UHT system

Abstract

A UHT system includes a material side and a hot water side. Among them, the material side includes a material inlet, an inlet and outlet control valve group, and a material balance tank; the hot water side includes a degassing and homogenization section heat exchanger, a degassing and homogenization unit, a sterilization section heat exchanger, a high-temperature holding pipe, a heat recovery section heat exchanger, a hot water tank, an outlet cooling heat exchange unit, and a product outlet; the material side includes a check valve and a first reversing valve, which are arranged between the product return port and the inlet and outlet control valve group; the hot water side includes a second reversing valve and a stop valve, which are arranged between the inlet and outlet control valve group and the hot water tank. The UHT system provided by the present invention, through the check valve and the first reversing valve arranged between the product return port and the inlet and outlet control valve group and the second reversing valve and the stop valve arranged between the inlet and outlet control valve group and the hot water tank, directly introduces the cleaning liquid on the material side into the hot water side when the material side is being cleaned, realizing simultaneous cleaning of the material side and the hot water side.

Description

Technical Field

[0001] The present invention relates to the field of UHT systems, and further relates to a UHT system for simultaneous cleaning of the material side and the hot water side. Background Art

[0002] In industries such as food and beverage, chemical industry, and medicine, for occasions where pipelines, valves, heat exchangers, etc. used in UHT systems (Ultra High Temperature treated) are cleaned by CIP (Clean in place), in addition to cleaning the tube side of the material pipeline heat exchanger, the hot water pipeline of the system heat exchange medium and the shell side of the heat exchanger will scale on the heat exchange medium side after long-term operation. Through various chemicals and special temperature conditions, various cleaning steps are carried out on the shell side of the hot water side pipeline heat exchanger, and at the same time, the CIP cleaning liquid reaches the cleaning purpose through circulating flow.

[0003] The standard cleaning process of the UHT system is to use CIP liquid to replace the equipment production material, and the cleaning medium mainly cleans the pipelines, valves, and heat exchangers forward through the product delivery pipeline.

[0004] However, the existing UHT hot water system cannot be cleaned separately or simultaneously with the material pipeline. It can only be manually and temporarily modified the pipeline, adding chemicals to the hot system for manual cleaning. There are also some equipment using floating tube heat exchangers, which can only extract the inner tube bundle of the heat exchanger from the equipment for manual cleaning. These cleaning works are very troublesome and time-consuming. Summary of the Invention

[0005] In view of the above problems, the purpose of the present invention is to provide a UHT system.

[0006] According to the first aspect of the present invention, a UHT system is provided, including a material side and a hot water side. The material side includes a material inlet, a feeding and discharging control valve group, and a material balance tank connected in sequence; the hot water side includes a degassing and homogenizing section heat exchanger, a degassing and homogenizing unit, a sterilization section heat exchanger, a high-temperature holding tube, a heat recovery section heat exchanger, a hot water tank, an outlet cooling heat exchange unit, and a product outlet connected in sequence; the material side further includes a product return port connected to the feeding and discharging control valve group; the product outlet is connected to the product return port via a filling machine unit; the material side further includes a check valve and a first reversing valve disposed between the product return port and the feeding and discharging control valve group; the hot water side further includes a second reversing valve and a stop valve disposed between the feeding and discharging control valve group and the hot water tank.

[0007] Preferably, the material inlet is a cleaning liquid inlet; the product outlet is a cleaning liquid outlet, and the product return port is a cleaning liquid return port.

[0008] Preferably, the material balance tank and the degassing and homogenization section heat exchanger are connected by a material pipeline; a material output pump and a flow meter are provided on the material pipeline;

[0009] The material output pump transports the material or cleaning liquid in the material balance tank to the degassing and homogenization section heat exchanger;

[0010] The flow meter is used to detect the material flow rate or cleaning flow rate of the material output pump.

[0011] Preferably, the UHT system further includes: a steam heat exchanger, connected to the sterilization section heat exchanger, for providing high-temperature hot water to the sterilization section heat exchanger; wherein, the sterilization section heat exchanger receives the high-temperature hot water to exchange heat with the material or cleaning liquid.

[0012] Preferably, the steam heat exchanger is connected to the steam inlet through a steam pipeline, and a steam proportional valve is provided on the steam pipeline; the sterilization section heat exchanger is connected to the high-temperature holding pipe through a pipeline, and a temperature sensor is provided on this pipeline to detect the temperature of the material or cleaning liquid and feedback it to the steam proportional valve.

[0013] Preferably, the UHT system further includes: a conductivity detector, located between the product return port and the inlet and outlet control valve group, for detecting the concentration of the cleaning liquid and controlling the addition amount of chemicals.

[0014] Preferably, a hot water output pump is provided between the hot water tank and the heat recovery section heat exchanger to input the hot water in the hot water tank into the shell side of the heat recovery section heat exchanger.

[0015] Preferably, an external CIP station pumps the cleaning liquid into the material balance tank through the inlet and outlet control valve group, and the material balance tank outputs the cleaning liquid through the material pipeline to the tube side of the degassing and homogenization section heat exchanger, the degassing and homogenization unit for cleaning, and then returns to the tube side of the sterilization section heat exchanger to exchange heat with the cleaning liquid;

[0016] The hot water tank buffers and stores the water in the medium system, inputs the hot water into the shell side of the heat recovery section heat exchanger, and then flows into the shell side of the steam heat exchanger;

[0017] Steam is introduced into the tube side of the steam heat exchanger to heat the shell side medium water, and the heated high-temperature hot water is introduced into the sterilization section heat exchanger to exchange heat with the cleaning liquid; subsequently, the cleaning liquid flows into the high-temperature holding pipe, the tube side of the heat recovery section heat exchanger, and the outlet cooling heat exchange unit until the product outlet, and returns to the product return port through an external filling machine unit;

[0018] The cleaning liquid returns to the material balance tank through the first reversing valve and the inlet and outlet control valve group;

[0019] Wherein, the first reversing valve is in a closed state.

[0020] Preferably, an external CIP station pumps the cleaning liquid into the material balance tank through the inlet and outlet control valve group. The material balance tank outputs the cleaning liquid to the tube side of the degassing and homogenizing section heat exchanger and the degassing and homogenizing unit through a material pipeline for cleaning, and then returns to the tube side of the sterilization section heat exchanger to exchange heat with the cleaning liquid;

[0021] Then, the cleaning liquid enters the high-temperature holding pipe, the tube side of the heat recovery section heat exchanger, and the outlet cooling heat exchange unit until the product outlet, and returns to the product return port through the external filling machine unit;

[0022] The cleaning liquid is transported to the hot water tank through the first reversing valve and the second reversing valve;

[0023] The hot water tank buffers and stores the cleaning liquid in the medium system, inputs the cleaning liquid into the shell side of the heat recovery section heat exchanger, and then flows into the shell side of the steam heat exchanger;

[0024] Steam is introduced into the tube side of the steam heat exchanger to directly heat the cleaning liquid. The heated cleaning liquid enters the shell side of the sterilization section heat exchanger and the shell side of the degassing and homogenizing section heat exchanger for cleaning, and then returns to the first reversing valve through the second reversing valve, the stop valve, and the check valve, and continues to return to the material balance tank through the inlet and outlet control valve group;

[0025] Among them, the first reversing valve, the second reversing valve, and the stop valve are all in the open state.

[0026] Preferably, the first reversing valve and the second reversing valve are TL-type reversing valves; the stop valve is an L-type stop valve.

[0027] The UHT system provided by the present invention, through the check valve and the first reversing valve arranged between the product return port and the inlet and outlet control valve group, and the second reversing valve and the stop valve arranged between the inlet and outlet control valve group and the hot water tank, directly introduces the cleaning liquid on the material side to the hot water side when cleaning the material side during cleaning, realizing simultaneous cleaning of the material side and the hot water side. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Through the following description of the embodiments of the present invention with reference to the drawings, the above and other objects, features, and advantages of the present invention will become clearer. In the drawings:

[0029] Figure 1 A structural block diagram of the UHT system provided by the embodiment of the present invention is shown;

[0030] Figure 2 Shows Figure 1 The schematic diagram of the flow direction of the cleaning liquid when the material side and the hot water side of the UHT system in

[0031] Figure 3 ShowsFigure 1 Schematic diagram of the flow direction of the cleaning liquid during simultaneous cleaning of the material side and the hot water side of the UHT system

[0032] 1. Filling machine unit 2. Conductivity detector 3. Check valve 4. Shell-side cleaning TL-type reversing valve 1 5. Inlet and outlet control valve group 6. Material balance tank 7. Material output pump 8. Flowmeter 9. Degassing and homogenization section heat exchanger 10. Degassing and homogenization unit 11. Sterilization section heat exchanger 12. Material temperature detector 13. Steam proportioning valve 14. Holding tube for sterilization 15. Hot water temperature detector 16. Steam heat exchanger 17. Heat recovery section heat exchanger 18. Hot water output pump 19. Hot water tank 20. Shell-side cleaning TL-type reversing valve 2 21. Shell-side cleaning L-type stop valve 22. Outlet cooling heat exchange unit Detailed implementation manners

[0033] Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In each of the drawings, the same elements are denoted by the same or similar reference numerals. For the sake of clarity, the various parts in the drawings are not drawn to scale

[0034] The following will further describe in detail the specific implementation manners of the present invention in conjunction with the drawings and embodiments

[0035] Figure 1 The structural block diagram of the UHT system provided according to an embodiment of the present invention is shown. As Figure 1 shown, the UHT system includes a material side and a hot water side. Among them, the material side includes a material inlet, an inlet and outlet control valve group 5, and a material balance tank 6 connected in sequence; the hot water side includes a degassing and homogenization section heat exchanger 9, a degassing and homogenization unit 10, a sterilization section heat exchanger 11, a holding tube 14 for high temperature, a heat recovery section heat exchanger 17, a hot water tank 19, an outlet cooling heat exchange unit 22, and a product outlet connected in sequence; among them, the material side further includes a product return port, which is connected to the inlet and outlet control valve group 5; the product outlet is connected to the product return port via the filling machine unit 1; the material side further includes a check valve 3 and a first reversing valve 4, which are arranged between the product return port and the inlet and outlet control valve group 5; the hot water side further includes a second reversing valve 20 and a stop valve 21, which are arranged between the inlet and outlet control valve group 5 and the hot water tank 19

[0036] In this embodiment, the material inlet is the cleaning liquid inlet; the product outlet is the cleaning liquid outlet, and the product return port is the cleaning liquid return port

[0037] The material balance tank 6 and the degassing and homogenization section heat exchanger 9 are connected by a material pipeline; a material output pump 7 and a flowmeter 8 are arranged on the material pipeline; the material output pump 7 transports the material or cleaning liquid in the material balance tank 6 to the degassing and homogenization section heat exchanger 9; the flowmeter 8 is used to detect the material flow or cleaning flow of the material output pump

[0038] The UHT system further includes a steam heat exchanger 16, which is connected to the sterilization section heat exchanger 11 and is used to supply high-temperature hot water to the sterilization section heat exchanger 11. Wherein, the sterilization section heat exchanger 11 receives the high-temperature hot water to exchange heat with the material or cleaning liquid.

[0039] The steam heat exchanger 16 is connected to the steam inlet through a steam pipeline, and a steam proportional valve 13 is provided on the steam pipeline; the sterilization section heat exchanger 11 is connected to the high-temperature holding pipe 14 through a pipeline, and a temperature sensor 12 is provided on this pipeline to detect the temperature of the material or cleaning liquid and feed it back to the steam proportional valve 13.

[0040] The UHT system further includes a conductivity detector 2, which is located between the product return port and the inlet and outlet control valve group 5 and is used to detect the concentration of the cleaning liquid and control the chemical addition amount.

[0041] A hot water output pump 18 is provided between the hot water tank 19 and the heat recovery section heat exchanger 17 to input the hot water in the hot water tank into the shell side of the heat recovery section heat exchanger 17.

[0042] Specifically, an external CIP station pumps the cleaning liquid into the material balance tank 6 through the inlet and outlet control valve group 5. The material balance tank 6 outputs the cleaning liquid to the tube side of the degassing and homogenization section heat exchanger 9 and the degassing and homogenization unit 10 through a material pipeline for cleaning, and then returns to the tube side of the sterilization section heat exchanger 11 to exchange heat with the cleaning liquid; the hot water tank 19 buffers and stores the water in the medium system, inputs the hot water into the shell side of the heat recovery section heat exchanger 17, and then flows into the shell side of the steam heat exchanger 16; steam is introduced into the tube side of the steam heat exchanger 16 to heat the shell side medium water, and the heated high-temperature hot water is introduced into the sterilization section heat exchanger 11 to exchange heat with the cleaning liquid; subsequently, the cleaning liquid flows into the high-temperature holding pipe 14, the tube side of the heat recovery section heat exchanger 17, and the outlet cooling heat exchange unit 22 until the product outlet, and returns to the product return port through an external canning unit 1; the cleaning liquid returns to the material balance tank through the first reversing valve 4 and the inlet and outlet control valve group 5; wherein, the first reversing valve 4 is in a closed state, and at this time, the cleaning liquid enters the upper valve cavity through the middle valve cavity of the first reversing valve 4 and flows out.

[0043] Specifically, an external CIP station pumps the cleaning liquid into the material balance tank 6 through the inlet and outlet control valve group 5. The material balance tank 6 outputs the cleaning liquid through a material pipeline to the tube side of the degassing and homogenizing section heat exchanger 9 and the degassing and homogenizing unit 10 for cleaning, and then returns to the tube side of the sterilization section heat exchanger 11 to exchange heat for the cleaning liquid; then the cleaning liquid enters the high-temperature holding pipe 14, the tube side of the heat recovery section heat exchanger 17, and the outlet cooling heat exchange unit 22 until it reaches the product outlet, and returns to the product return port through the external filling machine unit 1; the cleaning liquid is transported to the hot water tank 19 through the first reversing valve 4 and the second reversing valve 20. At this time, the cleaning liquid enters the lower valve cavity process through the middle valve cavity of the first reversing valve 4, and then enters the middle valve cavity through the lower valve cavity of the second reversing valve 20 and flows into the hot water tank 19; the hot water tank 19 buffers and stores the cleaning liquid in the medium system, inputs the cleaning liquid into the shell side of the heat recovery section heat exchanger 17, and then flows into the shell side of the steam heat exchanger 16; steam is introduced into the tube side of the steam heat exchanger 16 to directly heat the cleaning liquid, and the heated cleaning liquid enters the shell side of the sterilization section heat exchanger 11 and the shell side of the degassing and homogenizing section heat exchanger 9 for cleaning, and then returns to the first reversing valve 4 through the second reversing valve 20, the stop valve 21, and the check valve 3, and continues to return to the material balance tank through the inlet and outlet control valve group 5; among them, the first reversing valve 4, the second reversing valve 20, and the stop valve 21 are all in the open state. At this time, the cleaning liquid enters from the left and exits from the right through the upper valve cavity of the second reversing valve 20, enters the upper valve cavity through the lower valve cavity of the stop valve 21 and exits, flows through the check valve 4 and returns to the upper valve cavity of the first reversing valve, entering from the left and exiting from the right, continues to flow back through the 5 inlet and outlet control valve group, and then returns to the 7 balance tank.

[0044] In this embodiment, the first reversing valve and the second reversing valve are TL-type reversing valves; the stop valve is an L-type stop valve.

[0045] This UHT system can perform separate cleaning processes for the material side and the hot water side, or can perform simultaneous cleaning processes for the material side and the hot water side.

[0046] Such as Figure 2As shown, when performing the separate cleaning processes for the material side and the hot water side, the cleaning liquid is added to the material balance tank 6 through the inlet and outlet control valve group 5. The cleaning liquid is output through the material output pump 7, and the flowmeter 8 detects and feeds back the cleaning flow rate of the material output pump 7. The cleaning liquid enters the tube side 9 of the degassing and homogenization section heat exchanger through the material pipeline, and then enters the degassing and homogenization unit 10 for cleaning. Then it flows back to the tube side 11 of the sterilization section heat exchanger to heat up the cleaning liquid. The hot water system and the cleaning liquid perform counter-flow heat exchange to increase the temperature. The hot water heat exchange system buffers and stores the water in the medium system through the hot water tank 19, and continuously outputs through the hot water output pump 18. First, it enters the shell side of the heat recovery section heat exchanger 17, and then flows out from another shell side port and into the shell side of the steam heat exchanger 16. Steam is introduced into the tube side of the steam heat exchanger 16 to heat the shell side medium water, and then the heated high-temperature hot water is used to perform heat exchange on the cleaning liquid in the sterilization section heat exchanger 11. The material temperature detector 12 continuously detects the temperature of the cleaning liquid and feeds it back to the steam proportional valve 13 on the steam pipeline to adjust the valve opening to control the temperature of the medium hot water, thereby indirectly controlling the temperature of the cleaning liquid. Subsequently, the cleaning liquid enters the sterilization holding tube 14 to clean its pipeline, and then enters the tube side of the heat recovery section heat exchanger 17 and the outlet cooling heat exchange unit 22 until it reaches the external filling machine unit 1 at the system outlet for cleaning, and then flows back to the UHT system. The conductivity detector 2 continuously monitors the control of the cleaning liquid, controls the chemical addition amount, and returns to the balance tank 7 through the shell side cleaning reversing valve 4 and the inlet and outlet control valve group 5 to achieve the separate cleaning processes for the material side and the hot water side in the continuous large cycle of the UHT system.

[0047] As Figure 3As shown, when performing the simultaneous cleaning process on the material side and the hot water side, the cleaning liquid is added to the material balance tank 6 through the inlet and outlet control valve group 5. The cleaning liquid is output through the material output pump 7, and the flowmeter 8 detects and feeds back the cleaning flow rate of the material output pump 7. The cleaning liquid enters the tube side 9 of the degassing and homogenization section heat exchanger through the material pipeline, and then enters the degassing and homogenization unit 10 for cleaning. Then it flows back to the tube side 11 of the sterilization section heat exchanger. Subsequently, the cleaning liquid flows into the high-temperature holding tube 14 to clean its pipeline. After coming out, it enters the tube side of the heat recovery section heat exchanger 17, and after coming out, it enters the outlet cooling heat exchange unit 22, and then reaches the 1 filling machine unit at the product outlet to the outside for cleaning, and then flows back to the UHT system. The conductivity detector 2 is used to detect the concentration of the cleaning liquid in real time and control the addition amount of chemicals. Then, through the first reversing valve 4 (in the open state), the cleaning liquid enters the lower valve cavity from the middle valve cavity of this valve and flows out, and continues to flow into the second reversing valve 20 (in the open state). The cleaning liquid enters the middle valve cavity from the lower valve cavity of this valve and flows out, and is transported to the 19 hot water tank to buffer and store the cleaning liquid in the medium system, and is continuously output through the hot water output pump 18. First, the shell side of the heat recovery section heat exchanger 17 is cleaned, and then it flows out from another shell side port and flows into the shell side of the steam heat exchanger 16 for cleaning. Steam is introduced into the tube side of the steam heat exchanger 16 to directly heat the cleaning liquid in the shell side. Through the temperature sensor 15, the temperature of the cleaning liquid is detected in real time and fed back to the 13 steam proportional valve on the steam pipeline to adjust the valve opening to directly control the temperature of the cleaning liquid. The heated cleaning liquid continues to flow out and enters the shell side of the sterilization section heat exchanger 11 for cleaning. After flowing out, it enters the shell side of the degassing and homogenization section heat exchanger 9 for cleaning. After flowing out, it flows into the upper valve cavity of the second reversing valve 20 (in the open state) from the left and out from the right, and then enters the upper valve cavity from the lower valve cavity through the stop valve 21 and flows out, and continues to flow through the one-way valve 3, and flows back to the upper valve cavity of the first reversing valve 4 (in the open state) from the left and out from the right, and continues to flow back through the inlet and outlet control valve group 5, and then flows back to the material balance tank 6. According to the above process, the UHT realizes continuous large-cycle cleaning, so that the material pipeline, hot water pipeline, tube side of the heat exchanger for materials, and shell side of the heat exchanger for hot water can be cleaned simultaneously and the cleaning concentration and cleaning temperature can be controlled.

[0048] The UHT system provided by the present invention, through the one-way valve and the first reversing valve arranged between the product return port and the inlet and outlet control valve group, and the second reversing valve and the stop valve arranged between the inlet and outlet control valve group and the hot water tank, directly introduces the cleaning liquid on the material side to the hot water side when cleaning the material side, realizing simultaneous cleaning of the material side and the hot water side.

[0049] As described above with reference to the embodiments of the present invention, these embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the above description. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and its modifications. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A UHT system, characterized in that: Including material side and hot water side, Among them, the material side includes the material inlet, the inlet and outlet control valve group, and the material balance tank connected in sequence; The hot water side includes a degassing and homogenizing section heat exchanger, a degassing and homogenizing unit, a sterilization section heat exchanger, a high temperature holding pipe, a heat recovery section heat exchanger, a hot water tank, an outlet cooling and heat exchange unit, and a product outlet, which are connected in sequence; The material side also includes a product return port, which is connected to the inlet and outlet control valve group; The product outlet is connected to the product return port via the filling machine unit; The material side also includes a one-way valve and a first reversing valve, which are arranged between the product return port and the inlet and outlet control valve group; The hot water side also includes a second reversing valve and a stop valve, which are arranged between the inlet and outlet control valve group and the hot water tank.

2. The UHT system according to claim 1, wherein: The material inlet is the cleaning liquid inlet; the product outlet is the cleaning liquid outlet; and the product return port is the cleaning liquid return port.

3. The UHT system according to claim 2, characterized in that The material balance tank and the degassing homogenization section heat exchanger are connected via a material pipeline; a material output pump and a flow meter are provided on the material pipeline; The material output pump delivers the material or cleaning liquid in the material balance tank to the degassing homogenizing section heat exchanger; The flow meter is used to detect the material flow or cleaning flow of the material output pump.

4. The UHT system according to claim 3, characterized in that Also includes: a steam heat exchanger connected to the sterilization section heat exchanger and used to provide high-temperature hot water to the sterilization section heat exchanger; The sterilization section heat exchanger receives the high-temperature hot water to perform heat exchange on the material or cleaning liquid.

5. The UHT system according to claim 4, characterized in that The steam heat exchanger is connected to the steam inlet through a steam pipe, and a steam proportional valve is provided on the steam pipe; The sterilization section heat exchanger is connected to the high temperature holding pipe through a pipeline. A temperature sensor is provided on the pipeline to detect the temperature of the material or cleaning liquid and feed it back to the steam proportional valve.

6. The UHT system according to claim 5, characterized in that Also includes: The conductivity detector is located between the product return port and the inlet and outlet control valve group, and is used to detect the concentration of the cleaning liquid and control the amount of chemical added.

7. The UHT system according to claim 1, characterized in that A hot water output pump is provided between the hot water tank and the heat recovery section heat exchanger to input the hot water in the hot water tank into the shell side of the heat recovery section heat exchanger.

8. The UHT system according to claim 1, characterized in that The external CIP station pumps the cleaning liquid into the material balance tank through the inlet and outlet control valve group. The material balance tank outputs the cleaning liquid through the material pipeline to the degassing and homogenizing section heat exchanger pipe, degassing and homogenizing unit for cleaning, and then returns to the sterilization section heat exchanger pipe for heat exchange of the cleaning liquid; The hot water tank buffers and stores the water in the medium system, and then inputs the hot water into the shell side of the heat recovery section heat exchanger, and then flows into the shell side of the steam heat exchanger; Steam is introduced into the steam heat exchanger tubes to heat the shell-side medium water, and the heated high-temperature hot water is introduced into the sterilization section heat exchanger to exchange heat with the cleaning liquid. The cleaning liquid then flows into the high-temperature holding pipe, the heat recovery section heat exchanger tubes, and the outlet cooling heat exchange unit until it reaches the product outlet, and then flows back to the product return port through the external filling machine unit. The cleaning liquid flows back to the material balance tank through the first reversing valve and the inlet and outlet control valve group; Wherein, the first reversing valve is in a closed state.

9. The UHT system according to claim 8, characterized in that The external CIP station pumps the cleaning liquid into the material balance tank through the inlet and outlet control valve group. The material balance tank outputs the cleaning liquid through the material pipeline to the degassing and homogenizing section heat exchanger pipe, degassing and homogenizing unit for cleaning, and then returns to the sterilization section heat exchanger pipe for heat exchange of the cleaning liquid; The cleaning liquid then enters the high-temperature holding pipe, the heat recovery section heat exchanger pipe, and the outlet cooling heat exchange unit until it reaches the product outlet, and then flows back to the product return port through the external filling machine unit. The cleaning fluid is delivered to the hot water tank through the first reversing valve and the second reversing valve; The hot water tank buffers and stores the cleaning liquid in the medium system, and then inputs the cleaning liquid into the shell side of the heat recovery section heat exchanger, and then flows into the shell side of the steam heat exchanger; Steam is introduced into the steam heat exchanger tube to directly heat the cleaning liquid. The heated cleaning liquid enters the sterilization section heat exchanger shell side and the degassing homogenization section heat exchanger shell side for cleaning, and then flows back to the first reversing valve through the second reversing valve, stop valve, and one-way valve, and continues to flow back to the material balance tank through the inlet and outlet control valve group; Among them, the first reversing valve, the second reversing valve and the stop valve are all in the open state.

10. The UHT system according to claim 1, characterized in that The first reversing valve and the second reversing valve are TL type reversing valves; the stop valve is an L type stop valve.

Images