Method for sterilizing fresh milk concentrate

Abstract

The application relates to the field of dairy product production and processing, and particularly discloses a fresh milk concentration sterilization process method which comprises the following steps: raw material treatment, water filtration, flash sterilization, concentration adjustment, aseptic filling and the like. The method can realize instant contact of concentrated fresh milk with steam, simultaneous atomization of the fresh milk, and steam emission of part of water, so that the effect of instant sterilization is achieved. The atomized fresh milk can be instantaneously condensed, and the condensed water of the steam is mixed with the condensed fresh milk to form aseptic concentrated fresh milk. The water condensed by the steam can be adjusted through concentration adjustment, so that the concentration of the concentrated fresh milk after high-temperature sterilization is still within the required range.

Description

Technical Field

[0001] This invention belongs to the field of dairy product production and processing, and specifically relates to a method for concentrating and sterilizing fresh milk. Background Technology

[0002] Concentrated milk is fresh milk with a high protein content obtained by removing water from pure milk, and it is highly favored by the market. Existing fresh milk concentration processes typically include steps such as concentration, sterilization, and bottling, among which the sterilization process plays a crucial role in determining the shelf life and quality of fresh milk.

[0003] Traditional sterilization processes typically employ low-temperature pasteurization and UHT technology. Traditional pasteurized milk is not completely sterilized due to the low temperature, resulting in a shorter shelf life; while high-temperature sterilization technologies such as UHT have a high sterilization rate, but the heating time is difficult to control, which can easily lead to the formation of furosine and affect the quality of dairy products.

[0004] Patent application number "2019111960445" discloses a high-protein, high-fat concentrated milk and its preparation method. The main steps include: milk pretreatment, centrifugation, microfiltration, mixing, and standardization; after standardization, direct steam sterilization is performed at a temperature of 140-143℃ for 3-6 seconds. This direct steam sterilization can be either steam immersion sterilization or steam jet sterilization, and the raw milk is raw cow's milk. As can be seen from this prior art, although direct steam sterilization replaces pasteurization and UHT sterilization in the concentrated milk preparation process, the sterilization time is still more than 3 seconds. Excessive sterilization time affects the taste of the milk, but shortening the sterilization time would affect the sterilization effect. Furthermore, direct steam sterilization allows moisture from the steam to seep into the concentrated milk raw material, thus affecting the water content and product quality of the concentrated milk.

[0005] The above background information is provided only to aid in understanding the inventive concept and technical solution of this invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0006] The purpose of this invention is to provide a method for concentrating and sterilizing fresh milk, thereby overcoming the shortcomings of existing direct steam sterilization methods, such as long sterilization time and impact on the water content of concentrated milk.

[0007] To achieve the above objectives, the present invention provides a method for concentrating and sterilizing fresh milk, comprising the following steps:

[0008] S1. Raw material processing: Samples are taken to test the types and total number of bacteria in fresh milk. Once the indicators meet the requirements, the fresh milk is degassed.

[0009] S2. Moisture filtration: Concentrate fresh milk by using ultrafiltration membrane moisture filtration;

[0010] S3, Flash sterilization: The concentrated fresh milk is filled into the flash cooling device. Steam and circulating water are introduced into the flash cooling device. The concentrated fresh milk can be atomized by steam for instant sterilization and some water is flashed out. Then the atomized fresh milk is instantly condensed into a liquid state and mixed with some water brought by steam liquefaction.

[0011] S4. Concentration Adjustment: The concentration of the fresh milk after flash evaporation is measured, and the result is fed back to the inlet and outlet valves connected to the flash evaporation and cooling device. This changes the flow rate of the circulating water and the water level in the flash evaporation and cooling device to adjust the moisture from the condensation of steam and ensure that the concentration of the fresh milk meets the requirements.

[0012] S5. Aseptic filling: The packaging is first sterilized with steam, and then the concentrated fresh milk is aseptically filled through an automated filling line.

[0013] Preferably, in the above technical solution, in steps S3 and S4, the flash cooling device includes a pressure tank and a main tank. The pressure tank is fixedly installed on the top of the main tank, and the top of the pressure tank is provided with a feed inlet. The interior of the main tank is provided with a steam chamber, a cooling chamber, and a discharge chamber from top to bottom. The side of the main tank is provided with a water inlet pipe and a water outlet pipe connected to the cooling chamber. The water inlet pipe is connected to the water inlet valve, and the water outlet pipe is connected to the water outlet valve. Several cooling pipes are provided in the cooling chamber, and the two ends of the cooling pipes connect the steam chamber and the discharge chamber. The components are interconnected. A discharge pipe connected to the discharge chamber is provided at the bottom of the main tank. A concentration sensor is provided in the discharge chamber. A steam chamber that can move up and down is provided in the steam chamber. Several jet hoods are provided at the bottom of the steam chamber. The jet hoods have nozzles facing the cooling chamber. An air inlet pipe and a liquid guide pipe are provided at the top of the main tank. The air inlet pipe is connected to the steam chamber. One end of the liquid guide pipe is connected to the bottom of the pressurization tank. The other end of the liquid guide pipe passes through the top of the steam chamber and extends to the nozzle. The other end of the liquid guide pipe has a liquid guide hole.

[0014] Preferably, in the above technical solution, one end of the jet shroud is detachably connected to the bottom of the steam chamber, the other end of the jet shroud extends downward and narrows and then expands, and the nozzle is located at the other end of the jet shroud.

[0015] Preferably, in the above technical solution, the diameter of the other end of the liquid guide tube gradually narrows to form a cone, and the liquid guide hole is opened on the side of the cone. When the steam chamber moves up and down, the size of the gap between the side of the cone and the inner wall of the jet shroud can be changed.

[0016] Preferably, in the above technical solution, the number of intake pipes is two or more.

[0017] Preferably, in the above technical solution, the air intake pipe is connected to the steam chamber via a first flexible bend.

[0018] Preferably, in the above technical solution, a cooling plate is provided between the cooling chamber and the steam chamber, a plurality of water permeable holes are provided on the cooling plate, a condensation surface is provided between each of the water permeable holes, one end of the cooling pipe is connected to the water permeable hole, and a chamfered surface is provided around the water permeable hole.

[0019] Preferably, in the above technical solution, the side of the main tank is also provided with a pressure relief pipe, which is connected to the steam chamber.

[0020] Preferably, in the above technical solution, a guide rail is provided on the inner wall of the steam chamber, and a guide groove is provided on the periphery of the steam chamber. The guide groove can be locked on the guide rail and slide along the guide rail. A fixed seat is provided on the top of the steam chamber, and a detachable threaded sleeve is provided in the fixed seat. A rotatable shaft is provided on the top of the main body tank. One end of the shaft extends into the steam chamber and is threadedly connected to the threaded sleeve. The other end of the shaft extends outward from the top of the main body tank and is provided with a rotating head. Several force-adding grooves are opened on the top of the rotating head, and the force-adding grooves penetrate the side of the rotating head.

[0021] Preferably, in the above technical solution, one end of the liquid guide tube is connected to the bottom of the pressurization tank through a second flexible bend.

[0022] Compared with existing technologies, the present invention has the following advantages:

[0023] 1. The flash sterilization step in the fresh milk concentration sterilization method of the present invention can instantly contact the concentrated fresh milk with steam and simultaneously atomize and evaporate some water, achieving the effect of instant sterilization. The atomized fresh milk can be instantly condensed and remixed with the condensate of steam to form sterile concentrated fresh milk. The water content of the steam condensation can be adjusted by concentration adjustment, thereby ensuring that the concentration of the concentrated fresh milk is still within the required range after high-temperature sterilization.

[0024] 2. The flash cooling device of this invention is equipped with a pressurized tank, which can lift the fresh milk to be sterilized, thereby increasing its potential energy. Then, under the action of its own gravity, the fresh milk flows through the liquid guide pipe and out of the liquid guide hole. The liquid guide hole is located at the nozzle of the jet hood. The nozzle has a Laval structure. The steam in the steam chamber is accelerated through the nozzle, thereby materializing the fresh milk flowing out of the liquid guide hole and spraying it into the steam chamber. This achieves the instantaneous atomization of the fresh milk into small water droplets and instantaneous heating. At this time, the steam chamber is also filled with steam. The atomized fresh milk comes into full contact with the steam in the steam chamber and is rapidly reheated, making the heating time of the fresh milk shorter and the sterilization more thorough.

[0025] 3. The other end of the liquid guide tube in this invention is an inverted conical cone with a liquid guide hole on the side of the cone. The cone tip structure can guide the flow and form a double Laval mechanism, making the spray more uniform and increasing the spray speed.

[0026] 4. The height of the steam chamber in this invention is adjustable, thereby allowing adjustment of the gap between the nozzle and the cone, as well as the spray range and spray speed, thus adapting to the atomization of fresh milk of different viscosities.

[0027] 5. The number of air inlet pipes in this invention is two or more, so that they can be adjusted according to the steam volume requirements. That is, when a small air volume is required, one air inlet pipe can be used, and when a large air volume is required, multiple air inlet pipes can be used.

[0028] 6. The cooling chamber of this invention is equipped with a cooling plate, and the cooling plate has a condensation surface, which can condense the steam in the atomization chamber to replenish the water evaporated from the fresh milk. By circulating cooling water into the cooling chamber, convection can be formed with the cooling pipe to quickly cool the fresh milk flowing through the cooling pipe. By adjusting the flow rate of the inlet and outlet valves, the water level of the cooling water can be controlled, thereby changing the distance between the cooling water and the cooling plate, thus changing the temperature of the cooling plate, thereby adjusting the amount of steam cooling water to achieve the purpose of secondary adjustment of the fresh milk concentration. Attached Figure Description

[0029] Figure 1 This is a flowchart of the dairy product concentration and sterilization method in Example 1.

[0030] Figure 2 This is a structural diagram of the flash cooling device in Example 2.

[0031] Figure 3 This is a partial cross-sectional view of the main tank in Example 2.

[0032] Figure 4 This is a partial cross-sectional view of the steam chamber and the top of the main tank in Example 2.

[0033] Figure 5 This is a structural diagram of the liquid guide tube in Example 2.

[0034] Figure 6 This is a structural diagram of the cooling plate in Example 2.

[0035] Explanation of key figure labels:

[0036] 100 - Pressure tank; 101 - Feed inlet;

[0037] 200-Main tank, 201-Steam chamber, 202-Cooling chamber, 203-Discharge chamber, 204-Water inlet pipe, 205-Water outlet pipe, 206-Cooling pipe, 207-Discharge pipe, 208-Air inlet pipe, 209-Liquid guide pipe, 210-Liquid guide hole, 211-Conical head, 212-First flexible bend, 213-Cooling plate, 214-Water permeable hole, 215-Condensation surface, 216-Inverted slope, 217-Pressure relief pipe, 218-Guide rail, 219-Second flexible bend;

[0038] 300-Steam chamber, 301-Guide channel, 302-Fixed seat, 304-Rotating shaft, 305-Rotating head, 306-Afterburner channel; 400-Jet shroud, 410-Nozzle. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "top surface," "bottom surface," "inner," "outer," "inner side," and "outer side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. Where the terms "first," "second," and "third" are used for descriptive purposes and to distinguish technical features, they should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The embodiments of this invention will now be described according to its overall structure.

[0043] Example 1

[0044] like Figure 1 As shown, the fresh milk concentration and sterilization method in this embodiment includes the following steps:

[0045] S1. Raw material processing: Samples are taken from fresh milk to test the types and total number of bacteria. Once the indicators meet the requirements, the fresh milk is degassed.

[0046] S2. Moisture filtration: Fresh milk is concentrated by water filtration using ultrafiltration membranes; different membranes can be used to separate raw materials of different particle sizes, among which RO membrane filtration technology can achieve a pore size of 10-3 μm and a molecular weight cutoff of 100 Da.

[0047] S3. Flash sterilization: Concentrated fresh milk is filled into a flash cooling device. Steam and circulating water are introduced into the flash cooling device. The concentrated fresh milk can be atomized by steam for instant sterilization and some water is flashed out. Then, the atomized fresh milk is instantly condensed into a liquid state and mixed with some water from the steam liquefaction. The steam pressure and volume are controlled to ensure that the high temperature time is about 0.09 seconds, and the temperature of the circulating water is controlled at 0-5 degrees Celsius.

[0048] S4. Concentration Adjustment: The concentration of the fresh milk after flash evaporation is measured, and the result is fed back to the inlet and outlet valves connected to the flash evaporation cooling device. By controlling the opening of the inlet and outlet valves, the difference between the inlet and outlet flow rates is controlled, thereby changing the flow rate of the circulating water and the water level in the flash evaporation cooling device to adjust the moisture from the condensation of steam and ensure that the concentration of the fresh milk meets the requirements.

[0049] S5. Aseptic filling: The packaging is first sterilized with steam, and then the concentrated fresh milk is aseptically filled through an automated filling line.

[0050] Example 2

[0051] like Figure 2 Figure 6 As shown, the flash cooling device in this embodiment includes: a pressurized tank 100, a feed inlet 101, a main tank 200, a steam chamber 201, a cooling chamber 202, a discharge chamber 203, a water inlet pipe 204, a water outlet pipe 205, a cooling pipe 206, a discharge pipe 207, an air inlet pipe 208, a liquid guide pipe 209, a liquid guide hole 210, a cone head 211, a first flexible bend pipe 212, a cooling plate 213, a water permeable hole 214, a condensation surface 215, an inclined surface 216, a pressure relief pipe 217, a guide rail 218, a second flexible bend pipe 219, a steam chamber 300, a guide groove 301, a fixed base 302, a rotating shaft 304, a rotating head 305, a booster groove 306, a jet hood 400, and a nozzle 410.

[0052] Both the main tank 200 and the pressure tank 100 are made of stainless steel. The pressure tank 100 is fixedly installed on top of the main tank 200, and a feed inlet 101 is provided on the top of the pressure tank 100. The interior of the main tank 200, from top to bottom, has a steam chamber 201, a cooling chamber 202, and a discharge chamber 203. A water inlet pipe 204 and a water outlet pipe 205 are connected to the side of the main tank 200 and communicate with the cooling chamber 202 near its lower part. A water inlet valve is connected to the water inlet pipe 204, and a water outlet valve is installed on the water outlet pipe 205. Multiple... Cooling pipe 206 is fixedly installed inside cooling chamber 202. The pipe body of cooling pipe 206 is installed vertically, and both ends of cooling pipe 206 connect steam chamber 201 and unloading chamber 203. Discharge pipe 207 is installed at the bottom of main tank 200 and connected to unloading chamber 203. A concentration sensor is installed inside unloading chamber 203. Steam chamber 300 is installed inside steam chamber 201 and can move up and down along steam chamber 300. The interior of steam chamber 300 is a hollow structure. Multiple jet hoods 400 are detachably installed in steam chamber 300. At the bottom, the jet shroud 400 has a cone-shaped structure. A nozzle 410 facing the cooling chamber 202 is located below the jet shroud 400. An air inlet pipe 208 and a liquid guide pipe 209 are fixedly installed on the top of the main tank 200. The air inlet pipe 208 is connected to the top of the steam chamber 300 via a first flexible bend 212. One end of the liquid guide pipe 209 is connected to the bottom of the pressurized tank 100 via a second flexible bend 219. The other end of the liquid guide pipe 209 passes through the top of the steam chamber 300 and extends to the nozzle 410. A sealing device is provided on the top of the steam chamber 300. The other end of the liquid guide pipe 209 passes through the sealing seat and can move relative to the sealing seat. The diameter of the other end of the liquid guide pipe 209 gradually narrows to form a cone 211. The liquid guide hole 210 is opened on the side of the cone 211. When the steam chamber 300 moves up and down, it can change the size of the gap between the side of the cone 211 and the inner wall of the jet hood 400, thereby changing the size of the spray volume and the spray speed. The pressure relief pipe 217 is installed on the side of the main tank 200 and is connected to the steam chamber 201. A pressure relief valve is provided on the pressure relief pipe 217.

[0053] More specifically, several screw holes are provided at the bottom of the steam chamber 300, and an external thread is provided at one end of the jet shroud 400 so that one end of the jet shroud 400 can be threadedly connected to the bottom of the steam chamber 300. The other end of the jet shroud 400 extends downward and first narrows and then expands, and the nozzle 410 is provided at the other end of the jet shroud 400.

[0054] In addition, there are two or more air intake pipes 208. By adjusting the number of air intake pipes 208, the air intake of the steam chamber 300 can be adjusted, thereby adjusting the jet volume and jet speed at the nozzle 410.

[0055] A cooling plate 213 is installed between the cooling chamber 202 and the steam chamber 201. Multiple water permeable holes 214 are provided on the cooling plate 213. A condensing surface 215 is provided between each water permeable hole 214. One end of the cooling pipe 206 is connected to the water permeable hole 214. A beveled surface 216 is provided around the water permeable hole 214.

[0056] More specifically, multiple guide rails 218 are fixedly installed on the inner wall of the steam chamber 201, and the guide rails 218 are arranged vertically. A guide groove 301 is provided on the periphery of the steam chamber 300, and the guide groove 301 can be engaged with the guide rails 218 and slide along the guide rails 218. A fixing seat 302 is installed on the top of the steam chamber 300, and a detachable threaded sleeve is installed in the fixing seat 302. A rotatable rotating shaft 304 is installed on the top of the main tank 200, and one end of the rotating shaft 304 extends into... The shaft 304 extends outward from the top of the main body tank 200 and is connected to the steam chamber 201 by a threaded connection with the sleeve. The other end of the shaft 304 extends outward from the top of the main body tank 200 and is equipped with a rotating head 305. Multiple force grooves 306 are provided on the top of the rotating head 305. The force grooves 306 pass through the side of the rotating head 305. The rotating head 305 can be rotated by passing the force rod through the force grooves 306. Since the second flexible tube has a certain degree of curvature, it can have more rotation space when rotating the force rod.

[0057] Next, the working principle of a flash cooling device in this embodiment will be described in detail to enable those skilled in the art to better understand the present invention:

[0058] During equipment operation, fresh milk is added to the pressurization tank 100 through the inlet 101, and then flows into the liquid guide pipe 209 through the second flexible bend 219. The air inlet pipe 208 is connected to the steam generator, introducing steam into the steam chamber 300. When the steam passes through the nozzle 410 of the jet hood 400, the nozzle 410, being a Laval structure, accelerates the gas. The accelerated steam carries the fresh milk flowing out of the guide hole and rapidly atomizes it. Due to the temperature of the steam itself and the accumulation of steam in the steam chamber 201, the atomized milk droplets are rapidly heated and flash-evaporated. After heating, the atomized milk droplets are splashed onto the cooling plate 213. During this process, some water in the milk is lost due to flash evaporation. Low-temperature circulating water is introduced into the cooling chamber 202 through the water inlet pipe 204 and the water outlet pipe 205. The water level in the cooling chamber 202 can be controlled by adjusting the flow rates of the water inlet and outlet valves. The temperature of the condensing surface 215 of the cooling plate 213 can be changed by adjusting the temperature of the steam. Some steam comes into contact with the condensing surface 215 to form condensate. The condensate combines with the atomized milk sprayed on the cooling plate 213 to form concentrated milk of a new concentration. This concentrated milk is then immersed into the cooling pipe 206 through the inclined surface 216. Due to the continuous flow of cooling water around the cooling pipe 206, heat dissipation is achieved quickly. When the cooled concentrated milk flows into the discharge chamber 203, the concentration of the concentrated milk is detected by a concentration sensor. If the concentration is too high, the flow rate of the inlet and outlet valves needs to be adjusted to raise the level of the cooling water in the cooling chamber 202, thereby lowering the temperature of the cooling plate 213 and increasing the amount of condensation of the cooling water, thus lowering the concentration of the concentrated milk. If the concentration is too low, the flow rate of the inlet and outlet valves is adjusted to appropriately lower the level of the cooling water in the cooling chamber 202, thereby raising the temperature of the cooling plate 213 and reducing the amount of condensation of the cooling water, thus increasing the concentration of the concentrated milk. By combining the controller with electromagnetic control valves for the inlet and outlet valves, the device can automatically monitor and adjust the concentration of the finished concentrated fresh milk in real time.

[0059] In summary, the fresh milk concentration and sterilization method of this invention can instantly contact the concentrated fresh milk with steam, atomize it, and evaporate some of the water, thus achieving instant sterilization. The atomized fresh milk can then be instantly condensed and remixed with the condensate from the steam to form sterile concentrated fresh milk. The concentration adjustment can regulate the water content of the steam condensation, thereby ensuring that the concentration of the concentrated fresh milk remains within the required range after high-temperature sterilization.

[0060] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the invention and are protected by patent law.

Claims

1. A method for concentrating and sterilizing fresh milk, characterized in that, Includes the following steps: S1. Raw material processing: Samples are taken to test the types and total number of bacteria in fresh milk. Once the indicators meet the requirements, the fresh milk is degassed. S2. Moisture filtration: Concentrate fresh milk by using ultrafiltration membrane moisture filtration; S3, Flash sterilization: The concentrated fresh milk is filled into the flash cooling device. Steam and circulating water are introduced into the flash cooling device. The concentrated fresh milk can be atomized by steam for instant sterilization and some water is flashed out. Then the atomized fresh milk is instantly condensed into a liquid state and mixed with some water brought by steam liquefaction. S4. Concentration Adjustment: The concentration of the fresh milk after flash evaporation is measured, and the result is fed back to the inlet and outlet valves connected to the flash evaporation and cooling device. This changes the flow rate of the circulating water and the water level in the flash evaporation and cooling device to adjust the moisture from the condensation of steam and ensure that the concentration of the fresh milk meets the requirements. S5. Aseptic filling: The packaging is first sterilized with steam, and then the concentrated fresh milk is aseptically filled through an automated filling line. In steps S3 and S4, the flash cooling device includes a pressurized tank and a main tank. The pressurized tank is fixedly installed on the top of the main tank, and the top of the pressurized tank has a feed inlet. The interior of the main tank, from top to bottom, has a steam chamber, a cooling chamber, and a discharge chamber. The side of the main tank has an inlet pipe and an outlet pipe connected to the cooling chamber. The inlet pipe is connected to an inlet valve, and the outlet pipe is connected to an outlet valve. Several cooling pipes are installed in the cooling chamber, and the two ends of the cooling pipes connect the steam chamber and the discharge chamber. An outlet pipe connected to the discharge chamber is located at the bottom of the main tank. A concentration sensor is installed in the discharge chamber. The steam chamber contains a vertically movable steam chamber. The bottom of the steam chamber has several jet nozzles facing the cooling chamber. An air inlet pipe and a liquid guide pipe are located at the top of the main tank. The air inlet pipe connects to the steam chamber, and one end of the liquid guide pipe connects to the bottom of the pressurized tank. The other end of the liquid guide pipe passes through the top of the steam chamber and extends to the jet nozzles. A liquid guide hole is located at the other end of the liquid guide pipe. A cooling plate is located between the cooling chamber and the steam chamber. Several water-permeable holes are formed on the cooling plate, and a condensation surface is provided between each water-permeable hole. One end of the cooling pipe connects to each water-permeable hole, and a beveled surface is provided around each water-permeable hole.

2. The method for concentrating and sterilizing fresh milk according to claim 1, characterized in that, One end of the jet shroud is detachably connected to the bottom of the steam chamber, and the other end of the jet shroud extends downward and narrows and then expands, with the nozzle located at the other end of the jet shroud.

3. The method for concentrating and sterilizing fresh milk according to claim 2, characterized in that, The diameter of the other end of the liquid guide tube gradually narrows to form a cone. The liquid guide hole is opened on the side of the cone. When the steam chamber moves up and down, it can change the size of the gap between the side of the cone and the inner wall of the jet shroud.

4. The method for concentrating and sterilizing fresh milk according to claim 1, characterized in that, The number of intake pipes is two or more.

5. The method for concentrating and sterilizing fresh milk according to claim 1, characterized in that, The air intake pipe is connected to the steam chamber via a first flexible bend.

6. The method for concentrating and sterilizing fresh milk according to claim 1, characterized in that, The main tank is also provided with a pressure relief pipe on its side, which is connected to the steam chamber.

7. The method for concentrating and sterilizing fresh milk according to claim 1, characterized in that, A guide rail is provided on the inner wall of the steam chamber, and a guide groove is provided on the periphery of the steam chamber. The guide groove can be locked onto the guide rail and slide along the guide rail. A fixed seat is provided on the top of the steam chamber, and a detachable threaded sleeve is provided in the fixed seat. A rotatable shaft is provided on the top of the main tank. One end of the shaft extends into the steam chamber and is threadedly connected to the threaded sleeve. The other end of the shaft extends outward from the top of the main tank and is provided with a rotating head. Several force-adding grooves are opened on the top of the rotating head, and the force-adding grooves penetrate the side of the rotating head.

8. The method for concentrating and sterilizing fresh milk according to claim 7, characterized in that, One end of the liquid guide tube is connected to the bottom of the pressurization tank via a second flexible bend.

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