Spiral plate heat exchanger

Abstract

A spiral plate type heat exchanger comprises a cylindrical shell, a spiral plate and a heat exchanger body. The spiral plates are arranged in the shell, the number of the spiral plates is at least two, the spiral plates are wound into at least a first spiral channel and a second spiral channel which are adjacent to each other from inside to outside clockwise or anticlockwise in the circumferential direction, and the first spiral channel and the second spiral channel extend in the axial direction of the shell; an inner port of the first spiral channel and an outer port of the second spiral channel are respectively used as inlets for inputting a first heat exchange medium and a second heat exchange medium; the input end of the gas pipeline is located outside the shell so that compressed gas can be input, and the output end of the gas pipeline is axially inserted into an inlet of at least one of the first spiral channel and the second spiral channel or the position close to the inlet so that the compressed gas can enter the corresponding spiral channel. The risk of blockage of the heat exchanger can be reduced, and the operation cycle of the device is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchangers, and particularly relates to a spiral plate heat exchanger. Background Art

[0002] The existing spiral plate heat exchangers are in the structures disclosed in the Chinese utility model patent "A Multi-stream Spiral Plate Heat Exchanger" with the patent number 202121863007.8 and the authorization announcement number CN215984131U, and the Chinese utility model patent "A Spiral Plate Heat Exchanger with a Sealing Structure" with the patent number 202120801664.3 and the authorization announcement number CN215373649U.

[0003] When the spiral plate heat exchanger is used to treat wastewater containing solid particles, such as coal coking gas-making wastewater, which has a high ammonia and nitrogen content, is rich in calcium, magnesium and other ions, has a high water hardness, is prone to salt formation during the cooling process, and contains solid particles of coke, the wastewater may block and corrode the heat exchanger during the heat exchange and cooling process. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a spiral plate heat exchanger according to the current situation of the prior art to reduce the risk of blockage.

[0005] The technical solution adopted by the utility model to solve the above technical problem is as follows: A spiral plate heat exchanger includes:

[0006] A shell, which is cylindrical;

[0007] A spiral plate, which is arranged in the shell, and there are at least two spiral plates that are wound from the inside to the outside in the clockwise or counterclockwise direction along the circumference to form at least adjacent first and second spiral channels. The first and second spiral channels both extend along the axial direction of the shell; and the inner port of the first spiral channel and the outer port of the second spiral channel are respectively used as the inlets for the first heat exchange medium and the second heat exchange medium to enter, and the outer port of the first spiral channel and the inner port of the second spiral channel are respectively used as the outlets for the first heat exchange medium and the second heat exchange medium to exit.

[0008] It is characterized by further including:

[0009] A gas pipeline, whose input end is located outside the shell for compressed gas to enter, and whose output end is axially inserted into the inlet of at least one of the first and second spiral channels or a position adjacent to the inlet for compressed gas to enter the corresponding spiral channel.

[0010] In this way, when normal heat exchange occurs, the first heat exchange medium enters the first spiral channel, and the second heat exchange medium enters the second spiral channel, and the two exchange heat.

[0011] When the heat exchanger needs to be cleaned, the heat exchange medium is mixed with the compressed gas and then enters the corresponding spiral channel to flush the spiral channel and reduce the risk of blockage of the spiral channel.

[0012] Therefore, the utility model can realize waste water heat exchange treatment and at the same time reduce the risk of blockage of the heat exchanger.

[0013] Preferably, when the first heat exchange medium is a heat medium and the second heat exchange medium is a cold medium, the output end of the gas pipeline is axially inserted into the inner port of the first spiral channel or a position adjacent to the inner port.

[0014] Particulate matter may be generated during the cooling process of the heat medium, blocking the first spiral channel. The setting of the gas pipeline in the utility model can reduce the risk of blockage of the first spiral channel.

[0015] Preferably, it further includes:

[0016] A central cylinder, axially arranged inside the housing for each spiral plate to be arranged on its periphery;

[0017] A partition member, arranged inside the central cylinder, divides the internal space of the central cylinder into at least two independent first space and second space in the circumferential direction, and both the first space and the second space extend along the axial direction of the central cylinder. The first space and the second space are respectively communicated with the inner ports of the corresponding first spiral channel and second spiral channel;

[0018] The output end of the gas pipeline is axially inserted into the inner port of the first spiral channel; or, the output end of the gas pipeline is axially inserted into the first space.

[0019] To enable better mixing of the compressed gas and the heat exchange medium, preferably, when the output end of the gas pipeline is axially inserted into the inner port of the first spiral channel, a plurality of air holes are arranged at intervals along the length direction of the part of the gas pipeline located in the first spiral channel;

[0020] Or, when the output end of the gas pipeline is axially inserted into the first space, a plurality of air holes are arranged at intervals along the length direction of the part of the gas pipeline located in the first space.

[0021] Thus, the gas can be evenly output from each air hole and mixed with the heat exchange medium.

[0022] Furthermore, the diameter of a single air hole is A plurality of long circular holes are arranged at intervals along the axial direction on the side wall of the first space to communicate the first space with the first spiral channel.

[0023] Preferably, a single oblong hole extends along the circumferential direction of the first space, and the width of the single oblong hole in the axial direction is 15-40 mm and greater than the diameter of a single air outlet hole. The width of the single oblong hole in the axial direction can be any value between 15-40 mm, such as 15 mm, 20 mm, 30 mm, 40 mm, etc.

[0024] More preferably, the width of the single oblong hole in the axial direction is 25 mm.

[0025] The size of the oblong hole can simultaneously meet the flow rate of the heat exchange medium and the flow rate of the compressed gas. The size of the air outlet hole is smaller than that of the oblong hole, so that the gas can be accelerated and ejected when passing through the air outlet hole.

[0026] Furthermore, when the output end of the gas pipeline is axially inserted into the first space, each air outlet hole is respectively aligned with its corresponding oblong hole. This is beneficial for the gas to quickly enter the first spiral channel after passing through the oblong hole.

[0027] Furthermore, a tongue piece extending along the rolling direction of the spiral plate is convexly provided on the outer peripheral surface of the central cylinder for the inner end of the corresponding spiral plate to be connected thereto;

[0028] When the output end of the gas pipeline is axially inserted into the inner port of the first spiral channel, the part of the gas pipeline located in the first spiral channel is supported between the corresponding tongue piece and the outer peripheral surface of the central cylinder, and the orientation of each air outlet hole is consistent with the extending direction of the tongue piece.

[0029] In this way, after the gas is ejected from the air outlet hole, it can flow along the first spiral channel (i.e., the flow direction of the first heat exchange medium), which helps the smooth distribution of the mixed fluid of the gas and the first heat exchange medium and improves the anti-scaling performance.

[0030] Even further, the cross-section of the part of the gas pipeline located between the corresponding tongue piece and the outer peripheral surface of the central cylinder is in a semi-circular structure arched towards the rolling direction of the spiral plate, and the two ends of the semi-circular structure are respectively joined to the corresponding tongue piece and the outer peripheral surface of the central cylinder.

[0031] Thus, a cavity is enclosed between the semi-circular structure of the gas pipeline, the tongue piece and the outer peripheral surface of the central cylinder. The cross-sectional area of the cavity is relatively large, which can accommodate more compressed gas, and the compressed gas in the cavity enters the first spiral channel through the air outlet hole.

[0032] At the same time, the semi-circular structure of the gas pipeline has better stress-bearing capacity and can better withstand the deformation caused by external forces. And the two ends of the semi-circular structure contribute to the welding with the tongue piece and the central cylinder, thereby achieving joining.

[0033] In each of the above solutions, preferably, a valve for controlling the flow rate is provided on the gas pipeline.

[0034] Compared with the prior art, the advantages of the present utility model are as follows: When heat exchange is normal, the first heat exchange medium enters the first spiral channel, and the second heat exchange medium enters the second spiral channel, and the two exchange heat.

[0035] When the heat exchanger needs to be cleaned, the heat exchange medium is mixed with compressed gas and then enters the corresponding spiral channel to flush the spiral channel, reducing the risk of blockage of the spiral channel.

[0036] Therefore, the present utility model can realize heat exchange treatment of different media while reducing the risk of blockage of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic structural diagram of the first embodiment of the present utility model;

[0038] Figure 2 is Figure 1 a partial cross-sectional view taken along the line A-A in

[0039] Figure 3 is a schematic structural diagram of the central cylinder of the first embodiment of the present utility model;

[0040] Figure 4 is a schematic structural diagram of the second embodiment of the present utility model;

[0041] Figure 5 is a partial structural diagram of the central cylinder of the second embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The following further describes the present utility model in detail with reference to the embodiments of the drawings.

[0043] Embodiment 1:

[0044] As Figures 1 to 3 shown, it is a preferred first embodiment of a spiral plate heat exchanger of the present utility model. The spiral plate heat exchanger includes: a housing 11, a central cylinder 12, a partition member 13, a spiral plate 14, a first inlet nozzle 15, a first outlet nozzle 16, a second inlet nozzle 17, and a second outlet nozzle 18.

[0045] The housing 11 is cylindrical. The central cylinder 12 is axially disposed at the center inside the housing 11. The partition member 13 is plate-shaped and is disposed inside the central cylinder 12, dividing the internal space of the central cylinder 12 into independent first space 121 and second space 122 in the circumferential direction, and both the first space 121 and the second space 122 extend along the axial direction of the central cylinder 12. The spiral plate 14 is disposed inside the housing 11 and on the outer periphery of the central cylinder 12, and there are two spiral plates 14 which are wound from the inside to the outside in the clockwise or counterclockwise direction in the circumferential direction to form adjacent first spiral channels 141 and second spiral channels 142. The first spiral channel 141 and the second spiral channel 142 extend along the axial direction of the housing 11, and the inner ports of the first spiral channel 141 and the second spiral channel 142 are respectively communicated with the corresponding first space 121 and second space 122 (long circular holes 120 are axially spaced on the side wall of the first space 121 (please refer to Figure 3 ), to communicate the first space 121 with the first spiral channel 141. A single long circular hole 120 extends along the circumferential direction of the first space 121, and the width of a single long circular hole 120 in the axial direction is 25 mm. The communication mode between the second space 122 and the second spiral channel 142 also opens a hole on the side wall of the second space 122, and the specific details will not be elaborated). The above-mentioned first inlet nozzle 15 is disposed on the end face of the housing 11 corresponding to the first space 121 for inputting the first heat exchange medium. The first outlet nozzle 16 is disposed on the peripheral wall of the housing 11 corresponding to the outer port of the first spiral channel 141 for outputting the heat-exchanged first heat exchange medium. The second inlet nozzle 17 is disposed on the peripheral wall of the housing 11 corresponding to the outer port of the second spiral channel 142 for inputting the second heat exchange medium. The second outlet nozzle 18 is disposed on the end face of the housing 11 corresponding to the second space 122 for outputting the heat-exchanged second heat exchange medium. In this embodiment, the first heat exchange medium is a hot medium (such as coal coke gasification wastewater), and the second heat exchange medium is a cold medium (such as water).

[0046] The input end of the above-mentioned gas pipeline 3 is located outside the housing 11 for inputting compressed gas (such as air or nitrogen, etc.). One of the output ends of the gas pipeline 3 opens at the first inlet nozzle 15, and the other output end of the gas pipeline 3 is axially inserted at the inner port of the first spiral channel 141, and the part of the gas pipeline 3 located in the first spiral channel 141 is provided with air holes 30 at intervals along the length direction. The size of a single air hole 30 is (the size of the air hole 30 can be any value between 5 and 20 mm, such as 5 mm, 10 mm, 15 mm or 20 mm, etc.). Specifically, as Figure 2As shown, on the outer peripheral surface of the central cylinder 12, there is a convex tongue piece 123 extending along the winding direction of the spiral plate 14 for the inner end of the corresponding spiral plate 14 to be connected thereto; the cross-section of the part of the gas pipeline 3 located in the first spiral channel 141 is in a semi-circular structure arched towards the winding direction of the spiral plate 14, and both ends of the semi-circular structure are joined to the corresponding tongue piece 123 and the outer peripheral surface of the central cylinder 12 by welding to be supported between the corresponding tongue piece 123 and the outer peripheral surface of the central cylinder 12, and the orientation of each air outlet 30 is consistent with the extension direction of the tongue piece 123. In this way, a cavity 300 is enclosed between the semi-circular gas pipeline 3, the tongue piece 123 and the outer peripheral wall of the central cylinder 12. The cross-sectional area of the cavity 300 is relatively large, which can accommodate more compressed gas, and the compressed gas in the cavity 300 enters the first spiral channel 141 through the air outlet 30, which helps the smooth distribution of the mixed fluid of the gas and the first heat exchange medium and improves the anti-scaling performance. At the same time, the gas pipeline with a semi-circular structure has better stress-bearing capacity and can better withstand external forces to avoid deformation caused by the external forces. And both ends of the semi-circular structure contribute to the welding with the tongue piece 123 and the central cylinder 12, thus realizing the joining.

[0047] Meanwhile, in this embodiment, a valve 31 for controlling the flow rate is provided on the gas pipeline 3, and the valve 31 is located outside the housing 11. When the heat exchanger operates normally for heat exchange, the valve 31 is closed, and the first heat exchange medium exchanges heat with the second heat exchange medium. When the heat exchanger needs to be cleaned, the valve can be opened continuously or intermittently to flush the first spiral channel.

[0048] Embodiment 2:

[0049] As Figure 4 、 5 shown, it is a preferred Embodiment 2 of a spiral plate heat exchanger of the present utility model. This embodiment is basically the same as the embodiment, the difference being that in this embodiment, the output end of the gas pipeline 3 is axially inserted into the first space 121, and the part of the gas pipeline 3 located in the first space 121 is provided with air outlets 30 at intervals along the length direction. The size of a single air outlet 30 is (the size of the air outlet 30 can be any value between 5 and 20 mm, such as 5 mm, 10 mm, 15 mm or 20 mm, etc.), and the air outlets 30 are respectively directly opposite to their corresponding long circular holes 120. This is conducive to the gas quickly entering the first spiral channel 141 after passing through the long circular holes 120.

Claims

1. A spiral plate heat exchanger, comprising: A housing (11), in a cylindrical shape; Spiral plates (14), arranged inside the housing (11), and there are at least two of the spiral plates (14) which are wound from the inside to the outside in the clockwise or counterclockwise direction along the circumference to form at least adjacent first spiral channels (141) and second spiral channels (142). The first spiral channels (141) and the second spiral channels (142) both extend along the axial direction of the housing (11); and the inner port of the first spiral channel (141) and the outer port of the second spiral channel (142) are respectively used as the inlets for the first heat exchange medium and the second heat exchange medium to be input, and the outer port of the first spiral channel (141) and the inner port of the second spiral channel (142) are respectively used as the outlets for the first heat exchange medium and the second heat exchange medium to be output; It is characterized in that It further comprises: A gas pipeline (3), whose input end is located outside the housing (11) for compressed gas to be input, and whose output end is axially inserted into the inlet of at least one of the first and second spiral channels or a position adjacent to the inlet for compressed gas to enter the corresponding spiral channel.

2. The spiral plate heat exchanger according to claim 1, wherein: When the first heat exchange medium is a hot medium and the second heat exchange medium is a cold medium, the output end of the gas pipeline (3) is axially inserted into the inner port of the first spiral channel (141) or a position adjacent to the inner port.

3. The spiral plate heat exchanger according to claim 2, characterized in that: It further comprises: A central cylinder (12), axially arranged inside the housing (11) for each spiral plate (14) to be arranged on its periphery; A partition (13), arranged inside the central cylinder (12), dividing the internal space of the central cylinder (12) into at least independent first space (121) and second space (122) along the circumference, and both the first space (121) and the second space (122) extend along the axial direction of the central cylinder (12). The first space (121) and the second space (122) are respectively communicated with the inner ports of the corresponding first spiral channel (141) and second spiral channel (142); The output end of the gas pipeline (3) is axially inserted into the inner port of the first spiral channel (141); or, the output end of the gas pipeline (3) is axially inserted into the first space (121).

4. The spiral plate heat exchanger according to claim 3, wherein: When the output end of the gas pipeline (3) is axially inserted into the inner port of the first spiral channel (141), multiple air holes (30) are arranged at intervals along the length direction of the part of the gas pipeline (3) located in the first spiral channel (141); Or, when the output end of the gas pipeline (3) is axially inserted into the first space (121), multiple air holes (30) are arranged at intervals along the length direction of the part of the gas pipeline (3) located in the first space (121).

5. The spiral plate heat exchanger according to claim 4, characterized in that: The diameter of the single air outlet (30) is A plurality of long circular holes (120) are axially spaced on the side wall of the first space (121) to communicate the first space (121) with the first spiral channel (141).

6. The spiral plate heat exchanger according to claim 5, characterized in that: A single oblong hole (120) extends along the circumference of the first space (121), and the width of the single oblong hole (120) in the axial direction is 15 - 40 mm and is greater than the diameter of a single air hole (30).

7. The spiral plate heat exchanger according to claim 6, characterized in that: When inserted axially into the first space (121) at the output end of the gas pipeline (3), each air outlet hole (30) is respectively facing its corresponding oblong hole (120).

8. The spiral plate heat exchanger according to claim 4, wherein: On the outer peripheral surface of the central cylinder (12), there are convex tongues (123) extending along the winding direction of the spiral plate (14) for the inner ends of the corresponding spiral plates (14) to be connected thereto; When the output end of the gas pipeline (3) is inserted axially into the inner port of the first spiral channel (141), the part of the gas pipeline (3) located in the first spiral channel (141) is supported between the corresponding tongue (123) and the outer peripheral surface of the central cylinder (12), and the orientation of each air outlet hole (30) is consistent with the extending direction of the tongue (123).

9. The spiral plate heat exchanger according to claim 8, characterized in that: The cross-section of the part of the gas pipeline (3) located between the corresponding tongue (123) and the outer peripheral surface of the central cylinder (12) is in a semi-circular structure arched towards the winding direction of the spiral plate (14), and both ends of the semi-circular structure are respectively joined with the corresponding tongue (123) and the outer peripheral surface of the central cylinder (12).

10. The spiral plate heat exchanger according to any one of claims 1 to 9, characterized in that: A valve (31) for controlling the flow rate is provided on the gas pipeline (3).

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