Casein acid whey desalting device and method

Abstract

The invention belongs to the technical field of acid whey desalination, and particularly discloses a casein acid whey desalination device and method.The casein acid whey desalination device comprises a pretreatment system, a nanofiltration system, an electrodialysis and ion exchange system, a pH value adjusting system, a milk bin system and a concentrated material crystallization system, two filtering tanks are arranged between the stock solution tank and the filtrate tank; by arranging the nanofiltration system, the whey liquid can be preliminarily filtered under the action of the filtering assembly, and the nanofiltration system is matched with a subsequent nanofiltration membrane to realize a multi-filtering effect, so that the filtering and concentrating effects on the material are effectively enhanced, the solid content of the concentrated material is relatively high, and the requirements of concentration and conductivity are met; in addition, in the back-flushing cleaning process through the back-flushing module, the back-flushing pressure can be reduced by adjusting the filter holes, and the situation that the follow-up using effect is affected by mechanical abrasion of the inner walls of the filter holes due to the fact that the pressure needed by traditional back-flushing is large is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of acid whey desalination, and specifically discloses a casein acid whey desalination device and method. Background Art

[0002] D90 desalted whey powder plays an important role in milk powder. In the ingredient list of milk powder, we often see ingredients such as raw cow / goat milk, skim milk / skim milk powder, skim goat milk powder, concentrated whey protein powder and desalted whey powder. Among them, desalted whey powder, as a high-quality whey product, can be divided into multiple grades such as D40, D50, D70 and D90 according to its degree of desalination. At present, desalted whey powder mainly uses nanofiltration equipment to filter the whey during the production process. After long-term use, it will be cleaned by backflushing to avoid clogging of the filter holes. However, due to the clogging of some filter holes, the backflushing liquid needs to use a higher pressure, which is easy to cause mechanical wear of the filter holes and lead to poor subsequent filtration effect. Summary of the invention

[0003] In view of this, the purpose of the present invention is to propose a casein acid whey desalination device and method to solve the problem in the prior art that some filter holes are blocked, the backwash liquid needs to use a higher pressure, which easily causes mechanical wear of the filter holes and leads to poor subsequent filtration effect.

[0004] To achieve the above objectives, the present invention provides a casein acid whey desalination device, comprising a pretreatment system, a nanofiltration system, an electrodialysis and ion exchange system, a pH value adjustment system, a milk silo system and a concentrated material crystallization system. The nanofiltration system comprises a raw liquid tank and a filtrate tank, two filter tanks are arranged between the raw liquid tank and the filtrate tank, a connecting shell is arranged between the filter tank and the filtrate tank, a nanofiltration membrane is arranged inside the connecting shell, a filtration mechanism is arranged inside the filter tank, and a backwash module is arranged at the bottom of the filtrate tank; The bottom of the raw liquid tank is connected to a first pump body, the liquid outlet end of the first pump body is connected to a first electric three-way valve, one end of the first electric three-way valve is connected to a discharge pipe, the other end of the first electric three-way valve is connected to a second electric three-way valve, and both ends of the second electric three-way valve are connected to an introduction pipe connected to the filter tank; One side of the filter tank is connected to a derivation pipe connected to the filtrate tank, the bottom of the filter tank is connected to a second pump body, the liquid outlet end of the second pump body is connected to the water inlet end of the nanofiltration membrane, the concentrated liquid outlet end of the nanofiltration membrane is connected to a reflux pipe connected to the raw liquid tank, and the filtrate outlet end of the nanofiltration membrane is connected to an inlet pipe connected to the filtrate tank.

[0005] In the above technical solution, preferably, the filtering mechanism comprises a mounting plate fixedly connected to the inside of the filter tank, the surface of the mounting plate is provided with evenly distributed filter holes, and the mounting plate divides the inside of the filter tank into a concentration chamber and a filtrate chamber; Wherein, the liquid inlet end of the second pump body is connected with the concentration chamber, and the outlet pipe is connected with the filtrate chamber.

[0006] In the above technical solution, preferably, two symmetrically distributed regulating capsules are embedded and installed on the inner wall of the filter hole, a fixing rod is coaxially arranged inside the filter hole, and evenly distributed fixing tubes are arranged on the surface of the fixing rod, and an adjusting sleeve is slidably connected to the surface of the fixing tube, and the other end of the adjusting sleeve is fixedly connected to the surface of the adjacent regulating capsule, and a filter membrane is embedded and installed on one end of the regulating capsule close to the introduction tube.

[0007] In the above technical solution, preferably, a sliding cavity is opened inside the fixing rod, the inner wall of the sliding cavity is slidably connected with the sliding rod, connecting holes are opened at both ends of the fixing rod, and the fixing tube is connected to the sliding cavity.

[0008] In the above technical solution, preferably, an inlet hole is provided at one end of the sliding rod away from the inlet tube, through holes are evenly distributed and corresponding to the fixed tube are provided on the surface of the sliding rod, grooves are staggered with the through holes are provided on the surface of the sliding rod, and discharge channels are evenly distributed on the surface of the sliding rod, and the three grooves are connected through the discharge channel.

[0009] In the above technical solution, preferably, the inner wall of the concentration chamber is rotatably connected with two rotating shafts, the surface of the rotating shafts is fixedly connected with evenly distributed blades, and one end of the two rotating shafts passes through the filter tank and is provided with a transmission mechanism.

[0010] In the above technical solution, preferably, the backwash module includes a third pump body arranged at the bottom of the filtrate tank, the liquid inlet end of the third pump body is connected to the filtrate tank, the liquid outlet end of the third pump body is connected to an injection pipe, the other end of the injection pipe is connected to a third electric three-way valve, both ends of the third electric three-way valve are connected to a backwash pipe, and the backwash pipe is connected to the filtrate chamber.

[0011] In the above technical solution, preferably, a drain pipe communicating with the concentration chamber is provided on the surface of the filter tank, and a solenoid valve is provided on the surface of the drain pipe.

[0012] In the above technical solution, preferably, a pH sensor is provided inside the concentration chamber, pressure sensors are provided inside the concentration chamber and the filtrate chamber, and two adjustment components are provided on the top of the filter tank.

[0013] A method for desalting casein acid whey comprises the following steps: S1. Acid whey pretreatment: In the casein workshop, the acid whey is pumped into the whey temporary storage tank after passing through the plate frame to sterilize the raw materials. The sterilized materials are premixed to prevent the index difference from being too large. The premixed materials can be directly pumped into the nanofiltration system for treatment; S2. After the raw material pretreatment, the microbial index and turbidity index of the material meet the conditions for entering the nanofiltration system, and then it can enter the nanofiltration system. After being filtered by the nanofiltration system, the concentrated liquid is further processed in the electrodialysis system after being heated; S3. After electrodialysis desalination, the material that meets the conductivity is sent to the electrodialysis temporary storage tank to wait for the ion exchange system to feed the material. The outlet is equipped with a cooling plate heat exchanger. After cooling to 15 degrees Celsius, it is sent to the ion exchange system to prevent the growth of microorganisms. After electrodialysis and ion exchange, it is introduced into the pH adjustment system for pH adjustment; S4, the desalted whey liquid is transported to the milk warehouse system of the milk powder workshop, and enters through the milk collection system pipeline. All are completed using the original system. The pasteurizer is sterilized at 85℃. After sterilization, it is transported to other milk warehouses to wait for the protein coefficient to be adjusted, and the evenly mixed materials are sent to the evaporator for concentration; S5. The evaporator cools the concentrated whey liquid and pumps it into the crystallization tank system with pressure, waiting for crystallization. During the crystallization process, stirring is started and the crystallization time is 3 hours. The change in material concentration is observed to confirm the crystallization situation. The crystallization discharge is equipped with a sanitary rotor pump, an online tubular heater, and a shear emulsifying pump, and sent to the original concentrated milk system for spray drying.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By setting up a nanofiltration system, the whey liquid can be initially filtered under the action of the filtering component, and the subsequent nanofiltration membrane can be used to achieve multiple filtering effects, effectively enhancing the filtering and concentration effect of the material, so that the solid content of the concentrated material is higher and meets the concentration and conductivity requirements. In the process of backwashing cleaning using the backwash module, the backwashing pressure can be reduced by adjusting the filter holes, thereby reducing the mechanical wear of the inner wall of the filter hole caused by the high pressure required for traditional backwashing, which affects the subsequent use effect.

[0015] By setting up a filtering mechanism, the aperture of the filter holes can be guaranteed during the process of filtering the liquid under the action of the filtering mechanism, and a good filtering effect can be maintained. In the process of backwashing cleaning, the aperture of the filter holes can be expanded by adjusting the adjusting capsule, the backwashing effect can be improved, the backwashing pressure can be reduced, and a good backwashing effect can be achieved on the filter holes. The backwashing liquid is in the form of filtrate, which can effectively utilize the discharged filtrate and reduce the use cost. At the same time, the excess filtrate can be used to dilute the brine in the brine circuit of the electrodialysis.

[0016] By setting up the adjustment component and the pH sensor, the pH value of the concentrated liquid can be detected, and the pH value can be pre-adjusted in the concentrated liquid stage to reduce the subsequent adjustment pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the nanofiltration system of the present invention; Figure 2 It is a partial cross-sectional schematic diagram of the filter tank of the present invention; Figure 3 Schematic diagram of the distribution of filter holes of the present invention; Figure 4 It is a schematic diagram of the connection between the fixing rod and the adjusting capsule of the present invention; Figure 5 is a cross-sectional schematic diagram of a fixing rod of the present invention; Figure 6 It is a schematic diagram of the connection between the rotating shaft and the transmission mechanism of the present invention.

[0018] In the figure: 1. raw liquid tank; 101. first pump body; 102. first electric three-way valve; 103. discharge pipe; 104. second electric three-way valve; 105. inlet pipe; 2. filter tank; 201. second pump body; 202. adjustment component; 203. outlet pipe; 3. connecting shell; 301. reflux pipe; 4. filtrate tank; 401. discharge pipe; 402. injection pipe; 403. third pump body; 5. filtering mechanism; 501. mounting plate; 502. filter hole; 503. fixing rod; 504. adjusting sleeve; 505. adjusting capsule; 506. filter membrane; 507. sliding rod; 508. through hole; 509. connecting hole; 510. groove; 511. fixing pipe; 512. discharge channel; 513. inlet hole; 514. rotating shaft; 515. blade; 516. transmission mechanism. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] like Figure 1-Figure 6 The casein acid whey desalination device shown includes a pretreatment system, a nanofiltration system, an electrodialysis and ion exchange system, a pH value adjustment system, a milk silo system and a concentrated material crystallization system. The nanofiltration system comprises a raw liquid tank 1 and a filtrate tank 4, two filter tanks 2 are arranged between the raw liquid tank 1 and the filtrate tank 4, a connecting shell 3 is arranged between the filter tank 2 and the filtrate tank 4, a nanofiltration membrane is arranged inside the connecting shell 3, a filtering mechanism 5 is arranged inside the filter tank 2, and a backwash module is arranged at the bottom of the filtrate tank 4; The bottom of the raw liquid tank 1 is connected to a first pump body 101, the liquid outlet end of the first pump body 101 is connected to a first electric three-way valve 102, one end of the first electric three-way valve 102 is connected to a discharge pipe 103, the other end of the first electric three-way valve 102 is connected to a second electric three-way valve 104, and both ends of the second electric three-way valve 104 are connected to an introduction pipe 105 connected to the filter tank 2; One side of the filter tank 2 is connected with a derivation pipe 203 connected with the filtrate tank 4, the bottom of the filter tank 2 is connected with a second pump body 201, the liquid outlet end of the second pump body 201 is connected with the water inlet end of the nanofiltration membrane, the concentrated liquid outlet end of the nanofiltration membrane is connected with a reflux pipe 301 connected with the raw liquid tank 1, and the filtrate outlet end of the nanofiltration membrane is connected with an inlet pipe connected with the filtrate tank 4; The treated lactic acid serum is exported to the internal storage of the raw liquid tank 1, transported by the first pump body 101, and introduced into the interior of the filter tank 2 connected thereto through one of the inlet pipes 105 through the adjustment of the first electric three-way valve 102 and the second electric three-way valve 104. In this process, it is filtered by the filtering mechanism 5, and the filtrate produced after filtration can be directly introduced into the internal storage of the filtrate tank 4 through the export pipe 203, wherein the filtrate in the filtrate tank 4 can be used to dilute the brine in the brine circuit of the electrodialysis, and the concentrated liquid produced after filtration can be injected into the interior of the connecting shell 3 through the second pump body 201, and nanofiltration operation is performed under the action of the internal nanofiltration membrane, and the concentrated liquid produced can be guided back to the internal storage of the raw liquid tank 1 through the reflux pipe 301, and the filtrate is injected into the internal storage of the filtrate tank 4 through the inlet pipe for reuse.

[0022] like Figure 1-Figure 6 As shown, the filter mechanism 5 includes a mounting plate 501 fixedly connected to the inside of the filter tank 2, and the surface of the mounting plate 501 is provided with filter holes 502 evenly distributed. The mounting plate 501 divides the inside of the filter tank 2 into a concentration chamber and a filtrate chamber; The liquid inlet end of the second pump body 201 is connected to the concentration chamber, and the outlet pipe 203 is connected to the filtrate chamber.

[0023] Two symmetrically distributed regulating capsules 505 are embedded in the inner wall of the filter hole 502, a fixing rod 503 is coaxially arranged inside the filter hole 502, and evenly distributed fixing tubes 511 are arranged on the surface of the fixing rod 503. An adjusting sleeve 504 is slidably connected to the surface of the fixing tube 511, and the other end of the adjusting sleeve 504 is fixedly connected to the surface of the adjacent regulating capsule 505. A filter membrane 506 is embedded in the end of the regulating capsule 505 close to the introduction tube 105.

[0024] A sliding cavity is provided inside the fixing rod 503 , and a sliding rod 507 is slidably connected to the inner wall of the sliding cavity. Connecting holes 509 are provided at both ends of the fixing rod 503 , and the fixing tube 511 is connected to the sliding cavity.

[0025] An inlet hole 513 is provided at one end of the sliding rod 507 away from the inlet tube 105, and through holes 508 that are evenly distributed and correspond to the fixed tube 511 are provided on the surface of the sliding rod 507. Grooves 510 that are staggered with the through holes 508 are provided on the surface of the sliding rod 507. Discharge channels 512 are evenly distributed on the surface of the sliding rod 507, and the three grooves 510 are connected through the discharge channels 512.

[0026] During the filtering process, the liquid flows from the concentration chamber to the filtrate chamber. In this process, the filter hole 502 can be used to intercept the desired substance, and water and inorganic salts can pass through the filter hole 502 into the filtrate chamber. In the filtering process, the liquid can be injected into the sliding chamber through the connecting hole 509 due to the flow direction of the liquid, and the end of the sliding rod 507 away from the introduction tube 105 is pushed to be close to the inner wall of the sliding chamber by the injection of the liquid. At this time, the through hole 508 and the fixed tube 511 are staggered, and the fixed tube 511 can be connected with the discharge channel 512 through the groove 510, and the filtration of the filter membrane 506 can keep the water injected into the regulating capsule 505 in a bulging state, see Figure 4 The regulating capsule 505 is in a bulging state, and at this time, the aperture of the filter hole 502 can be maintained to produce a good filtering effect; During the backwashing process using the backwashing module, the flow direction of the liquid changes, and the liquid can be injected from another connecting hole 509 on the fixed rod 503. Before backwashing, due to filtration, one end of the sliding rod 507, that is, the end with the introduction hole 513, is in close contact with the inner wall of the sliding cavity. The liquid injected through the connecting hole 509 can enter the interior of the introduction hole 513 and fill the introduction hole 513, and then push the sliding rod 507 to slide along the inner wall of the sliding cavity until it contacts the inner wall on the other side and stops. At this time, the through hole 508 is connected with the fixed tube 511, and the subsequently injected liquid can be injected into the interior of the fixed tube 511 through the through hole 508, thereby pushing the regulating sleeve 504 to squeeze the regulating capsule 505, so that the regulating capsule 505 shrinks and discharges the liquid stored inside into the concentration cavity. In this process, the aperture of the filter hole 502 can be enlarged, the backwashing effect can be improved, the backwashing pressure can be reduced, and a good backwashing effect can be achieved for the filter hole 502. Compared with the traditional trumpet-shaped filter port, this method can adjust the inner diameter of the filter hole 502 to avoid impurities clogging it tightly after long-term use, which is not conducive to backflushing cleaning. At the same time, it reduces the pressure required for backflushing cleaning and reduces the mechanical wear on the inner side of the filter hole 502 caused by the high backflushing pressure. During the backflushing process, the inner diameter of the filter hole 502 is increased to separate the clogged impurities from the inner wall of the filter hole 502, so that the filter hole 502 can be cleaned under relatively low pressure. It also avoids the wear caused by the impurities and the filter hole 502 being too close to each other during the backflushing process of the traditional trumpet-shaped filter port, thereby effectively improving the service life of the filter hole 502.

[0027] After backwashing is completed, during the re-filtration process, as the position of the sliding rod 507 changes and the regulating bag 505 swells again, it can drive the regulating sleeve 504 to reset and discharge the liquid stored inside into the filtrate chamber through the fixed tube 511, the groove 510 and the discharge channel 512 through the connecting hole 509.

[0028] like Figure 1-Figure 6 As shown, the inner wall of the concentration chamber is rotatably connected with two rotating shafts 514, and the surface of the rotating shafts 514 is fixedly connected with evenly distributed blades 515. One end of the two rotating shafts 514 passes through the filter tank 2 and is provided with a transmission mechanism 516; Among them, the transmission mechanism 516 is a relatively mature technical means in the existing technical application, which is composed of two transmission wheels and a transmission belt. By driving one of the transmission wheels to rotate, the other transmission wheel can be driven to rotate synchronously under the action of the transmission belt.

[0029] The injected liquid can push the blades 515 to rotate the shaft 514, thereby driving the other shaft 514 to rotate synchronously under the action of the transmission mechanism 516. In this process, the blades 515 can be used to enhance the flow of liquid inside the concentration chamber, so that it can be better filtered through the filter holes 502, thereby improving the filtering effect.

[0030] like Figure 1-Figure 6 As shown, the backwash module includes a third pump body 403 arranged at the bottom of the filtrate tank 4, the liquid inlet end of the third pump body 403 is connected to the filtrate tank 4, the liquid outlet end of the third pump body 403 is connected to the injection pipe 402, the other end of the injection pipe 402 is connected to the third electric three-way valve, both ends of the third electric three-way valve are connected to the backwash pipe, and the backwash pipe is connected to the filtrate chamber.

[0031] A drain pipe 401 communicating with the concentration chamber is disposed on the surface of the filter tank 2 , and a solenoid valve is disposed on the surface of the drain pipe 401 .

[0032] A pH sensor is arranged inside the concentration chamber, pressure sensors are arranged inside the concentration chamber and the filtrate chamber, and two adjusting components 202 are arranged on the top of the filter tank 2 .

[0033] The third pump body 403 is used to extract the filtrate stored in the filtrate tank 4 and inject it into the filtrate chamber through the injection pipe 402, the third electric three-way valve and the backwash pipe, so as to backwash the filtrate into the concentration chamber to achieve the effect of backwashing and cleaning the filter holes 502. The waste liquid after backwashing and cleaning is discharged through the drain pipe 401; The first electric three-way valve 102 , the second electric three-way valve 104 and the third electric three-way valve are all relatively mature technical means in the existing technical applications, which can be used to switch the flow direction of the pipeline liquid, and will not be described in detail here.

[0034] The regulating component 202 includes an injection tube, a flow meter, a solenoid valve and an injection head. The two regulating components 202 are respectively used for the injection of acid and alkali agents, and can be used to pre-adjust the pH value of the concentrated liquid inside the concentration chamber. The pH value of the liquid inside the concentration chamber is detected by using the pH sensor inside the concentration chamber, and the injection of acid and alkali agents is selected according to actual conditions to facilitate subsequent processing.

[0035] A method for desalting casein acid whey comprises the following steps: S1. Acid whey pretreatment: In the casein workshop, the acid whey is pumped into the whey temporary storage tank after passing through the plate frame to sterilize the raw materials. The sterilized materials are premixed to prevent the index difference from being too large. The premixed materials can be directly pumped into the nanofiltration system for treatment; S2. After the raw material pretreatment, the microbial index and turbidity index of the material meet the conditions for entering the nanofiltration system, and then it can enter the nanofiltration system. After being filtered by the nanofiltration system, the concentrated liquid is further processed in the electrodialysis system after being heated; S3. After electrodialysis desalination, the material that meets the conductivity is sent to the electrodialysis temporary storage tank to wait for the ion exchange system to feed the material. The outlet is equipped with a cooling plate heat exchanger. After cooling to 15 degrees Celsius, it is sent to the ion exchange system to prevent the growth of microorganisms. After electrodialysis and ion exchange, it is introduced into the pH adjustment system for pH adjustment; S4, the desalted whey liquid is transported to the milk warehouse system of the milk powder workshop, and enters through the milk collection system pipeline. All are completed using the original system. The pasteurizer is sterilized at 85℃. After sterilization, it is transported to other milk warehouses to wait for the protein coefficient to be adjusted, and the evenly mixed materials are sent to the evaporator for concentration; S5. The evaporator cools the concentrated whey liquid and pumps it into the crystallization tank system with pressure, waiting for crystallization. During the crystallization process, stirring is started and the crystallization time is 3 hours. The change in material concentration is observed to confirm the crystallization situation. The crystallization discharge is equipped with a sanitary rotor pump, an online tubular heater, and a shear emulsifying pump, and sent to the original concentrated milk system for spray drying.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A casein acid whey desalination device, comprising a pretreatment system, a nanofiltration system, an electrodialysis and ion exchange system, a pH value adjustment system, a milk silo system and a concentrated material crystallization system, characterized in that: The nanofiltration system comprises a raw liquid tank (1) and a filtrate tank (4), two filter tanks (2) are arranged between the raw liquid tank (1) and the filtrate tank (4), a connecting shell (3) is arranged between the filter tank (2) and the filtrate tank (4), a nanofiltration membrane is arranged inside the connecting shell (3), a filtration mechanism (5) is arranged inside the filter tank (2), and a backwash module is arranged at the bottom of the filtrate tank (4); The bottom of the raw liquid tank (1) is connected to a first pump body (101); the liquid outlet end of the first pump body (101) is connected to a first electric three-way valve (102); one end of the first electric three-way valve (102) is connected to a discharge pipe (103); the other end of the first electric three-way valve (102) is connected to a second electric three-way valve (104); both ends of the second electric three-way valve (104) are connected to an inlet pipe (105) connected to the filter tank (2); One side of the filter tank (2) is connected to a dewatering pipe (203) connected to a filtrate tank (4); the bottom of the filter tank (2) is connected to a second pump body (201); a liquid outlet end of the second pump body (201) is connected to a water inlet end of a nanofiltration membrane; a concentrated liquid outlet end of the nanofiltration membrane is connected to a reflux pipe (301) connected to a raw liquid tank (1); and a filtrate outlet end of the nanofiltration membrane is connected to an inlet pipe connected to a filtrate tank (4).

2. A casein acid whey desalination device according to claim 1, characterized in that, The filtering mechanism (5) comprises a mounting plate (501) fixedly connected to the inside of the filtering tank (2), the surface of the mounting plate (501) being provided with evenly distributed filter holes (502), and the mounting plate (501) divides the inside of the filtering tank (2) into a concentration chamber and a filtrate chamber; The liquid inlet end of the second pump body (201) is connected to the concentration chamber, and the outlet pipe (203) is connected to the filtrate chamber.

3. A casein acid whey desalting device according to claim 2, characterized in that, Two symmetrically distributed regulating capsules (505) are embedded and installed on the inner wall of the filter hole (502); a fixing rod (503) is coaxially arranged inside the filter hole (502); the surface of the fixing rod (503) is provided with evenly distributed fixing tubes (511); the surface of the fixing tube (511) is slidably connected with an regulating sleeve (504); the other end of the regulating sleeve (504) is fixedly connected to the surface of an adjacent regulating capsule (505); and a filter membrane (506) is embedded and installed at one end of the regulating capsule (505) close to the introduction tube (105).

4. A casein acid whey desalination device according to claim 3, characterized in that, A sliding cavity is provided inside the fixing rod (503), a sliding rod (507) is slidably connected to the inner wall of the sliding cavity, connecting holes (509) are provided at both ends of the fixing rod (503), and the fixing tube (511) is in communication with the sliding cavity.

5. A casein acid whey desalination device according to claim 4, characterized in that, An introduction hole (513) is provided at one end of the sliding rod (507) away from the introduction tube (105); the surface of the sliding rod (507) is provided with evenly distributed through holes (508) corresponding to the fixed tube (511); the surface of the sliding rod (507) is provided with grooves (510) staggered with the through holes (508); the surface of the sliding rod (507) is provided with evenly distributed discharge channels (512); and the three grooves (510) are connected via the discharge channels (512).

6. A casein acid whey desalination device according to claim 5, characterized in that: Two rotating shafts (514) are rotatably connected to the inner wall of the concentration chamber, and evenly distributed blades (515) are fixedly connected to the surface of the rotating shafts (514). One end of each of the two rotating shafts (514) passes through the filter tank (2) and is provided with a transmission mechanism (516).

7. A casein acid whey desalination device according to claim 2, characterized in that: The backwash module comprises a third pump body (403) arranged at the bottom of the filtrate tank (4), the liquid inlet end of the third pump body (403) is connected to the filtrate tank (4), the liquid outlet end of the third pump body (403) is connected to an injection pipe (402), the other end of the injection pipe (402) is connected to a third electric three-way valve, both ends of the third electric three-way valve are connected to a backwash pipe, and the backwash pipe is connected to the filtrate chamber.

8. A casein acid whey desalination device according to claim 1, characterized in that: A liquid discharge pipe (401) in communication with the concentration chamber is provided on the surface of the filter tank (2), and a solenoid valve is provided on the surface of the liquid discharge pipe (401).

9. A casein acid whey desalination device according to claim 2, characterized in that: A pH value sensor is arranged inside the concentration chamber, and pressure sensors are arranged inside the concentration chamber and the filtrate chamber. Two adjustment components (202) are arranged on the top of the filter tank (2).

10. A method for desalting casein acid whey, for using a casein acid whey desalting device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Acid whey pretreatment: In the casein workshop, the acid whey is pumped into the whey temporary storage tank after passing through the plate frame to sterilize the raw materials. The sterilized materials are premixed to prevent the index difference from being too large. The premixed materials can be directly pumped into the nanofiltration system for treatment; S2. After the raw material pretreatment, the microbial index and turbidity index of the material meet the conditions for entering the nanofiltration system, and then it can enter the nanofiltration system. After being filtered by the nanofiltration system, the concentrated liquid is further processed in the electrodialysis system after being heated; S3. After electrodialysis desalination, the material that meets the conductivity is sent to the electrodialysis temporary storage tank to wait for the ion exchange system to feed the material. The outlet is equipped with a cooling plate heat exchanger. After cooling to 15 degrees Celsius, it is sent to the ion exchange system to prevent the growth of microorganisms. After electrodialysis and ion exchange, it is introduced into the pH adjustment system for pH adjustment; S4, the desalted whey liquid is transported to the milk warehouse system of the milk powder workshop, and enters through the milk collection system pipeline. All are completed using the original system. The pasteurizer is sterilized at 85℃. After sterilization, it is transported to other milk warehouses to wait for the protein coefficient to be adjusted, and the evenly mixed materials are sent to the evaporator for concentration; S5. The evaporator cools the concentrated whey liquid and pumps it into the crystallization tank system with pressure, waiting for crystallization. During the crystallization process, stirring is started and the crystallization time is 3 hours. The change in material concentration is observed to confirm the crystallization situation. The crystallization discharge is equipped with a sanitary rotor pump, an online tubular heater, and a shear emulsifying pump, and sent to the original concentrated milk system for spray drying.

Images