Equal-flow-path pure-reverse-flow open type heat exchanger

Abstract

The invention relates to the field of heat exchangers, in particular to an equal-flow-path pure-reverse-flow open type heat exchanger which comprises a barrel-shaped shell, N circles of annular heat exchange plates are coaxially arranged in the shell, and the flow paths of the heat exchange plates are gradually increased from inside to outside in an equal-difference mode. Inner cavities of the heat exchange plates form heat exchange medium flow channels, and sewage flow channels are formed between the adjacent heat exchange plates. A separation welding line is horizontally arranged on the heat exchange plate and divides a heat exchange medium flow channel of the heat exchange plate into an upper heat exchange area and a lower heat exchange area which are equal in flow path, and the upper heat exchange area and the lower heat exchange area are each provided with a heat exchange medium inlet connector and a heat exchange medium outlet connector. And the heat exchange medium outlet joint of the upper heat exchange area in the ith circle of heat exchange plate is communicated with the heat exchange medium inlet joint of the lower heat exchange area in the (N + 1-i) th circle of heat exchange plate through a distribution pipe so as to form N groups of heat exchange medium channels with the same flow path. The inner-ring heat exchange plate and the outer-ring heat exchange plate which are distributed in a concentric circle mode are uniform in heat exchange, media in all the circles of heat exchange plates from inside to outside can flow in an equal flow path mode, heat of clean working media is fully utilized, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of heat exchangers, in particular to an equal flow path pure countercurrent open heat exchanger. Background Art

[0002] With the rapid development of heat exchanger technology, non-clean working fluid heat exchangers have been developed for special scenarios of non-clean working fluids such as crude oil chemical industry, textile, industrial wastewater containing solid particles, sewage / mud containing biomass, etc. The current traditional heat exchanger, as described in the publication number "CN106403397A", ​​includes an air inlet manifold, a liquid outlet manifold, and a plurality of heat exchange tubes connected between the air inlet manifold and the liquid outlet manifold. The multiple heat exchange tubes are arc-shaped and arranged at intervals in the radial direction. This type of annular heat exchange tube and plate structure has a heat exchange medium flow channel formed in the tube body or plate body for the clean working fluid to flow, and a non-clean working fluid flow channel is formed between adjacent heat exchange tubes.

[0003] Since the heat exchange tubes of traditional heat exchangers are designed in concentric circles, the flow path lengths of the clean working fluid in each circle are inconsistent and the fluid is unevenly distributed. During the heat exchange process, the clean working fluid in the inner circle heat exchange tubes is discharged from the heat exchanger before it is fully heat exchanged, while the clean working fluid in the outer circle heat exchange tubes has completed heat exchange with the unclean working fluid before being discharged from the heat exchanger. As a result, the clean working fluid in the second half of the outer circle heat exchange tubes cannot achieve any heat exchange effect at all, and the heat of the clean working fluid cannot be fully utilized. This problem needs to be solved urgently. Summary of the invention

[0004] In order to avoid and overcome the technical problems existing in the prior art, the present invention provides an equal flow path pure countercurrent open heat exchanger. The present invention makes the heat exchange of the inner circle heat exchange plate and the outer circle heat exchange plate distributed in concentric circles uniform, and the medium in each circle of heat exchange plates from the inside to the outside can form an equal flow path flow, so as to fully utilize the heat of the clean working medium and improve the heat exchange efficiency.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A pure countercurrent open heat exchanger with equal flow path, the heat exchanger comprises a barrel-shaped shell, N ring-shaped heat exchange plates are coaxially arranged in the shell, the flow path of each heat exchange plate increases arithmetically from the inside to the outside; the inner cavity of the heat exchange plate constitutes a heat exchange medium flow channel, and the sewage flow channel is formed between adjacent heat exchange plates; separation welding lines are horizontally arranged on the heat exchange plate, and the separation welding lines divide the heat exchange medium flow channel of the heat exchange plate into an upper heat exchange area and a lower heat exchange area with equal flow paths, and the upper heat exchange area and the lower heat exchange area are both provided with a heat exchange medium inlet joint and a heat exchange medium outlet joint; the heat exchange medium outlet joint of the upper heat exchange area in the i-th circle of heat exchange plates is connected with the heat exchange medium inlet joint of the lower heat exchange area in the N+1-i-th circle of heat exchange plates through a distribution pipe to form N groups of heat exchange medium channels with the same flow paths.

[0007] As a further solution of the present invention: the heat exchange medium inlet joints and the heat exchange medium outlet joints of the upper heat exchange zone and the lower heat exchange zone are both arranged at the bottom of the heat exchange plate, and the two ends of the separation weld line extend vertically downward to form a guide weld line, and the separation weld line cooperates with the guide weld line to form a U-shaped weld line with an opening downward, and the heat exchange plate is bounded by the U-shaped weld line, the inner side of the U-shaped weld line constitutes the lower heat exchange zone, and the outer side of the U-shaped weld line constitutes the upper heat exchange zone; the heat exchange medium inlet joints of the upper heat exchange zone and the lower heat exchange zone are symmetrically arranged on both sides of one of the guide weld lines, and the heat exchange medium outlet joints of the upper heat exchange zone and the lower heat exchange zone are symmetrically arranged on both sides of the other guide weld line; the upper heat exchange zone and the lower heat exchange zone are both provided with shunt weld lines at intervals along the vertical direction, and the shunt weld lines correspond to the vertical positions of each heat exchange medium inlet joint and the heat exchange medium outlet joint.

[0008] As a further solution of the present invention: the heat exchange plate is formed by bending a flat plate and then welding it to form an annular plate, the heat exchange plate includes two groups of plates whose edges are welded and fixed, the plate bodies of the two plates are welded and fixed by evenly arranged welding points, the plate cavity of the heat exchange plate is pressurized and expanded to form multiple groups of heat exchange medium flow cavities, each heat exchange medium flow cavity has four groups of welding points arranged in a diamond shape as boundary points, and the opening of the heat exchange medium flow cavity is formed between two adjacent groups of welding points of the upper and lower plates, and each opening of the heat exchange medium flow cavity is connected to an adjacent heat exchange medium flow cavity.

[0009] As a further solution of the present invention: the welding point is a circular welding point, and a spatial rectangular coordinate system is established with the center of the welding point as the origin. The plate arrangement direction of the heat exchange plate corresponds to the plane formed between the Z axis and the X axis in the spatial rectangular coordinate system. The spacing between two sets of welding points arranged in opposition to each other at a long distance in the heat exchange medium flow cavity is 2S. T The distance between the other two sets of welding points arranged in close opposition in the heat exchange medium flow cavity is 2S L , the maximum bulging height of the heat exchange medium flow cavity along the Y axis is δ; then in the spatial rectangular coordinate system, the contour coordinates of the heat exchange medium flow cavity on the Y axis are:

[0010]

[0011] As a further solution of the present invention: a heat exchange medium inlet pipe and a heat exchange medium outlet pipe are arranged on the shell, and the heat exchange medium inlet pipe transports the heat exchange medium to each upper heat exchange zone through the inlet branch pipe; the heat exchange medium outlet pipe receives the heat exchange medium discharged from each lower heat exchange zone through the outlet branch pipe, and the heat exchange medium inlet pipe, the heat exchange medium outlet pipe and the distribution pipe are all arranged in the tube bundle area of ​​the shell.

[0012] As a further solution of the present invention: the width of the weld line at the top edge of each heat exchange plate located in the inner circle is ≤2cm, the width of the weld line at the bottom of each heat exchange plate located in the inner circle is ≥6cm, and equalizing holes are evenly opened in the circumferential direction on the upper edge of the weld line at the bottom to connect the sewage flow channels on both sides of the heat exchange plate, and the aperture of each equalizing hole is ≥3cm.

[0013] As a further solution of the present invention: an exhaust hole is provided on the top of the upper heat exchange zone, and a ventilation hole is opened on the dividing weld line to allow the gas in the lower heat exchange zone to enter the upper heat exchange zone; an overflow port for sewage to pass through is provided on the top of each heat exchange plate, and each overflow port corresponds to the height of the sewage outlet pipe on the shell, and an arc-shaped outlet is opened on the heat exchange plate located on the outermost circle, and the arc radius corresponds to the radius of the sewage outlet pipe, so as to directly connect the sewage outlet pipe.

[0014] As a further solution of the present invention: a sewage pipe box connected to the sewage inlet pipe is arranged at the bottom of the shell, and distribution holes corresponding to the positions of each sewage flow channel are opened on the sewage pipe box, and each distribution hole provides sewage to each sewage flow channel from bottom to top; a sewage outlet for discharging sewage to the outside is arranged at the bottom of the shell, and a sewage discharge joint is opened on the sewage pipe box outside the shell.

[0015] As a further solution of the present invention: the opening at the top of the shell is closed by a cover, one end of which is hingedly engaged with the shell to flip over the shell opening; a drive shaft is axially arranged in the shell, the drive shaft is driven to rotate by a drive motor, and the drive motor is detachably fixed to the cover through a motor seat.

[0016] As a further solution of the present invention: a cleaning rod arranged radially along the shell is fixed on the driving shaft, an installation gap is provided between the cover and the heat exchange plate for the cleaning rod to rotate, and vertically arranged brushes are arranged at intervals on the cleaning rod, and the brush surface of the brush contacts the plate surface of the corresponding heat exchange plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The equal flow path design of the heat exchange medium flow channel of the present invention ensures that when the heat exchange medium passes through the inside of the heat exchanger, the flow cross-sectional area and flow length of all heat exchange medium flow paths are exactly the same, thereby achieving uniform distribution of the heat exchange medium flow rate, and the overall flow path is pure countercurrent, thereby achieving full utilization of the heat of the clean working fluid, improving the heat exchange efficiency, and avoiding the influence of heat exchange on the inner and outer ring flow paths of the concentric circle design heat exchange tube being inconsistent.

[0019] 2. The present invention performs an expansion design on the heat exchange plate and obtains the optimal expansion profile of the heat exchange plate by calculation to maximize the heat exchange efficiency. While reducing the volume of the heat exchanger, it can ensure that the heat exchanger has a high heat exchange efficiency and is not prone to blockage inside the heat exchanger.

[0020] 3. The non-clean working fluid of the present invention is distributed to the sewage flow channel between adjacent heat exchange plates through the distribution holes of the sewage pipe box, flows from bottom to top and converges through the overflow port and then flows out from the sewage outlet pipe. The flow paths in the vertical direction are the same, forming a sewage flow path with equal flow paths to ensure uniform heat exchange.

[0021] 4. There are no pipeline obstacles between adjacent heat exchange plates of the present invention. The cleaning rod is driven by a motor to rotate, which will make the raw sewage have a concentric rotation angular velocity in the horizontal direction. On the one hand, this rotation increases the flow rate of the sewage itself and increases turbulent disturbance. On the other hand, the soft bristles on the brush group directly physically contact the heat exchange surface of the heat exchange plate to remove dirt and biofilm deposition that may be generated by long-term operation. The outer side of the plate always remains in a "brand new" state. While physically removing the biofilm or dirt deposited on the surface, the wall thermal resistance on the sewage side is made to 0, maintaining the heat exchange performance of the heat exchanger, and achieving the dual purposes of "preventive self-cleaning" and "non-clean side turbulence heat exchange enhancement". BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 It is a schematic diagram of the structure of the inner ring heat exchange plate after being spread out.

[0024] Figure 3 It is a schematic diagram of the structure of the outermost heat exchange plate after being spread out.

[0025] Figure 4 This is a schematic diagram of the flow path connection of the heat exchange plate in the present invention.

[0026] Figure 5 It is a partial cross-sectional view of the heat exchange plate in the present invention.

[0027] In the figure:

[0028] 1. Shell; 11. Heat exchange medium inlet pipe; 12. Heat exchange medium outlet pipe;

[0029] 13. Distribution pipe; 14. Sewage inlet pipe;

[0030] 141. Sewage pipe box; 142. Distribution hole; 143. Sewage connection; 15. Sewage outlet pipe;

[0031] 2. Capping; 3. Driving motor; 4. Driving shaft;

[0032] 6. heat exchange plate; 61. plate; 62. heat exchange medium flow cavity; 63. welding point;

[0033] 64. Heat exchange medium inlet joint; 65. Heat exchange medium outlet joint;

[0034] 66. Overflow port; 67. Exhaust hole; 68. Separation welding line;

[0035] 681, flow guide welding line; 682, flow diversion welding line; 683, upper heat exchange area; 684, lower heat exchange area;

[0036] 69. Flow equalizing hole. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figures 1 to 5 In an embodiment of the present invention, a pure countercurrent open heat exchanger with equal flow path is provided, wherein a shell 1 of the heat exchanger is a barrel-shaped structure with an opening at the top, and a sealing cover 2 is installed at the bottom opening.

[0039] The cover 2 is hingedly connected to the housing 1 through a hinge structure, so that the opening of the housing 1 can be closed by flipping and opening. A handle structure is provided on the cover 2 to facilitate manual opening and closing of the cover 2, and a motor base is installed on the crossbeam of the cover 2 to install a drive motor 3.

[0040] Multiple circles of heat exchange plates 6 are coaxially arranged in the shell 1, and a separation weld line 68 is opened in the horizontal direction on each heat exchange plate 6. The length of the separation weld line 68 is less than the length of the heat exchange plate 6 after it is unfolded, and there is a gap between the two ends of the weld line and the welds on both sides of the heat exchange plate 6. Two parallel guide weld lines 681 are vertically extended downward from both ends of the separation weld line 68. The two guide weld lines 681 cooperate with the separation weld line 68 to form a U-shaped weld line, which divides the heat exchange medium flow channel in the heat exchange plate 6 into two heat exchange areas. With the U-shaped weld line as the boundary, the inner circle of the U-shaped weld line is the lower heat exchange area 684, and the outer circle of the U-shaped weld line is the upper heat exchange area 683. The flow paths of the heat exchange medium flow channels in the upper heat exchange area 683 and the lower heat exchange area 684 are equal.

[0041] The heat exchange plate 6 is a hollow plate, which is bent and welded to form an annular plate. The heat exchange plate 6 includes two groups of plates 61, the edges of the two plates 61 are welded and fixed, and the two plates 61 are welded and fixed by evenly arranged welding points 63. After the two groups of plates 61 are pressurized, a bulging three-dimensional space is formed between each welding point 63. Specifically, the plate 61 is formed by laser or resistance welding after two metal plates are overlapped, and then the inlet and outlet pipes are connected, and the remaining edge of the plate is sealed again by laser or resistance welding, and finally, it is formed by hydraulic bulging.

[0042] The arrangement of the welding points 63 is to form a multi-row arrangement on the vertical plate surface of the plate 61, and the spacing between the welding points 63 in each row is equal, and the welding points 63 in two adjacent rows are arranged in a staggered manner in the vertical position. The heat exchange medium flow cavity 62 is formed between the four groups of diamond-shaped welding points 63. There are multiple groups of heat exchange medium flow cavities 62, and the heat exchange medium flow cavities 62 at non-edges have four openings, each of which is connected to the opening of the adjacent heat exchange medium flow cavity 62, so that the heat exchange medium can flow in the three-dimensional space bulging in the heat exchange plate 6. The welding points 63 are preferably annular welding points.

[0043] A spatial rectangular coordinate system is established with the center of the welding point 63 as the origin. The arrangement direction of the heat exchange plate 6 corresponds to the plane formed between the Z axis and the X axis in the spatial rectangular coordinate system. The distance between two groups of welding points 63 arranged in opposition to each other at a long distance in the heat exchange medium flow cavity 62 is 2S. T The distance between the other two groups of welding points 63 arranged in close opposition in the heat exchange medium flow cavity 62 is 2S. L , the maximum bulging height of the heat exchange medium flow cavity 62 along the Y axis is δ; then in the spatial rectangular coordinate system, the contour coordinates of the heat exchange medium flow cavity 62 on the Y axis are:

[0044]

[0045] An annular sewage flow channel is formed between adjacent heat exchange plates 6, and each circle of sewage flow channels is in a connected state. A driving motor 3 is provided on the cover 2, and the driving motor 3 controls the rotation of the driving shaft 4 through a reducer. The driving shaft 4 extends axially along the shell 1 into the shell 1. A cleaning rod is fixed on the driving shaft 4, and the rod body of the cleaning rod is arranged along the diameter direction of the shell 1. A brush corresponding to the height of the heat exchange plate is vertically arranged on the cleaning rod. Preferably, two groups of brushes are symmetrically arranged in each sewage flow channel. When the driving motor 3 drives the cleaning rod to rotate through the driving shaft 4, the brush surface of the brush fits the plate body of the heat exchange plate 6 on both sides of the brush, and the heat exchange plate 6 is brushed and cleaned.

[0046] A sewage pipe box 141 is provided at the bottom of the shell 1, and the sewage pipe box 141 is connected to the sewage inlet pipe 14. A plurality of distribution holes 142 are opened on the sewage pipe box 141. The number of the distribution holes 142 corresponds to the number of sewage flow channels. The distribution holes 142 are preferably rectangular holes. A sewage discharge joint 143 is also provided on the sewage pipe box 141, which is used to independently discharge the sludge in the sewage pipe box 141 after opening.

[0047] Each heat exchange plate 6 is provided with an overflow port 66 at the top. The shape of the overflow port 66 is not limited. The interface of the sewage outlet pipe 15 corresponds to the height of the overflow port 66 of the heat exchange plate 6. The sewage flowing from bottom to top for heat exchange passes through the overflow port 66 and is discharged outward along the sewage outlet pipe 15. The outer plate 61 of the heat exchange plate 6 located in the outermost circle is 0.3-0.5 mm thicker than the inner plate. A group of arc-shaped outlets are provided at the top of the heat exchange plate 6 in the outermost circle. The radius of the arc corresponds to the radius of the sewage outlet pipe 15, which is used to communicate with the sewage outlet pipe 15. An independent sewage outlet is provided at the bottom of the shell 1. When the heat exchanger is cleaned, the dirt or impurities generated by cleaning are directly discharged outward through the sewage outlet. Compared with the sewage inlet pipe 14, the sewage outlet pipe 15 should be larger in size, and its top should be 2-5 cm lower than the total height of the heat exchange plate 6. The arrangement height of the heat exchange medium inlet pipe 11 and the heat exchange medium outlet pipe 12 is preferably higher than the height of the sewage inlet pipe 14 and the sewage pipe box 141.

[0048] When the heat exchange plates 6 are laid flat, each upper heat exchange zone 683 is provided with an exhaust hole 67 at the top. The exhaust holes 67 of the upper heat exchange zones 683 of each heat exchange plate 6 located in the inner circle (all heat exchange plates except the outermost circle heat exchange plate) are arranged vertically to avoid position interference with the brushing trajectory of the brush. Exhaust holes 67 are arranged radially at the top of the outer side surface of the heat exchange plate 6 located in the outermost circle. One section of the separating weld line 68 is disconnected, and a small-sized weld ring is arranged at the disconnection point to form an air exchange hole, through which the gas in the lower heat exchange zone 684 is discharged into the upper heat exchange zone 683. The aperture of the air exchange hole is small, so the flow rate of the heat exchange medium exchanged between the lower heat exchange zone 684 and the upper heat exchange zone 683 through the air exchange hole is negligible. The position of the air exchange hole is preferably arranged 5 cm near the side weld of the heat exchange plate 6.

[0049] Except for the heat exchange plates 6 in the outermost circle, the spacing between the double-sided welding lines at the top of each heat exchange plate 6 in the inner circle and the top edge is ≤2cm, and the spacing between the double-sided welding lines at the bottom and the bottom edge is ≥6cm. A large number of flow-averaging holes 69 with a diameter ≥3cm are evenly distributed along the double-sided welding lines at the bottom in the circumferential direction at equal intervals, and the aperture of each flow-averaging hole 69 is ≥3cm.

[0050] The heat exchange medium inlet joints 64 of the upper heat exchange area 683 and the lower heat exchange area 684 are symmetrically arranged on both sides of one of the guide welding lines 681, and the heat exchange medium outlet joints 65 of the upper heat exchange area 683 and the lower heat exchange area 684 are symmetrically arranged on both sides of the other guide welding line 681. Diverter welding lines 682 are arranged at intervals in the upper heat exchange area 683 and the lower heat exchange area 684 along the vertical direction, and the diverter welding lines 682 correspond to the vertical positions of each heat exchange medium inlet joint 64 and the heat exchange medium outlet joint 65. The heat exchange medium of the upper heat exchange area 683 and the lower heat exchange area 684 is horizontally diverted by the diverter welding line 682, flows along the annular path, and is discharged through the heat exchange medium outlet joint 65.

[0051] From inside to outside, the flow paths of the heat exchange medium flow channels of each circle of heat exchange plates 6 increase equidistantly, and the two groups of heat exchange areas located in different circles are connected through the distribution pipe 13, thereby forming a heat exchange medium channel. The distribution pipe 13 has no limitation on the structure, and in this embodiment, it is formed by bending multiple sections of 90-degree bends.

[0052] The number of circles of the heat exchange plates 6 is not limited. When the heat exchange plates 6 have N circles, the heat exchange medium outlet joint 65 of one group of heat exchange zones in the i-th circle of heat exchange plates 6 is connected to the heat exchange medium inlet joint 64 of one group of heat exchange zones in the N+1-i-th circle of heat exchange plates 6 through the distribution pipe 13. The distribution pipes 13 are preferably arranged in parallel with each other.

[0053] In this embodiment, nine circles of heat exchange plates 6 are set as an example. The two groups of heat exchange areas of each circle of heat exchange plates 6 are respectively area A and area B. Area A represents the upper heat exchange area 683, and area B represents the lower heat exchange area 684. The two groups of heat exchange areas of each circle of heat exchange plates 6 are connected through nine groups of distribution pipes 13, thereby forming nine heat exchange medium channels with the same flow path. The specific connection method is as follows:

[0054] 1A-9B, 2A-8B, 3A-7B, 4A-6B, 5A-5B, 6A-4B, 7A-3B, 8A-2B, 9A-1B.

[0055] Among them, 1A-9B indicates that the upper heat exchange area 683 of the first circle of heat exchange plates 6 is connected to the lower heat exchange area 684 of the ninth circle of heat exchange plates 6 through the distribution pipe 13 from the inside to the outside. The heat exchange medium inlet joint 64 of the upper heat exchange area 683 of the first circle of heat exchange plates 6 is connected to the heat exchange medium inlet pipe 11 on the shell 1 through the inlet branch pipe, the heat exchange medium outlet joint 65 of the upper heat exchange area 683 of the first circle of heat exchange plates 6 is connected to the heat exchange medium inlet joint 64 of the lower heat exchange area 684 of the ninth circle of heat exchange plates 6 through the distribution pipe 13, and the heat exchange medium outlet joint 65 of the lower heat exchange area 684 of the ninth circle of heat exchange plates 6 is connected to the heat exchange medium outlet pipe 12 through the outlet branch pipe. The connections of the remaining pipelines correspond to the above connection methods, and so on.

[0056] On the basis of this embodiment, the heat exchange plate 6 can be evenly divided into two groups of half zones, which are separated by a vertical weld. The two half zones are semi-circular in structure and have equal flow paths. Each half zone is also evenly divided into an upper heat exchange zone 683 and a lower heat exchange zone 684, and an equal flow path heat exchange is formed through the distribution pipe 13. Further improvement can be to evenly divide the heat exchange plate 6 into multiple groups of zones along the vertical direction, and each zone is divided into a heat exchange zone 683 and a lower heat exchange zone 684, expand the number of heat exchange medium channels, and the number of distribution pipes 13 increases accordingly.

[0057] When the heat exchanger is started, the cover 2 is first turned over and opened, and clean water is injected into the heat exchange area of ​​each heat exchange plate 6 through the heat exchange medium inlet pipe 11 as the heat exchange medium. The clean water passes through the 1A-9B heat exchange medium channel. At this time, the exhaust holes 67 on the two groups of heat exchange areas 1A-9B are all opened. After the air in the 1A-9B heat exchange medium channel is completely emptied, the exhaust holes 67 on the two groups of heat exchange areas 1A-9B are closed. Similarly, the air in each heat exchange medium channel is completely emptied, the cover 2 is closed, the sewage inlet pipe 14 is opened, and after the liquid level is flush with the inspection hole 21, the drive motor 3 is driven to drive the sewage to rotate through the brush 51, and the accumulated dirt on the surface of the heat exchanger 6 is removed through physical contact to complete the start-up of the heat exchanger.

[0058] In the operating state, the sewage outside the heat exchanger enters the sewage channels of the heat exchanger through the distribution hole 142 of the sewage pipe box 141, and flows freely through the equalizing hole 69, so that the sewage level in the heat exchanger is balanced. When the driving motor 3 drives the brush to rotate, the raw sewage will have a concentric rotation speed in the horizontal direction. This rotation will produce two beneficial effects. On the one hand, the flow rate of the fluid itself increases, increasing turbulent disturbance. On the other hand, the soft bristles on the brush group directly physically contact the heat exchange surface of the heat exchange plate 6, removing the dirt and biofilm deposition that may be generated by long-term operation, and the outer side of the plate always maintains a "brand new" state.

[0059] When draining and inspecting, close the sewage outlet pipe 15, open the sewage outlet at the bottom of the heat exchanger and the sewage outlet joint 143 on the sewage pipe box 141, and the sewage flows out through the sewage outlet and the sewage outlet joint 143 under the action of gravity. After the sewage is drained, open the cover 2 and use a high-pressure water gun to wash from the top to the bottom to remove the accumulated dirt at the opening of the distribution hole 142 of the sewage pipe box 141. In addition, the sewage inlet pipe 14 and the sewage pipe box 141 can be directly cleaned with a high-pressure water gun. By cleaning with a water gun, dirt or impurities can be directly discharged from the sewage outlet.

[0060] Taking the Reynolds number as a variable, when the heat exchange medium, heat exchange velocity and flow rate are the same, the convective heat transfer coefficients of the annular heat exchange plate formed by bending the existing rectangular hollow heat exchange plate and the heat exchange plate 6 of the present invention are compared as shown in Table 1 below. It can be seen that when other working conditions are the same, the heat exchange efficiency of the heat exchange plate of the present invention is much higher than that of the traditional rectangular hollow heat exchange plate.

[0061] Table 1

[0062]

[0063] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0064] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

Claims

1. An equal flow path pure countercurrent open heat exchanger, characterized in that: The heat exchanger comprises a barrel-shaped shell (1), wherein N annular heat exchange plates (6) are coaxially arranged in the shell (1), and the flow path of each heat exchange plate (6) increases arithmetically from the inside to the outside; the inner cavity of the heat exchange plate (6) constitutes a heat exchange medium flow channel, and the adjacent heat exchange plates (6) constitute a sewage flow channel; a separation welding line (68) is horizontally arranged on the heat exchange plate (6), and the separation welding line (68) divides the heat exchange medium flow channel of the heat exchange plate (6) into an upper heat exchange area (683) and a lower heat exchange area (684) with equal flow paths. The zone (684), the upper heat exchange zone (683) and the lower heat exchange zone (684) are all provided with a heat exchange medium inlet joint (64) and a heat exchange medium outlet joint (65); the heat exchange medium outlet joint (65) of the upper heat exchange zone (683) in the i-th circle of heat exchange plates (6) is connected to the heat exchange medium inlet joint (64) of the lower heat exchange zone (684) in the N+1-i-th circle of heat exchange plates (6) through a distribution pipe (13) to form N groups of heat exchange medium channels with the same flow path.

2. The equal flow path pure countercurrent open heat exchanger according to claim 1, characterized in that: The heat exchange medium inlet joint (64) and the heat exchange medium outlet joint (65) of the upper heat exchange zone (683) and the lower heat exchange zone (684) are both arranged at the bottom of the heat exchange plate (6); the two ends of the separation weld line (68) extend vertically downward to form a guide weld line (681); the separation weld line (68) and the guide weld line (681) cooperate to form a U-shaped weld line with an opening downward; the heat exchange plate (6) is bounded by the U-shaped weld line; the inner side of the U-shaped weld line constitutes the lower heat exchange zone (684); the outer side of the U-shaped weld line constitutes the upper heat exchange zone (683); the upper heat exchange zone (683) The heat exchange medium inlet joint (64) of the lower heat exchange zone (684) is symmetrically arranged on both sides of one of the guide welding lines (681), and the heat exchange medium outlet joints (65) of the upper heat exchange zone (683) and the lower heat exchange zone (684) are symmetrically arranged on both sides of the other guide welding line (681); the upper heat exchange zone (683) and the lower heat exchange zone (684) are both provided with shunt welding lines (682) at intervals along the vertical direction, and the shunt welding lines (682) correspond to the vertical positions of the heat exchange medium inlet joints (64) and the heat exchange medium outlet joints (65).

3. The equal flow path pure countercurrent open heat exchanger according to claim 1, characterized in that: The heat exchange plate (6) is formed by bending a flat plate and then welding it to form an annular plate. The heat exchange plate (6) comprises two groups of plate sheets (61) whose edges are welded and fixed. The plate bodies of the two plate sheets (61) are welded and fixed by evenly arranged welding points (63). The plate cavity of the heat exchange plate (6) is pressurized and expanded to form multiple groups of heat exchange medium flow cavities (62). Each heat exchange medium flow cavity (62) has four groups of welding points (63) arranged in a diamond shape as boundary points. An opening of the heat exchange medium flow cavity (62) is formed between two adjacent groups of welding points (63) of the upper and lower plate sheets (61). Each opening of the heat exchange medium flow cavity (62) is connected to an adjacent heat exchange medium flow cavity (62).

4. The equal flow path pure countercurrent open heat exchanger according to claim 3, characterized in that: The welding point (63) is a circular welding point. A spatial rectangular coordinate system is established with the center of the welding point (63) as the origin. The plate surface arrangement direction of the heat exchange plate (6) corresponds to the plane formed between the Z axis and the X axis in the spatial rectangular coordinate system. The spacing between two groups of welding points (63) arranged in opposition to each other at a long distance in the heat exchange medium flow cavity (62) is 2S. T The distance between the other two groups of welding points (63) arranged in close opposition in the heat exchange medium flow cavity (62) is 2S. L , the maximum bulging height of the heat exchange medium flow cavity (62) along the Y-axis direction is δ; then in the spatial rectangular coordinate system, the contour coordinates of the heat exchange medium flow cavity (62) on the Y-axis are:

5. The equal flow path pure countercurrent open heat exchanger according to any one of claims 1 to 4, characterized in that: The shell (1) is provided with a heat exchange medium inlet pipe (11) and a heat exchange medium outlet pipe (12). The heat exchange medium inlet pipe (11) transports heat exchange medium to each upper heat exchange zone (683) through an inlet branch pipe; the heat exchange medium outlet pipe (12) receives heat exchange medium discharged from each lower heat exchange zone (684) through an outlet branch pipe. The heat exchange medium inlet pipe (11), the heat exchange medium outlet pipe (12) and the distribution pipe (13) are all arranged in the tube bundle area of ​​the shell (1).

6. The equal flow path pure countercurrent open heat exchanger according to any one of claims 1 to 4, characterized in that: The width of the weld line at the top edge of each heat exchange plate (6) located in the inner circle is ≤2 cm, and the width of the weld line at the bottom of each heat exchange plate (6) located in the inner circle is ≥6 cm, and equal flow holes (69) are evenly opened in the circumferential direction along the upper edge of the weld line at the bottom to connect the sewage flow channels on both sides of the heat exchange plate (6), and the aperture of each equal flow hole (69) is ≥3 cm.

7. The equal flow path pure countercurrent open heat exchanger according to any one of claims 2 to 4, characterized in that: An exhaust hole (67) is provided at the top of the upper heat exchange zone (683), and a ventilation hole is provided on the separation welding line (68) to allow gas in the lower heat exchange zone (684) to enter the upper heat exchange zone (683); an overflow port (66) is provided at the top of each heat exchange plate (6) for sewage to pass through, and each overflow port (66) corresponds in height to a sewage outlet pipe (15) on the shell (1); an arc-shaped outlet is provided on the heat exchange plate (6) located at the outermost circle, and the radius of the arc corresponds to the radius of the sewage outlet pipe (15) so as to be directly connected to the sewage outlet pipe (15).

8. The equal flow path pure countercurrent open heat exchanger according to any one of claims 1 to 4, characterized in that: A sewage pipe box (141) connected to the sewage inlet pipe (14) is arranged at the bottom of the shell (1), and distribution holes (142) corresponding to the positions of the sewage flow channels are opened on the sewage pipe box (141), and each distribution hole (142) provides sewage to each sewage flow channel from bottom to top; a sewage outlet for discharging sewage to the outside is arranged at the bottom of the shell (1), and a sewage discharge joint (143) is opened on the sewage pipe box (141) outside the shell (1).

9. The equal flow path pure countercurrent open heat exchanger according to any one of claims 1 to 4, characterized in that: The opening at the top of the shell (1) is closed by a cover (2), one end of which is hingedly matched with the shell (1) so as to flip over and cover the opening of the shell (1); a drive shaft (4) is axially arranged in the shell (1), and the drive shaft (4) is driven to rotate by a drive motor (3), and the drive motor (3) is detachably fixed to the cover (2) via a motor seat.

10. The equal flow path pure countercurrent open heat exchanger according to claim 9, characterized in that: A cleaning rod is fixed on the driving shaft (4) and is arranged radially along the shell (1). There is an installation gap between the cover (2) and the heat exchange plate to allow the cleaning rod to rotate. Vertically arranged brushes are arranged at intervals on the cleaning rod, and the brush surface of the brush contacts the plate surface of the corresponding heat exchange plate.

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