A kind of fruit juice processing adsorption section resin regeneration flushing device

Abstract

This utility model relates to the field of resin regeneration technology, specifically a resin regeneration rinsing device for the adsorption section of a juice processing plant. It includes a base plate and a resin column, a water tank, and a regeneration liquid tank mounted on the base plate, as well as a heat pump mounted on the base plate. The water tank is connected to the bottom of the resin column via a first pipe, and the regeneration liquid tank is connected to the upper end of the resin column via a second pipe. The heat pump is connected to both the water tank and the regeneration liquid tank. A water inlet pipe is provided at the upper end of the resin column. This utility model adds a temperature control system consisting of a heat pump and a detachable spiral coil inside the tank cover. A three-way switching valve allows for precise temperature adjustment of the backwash water in the water tank and the regeneration liquid in the regeneration liquid tank, effectively solving the problems of low regeneration efficiency and resin adsorption performance degradation caused by the lack of a temperature control module. Precise temperature control ensures efficient desorption of pigments and polyphenols from the resin surface by the regeneration liquid while avoiding high-temperature damage to the resin structure, resulting in a resin adsorption capacity recovery rate of over 95% after regeneration and extending the resin's service life.

Description

Technical Field

[0001] This utility model relates to the field of resin regeneration technology, specifically to a resin regeneration and rinsing device for the adsorption section of fruit juice processing. Background Technology

[0002] In fruit juice processing, macroporous adsorption resin is the core equipment for achieving efficient separation of pigments and polyphenolic impurities. The recovery of its adsorption performance depends on the regeneration and rinsing process. The regeneration efficiency and effect directly determine the cost of resin recycling, which in turn affects the purity, flavor stability and economic benefits of fruit juice products.

[0003] For example, Chinese patent CN205570348U discloses an automatic regeneration device for macroporous adsorption resin. This device supplies regeneration solution and backwash water separately through a regeneration solution storage tank and a backwash water tank. Combined with an online spectral COD detection device and a control box, it achieves real-time monitoring of the COD concentration of the regeneration solution and automatic adjustment of the flow rate, effectively avoiding excessive use of regeneration solution and backwash water, and providing a technical approach for the automated control of resin regeneration. However, this device focuses on wastewater treatment, and its structural design and functional configuration cannot adapt to the specific needs of juice processing, specifically exhibiting the following shortcomings: 1. Lack of temperature control module: The device does not have a temperature regulation structure for the regenerated liquid / backwash water. In juice processing, resin regeneration requires high temperature precision (e.g., the ethanol regenerated liquid needs to be kept stable at 40-50℃ to ensure pigment desorption efficiency, while avoiding temperature fluctuations that could lead to a decline in resin adsorption performance). Regeneration processes at room temperature or without temperature control will reduce the regeneration effect and affect the quality of subsequent juice impurity separation.

[0004] 2. The device discharges the regenerated waste liquid into a wastewater collection tank without designing a dedicated recycling channel for the food-grade ethanol regenerator commonly used in juice processing. This results in ethanol being discharged with the wastewater, which not only wastes regenerator resources and increases production costs, but also increases environmental costs due to the need for additional treatment of high-concentration ethanol waste liquid.

[0005] 3. The device uses a one-way flow of regenerated liquid and backwash water from the bottom of the resin tank. It does not take into account the clogging problem that may occur in the resin layer during juice processing due to the retention of pectin and juice residue. The single flow direction is difficult to effectively wash away the suspended matter remaining in the resin layer, which may lead to poor resin adsorption channels after regeneration and affect the subsequent use effect. Utility Model Content

[0006] The purpose of this invention is to provide a resin regeneration and rinsing device for the adsorption section of fruit juice processing, which solves the problems mentioned in the prior art in the background section.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a resin regeneration and rinsing device for the adsorption section of a juice processing plant, comprising a base plate and a resin column, a water tank, and a regeneration liquid tank disposed on the base plate, and further comprising a heat pump disposed on the base plate; the water tank is connected to the bottom of the resin column through a first pipeline, the regeneration liquid tank is connected to the upper end of the resin column through a second pipeline, the heat pump is connected to the water tank and the regeneration liquid tank respectively, and the upper end of the resin column is provided with a water inlet pipe.

[0008] Furthermore, both the water tank and the regenerated liquid tank include a tank body and a cover detachably connected to the tank body; a spiral coil located inside the tank cover is detachably connected to the tank cover, and the inlet and outlet of the two spiral coils are connected to the outlet and inlet of the heat pump through a three-way switching valve.

[0009] Furthermore, centrifugal pumps are installed on both the first and second pipelines.

[0010] Furthermore, the base plate is also provided with a sedimentation tank and a recovery cylinder; the upper end of the resin column is provided with a first water outlet pipe, the lower end of the resin column is provided with a second water outlet pipe and a regenerated liquid recovery pipe, the outlet ends of the first water outlet pipe and the second water outlet pipe are both located in the sedimentation tank, and the outlet end of the regenerated liquid recovery pipe is located in the recovery cylinder.

[0011] Furthermore, a water supply pipe is provided on the lid of the container.

[0012] Furthermore, valves are installed at the inlet and outlet of the first pipeline, the second pipeline, the inlet pipe, the first outlet pipe, the second outlet pipe, the regenerated liquid recovery pipe, the water replenishment pipe, and the heat pump.

[0013] This utility model addresses the shortcomings of existing technologies by optimizing the structure and innovating the function, specifically offering the following advantages: 1. This utility model addresses the food safety requirements of fruit juice processing by specifically designing the materials of core components and the fluid contact structure. For example, the base plate, resin column, water tank, regenerated liquid tank, and all pipelines are made of 304 or 316L food-grade stainless steel, the tank cover sealing gasket is made of heat-resistant food-grade silicone rubber, and the connection parts of the water supply pipe, water inlet pipe, etc. are made of food-grade sealing tape. This avoids the risk of migration and contamination that may be caused by the use of industrial-grade materials and agents, and ensures the food safety of the regeneration process and subsequent fruit juice processing.

[0014] 2. This utility model incorporates a temperature control system consisting of a heat pump and a detachable spiral coil inside the tank cover. A three-way switching valve allows for precise temperature regulation of the backflushing water in the water tank and the regenerated liquid in the regenerated liquid tank (backflushing water temperature control 50-60℃, regenerated liquid temperature control 40-50℃). Temperature fluctuations can be controlled within ±0.5℃, effectively solving the problems of low regeneration efficiency and resin adsorption performance degradation caused by the lack of a temperature control module. Precise temperature control ensures efficient desorption of pigments and polyphenols from the resin surface by the regenerated liquid (such as food-grade ethanol) while preventing high temperatures from damaging the resin structure. This results in a resin adsorption capacity recovery rate of over 95% after regeneration, extending the resin's service life.

[0015] 3. This utility model features a separate regenerated liquid recovery cylinder on the base plate, directly connected to the bottom of the resin column via a regenerated liquid recovery pipe. This allows for the specialized collection of waste liquid containing food-grade ethanol during the regeneration process. After subsequent distillation and purification, the ethanol recovery rate can reach over 85%. Simultaneously, a sedimentation tank is used to treat backwash wastewater and residual regenerated liquid rinsing wastewater, ensuring compliant discharge of the supernatant or further filtration and reuse. This reduces waste of regenerator resources, lowers raw material procurement costs, avoids the environmental challenges of treating high-concentration ethanol waste liquid, alleviates the environmental pressure on enterprises, and meets the requirements of green production.

[0016] 4. This invention employs a bidirectional flow rinsing and regeneration design. Backwash water is pumped into the resin column from the bottom through the first pipe, flowing upwards through the resin layer. This flushes away suspended solids such as pectin and fruit juice residue trapped within the resin layer, solving the problem of resin layer blockage that can easily occur with a single flow direction. The regeneration solution is pumped into the resin column from the top through the second pipe, penetrating the resin layer from top to bottom, ensuring full contact between the regeneration solution and the resin. This bidirectional flow design, combined with the stable pressure supply of a centrifugal pump, ensures both the cleaning effect of backwashing and improves the desorption efficiency of the regeneration solution. This prevents incomplete regeneration from causing a decrease in the subsequent separation of fruit juice impurities, thus guaranteeing the quality of resin regeneration and the stability of subsequent use. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the present utility model; Figure 2 This is a partial sectional view of the present invention; Figure 3 This is a rear view of the present invention; Figure 4 This is a top view of the present invention.

[0018] In the diagram: 1. Base plate; 2. Resin column; 3. Water tank; 4. Regenerated liquid tank; 5. Heat pump; 6. First pipeline; 7. Second pipeline; 8. Inlet pipe; 9. Tank body; 10. Tank cover; 11. Spiral coil; 12. Three-way switching valve; 13. Centrifugal pump; 14. Sedimentation tank; 15. Recovery cylinder; 16. First outlet pipe; 17. Second outlet pipe; 18. Regenerated liquid recovery pipe; 19. Make-up water pipe; 20. Valve. Detailed Implementation

[0019] To make the purpose and technical solution of this utility model clearer, the following description is provided in conjunction with the appendix. Figure 1-4 The present invention will be further described in detail below with specific embodiments. The present invention discloses a resin regeneration and rinsing device for the adsorption section of a juice processing plant. The core structure uses a base plate 1 as the mounting base. The base plate 1 is made of 304 stainless steel with a thickness of 8-12mm to ensure load-bearing strength. A resin column 2, a water tank 3, a regenerated liquid tank 4, a heat pump 5, a sedimentation tank 14, and a recovery cylinder 15 are fixed to the base plate 1 by bolts (M10-M12 bolts, spacing 200-300mm, with anti-loosening washers). All components are connected to valves 20 via food-grade stainless steel pipelines (pipe diameter designed according to flow requirements, DN25-DN50) to form a complete resin regeneration and rinsing system.

[0020] The resin column 2 is a vertical cylindrical shape, made of 304 stainless steel, with an inner diameter of 300-500mm, a height of 1500-2000mm, and a wall thickness of 5-8mm. Flanges (nominal pressure 1.0MPa, raised face sealing surface) are welded to both the upper and lower ends of the column. The upper flange connects to the second pipe 7, the inlet pipe 8, and the first outlet pipe 16, while the lower flange connects to the first pipe 6, the second outlet pipe 17, and the regenerated liquid recovery pipe 18. Specifically... One end of the inlet pipe 8 is connected to the pre-reserved interface on the upper side of the resin column 2 via a flange (a food-grade silicone rubber sealing gasket is installed between the flanges), and the other end extends to the outside of the device for connecting to the cleaning water source. One end of the first outlet pipe 16 is welded to the other side of the upper end of the resin column 2, and polished after welding (roughness Ra≤0.8μm). The other end is fixed with a pipe clamp and extends into the sedimentation tank 14, with the outlet end 50-100mm from the bottom of the sedimentation tank 14. The second outlet pipe 17 and the regenerated liquid recovery pipe 18 are both welded to the side of the bottom end of the resin column 2, distributed at a 90° angle. The outlet end of the second outlet pipe 17 extends into the sedimentation tank 14 (at the same height as the first outlet pipe 16), and the outlet end of the regenerated liquid recovery pipe 18 extends into the recovery cylinder 15, 30-50mm from the bottom of the recovery cylinder 15.

[0021] One end of the first pipeline 6 is connected to the bottom outlet of the water tank 3 via a flange, and the other end is connected to the center inlet at the bottom of the resin column 2 via a flange. A centrifugal pump 13 is connected in series in the middle of the pipeline. The inlet and outlet of the centrifugal pump 13 are both connected to the corresponding ports of the pipeline via flanges (flange bolts are tightened diagonally, with torque controlled at 25-30 N·m). A food-grade horizontal centrifugal pump with a flow rate of 10-20 m³ / h is selected. 3 / h, head 15-25m. One end of the second pipeline 7 is connected to the bottom outlet of the regenerated liquid tank 4 through a flange, and the other end is connected to the center inlet of the upper end of the resin column 2 through a flange. The same type of centrifugal pump 13 is connected in series in the middle of the pipeline, and the connection method is the same as that of the first pipeline 6.

[0022] Water tank 3 and regenerated liquid tank 4 have the same structure, both including a tank body 9 and a tank cover 10. The tank body 9 is cylindrical, made of 304 stainless steel, and has a volume of 0.5-1 m³. 3 The top has an opening with a flange welded to the edge of the opening; the cover 10 is also made of stainless steel and is detachably connected to the top flange of the body 9 by bolts (bolt spacing 80-100mm). A heat-resistant food-grade gasket (temperature range -20℃-120℃) is installed between the flanges to facilitate subsequent disassembly and maintenance. The inner side of the cover 10 is detachably connected to a spiral coil 11 via clips (4-6 clips made of food-grade PP, evenly distributed). The spiral coil 11 is made of 316L stainless steel, with a diameter of DN15-DN20 and 5-8 turns to ensure full contact with the liquid inside the tank. The inlet ends of the two spiral coils 11 are connected to a three-way switching valve 12, which is connected to the outlet of the heat pump 5 via a thread (thread specification G1 / 2, with PTFE sealing tape). The outlet end of the spiral coil 11 is also connected to another three-way switching valve 12, which is connected to the inlet of the heat pump 5 via a thread. The heat pump 5 is an air source heat pump or a water source heat pump with a heating capacity of 5-10kW and an adjustable outlet water temperature range of 30℃-80℃. Heat circulation is achieved through the three-way switching valve 12. An interface is also reserved in the center of the cover 10. One end of the water supply pipe 19 is sealed to the interface by a thread (3-5 turns of sealing tape are wrapped around the thread), and the other end extends to the outside of the device. The pipe diameter is DN20-DN25, which is used to replenish water or regeneration liquid into the tank.

[0023] Valves 20 are installed at the inlet and outlet of the first pipeline 6, the second pipeline 7, the inlet pipe 8, the first outlet pipe 16, the second outlet pipe 17, the regenerated liquid recovery pipe 18, the makeup water pipe 19, and the inlet and outlet of the heat pump 5. Valves 20 are food-grade stainless steel gate valves or ball valves with a nominal pressure of 1.0 MPa. Valves 20 on the first pipeline 6 and the second pipeline 7 are installed on one side of the centrifugal pump 13, 100-150 mm from the flange of the centrifugal pump 13, facilitating liquid shut-off during centrifugal pump 13 maintenance. Valves 20 on the inlet pipe 8 and the makeup water pipe 19 are installed close to the pipe inlet, 50-80 mm from the outlet. Valves 20 at the inlet and outlet of the heat pump 5 are directly connected to the heat pump 5 interface via flanges to ensure sealing. All valve 20 operating handles face the same direction (upward or to the side) for easy unified control by operators.

[0024] The working process of this utility model: 1. Close valves 20 on inlet pipe 8, second pipe 7, and regenerated liquid recovery pipe 18. Open valves 20 on outlet of water tank 3, first pipe 6, second outlet pipe 17, and top vent valve (if required) of sedimentation tank 14. Start heat pump 5, set target water temperature 50-60℃, and connect heat pump 5 to spiral coil 11 located in water tank 3 through three-way switching valve 12. Heat pump 5 transfers heat to spiral coil 11 in water tank 3 for heat exchange with water in water tank 3. After the water temperature reaches the set value (monitored by a thermometer installed on the side wall of water tank 3 with an accuracy of ±0.5℃), start centrifugal pump 13 on first pipe 6. Centrifugal pump 13 pumps water from water tank 3 into resin column 2 from the bottom through first pipe 6. The water flows from bottom to top through the resin layer (the resin is macroporous adsorption resin with a particle size of 0.3-1.2 mm and a filling height of 2 / 3-3 / 4 of the height of resin column 2). The flow rate is controlled at 1-2 BV / h (BV is the volume of resin column). The expansion rate of the resin layer is 30%-50%, which flushes up the fruit juice residue, pectin and other suspended solids trapped in the resin layer. The flushing wastewater is discharged into sedimentation tank 14 through the first outlet pipe (16) at the top of resin column 2. The sedimentation tank 14 has a volume of 1-2 m³. 3 The sedimentation tank (14) is equipped with inclined tube packing (PP material, 60° inclination). The wastewater stays in the sedimentation tank (14) for 30-60 minutes, and the suspended solids settle naturally. The supernatant can be discharged through the outlet of the sedimentation tank (14) (further filtration can be performed if reuse is required). The backwashing continues until the supernatant flowing out of the outlet of the sedimentation tank (14) is clear (turbidity < 5 NTU). The centrifugal pump (13) and heat pump (5) are turned off, and the relevant valves (20) are closed to complete the backwashing.

[0025] 2. Open valve 20 on the water supply pipe 19 of the regenerated liquid tank 4, and inject regenerated liquid (food-grade ethanol, concentration 50%-80%, dosage 2-3 BV) into the regenerated liquid tank 4 through the water supply pipe 19. After injection, close valve 20 on the water supply pipe 19. Connect heat pump 5 to spiral coil 11 located in the regenerated liquid tank 4 through three-way switching valve 12, start heat pump 5, set the target water temperature to 40-50℃, and heat the regenerated liquid in the regenerated liquid tank 4 through spiral coil 11. After the temperature reaches the set value, turn off heat pump 5. Open valves 20 on the outlet of regenerated liquid tank 4, the second pipeline 7, the regenerated liquid recovery pipe 18, and the top exhaust valve of the recovery cylinder 15; start the centrifugal pump 13 on the second pipeline 7 to pump the regenerated liquid at 40-50℃ from the top of the resin column 2 through the second pipeline 7, controlling the flow rate at 0.5-1.5 BV / h. The regenerated liquid permeates the resin layer from top to bottom, competing with impurities such as pigments (e.g., anthocyanins, flavonoids), and polyphenols adsorbed on the resin surface through hydrophobic interactions. The impurities desorb from the resin surface and enter the regenerated liquid; the regenerated liquid containing impurities flows into the recovery cylinder 15 through the regenerated liquid recovery pipe 18 at the bottom of the resin column 2. The recovery cylinder 15 is cylindrical with a volume of 0.5-1 m³. 3 Made of 304 stainless steel, with a drain valve at the bottom; after collecting 0.5 BV of regenerated liquid, a sample is taken to test its absorbance (420 nm wavelength). When the absorbance is <0.05, it indicates that the impurities have been basically desorbed. The centrifugal pump 13 is turned off and the relevant valve 20 is closed to complete the regenerated liquid washing; the regenerated liquid in the recovery cylinder 15 can be subsequently purified by distillation (ethanol recovery rate of over 85%) to achieve recycling.

[0026] 3. Open the inlet pipe 8, the first outlet pipe 16, and the relevant valves 20 of the sedimentation tank 14; introduce room temperature food-grade pure water (conductivity <10μS / cm) into the upper end of the resin column 2 through the inlet pipe 8. The water flows from top to bottom through the resin layer to rinse the residual regeneration liquid on the resin surface. The flow rate is controlled at 1-2 BV / h. The rinsing wastewater is discharged into the sedimentation tank 14 through the second outlet pipe (17) at the upper end of the resin column 2. During the continuous rinsing process, the ethanol concentration (using an alcohol concentration meter, accuracy ±0.1%) and pH value (pH meter accuracy ±0.01) of the wastewater at the outlet of the sedimentation tank 14 are sampled and tested periodically. When the ethanol concentration of the wastewater is <0.1% and the pH is stable at 6.5-7.5, close the valve 20 of the inlet pipe 8 to complete the removal of residual regeneration liquid.

[0027] 4. Open valves 20 on the outlet of water tank 3, the first pipe 6, and the second outlet pipe 17. Start the centrifugal pump 13 on the first pipe 6 to pump room temperature clean water (unheated) from the water tank 3 into the resin column 2 through the first pipe 6. The water flows from bottom to top through the resin layer at a rate of 0.5-1 BV / h to wet and balance the resin, while rinsing away any remaining impurities from the cleaning water. After balancing for 15-20 minutes, turn off the centrifugal pump 13 and close all valves 20. Take a sample to test the conductivity (<5μS / cm) and pH (6.5-7.5) of the water at the outlet of resin column 2. Once the standards are met, the resin in resin column 2 will regain its adsorption capacity and be ready for the next round of juice adsorption (juice flows in from the top of resin column 2 and out from the bottom outlet, achieving the adsorption of pigments and impurities).

[0028] This invention ensures stable operation of the device by clearly defining the specific connection methods and operating parameters of each component, achieving efficient regeneration of the resin in the adsorption section of the juice processing. After regeneration, the resin adsorption capacity recovery rate reaches over 95%, and the device is easy to operate and has low maintenance costs, meeting the requirements for food-grade processing.

Claims

1. A fruit juice processing adsorption section resin regeneration flushing device, comprising a base plate (1) and a resin column (2), a water tank (3), and a regeneration liquid tank (4) arranged on the base plate (1), characterized in that, It also includes a heat pump (5) installed on the base plate (1); the water tank (3) is connected to the bottom of the resin column (2) through the first pipe (6), the regenerated liquid tank (4) is connected to the upper end of the resin column (2) through the second pipe (7), the heat pump (5) is connected to the water tank (3) and the regenerated liquid tank (4) respectively, and the upper end of the resin column (2) is provided with a water inlet pipe (8).

2. The regenerative flushing device of claim 1, wherein Both the water tank (3) and the regenerated liquid tank (4) include a tank body (9) and a cover (10) detachably connected to the tank body (9); a spiral coil (11) located inside the cover (10) is detachably connected to the cover (10), and the inlet and outlet of the two spiral coils (11) are connected to the outlet and inlet of the heat pump (5) through a three-way switching valve (12).

3. The regenerative flush device of claim 2, wherein, Centrifugal pumps (13) are installed on both the first pipeline (6) and the second pipeline (7).

4. The regenerative flush device of claim 3, wherein, The base plate (1) is also provided with a sedimentation tank (14) and a recovery cylinder (15); the upper end of the resin column (2) is provided with a first water outlet pipe (16), the lower end of the resin column (2) is provided with a second water outlet pipe (17) and a regenerated liquid recovery pipe (18), the outlet ends of the first water outlet pipe (16) and the second water outlet pipe (17) are both located in the sedimentation tank (14), and the outlet end of the regenerated liquid recovery pipe (18) is located in the recovery cylinder (15).

5. The regenerative flush device of claim 2, wherein, The box cover (10) is equipped with a water supply pipe (19).

6. The regenerative flush device of claim 5, wherein, Valves (20) are provided at the inlet and outlet of the first pipeline (6), the second pipeline (7), the inlet pipe (8), the first outlet pipe (16), the second outlet pipe (17), the regenerated liquid recovery pipe (18), the water replenishment pipe (19), and the heat pump (5).

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