CN110679820A

CN110679820A - Ultra-high temperature sterilization process for particle-containing beverage

Info

Publication number: CN110679820A
Application number: CN201910892292.7A
Authority: CN
Inventors: 茅嘉惠; 杨亚军
Original assignee: Jiangsu Newamstar Packagin Machinery Co Ltd
Current assignee: Jiangsu Newamstar Packagin Machinery Co Ltd
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2020-01-14

Abstract

The invention discloses an ultrahigh-temperature sterilization process for particle-containing beverage, which comprises the following steps: (1) heating the beverage containing particles in the particle balancing tank to a sterilization temperature through a first heat exchanger and a heat preservation pipe in sequence for sterilization; (2) cooling the sterilized beverage containing particles to the filling temperature through a second heat exchanger and a cooler in sequence; (3) recovering or discharging the beverage containing particles cooled to the filling temperature after passing through a back pressure valve, and detecting whether the concentration of the beverage is qualified or not; (4) and when the concentration of the recovered or discharged beverage containing particles is qualified, closing the backpressure valve, introducing the beverage containing particles which is cooled to the filling temperature into the particle backpressure tank, continuously supplementing sterile backpressure gas into the particle backpressure tank, and maintaining the pressure in the system through the particle backpressure tank. The ultrahigh-temperature sterilization process for the granular beverage, disclosed by the invention, has the advantages that the continuous material output is kept, the taste and the quality of the granular beverage are stable, the commercial sterile level of the product can be reached, and the quality guarantee period of the product is effectively prolonged.

Description

Ultra-high temperature sterilization process for particle-containing beverage

Technical Field

The invention relates to the technical field of beverage production, in particular to an ultrahigh-temperature sterilization process for particle-containing beverages.

Background

The beverage containing the granules has higher nutritive value and unique taste and flavor, is popular in the markets of China and southeast Asia, and is widely accepted by consumers in China. However, liquid UHT-like products have not been used for sterilization of particulate beverages at home and abroad for a while. The main reason is that the system needs pressurization when being heated, the integrity of the particles cannot be damaged when the system is pressurized, and the particles are extruded and damaged when a conventional pressurization back pressure valve is selected. Therefore, many customers can only select the autoclave to perform pressure cooking in a single batch with one pot, but the sterilization capability of the autoclave is low, the sterilization amount of each batch is limited, continuous supply cannot be realized, and the tank changing and feeding are needed in midway. Meanwhile, the central temperature of the heated pot does not reach the standard, so that the sterilization is not thorough, the surface of the pot wall is easy to scale and scorch, the cleaning is difficult, and the maintenance cost is high. Secondly, the customer needs to pass through manual operation when adjusting the product every time, and the operating efficiency is low and the maloperation risk is big.

The granular beverage currently on the market includes coconut milk beverage containing coconut, fruit juice containing strawberry granules, fruit juice containing yellow peach pulp, fruit juice containing aloe granules, grain beverage containing grain granules, and the like. The products are treated by a pasteurization machine with the sterilization temperature of 85 ℃, the sterilization temperature is low, pressurization and heating sterilization are not needed, although a plurality of pathogenic bacteria nutriments can be killed in the pasteurization process, the shelf life of the products can be influenced by some heat-resistant spores which can not be killed by pasteurization. In order to ensure that the product can be stored at ambient temperature for a longer period of time, higher temperature sterilization of the product is required, requiring an ever increasing internal pressure.

However, the internal structures of various conventional back pressure valves easily cause extrusion damage to particles in the feed liquid, the integrity of the particles is damaged, and the sensory loss of the final product is caused.

Disclosure of Invention

The invention aims to provide an ultrahigh-temperature sterilization process for particle-containing beverages, which is characterized in that a particle backpressure tank is arranged at an outlet, sterile backpressure gas is continuously supplemented into the particle backpressure tank, and the pressure in a system is maintained through the particle backpressure tank, so that the original sterilization temperature can be maintained in a high-temperature section; the system keeps continuous material output, so that the taste and the quality of the beverage containing the particles are stable, the physical, chemical and sensory changes of the product are reduced to the maximum extent, the product can reach the commercial sterile level, the product can be stored, transported and sold under the non-refrigeration condition, and the quality guarantee period of the product is effectively prolonged.

In order to achieve the purpose, the invention adopts the technical scheme that:

an ultra-high temperature sterilization process for a particle-containing beverage, comprising the steps of:

(1) heating the beverage containing particles in the particle balancing tank to a sterilization temperature through a first heat exchanger and a heat preservation pipe in sequence for sterilization;

(2) cooling the sterilized beverage containing particles to the filling temperature through a second heat exchanger and a cooler in sequence;

(3) recovering or discharging the beverage containing particles cooled to the filling temperature after passing through a back pressure valve, and detecting whether the concentration of the beverage is qualified or not;

(4) and when the concentration of the recovered or discharged beverage containing particles is qualified, closing the backpressure valve, introducing the beverage containing particles which is cooled to the filling temperature into the particle backpressure tank, continuously supplementing sterile backpressure gas into the particle backpressure tank, and maintaining the pressure in the system through the particle backpressure tank.

Preferably, before the step (1), the RO water is introduced into the particle balance tank, and then flows back to the particle balance tank after sequentially passing through the first heat exchanger, the heat preservation pipe, the second heat exchanger, the cooler and the back pressure valve.

More preferably, before the step (1), introducing high-temperature steam into the particle backpressure tank, enabling the high-temperature steam to enter a feeding pipeline and a discharging pipeline which are communicated with the particle backpressure tank respectively, closing a discharging control valve between the backpressure valve and the feeding pipeline to cut off the RO water and the high-temperature steam, and discharging condensed water after sterilization is finished.

Preferably, in step (4), the first line for recovering or discharging the beverage containing particles is subjected to CIP cleaning after closing the back pressure valve.

Preferably, a heat exchange medium is circulated through the first heat exchanger and the second heat exchanger, and the heat exchange medium before entering the first heat exchanger is heated by steam.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the invention relates to an ultrahigh temperature sterilization process for particle-containing beverages, which is characterized in that a particle backpressure tank is arranged at an outlet, sterile backpressure gas is continuously supplemented into the particle backpressure tank, and the pressure in a system is maintained through the particle backpressure tank, so that the original sterilization temperature can be maintained in a high temperature section; the system keeps continuous material output, so that the taste and the quality of the beverage containing the particles are stable, the physical, chemical and sensory changes of the product are reduced to the maximum extent, the product can reach the commercial sterile level, the product can be stored, transported and sold under the non-refrigeration condition, and the quality guarantee period of the product is effectively prolonged.

Drawings

FIG. 1 is a schematic structural diagram of an ultra-high temperature sterilization production line for granular beverage applying the process of the invention.

Wherein: 1. a feed stop valve; 2. a feed valve; 3. an evacuation valve; 4. a particle balancing tank; 5. a delivery pump; 6. a flow meter; 7. a first heat exchanger; 8. a sterilization temperature detector; 9. a steam proportion regulating valve; 10. a heat preservation pipe; 11. a hot water heat exchange system; 12. a second heat exchanger; 13. a cooler; 14. a back pressure valve; 15. a backflow stop valve; 16. a CIP liquid inlet valve; 17. a discharge control valve; 18. a steam trap; 19. a particle backpressure tank; 20. an SIP steam inlet valve; 21. a sterile back pressure gas inlet valve; 22. a backflow drain valve; 23. a feed line; 24. a discharge pipeline; 25. a first conduit.

A. The front adjusting tank contains granular beverage; B. refluxing CIP; C. feeding CIP liquid; D. a high temperature steam inlet; E. a sterile back pressure gas inlet; F. a product outlet; G. RO water enters; H. steam is fed; I. feeding cooling liquid; J. and (6) discharging the cooling liquid.

Detailed Description

The technical scheme of the invention is further explained by combining the attached drawings.

The process is used for treating the material with the concentration less than or equal to 60 percent, namely the content of pulp particles in 100g of material is not more than 60g, and the material is prepared by mixing the pulp particles with the specification less than or equal to 5 multiplied by 5mm and the feed liquid according to the proportion.

In order to ensure that the temperature of a sterilization section can be raised to be above 100 ℃ for sterilization, specific pressure must be given to the inside of the system, the feed liquid can only raise the temperature to be 100 ℃ at most under normal pressure environment, partial heat-resistant microorganisms and spores cannot be completely killed, and the conventional UHT system realizes system pressurization to be above 2bar through various types of back pressure valves so as to effectively raise the temperature of the material to be 135 ℃ or even higher, and the ultrahigh temperature instant sterilization is carried out by keeping the sterilization time to be not less than 1s at the temperature.

Referring to FIG. 1:

first, the UHT system is SIP sterilized:

SIP heat treatment sterilization is carried out on all pipelines in contact with the materials, so that the materials processed in the later period are prevented from being infected with bacteria, and the interior of the UHT system can be sterilized by hot water or superheated water. Supplement the RO water to 4 granule balance tanks through the RO water pipeline, detect the flow through flowmeter 6, the 5 frequency of real-time feedback adjustment delivery pump, accurate control output flow. Then, the RO water enters the first heat exchanger 7, the temperature condition of the outlet RO water is detected in real time and the opening of the steam proportion adjusting valve 9 is fed back and adjusted through the sterilization temperature detector 8 at the outlet position of the heat exchanger, and the temperature of a heat exchange medium (in the embodiment, the heat exchange medium is hot water) entering the first heat exchanger 7 of the hot water heat exchange system 11 is corrected. And (3) heating the temperature of the RO water in the UHT system to be higher than the required temperature of 100 ℃ for hot water sterilization or higher than 140 ℃ for superheated water, then sterilizing the RO water in a heat-insulating pipe 10 at the rear end, sterilizing the RO water in a second heat exchanger 12 after passing through the heat-insulating pipe, and immediately cooling the RO water in a cooler 13. And then passes through the discharge control valve 17 again, the discharge control valve 17 is in the closed state, go up the valve pocket and do not communicate with each other with lower valve pocket, high temperature RO water passes through the discharge control valve 17 and goes up the valve pocket after, flow into the backflow stop valve 15 again, backflow stop valve 15 is in the open mode, go up the valve pocket and communicate with each other with lower valve pocket, whole valve pocket is filled up to high temperature RO water, CIP feed liquor valve 16 is in the closed state this moment, high temperature RO water can only continue to flow toward back pressure valve 14, this back pressure valve 14 has played the effect of pressurizeing for the system, the system only under the condition of area pressure, the section of disinfecting temperature that disinfects can rise to more than 100. High-temperature RO water flows back to the backflow discharge valve 22 after passing through the backpressure valve 14, the backflow discharge valve 22 is in a closed state, the high-temperature RO water flows into the upper valve cavity through the lower valve cavity and flows out, then passes through the feeding valve 2, the feeding valve 2 is in a closed state, the upper valve cavity and the lower valve cavity are not communicated with each other, the high-temperature RO water flows back to the particle balance tank 4 and continues to be repeatedly and circularly supplied to the conveying pump 5 for output, and the circulating sterilization work of the whole UHT system pipeline is maintained for more than 30 minutes.

The particle back pressure tank 19 and the feeding pipeline 23 and the discharging pipeline 24 communicated with the same are subjected to SIP heat treatment sterilization. High-temperature steam enters the particle backpressure tank 19 through the SIP steam inlet valve 20, the SIP steam inlet valve 20 is in an open state, the upper valve cavity and the lower valve cavity are communicated, the high-temperature steam enters the feeding pipeline 23 (located between the particle backpressure tank 19 and the discharging control valve 17) and the discharging pipeline 24, the particle backpressure tank 19, the feeding pipeline 23 and the discharging pipe are maintained for high-temperature steam sterilization for more than 30 minutes, and condensed water is discharged through the steam trap 18.

Second, UHT systems produce normally:

the material that the preceding transfer jar contains granule beverage and advances A transport empties the inside residual water of material pipeline through blowoff valve 3, and the residual material of low concentration is opened through feeding stop valve 1 and is flowed back and continue to allocate in the preceding transfer jar. After the product concentration and the particle content are qualified (material top water), the feeding stop valve 1 is closed, the particle-containing materials can only enter through the lower valve cavity of the feeding valve 2, the feeding valve 2 is in an open state, the upper valve cavity and the lower valve cavity are mutually communicated, and the particle-containing materials enter the particle balancing tank 4 for buffering and are used for providing stable flow for the rear end of the UHT system. The flow of the particle-containing materials is detected through the flow meter 6, the frequency of the delivery pump 5 is fed back and adjusted in real time, and the output flow is controlled accurately. Then the water enters a first heat exchanger 7 to be heated, the temperature condition of the buccal particle materials is detected in real time by a sterilization temperature detector 8 at the outlet position of the heat exchanger, the opening degree of a steam proportion adjusting valve 9 is fed back and adjusted, and the temperature of heat exchange media (hot water) entering the first heat exchanger 7 of a hot water heat exchange system 11 is corrected. Heating the particle-containing material in the UHT system to 135 ℃ required by sterilization, then entering a heat-insulating pipe 10 at the rear end, keeping ultrahigh-temperature instantaneous sterilization for not less than 1s, entering a second heat exchanger 12 after passing, pre-cooling by using refluxing low-temperature hot water, and then entering a cooler 13 to cool to the filling temperature. And then the particle-containing material flows into the backflow stop valve 15 after passing through the upper valve cavity of the discharge control valve 17, the backflow stop valve 15 is in an open state, the upper valve cavity is communicated with the lower valve cavity, the particle-containing material fills the whole valve cavity, and the CIP liquid inlet valve 16 is in a closed state, flows towards the back pressure valve 14 and pressurizes the system through the back pressure valve 14. Part of the material containing particles passes through the backpressure valve 14 and is damaged by extrusion, the material containing particles after passing through the backpressure valve 14 flows into the backflow discharge valve 22 through the first pipeline 25, the backflow discharge valve 22 is in an open state, and the material containing particles is directly discharged. Whether the material index is qualified or not is detected through the discharge port, after the material index is qualified through manual confirmation (material top water), the discharge control valve 17 is opened, the discharge control valve 17 is in an open state, the upper valve cavity and the lower valve cavity are communicated with each other, and meanwhile, the backflow stop valve 15 is closed, so that the material containing particles is directly and completely sent into the particle backpressure tank 19 without passing through the backpressure valve 14. At this time, the particle backpressure tank 19 continuously supplements the sterile backpressure gas through the sterile backpressure gas inlet valve 21, and maintains the pressurization pressure required by the UHT system so as to maintain the stability of the temperature rise of the UHT system. The particle-containing material is conveyed by the back pressure of the particle back pressure tank 19 to provide a stable filling flow for the back end filling equipment.

Meanwhile, the CIP liquid inlet valve 16 is opened, the CIP liquid enters, passes through the valve cavity on the backflow stop valve 15, enters the backpressure valve 14, passes through the backflow discharge valve 22, is continuously discharged in an open state, and cleans the valve through which the materials just flow and the first pipeline 25.

In the pellet backpressure tank 19, sterile backpressure gas enters the pellet backpressure tank 19 from above, while particulate-containing material enters the pellet backpressure tank 19 from below.

The above-mentioned embodiments are merely illustrative of the technical idea and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.

Claims

1. An ultra-high temperature sterilization process for a particle-containing beverage, characterized in that: the method comprises the following steps:

2. Ultra-high temperature sterilization process for beverage containing particles according to claim 1, characterized in that: before the step (1), introducing RO water into the particle balance tank, and enabling the RO water to flow back into the particle balance tank after sequentially passing through the first heat exchanger, the heat preservation pipe, the second heat exchanger, the cooler and the back pressure valve.

3. Ultra-high temperature sterilization process for beverage containing particles according to claim 2, characterized in that: before the step (1), introducing high-temperature steam into the particle backpressure tank, enabling the high-temperature steam to enter a feeding pipeline and a discharging pipeline which are communicated with the particle backpressure tank respectively, closing a discharging control valve between the backpressure valve and the feeding pipeline to cut off the RO water and the high-temperature steam, and discharging condensed water after sterilization is finished.

4. Ultra-high temperature sterilization process for beverage containing particles according to claim 1, characterized in that: in step (4), after closing the back pressure valve, CIP cleaning is performed on the first line for recovering or discharging the beverage containing particles.

5. Ultra-high temperature sterilization process for beverage containing particles according to claim 1, characterized in that: circulating a heat exchange medium through the first heat exchanger and the second heat exchanger and heating the heat exchange medium by steam prior to entering the first heat exchanger.