A water-based polyurethane waste liquid flotation recovery device

Abstract

This invention provides an aqueous polyurethane wastewater flotation recovery device, including a housing. Inside the housing is an outward-opening wastewater filtration chamber. A diffuser is fixed at the center of the filtration chamber, and several bubble generators are fixed at the bottom of the diffuser in a vortex-like arrangement. Input pipes are connected to both sides of the bottom of the diffuser. This solution uses vortex-like bubble generators to create a rotating upward flow field within the diffuser. Combined with a flared structure to reduce fluid velocity, this significantly extends the contact time between microbubbles and polyurethane particles, greatly improving particle capture efficiency. The solution uses a dual filtration system consisting of a primary filter plate, a secondary filter plate, and a filter sleeve to effectively intercept large impurities and residual particles, ensuring that the discharged water meets industrial reuse standards.

Description

Technical Field

[0001] This utility model relates to the field of waste liquid flotation recovery technology, specifically to a water-based polyurethane waste liquid flotation recovery device. Background Technology

[0002] Waterborne polyurethane materials are widely used in coatings, adhesives, leather processing and other fields due to their combination of environmental protection and functionality. However, the waste liquid generated during the production process contains unreacted polyurethane resin, solvents and additives. Direct discharge of such waste liquid would lead to resource waste and environmental pollution.

[0003] In existing technologies, air flotation, as a solid-liquid separation technology, achieves recovery by injecting microbubbles into the waste liquid to allow polyurethane particles to adhere and float. However, conventional air flotation devices have the following technical bottlenecks: First, the large bubble size results in low adhesion efficiency with micron-sized polyurethane particles, leading to insufficient recovery rates; second, the dissolved air system has high energy consumption and poor bubble stability, making it prone to coalescence and breakage; third, the high moisture content of the scum during the scum scraping process leads to high costs for subsequent dewatering treatment. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides an aqueous polyurethane waste liquid air flotation recovery device, which solves the problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a high-efficiency, low-consumption, and widely adaptable waterborne polyurethane waste liquid flotation recovery device, comprising a recovery device shell, a waste liquid filtration chamber with an outward opening inside the recovery device shell, a gradually expanding tube fixedly positioned at the center of the waste liquid filtration chamber, a plurality of bubble generators fixedly positioned at the bottom of the gradually expanding tube, the bubble generators being arranged in a vortex shape, an input pipe connected to both sides of the bottom of the gradually expanding tube, the other end of the input pipe passing through one side wall of the recovery device shell and extending outward, two arc-shaped supports respectively provided on both sides of the top of the recovery device shell, a drive shaft rotatably connected to one side of the arc-shaped supports on both sides, a rotating sleeve fixedly connected to the outer end face of the drive shaft on both sides, a plurality of arrayed connecting rods fixedly provided on the outer end face of the rotating sleeve, and a waste liquid push plate inserted between the connecting rods in the same row.

[0008] Preferably, a drive motor is fixedly mounted on the top of the arc-shaped bracket on one side, and the drive motor is poweredly connected to the drive shaft.

[0009] Preferably, two inclined waste liquid guide plates are fixedly provided on both sides of the outer end face of the outer shell of the recycling device. The inclined waste liquid guide plates on both sides are symmetrically arranged and are located below the rotating sleeve.

[0010] Preferably, the inclined waste liquid guide plate is provided with an inclined groove with an outward opening, and the inclined groove is connected to the top of the waste liquid filtration chamber.

[0011] Preferably, two arc-shaped and inclined guide plates are fixedly provided on both sides of the inner wall of the waste liquid filtration chamber, and the arc-shaped guide plates on both sides are symmetrically arranged.

[0012] Preferably, two waste liquid input devices are fixedly provided on both sides of the outer end face of the outer shell of the recycling device, and the positions of the waste liquid input devices on both sides are symmetrically arranged.

[0013] Preferably, the waste liquid input device is provided with a primary filter tank with an outward opening, and a primary filter plate is installed in the primary filter tank. The other side of the input pipe is installed and connected to the bottom of the waste liquid input device and communicates with the bottom of the primary filter tank.

[0014] Preferably, a waste liquid input pipe is connected to one side of the top of the waste liquid input device.

[0015] Preferably, the bottom of the waste liquid filtration chamber is connected to two clean water pipes, which are symmetrically arranged and used to output the filtered clean water.

[0016] Preferably, a filter sleeve is installed at the bottom of the waste liquid filtration chamber and outside the opening of the clean water pipe, and a secondary filter plate is installed at the top of the filter sleeve.

[0017] (III) Beneficial Effects

[0018] This invention provides a water-based polyurethane waste liquid flotation recovery device. It has the following beneficial effects:

[0019] 1. This solution uses a vortex-shaped bubble generator to form a rotating upward flow field inside the diffuser tube. Combined with the flared structure, it reduces the fluid velocity, significantly prolongs the contact time between microbubbles and polyurethane particles, and greatly improves particle capture efficiency.

[0020] 2. This solution uses a dual filtration system consisting of a primary filter plate, a secondary filter plate, and a filter sleeve to effectively intercept large particles and residual microparticles, ensuring that the discharged clean water meets industrial reuse standards.

[0021] 3. This solution replaces the traditional high-pressure dissolved gas tank with a gradually expanding tube structure, utilizes the Venturi effect to achieve spontaneous bubble generation, and forms a flow channel through the arc-shaped guide plate and the inclined waste liquid guide plate, which can meet the needs of waste liquid treatment with a wide range of concentrations. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the external structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the main structure of this utility model;

[0024] Figure 3 This is a side view of the structure of this utility model;

[0025] Figure 4 This is a front view structural diagram of the present utility model;

[0026] Figure 5 This utility model Figure 4 A schematic diagram of the structure in the AA direction.

[0027] In the diagram: 101, outer casing of the recycling device; 102, inclined waste liquid guide plate; 103, inclined trough; 104, waste liquid push plate; 105, rotating sleeve; 106, drive shaft; 107, drive motor; 108, waste liquid filtration chamber; 109, diffuser; 110, connecting rod; 111, primary filtration tank; 112, primary filter plate; 113, waste liquid input pipe; 114, input pipe; 115, waste liquid input device; 116, clean water pipe; 117, arc-shaped support; 118, filter sleeve; 119, secondary filter plate; 120, bubble generator; 121, arc-shaped guide plate. Detailed Implementation

[0028] This utility model embodiment provides an aqueous polyurethane waste liquid air flotation recovery device, such as... Figure 1-5 As shown, the device includes a recycling device housing 101. Inside the recycling device housing 101, there is a waste liquid filtration chamber 108 with an outward opening. A diffuser 109 is fixedly installed at the center of the waste liquid filtration chamber 108. Several bubble generators 120 are fixedly installed at the bottom of the diffuser 109. The bubble generators 120 are arranged in a vortex shape. Input pipes 114 are connected to both sides of the bottom of the diffuser 109. The other end of the input pipe 114 passes through one side wall of the recycling device housing 101 and extends outward. Two arc-shaped supports 117 are respectively provided on both sides of the top of the recycling device housing 101. The arc-shaped supports 117 on both sides are close to each other and rotatably connected to a drive shaft 106 on one side. Rotating sleeves 105 are fixedly connected to the outer end faces of the drive shafts 106 on both sides. Several arrayed connecting rods 110 are fixedly installed on the outer end faces of the rotating sleeves 105. Waste liquid push plates 104 are inserted between the connecting rods 110 in the same row.

[0029] It should be further noted that the bubble generator 120 is used to generate microbubbles.

[0030] Furthermore, a drive motor 107 is fixedly mounted on the top of the arc-shaped bracket 117 on one side, and the drive motor 107 is poweredly connected to the drive shaft 106.

[0031] It is worth further explaining that when the drive motor 107 starts, it can drive the drive shaft 106 to rotate through the power connection, which in turn can drive the rotating sleeve 105 to rotate through the transmission, which in turn drives the connecting rods 110 on each side to rotate, and further drives the waste liquid push plate 104 to rotate.

[0032] Furthermore, two inclined waste liquid guide plates 102 are fixedly provided on both sides of the outer end face of the outer shell 101 of the recycling device. The inclined waste liquid guide plates 102 on both sides are symmetrically arranged and are located below the rotating sleeve 105.

[0033] Furthermore, the inclined waste liquid guide plate 102 is provided with an inclined groove 103 with an outward opening, and the inclined groove 103 is connected to the top of the waste liquid filter chamber 108.

[0034] Furthermore, two arc-shaped and inclined arc-shaped guide plates 121 are fixedly provided on both sides of the inner wall of the waste liquid filtration chamber 108, and the arc-shaped guide plates 121 on both sides are symmetrically arranged.

[0035] It should be further explained that the inclined trough 103 serves to guide the waste liquid output. When the rotating sleeve 105 is driven to rotate, it can rotate through the waste liquid push plate 104 and push the waste liquid to the inclined trough 103 for output.

[0036] Furthermore, two waste liquid input devices 115 are fixedly provided on both sides of the outer end face of the outer shell 101 of the recycling device, and the waste liquid input devices 115 on both sides are symmetrically arranged.

[0037] Furthermore, the waste liquid input device 115 is provided with an outward-facing primary filter tank 111, and a primary filter plate 112 is installed in the primary filter tank 111. The other side of the input pipe 114 is installed and connected to the bottom of the waste liquid input device 115 and communicates with the bottom of the primary filter tank 111.

[0038] Furthermore, a waste liquid input pipe 113 is connected to one side of the top of the waste liquid input device 115.

[0039] It should be further noted that the waste liquid inlet pipe 113 is connected to the inlet pipe of the water-based polyurethane waste liquid.

[0040] Furthermore, the bottom of the waste liquid filtration chamber 108 is connected to two clean water pipes 116, which are symmetrically arranged and used to output the filtered clean water.

[0041] Furthermore, a filter sleeve 118 is installed at the bottom of the waste liquid filtration chamber 108 and outside the opening of the clean water pipe 116, and a secondary filter plate 119 is installed at the top of the filter sleeve 118.

[0042] It should be further explained that the secondary filter plate 119 provides a further output filtration effect.

[0043] The usage method of this solution is as follows:

[0044] S1. The water-based polyurethane waste liquid is injected into the waste liquid inlet 115 through the waste liquid inlet pipe 113. The waste liquid first enters the primary filter tank 111.

[0045] After initial filtration by the primary filter plate 112 to remove large particulate impurities, the pretreated waste liquid enters the bottom of the diffuser 109 through the input pipe 114.

[0046] S2. Start the bubble generator 120 to generate a large number of micron-sized bubbles in the diffuser tube 109;

[0047] Because the bubble generator 120 is vortex-shaped, the bubble group forms a rotating upward flow field in the diffuser 109, allowing the microbubbles to fully collide and adhere with the polyurethane particles in the waste liquid.

[0048] The flared structure of the diffuser 109 reduces the fluid velocity, prolongs the gas-solid contact time, and significantly improves particle capture efficiency.

[0049] S3. The bubbles of the adhering particles float to the top of the waste liquid filtration chamber 108, forming a high-concentration scum layer;

[0050] Start the drive motor 107, which drives the rotating sleeve 105 to rotate via the drive shaft 106, and the waste liquid push plate 104 fixed on the connecting rod 110 rotates accordingly.

[0051] The pusher plate 104 pushes the scum layer outward along the inclined surface of the arc-shaped guide plate 121, squeezing the scum and reducing its moisture content in the process.

[0052] S4. The scum after being squeezed and dehydrated is pushed into the inclined trough 103 by the waste liquid pusher plate 104, and slides out of the device along the inclined waste liquid guide plate 102 to realize the recovery of dry scum.

[0053] After the scum is separated, the clear water sinks to the bottom of the waste liquid filtration chamber 108, and then undergoes fine filtration through the secondary filter plate 119 and the filter sleeve 118 in sequence. Finally, it is discharged through the clear water pipe 116, meeting the reuse standard.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waterborne polyurethane wastewater flotation recovery device, comprising a recovery device housing (101), characterized in that: The outer casing (101) of the recycling device is provided with an outward-opening waste liquid filtration chamber (108). A diffuser tube (109) is fixedly installed at the center of the waste liquid filtration chamber (108). Several bubble generators (120) are fixedly installed at the bottom of the diffuser tube (109). The bubble generators (120) are arranged in a vortex shape. Input pipes (114) are connected to both sides of the bottom of the diffuser tube (109). The other end of the input pipe (114) passes through the outer casing (101) of the recycling device. One side wall extends outward, and two arc-shaped supports (117) are respectively provided on the top two sides of the outer shell (101) of the recycling device. The arc-shaped supports (117) on both sides are rotatably connected to a drive shaft (106) close to each other. The outer end face of the drive shaft (106) on both sides is fixedly connected to a rotating sleeve (105). The outer end face of the rotating sleeve (105) is fixedly provided with a number of arrayed connecting rods (110). Waste liquid push plates (104) are inserted between the connecting rods (110) in the same row.

2. The aqueous polyurethane wastewater flotation recovery device according to claim 1, characterized in that: A drive motor (107) is fixedly mounted on the top of the arc-shaped bracket (117) on one side, and the drive motor (107) is poweredly connected to the drive shaft (106).

3. The aqueous polyurethane wastewater flotation recovery device according to claim 1, characterized in that: Two inclined waste liquid guide plates (102) are fixedly provided on both sides of the outer end face of the outer shell (101) of the recycling device. The inclined waste liquid guide plates (102) on both sides are symmetrically arranged and are located below the rotating sleeve (105).

4. The aqueous polyurethane wastewater flotation recovery device according to claim 3, characterized in that: The inclined waste liquid guide plate (102) is provided with an inclined groove (103) with an outward opening, and the inclined groove (103) is connected to the top of the waste liquid filter chamber (108).

5. The aqueous polyurethane wastewater flotation recovery device according to claim 4, characterized in that: Two arc-shaped and inclined arc-shaped guide plates (121) are fixed on both sides of the inner wall of the waste liquid filtration chamber (108), and the arc-shaped guide plates (121) on both sides are symmetrically arranged.

6. The aqueous polyurethane wastewater flotation recovery device according to claim 1, characterized in that: Two waste liquid input devices (115) are fixedly provided on both sides of the outer end face of the outer shell (101) of the recycling device, and the waste liquid input devices (115) on both sides are symmetrically arranged.

7. The aqueous polyurethane wastewater flotation recovery device according to claim 6, characterized in that: The waste liquid input device (115) is provided with an outward-facing primary filter tank (111), and a primary filter plate (112) is installed in the primary filter tank (111). The other side of the input pipe (114) is installed and connected to the bottom of the waste liquid input device (115) and communicates with the bottom of the primary filter tank (111).

8. The aqueous polyurethane wastewater flotation recovery device according to claim 7, characterized in that: The waste liquid input device (115) is connected to a waste liquid input pipe (113) on one side of its top end.

9. The aqueous polyurethane wastewater flotation recovery device according to claim 1, characterized in that: The bottom of the waste liquid filtration chamber (108) is connected to two clean water pipes (116), which are symmetrically arranged and used to output the filtered clean water.

10. The aqueous polyurethane wastewater flotation recovery device according to claim 9, characterized in that: A filter sleeve (118) is installed at the bottom of the waste liquid filtration chamber (108) and outside the opening of the clean water pipe (116). A secondary filter plate (119) is installed at the top of the filter sleeve (118).

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