A wound tube heat exchanger

Abstract

A wound tube heat exchanger includes: a shell, on which a tube-side inlet pipe and a tube-side outlet pipe are provided; a heat exchange tube, which is arranged in the shell, and the input end of the heat exchange tube is connected to the tube-side inlet pipe, and the output end of the heat exchange tube is connected to the tube-side outlet pipe; the shell is also provided with a cleaning liquid inlet pipe; and also includes: a capillary tube, the liquid inlet hole on the first end of which is connected to the cleaning liquid inlet pipe, and the second end with the liquid outlet hole is inserted into the heat exchange tube along the length direction, and the outer peripheral wall of the capillary tube located in the heat exchange tube is spaced opposite to the inner peripheral wall of the corresponding heat exchange tube to form an annular cavity. Compared with the prior art, the utility model can remove scale online and avoid blockage of the heat exchange tube.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchangers, and in particular relates to a wound tube heat exchanger. Background Art

[0002] In order to avoid the deposition of heat exchange medium and affect the heat exchange efficiency, the applicant has designed a wound tube heat exchanger with a cleaning tube, such as the structure disclosed in the utility model patent "A wound tube heat exchanger with a cleaning tube" (authorization announcement number CN216132321U) with patent number 202121752973.2, which includes a shell, a heat exchange tube, and a cleaning tube. The shell is cylindrical and is provided with a first tube sheet and two second tube sheets. The heat exchange tube is axially arranged in the shell and spirally wound from the inside to the outside to form a multi-layer spiral tube. The heat exchange tube has a first winding section, a first closing section, and a first uniform section; both ends of the heat exchange tube are supported on the two second tube sheets; the cleaning tube is axially arranged in the shell and spirally wound in each layer of spiral tubes, and the first end of the cleaning tube passes through and is supported on the first tube sheet for the cleaning medium to flow in; a plurality of groups of liquid outlet holes are opened on the tube wall of the cleaning tube opposite to the first uniform section of the heat exchange tube. When the heat exchanger needs to be cleaned, the cleaning medium is input into the cleaning tube, and the cleaning medium is sprayed out from the liquid outlet under pressure to flush the crystallized substances or impurities on the first uniform section of the heat exchange tube opposite to the liquid outlet, thereby facilitating the removal of crystallized substances or impurities between the layers of heat exchange tubes, ensuring the safe, stable and long-term continuous operation of the heat exchanger.

[0003] The above patent can effectively clean the crystallized substances or impurities between adjacent heat exchange tubes. However, under certain working conditions, crystallized substances or impurities may also exist inside the heat exchange tubes. If these crystallized substances or impurities are not cleaned in time, they will clog the heat exchange tubes, thereby affecting the heat exchange work. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a wound tube heat exchanger in view of the current status of the prior art, so as to be able to remove scale online and avoid clogging of the heat exchange tubes.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: a wound tube heat exchanger, comprising:

[0006] A shell body, on which a pipe-pass inlet pipe and a pipe-pass outlet pipe are provided;

[0007] The heat exchange tube is arranged in the shell, and the input end of the heat exchange tube is connected to the tube inlet pipe, and the output end of the heat exchange tube is connected to the tube outlet pipe;

[0008] Features:

[0009] The housing is also provided with a cleaning liquid inlet pipe;

[0010] Also included are:

[0011] The capillary tube has a liquid inlet hole on its first end that is connected to the cleaning liquid inlet pipe, and a second end with a liquid outlet hole that is inserted into the heat exchange tube along the length direction, and the outer peripheral wall of the capillary tube in the heat exchange tube is spaced opposite to the inner peripheral wall of the corresponding heat exchange tube to form an annular cavity.

[0012] In this way, the cleaning liquid is transported into the capillary tube through the cleaning liquid inlet pipe, and then sprayed out from the liquid outlet hole at the second end of the capillary tube. The sprayed cleaning liquid can clean the inner wall of the heat exchange tube to avoid blockage of the heat exchange tube. Moreover, since the outer peripheral wall of the capillary tube and the inner peripheral wall of the heat exchange tube are spaced apart from each other to form an annular cavity, the annular cavity allows the tube side medium to pass through, so that the design of the capillary tube in the utility model can realize online descaling without affecting the normal use of the heat exchange tube.

[0013] Preferably, the outer peripheral wall of the capillary tube in the heat exchange tube is provided with positioning protrusions at intervals along the circumferential direction, and the end of each positioning protrusion is opposite to, adjacent to or in contact with the inner peripheral wall of the corresponding heat exchange tube. The design of the positioning protrusions allows the outer peripheral wall of the capillary tube to always be opposite to the inner peripheral wall of the heat exchange tube at intervals, thereby preventing the capillary tube from being in contact with the heat exchange tube.

[0014] Preferably, the positioning protrusions arranged at intervals in the circumferential direction form a group of positioning members, and there are at least two groups of positioning members which are arranged at intervals along the length direction of the capillary.

[0015] In the above schemes, preferably, the second end of the capillary is relatively close to the output end of the heat exchange tube and relatively far from the input end of the heat exchange tube. In some working conditions, such as the production of ethylene oxide / ethylene glycol (EO / EG), there is a situation where oligomers are polymerized near the output end of the heat exchange tube. The capillary arranged near the output end of the heat exchange tube in the utility model can avoid the polymerization of oligomers.

[0016] Preferably, the second end of the capillary tube is inserted into the heat exchange tube from the output end of the heat exchange tube, and the first end of the capillary tube is located outside the heat exchange tube.

[0017] Preferably, there are multiple capillaries and heat exchange tubes, the liquid inlet hole on the first end of each capillary is connected to the cleaning liquid inlet pipe, and the second end of each capillary is respectively inserted into the corresponding heat exchange tube.

[0018] In order to transport the cleaning liquid to each capillary, it further includes an annular liquid collecting pipe, which has a liquid input hole connected to the cleaning liquid inlet pipe and has liquid output holes arranged at intervals along the circumferential direction. Each liquid output hole is opposite to and connected to the liquid inlet hole of the corresponding capillary.

[0019] Preferably, the collecting pipe comprises at least two inner and outer annular tube units, adjacent annular tube units are connected by a radially extending intermediate tube, and each annular tube unit has the above-mentioned liquid output holes arranged at intervals along the circumferential direction, and the outermost annular tube unit has the above-mentioned liquid input hole. The number of annular tube units can be determined according to the number of heat exchange tubes. For example, if the number of heat exchange tubes is large, three, four or even more annular tube units can be selected, and if the number of heat exchange tubes is small, one or two annular tube units can be selected.

[0020] Preferably, there are at least two intermediate tubes between adjacent annular tube units, and the intermediate tubes are spaced apart in the circumferential direction.

[0021] Preferably, a first tube sheet is provided in the shell to divide the internal space of the shell into a first chamber and a second chamber, the heat exchange tube is provided in the first chamber, and the output end of the heat exchange tube is supported on the first tube sheet and communicated with the second chamber, and the wall of the second chamber is provided with the above-mentioned tube outlet pipe and cleaning liquid inlet pipe;

[0022] The liquid collecting pipe is arranged in the second chamber.

[0023] Compared with the prior art, the utility model has the following advantages: by providing a cleaning liquid inlet pipe and a capillary, the liquid inlet hole on the first end of the capillary is connected to the cleaning liquid inlet pipe, and the second end of the capillary with the liquid outlet hole is inserted into the heat exchange tube along the length direction, so that the cleaning liquid is transported to the capillary through the cleaning liquid inlet pipe, and then sprayed out from the liquid outlet hole at the second end of the capillary, and the sprayed cleaning liquid can clean the inner wall of the heat exchange tube to avoid clogging of the heat exchange tube; and because the outer peripheral wall of the capillary is spaced relative to the inner peripheral wall of the heat exchange tube to form an annular cavity, the annular cavity allows the tube side medium to pass, so that the design of the capillary in the utility model can achieve online descaling without affecting the normal use of the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a partial structural schematic diagram of the first embodiment of the utility model;

[0025] Figure 2 for Figure 1 A magnified view of the local structure;

[0026] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0027] Figure 4 for Figure 3 Schematic diagram of the structure of the capillary tube and the heat exchange tube in the direction of A;

[0028] Figure 5 This is a schematic diagram of the structure of the liquid collecting pipe in the first embodiment of the utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the liquid collecting pipe in the second embodiment of the utility model;

[0030] Figure 7 It is a schematic diagram of the structure of the liquid collecting pipe in the third embodiment of the present utility model. DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] Embodiment 1:

[0033] like Figures 1 to 5 As shown, a preferred embodiment 1 of a wound tube heat exchanger of the utility model is shown. The wound tube heat exchanger includes a shell 100 , a heat exchange tube 200 , a capillary tube 210 and a liquid collecting tube 300 .

[0034] The shell 100 includes a shell-side cylinder 150 which is vertically arranged and has a first chamber 101 therein. The lower end of the shell-side cylinder 150 is provided with a first tube sheet 140 and a first pipe box 141 with a second chamber 102. The side wall of the first pipe box 141 is provided with a cleaning liquid inlet pipe 130, and the bottom of the first pipe box 141 is provided with a pipe-side outlet pipe 120. The upper end of the shell-side cylinder 150 is provided with a second tube sheet 160 and a second pipe box 161, and the top of the second pipe box 161 is provided with a pipe-side inlet pipe 110.

[0035] A plurality of heat exchange tubes 200 are axially arranged in the shell-side cylinder 150 , and the upper end (i.e., the input end) of each heat exchange tube 200 is supported on the second tube sheet 160 and connected to the tube-side inlet pipe 110 , and the lower end (i.e., the output end) of each heat exchange tube 200 is supported on the first tube sheet 140 and connected to the tube-side outlet pipe 120 .

[0036] The number of the capillary tubes 210 is consistent with the number of the heat exchange tubes 200. Each capillary tube 210 has a first end with a liquid inlet hole 211 and a second end with a liquid outlet hole 212. The second end of each capillary tube 210 is inserted upward from the output end of the corresponding heat exchange tube 200 into the heat exchange tube 200 (the second end of the capillary tube 210 is relatively close to the output end of the heat exchange tube 200 and relatively far away from the input end of the heat exchange tube 200). The first end of each capillary tube 210 faces downward and is located outside the heat exchange tube 200 and inside the first tube box 141. At the same time, positioning protrusions 213 are provided at intervals along the circumferential direction on the outer peripheral wall of the capillary tube 210 located in the heat exchange tube 200, and the end of each positioning protrusion 213 is opposite to, adjacent to or in contact with the inner peripheral wall of the corresponding heat exchange tube 200. The positioning protrusions 213 arranged at intervals in the circumferential direction form a group of positioning members, and there are at least two groups of positioning members that are arranged at intervals along the length direction of the capillary 210. The positioning members are designed so that the outer circumferential wall of the capillary 210 located in the heat exchange tube 200 is spaced opposite to the inner circumferential wall of the corresponding heat exchange tube 200 to form an annular cavity 20, and the annular cavity 20 can allow the tube-side medium to pass through, so that the arrangement of the capillary 210 does not affect the normal operation of the heat exchange tube.

[0037] The above-mentioned collecting pipe 300 is annular and is horizontally placed in the first pipe box 141 and below the capillary 210. The collecting pipe 300 has a liquid input hole 310 opposite to and connected to the cleaning liquid inlet pipe 130, and has liquid output holes 320 arranged at intervals along the circumferential direction. Each liquid output hole 320 is opposite to and connected to the liquid inlet hole 211 of the corresponding capillary 210.

[0038] Thus, when the heat exchange tube 200 needs to be cleaned, the cleaning liquid is transported to the capillary tube 210 through the cleaning liquid inlet pipe 130, and then sprayed out from the liquid outlet 212 at the second end of the capillary tube. The sprayed cleaning liquid can clean the inner wall of the heat exchange tube 200 to prevent the heat exchange tube 200 from being blocked. The sprayed cleaning liquid can pass through the annular cavity 20 and then be output from the heat exchange tube 200.

[0039] Embodiment 2:

[0040] like Figure 6 As shown, it is a preferred embodiment 2 of a wound tube heat exchanger of the utility model, which is basically the same as the embodiment 1, except that in this embodiment, the liquid collecting pipe 300 includes two inner and outer ring tube units 30, and the adjacent ring tube units 30 are connected by radially extending intermediate pipes 31, and there are four intermediate pipes 31, which are arranged at equal intervals along the circumferential direction. At the same time, each ring tube unit 30 has a liquid output hole 320 arranged at intervals along the circumferential direction, and the outermost ring tube unit 30 has a liquid input hole 310.

[0041] Embodiment three:

[0042] like Figure 7As shown, it is a preferred embodiment 3 of a wound tube heat exchanger of the utility model. This embodiment is basically the same as the second embodiment, and the difference is that there are three annular tube units in this embodiment.

Claims

1. A wound tube heat exchanger, comprising: A shell (100) is provided with a pipe-side inlet pipe (110) and a pipe-side outlet pipe (120); The heat exchange tube (200) is arranged in the shell (100), and the input end of the heat exchange tube (200) is connected to the tube-side inlet pipe (110), and the output end of the heat exchange tube (200) is connected to the tube-side outlet pipe (120); Features: The housing (100) is also provided with a cleaning liquid inlet pipe (130); Also included are: The capillary tube (210) has a liquid inlet hole (211) on its first end that is in communication with the cleaning liquid inlet pipe (130), and a second end with a liquid outlet hole (212) that is inserted into the heat exchange tube (200) along the length direction, and the outer peripheral wall of the capillary tube (210) located in the heat exchange tube (200) is spaced apart from the inner peripheral wall of the corresponding heat exchange tube (200) to form an annular cavity (20).

2. The wound tube heat exchanger according to claim 1, characterized in that: Positioning protrusions (213) are arranged at intervals along the circumferential direction on the outer peripheral wall of the capillary tube (210) located in the heat exchange tube (200), and the end of each positioning protrusion (213) is opposite to, adjacent to or in contact with the inner peripheral wall of the corresponding heat exchange tube (200).

3. The wound tube heat exchanger according to claim 2, characterized in that: The positioning protrusions (213) arranged at intervals in the circumferential direction form a group of positioning members, and there are at least two groups of positioning members which are arranged at intervals along the length direction of the capillary (210).

4. The wound tube heat exchanger according to any one of claims 1 to 3, characterized in that: The second end of the capillary tube (210) is relatively close to the output end of the heat exchange tube (200).

5. The wound tube heat exchanger according to claim 4, characterized in that: The second end of the capillary tube (210) is inserted into the heat exchange tube (200) from the output end of the heat exchange tube (200), and the first end of the capillary tube (210) is located outside the heat exchange tube (200).

6. The wound tube heat exchanger according to claim 5, characterized in that: There are multiple capillaries (210) and heat exchange tubes (200), and the liquid inlet hole (211) on the first end of each capillary tube (210) is connected to the cleaning liquid inlet pipe (130), and the second end of each capillary tube (210) is respectively inserted into the corresponding heat exchange tube (200).

7. The wound tube heat exchanger according to claim 6, characterized in that: It also includes an annular liquid collecting pipe (300) having a liquid input hole (310) connected to the cleaning liquid inlet pipe (130) and liquid output holes (320) arranged at intervals along the circumferential direction, each liquid output hole (320) being opposite to and connected to the liquid inlet hole (211) of the corresponding capillary tube (210).

8. The wound tube heat exchanger according to claim 7, characterized in that: The liquid collecting pipe (300) comprises at least two annular tube units (30) arranged inside and outside each other, adjacent annular tube units (30) are connected via a radially extending intermediate tube (31), and each annular tube unit (30) has the above-mentioned liquid output holes (320) arranged at intervals in the circumferential direction, and the annular tube unit (30) located on the outermost side has the above-mentioned liquid input hole (310).

9. The wound tube heat exchanger according to claim 8, characterized in that: There are at least two intermediate tubes (31) between adjacent annular tube units (30), which are arranged at intervals in the circumferential direction.

10. The wound tube heat exchanger according to claim 7, characterized in that: A first tube sheet (140) is provided in the shell (100) to divide the internal space of the shell (100) into a first chamber (101) and a second chamber (102); the heat exchange tube (200) is provided in the first chamber (101), and the output end of the heat exchange tube (200) is supported on the first tube sheet (140) and communicated with the second chamber (102); the tube outlet pipe (120) and the cleaning liquid inlet pipe (130) are provided on the cavity wall of the second chamber (102); The liquid collecting pipe (300) is arranged in the second chamber (102).

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