An equal-flow-path high-efficiency heat transfer sewage treatment heat exchange system

Abstract

The present application relates to the field of sewage treatment, and particularly relates to an equal-flow-path high-efficiency heat transfer sewage treatment heat exchange system, which comprises a sewage pool, a coarse filtration unit, a heat exchanger and a fine filtration unit arranged in sequence along the flow direction of sewage, and the liquid level of the sewage pool is higher than the height of the sewage outlet pipe of the heat exchanger; the sewage is treated and purified by the fine filtration unit after heat exchange in the heat exchanger, and is converted into reclaimed water and then discharged; the heat exchange medium enters the heat exchanger, exchanges heat with the sewage and is heated, enters the condenser and exchanges heat with the cold source through the compressor, and then returns to the heat exchanger to form a heat exchange medium circulation loop. The present application realizes efficient heat recovery in the process of sewage treatment.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, and in particular to a constant flow path type high efficiency heat transfer sewage treatment heat exchange system. Background Art

[0002] Before sewage is directly discharged into rivers, lakes, or recycled, it often requires pretreatment to produce reclaimed water (which has a quality intermediate between clean water and sewage and can be used for irrigation, toilet flushing, groundwater replenishment, and other purposes). The current standard sewage treatment process is as follows: 1. Large impurities are removed from the sewage through screens and other means to prevent them from clogging or damaging subsequent treatment equipment. The sewage is then directed into a regulating tank to regulate the water quality and quantity, ensuring a more stable quality and quantity. 2. The sewage undergoes physical and chemical treatment. By adding a coagulant, suspended matter and colloids in the sewage form flocs and settle them, removing them from the water. The sewage is then filtered to remove suspended matter and impurities. 3. Organic matter in the sewage is degraded using activated sludge or biofilm processes, resulting in purification. 4. The sewage is disinfected to kill pathogenic microorganisms in the water. After completing these steps, the sewage becomes reclaimed water and can be discharged or recycled. However, current conventional sewage treatment does not take into account the recovery of heat in sewage. During the sewage treatment process, the heat of the sewage is gradually dissipated and cannot be effectively utilized, resulting in a large amount of heat source being wasted. Therefore, it is urgent to solve this problem. Summary of the Invention

[0003] In order to avoid and overcome the technical problems existing in the prior art, the present invention provides a high-efficiency heat transfer system for sewage treatment with equal flow path. The present invention realizes high-efficiency heat recovery during the sewage treatment process.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A high-efficiency heat transfer sewage treatment heat exchange system with equal flow path comprises a sewage pool, a coarse filter unit, a heat exchanger and a fine filter unit arranged in sequence along the flow direction of sewage. The liquid level of the sewage pool is higher than the height of the sewage outlet pipe of the heat exchanger. After the sewage is heat exchanged in the heat exchanger, it is treated and purified by the fine filter unit and converted into reclaimed water for discharge. The heat exchange medium enters the heat exchanger to exchange heat with the sewage and then heats up. After passing through the compressor, it enters the condenser to exchange heat with the cold source and then returns to the heat exchanger to form a heat exchange medium circulation loop.

[0006] As a further solution of the present invention: the coarse filtration unit includes a coarse grid, and the fine filtration unit includes a fine grid, a cyclone sand settling tank, an oxidation ditch, a secondary sedimentation tank, a high-density tank, a rotary filter and a contact disinfection tank arranged in sequence along the sewage flow direction.

[0007] As a further scheme of the present application: the heat exchanger comprises a barrel-shaped shell, N rings of annular heat exchange plates are coaxially arranged in the shell, the flow path of each heat exchange plate increases in equal difference from inside to outside; the inner cavity of the heat exchange plate constitutes a heat exchange medium flow channel, and the sewage flow channel is constituted between adjacent heat exchange plates; a separation weld is horizontally arranged on the heat exchange plate, the separation weld separates 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 path, and the upper heat exchange area and the lower heat exchange area are 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 ring of heat exchange plates is communicated with the heat exchange medium inlet joint of the lower heat exchange area in the N+1-i th ring of heat exchange plates through a distribution pipe, so as to form N groups of heat exchange medium channels with the same flow path.

[0008] As a further scheme of the present application: the heat exchange medium inlet joint and the heat exchange medium outlet joint of the upper heat exchange area and the lower heat exchange area are arranged at the bottom of the heat exchange plate, the ends of the separation weld extend downward to form a flow guide weld, the separation weld and the flow guide weld cooperate to form a U-shaped weld with an opening downward, the U-shaped weld is a boundary point in the heat exchange plate, the inside of the U-shaped weld constitutes the lower heat exchange area, and the outside of the U-shaped weld constitutes the upper heat exchange area; the heat exchange medium inlet joint and the heat exchange medium outlet joint of the upper heat exchange area and the lower heat exchange area are symmetrically arranged on both sides of one of the flow guide welds, and the heat exchange medium inlet joint and the heat exchange medium outlet joint of the upper heat exchange area and the lower heat exchange area are symmetrically arranged on both sides of the other flow guide weld; the flow distribution weld is arranged in the vertical direction in the upper heat exchange area and the lower heat exchange area, and the flow distribution weld corresponds to the vertical position of the heat exchange medium inlet joint and the heat exchange medium outlet joint.

[0009] As a further scheme of the present application: the heat exchange plate is formed by bending and welding a flat plate to form an annular plate, the heat exchange plate comprises two groups of plate pieces fixed by edge welding, the plate bodies of the two plate pieces are fixed by welding points arranged uniformly, the plate cavity of the heat exchange plate is pressurized and bulged to form a plurality of heat exchange medium flow cavities, each heat exchange medium flow cavity is bounded by four groups of rhombic arrangement welding points, and the opening of the heat exchange medium flow cavity is constituted between the adjacent two groups of welding points of the upper and lower plate pieces, and each opening of the heat exchange medium flow cavity is communicated with the adjacent heat exchange medium flow cavity.

[0010] As a further scheme of the present application: the welding point is a circular welding point, a space rectangular coordinate system is established with the center of the welding point as the origin, the plate surface arrangement direction of the heat exchange plate corresponds to the plane between the Z axis and the X axis in the space rectangular coordinate system, the distance between two groups of welding points arranged far apart in the heat exchange medium flow cavity is 2S T , the distance between the other two groups of welding points arranged close together in the heat exchange medium flow cavity is 2S L , and the maximum bulging height of the heat exchange medium flow cavity along the Y axis direction is δ; in the space rectangular coordinate system, the contour coordinates of the heat exchange medium flow cavity on the Y axis are:

[0011]

[0012] As a further scheme of the present application: the shell is provided with a heat exchange medium inlet pipe and a heat exchange medium outlet pipe, the heat exchange medium inlet pipe supplies heat exchange medium to each upper heat exchange zone through an inlet branch pipe, and the heat exchange medium outlet pipe receives heat exchange medium discharged from each lower heat exchange zone through an outlet branch pipe, 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; the welding line width of the top edge of each heat exchange plate in the inner circle is ≤2 cm, the welding line width of the bottom of each heat exchange plate in the inner circle is ≥6 cm, and the bottom welding line is uniformly provided with flow equalization holes along the circumference to connect the sewage flow channels on both sides of the heat exchange plate, and the diameter of each flow equalization hole is ≥3 cm.

[0013] As a further scheme of the present application: the top of the upper heat exchange zone is provided with an exhaust hole, and the separation welding line is provided with an air hole for the gas in the lower heat exchange zone to enter the upper heat exchange zone; each heat exchange plate is provided with an overflow port for sewage to pass through, each overflow port corresponds in height to a sewage outlet pipe on the shell, and the heat exchange plate in the outermost circle is provided with an arc-shaped outlet corresponding in radius to the sewage outlet pipe to directly connect the sewage outlet pipe.

[0014] As a further scheme of the present application: the shell bottom is provided with a sewage pipe box in communication with the sewage inlet pipe, the sewage pipe box is provided with distribution holes corresponding in position to each sewage flow channel, and each distribution hole provides sewage to each sewage flow channel from bottom to top; the shell bottom is provided with a sewage discharge port for discharging sewage outward, the sewage pipe box is provided with a sewage discharge joint outside the shell; the opening at the top of the shell is closed by a cover; a drive shaft is arranged in the shell along the axial direction, the drive shaft is driven to rotate by a drive motor, the drive motor is detachably fixed on the cover by a motor base, a cleaning rod is fixed on the drive shaft and arranged along the radial direction of the shell, there is an installation gap between the cover and the heat exchange plate for the cleaning rod to rotate, and brushes are arranged on the cleaning rod in a vertical manner at intervals, and the brush surface of the brushes is in contact with the plate surface of the corresponding heat exchange plate.

[0015] As a further scheme of the present application: temperature sensors and flow sensors are installed at the inlet and outlet joints of the heat exchange medium of the upper heat exchange zone and the lower heat exchange zone to monitor the fluid temperature and flow of the heat exchange medium, and pressure sensors are installed in the upper heat exchange zone and the lower heat exchange zone to monitor the heat exchange medium flow channel pressure; the inlet and outlet temperatures of the heat exchange medium are monitored by the temperature sensors, compared with the set temperature target value, and the heat exchange medium flow is adjusted by the PID controller according to the temperature difference to maintain the heat exchange medium outlet temperature constant; the monitoring values of the temperature sensors, pressure sensors and flow sensors are smoothed by Kalman filtering algorithm, the smoothed temperature, flow and pressure historical data are collected and stored, the historical data are used as training samples and input into the machine learning algorithm, and the mapping relationship between the heat exchange medium flow and pressure parameters and the heat exchange medium inlet and outlet temperatures is established through the learning and training of the algorithm; the trained model is used for prediction, new operation parameters are input, and the outlet temperature of the heat exchange medium is predicted.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] 1、The present application realizes efficient recovery of heat in the sewage treatment process, and through the height difference between the sewage pool liquid surface and the sewage outlet pipe in the heat exchanger and the open design, the sewage in the sewage pool can continuously enter the heat exchanger for heat exchange under the action of gravitational potential energy without the need to install a large number of booster pumps.

[0018] 2、The equal flow path design of the heat exchange medium flow channel makes the flow cross-sectional area and flow length of all heat exchange medium flow paths completely the same when the heat exchange medium passes through the inside of the heat exchanger, realizes uniform distribution of the heat exchange medium flow, and the overall flow path is pure counter-flow, realizes full utilization of the clean working medium heat, improves the heat exchange efficiency, and avoids the influence of the inconsistent flow path of the inner and outer circles of the concentric circular design heat exchange pipe on heat exchange.

[0019] 3、The present application performs bulging design on the heat exchange plate, calculates the optimal bulging profile of the heat exchange plate to maximize the heat exchange efficiency, and can ensure that the heat exchanger has high heat exchange efficiency while reducing the volume of the heat exchanger, and the heat exchanger is not prone to blockage.

[0020] 4、The non-clean working medium of the present application is distributed to the sewage flow channel between adjacent heat exchange plates through the distribution hole of the sewage pipe box, flows from bottom to top and gathers through the overflow port, and then flows out from the sewage outlet pipe, the vertical flow path is the same, forming an equal flow path to ensure uniform heat exchange.

[0021] 5、The adjacent heat exchange plates of the present application are free of any pipeline obstacles, and through the rotation of the cleaning rod driven by the motor, the raw sewage has a horizontal direction of the same angular velocity, which increases the flow rate of the sewage itself and increases the 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, remove the dirt and biofilm deposition that may be generated during long-term operation, and the outer side of the plate always maintains a "new" state, physically removing the biofilm or dirt deposited on the surface, at the same time, the wall surface of the sewage side has a heat resistance of 0, maintaining the heat exchange performance of the heat exchanger, realizing the dual purposes of "preventive self-cleaning" and "non-clean side disturbance heat exchange enhancement". BRIEF DESCRIPTION OF DRAWINGS

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

[0023] Figure 2 It is Figure 1 a structural schematic diagram of the heat exchanger in the middle.

[0024] Figure 3 It is a structural schematic diagram of the inner ring heat exchange plate in the present application after being laid out.

[0025] Figure 4 It is a structural schematic diagram of the outermost ring heat exchange plate in the present application after being laid out.

[0026] Figure 5 It is a schematic diagram of the flow path connection of the heat exchange plate in the present application.

[0027] Figure 6 It is a partial sectional view of the heat exchange plate in the present application.

[0028] In the figure:

[0029] 1, shell; 11, heat exchange medium inlet pipe; 12, heat exchange medium outlet pipe;

[0030] 13, distribution pipe; 14, sewage inlet pipe;

[0031] 141, sewage pipe box; 142, distribution hole; 143, sewage joint; 15, sewage outlet pipe;

[0032] 2, cover; 3, driving motor; 4, driving shaft;

[0033] 6, heat exchange plate; 61, plate piece; 62, heat exchange medium flow cavity; 63, welding point;

[0034] 64, heat exchange medium inlet joint; 65, heat exchange medium outlet joint;

[0035] 66, overflow port; 67, exhaust hole; 68, separation welding line;

[0036] 681, flow guiding welding wire; 682, flow dividing welding wire; 683, upper heat exchange zone; 684, lower heat exchange zone;

[0037] 69, current sharing hole. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0039] Please refer to Figures 1-6 In the embodiments of the present application, an equal-flow-path high-efficiency heat transfer sewage treatment heat exchange system includes a sewage pool, a coarse filter unit, a heat exchanger and a fine filter unit arranged in sequence along the flow direction of raw sewage. The coarse filter unit is a coarse grid for filtering large floating objects. After coarse filtration by the coarse grid, the sewage in the sewage pool is pumped to the fine grid by a booster pump house for fine filtration treatment, or directly delivered to the heat exchanger for heat exchange.

[0040] After the sewage enters the heat exchanger, the heat exchanger is used as an evaporator of a heat pump system. The heat exchange medium exchanges heat with the sewage in the heat exchanger, and then passes through a compressor and a condenser in sequence to heat the return water on the user side. The return water on the user side returns after being heated, and is used for heating. The heat exchange medium after heat release by the condenser returns to the heat exchanger after throttling by a throttle valve to reabsorb heat from the sewage, thereby forming a heat exchange medium circulation. The liquid level of the sewage pool is higher than the sewage outlet pipe of the heat exchanger by 15 pipe openings. Efficient heat exchange is achieved under the action of gravitational potential energy through the difference in liquid level height.

[0041] The fine filter unit includes a fine grid, a cyclone grit chamber, an oxidation ditch, a secondary sedimentation tank, a high-density tank, a rotary disc filter tank and a contact disinfection tank arranged in sequence along the flow direction of the sewage. The cyclone grit chamber is used for static sedimentation of the sewage. When the sewage passes through the oxidation ditch, cultivated aerobic bacteria are added. The disinfection interval of the contact disinfection tank is disinfected by adding chlorine, and then purified into reclaimed water and discharged into rivers, lakes and seas, or delivered to the heat exchanger for waste heat utilization after being purified into reclaimed water.

[0042] The shell 1 of the heat exchanger is in the form of a barrel structure with an open top. A cover 2 is installed at the open bottom of the shell 1.

[0043] The cover 2 is hingedly connected to the shell 1 through a hinge structure, so as to be able to close the opening of the shell 1 through a flip opening and closing action. A handle structure is provided on the cover 2 to facilitate manual opening and closing of the cover 2. A motor base is installed on the cross beam of the cover 2 to install a driving motor 3.

[0044] A plurality of heat exchange plates 6 are coaxially arranged in the shell 1. A separation weld line 68 is formed on each heat exchange plate 6 in the horizontal direction. The length of the separation weld line 68 is less than the length of the heat exchange plate 6 when unfolded, and a spacing exists between the two ends of the separation weld line 68 and the weld seams on the two sides of the heat exchange plate 6. Two parallel flow guide weld lines 681 are vertically arranged at the two ends of the separation weld line 68. The two flow guide weld lines 681 and the separation weld line 68 form a U-shaped weld line, which divides the heat exchange medium flow channel in the heat exchange plate 6 into two heat exchange zones. The inner circle of the U-shaped weld line is a lower heat exchange zone 684, and the outer circle of the U-shaped weld line is an upper heat exchange zone 683. The flow path of the heat exchange medium flow channel in the upper heat exchange zone 683 and the lower heat exchange zone 684 is equal.

[0045] The heat exchange plate 6 is a hollow plate and is bent and welded to form a ring-shaped plate. The heat exchange plate 6 includes two groups of plate pieces 61. The edges of the two plate pieces 61 are fixedly welded. The two plate pieces 61 are fixedly welded by evenly arranged weld points 63. After being pressed, a bulging three-dimensional space is formed between the weld points 63. Specifically, the plate piece 61 is formed by stacking two metal plates and using laser or resistance welding. Then, the inlet and outlet pipes are connected, and the remaining edge part of the plate piece is sealed again by laser or resistance welding. Finally, hydraulic bulging forming is performed.

[0046] The arrangement of the weld points 63 is in the form of multiple rows on the vertical plate surface of the plate piece 61. The spacing between the weld points 63 of each row is equal, and the vertical positions of the weld points 63 of adjacent two rows are staggered. Four groups of diamond-shaped distributed weld points 63 form a heat exchange medium flow cavity 62. The heat exchange medium flow cavity 62 is provided with multiple groups. The heat exchange medium flow cavity 62 at the non-edge position has four openings. Each opening is in communication with the openings of the adjacent heat exchange medium flow cavities 62, thereby allowing the heat exchange medium to flow in the three-dimensional space of the heat exchange plate 6. The weld point 63 is preferably a circular ring type weld point.

[0047] A space rectangular coordinate system is established with the center of the weld point 63 as the origin. The plate surface arrangement direction of the heat exchange plate 6 corresponds to the plane between the Z axis and the X axis in the space rectangular coordinate system. The spacing between two groups of weld points 63 arranged far apart in the heat exchange medium flow cavity 62 is 2S T , the spacing between the other two groups of weld points 63 arranged close together in the heat exchange medium flow cavity 62 is 2S L , and the maximum bulging height of the heat exchange medium flow cavity 62 along the Y axis direction is δ. In the space rectangular coordinate system, the contour coordinates of the heat exchange medium flow cavity 62 along the Y axis are:

[0048]

[0049] Annular sewage channels are formed between adjacent heat exchange plates 6, with each circle of channels interconnected. A drive motor 3 is mounted on the cover 2. This drive motor 3 controls the rotation of a drive shaft 4 via a reducer. The drive shaft 4 extends axially along the housing 1 and into the interior of the housing 1. A cleaning rod is secured to the drive shaft 4, its shaft extending along the diameter of the housing 1. Brushes are vertically mounted on the cleaning rods, corresponding to the height of the heat exchange plates. Two sets of brushes are preferably symmetrically arranged in each sewage channel. When the drive motor 3 rotates the cleaning rods via the drive shaft 4, the brush surfaces contact the heat exchange plates 6 on either side of the brushes, scrubbing and cleaning the plates.

[0050] 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 distribution holes 142 corresponds to the number of sewage flow channels. The distribution holes 142 are preferably rectangular holes. A sewage pipe box 141 is also provided with a sewage discharge joint 143, which is used to independently discharge the silt in the sewage pipe box 141 after opening.

[0051] Each heat exchange plate 6 has an overflow port 66 at its top. The shape of the overflow port 66 is arbitrary. The connection of the sewage outlet pipe 15 corresponds to the height of the overflow port 66 of the heat exchange plate 6. Sewage flowing upward through the overflow port 66 is discharged along the sewage outlet pipe 15. The outer plates 61 of the outermost heat exchange plates 6 are 0.3-0.5 mm thicker than the inner plates. A set of arc-shaped outlets are formed on the top of the outermost heat exchange plates 6. The radius of the arc corresponds to the radius of the sewage outlet pipe 15, which connects to the sewage outlet pipe 15. A separate sewage outlet is provided at the bottom of the shell 1. During cleaning of the heat exchanger, dirt and impurities generated by cleaning are directly discharged through the sewage outlet. Compared to 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 plates 6. The heat exchange medium inlet pipe 11 and the heat exchange medium outlet pipe 12 should preferably be arranged at a height higher than the sewage inlet pipe 14 and the sewage manifold 141.

[0052] 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 radially arranged 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 provided 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 weld on the side of the heat exchange plate 6.

[0053] The distance between the double welding lines on the top of each heat exchange plate 6 in the inner circle and the top edge is less than or equal to 2 cm, the distance between the double welding lines on the bottom and the bottom edge is greater than or equal to 6 cm, and a large number of flow-equalizing holes 69 with a diameter greater than or equal to 3 cm are evenly distributed along the circumference on the double welding lines on the bottom. The diameter of each flow-equalizing hole 69 is greater than or equal to 3 cm.

[0054] The heat exchange medium inlet joints 64 of the upper heat exchange zone 683 and the lower heat exchange zone 684 are symmetrically arranged on both sides of one of the flow 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 flow guide welding line 681. The flow guide welding lines 682 are arranged in the upper heat exchange zone 683 and the lower heat exchange zone 684 in the vertical direction, and the vertical positions of the flow guide welding lines 682 correspond to the heat exchange medium inlet joints 64 and the heat exchange medium outlet joints 65. After the heat exchange medium in the upper heat exchange zone 683 and the lower heat exchange zone 684 is horizontally divided by the flow guide welding lines 682, it flows along an annular path and is discharged through the heat exchange medium outlet joints 65.

[0055] From the inside to the outside, the flow paths of the heat exchange medium in each circle of heat exchange plates 6 are equally increased, and the two groups of heat exchange zones in different circles are connected by distribution pipes 13, thereby forming a heat exchange medium channel. The structure of the distribution pipe 13 is not limited, and in this embodiment, it is bent by multiple 90-degree elbow pipes.

[0056] The number of arranged circles of 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 parallel to each other.

[0057] This embodiment takes nine circles of heat exchange plates 6 as an example, and the two groups of heat exchange zones of each circle of heat exchange plates 6 are A zone and B zone, A zone represents the upper heat exchange zone 683, and B zone represents the lower heat exchange zone 684. The two groups of heat exchange zones of each circle of heat exchange plates 6 are connected by 9 groups of distribution pipes 13, thereby forming 9 heat exchange medium channels with the same flow path, and the specific connection mode is as follows:

[0058] 1A-9B, 2A-8B, 3A-7B, 4A-6B, 5A-5B, 6A-4B, 7A-3B, 8A-2B, 9A-1B.

[0059] Wherein, 1A-9B indicates that the upper heat exchange zone 683 of the first circle of heat exchange plates 6 and the lower heat exchange zone 684 of the ninth circle of heat exchange plates 6 are communicated through the distribution pipe 13 from inside to outside. The heat exchange medium inlet joint 64 of the upper heat exchange zone 683 of the first circle of heat exchange plates 6 is communicated with the heat exchange medium inlet pipe 11 on the shell 1 through the inlet shunt branch pipe, and the heat exchange medium outlet joint 65 of the upper heat exchange zone 683 of the first circle of heat exchange plates 6 is communicated with the heat exchange medium inlet joint 64 of the lower heat exchange zone 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 zone 684 of the ninth circle of heat exchange plates 6 is communicated with the heat exchange medium outlet pipe 12 through the outlet shunt branch pipe. The connection of the rest of the pipelines corresponds to the above connection mode, and the same applies.

[0060] On the basis of this embodiment, the heat exchange plates 6 can be divided into two groups of half zones, which are separated by vertical welds, and the two half zones are in a semi-ring structure and have equal flow paths. Each half zone is also uniformly divided into an upper heat exchange zone 683 and a lower heat exchange zone 684, and forms an equal-flow-path flow heat exchange through the distribution pipe 13. Further improvement can be made by dividing the heat exchange plates 6 into multiple groups of regions in the vertical direction, and each region is divided into an upper heat exchange zone 683 and a lower heat exchange zone 684, which expands the number of heat exchange medium channels and increases the number of distribution pipes 13.

[0061] 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 each provided with a temperature sensor and a flow sensor to monitor the fluid temperature and flow of the heat exchange medium, and a pressure sensor is installed in the upper heat exchange zone 683 and the lower heat exchange zone 684 to monitor the heat exchange medium flow channel pressure; the inlet and outlet temperatures of the heat exchange medium are monitored by the temperature sensor, compared with the set temperature target value, and the heat exchange medium flow is adjusted by the PID controller according to the temperature difference to maintain the heat exchange medium outlet temperature constant; the monitoring values of the temperature sensor, the pressure sensor and the flow sensor are smoothed by the Kalman filtering algorithm, the historical data of the smoothed temperature, flow and pressure are collected and stored, the historical data is used as a training sample and input into a machine learning algorithm, and a mapping relationship between the heat exchange medium flow and pressure parameters and the heat exchange medium inlet and outlet temperatures is established through the learning and training of the algorithm; the trained model is used for prediction, new operating parameters are input, and the outlet temperature of the heat exchange medium is predicted

[0062] In the starting state of the heat exchanger, the cover 2 is first turned over, clean water is injected into the heat exchange zones of each heat exchange plate 6 as heat exchange medium through the heat exchange medium inlet pipe 11. The clean water passes through the heat exchange medium channels 1A-9B, at this time the air exhaust holes 67 on the two groups of heat exchange zones 1A-9B are opened, after the air in the heat exchange medium channels 1A-9B is completely exhausted, the air exhaust holes 67 on the two groups of heat exchange zones 1A-9B are closed, and the air in each heat exchange medium channel is completely exhausted in turn, the cover 2 is closed, the sewage inlet pipe 14 is opened, after the liquid level is leveled with the inspection hole 21, the driving motor 3 is driven, the sewage is rotated by the brush 51, and the accumulated dirt on the surface of the heat exchanger 6 is removed by physical contact, and the starting of the heat exchanger is completed.

[0063] In the running state, the sewage outside the heat exchanger enters each sewage channel of the heat exchanger through the distribution holes 142 of the sewage pipe box 141, and flows freely through the flow equalizing holes 69, so that the sewage liquid level in the heat exchanger is balanced. When the brush is rotated by the driving motor 3, the original sewage has a horizontal rotational speed, which has two beneficial effects, one is that the flow rate of the fluid itself increases, increasing the turbulent disturbance, and the other is that 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 during long-term operation, and the outer side of the plate always maintains a "new" state.

[0064] When discharging sewage and inspecting and maintaining, the sewage outlet pipe 15 is closed, the sewage discharge joint 143 on the sewage pipe box 141 and the sewage discharge port at the bottom of the heat exchanger are opened, and the sewage flows outwards through the sewage discharge port and the sewage discharge joint 143 under the action of gravity. After the sewage is discharged, the cover 2 is opened, and the accumulated dirt at the opening of the distribution holes 142 of the sewage pipe box 141 is removed by washing downward from the top with a high-pressure water gun. In addition, the sewage inlet pipe 14 and the sewage pipe box 141 are directly cleaned by the high-pressure water gun, and the dirt or impurities can be directly discharged from the sewage discharge port by the water gun cleaning.

[0065] Taking the Reynolds number as a variable, under the condition that the heat exchange medium and the heat exchange flow rate and flow are the same, the comparison of 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 application is shown in the following Table 1. It can be seen that the heat exchange efficiency of the heat exchange plate of the present application is much higher than that of the traditional rectangular hollow heat exchange plate when other conditions are the same.

[0066] Table 1

[0067]

[0068] The basic principles of the application are described above by way of example in connection with specific embodiments, but it should be noted that the advantages, benefits, effects and the like mentioned in the present application are only examples and are not intended to be limiting, and it cannot be considered that these advantages, benefits, effects and the like are necessarily possessed by each embodiment of the present application. In addition, the specific details of the above disclosure are only for the purpose of example and for the purpose of understanding, and are not limiting, and the above details do not limit the present application to necessarily adopt the above specific details for implementation.

[0069] The block diagrams of the devices, apparatuses, equipment, systems involved in the present application are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be as shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, systems can be connected, arranged, configured in any manner. Words such as "include", "contain", "have" and the like are open-ended words, mean "including but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

Claims

1. A high-efficiency heat transfer system for sewage treatment with equal flow path, characterized in that: The invention comprises a sewage pool, a coarse filter unit, a heat exchanger and a fine filter unit arranged in sequence along the flow direction of sewage, wherein the liquid level of the sewage pool is higher than the height of the sewage outlet pipe (15) of the heat exchanger; after the sewage is heat-exchanged in the heat exchanger, it is treated and purified by the fine filter unit and converted into reclaimed water before being discharged; the heat exchange medium enters the heat exchanger, exchanges heat with the sewage and is heated, then enters the condenser through the compressor, exchanges heat with the cold source and returns to the heat exchanger, thereby forming a heat exchange medium circulation loop; The coarse filtration unit includes a coarse grid, and the fine filtration unit includes a fine grid, a cyclone sand settling tank, an oxidation ditch, a secondary sedimentation tank, a high-density tank, a rotary filter tank, and a contact disinfection tank arranged in sequence along the sewage flow direction; The heat exchanger comprises a barrel-shaped shell (1), wherein N ring-shaped 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 space between adjacent heat exchange plates (6) constitutes a sewage flow channel; a separation weld line (68) is horizontally arranged on the heat exchange plate (6), and the separation weld 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 (683) 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), so as to form N groups of heat exchange medium channels with the same flow path.

2. The equal flow path high efficiency heat transfer sewage treatment heat exchange system according to claim 1 is 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), and 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 diverter welding lines (682) spaced apart in the vertical direction, and the diverter 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 high efficiency heat transfer sewage treatment heat exchange system according to claim 1 is 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) includes two groups of plate sheets (61) with their edges 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 high efficiency heat transfer sewage treatment heat exchange system according to claim 3 is 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 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 at a distance opposite to each other 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:

5. The equal flow path high efficiency heat transfer wastewater treatment heat exchange system 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); 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 equalizing holes (69) are evenly opened along the circumferential direction 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 equalizing hole (69) is ≥3 cm.

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

7. The equal flow path high efficiency heat transfer wastewater treatment heat exchange system according to any one of claims 1 to 4, characterized in that: The bottom of the shell (1) is provided with a sewage pipe box (141) connected to the sewage inlet pipe (14), and the sewage pipe box (141) is provided with distribution holes (142) corresponding to the positions of the sewage flow channels, and each distribution hole (142) provides sewage to each sewage flow channel from bottom to top; the bottom of the shell (1) is provided with a sewage outlet for discharging sewage outward, and the sewage pipe box (141) is provided with a sewage discharge joint (143) outside the shell (1); the opening at the top of the shell (1) is closed by a cover (2); a drive shaft (4) is axially provided 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) through a motor seat, and a cleaning rod arranged radially along the shell (1) is fixed on the drive shaft (4), and an installation gap is provided between the cover (2) and the heat exchange plate for the rotation of the cleaning rod, 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.

8. The equal flow path high efficiency heat transfer wastewater treatment heat exchange system according to any one of claims 1 to 4, characterized in that: Temperature sensors and flow sensors are installed at 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) to monitor the fluid temperature and flow of the heat exchange medium. Pressure sensors are installed in the upper heat exchange zone (683) and the lower heat exchange zone (684) to monitor the flow channel pressure of the heat exchange medium. The inlet and outlet temperatures of the heat exchange medium are monitored by the temperature sensors and compared with the set temperature target value. According to the temperature difference, the heat exchange medium flow is adjusted by the PID controller to maintain the heat exchange medium outlet temperature constant. The monitoring values ​​of the temperature sensor, pressure sensor and flow sensor are smoothed by the Kalman filter algorithm, and the historical data of the temperature, flow and pressure after smoothing are collected and stored. The historical data are used as training samples and input into the machine learning algorithm. Through the learning and training of the algorithm, a mapping relationship between the heat exchange medium flow and pressure parameters and the inlet and outlet temperatures of the heat exchange medium is established. The trained model is used for prediction, and new operating parameters are input to predict the outlet temperature of the heat exchange medium.

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