Tubular sterilization device for stevioside

Abstract

The utility model discloses a tubular sterilization device for stevioside, which comprises a raw material tank, a first heat exchanger, at least one pipeline type ultraviolet sterilizer, at least one tubular instantaneous sterilizer, a vacuum flash tank, a cooler and a finished product tank which are communicated with one another, the tubular instantaneous sterilizer is also communicated with a heating medium storage tank; a thermometer and a discharging valve are arranged on a discharging pipeline of the tubular instantaneous sterilizer, the discharging pipeline of the tubular instantaneous sterilizer is further communicated with the raw material tank through a circulating pipeline, a circulating valve is arranged on the circulating pipeline, and the thermometer is respectively interlocked with the discharging valve and the circulating valve. According to the device, bacteria in stevioside feed liquid can be effectively removed, the storage stability of stevioside is improved, and the device is good in sterilization effect and low in energy consumption.

Description

Technical Field

[0001] The utility model relates to the technical field of stevioside production, in particular to a tubular sterilizing device for stevioside. Background Art

[0002] Stevioside, also known as stevioside, is a glycoside extracted from the leaves of Stevia rebaudiana, a plant of the Asteraceae family. Stevia is native to Paraguay and Brazil. It has the characteristics of high sweetness and low caloric energy. Its sweetness is 200-300 times that of sucrose, and its calorific value is only 1 / 300 of that of sucrose. At present, stevioside has been widely used in the production of food, beverages, and seasonings in Asia, North America, South America, and the European Union. China is the world's largest producer of stevioside.

[0003] After stevioside is extracted, it needs to be stored in a storage tank. During the storage process, the bacteria in the stevioside will decompose part of the sugar, thereby affecting the quality of the stevioside. Therefore, how to effectively remove the bacteria in stevioside is a problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in view of the deficiencies in the prior art, a tubular sterilizing device for stevioside is provided, which can effectively remove bacteria in stevioside liquid and improve the storage stability of stevioside, and the device has not only good sterilization effect but also low energy consumption.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A tubular sterilizing device for stevia comprises a connected raw material tank, a first heat exchanger, at least one tubular ultraviolet sterilizer, at least one tubular instantaneous sterilizer, a vacuum flash tank, a cooler, and a finished product tank, wherein the gas outlet of the vacuum flash tank is connected to the first heat exchanger, and the tubular instantaneous sterilizer is also connected to a heating medium storage tank; a thermometer and a discharge valve are arranged on the discharge pipe of the tubular instantaneous sterilizer, the discharge pipe of the tubular instantaneous sterilizer is also connected to the raw material tank through a circulation pipe, the circulation pipe is provided with a circulation valve, and the thermometer is respectively interlocked with the discharge valve and the circulation valve.

[0007] Preferably, the raw material tank, the finished product tank and the heating medium storage tank are all provided with a stirrer.

[0008] Preferably, the number of the pipeline-type ultraviolet sterilizers is at least two, and at least two pipeline-type ultraviolet sterilizers are arranged in series.

[0009] Preferably, the number of the tubular instantaneous sterilizers is at least two, and at least two tubular instantaneous sterilizers are arranged in series.

[0010] Preferably, a second heat exchanger is further included, and the heating medium outlet of the tubular instantaneous sterilizer is connected to the heating medium storage tank through the second heat exchanger.

[0011] Preferably, the first heat exchanger and the second heat exchanger are both shell-and-tube heat exchangers.

[0012] Preferably, a nozzle is provided on the liquid inlet pipe of the vacuum flash tank.

[0013] Preferably, the cooler is a shell-and-tube cooler, and there are multiple shell-and-tube coolers, which are arranged in series.

[0014] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0015] The utility model provides a tubular sterilizing device for stevia, comprising a connected raw material tank, a first heat exchanger, a tubular ultraviolet sterilizer, a tubular instantaneous sterilizer, a vacuum flash tank, a cooler, and a finished product tank; the stevia liquid is preheated by the first heat exchanger, the stevia liquid is preliminarily sterilized by the tubular ultraviolet sterilizer, and then heated and sterilized by the tubular instantaneous sterilizer, the sterilized stevia liquid enters the vacuum flash tank, the flashed steam enters the first heat exchanger to preheat the stevia liquid, thereby realizing the reuse of waste heat and reducing energy consumption, and the sterile stevia obtained by cooling the flashed liquid by the cooler enters the finished product tank for storage, and the above arrangement effectively improves the storage stability of stevia.

[0016] The device has a thermometer and a discharge valve on the discharge pipe of the tubular instantaneous sterilizer. The discharge pipe of the tubular instantaneous sterilizer is also connected with the raw material tank through a circulation pipe. The circulation pipe is provided with a circulation valve. The thermometer is interlocked with the discharge valve and the circulation valve respectively. The thermometer monitors the temperature of the stevia liquid treated by the tubular instantaneous sterilizer in real time. If the liquid reaches the set temperature, the discharge valve is opened, and the stevia liquid enters the vacuum flash tank for treatment. If the temperature is lower than the set temperature, the circulation valve is opened, and the stevia liquid re-enters the raw material tank for a new round of sterilization treatment, thereby effectively improving the sterilization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0019] In the figure, 1. raw material tank; 2. first heat exchanger; 3. pipeline ultraviolet sterilizer; 4. second heat exchanger; 5. heating medium storage tank; 6. vacuum flash tank; 7. finished product tank; 8. thermometer; 9. discharge valve; 10. circulation pipeline; 11. circulation valve; 12. agitator; 13. first tubular instantaneous sterilizer; 14. second tubular instantaneous sterilizer; 15. third tubular instantaneous sterilizer; 16. fourth tubular instantaneous sterilizer; 17. nozzle; 18. first tube-in-tube cooler; 19. second tube-in-tube cooler; 20. third tube-in-tube cooler; 21. fourth tube-in-tube cooler. DETAILED DESCRIPTION

[0020] The utility model discloses a sterilizing device for stevioside, which solves the problem that stevioside liquid is easily decomposed by bacteria during storage.

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Example

[0023] like Figure 1 As shown, a tubular sterilization device for stevia comprises a connected raw material tank 1, a first heat exchanger 2, at least one tubular ultraviolet sterilizer 3, at least one tubular instantaneous sterilizer, a second heat exchanger 4, a heating medium storage tank 5, a vacuum flash tank 6, a cooler, and a finished product tank 7. A thermometer 8 and a discharge valve 9 are provided on the discharge pipe of the tubular instantaneous sterilizer. The discharge pipe of the tubular instantaneous sterilizer is also connected to the raw material tank 1 through a circulation pipe 10. A circulation valve 11 is provided on the circulation pipe 10. The thermometer 8 is interlocked with the discharge valve 9 and the circulation valve 11, respectively. The thermometer 8 can detect the temperature of the stevia liquid after being treated by the tubular instantaneous sterilizer in real time. If the temperature of the stevia liquid does not reach 80°C, the thermometer 8 transmits a signal to the external control system (not shown in the figure), and the external control system controls the opening of the circulation valve 11, and the stevia liquid re-enters the raw material tank 1 for another round of treatment. If the temperature of the stevia liquid reaches 80°C, the discharge valve 9 is opened, and the liquid enters the vacuum flash tank 6 for treatment; the above arrangement greatly improves the sterilization effect of the stevia liquid.

[0024] like Figure 1As shown, in order to reduce energy consumption, in this embodiment, the gas outlet of the vacuum flash tank 6 is connected to the first heat exchanger 2, and the gas generated during the vacuum flash process enters the first heat exchanger 2 to preheat the stevia liquid, thereby realizing the recycling of waste heat.

[0025] Furthermore, in this embodiment, a stirrer 12 is provided in the raw material tank 1 , the finished product tank 7 and the heating medium storage tank 5 .

[0026] Furthermore, in the present embodiment, the number of the pipeline-type ultraviolet sterilizers 3 is at least two, and at least two pipeline-type ultraviolet sterilizers 3 are arranged in series; further, based on the consideration of economy and sterilization effect, the number of the pipeline-type ultraviolet sterilizers 3 is preferably two.

[0027] Further, in this embodiment, the number of the tubular instantaneous sterilizers is at least two, and at least two tubular instantaneous sterilizers are arranged in series, and the heating medium outlet of the tubular instantaneous sterilizer is connected to the heating medium storage tank 5 through the second heat exchanger 4; further, based on economic efficiency and sterilization effect considerations, the number of tubular instantaneous sterilizers is preferably four, such as Figure 1 As shown, there are respectively a first tubular instantaneous sterilizer 13, a second tubular instantaneous sterilizer 14, a third tubular instantaneous sterilizer 15, and a fourth tubular instantaneous sterilizer 16 connected in series, the heating medium inlet of the first tubular instantaneous sterilizer 13 is connected to the heating medium storage tank 5, the heating medium inlet and the heating medium outlet of the second tubular instantaneous sterilizer 14 are respectively connected to the heating medium outlet of the first tubular instantaneous sterilizer 13 and the heating medium inlet of the third tubular instantaneous sterilizer 15; the heating medium inlet and the heating medium outlet of the fourth tubular instantaneous sterilizer 16 are respectively connected to the heating medium outlet of the third tubular instantaneous sterilizer 15 and the second heat exchanger 4; the above arrangement allows the heating medium to be recycled, thereby reducing energy consumption.

[0028] Furthermore, in the present embodiment, the first heat exchanger 2 and the second heat exchanger 4 are both shell-and-tube heat exchangers. When in use, the stevia liquid in the raw material tank 1 enters the shell side of the first heat exchanger 2 to exchange heat with the steam in the tube side of the first heat exchanger 2; the heating medium coming out of the tubular instantaneous sterilizer enters the shell side of the second heat exchanger 4 to exchange heat with the steam in the tube side of the second heat exchanger 4.

[0029] Furthermore, in this embodiment, a nozzle 17 is provided on the liquid inlet pipe of the vacuum flash tank 6, so that the feed liquid enters the vacuum flash tank 6 evenly, thereby improving the evaporation efficiency.

[0030] Furthermore, in this embodiment, the cooler is a shell-and-tube cooler, and the number of the shell-and-tube coolers is multiple, and the multiple shell-and-tube coolers are arranged in series; further, based on economic and cooling effect considerations, such as Figure 1 As shown, there are four shell-and-tube coolers, namely the first shell-and-tube cooler 18, the second shell-and-tube cooler 19, the third shell-and-tube cooler 20, and the fourth shell-and-tube cooler 21; during cooling, cooling water enters from the shell side of the fourth shell-and-tube cooler 21 as a cooling medium, passes through the shell side of the third shell-and-tube cooler 20, the shell side of the second shell-and-tube cooler 19 in sequence, and is finally discharged from the shell side of the first shell-and-tube cooler 18, thereby realizing multiple utilization of cooling water and reducing energy consumption.

[0031] In summary, the sterilization device provided in the present application can effectively sterilize the stevia liquid and prevent the sugar in the stevia liquid from being decomposed by bacteria during storage.

[0032] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tubular sterilizing device for stevia, characterized in that: It includes a connected raw material tank, a first heat exchanger, at least one pipeline ultraviolet sterilizer, at least one tubular instantaneous sterilizer, a vacuum flash tank, a cooler, and a finished product tank. The gas outlet of the vacuum flash tank is connected to the first heat exchanger, and the tubular instantaneous sterilizer is also connected to a heating medium storage tank; a thermometer and a discharge valve are provided on the discharge pipe of the tubular instantaneous sterilizer, and the discharge pipe of the tubular instantaneous sterilizer is also connected to the raw material tank through a circulation pipe, and a circulation valve is provided on the circulation pipe, and the thermometer is respectively interlocked with the discharge valve and the circulation valve.

2. A tubular sterilizing device for stevia according to claim 1, characterized in that: Agitators are arranged in the raw material tank, finished product tank and heating medium storage tank.

3. A tubular sterilizing device for stevia according to claim 1, characterized in that: The number of the pipeline-type ultraviolet sterilizers is at least two, and at least two pipeline-type ultraviolet sterilizers are arranged in series.

4. The tubular sterilizing device for stevia according to claim 1, characterized in that: The number of the tubular instantaneous sterilizers is at least two, and at least two tubular instantaneous sterilizers are arranged in series.

5. The tubular sterilizing device for stevia according to claim 1, characterized in that: It also includes a second heat exchanger, and the heating medium outlet of the tubular instantaneous sterilizer is connected to the heating medium storage tank through the second heat exchanger.

6. The tubular sterilizing device for stevia according to claim 1, characterized in that: The first heat exchanger and the second heat exchanger are both shell-and-tube heat exchangers.

7. The tubular sterilizing device for stevia according to claim 1, characterized in that: A spray nozzle is arranged on the liquid inlet pipe of the vacuum flash tank.

8. The tubular sterilizing device for stevia according to claim 1, characterized in that: The cooler is a shell-and-tube cooler, and there are multiple shell-and-tube coolers, which are arranged in series.

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