Steam-assisted preheating shell-and-tube heat exchange sterilization system and sterilization control method

Abstract

The present invention relates to the technical field of sterilization, and provides a steam-assisted preheating shell-and-tube heat exchange sterilization system and a sterilization control method. A first auxiliary preheating pipe section is added to the feed pipeline between the first preheating pipe section and the homogenizer, and the first steam preheating module is used to perform heat exchange on the first auxiliary preheating pipe section and the first preheating pipe section, so as to stabilize the preheating temperature of the material, especially stabilize the preheating temperature of the material entering the homogenizer in the low-temperature sterilization mode, so as to meet the homogenization temperature requirement during low-temperature sterilization, thereby facilitating the improvement of the homogenization effect, and further improving the sterilization effect of the material; during high-temperature sterilization, since the water temperature in the liquid pipeline can meet the heat exchange requirement of the first heat exchange preheating pipe section, the steam supply to the first steam heat exchanger can be stopped, so that the water flowing out from the second heat exchange sterilization pipe section after heat exchange enters the heat exchange circulation pipeline of the first heat exchange preheating pipe section for preheating to meet the homogenization temperature requirement, thereby meeting different sterilization temperature requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of sterilization, and in particular to a steam-assisted preheating shell-and-tube heat exchange sterilization system and a sterilization control method. Background Art

[0002] The multifunctional sterilization system has different sterilization temperatures due to the large difference in sterilization temperature. The corresponding sterilization temperature varies according to the different materials and products. For example, the sterilization temperature may be a higher 137°C or a lower 85°C. Since the preheating heat of the preheating section mainly comes from the heat of the sterilization section, when the sterilization temperature is at a low temperature (such as 85°C), the higher preheating temperature required to enter the homogenizer will cause the sterilization section to provide insufficient heat exchange heat. The sterilization temperature is only 85°C, and the heat used for heat recovery and heat exchange in the preheating section is seriously insufficient.

[0003] Therefore, the existing multifunctional sterilization system cannot meet the multi-temperature sterilization requirements of various types of products such as 137℃, 121℃, 85℃, etc., especially when sterilizing at low temperatures such as 85℃, when the sterilization temperature is low (such as 85℃), the required preheating temperature of 60-65℃ entering the homogenizer cannot be met, resulting in poor homogenization effect, affecting product quality, and further affecting the sterilization effect of the material. Therefore, there is an urgent need for a steam-assisted preheating shell-and-tube heat exchange sterilization system and a sterilization control method to meet the multifunctional sterilization system to meet various sterilization requirements, especially to meet the low-temperature sterilization requirements while achieving sterilization. Summary of the invention

[0004] The object of the present invention is to provide a steam-assisted preheating shell-and-tube heat exchange sterilization system and a sterilization control method to solve the problem that the existing multifunctional sterilization system cannot meet the heat exchange requirements of the preheating section during low-temperature sterilization.

[0005] In the first aspect, an embodiment of the present invention further provides a steam-assisted preheating shell-and-tube heat exchange sterilization system, comprising: a feed pipeline and a discharge pipeline; the feed pipeline is provided with a first preheating pipe section, a first auxiliary preheating pipe section, a second heat exchange sterilization pipe section, a third heat exchange sterilization pipe section and a fourth heat exchange sterilization pipe section in sequence along the feed direction; the discharge pipeline is provided with a first cooling pipe section, a second cooling pipe section, a third cooling pipe section and a fourth cooling pipe section in sequence along the discharge direction; a homogenizer is provided on the feed pipeline between the first auxiliary preheating pipe section and the second heat exchange sterilization pipe section, for The material flowing out of the first auxiliary preheating pipe section is homogenized; the homogenization temperature of the homogenizer needs to meet the preset temperature requirement; the first steam preheating module is used to exchange heat for the first preheating pipe section and / or the first auxiliary preheating pipe section, so that the temperature of the material after heat exchange from the first auxiliary preheating pipe section meets the preset temperature requirement; the first steam preheating module includes a first steam intake pipeline, a first steam heat exchanger, a hot water booster pump, a heat exchange pipe switching valve and a first water storage tank; the upper part of the first water storage tank is connected to the exchange valve of the second heat exchange sterilization pipe section through a first liquid pipeline. The bottom end of the first water storage tank is connected to the liquid inlet of the first steam heat exchanger through the second liquid pipeline, the hot water booster pump is arranged on the second liquid pipeline, and is used to transport the water in the first water storage tank to the first steam heat exchanger, the liquid outlet of the first steam heat exchanger is connected to the heat exchange circulation pipeline of the first auxiliary preheating pipe section through the third liquid pipeline, the heat exchange pipe switching valve is arranged on the heat exchange circulation pipeline of the first auxiliary preheating pipe section, and the heat exchange pipe switching valve is connected to the heat exchange circulation pipeline of the first preheating pipe section through the fourth liquid pipeline, Used to control the direct connection between the third liquid pipeline and the heat exchange circulation pipeline of the first preheating pipe section; one end of the steam inlet pipeline is connected to the air inlet of the first steam heat exchanger, and the other end is connected to the steam source; the first preheating pipe section is connected to the cooling pipeline of the second cooling pipe section through the fifth liquid pipeline, the cooling pipeline of the first cooling pipe section is connected to the cooling pipeline of the second cooling pipe section through the sixth liquid pipeline, and the cooling pipeline of the first cooling pipe section is connected to the heat exchange circulation pipeline of the third heat exchange sterilization pipe section and the fourth heat exchange sterilization pipe section through the seventh liquid pipeline.

[0006] Optionally, the steam-assisted preheating shell-and-tube heat exchange sterilization system also includes: a second steam heat exchange sterilization module, the second steam heat exchange sterilization module includes: a second steam air inlet pipeline, a second steam heat exchanger and a second water storage tank; the air inlet of the second steam heat exchanger is connected to the steam source through the second steam air inlet pipeline, the second steam heat exchanger is connected to the heat exchange circulation pipeline of the fourth heat exchange sterilization pipe section through the eighth liquid pipeline, and the second water storage tank is connected to the heat exchange circulation pipeline of the third heat exchange sterilization pipe section and the fourth heat exchange sterilization pipe section through the ninth liquid pipeline, thereby connecting to the seventh liquid pipeline.

[0007] Optionally, the steam-assisted preheating shell-and-tube heat exchange sterilization system also includes: a steam regulating valve and a material temperature detection component; the material temperature detection component is arranged on the feed pipeline between the first auxiliary preheating pipe section and the second heat exchange sterilization pipe section, and is used to detect the material temperature after heat exchange from the first auxiliary preheating pipe section; the steam regulating valve is arranged on the first steam inlet pipeline, and the steam regulating valve is controlled in linkage with the material temperature detection component, so as to adjust the steam flow entering the first steam heat exchanger according to the material temperature after heat exchange in the first auxiliary preheating pipe section.

[0008] Optionally, the steam-assisted preheating shell-and-tube heat exchange sterilization system also includes: a bypass valve; a bypass pipeline is arranged between the circulation pipelines of the first preheating pipe section, the bypass valve is arranged on the bypass pipeline, and the bypass valve is electrically connected to the material temperature detection component, and is used to adjust the flow rate of the bypass pipeline according to the temperature of the material flowing out of the first auxiliary preheating pipe section.

[0009] Optionally, the steam-assisted preheating shell-and-tube heat exchange sterilization system also includes: a retaining tube module; one end of the retaining tube module is connected to the feed pipeline, and the other end is connected to the discharge pipeline, which is used to determine the corresponding pipeline direction according to the different materials, thereby realizing different sterilization time control.

[0010] Optionally, the steam-assisted preheating shell-and-tube heat exchange sterilization system further includes: a balance cylinder and a third water storage tank; the balance cylinder and the third water storage tank are both connected to the feed pipeline at the front end of the first preheating pipe section.

[0011] Optionally, the steam-assisted preheating shell-and-tube heat exchange sterilization system further comprises: a tower water cooling module and an ice water cooling module;

[0012] The tower water cooling module is connected to the cooling pipeline of the third cooling pipe section, and is used to cool the material flowing through the third cooling pipe section;

[0013] The ice water cooling module is connected to the cooling pipeline of the fourth cooling pipe section and is used to cool the material flowing through the fourth cooling pipe section.

[0014] In a second aspect, an embodiment of the present invention further provides a steam-assisted preheating shell-and-tube heat exchange sterilization method. Based on the steam-assisted preheating shell-and-tube heat exchange sterilization system as described in the first aspect, the shell-and-tube heat exchange sterilization method comprises the following steps:

[0015] S100, the system starts, and the feed pipeline and discharge pipeline are cleaned and sterilized at 137℃;

[0016] S200, supplying circulating water into the balancing cylinder so that the circulating water level in the balancing cylinder is maintained at more than 50% of the cylinder volume;

[0017] S300, the circulating water in the balance cylinder is sequentially transported to the first preheating pipe section, the first auxiliary preheating pipe section, the second heat exchange sterilization pipe section, the third heat exchange sterilization pipe section and the fourth heat exchange sterilization pipe section, and the first steam preheating module is controlled to start so as to heat the circulating water flowing out of the fourth heat exchange sterilization pipe section to the corresponding sterilization temperature;

[0018] S400, the circulating water flows into the discharge pipeline after passing through the holding pipe module for a preset sterilization time, and is sequentially heat recovered through the first cooling pipe section and the second cooling pipe section;

[0019] S500, water in the discharge pipeline is cooled by tower water through the third cooling pipe section and cooled by ice water through the fourth cooling pipe section, and then introduced into the balance cylinder for circulation;

[0020] S600 discharges the circulating water in the balance cylinder to the remaining 15%~25% liquid level, supplies the material from the feed pipeline to the balance cylinder for material top water, thereby pushing the circulating water in the balance cylinder into the feed pipeline and discharged from the discharge outlet;

[0021] S700, after the balance cylinder is emptied, the material begins to enter the balance cylinder and is discharged from the end discharge pipeline at the same time. When either the material top water time or the material top water volume reaches the set value, the material from the discharge pipeline is discharged to the target tank;

[0022] S800, sterilizes the materials entering from the feed pipeline by steam heat exchange.

[0023] Optionally, in step S800, the step of sterilizing the material in the feed pipeline by steam heat exchange includes:

[0024] S810, for the material at the first sterilization temperature, the heat exchange pipe switching valve is actuated, thereby connecting the heat exchange circulation pipelines of the first preheating pipe section and the first auxiliary preheating pipe section, so that the hot water after heat exchange in the first steam heat exchanger can be passed into the first auxiliary preheating pipe section for heat exchange, so as to meet the homogenization temperature requirement of the homogenizer;

[0025] S820, for materials at the second sterilization temperature, close the steam regulating valve, the heat exchange tube switching valve does not operate, and the heat exchange circulation pipeline of the second heat exchange sterilization pipe section is directly connected to the heat exchange circulation pipeline of the first preheating pipe section through the first steam heat exchanger; wherein, the second sterilization temperature is higher than the first sterilization temperature.

[0026] Optionally, after step S800, the method further includes:

[0027] S900, when the production is finished, the materials in the balance cylinder are emptied;

[0028] S1000, circulating water is introduced into the balance cylinder again to push the materials in the feed pipeline and the discharge pipeline, and when either the water pushing time or the water pushing amount reaches a set value, the materials in the discharge pipeline are discharged;

[0029] S1100, after the water pushing is completed, water flushing is performed, and the pipeline is flushed according to the water flushing volume and the maximum water flushing time. After the cleaning is completed, the water circulation is entered to wait for the next production.

[0030] Optionally, in step S600, when the product material is supplied from the feed pipeline to the balancing cylinder for top watering, the preheating temperature is controlled in advance so that the preheating temperature control temperature is increased by 1.8°C-2.2°C in advance, and the requirement is met by slowly increasing the set value of PID, and the temperature increase rate is controlled to be 0.8°C / min-1.2°C / min.

[0031] Optionally, in step S810, the preheating temperature is adjusted by controlling the opening of the steam regulating valve, the hot water flow in the preheating section is controlled by the hot water booster pump, and the bypass valve is opened for fixed opening control according to parameter settings; in step S820, the steam regulating valve is adjusted to a closed state, the preheating temperature is adjusted by the bypass valve, and the hot water flow in the preheating section is controlled by the hot water booster pump.

[0032] Optionally, the bypass valve is opened at a fixed opening according to parameter settings and is set with the fixed opening in the water circulation simulation mode as a reference value; when the bypass valve is opened at a fixed opening according to parameter settings, an allowable preheating temperature fluctuation adjustment range is set accordingly.

[0033] Optionally, the allowable preheating temperature fluctuation adjustment range is set to 3°C-8°C. If the preheating temperature fluctuation is within the set allowable preheating temperature fluctuation adjustment range, the bypass valve is not adjusted and is controlled with a fixed opening; if the preheating temperature fluctuation is greater than the set allowable preheating temperature fluctuation adjustment range, the bypass valve is adjusted to bypass more hot water to the second cooling pipe section; if the preheating temperature fluctuation is less than the set allowable preheating temperature fluctuation adjustment range, the bypass valve is closed and more hot water enters the first preheating pipe section and the first auxiliary preheating pipe section.

[0034] Optionally, when production preparation is completed, first drain the balance cylinder, control the preheating temperature to decrease by 1.8℃-2.2℃, and slowly decrease it by adjusting the set value of PID to meet the requirement, and control the temperature reduction rate to be 0.8℃ / min-1.2℃ / min; when the equipment has drained the material and started water top loading, slowly control the preheating temperature back to the set preheating temperature, and slowly increase it by adjusting the set value of PID to meet the requirement, and control the temperature increase rate to be 0.8℃ / min-1.2℃ / min.

[0035] The embodiments of the present invention have at least the following technical effects:

[0036] The shell-and-tube heat exchange sterilization system and method with steam-assisted preheating provided in the embodiment of the present invention adds a first auxiliary preheating pipe section on the feed pipeline between the first preheating pipe section and the homogenizer, and cooperates with the first steam preheating module to exchange heat with the first preheating pipe section and the first auxiliary preheating pipe section, thereby stabilizing the preheating temperature of the material, especially stabilizing the preheating temperature of the material entering the homogenizer in the low-temperature sterilization mode, so as to solve the problem that the homogenization temperature requirement cannot be met due to insufficient preheating temperature during low-temperature sterilization, thereby helping to improve the homogenization effect, and then improve the sterilization effect of the material, so as to improve the quality level of the material; in addition, during high-temperature sterilization, since the water temperature in the liquid pipeline can meet the heat exchange requirement of the first preheating pipe section, the steam supply to the first steam heat exchanger can be stopped, so that the water flowing out from the second heat exchange sterilization pipe section after heat exchange directly enters the heat exchange circulation pipeline of the first preheating pipe section to preheat the material to meet the homogenization temperature requirement, thereby realizing a multifunctional sterilization system with different sterilization temperature requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1A schematic diagram of the overall structure of a shell-and-tube heat exchange sterilization system with steam-assisted preheating provided by an embodiment of the present invention;

[0039] Figure 2 A schematic diagram of the partial structure of a first steam preheating module of a shell-and-tube heat exchange sterilization system with steam-assisted preheating provided by an embodiment of the present invention;

[0040] Figure 3 A partial structural schematic diagram of a second steam heat exchange sterilization module of a shell-and-tube heat exchange sterilization system with steam-assisted preheating provided by an embodiment of the present invention;

[0041] Figure 4 A schematic diagram of the partial structure of a retaining tube module of a shell-and-tube heat exchange sterilization system with steam-assisted preheating provided by an embodiment of the present invention;

[0042] Figure 5 A schematic diagram of the partial structure of a cooling heat exchange pipe section of a shell-and-tube heat exchange sterilization system with steam-assisted preheating provided in an embodiment of the present invention;

[0043] Figure 6 A schematic flow chart of a steam-assisted preheating shell-and-tube heat exchange sterilization method provided in an embodiment of the present invention;

[0044] Figure 7 The embodiment of the present invention provides Figure 6 Specific flow chart of step S800 in FIG.

[0045] Reference numerals:

[0046] 1-first preheating pipe section; 2-first auxiliary preheating pipe section; 3-second heat exchange sterilization pipe section; 4-third heat exchange sterilization pipe section; 5-fourth heat exchange sterilization pipe section; 6-homogenizer; 7-first cooling pipe section; 8-second cooling pipe section; 9-third cooling pipe section; 10-fourth cooling pipe section; 100-feeding pipeline; 101-material temperature detection component; 200-discharge pipeline; 300-first steam preheating module; 301-first steam intake pipeline; 302-first steam heat exchanger; 303-steam regulating valve; 304-hot water booster pump; 305-first water storage tank; 306-exchanger Heat pipe switching valve; 307-bypass valve; 308-first liquid pipeline; 309-second liquid pipeline; 310-third liquid pipeline; 311-fourth liquid pipeline; 312-fifth liquid pipeline; 313-bypass pipeline; 314-sixth liquid pipeline; 315-seventh liquid pipeline; 400-second steam heat exchange sterilization module; 401-second steam heat exchanger; 402-second steam intake pipeline; 403-second water storage tank; 404-ninth liquid pipeline; 405-eighth liquid pipeline; 500-balance cylinder; 600-third water storage tank; 700-holding tube module. DETAILED DESCRIPTION

[0047] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Those skilled in the art will understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0049] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0050] Combination Figures 1 to 5 As shown, an embodiment of the present invention provides a shell-and-tube heat exchange sterilization system with steam-assisted preheating, comprising: a feed pipeline 100, a homogenizer 6, a discharge pipeline 200 and a first steam preheating module 300; the material to be sterilized flows into the feed pipeline 100 and is discharged from the discharge pipeline after heat exchange sterilization.

[0051] Specifically, the feed pipeline 100 is provided with a first preheating pipe section 1, a first auxiliary preheating pipe section 2, a second heat exchange sterilization pipe section 3, a third heat exchange sterilization pipe section 4 and a fourth heat exchange sterilization pipe section 5 in sequence along the feed direction. The material is preheated / steam heat exchange preheated and steam heat exchange sterilized in sequence through the first preheating pipe section 1 and / or the first auxiliary preheating pipe section 2, the second heat exchange sterilization pipe section 3, the third heat exchange sterilization pipe section 4 and the fourth heat exchange sterilization pipe section 5. During the heat exchange sterilization process, the heat exchange temperature of the fourth heat exchange sterilization pipe section 5 is the highest, which is convenient for multifunctional sterilization of the material at different temperatures such as high temperature (137°C, 121°C) / low temperature (85°C). The heat exchange temperature of the first preheating pipe section 1 and / or the first auxiliary preheating pipe section 2 is the lowest, which mainly plays a preheating role. By preheating the material, the temperature of the material entering the homogenizer is stably controlled at the optimal homogenization temperature (60-65°C).

[0052] A homogenizer 6 is provided on the feed pipeline 100 between the first auxiliary preheating pipe section 2 and the second heat exchange sterilization pipe section 3. The homogenizer 6 is used to homogenize the material flowing out of the first auxiliary preheating pipe section 2, which is equivalent to shear emulsification. The homogenization temperature of the homogenizer 6 needs to stably meet the preset temperature requirements, otherwise it will affect the subsequent product emulsification stabilization effect. Therefore, the embodiment of the present invention adds a first auxiliary preheating pipe section 2 and combines it with the first steam preheating module 300 for heat exchange, thereby heating the material after heat exchange through the first preheating pipe section 1 to meet the homogenization temperature requirement of the material entering the homogenizer 6 during low-temperature sterilization. Because the hot water from the second steam heat exchange sterilization module 400 cannot meet the preheating heat requirement of the material entering the homogenizer 6 during low-temperature sterilization, the supplementary heat exchange through the newly introduced steam in the first steam preheating module 300 can make up for the higher preheating temperature required when the sterilization temperature is at a low temperature (such as 85°C) to enter the homogenizer, which will cause the problem of insufficient heat exchange heat of the hot water provided by the sterilization section, thereby achieving stable homogenization temperature of the material entering the homogenizer 6 during low-temperature sterilization.

[0053] The discharge pipeline 200 is provided with a first cooling pipe segment 7, a second cooling pipe segment 8, a third cooling pipe segment 9 and a fourth cooling pipe segment 10 in sequence along the discharge direction; the material after high-temperature sterilization is sequentially passed through the first cooling pipe segment 7, the second cooling pipe segment 8, the third cooling pipe segment 9 and the fourth cooling pipe segment 10 for heat exchange cooling, and the heat exchange temperature is sequentially reduced, thereby achieving stable cooling of the material.

[0054] Furthermore, the first steam preheating module 300 is used to perform heat exchange for the first preheating pipe section 1 and / or the first auxiliary preheating pipe section 2, so that the temperature of the material after heat exchange from the first auxiliary preheating pipe section 2 meets the preset temperature requirement. The first steam preheating module 300 includes a first steam intake pipeline 301, a first steam heat exchanger 302, a hot water booster pump 304, a heat exchange pipe switching valve 306 and a first water storage tank 305; the upper part of the first water storage tank 305 is connected to the heat exchange circulation pipeline of the second heat exchange sterilization pipe section 3 through a first liquid pipeline 308, so that the hot water after heat exchange in the second heat exchange sterilization pipe section 3 can be circulated to the first water storage tank 305. The bottom end of the first water storage tank 305 is connected to the liquid inlet of the first steam heat exchanger 302 through the second liquid pipeline 309. The hot water booster pump 304 is arranged on the second liquid pipeline 309, and is used to transport the hot water in the first water storage tank 305 to the first steam heat exchanger 302 for heat exchange with steam, thereby increasing the water temperature in the pipeline through heat exchange, and then adjusting the preheating temperature of the material in the feed pipeline 100.

[0055] The liquid outlet of the first steam heat exchanger 302 is connected to the heat exchange circulation pipeline of the first auxiliary preheating pipe section 2 through the third liquid pipeline 310. A heat exchange pipe switching valve 306 is provided on the heat exchange circulation pipeline of the first auxiliary preheating pipe section 2. The heat exchange pipe switching valve 306 is connected to the heat exchange circulation pipeline of the first preheating pipe section 1 through the fourth liquid pipeline 311, and is used to control the direct connection between the third liquid pipeline 310 and the heat exchange circulation pipeline of the first preheating pipe section 1. One end of the steam intake pipeline is connected to the air inlet of the first steam heat exchanger 302, and the other end of the steam intake pipeline is connected to the steam source, so that the steam supplied by the steam source is used to heat the water in the liquid pipeline through the first steam heat exchanger 302.

[0056] Specifically, for materials at the first sterilization temperature (e.g., 85°C), the heat exchange pipe switching valve 306 is actuated, thereby connecting the heat exchange circulation pipelines of the first preheating pipe segment 1 and the first auxiliary preheating pipe segment 2, so that the hot water after heat exchange in the first steam heat exchanger 302 can be passed into the first auxiliary preheating pipe segment 2 for heat exchange, which is equivalent to further increasing the temperature of the material flowing into the homogenizer 6 to meet the homogenization temperature requirement of the homogenizer 6, which is conducive to improving the homogenization effect of the material. For materials at the second sterilization temperature (e.g., 135°C), since the sterilization temperature required for the material flowing out of the fourth heat exchange sterilization pipe segment 5 is relatively high, the hot water temperature of the fourth heat exchange sterilization pipe segment 5 is high, and the heat is high. After the hot water passes through the third heat exchange sterilization pipe segment 4 and the second heat exchange sterilization pipe segment 3 in turn, the temperature and heat are high. Therefore, the first auxiliary preheating pipe section 2 does not need to be opened, and there is no need to supplement steam for heat exchange, that is, the steam regulating valve 303 is closed, and the heat exchange pipe switching valve 306 is not actuated. The hot water in the heat exchange circulation pipeline of the second heat exchange and sterilization pipe section 3 is directly connected to the heat exchange circulation pipeline of the first preheating pipe section 1 through the first steam heat exchanger 302. In this way, the hot water after heat exchange from the second heat exchange and sterilization pipe section 3 directly flows to the first preheating pipe section 1 for further heat exchange, thereby stably achieving the preheating of the material entering the homogenizer.

[0057] The first preheating pipe segment 1 is connected to the cooling pipeline of the second cooling pipe segment 8 through the fifth liquid pipeline 312, so that after heat exchange with the first preheating pipe segment 1, further heat exchange is performed with the high-temperature material in the second cooling pipe segment 8, thereby realizing heat recovery and utilization. The cooling pipeline of the first cooling pipe segment 7 is connected to the cooling pipeline of the second cooling pipe segment 8 through the sixth liquid pipeline 314, and the cooling pipeline of the first cooling pipe segment 7 is connected to the heat exchange circulation pipeline of the third heat exchange sterilization pipe segment 4 and the fourth heat exchange sterilization pipe segment 5 through the seventh liquid pipeline 315, thereby connecting the liquid pipeline of the first steam preheating module 300 with the liquid pipeline of the second steam heat exchange sterilization module 400.

[0058] The shell-and-tube heat exchange sterilization system with steam-assisted preheating provided in an embodiment of the present invention increases the preheating temperature of the material by adding a first auxiliary preheating pipe section 2 to the feed pipeline 100 between the first preheating pipe section 1 and the homogenizer 6, and cooperates with the first steam preheating module 300 to exchange heat with the first auxiliary preheating module, thereby solving the problem that the homogenization temperature requirement cannot be met due to insufficient preheating temperature during low-temperature sterilization, which is beneficial to improving the homogenization effect, and then improving the product emulsification stability effect of the material, so as to improve the material quality level; in addition, during high-temperature sterilization, since the water temperature in the liquid pipeline can meet the heat exchange requirement of the first heat exchange preheating pipe section, the steam supply to the first steam heat exchanger 302 can be stopped, so that the water flowing out from the second heat exchange sterilization pipe section after heat exchange directly enters the heat exchange circulation pipeline of the first heat exchange preheating pipe section to preheat the material to meet the homogenization temperature requirement, thereby realizing a multifunctional sterilization system with different sterilization temperature requirements.

[0059] In some embodiments, continue to refer to Figure 1 and Figure 3 As shown, the steam-assisted preheating shell-and-tube heat exchange sterilization system provided in the embodiment of the present invention also includes: a second steam heat exchange sterilization module 400; the second steam heat exchange sterilization module 400 includes: a second steam air intake pipeline 402, a second steam heat exchanger 401 and a second water storage tank 403, the air intake of the second steam heat exchanger 401 is connected to the steam source through the second steam air intake pipeline, the second steam heat exchanger 401 is connected to one end of the heat exchange circulation pipeline of the fourth heat exchange sterilization pipe section 5 through the eighth liquid pipeline 405, and the second water storage tank 403 is connected to the heat exchange circulation pipeline of the fourth heat exchange sterilization pipe section 5 through the ninth liquid pipeline 404 is connected to the heat exchange circulation pipeline of the third heat exchange sterilization pipe section 4 and the fourth heat exchange sterilization pipe section 5, and thus connected to the seventh liquid pipeline 315. In this way, the liquid pipelines of the second steam heat exchange sterilization module 400 and the first steam preheating module 300 are connected. During high-temperature sterilization, only the second steam heat exchanger 401 needs to be turned on for heat exchange sterilization. During low-temperature sterilization, the second steam heat exchanger 401 and the first steam heat exchanger 302 need to be turned on for heat exchange preheating and sterilization, so as to solve the problem that the homogenization temperature requirement cannot be met due to insufficient heat exchange in the preheating section during low-temperature heat exchange sterilization.

[0060] It can be understood that the second steam heat exchange sterilization module 400 is connected to the liquid pipeline of the first steam preheating module 300. During heat exchange sterilization, the heat exchange temperature of the second steam heat exchange sterilization module 400 is higher than the heat exchange temperature of the first steam preheating module 300. During high-temperature sterilization, the first steam preheating module 300 does not perform steam heat exchange, and directly uses the second steam heat exchange sterilization module 400 to perform heat exchange sterilization and preheating on each heat exchange preheating pipe section.

[0061] Alternatively, if Figure 1 and Figure 2 The steam-assisted preheating shell-and-tube heat exchange sterilization system provided in the embodiment of the present invention further includes: a steam regulating valve 303 and a material temperature detection component 101. The material temperature detection component 101 is arranged on the feed pipeline 100 between the first auxiliary preheating pipe section 2 and the second heat exchange sterilization pipe section 3, and is used to detect the temperature of the material after preheating from the first auxiliary preheating pipe section 2.

[0062] The steam regulating valve 303 is arranged on the first steam inlet pipeline 301, and the steam regulating valve 303 is controlled in linkage with the material temperature detection component 101, so as to adjust the steam flow entering the first steam heat exchanger 302 according to the material temperature after heat exchange in the first auxiliary preheating pipe section 2. Specifically, when the material temperature after heat exchange in the first auxiliary preheating pipe section 2 is lower than the homogenization temperature requirement of the homogenizer 6 (for example: 65°C), the valve opening of the steam regulating valve 303 can be increased, thereby increasing the water temperature flowing through the first auxiliary preheating pipe section 2 to increase the preheating temperature of the material; when the material temperature after heat exchange in the first auxiliary preheating pipe section 2 exceeds the homogenization temperature requirement of the homogenizer 6, the valve opening of the steam regulating valve 303 can be appropriately reduced, thereby reducing the steam consumption.

[0063] It should be noted that Figure 2 and Figure 3 The thick arrow on the feed pipeline 100 indicates the flow direction of the material, and the thin arrows on the pipelines in the first steam preheating module 300 and the second steam heat exchange sterilization module 400 indicate the flow direction of the hot water.

[0064] Alternatively, if Figure 1 and Figure 2 As shown, the steam-assisted preheating shell-and-tube heat exchange sterilization system provided in the embodiment of the present invention further includes: a bypass valve 307 .

[0065] Specifically, a bypass pipeline 313 is arranged between the circulation pipelines of the first preheating pipe section 1, and a bypass valve 307 is arranged on the bypass pipeline 313. The bypass valve 307 is electrically connected to the material temperature detection component 101, and is used to adjust the flow of the bypass pipeline 313 according to the temperature of the material flowing out of the first auxiliary preheating pipe section 2. After the bypass pipeline 313 is connected, a part of the circulating water flows directly to the second cooling pipe section 8 without passing through the first preheating pipe section 1, thereby changing the hot water flow entering the first preheating pipe section 1 and / or the first auxiliary preheating pipe section 2, and adjusting its heat exchange capacity.

[0066] In some embodiments, continue to refer to Figure 1 , Figure 3 and Figure 4 The steam-assisted preheating shell-and-tube heat exchange sterilization system also includes: a retaining tube module 700; one end of the retaining tube module 700 is connected to the feed pipeline 100, and the other end is connected to the discharge pipeline, which is used to determine the corresponding pipeline direction according to the different materials, thereby realizing different sterilization time control.

[0067] Specifically, the holding pipe module 700 includes a plurality of different pipeline interfaces, the feed pipeline 100 and the discharge pipeline 200 are connected to the interfaces of the holding pipe module 700, and a plurality of sterilization pipelines of different lengths are arranged in the holding pipe module 700. Different sterilization pipelines correspond to different sterilization times (the time the material stays in the sterilization pipeline). The corresponding pipeline interface is selected according to different material sterilization time requirements. For example, Figure 4 As shown, if the required sterilization time is 5 seconds, select the pipeline interface numbered a to be connected; if the required sterilization time is 10 seconds, select the pipeline interfaces numbered b and c to be connected. In this way, the same sterilization system can be used to sterilize materials with various sterilization temperature requirements and sterilization time requirements. It should be noted that the connecting pipelines between the heat exchange sterilization pipe sections before the pipe module 700 are called feed pipelines 100, and the connecting pipelines between the cooling pipe sections after the pipe module 700 are called discharge pipelines 200. Figure 4 The arrows in show the flow direction of the material into and out of the holding tube module 700.

[0068] In some embodiments, continue to refer to Figure 1 The shell-and-tube heat exchange sterilization system with steam-assisted preheating provided in the embodiment of the present invention also includes: a balance cylinder 500 and a third water storage tank 600; during SIP sterilization, the balance cylinder 500 supplies water to the third water storage tank 600. After reaching a certain liquid level, the balance cylinder 500 is bypassed, so that the third water storage tank 600, the feed pipeline 100 and the discharge pipeline 200 form circulating water. During the SIP sterilization and cooling stage, the balance cylinder 500 is cut back. When there is no liquid level in the third water storage tank 600, the third water storage tank 600 is cut off, so that the balance cylinder 500, the feed pipeline 100 and the discharge pipeline 200 form circulating water. The balance cylinder 500 is mainly used for caching materials and water to ensure the normal operation of the system. It should be noted that the last section of the discharge pipeline 200 is the fourth cooling pipe section 10, that is, the cooling pipeline of the fourth cooling pipe section 10 is connected through the connecting pipeline ( Figure 1 Similarly, the discharge pipeline 200 is connected to the balance cylinder 500 through the connecting pipeline ( Figure 1 The third water storage tank 600 (not shown) is connected to form a circulating water loop.

[0069] In the water circulation simulation mode of this embodiment, water is passed into the balancing cylinder 500, and finally the water cooled by the fourth cooling pipe segment 10 circulates into the balancing cylinder 500, so as to realize the water circulation simulation before the material is fed. Through the water circulation simulation, the water inlet temperature of the balancing cylinder 500 and the pipeline is controlled to be the same as the material feed temperature, and the temperature of the water entering the balancing cylinder 500 (i.e., the temperature of the water after passing through the fourth cooling pipe segment 10) connected to the balancing cylinder 500 is the same as the product feed temperature, so as to reduce the adverse effects caused by the untimely adjustment of valves, flow, temperature, pressure, etc. caused by the large temperature fluctuation in the pipeline when the material is topped with water during product production; at the same time, the preheating heat exchange pipe segment and the sterilization segment are put into the near-production mode in advance through the water circulation mode, and the control parameters such as valve opening, material flow, temperature, pressure, etc. in the pipeline system are obtained in advance, which is conducive to the rapid preheating and sterilization of the product when the product is fed, and avoids the production instability caused by the untimely adjustment of the control parameters such as valve opening, material flow, temperature, pressure, etc. in the pipeline system when the product is fed, and the adjustment range is too large, which is conducive to improving the sterilization efficiency of the product and the stability of the system, thereby improving the product quality.

[0070] In some embodiments, see Figure 1 and Figure 5 The steam-assisted preheating shell-and-tube heat exchange sterilization system provided in this embodiment also includes: a tower water cooling module and an ice water cooling module. Among them, the tower water cooling module is connected to the cooling pipeline of the third cooling pipe segment 9, and is used to cool the material flowing through the third cooling pipe segment 9. The ice water cooling module is connected to the cooling pipeline of the fourth cooling pipe segment 10, and is used to further cool the material flowing through the fourth cooling pipe segment 10, so as to meet the filling requirements of the material and save energy under the premise of ensuring the stability of the material temperature. It should be noted that Figure 5 The arrows on the middle discharge pipe 200 indicate the flow direction of the material, while the arrows on the cooling pipes on the second cooling pipe section 8 and the first cooling pipe section 7 indicate the flow direction of the water; Figure 5 The arrow on the connecting pipe between the tower water in the middle and the third cooling pipe section 9 indicates the inflow direction of the tower water. Figure 5 The arrow on the connecting pipe between the tower water in the middle lower part and the third cooling pipe section 9 indicates the outflow direction of the tower water. Figure 5 The arrow on the connecting pipe between the ice water in the middle and the fourth cooling pipe section 10 indicates the inflow direction of the ice water. Figure 5 The arrow on the connecting pipeline between the tower water in the lower middle part and the fourth cooling pipe section 10 indicates the outflow direction of the ice water.

[0071] like Figure 6 As shown, an embodiment of the present invention further provides a steam-assisted preheating shell-and-tube heat exchange sterilization method. Based on the steam-assisted preheating shell-and-tube heat exchange sterilization system in the aforementioned embodiment, the shell-and-tube heat exchange sterilization method includes the following steps:

[0072] S100, the system starts, and the feed pipeline and discharge pipeline are cleaned and sterilized at 137℃.

[0073] Specifically, the cleaning in this step can be performed automatically according to the program steps using concentrated acid and concentrated alkali. The feeding pipeline and the discharge pipeline are sterilized by heating the hot water pipeline through the second steam heat exchange sterilization module 400 so that the water on the product side reaches the sterilization temperature through heat exchange, and the discharge pipeline flows back to the third water storage tank 600 to form a cycle to sterilize the equipment. After sterilization, the temperature is gradually reduced and the third water storage tank 600 is removed and returned to the balance cylinder. The temperature of each part of the water cycle is adjusted according to the production temperature.

[0074] S200, circulating water is supplied to the balancing cylinder so that the circulating water level in the balancing cylinder is maintained at more than 50% of the cylinder volume.

[0075] Specifically, the balancing cylinder ensures a relatively high water level in the initial stage to stably supply circulating water to the feed pipeline.

[0076] S300, transport the circulating water in the balance cylinder to the first preheating pipe section, the first auxiliary preheating pipe section, the second heat exchange sterilization pipe section, the third heat exchange sterilization pipe section and the fourth heat exchange sterilization pipe section in sequence, and control the first steam preheating module to start so as to heat the circulating water flowing out of the fourth heat exchange sterilization pipe section to the corresponding sterilization temperature.

[0077] S400, the circulating water flows into the discharge pipeline after passing through the holding pipe module for a preset sterilization time, and is sequentially heat recovered through the first cooling pipe section and the second cooling pipe section.

[0078] S500, the water in the discharge pipeline is cooled by tower water through the third cooling pipe section and cooled by ice water through the fourth cooling pipe section, and then introduced into the balance cylinder for circulation.

[0079] Specifically, the gradient cooling of the material is achieved through two-stage cooling and heat exchange, which is beneficial to improving the heat exchange efficiency of the material and makes the final discharged material at a lower temperature level, so as to achieve a stable filling temperature.

[0080] The above-mentioned S200-S500 realizes water circulation simulation production, that is, before the product materials enter the system for sterilization, water is introduced into the system to realize water circulation simulation mode production. In the water circulation simulation mode, water is passed into the balance cylinder 500, and finally the water cooled by the fourth cooling pipe segment 10 circulates into the balance cylinder 500, so as to realize the water circulation simulation before the material is fed. Through the water circulation simulation, the water inlet temperature of the balance cylinder 500 and the pipeline is controlled to be the same as the material feed temperature, and the temperature of the water entering the balance cylinder 500 (i.e., the temperature of the water after passing through the fourth cooling pipe segment 10) connected to the balance cylinder 500 is the same as the product feed temperature, so as to reduce the adverse effects caused by the untimely adjustment of valves, flow, temperature, pressure, etc. caused by the large temperature fluctuation in the pipeline when the material is topped with water during product production; at the same time, the preheating heat exchange pipe segment and the sterilization segment are put into the near-production mode in advance through the water circulation mode, and the control parameters such as valve opening, material flow, temperature, pressure, etc. in the pipeline system are obtained in advance, which is conducive to the rapid preheating and sterilization of the product when the product is fed, and avoids the production instability caused by the untimely adjustment of the control parameters such as valve opening, material flow, temperature, pressure, etc. in the pipeline system when the product is fed, and the adjustment range is too large, which is conducive to improving the sterilization efficiency of the product and the stability of the system, thereby improving the product quality.

[0081] S600, discharge the circulating water in the balance cylinder to the remaining 15%~25% liquid level, supply the material from the feed pipeline to the balance cylinder for material top water, so that the circulating water in the balance cylinder is pushed into the feed pipeline and discharged from the discharge outlet.

[0082] Optionally, when the material is supplied from the feed pipeline to the balance cylinder for water top-up, because the product characteristics and water characteristics are different (the difference lies in the different dry matter content of the product, the higher the dry matter content, the higher the heat demand, the more viscous the product, and the more heat absorption is compared with water), the preheating temperature is controlled in advance, so that the preheating temperature control temperature is increased by 1.8℃-2.2℃ in advance, preferably 2℃ (because of the different dry matter content, when the water material is switched, the heat demand is low during the water circulation, and the heat demand is high when the material top-up is applied. If the temperature is not raised in advance, the preheating temperature will drop rapidly, that is, the preheating temperature is affected by the different characteristics of the material and water, resulting in a rapid drop in the preheating temperature, resulting in unstable sterilization temperature later, so the temperature is raised by 1.8℃-2.2℃ in advance when the material top-up is applied. In addition, the temperature should be raised and lowered slowly, and the temperature can be adjusted by adjusting the PID (Proportional Integral Derivative, proportional integral differential) set value is slowly increased to meet the requirements, and the temperature increase rate is controlled to be 0.8℃ / min-1.2℃ / min, and the preferred temperature increase rate is 1℃ / min, to prevent the system from being unstable due to too fast temperature changes, for example: control the temperature to increase by 2℃ in 120 seconds. When the water in the pipeline has been emptied and the feeding begins, the temperature is slowly controlled back to the set temperature, and the temperature reduction rate is controlled to be 0.8℃ / min-1.2℃ / min, and the preferred temperature reduction rate is 1℃ / min, to prevent the system from being unstable due to too fast temperature changes, for example: control the temperature to decrease by 2℃ in 120 seconds.

[0083] S700, after the balance cylinder is emptied, the material begins to enter the balance cylinder and is discharged from the end discharge pipeline at the same time. When either the material top water time or the material top water volume reaches the set value, the material in the discharge pipeline is discharged to the target tank.

[0084] S800, sterilizes the materials from the feed pipeline by steam heat exchange.

[0085] In some embodiments, Figure 7 As shown, in step S800, the material in the feed pipeline is sterilized by steam heat exchange, which specifically includes:

[0086] S810, for the material at the first sterilization temperature, the heat exchange pipe switching valve is actuated, thereby connecting the heat exchange circulation pipelines of the first preheating pipe section and the first auxiliary preheating pipe section, so that the hot water after heat exchange in the first steam heat exchanger can be passed into the first auxiliary preheating pipe section for heat exchange, so as to meet the homogenization temperature requirement of the homogenizer. The first sterilization temperature is preferably a low temperature of 85°C.

[0087] Specifically, the heat exchange tube switching valve 306 is actuated to connect the first preheating tube segment 1 (consisting of 4 preheating tube heat exchangers) and the first auxiliary preheating tube segment 2 (consisting of 6 preheating tube heat exchangers) to form 10 preheating tube heat exchangers. The heat exchange path is extended by these two preheating sections, which can provide sufficient heat exchange conditions for heat supplement and heat exchange when heat is insufficient during low-temperature sterilization, so as to facilitate low-temperature sterilization, such as the preheating temperature reaching the set requirement at 85°C.

[0088] In the specific operation process, the preheating temperature is adjusted by controlling the opening of the steam regulating valve 303, the hot water flow of the preheating section is controlled by the hot water booster pump 304, and the bypass valve 307 is opened according to the parameter setting to control the fixed opening in a normal output range, which will not be too small or too large when stable, which is conducive to improving the stability of system temperature regulation. The hot water flow control of the hot water booster pump 304 and the fixed value control of the bypass valve 307 are conducive to the stability of the pipeline flow and reduce the fluctuations of the system flow and temperature. The steam regulating valve 303 adjusts the preheating temperature. The steam regulating valve is used as the main regulation to reduce the variables of the system control regulation, which is conducive to accurate temperature regulation and avoids the problems of large flow fluctuations and large temperature fluctuations in the system caused by the independent regulation of the hot water booster pump 304, the bypass valve 307, and the steam regulating valve 303. At the same time, by using steam heating compensation, the high viscosity material has a large initial heat absorption, the preheating section temperature fluctuates greatly, and the sterilization section returns the hot water temperature too low, resulting in insufficient heat and other situations, which is more conducive to the stable control of the preheating section temperature when processing low-temperature materials.

[0089] S820, for the material of the second sterilization temperature, close the steam regulating valve, the heat exchange pipe switching valve does not operate, and the heat exchange circulation pipeline of the second heat exchange sterilization pipe section is directly connected to the heat exchange circulation pipeline of the first preheating pipe section through the first steam heat exchanger; wherein, the second sterilization temperature (for example: 135°C) is higher than the first sterilization temperature (for example: 85°C). Specifically, the steam regulating valve 303 is adjusted to be in a closed state, and the four preheating shell-and-tube heat exchangers are not operated. When not in operation, the heat exchange circulation pipeline of the second heat exchange sterilization pipe section 3 is directly connected to the first preheating pipe section. The hot water booster pump 304 controls the hot water flow rate of the preheating section, and the fixed flow rate supplied by the pump is controlled to ensure that the state of the fluid supplied in the pipeline is stable (including flow rate, temperature, pressure, etc.). Preferably, according to different products, a fixed flow rate of 1.2-1.5 times the product flow rate is set, which makes it easier for the bypass valve 307 to accurately adjust the preheating temperature. The preheating temperature is adjusted by the bypass valve 307, and the flow to the first preheating pipe section 1 is controlled by the opening of the bypass valve 307 to more accurately control the preheating temperature of the first preheating pipe section 1; the hot water booster pump 304 is used to control the hot water flow in the preheating section to be stable, and the bypass valve 307 is used to adjust the preheating temperature. The cooperation of the two can achieve more accurate control of the preheating temperature, avoiding problems such as large flow fluctuations and large temperature fluctuations in the system caused by independent adjustment of the hot water booster pump 304 and the bypass valve 307.

[0090] Optionally, the bypass valve 307 is opened at a fixed opening according to parameter settings, with the fixed opening in the water circulation simulation mode being set as a reference value to reduce the adverse effects of large valve adjustment fluctuations caused by large temperature fluctuations in the pipeline during product material production.

[0091] Optionally, when the bypass valve 307 is opened to a fixed opening according to the parameter setting, the allowable preheating temperature fluctuation adjustment range is set accordingly. The allowable preheating temperature fluctuation adjustment range is set to 3°C-8°C. If the preheating temperature fluctuation is within the allowable preheating temperature fluctuation adjustment range, the valve is not adjusted and is controlled with a fixed opening; if the preheating temperature fluctuation is greater than the allowable preheating temperature fluctuation adjustment range, the bypass valve 307 is adjusted to bypass more hot water to the second cooling pipe section 8, reducing the amount of hot water entering the first preheating pipe section 1 and the first auxiliary preheating pipe section 2, so as to improve the temperature adjustment capacity of the steam regulating valve 303, thereby achieving more accurate adjustment of the preheating temperature; if the preheating temperature fluctuation is less than the allowable preheating temperature fluctuation adjustment range, the bypass valve 307 is closed, and more hot water enters the first preheating pipe section 1 and the first auxiliary preheating pipe section 2, so as to make full use of the heat exchange effect of hot water.

[0092] It should be noted that there is no order between steps S810 and S820. Either one of them can be used in actual operation, that is, step S810 or S820 can be selected according to the specific material.

[0093] Optionally, continue to Figure 6 As shown, after step S800, the following steps are also included:

[0094] S900, when the production is finished, the material in the balance cylinder is emptied.

[0095] Specifically, when the production preparation is completed, the balance cylinder is emptied first. At this time, the preheating temperature is controlled to be reduced by 1.8℃-2.2℃, preferably 2℃ (because the heat demand is large when the product is made, once it is switched to water top material, the heat demand of water is small, so the preheating temperature of the preheating section will rise rapidly, causing the temperature of the sterilization section and the cooling section in the later section to be unstable. By slowly reducing the control temperature of the preheating temperature by 2℃, the heat supply is reduced in advance, so that the temperature does not change too quickly during water top material, which is conducive to system stability. The requirements are met by adjusting the set value of PID to decrease slowly, and the temperature reduction rate is controlled to be 0.8℃ / min-1.2℃ / min. The preferred temperature reduction rate is 1℃ / min to prevent the system from being unstable due to excessive temperature changes. For example: the temperature is reduced by 2℃ in 120 seconds.

[0096] When the equipment has been emptied and water top material has started (the balance cylinder and other materials are discharged with water), the preheating temperature is slowly controlled back to the set preheating temperature, so as to restore the temperature at each stage to the set temperature control temperature, to ensure the stability of the entire system, and to achieve the requirement by slowly increasing the set value of PID, and to control the temperature increase rate to 0.8℃ / min-1.2℃ / min, and the preferred temperature increase rate is 1℃ / min to prevent the system from being unstable due to rapid temperature changes, for example: controlling the temperature to increase by 2℃ in 120 seconds.

[0097] S1000, circulating water is introduced into the balance cylinder again to push the materials in the feed pipeline and the discharge pipeline, and when either the water pushing time or the water pushing amount reaches a set value, the material in the discharge pipeline is discharged.

[0098] S1100, after the water pushing is completed, water flushing is performed, and the pipeline is flushed according to the water flushing volume and the maximum water flushing time. After the cleaning is completed, the water circulation is entered to wait for the next production.

[0099] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0100] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0101] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific conditions. In the description of this specification, specific features, structures, materials or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steam-assisted preheating shell-and-tube heat exchange sterilization system, characterized in that: include: Feed and discharge pipes; The feed pipeline is provided with a first preheating pipe section, a first auxiliary preheating pipe section, a second heat exchange sterilization pipe section, a third heat exchange sterilization pipe section and a fourth heat exchange sterilization pipe section in sequence along the feed direction; The discharge pipeline is provided with a first cooling pipe section, a second cooling pipe section, a third cooling pipe section and a fourth cooling pipe section in sequence along the discharge direction; A homogenizer is arranged on the feed pipeline between the first auxiliary preheating pipe section and the second heat exchange sterilization pipe section, and is used to homogenize the material flowing out of the first auxiliary preheating pipe section; the homogenization temperature of the homogenizer needs to meet the preset temperature requirement; The first steam preheating module is used to preheat the first preheating pipe section and / or the first auxiliary preheating pipe section so that the temperature of the material after heat exchange from the first auxiliary preheating pipe section meets the preset temperature requirement; the first steam preheating module includes a first steam intake pipeline, a first steam heat exchanger, a hot water booster pump, a heat exchange pipe switching valve and a first water storage tank; the upper part of the first water storage tank is connected to the heat exchange circulation pipeline of the second heat exchange and sterilization pipe section through a first liquid pipeline, the bottom end of the first water storage tank is connected to the liquid inlet of the first steam heat exchanger through a second liquid pipeline, and the hot water booster pump is arranged at the second The liquid pipeline is used to transport the water in the first water storage tank to the first steam heat exchanger, the liquid outlet of the first steam heat exchanger is connected to the heat exchange circulation pipeline of the first auxiliary preheating pipe section through the third liquid pipeline, the heat exchange pipe switching valve is provided on the heat exchange circulation pipeline of the first auxiliary preheating pipe section, and the heat exchange pipe switching valve is connected to the heat exchange circulation pipeline of the first preheating pipe section through the fourth liquid pipeline, and is used to control the direct connection between the third liquid pipeline and the heat exchange circulation pipeline of the first preheating pipe section; one end of the steam intake pipeline is connected to the intake port of the first steam heat exchanger, and the other end is connected to the steam source; The first preheating pipe section is connected to the cooling pipe section of the second cooling pipe section through a fifth liquid pipeline, the cooling pipe section of the first cooling pipe section is connected to the cooling pipe section of the second cooling pipe section through a sixth liquid pipeline, and the cooling pipe section of the first cooling pipe section is connected to the heat exchange circulation pipelines of the third heat exchange sterilization pipe section and the fourth heat exchange sterilization pipe section through a seventh liquid pipeline; It also includes: a steam regulating valve and a material temperature detection component; the material temperature detection component is arranged on the feed pipeline between the first auxiliary preheating pipe section and the second heat exchange sterilization pipe section, and is used to detect the material temperature after heat exchange from the first auxiliary preheating pipe section; the steam regulating valve is arranged on the first steam intake pipeline, and the steam regulating valve is controlled in linkage with the material temperature detection component, so as to adjust the steam flow entering the first steam heat exchanger according to the material temperature after heat exchange in the first auxiliary preheating pipe section.

2. The steam-assisted preheating shell-and-tube heat exchange sterilization system according to claim 1 is characterized in that: Also includes: A second steam heat exchange sterilization module, the second steam heat exchange sterilization module comprising: a second steam intake pipeline, a second steam heat exchanger and a second water storage tank; The air inlet of the second steam heat exchanger is connected to the steam source through the second steam air inlet pipeline, the second steam heat exchanger is connected to the heat exchange circulation pipeline of the fourth heat exchange and sterilization pipe section through the eighth liquid pipeline, and the second water storage tank is connected to the heat exchange circulation pipelines of the third heat exchange and sterilization pipe section and the fourth heat exchange and sterilization pipe section through the ninth liquid pipeline, thereby communicating with the seventh liquid pipeline.

3. The steam-assisted preheating shell-and-tube heat exchange sterilization system according to claim 1 is characterized in that: Also included is a bypass valve; A bypass pipeline is arranged between the circulation pipelines of the first preheating pipeline section, and the bypass valve is arranged on the bypass pipeline. The bypass valve is electrically connected to the material temperature detection component and is used to adjust the flow rate of the bypass pipeline according to the temperature of the material flowing out of the first auxiliary preheating pipeline section.

4. The steam-assisted preheating shell-and-tube heat exchange sterilization system according to claim 2, characterized in that: Also includes: Holding tube module; One end of the retaining tube module is connected to the feed pipeline, and the other end is connected to the discharge pipeline, so as to determine the corresponding pipeline direction according to different materials, thereby realizing different sterilization time controls.

5. The steam-assisted preheating shell-and-tube heat exchange sterilization system according to claim 4, characterized in that: Also includes: Balance cylinder and third water storage tank; The balancing cylinder and the third water storage tank are both connected to the feed pipeline at the front end of the first preheating pipe section.

6. The steam-assisted preheating shell-and-tube heat exchange sterilization system according to claim 1, characterized in that: Also includes: Tower water cooling module and ice water cooling module; The tower water cooling module is connected to the cooling pipeline of the third cooling pipe section, and is used to cool the material flowing through the third cooling pipe section; The ice water cooling module is connected to the cooling pipeline of the fourth cooling pipe section and is used to cool the material flowing through the fourth cooling pipe section.

7. A steam-assisted preheating shell-and-tube heat exchange sterilization method, based on the steam-assisted preheating shell-and-tube heat exchange sterilization system according to claim 5, characterized in that: The shell-and-tube heat exchange sterilization method comprises the following steps: S100, the system starts, and the feed pipeline and discharge pipeline are cleaned and sterilized at 137℃; S200, supplying circulating water into the balancing cylinder so that the circulating water level in the balancing cylinder is maintained at more than 50% of the cylinder volume; S300, the circulating water in the balance cylinder is sequentially transported to the first preheating pipe section, the first auxiliary preheating pipe section, the second heat exchange sterilization pipe section, the third heat exchange sterilization pipe section and the fourth heat exchange sterilization pipe section, and the first steam preheating module is controlled to start so as to heat the circulating water flowing out of the fourth heat exchange sterilization pipe section to the corresponding pre-sterilization temperature; S400, the circulating water flows into the discharge pipeline after passing through the holding pipe module for a preset sterilization time, and is sequentially heat recovered through the first cooling pipe section and the second cooling pipe section; S500, water in the discharge pipeline is cooled by tower water through the third cooling pipe section and cooled by ice water through the fourth cooling pipe section, and then introduced into the balance cylinder for circulation; S600 discharges the circulating water in the balance cylinder to the remaining 15%~25% liquid level, supplies the material from the feed pipeline to the balance cylinder for material top water, thereby pushing the circulating water in the balance cylinder into the feed pipeline and discharged from the discharge outlet; S700, after the balance cylinder is emptied, the material begins to enter the balance cylinder and is discharged from the end discharge pipeline at the same time. When either the material top water time or the material top water volume reaches the set value, the material from the discharge pipeline is discharged to the target tank; S800, sterilizes the materials entering from the feed pipeline by steam heat exchange.

8. The steam-assisted preheating shell-and-tube heat exchange sterilization method according to claim 7, characterized in that: In step S800, the steam heat exchange sterilization of the material in the feed pipeline includes: S810, for the material at the first sterilization temperature, the heat exchange pipe switching valve is actuated, thereby connecting the heat exchange circulation pipelines of the first preheating pipe section and the first auxiliary preheating pipe section, so that the hot water after heat exchange in the first steam heat exchanger can be passed into the first auxiliary preheating pipe section for heat exchange, so as to meet the homogenization temperature requirement of the homogenizer; S820, for materials at the second sterilization temperature, close the steam regulating valve, the heat exchange tube switching valve does not operate, and the heat exchange circulation pipeline of the second heat exchange sterilization pipe section is directly connected to the heat exchange circulation pipeline of the first preheating pipe section through the first steam heat exchanger; wherein, the second sterilization temperature is higher than the first sterilization temperature.

9. The steam-assisted preheating shell-and-tube heat exchange sterilization method according to claim 7, characterized in that: After step S800, the method further includes: S900, when the production is finished, the materials in the balance cylinder are emptied; S1000, circulating water is introduced into the balance cylinder again to push the materials in the feed pipeline and the discharge pipeline, and when either the water pushing time or the water pushing amount reaches a set value, the materials in the discharge pipeline are discharged; S1100, after the water pushing is completed, water flushing is performed, and the pipeline is flushed according to the water flushing volume and the maximum water flushing time. After the cleaning is completed, the water circulation is entered to wait for the next production.

10. The steam-assisted preheating shell-and-tube heat exchange sterilization method according to claim 7, characterized in that: In step S600, when the product material is supplied from the feed pipeline to the balance cylinder for top watering, the preheating temperature is controlled in advance so that the preheating temperature control temperature is increased by 1.8℃-2.2℃ in advance. The requirement is met by slowly increasing the set value of PID by adjusting it, and the temperature increase rate is controlled to be 0.8℃ / min-1.2℃ / min.

11. The steam-assisted preheating shell-and-tube heat exchange sterilization method according to claim 8, characterized in that: In step S810, the preheating temperature is adjusted by controlling the opening of the steam regulating valve, the hot water flow in the preheating section is controlled by the hot water booster pump, and the bypass valve is opened for fixed opening control according to parameter settings; in step S820, the steam regulating valve is adjusted to a closed state, the preheating temperature is adjusted by the bypass valve, and the hot water flow in the preheating section is controlled by the hot water booster pump.

12. The steam-assisted preheating shell-and-tube heat exchange sterilization method according to claim 11, characterized in that: The bypass valve is opened to a fixed opening according to parameter settings and is set with the fixed opening in the water circulation simulation mode as a reference value; when the bypass valve is opened to a fixed opening according to parameter settings, an allowable preheating temperature fluctuation adjustment range is set accordingly.

13. The steam-assisted preheating shell-and-tube heat exchange sterilization method according to claim 12, characterized in that: The allowable preheating temperature fluctuation adjustment range is set to 3°C-8°C. If the preheating temperature fluctuation is within the set allowable preheating temperature fluctuation adjustment range, the bypass valve is not adjusted and is controlled with a fixed opening; If the preheating temperature fluctuation is greater than the set allowable preheating temperature fluctuation adjustment range, the bypass valve is adjusted to bypass more hot water to the second cooling pipe section; If the preheating temperature fluctuation is less than the set allowable preheating temperature fluctuation adjustment range, the bypass valve is closed, and more hot water enters the first preheating pipe section and the first auxiliary preheating pipe section.

14. The steam-assisted preheating shell-and-tube heat exchange sterilization method according to claim 9, characterized in that: When production preparation is completed, first drain the balance cylinder, control the preheating temperature to decrease by 1.8℃-2.2℃, and slowly decrease it by adjusting the set value of PID to meet the requirement, and control the temperature reduction rate to be 0.8℃ / min-1.2℃ / min; when the equipment has drained the material and started water top material, slowly control the preheating temperature back to the set preheating temperature, and slowly increase it by adjusting the set value of PID to meet the requirement, and control the temperature increase rate to be 0.8℃ / min-1.2℃ / min.

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