Pasteurization system

Abstract

The utility model relates to a pasteurization system. The pasteurization system comprises a heating system, the heating system comprises a heating pipeline, a material heating heat exchanger, a retaining pipe, a liquid storage tank, a liquid circulating pipeline, a liquid heating heat exchanger and a steam pipeline; a first heat exchange pipeline and a holding pipe of the material heating heat exchanger are connected in series in the heating pipeline; a first pump device, a first flow meter and a first proportional valve are arranged on the heating pipeline, and the opening degrees of the first pump device and the first proportional valve can be adjusted according to the flow detected by the first flow meter; a second heat exchange pipeline of the material heating heat exchanger, the liquid storage tank and a third heat exchange pipeline of the liquid heating heat exchanger are connected in series in the liquid circulating pipeline; and a fourth heat exchange pipeline of the liquid heating heat exchanger is connected in series in the steam pipeline. According to the utility model, the sterilization temperature, flow and holding time can be conveniently adjusted, and the flow control of materials is more accurate.

Description

Technical Field

[0001] This utility model relates to the field of pasteurization technology, and in particular to a pasteurization system. Background Technology

[0002] The pasteurization devices currently used in laboratories are relatively limited in terms of process range, such as flow rate and time, and have poor control precision, which cannot meet the requirements of multiple experimental processes. Utility Model Content

[0003] The purpose of this invention is to provide a pasteurization system that allows for easy adjustment of sterilization temperature, flow rate, and holding time, and provides more precise control over material flow.

[0004] The purpose of this utility model is achieved as follows: a pasteurization system includes a heating system; the heating system includes a heating pipeline, a material heating heat exchanger, a holding pipe, a liquid storage tank, a liquid circulation pipeline, a liquid heating heat exchanger, and a steam pipeline; the first heat exchange pipeline and the holding pipe of the material heating heat exchanger are both connected in series in the heating pipeline, and the holding pipe is located near the outlet end of the heating pipeline; a first pump device, a first flow meter, and a first proportional valve are sequentially arranged along the material conveying direction on the heating pipeline, located between its inlet end and the material heating heat exchanger, the first pump device and the first proportional valve can adjust their respective openings according to the flow rate detected by the first flow meter; the second heat exchange pipeline of the material heating heat exchanger, the liquid storage tank, and the third heat exchange pipeline of the liquid heating heat exchanger are all connected in series in the liquid circulation pipeline; the fourth heat exchange pipeline of the liquid heating heat exchanger is connected in series in the steam pipeline.

[0005] In a preferred embodiment of this utility model, the first pump device is a screw pump, and the material heating heat exchanger is a wide-channel plate heat exchanger.

[0006] In a preferred embodiment of the present invention, a first cleaning parallel pipeline and a second cleaning parallel pipeline are respectively provided at the first pump device and the first proportional valve. The two ends of the first cleaning parallel pipeline are respectively connected to the heating pipelines at both ends of the first pump device, and a second pump device is provided on the first cleaning parallel pipeline. The two ends of the second cleaning parallel pipeline are respectively connected to the heating pipelines at both ends of the first proportional valve.

[0007] In a preferred embodiment of the present invention, the second pump device is a centrifugal pump, and a second flow meter is also provided on the heating pipeline and located between the first cleaning pipeline and the second cleaning pipeline. The second pump device can adjust the opening degree according to the flow rate detected by the second flow meter.

[0008] In a preferred embodiment of the present invention, the holding tube is a pipeline of a predetermined length formed by connecting at least one straight pipe and / or at least one bent pipe; a first temperature sensor and a second temperature sensor are respectively provided on the heating pipeline near the inlet and outlet ends of the holding tube; a first material bypass pipeline and a second material discharge switch valve are sequentially provided on the heating pipeline near its outlet end along the material conveying direction, and a first material discharge switch valve is provided on the first material bypass pipeline.

[0009] In a preferred embodiment of this utility model, a steam filter, a first pressure reducing valve, a normally open valve, and a steam regulating valve are sequentially arranged along the steam conveying direction on the steam pipeline between its inlet end and the liquid heating heat exchanger. A third temperature sensor is also provided on the liquid circulation pipeline near the outlet end of the third heat exchange pipeline. The steam regulating valve can adjust its opening degree according to the temperature detected by the third temperature sensor, or it can adjust its opening degree according to the temperature detected by the third temperature sensor and the temperature at the inlet end of the holding tube.

[0010] In a preferred embodiment of this utility model, a steam inlet switch valve, a steam bypass pipeline, a first steam parallel pipeline, and a second steam parallel pipeline are further provided on the steam pipeline. The steam inlet switch valve is located near the inlet end of the steam pipeline. One end of the steam bypass pipeline is connected to the steam pipeline between the steam filter and the first pressure reducing valve. Both ends of the first steam parallel pipeline are connected to the steam bypass pipeline, and a first discharge switch valve and a first steam trap are provided on the steam bypass pipeline between the two ends of the first steam parallel pipeline. A second discharge switch valve is provided on the first steam parallel pipeline. Both ends of the second steam parallel pipeline are connected to the steam pipeline between the liquid heating heat exchanger and the outlet end of the steam pipeline, and a third discharge switch valve and a second steam trap are provided on the steam pipeline between the two ends of the second steam parallel pipeline. A fourth discharge switch valve is provided on the second steam parallel pipeline.

[0011] In a preferred embodiment of the present invention, a liquid replenishment pipeline is also connected to the liquid storage tank. A liquid replenishment switch valve, an automatic switch valve and a first check valve are sequentially arranged on the liquid replenishment pipeline along the liquid delivery direction. A liquid level gauge is provided in the liquid storage tank. The automatic switch valve can be in the open state when the liquid level detected by the liquid level gauge is lower than the preset liquid level.

[0012] In a preferred embodiment of the present invention, the liquid storage tank is further connected to an exhaust balance pipeline. A second pressure reducing valve and a constant pressure discharge valve are sequentially arranged on the exhaust balance pipeline along the gas conveying direction. The constant pressure discharge valve can be in the open state when the gas pressure in the liquid storage tank is greater than the gas pressure at the outlet end of the second pressure reducing valve.

[0013] In a preferred embodiment of this utility model, the pasteurization system further includes a cooling system; the cooling system includes a cooling pipeline, a material cooling heat exchanger, a cold liquid inlet pipeline, and a cold liquid return pipeline. The inlet end of the cooling pipeline is connected to the outlet end of the heating pipeline in a way that allows it to be switched on and off. The fifth heat exchange pipeline of the material cooling heat exchanger is connected in series in the cooling pipeline, and the two ends of the sixth heat exchange pipeline of the material cooling heat exchanger are respectively connected to the outlet end of the cold liquid inlet pipeline and the inlet end of the cold liquid return pipeline.

[0014] In a preferred embodiment of this utility model, the material cooling heat exchanger is a wide-channel plate heat exchanger. An inlet switch valve and a second proportional valve are sequentially arranged along the liquid flow direction on the cold liquid inlet pipe. A second check valve and a return switch valve are also sequentially arranged along the liquid flow direction on the cold liquid return pipe. A fourth temperature sensor, a second material bypass pipe, and a fourth material discharge switch valve are sequentially arranged along the material conveying direction on the cooling pipe and between its outlet end and the material cooling heat exchanger. The second proportional valve can adjust its opening degree according to the temperature detected by the fourth temperature sensor. A third material discharge switch valve is provided on the second material bypass pipe.

[0015] As described above, the pasteurization system of this utility model can adjust the flow rate of the material by adjusting the opening of the first pump device and the first proportional valve. The combined adjustment and control of the first pump device and the first proportional valve can effectively improve the flow rate control accuracy. First, steam is used to heat the liquid, and then the heated liquid is used to heat the material, resulting in more uniform heating. By installing holding tubes of different lengths, the material can be maintained in the tubes for different preset times. Furthermore, different sterilization temperatures, flow rates, and holding times can be set according to the requirements of different products to ensure that the ideal sterilization effect is achieved without affecting the product's taste or composition. The system also features high flow rate control accuracy and uniform material heating temperature, which facilitates precise temperature control and better meets the requirements of multi-process, high-precision laboratory applications. Attached Figure Description

[0016] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0017] Figure 1 A schematic diagram of the heating system provided by this utility model.

[0018] Figure 2 A schematic diagram of the cooling system provided by this utility model.

[0019] Figure 3 This invention provides a first connection method for forming a retaining tube.

[0020] Figure 4 This invention provides a second connection method for forming a retaining tube.

[0021] Figure 5 This invention provides a third connection method for the holding tube.

[0022] Figure 6 This invention provides a fourth connection method for the holding tube.

[0023] Explanation of icon numbers:

[0024] 1. Heating pipeline; 11. First pump unit; 12. First cleaning and connecting pipeline; 121. Second pump unit; 122. First cleaning switch valve; 13. Second flow meter; 14. Second cleaning and connecting pipeline; 141. Second cleaning switch valve; 15. First flow meter; 16. First proportional valve; 171. First temperature sensor; 172. Second temperature sensor; 173. First thermometer; 18. First material bypass pipeline; 181. First material discharge switch valve; 19. Second material discharge switch valve;

[0025] 2. Material heating heat exchanger;

[0026] 3. Holding tube; 31. Holding box; 32. Single tube; 33. Bend;

[0027] 4. Liquid storage tank; 41. Liquid replenishment pipeline; 411. Liquid replenishment switch valve; 412. Automatic switch valve; 413. First check valve; 42. Exhaust balance pipeline; 421. Second pressure reducing valve; 422. Constant pressure discharge valve;

[0028] 5. Liquid circulation pipeline; 501. Liquid inlet pipeline; 502. Liquid return pipeline; 51. Third temperature sensor; 52. Second temperature gauge; 53. First pressure gauge; 54. Third pump device; 55. Liquid bypass pipeline; 551. Fifth discharge switch valve;

[0029] 6. Liquid heating heat exchanger;

[0030] 7. Steam pipeline; 71. Steam inlet switch valve; 72. Steam filter; 73. Steam bypass pipeline; 731. First discharge switch valve; 732. First steam trap; 74. First steam parallel pipeline; 741. Second discharge switch valve; 75. First pressure reducing valve; 76. Normally open valve; 77. Steam regulating valve; 78. Second steam parallel pipeline; 781. Fourth discharge switch valve; 791. Third discharge switch valve; 792. Second steam trap;

[0031] 8. Cooling piping; 81. Material cooling heat exchanger; 82. Fourth temperature sensor; 83. Fifth temperature gauge; 84. Second material bypass piping; 841. Third material discharge switch valve; 85. Fourth material discharge switch valve;

[0032] 91. Coolant inlet line; 911. Inlet switch valve; 912. Third temperature gauge; 913. Second pressure gauge; 914. Second proportional valve;

[0033] 92. Cold liquid return line; 921. Third pressure gauge; 922. Second check valve; 923. Fourth temperature gauge; 924. Return valve. Detailed Implementation

[0034] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0035] like Figures 1 to 6 As shown, this embodiment provides a pasteurization system, including a heating system. The heating system includes a heating pipeline 1, a material heating heat exchanger 2, a holding pipe 3, a liquid storage tank 4, a liquid circulation pipeline 5, a liquid heating heat exchanger 6, and a steam pipeline 7. The first heat exchange pipeline of the material heating heat exchanger 2 and the holding pipe 3 are both connected in series in the heating pipeline 1, and the holding pipe 3 is located near the outlet end of the heating pipeline 1. A first pump device 11, a first flow meter 15, and a first proportional valve 16 are sequentially arranged on the heating pipeline 1 and between its inlet end and the material heating heat exchanger 2 along the material conveying direction. The first pump device 11 and the first proportional valve 16 can adjust their respective openings according to the flow rate detected by the first flow meter 15. The second heat exchange pipeline of the material heating heat exchanger 2, the liquid storage tank 4, and the third heat exchange pipeline of the liquid heating heat exchanger 6 are all connected in series in the liquid circulation pipeline 5. The fourth heat exchange pipeline of the liquid heating heat exchanger 6 is connected in series in the steam pipeline 7.

[0036] The system includes a steam pipeline 7 for introducing steam, and a liquid storage tank 4 containing a pre-set liquid level, such as pure water. The material heating heat exchanger 2 has two heat exchange pipelines: a first heat exchange pipeline and a second heat exchange pipeline. The liquid heating heat exchanger 6 has two heat exchange pipelines: a third heat exchange pipeline and a fourth heat exchange pipeline. The material cooling heat exchanger 81 has two heat exchange pipelines: a fifth heat exchange pipeline and a sixth heat exchange pipeline. The liquid heating heat exchanger 6 heats the water in the liquid circulation pipeline 5 by exchanging heat with the high-temperature steam in the steam pipeline 7. The material heating heat exchanger 2 heats the material conveyed in the heating pipeline 1 by exchanging heat with the hot water in the liquid circulation pipeline 5. After being heated, the material is held in the holding pipe 3 for the required time until its temperature reaches the set temperature, at which point it is discharged.

[0037] Therefore, the pasteurization system in this embodiment can adjust the flow rate of the material by adjusting the opening of the first pump device 11 and the first proportional valve 16. The combined adjustment and control of the first pump device 11 and the first proportional valve 16 can effectively improve the flow rate control accuracy. The liquid is heated by steam first, and then the heated liquid is used to heat the material, resulting in more uniform heating of the material. By installing holding tubes 3 of different lengths, the material can be kept in the tubes for different preset times. Furthermore, different sterilization temperatures, flow rates, and holding times can be set according to the requirements of different products to ensure that the ideal sterilization effect is achieved without affecting the taste and composition of the product. The high flow rate control accuracy and uniform material heating temperature facilitate precise temperature control and better meet the requirements of multiple processes and high precision in the laboratory.

[0038] In practical applications, the entire system also includes a controller, which is electrically connected to the first pump device 11, the first flow meter 15 and the first proportional valve 16 mentioned above, in order to achieve automatic control and improve the automation, stability and reliability of the system.

[0039] Furthermore, the first pump device 11 is preferably a screw pump, and the material heating heat exchanger 2 is preferably a wide-channel plate heat exchanger.

[0040] The first pump unit 11 uses a screw pump, which can provide material conveying with a wider viscosity range; the material heating heat exchanger 2 and the material cooling heat exchanger 81 described below both use wide-channel plate heat exchangers, with the channel width preferably between 3.5mm and 4mm. While taking into account the high heat exchange efficiency of the plate heat exchanger, it can adapt to materials with a wide viscosity range; thus, it can better adapt to materials with a wide viscosity range and achieve pasteurization with a wide process range.

[0041] The liquid heating heat exchanger 6 described above can be a brazed heat exchanger, or other types of heat exchangers can be used as needed. The specific structures of the wide-channel plate heat exchanger and the brazed heat exchanger are existing structures.

[0042] The range of the first flow meter 15 mentioned above cannot be too large. In this embodiment, the maximum range of the first flow meter 15 is 1000L / h to ensure the control accuracy of the material flow rate.

[0043] Because the flow rates of the screw pump and the first proportional valve 16 are relatively small, they cannot meet the high flow rate requirements during cleaning. To meet the high flow rate requirements during pipeline cleaning, refer to... Figure 1A first cleaning and connecting pipeline 12 and a second cleaning and connecting pipeline 14 are respectively provided at the first pump device 11 and the first proportional valve 16. The two ends of the first cleaning and connecting pipeline 12 can be connected to the heating pipelines 1 at both ends of the first pump device 11, and a second pump device 121 is provided on the first cleaning and connecting pipeline 12. The two ends of the second cleaning and connecting pipeline 14 can be connected to the heating pipelines 1 at both ends of the first proportional valve 16.

[0044] The second pump device 121 is preferably a centrifugal pump to meet the requirements of high-flow-rate cleaning. A second flow meter 13 is also provided on the heating pipeline 1, located between the first cleaning parallel pipeline 12 and the second cleaning parallel pipeline 14. The second pump device 121 can adjust its opening degree according to the flow rate detected by the second flow meter 13. The second flow meter 13 should be a large-range flow meter; in this embodiment, the maximum range of the second flow meter 13 is 5000 L / h to meet the accuracy requirements of high-flow-rate cleaning.

[0045] Two first cleaning switch valves 122 are provided on the first cleaning and connecting pipeline 12 and at both ends of the second pump device 121, and two second cleaning switch valves 141 are provided on the second cleaning and connecting pipeline 14 and near its ends. During the feeding stage, both the first cleaning switch valves 122 and the second cleaning switch valves 141 are closed, and the first pump device 11 and the first proportional valve 16 can adjust their respective openings according to the flow rate detected by the first flow meter 15. During the cleaning stage, both the first cleaning switch valves 122 and the second cleaning switch valves 141 are open, and the first pump device 11 can adjust the pump opening according to the flow rate detected by the second flow meter 13. By setting two flow meters with different ranges, the accuracy of material flow rate and cleaning flow rate can be better met.

[0046] Furthermore, the retaining pipe 3 is a pipe of a predetermined length consisting of at least one straight pipe and / or at least one bend 33 connected together.

[0047] It is understood that the heating pipe 1 has a first interface and a second interface to connect to the inlet and outlet ends of the holding pipe 3, respectively. During installation, different numbers of straight pipes and / or bends 33 can be connected according to the required holding time to adapt to different flow rate requirements of the Parshall process.

[0048] Furthermore, to facilitate the assembly of the retaining tube 3, the pasteurization system also includes a retaining box 31. Multiple sets of retaining components are spaced apart from top to bottom within the retaining box 31. Each set of retaining components includes two horizontally spaced single tubes 32, with the first ends of the two single tubes 32 connected by corresponding bends 33. The first interface and the second interface are connected by a bend 33; or, the first interface, the first interface itself, and the second ends of each single tube 32 in at least one set of retaining components are connected by a corresponding number of bends 33 to form the retaining tube 3. The bends 33 here are generally U-shaped. By integrating some piping within the retaining box 31, installation only requires connecting the first and second interfaces, or connecting the first interface, the second interface, and the corresponding retaining components, to assemble retaining tubes 3 of different preset lengths, making operation much simpler.

[0049] For example, the retaining box 31 contains three sets of retaining components, which are respectively labeled as the upper retaining component, the middle retaining component, and the lower retaining component. In use, they can be arranged according to... Figure 3 As shown, the first interface and the second interface are connected by a bend 33 to form a retaining tube 3; or, it can be arranged according to... Figure 4 As shown, the first and second interfaces are respectively connected to the second ends of the two single tubes 32 in the upper retaining assembly via corresponding bends 33; or, they can be arranged as follows: Figure 5 As shown, the second ends of the two single tubes 32 in the upper retaining assembly are respectively connected to the first interface and the second end of one of the single tubes 32 in the middle retaining assembly via corresponding bends 33, and the second end of the other single tube 32 in the middle retaining assembly is connected to the second interface via a corresponding bend 33; or, it can also be arranged as follows Figure 6 As shown, the second ends of the two single tubes 32 in the upper retaining assembly are respectively connected to the first interface and the second end of one of the single tubes 32 in the middle retaining assembly through corresponding bends 33. The second ends of the two single tubes 32 in the lower retaining assembly are respectively connected to the second end of the other single tube 32 in the middle retaining assembly and the second interface through corresponding bends 33.

[0050] Of course, the specific number of components and connection method depends on the actual process requirements; this embodiment is only for illustrative purposes.

[0051] Furthermore, a first temperature sensor 171 and a second temperature sensor 172 are respectively provided on the heating pipeline 1 and near the inlet and outlet ends of the holding pipe 3; a first material bypass pipeline 18 and a second material discharge switch valve 19 are sequentially provided on the heating pipeline 1 and near its outlet end along the material conveying direction, and a first material discharge switch valve 181 is provided on the first material bypass pipeline 18.

[0052] The first material bypass pipe 18 is connected to the heating pipe 1 and located after the holding pipe 3, specifically between the second temperature sensor 172 and the outlet end of the heating pipe 1. The material is powered by a screw pump and enters the material heating heat exchanger 2 at a stable flow rate after passing through the first proportional valve 16. The preheated material heating heat exchanger 2 heats the material according to the set temperature. The heated material is held in the holding pipe 3 for a certain period of time. After the material is held in the holding pipe 3 for a certain period of time, the material that has not reached the set temperature is discharged through the first material bypass pipe 18 and the first material discharge switch valve 181, while the material that has reached the set temperature is discharged through the second material discharge switch valve 19 and enters the cooling pipe 8 described below.

[0053] The determination of whether the material temperature has reached the preset temperature can be based on whether the temperature before entering the holding tube 3 (i.e., the temperature detected by the first temperature sensor 171) reaches the preset temperature, or it can be based on whether the temperature after flowing out of the holding tube 3 (i.e., the temperature detected by the second temperature sensor 172) reaches the preset temperature. Which temperature is used as the judgment standard depends on the actual process requirements.

[0054] If necessary, a first temperature gauge 173 can also be installed on the heating pipe 1 between the holding pipe 3 and the first material bypass pipe 18, so that the operator can observe the temperature at that location on site and compare it with the temperature detected by the second temperature sensor 172 displayed on the screen, which is more conducive to precise temperature control.

[0055] The first cleaning switch valve 122, the second cleaning switch valve 141, the first material discharge switch valve 181, and the second material discharge switch valve 19 are all controlled by a controller and can all be butterfly valves. The controller is also electrically connected to the second pump device 121, the second flow meter 13, the first cleaning switch valve 122, the second cleaning switch valve 141, the first temperature sensor 171, the second temperature sensor 172, the first material discharge switch valve 181, and the second material discharge switch valve 19. During the feeding stage, the controller adjusts the opening of the first pump device 11 and the first proportional valve 16 based on the flow rate detected by the first flow meter 15. During the cleaning stage, the first proportional valve 16 is fully open, the first pump device 11 is fully open, and the controller adjusts the opening of the second pump device 121 based on the flow rate detected by the second flow meter 13.

[0056] Furthermore, a steam filter 72, a first pressure reducing valve 75, a normally open valve 76, and a steam regulating valve 77 are sequentially arranged along the steam transport direction on the steam pipeline 7 between its inlet end and the liquid heating heat exchanger 6. A third temperature sensor 51 is also provided on the liquid circulation pipeline 5 near the outlet end of the third heat exchange pipeline. The steam regulating valve 77 can adjust its opening degree according to the temperature detected by the third temperature sensor 51, or it can adjust its opening degree according to the temperature detected by the third temperature sensor 51 and the temperature at the inlet end of the holding pipe 3 (that is, the temperature detected by the first temperature sensor 171).

[0057] Furthermore, the steam pipeline 7 is also equipped with a steam inlet switch valve 71, a steam bypass pipeline 73, a first steam parallel pipeline 74, and a second steam parallel pipeline 78. The steam inlet switch valve 71 is located near the inlet end of the steam pipeline 7. One end of the steam bypass pipeline 73 is connected to the steam pipeline 7 between the steam filter 72 and the first pressure reducing valve 75. The two ends of the first steam parallel pipeline 74 are connected to the steam bypass pipeline 73. A first discharge switch valve 731 and a first steam trap 732 are provided on the steam bypass pipeline 73 and between the two ends of the first steam parallel pipeline 74. A second discharge switch valve 741 is provided on the first steam parallel pipeline 74. The two ends of the second steam parallel pipeline 78 are connected to the steam pipeline 7 between the liquid heating heat exchanger 6 and the outlet end of the steam pipeline 7. A third discharge switch valve 791 and a second steam trap 792 are provided on the steam pipeline 7 and between the two ends of the second steam parallel pipeline 78. A fourth discharge switch valve 781 is provided on the second steam parallel pipeline 78.

[0058] The other end of the steam bypass pipe 73 is an open end, and the first steam trap 732 is arranged near this open end. The outlet end of the steam pipe 7 is an open end, and the second steam trap 792 is arranged near this outlet end. The steam inlet switch valve 71, the first discharge switch valve 731, the second discharge switch valve 741, the third discharge switch valve 791, and the fourth discharge switch valve 781 are all manual valves, such as manual shut-off valves. The normally open valve 76 and the steam regulating valve 77 mentioned above are both controlled by a controller. The normally open valve 76 can be, for example, a pneumatic ball valve, which is open under normal conditions and closes when the temperature in the pipe exceeds a certain value. The steam regulating valve 77 can be, for example, a proportional valve, which can adjust its opening degree according to the temperature detected by the third temperature sensor 51 in the initial stage (i.e., the stage before the feeding stage), and adjust its opening degree according to the temperature detected by the third temperature sensor 51 and the first temperature sensor 171 in the feeding stage.

[0059] The aforementioned controller is also electrically connected to the first pressure reducing valve 75, the normally open valve 76, the steam regulating valve 77, and the third temperature sensor 51. In the initial stage, the controller can control the opening of the steam regulating valve 77 based on the temperature detected by the third temperature sensor 51 to adjust the temperature of the circulating water in the liquid circulation pipeline 5 to the set temperature. During the feeding stage, the controller can control the opening of the steam regulating valve 77 based on the temperatures detected by the third temperature sensor 51 and the first temperature sensor 171, using a corresponding algorithm (e.g., MRAC), to adjust the temperature of the circulating water in the liquid circulation pipeline 5 to the set temperature, thus maintaining a stable temperature. Through the cooperation of the controller with the steam regulating valve 77, the first temperature sensor 171, and the third temperature sensor 51, temperature regulation can be made more precise.

[0060] Furthermore, the storage tank 4 is also connected to a replenishment pipeline 41. A replenishment switch valve 411, an automatic switch valve 412 and a first check valve 413 are sequentially arranged on the replenishment pipeline 41 along the liquid conveying direction. A level gauge is provided in the storage tank 4. The automatic switch valve 412 can be in the open state when the liquid level detected by the level gauge is lower than the preset liquid level.

[0061] It is understood that the storage tank 4 has an inlet port, an outlet port, and a replenishment port, and the liquid heating heat exchanger 6 is arranged near the outlet port. The entire liquid circulation pipeline 5 consists of a liquid inlet pipeline 501 and a liquid return pipeline 502. The inlet and outlet ends of the liquid inlet pipeline 501 are connected to the outlet port and the inlet end of the second heat exchange pipeline, respectively. The inlet and outlet ends of the liquid return pipeline 502 are connected to the outlet end and the inlet port of the second heat exchange pipeline, respectively. The aforementioned third heat exchange pipeline is connected in series in the liquid inlet pipeline 501. Water in the storage tank 4 enters the third heat exchange pipeline through the liquid inlet pipeline 501, is heated by steam, and then enters the second heat exchange pipeline to heat the material. After heating, the liquid flows back to the storage tank 4 through the liquid return pipeline 502 to form a liquid circulation. A third pump device 54 is also provided on the liquid circulation pipeline 5 to facilitate liquid circulation. The third pump device 54 is arranged near the outlet port of the storage tank 4.

[0062] If necessary, a second temperature gauge 52 and a first pressure gauge 53 may also be installed on the liquid circulation pipeline 5, located between the outlet end of the third heat exchange pipeline and the inlet end of the second heat exchange pipeline, so that the operator can observe the temperature and pressure at that location.

[0063] The inlet end of the replenishment line 41 is connected to the corresponding replenishment tank, and the outlet end is connected to the replenishment port to automatically replenish the liquid in the storage tank 4 when the liquid level is low; generally, pure water is added. The replenishment switch valve 411 is a manual valve, such as a manual ball valve; the automatic switch valve 412 is controlled by a controller, such as a pneumatic ball valve. The first check valve 413 only allows liquid to flow towards the outlet end of the replenishment line 41.

[0064] The controller is also connected to the automatic switching valve 412 and the level gauge. When the liquid level in the storage tank 4 is lower than the preset liquid level, the controller controls the automatic switching valve 412 to open for replenishment. When the liquid level in the storage tank 4 reaches the preset liquid level, the automatic switching valve 412 is closed to maintain the stability of the liquid level in the storage tank 4.

[0065] Furthermore, the storage tank 4 is also connected to an exhaust balance pipe 42. A second pressure reducing valve 421 and a constant pressure discharge valve 422 are sequentially provided on the exhaust balance pipe 42 along the gas conveying direction. The constant pressure discharge valve 422 can be in the open state when the gas pressure in the storage tank 4 is greater than the gas pressure at the outlet end of the second pressure reducing valve 421.

[0066] The controller is also electrically connected to the second pressure reducing valve 421. This constant pressure discharge valve 422 can also be called a balancing valve, and its specific structure is the existing structure. Since steam generates gas when heating the water in the liquid circulation pipeline 5, when compressed gas enters the constant pressure discharge valve 422 through the second pressure reducing valve 421, if the gas pressure in the storage tank 4 is greater than the gas pressure at the outlet of the second pressure reducing valve 421, the constant pressure discharge valve 422 automatically opens and discharges the gas to ensure that the gas pressure in the storage tank 4 remains balanced with the gas pressure at the outlet of the second pressure reducing valve 421.

[0067] Typically, a liquid bypass line 55 is also connected to the liquid circulation line 5. One end of this line is located near the outlet of the storage tank 4, and a fifth drain valve 551 is installed on the liquid bypass line 55. The other end of the liquid bypass line 55 is an open end, and the fifth drain valve 551 is a manual valve, such as a manual butterfly valve. When the storage tank 4 is being drained or the system is not in operation, the fifth drain valve 551 is opened to drain the liquid.

[0068] Furthermore, refer to Figure 2The pasteurization system also includes a cooling system; the cooling system includes a cooling pipe 8, a material cooling heat exchanger 81, a cold liquid inlet pipe 91, and a cold liquid return pipe 92. The inlet end of the cooling pipe 8 is shunt-connected to the outlet end of the heating pipe 1. The fifth heat exchange pipe of the material cooling heat exchanger 81 is connected in series in the cooling pipe 8, and the two ends of the sixth heat exchange pipe of the material cooling heat exchanger 81 are respectively connected to the outlet end of the cold liquid inlet pipe 91 and the inlet end of the cold liquid return pipe 92. The cold liquid inlet pipe 91 is used to transport cold liquid, such as cold water. The material cooling heat exchanger 81 is used to exchange heat between the material transported in the cooling pipe 8 and the cold water delivered from the cold liquid inlet pipe 91 to cool the material.

[0069] Furthermore, an inlet switch valve 911 and a second proportional valve 914 are sequentially arranged along the liquid flow direction on the cold liquid inlet pipe 91, and a second check valve 922 and a return switch valve 924 are sequentially arranged along the liquid flow direction on the cold liquid return pipe 92; a fourth temperature sensor 82, a second material bypass pipe 84, and a fourth material discharge switch valve 85 are sequentially arranged along the material conveying direction on the cooling pipe 8 and between its outlet end and the material cooling heat exchanger 81. The second proportional valve 914 can adjust its opening degree according to the temperature detected by the fourth temperature sensor 82, and a third material discharge switch valve 841 is provided on the second material bypass pipe 84.

[0070] Both the inlet valve 911 and the return valve 924 are manual valves, such as manual butterfly valves. The third material discharge valve 841 and the fourth material discharge valve 85 are controlled by the controller, and can also be butterfly valves. The second check valve 922 only allows liquid to flow towards the outlet of the cold liquid return line 92. The controller is also electrically connected to the second proportional valve 914, the fourth temperature sensor 82, the third material discharge valve 841, and the fourth material discharge valve 85. Material reaching the set temperature in the heating line 1 is discharged through the second material discharge valve 19 into the cooling line 8. After being cooled by the material cooling heat exchanger 81, material not cooled to the set temperature is discharged through the second material bypass line 84 and the third material discharge valve 841. Material cooled to the set temperature is discharged through the fourth material discharge valve 85. The controller can adjust the opening of the second proportional valve 914 according to the temperature detected by the fourth temperature sensor 82 to ensure the cooling effect on the material.

[0071] In practical applications, the inlet end of the coolant inlet pipe 91 and the outlet end of the coolant return pipe 92 can be connected to the chilled water tank to form a chilled water circulation; or these two ends can be directly connected to the two ends of the corresponding chilled water pipes in the factory to form a chilled water circulation.

[0072] As needed, a third temperature gauge 912 and a second pressure gauge 913 can be installed on the cold liquid inlet pipeline 91 between the inlet switch valve 911 and the second proportional valve 914; a fourth temperature gauge 923 can be installed on the cold liquid return pipeline 92 between the return switch valve 924 and the second check valve 922; a third pressure gauge 921 can be installed between the second check valve 922 and the material cooling heat exchanger 81; and a fifth temperature gauge 83 can be installed on the cooling pipeline 8 between the fourth temperature sensor 82 and the second material bypass pipeline 84, so that the operator can observe the temperature and pressure at the corresponding locations.

[0073] Furthermore, the working principle of the entire pasteurization system is as follows:

[0074] (1) Material heating:

[0075] Before feeding materials, the liquid circulation pipeline 5 needs to be heated. After manually opening the steam inlet switch valve 71, the first discharge switch valve 731, the second discharge switch valve 741, the third discharge switch valve 791, and the fourth discharge switch valve 781 can be opened simultaneously. After the steam passes through the steam inlet switch valve 71 and the steam filter 72, one path discharges the condensate in the steam pipeline 7 through the first discharge switch valve 731, the first steam trap 732, and the second discharge switch valve 741. The other path reduces the pressure through the first pressure reducing valve 75 and then enters the liquid heating heat exchanger 6 through the normally open valve 76 and the steam regulating valve 77. Then, the condensate in the steam pipeline 7 is discharged through the third discharge switch valve 791, the second steam trap 792, and the fourth discharge switch valve 781. Alternatively, the second discharge valve 741 and the fourth discharge valve 781 can be opened first, while the first discharge valve 731 and the third discharge valve 791 remain closed. After the steam passes through the steam inlet valve 71 and the steam filter 72, one path discharges the condensate in the steam pipeline 7 through the second discharge valve 741, and the other path discharges the condensate in the steam pipeline 7 through the fourth discharge valve 781.

[0076] After steam is discharged from both the outlet end of the steam bypass line 73 and the outlet end of the steam line 7, the third discharge switch valve 791 and the fourth discharge switch valve 781 are closed, and the first discharge switch valve 731 and the third discharge switch valve 791 are opened so that the condensate in the steam line 7 can be discharged through the first steam trap 732 and the second steam trap 792.

[0077] Both the first cleaning switch valve 122 and the second cleaning switch valve 141 are closed. The material (such as skim milk and other dairy products) enters the second flow meter 13, the first flow meter 15 and the first proportional valve 16 through the first pump device 11. The flow rate of the material is regulated by the first pump device 11 and the first proportional valve 16 according to the flow rate detected by the first flow meter 15 to achieve a precise and stable flow rate. After the material passes through the material heating heat exchanger 2, it passes through the holding pipe 3 (the holding pipe 3 can be connected to pipes of different lengths as needed to change the holding time). Then the material will pass through the first material discharge switch valve 181 and the second material discharge switch valve 19. At this point, the material will be discharged through the first material discharge switch valve 181 or the second material discharge switch valve 19 according to the temperature detected by the first temperature sensor 171 or the temperature detected by the second temperature sensor 172.

[0078] (2) Material cooling:

[0079] Before the material is fed in, the material cooling heat exchanger 81 needs to be pre-cooled. Manually open the liquid inlet switch valve 911, and the chilled water enters the material cooling heat exchanger 81 through the second proportional valve 914. Then, it returns to the corresponding chilled water tank or the chilled water pipeline of the plant through the second check valve 922 and the liquid return switch valve 924 to form a cycle.

[0080] After precooling, the material passes through the material cooling heat exchanger 81 for cooling, and then reaches the third material discharge switch valve 841 and the fourth material discharge switch valve 85. At this point, the material is discharged through the third material discharge switch valve 841 or the fourth material discharge switch valve 85, depending on the temperature detected by the fourth temperature sensor 82.

[0081] (3) Equipment cleaning:

[0082] The first pump unit 11 and the first proportional valve 16 are fully open, and the first cleaning switch valve 122 and the second cleaning switch valve 141 are both open. The cleaning fluid is powered by the first pump unit 11 and the second pump unit 121. The first pump unit 11 is a screw pump, which can provide material conveying with a wider viscosity range. The second pump unit 121 is a centrifugal pump, which can meet the requirements of high-flow cleaning. The first flow meter 15 is a large-range flow meter, which can measure the large flow during cleaning. The two second cleaning switch valves 141 are high-flow pipeline bypass control valves. During cleaning, the cleaning fluid will flow through the entire material pipeline to achieve the purpose of thoroughly cleaning the material pipeline.

[0083] In summary, the pasteurization system in this embodiment has the following advantages:

[0084] (1) Dual PID Flow Control: Compared with ordinary flow control, this system uses dual PID regulation control. Through the dual PID action of the first flow meter 15 and the screw pump, and the first flow meter 15 and the first proportional valve 16, the flow rate can be controlled more precisely. Moreover, the screw pump used is controlled by a servo motor, which can precisely control the speed, thereby achieving the purpose of precise flow control. The first proportional valve 16 used has an equal percentage control structure. In the small flow range, the opening degree changes slowly, while in the large flow range, the opening degree changes rapidly, which can also better stabilize the flow rate control.

[0085] (2) Adaptive temperature control: The heating control uses steam to heat cold water into hot water, and the hot water then heats the material, resulting in a more uniform heating effect. Moreover, through the cooperation of the controller with the steam regulating valve 77, the second temperature sensor 172 and the first temperature sensor 171, the temperature regulation can be more precise, and the set temperature can be adjusted more quickly in the event of external interference.

[0086] (3) Flexible and replaceable retaining tube 3: The retaining tube 3 can be combined in different structures as needed. It can be connected to the first interface and the second interface through the corresponding bend 33, or connected to the first interface, the second interface and the corresponding retaining components, so that retaining tubes 3 of different preset lengths can be formed to adapt to different flow rate sanitizing process requirements.

[0087] (4) Adaptable to materials with a wide viscosity range: Both the material heating heat exchanger 2 and the material cooling heat exchanger 81 use wide-channel plate heat exchangers, which can adapt to materials with a wide viscosity range while taking into account the high heat exchange efficiency of plate heat exchangers. This system can pasteurize materials with a viscosity of 0-16000CP.

[0088] (5) This system can process materials up to 600L / H. It can heat materials to a maximum of 95℃ and cool them to a minimum of 7℃. The entire system is designed to meet food hygiene standards. Metal materials in contact with the product are made of 304 and 316 stainless steel, and sealing materials include EPDM, silicone, and Teflon, greatly improving the hygiene and safety of the food. The entire system can be modularly designed, with modules connected via corresponding pipelines, offering flexibility and ease of use.

[0089] (6) The whole system is a pasteurization system with a wide process range that can be precisely controlled, which makes up for the shortcomings of existing pasteurization equipment with low control accuracy and narrow process range. It can be applied to materials with a wide viscosity range to meet normal experiments or production.

[0090] The above are merely illustrative embodiments of this utility model and are not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A pasteurization system, characterized in that, Including heating systems; The heating system includes a heating pipeline, a material heating heat exchanger, a holding tube, a liquid storage tank, a liquid circulation pipeline, a liquid heating heat exchanger, and a steam pipeline. The first heat exchange pipeline of the material heating heat exchanger and the holding tube are both connected in series within the heating pipeline, with the holding tube positioned near the outlet end of the heating pipeline. A first pump device, a first flow meter, and a first proportional valve are sequentially arranged along the material conveying direction on the heating pipeline, between its inlet end and the material heating heat exchanger. The first pump device and the first proportional valve can adjust their respective openings according to the flow rate detected by the first flow meter. The second heat exchange pipeline of the material heating heat exchanger, the liquid storage tank, and the third heat exchange pipeline of the liquid heating heat exchanger are all connected in series within the liquid circulation pipeline. The fourth heat exchange pipeline of the liquid heating heat exchanger is connected in series within the steam pipeline.

2. The pasteurization system as described in claim 1, characterized in that, The first pump device is a screw pump, and the material heating heat exchanger is a wide-channel plate heat exchanger.

3. The pasteurization system as described in claim 1, characterized in that, A first cleaning and connecting pipeline and a second cleaning and connecting pipeline are respectively provided at the first pump device and the first proportional valve. The two ends of the first cleaning and connecting pipeline are respectively connected to the heating pipelines at both ends of the first pump device, and a second pump device is provided on the first cleaning and connecting pipeline. The two ends of the second cleaning and connecting pipeline are respectively connected to the heating pipelines at both ends of the first proportional valve.

4. The pasteurization system as described in claim 3, characterized in that, The second pump device is a centrifugal pump, and a second flow meter is also provided on the heating pipeline and between the first cleaning pipeline and the second cleaning pipeline. The second pump device can adjust the opening degree according to the flow rate detected by the second flow meter.

5. The pasteurization system as described in claim 1, characterized in that, The holding tube is a pipeline of a predetermined length formed by connecting at least one straight pipe and / or at least one bend; a first temperature sensor and a second temperature sensor are respectively provided on the heating pipeline near the inlet and outlet ends of the holding tube; a first material bypass pipeline and a second material discharge switch valve are sequentially provided on the heating pipeline near its outlet end along the material conveying direction, and a first material discharge switch valve is provided on the first material bypass pipeline.

6. The pasteurization system as described in claim 1, characterized in that, A steam filter, a first pressure reducing valve, a normally open valve, and a steam regulating valve are sequentially arranged along the steam delivery direction on the steam pipeline between its inlet end and the liquid heating heat exchanger. A third temperature sensor is also provided on the liquid circulation pipeline near the outlet end of the third heat exchange pipeline. The steam regulating valve can adjust its opening degree according to the temperature detected by the third temperature sensor, or it can adjust its opening degree according to the temperature detected by the third temperature sensor and the temperature at the inlet end of the holding tube.

7. The pasteurization system as described in claim 6, characterized in that, The steam pipeline is also equipped with a steam inlet switch valve, a steam bypass pipeline, a first steam parallel pipeline, and a second steam parallel pipeline. The steam inlet switch valve is located near the inlet end of the steam pipeline. One end of the steam bypass pipeline is connected to the steam pipeline between the steam filter and the first pressure reducing valve. Both ends of the first steam parallel pipeline are connected to the steam bypass pipeline. A first discharge switch valve and a first steam trap are provided on the steam bypass pipeline between the two ends of the first steam parallel pipeline. A second discharge switch valve is provided on the first steam parallel pipeline. The two ends of the second steam parallel pipeline are connected to the steam pipeline between the liquid heating heat exchanger and the outlet end of the steam pipeline, and a third discharge switch valve and a second steam trap are provided on the steam pipeline between the two ends of the second steam parallel pipeline, and a fourth discharge switch valve is provided on the second steam parallel pipeline.

8. The pasteurization system as described in claim 1, characterized in that, The liquid storage tank is also connected to a liquid replenishment pipeline. A liquid replenishment switch valve, an automatic switch valve, and a first check valve are sequentially arranged on the liquid replenishment pipeline along the liquid delivery direction. A liquid level gauge is installed inside the liquid storage tank. The automatic switch valve can be in the open state when the liquid level detected by the liquid level gauge is lower than the preset liquid level.

9. The pasteurization system as described in claim 1, characterized in that, The storage tank is also connected to an exhaust balance pipeline. A second pressure reducing valve and a constant pressure discharge valve are sequentially arranged on the exhaust balance pipeline along the gas delivery direction. The constant pressure discharge valve can be in the open state when the gas pressure in the storage tank is greater than the gas pressure at the outlet of the second pressure reducing valve.

10. The pasteurization system as described in claim 1, characterized in that, The pasteurization system also includes a cooling system; The cooling system includes cooling pipes, a material cooling heat exchanger, a cold liquid inlet pipe, and a cold liquid return pipe. The inlet end of the cooling pipe is connected to the outlet end of the heating pipe in a switchable manner. The fifth heat exchange pipe of the material cooling heat exchanger is connected in series in the cooling pipes. The two ends of the sixth heat exchange pipe of the material cooling heat exchanger are respectively connected to the outlet end of the cold liquid inlet pipe and the inlet end of the cold liquid return pipe.

11. The pasteurization system as described in claim 10, characterized in that, The material cooling heat exchanger is a wide-channel plate heat exchanger. An inlet switch valve and a second proportional valve are sequentially provided along the liquid flow direction on the cold liquid inlet pipe. A second check valve and a return switch valve are also sequentially provided along the liquid flow direction on the cold liquid return pipe. A fourth temperature sensor, a second material bypass pipeline, and a fourth material discharge switch valve are sequentially arranged along the material conveying direction on the cooling pipeline and between its outlet end and the material cooling heat exchanger. The second proportional valve can adjust its opening degree according to the temperature detected by the fourth temperature sensor. A third material discharge switch valve is provided on the second material bypass pipeline.

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