting pipes (264), which are arranged at intervals on the upper and lower distribution plates.
6. The wound tube heat exchanger according to claim 3, characterized in that: The shell side (22) is provided with an annular tube that is hollow inside and forms the intermediate pipeline (26). The annular tube is located circumferentially on the outer periphery of the upper end of the central cylinder (20) and is connected to the central cylinder (20) and the shell side gas phase outlet (22c).
7. The wound tube heat exchanger according to any one of claims 1 to 6, characterized in that: The central cylinder (20) is provided with a plurality of fins (201) spaced vertically along its inner edge, and each fin (201) extends obliquely upward from the inner wall surface of the central cylinder (20).
8. The wound tube heat exchanger according to claim 7, characterized in that: A leakage hole (202) is provided at the connection between the fin (201) and the inner wall of the central cylinder (20).
9. The wound tube heat exchanger according to claim 7, characterized in that: The fins (201) are positioned relatively close to the lower end of the central cylinder (20).
10. The wound tube heat exchanger according to any one of claims 1 to 6, characterized in that: The wall of the central cylinder (20) is a heat-conducting wall.