Wound tube type heat exchanger with self-flushing function

Abstract

The coiled tube type heat exchanger with the self-flushing function comprises a shell, tube plates are arranged at the two ends of the shell, a central tube is connected between the two tube plates, the two ends of a plurality of heat exchange tubes are connected to the tube plates in a penetrating mode and then wound on the central tube, at least one set of flushing mechanism is arranged, each set of flushing mechanism comprises two flushing connecting tubes, and the flushing connecting tubes are connected with the central tube in a penetrating mode. The two flushing connecting pipes are installed on the upper portion and the lower portion of the shell in a penetrating mode respectively, the ends, located outside the shell, of the flushing connecting pipes are connected with flushing pipe connectors, flushing pipe plates are installed in the flushing connecting pipes, a plurality of flushing pipes are connected between the upper flushing pipe connector and the lower flushing pipe connector, and a plurality of flushing holes are formed in the pipe walls of the flushing pipes. And the flushing pipe is spirally wound around the central pipe. According to the coiled tube type heat exchanger with the self-flushing function, the shell pass can be conveniently flushed and cleaned.

Description

Technical Field

[0001] The utility model relates to a coiled tube heat exchanger, in fact, to a coiled tube heat exchanger capable of flushing and self-cleaning the shell side, belonging to the technical field of coiled tube heat exchangers. Background Art

[0002] At present, tubular heat exchangers are commonly used heat exchange equipment in the chemical, food and other industries. They achieve heat exchange through heat conduction of cold and hot media. During use, the precipitation of impurities in the medium (such as scale) will cause blockage in the tube side and shell side. Nowadays, the "shell and tube heat exchanger with built-in sliding cleaner backwashing" as disclosed in China CN1796923B is used in shell and tube heat exchangers, which can achieve the cleaning of the tube side. However, for the wound tube type, since multiple layers of heat exchange tubes are wound in the shell side cavity, there are many inconveniences in cleaning the inner wall of the shell side cavity and the outer wall of the heat exchange tube. It is necessary to shut down and inject the cleaning solvent into the shell cavity to wait for it to dissolve the impurities. It is impossible to use flushing to quickly clean it, and there are dead corners for flushing. For this reason, our company adds a self-flushing structure in the process of manufacturing the wound tube heat exchanger to solve the above problems. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a coiled tube heat exchanger with a self-flushing function.

[0004] The purpose of the utility model is achieved in this way:

[0005] A coil-wound heat exchanger with a self-flushing function comprises a shell, tube sheets are arranged at both ends of the shell, a central tube is connected between the two tube sheets, both ends of a plurality of heat exchange tubes are connected to the tube sheets and then wound around the central tube, at least one group of flushing mechanisms is provided, each group of flushing mechanisms comprises two flushing pipes, the two flushing pipes are respectively connected and installed at the upper and lower parts of the shell, a flushing pipe joint is connected to one end of the flushing pipe outside the shell, a flushing tube sheet is installed in the flushing pipe, a plurality of flushing pipes are connected between the upper and lower flushing pipe joints, a plurality of flushing holes are opened on the pipe wall of the flushing pipe, and the flushing pipe is spirally wound around the central tube.

[0006] Preferably, both ends of the flushing pipe are respectively plugged into two flushing tube plates located at the upper and lower parts, the flushing pipe and the heat exchange tube are synchronously wound around the central tube, and at least one flushing pipe is wound in each layer of the heat exchange tube winding.

[0007] Preferably, the flushing pipes between two adjacent layers of heat exchange tube windings are arranged alternately.

[0008] Preferably, the flushing holes are evenly spaced along the outer wall of the flushing tube.

[0009] Preferably, the flushing holes are arranged in a spiral shape around the outer wall of the flushing tube.

[0010] Preferably, the flushing holes are arranged in multiple rows along the axial direction, and the multiple rows of flushing holes are evenly distributed around the central axis of the flushing tube.

[0011] Preferably, the flushing hole is a tapered hole, the large end of the tapered hole is located on the outer tube wall of the flushing tube, and the small end of the tapered hole is located on the inner tube wall of the flushing tube.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model realizes the cleaning inside the shell by adding a flushing pipe, and the flushing pipe and the heat exchange tube are synchronously wound, which not only does not change the original preparation process of the coiled tube heat exchanger, but also does not need to add additional cleaning devices. The synchronous winding can not only conveniently flush and clean the inner wall of the shell, but also enables the flushing pipe to comprehensively flush and clean all parts of each heat exchange tube on each layer, thereby ensuring the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a schematic diagram of a coiled tube heat exchanger with a self-flushing function.

[0015] Figure 2 It is a schematic diagram of the heat exchange tube and the flushing tube in the utility model.

[0016] Figure 3 It is a schematic diagram of the partial structure of the flushing pipe in the utility model.

[0017] Figure 4 For this utility model Figure 3 AA section view in.

[0018] in:

[0019] Shell 1, tube sheet 2, pipe joint 3, shell side medium joint 4, flushing pipe 5, flushing tube sheet 6, flushing pipe joint 7, flushing pipe 8;

[0020] Sewage outlet 1.1;

[0021] Central tube 2.1;

[0022] Flush hole 8.1. DETAILED DESCRIPTION

[0023] See also Figures 1 to 4The utility model relates to a coil-wound heat exchanger with a self-flushing function, comprising a shell 1, wherein the upper and lower side walls of the shell 1 are provided with shell-side medium joints 4, a sewage outlet 1.1 is provided on the lower shell wall of the shell 1, tube sheets 2 are provided at both ends of the shell 1, and a central tube 2.1 is connected between the two tube sheets 2, and the two ends of the heat exchange tube are connected to the tube sheet 2 and then wound around the central tube 2.1, and the tube sheet 2 is connected with a pipe joint 3;

[0024] At least one set of flushing mechanisms is provided at the upper and lower parts of the shell 1, and each set of flushing mechanisms includes two flushing pipes 5, which are respectively installed on the upper and lower parts of the shell 1. A flushing pipe joint 7 is connected to one end of the flushing pipe 5 located outside the shell 1, and a flushing tube sheet 6 is installed in the flushing pipe 5. A plurality of flushing pipes 8 are connected between the upper and lower flushing pipe joints 7, that is, the two ends of the flushing pipe 8 are respectively plugged into the two flushing tube sheets 6 located at the upper and lower parts, the flushing pipe 8 is wound between the heat exchange tubes, and a plurality of flushing holes 8.1 are opened on the outer wall of the flushing pipe 8.

[0025] Furthermore, the flushing pipe 8 and the heat exchange tube are synchronously wound around the central tube 2.1. During the winding process, it is ensured that at least one flushing pipe 8 is synchronously wound in each layer of heat exchange tube, and the flushing pipes 8 between the inner and outer adjacent layers are staggered, so that the flushing of the outer wall of the heat exchange tube in the adjacent layer is more thorough.

[0026] Furthermore, in the winding process of the heat exchange tube and the flushing tube 8: while the heat exchange tube is wound around the central tube 2.1 from the inside to the outside in multiple layers, generally several heat exchange tubes are spirally wound on the central tube 2.1 to form a layer of heat exchange tube winding, and each group of heat exchange tube windings are coaxially arranged until the entire chamber of the shell 1 is filled. In the process of winding the heat exchange tube to form each group of heat exchange tube windings, at least one flushing tube 8 in each group of heat exchange tube windings is synchronously spirally wound with the surrounding tube, that is, at this time, the flushing tube 8 and the surrounding tube of the spiral structure constituting the group of heat exchange tube windings are located in the same cylindrical structure of the heat exchange surface. At this time, the surrounding heat exchange tubes can be flushed and self-cleaned through the flushing holes 8.1 of the flushing tube 8. Preferably, the gap between adjacent flushing holes 8.1 is controlled and the flushing holes 8.1 are made The flushing holes 8.1 are arranged in a spiral shape around the outer wall of the flushing tube 8, or the flushing holes 8.1 are arranged in multiple rows along the axial direction, and the multiple rows of flushing holes 8.1 are evenly distributed in a circle around the central axis of the flushing tube 8 (as shown in the figure, the flushing holes 8.1 are arranged in three rows, and the three rows of flushing holes 8.1 are arranged in a circle at 120° to each other, so as to maximize the flushing effect in all directions), so that the multiple flushing holes 8.1 can not only flush the heat exchange tubes in the heat exchange surface, but also flush the heat exchange tubes in the upper and lower adjacent heat exchange surfaces; further, the flushing hole 8.1 is a tapered hole, the large end of which is located on the outer tube wall of the flushing tube 8, and the small end is located on the inner tube wall of the flushing tube 8, so that it has a larger flushing angle when flushing. For the flushing tube 8 in the outermost layer of the heat exchange tube winding, the inner wall of the shell 1 can be flushed and cleaned.

[0027] During flushing, the flushing liquid is introduced through the flushing pipe joints 7 located at both ends and distributed to each flushing tube 8 through the flushing tube plate 6. After the outer wall of the heat exchange tube and the inner wall of the shell 1 are flushed through the flushing hole 8.1, the remaining flushing liquid is discharged through the flushing tube plate 6 and the flushing pipe joints 7 located at the upper part for circulating flushing, and the cleaning liquid sprayed through the flushing hole 8.1 and the impurities and sewage flushed and dissolved are discharged through the sewage outlet 1.1 located below, thereby realizing the entire self-cleaning process.

[0028] In addition: It should be noted that the above specific implementation is only an optimization scheme of this patent. Any changes or improvements made by technicians in this field based on the above concept are within the scope of protection of this patent.

Claims

1. A coiled tube heat exchanger with a self-flushing function, comprising a shell (1), tube sheets (2) being provided at both ends of the shell (1), a central tube (2.1) being connected between the two tube sheets (2), and multiple heat exchange tubes having both ends connected to the tube sheets (2) and then wound around the central tube (2.1), characterized in that: At least one group of flushing mechanisms is provided, and each group of flushing mechanisms comprises two flushing pipes (5), the two flushing pipes (5) are respectively connected and installed on the upper and lower parts of the shell (1), one end of the flushing pipe (5) located outside the shell (1) is connected to a flushing pipe joint (7), and a flushing pipe plate (6) is installed in the flushing pipe (5), a plurality of flushing pipes (8) are connected between the upper and lower flushing pipe joints (7), a plurality of flushing holes (8.1) are opened on the pipe wall of the flushing pipe (8), and the flushing pipe (8) is spirally wound around the central pipe (2.1).

2. A coiled tube heat exchanger with self-flushing function according to claim 1, characterized in that: The two ends of the flushing pipe (8) are respectively plugged into two flushing tube plates (6) located at the upper and lower parts. The flushing pipe (8) and the heat exchange tube are synchronously wound around the central tube (2.1), and at least one flushing pipe (8) is wound in each layer of the heat exchange tube winding.

3. A coiled tube heat exchanger with self-flushing function according to claim 2, characterized in that: Flushing pipes (8) between two adjacent layers of heat exchange tube windings are arranged in a staggered manner.

4. A coiled tube heat exchanger with self-flushing function according to claim 2 or 3, characterized in that: The flushing holes (8.1) are evenly spaced along the outer wall of the flushing pipe (8).

5. A coiled heat exchanger with self-flushing function according to claim 2 or 3, characterized in that: The flushing holes (8.1) are arranged in a spiral shape around the outer wall of the flushing tube (8).

6. A coiled heat exchanger with self-flushing function according to claim 2 or 3, characterized in that: The flushing holes (8.1) are arranged in a plurality of rows along the axial direction thereof, and the plurality of rows of flushing holes (8.1) are evenly distributed around the central axis of the flushing pipe (8).

7. A coiled heat exchanger with self-flushing function according to claim 2 or 3, characterized in that: The flushing hole (8.1) is a tapered hole, the large end of which is located on the outer wall of the flushing tube (8), and the small end of which is located on the inner wall of the flushing tube (8).

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