CN210275731U - Ultraviolet sterilization equipment for liquid beverage - Google Patents
Ultraviolet sterilization equipment for liquid beverage Download PDFInfo
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- CN210275731U CN210275731U CN201921038434.5U CN201921038434U CN210275731U CN 210275731 U CN210275731 U CN 210275731U CN 201921038434 U CN201921038434 U CN 201921038434U CN 210275731 U CN210275731 U CN 210275731U
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Abstract
The ultraviolet sterilization equipment for the liquid beverage comprises N tubes and a support, wherein N is more than or equal to 2, and the tubes are fixed on the support in parallel; each tube array comprises an ultraviolet lamp tube at the innermost layer, a quartz tube at the middle layer and a conveying tube at the outermost layer, a feeding hole and a discharging hole are formed in the conveying tube, the feeding hole of the first tube array is connected with a feeding tube, the discharging hole of the Nth tube array is connected with a discharging tube, and the discharging holes of the other tube arrays are connected with the feeding holes of the adjacent tube arrays through pipelines. The utility model discloses an ultraviolet dose that equipment adopted is low, bactericidal effect is good, fine the flavor and the nutrition that have kept liquid beverage.
Description
Technical Field
The utility model relates to a liquid beverage field of disinfecting, in particular to adopt ultraviolet ray to disinfect equipment of liquid beverage.
Background
An indispensable process in the production process of liquid beverages is a heat sterilization process. The liquid beverage can kill or partially kill microorganisms and destroy enzyme substances in the liquid beverage through heat sterilization, so as to achieve the purposes of eating safety and prolonging the shelf life of the product. However, heat sterilization achieves this goal while affecting the nutritional ingredients, flavor, texture, etc. to varying degrees.
The ultraviolet sterilization technology is widely applied to sterilization and disinfection of drinking water and has good effect. However, due to the low penetration of ultraviolet light, there are certain requirements for the chromaticity, turbidity, etc. of the liquid to be sterilized, which limits its range of application. When ultraviolet light is used as a sterilization means for liquid foods such as apple juice, orange juice, milk and the like, the sterilization effect can be ensured only by ensuring that the ultraviolet light can penetrate through the foods. However, most of the existing ultraviolet sterilization devices are designed for sterilizing drinking water, and cannot be applied to sterilization of liquid beverages such as apple juice, orange juice, milk and the like.
There are two ways to achieve good penetration of the ultraviolet light through the liquid beverage. One method is to form a liquid beverage into an extremely thin liquid film to increase the ultraviolet transmittance; another method is to increase the surface renewal speed of the liquid beverage near the light source, for example, the liquid beverage passes through the light source in a turbulent flow state, the liquid beverage can flow in a spiral tube at a certain speed to form Dean vortex, and an ultraviolet lamp is arranged outside the spiral tube, so that the ultraviolet radiation intensity and the radiation uniformity can be increased. By adopting the two methods separately, a plurality of technical problems are encountered in the practical application process. If the first method is used to form a liquid beverage into an extremely thin film, not only the production capacity of the ultraviolet sterilization equipment is greatly limited, but also the manufacturing precision of the equipment is highly required, and the production cost of the equipment is high. However, the second method requires a spiral quartz tube, which is difficult to manufacture.
SUMMERY OF THE UTILITY MODEL
The utility model provides an ultraviolet sterilization equipment suitable for liquid beverage disinfects according to the not enough of current ultraviolet sterilization equipment existence, and this equipment has that the bactericidal effect is good, the energy consumption is low advantage, is applicable to sterilizing of liquid beverage.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the ultraviolet sterilization equipment for the liquid beverage comprises N tubes and a support, wherein N is more than or equal to 2, and the tubes are fixed on the support in parallel; each tube array comprises an ultraviolet lamp tube at the innermost layer, a quartz tube at the middle layer and a conveying tube at the outermost layer, a feeding hole and a discharging hole are formed in the conveying tube, the feeding hole of the first tube array is connected with a feeding tube, the discharging hole of the Nth tube array is connected with a discharging tube, and the discharging holes of the other tube arrays are connected with the feeding holes of the adjacent tube arrays through pipelines.
In some embodiments, the delivery tube is a bellows.
In some embodiments, the feed inlets of the first array of tubes are connected to a variable frequency pump.
In some embodiments, a static mixer is provided in the conduit connecting adjacent tube arrays.
In some embodiments, a seal ring is mounted in a gap between the quartz tube and the two ends of the conveying pipe.
In some embodiments, the feed inlet of the first tube column and the discharge outlet of the Nth tube column are provided with temperature sensors.
In some embodiments, one end of the tube array is provided with an ultraviolet illuminometer, and the other end is provided with a cooling device.
In some embodiments, the cooling device is a fan.
In some embodiments, a temperature sensor is installed at the gap between the quartz tube and the ultraviolet lamp tube.
In some embodiments, the cooling device is connected with a control box, and the opening and closing of the cooling device are controlled by the control box.
In some embodiments, the control box comprises a plurality of control switches for independently controlling the on and off of each ultraviolet lamp tube.
Compared with the prior art, the utility model discloses following beneficial effect has:
at present, ultraviolet light of the existing ultraviolet sterilization equipment cannot penetrate liquid beverages such as apple juice, orange juice, milk and the like, the sterilization effect is poor, and liquid foods after sterilization have obvious peculiar smell. The utility model discloses an ultraviolet dose that equipment adopted is low, the bactericidal effect is good, fine flavor and the nutrition that has kept liquid beverage, is a practical liquid beverage ultraviolet sterilization system.
Drawings
FIG. 1 is a schematic structural view of a single tube array of an ultraviolet sterilization apparatus according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a single tube array of the ultraviolet sterilization apparatus according to the embodiment of the present invention;
FIG. 3 is a cross-sectional view of an ultraviolet sterilization apparatus according to an embodiment of the present invention;
FIG. 4 shows the results of pasteurization with UV combined sterilization and pasteurization at 8 ℃ in the embodiment of the present invention;
wherein, the solid line is the standard limit value of 10 ten thousand CFU/mL of the total number of the bacterial colonies, and the dotted line is the standard limit value of 5 ten thousand CFU/mL of the total number of the bacterial colonies;
FIG. 5 shows the results of pasteurization with UV combined sterilization and pasteurization at 4 ℃ in the embodiment of the present invention;
the solid line represents a standard limit of 10 ten thousand CFU/mL for the total number of colonies, and the broken line represents a standard limit of 5 ten thousand CFU/mL for the total number of colonies.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1-2, the ultraviolet sterilization apparatus in the embodiment of the present invention is a tube array apparatus, the ultraviolet sterilization apparatus includes a plurality of tubes 10, for example, 2 to 100, 10 to 80, 20 to 60, or 35 to 50 tubes, and each tube may have a length of 0.5 to 2m, for example, 1 m; each tube array is composed of 3 concentric circular sleeves, wherein the thin circular tube 6 is an ultraviolet lamp tube, the second-thicker circular tube 1 is a quartz tube, and the thickest circular tube 2 is a food-grade stainless steel tube.
Each ultraviolet lamp tube 6 can be an electrode-containing ultraviolet lamp or an electrodeless ultraviolet lamp, and the power is 10-100W, for example 30-50W; preferably, the ultraviolet lamp tube is a microwave electrodeless ultraviolet lamp, and the power of each lamp is 20-50W, such as 30W.
The quartz tube 1 is a thick-wall quartz tube and can bear certain pressure, so that the quartz tube is not cracked in the flowing process of the feed liquid; the quartz tube 1 has an outer diameter of 80-120 mm, for example 100mm, and a length of 1 m.
The stainless steel pipe 2 is a corrugated pipe, so that the feed liquid to be sterilized keeps a turbulent flow state when flowing, and ultraviolet rays can better penetrate through the feed liquid to be sterilized; the distance between the trough at the deepest part of the corrugation of the stainless steel pipe 2 and the center of the stainless steel pipe is 51.5-52 mm, for example 51.8mm, and the distance between the wave crest at the highest part of the corrugation and the center of the stainless steel pipe is 50.8-51 mm and 50.9 mm; the maximum width of a gap between the quartz tube 1 and the stainless steel tube 2 is 1.5-2 mm, such as 1.8mm, and the minimum width is 0.8-1 mm, such as 0.9mm, and the feed liquid to be sterilized flows in the gap in a turbulent flow mode during sterilization; and rubber sealing rings 3 are arranged between the two end pipes of the quartz pipe 1 and the stainless steel pipe 2, so that the feed liquid to be sterilized is prevented from leaking.
An inlet 4 and an outlet 5 for the feed liquid to be sterilized are arranged at the two ends of each array tube in the tangential direction of the stainless steel tube; the feed liquid inlet 4 of the first tube array to be sterilized is connected with a variable frequency pump, and the flow rate of the variable frequency pump can be adjusted as required and is used for providing feed liquid to be sterilized for the ultraviolet sterilization equipment; the flow regulating range of the variable frequency pump is 2-15 t/h, such as 3.6 t/h-10.8 t/h, so that the flowing state of the material liquid to be sterilized in the sterilization equipment is guaranteed to be turbulent.
The liquid outlet 5 of the first tube array to be sterilized is connected with the liquid inlet 4 of the second tube array to be sterilized by a stainless steel tube, the liquid outlet 5 of the second tube array to be sterilized is connected with the liquid inlet 4 of the third tube array to be sterilized by a stainless steel tube, and so on.
A static mixer is arranged in the stainless pipe connecting the two tubes to ensure that the feed liquid to be sterilized is fully mixed; and a feed liquid inlet 4 of the first tube array to be sterilized and a feed liquid outlet 5 of the last tube array to be sterilized are provided with sanitary temperature probes for detecting the temperature of the milk.
As shown in FIG. 3, the tubes are fixed on the stainless steel frame 20 to form a whole set of ultraviolet sterilization equipment, so that the floor area of the equipment can be saved to the maximum extent.
An ultraviolet illuminometer is arranged at one end of each tube array and used for detecting the intensity of ultraviolet light; the other end of each tube array is provided with a cooling device (an electric fan) for reducing the operation temperature of the equipment; the cooling device is connected with the equipment control box, and the control box controls the opening and closing of the cooling device.
A temperature detection probe is arranged at a gap between the quartz tube and the ultraviolet lamp and used for detecting the running temperature of equipment, when the running temperature is higher than a certain set value, the control box controls the cooling device to be opened, and when the running temperature is lower than the certain set value, the control box controls the cooling device to be closed.
The control box is provided with 35-50 control switches, and each ultraviolet generating device can be independently controlled to be turned on and off without mutual influence.
The sterilization parameters of the ultraviolet sterilization equipment are expressed by ultraviolet dose J/L, the ultraviolet dose range of the ultraviolet sterilization equipment is 10-1500J/L, and proper ultraviolet dose can be selected according to different feed liquid to be sterilized.
The ultraviolet dosage of the ultraviolet sterilization equipment has the following relations with the power of an ultraviolet lamp and the flow velocity of the feed liquid to be sterilized: the ultraviolet dose is the total energy output by the ultraviolet lamp/the volume of the feed liquid to be sterilized is (the power of the ultraviolet lamp is multiplied by the running time)/(the flow of the feed liquid to be sterilized is multiplied by the running time) is multiplied by the power of the ultraviolet lamp/the flow of the feed liquid to be sterilized.
The following description will be made of an embodiment of the present invention, taking milk as an example:
the following process may be used for pasteurized milk: the raw milk is subjected to acceptance, filtration, purification and standardization and then enters a homogenizer for homogenization treatment. Because the homogenizing effect of the cow milk can influence the penetrating effect of ultraviolet rays in the subsequent process, the homogenizing pressure adopted in the process is 200-250 bar (the secondary pressure is adjusted to 50bar, and then the primary pressure is adjusted to 200-250 bar). And (3) the homogenized milk enters a pasteurization machine, and conventional pasteurization parameters are adopted for pasteurization at 72-85 ℃ for 15s, so that the sterilization effect is ensured. The pasteurized milk enters an ultraviolet sterilization device, and the flow rate of the milk in the ultraviolet sterilization device can be adjusted. And cooling the milk subjected to ultraviolet sterilization treatment, filling the cooled milk into filling equipment, and refrigerating and storing the cooled milk.
The following process can be used for raw milk: the raw milk is filtered and then directly enters the ultraviolet sterilization equipment, and the flow rate of the milk in the ultraviolet sterilization equipment can be adjusted. The total number of microorganisms in the milk subjected to ultraviolet sterilization treatment is remarkably reduced, and the milk is cooled and stored in a factory to be subjected to the next process.
The ultraviolet sterilization equipment is cleaned by in-situ Cleaning (CIP) after each production is finished, so that the surface of the equipment contacting with the feed liquid to be sterilized is ensured to have no milk scale; the ultraviolet sterilization equipment adopts hot water to sterilize before production starts each time, and the surface of the equipment contacting with the feed liquid to be sterilized is ensured to have no microorganism.
The ultraviolet sterilization equipment can be used for sterilizing milk, orange juice, apple juice, beer and other fluid food with certain turbidity.
In one embodiment of the present invention, after raw milk is collected from the pasture, the raw milk enters the raw milk tank, and the raw milk tank is opened to stir and cool, so that the milk in the raw milk tank is kept below 6 ℃. The raw milk in the raw milk tank is heated to 55 ℃ by a hot plate and then enters a milk purifier (separator) with the rotating speed of 7500r/min, and the process aims at separating fat from the milk, and simultaneously separating impurities in the milk and discharging slag. After milk is purified, the milk is standardized, and the fat content in the milk can meet the requirement by adding cream or skim milk. After standardization, the milk was passed through a homogenizer at a pressure of 50/250bar and a homogenization temperature of 55 ℃. Homogenizing, introducing into a pasteurization machine, pasteurizing at 75 deg.C for 15s, cooling sterilized milk to 6 deg.C, regulating milk flow rate by a variable frequency pump to 3600L/h, introducing into ultraviolet sterilization equipment via inlet 4, starting 50 ultraviolet lamps (each ultraviolet lamp has a power of 30W, and total ultraviolet dose is 1500J/L), allowing sterilized milk to flow out of the ultraviolet sterilization equipment via outlet 5, immediately cooling to 6 deg.C (the milk temperature will slightly rise during sterilization), and introducing into subsequent processes.
EXAMPLE 1 milk Sterilization
The results of the total number of colonies (log) at 8 ℃ and 4 ℃ for different times of storage of pasteurized + uv combined with pasteurized samples are shown in fig. 4 and 5:
it can be seen that: 1) under the condition of 8 ℃, the difference between the total number of the colonies of the pasteurized milk and the pasteurized milk is gradually increased along with the increase of time, the total number of the colonies of the pasteurized milk sample exceeds the national standard 10 ten thousand CFU/mL limit value of the pasteurized milk on the sixth day, the pasteurized and ultraviolet combined sterilized milk sample still does not exceed the 5 ten thousand CFU/mL limit value, and the pasteurized and ultraviolet combined sterilized milk has the shelf life prolonged by 2-3 days on the basis of 5 days in terms of the total number of the colonies.
2) Under the condition of 4 ℃, the total number of colonies of the pasteurized sample approaches the national standard 10 ten thousand CFU/mL limit value of pasteurized milk at the 20 th day, the total number of colonies of the pasteurized and ultraviolet combined pasteurized sample reaches the 10 ten thousand CFU/mL limit value about the 24 th day, and the shelf life of the pasteurized milk is prolonged by the pasteurized and ultraviolet combined pasteurizing for 3-4 days in terms of the total number of the colonies.
Example 2 Effect of UV Sterilization on the physicochemical indices of milk
The following indexes of the pasteurized milk sample with single pasteurizing, pasteurizing and ultraviolet of 3000J/L, pasteurizing and ultraviolet of 1500J/L, ultraviolet of 1500J/L and pasteurizing and ultraviolet of 1500J/L are detected, and the results are as follows:
TABLE 1 results of conventional physicochemical index measurements
TABLE 2 fatty acid index test results
The results of physical and chemical tests show that the ultraviolet sterilization treatment of the pasteurized milk does not affect the physical and chemical properties of the milk, and the indexes of protein, lactose, fat, vitamin B2, vitamin C and the like do not change obviously.
Example 3 Effect of UV Sterilization on milk safety index
After the milk is subjected to ultraviolet treatment, the risk indexes of the milk, such as the content of 5-hydroxymethylfurfural, lactulose, furoic acid, β lactoglobulin and the like, are not obviously changed.
TABLE 3 detection results of potentially risky components
| Detecting items | Pasteurized milk | Babbitt + ultra violet 3000J/L | Babbitt + UV 1500J/L |
| 5-hydroxymethylfurfural (mg/kg) | 0.185 | 0.155 | 0.15 |
| Lactulose (mg/100g) | Not detected out | Not detected out | Not detected out |
| Furfurin (mg/100g protein) | 8.5 | 8.5 | 8.5 |
| β lactoglobulin (%) | 0.302 | 0.303 | 0.301 |
| Peculiar smell | Is normal | Has peculiar smell | Is normal |
The ultraviolet treatment has no obvious influence on the risk indexes, and proves that the ultraviolet treatment belongs to complete non-heat treatment and does not increase the content of byproducts of the heat treatment. When the ultraviolet dose is more than 3000J/L, obvious peculiar smell can be generated, and the peculiar smell still exists in 5 days of refrigeration.
The inventors found through many experiments that a good sterilization effect can be obtained by using the uv dose, the fluid flow rate, and the number of uv lamps shown in table 4.
TABLE 4 ultraviolet dose, fluid flow rate, and ultraviolet lamp number relationship table
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The ultraviolet sterilization equipment for the liquid beverage is characterized by comprising N tubes and a support, wherein N is more than or equal to 2, and the tubes are fixed on the support in parallel; each tube array comprises an ultraviolet lamp tube at the innermost layer, a quartz tube at the middle layer and a conveying tube at the outermost layer, a feeding hole and a discharging hole are formed in the conveying tube, the feeding hole of the first tube array is connected with a feeding tube, the discharging hole of the Nth tube array is connected with a discharging tube, and the discharging holes of the other tube arrays are connected with the feeding holes of the adjacent tube arrays through pipelines.
2. The ultraviolet sterilization apparatus as set forth in claim 1, wherein the delivery pipe is a bellows.
3. The ultraviolet sterilization device according to claim 1, wherein the feed inlet of the first tube array is connected with a variable frequency pump, and a static mixer is arranged in a pipeline connecting the adjacent tube arrays.
4. The ultraviolet sterilization apparatus as set forth in claim 1, wherein a packing is installed in a gap between the quartz tube and both ends of the feed pipe.
5. The ultraviolet sterilization device according to claim 1, wherein the inlet of the first tube array and the outlet of the Nth tube array are provided with temperature sensors.
6. The ultraviolet sterilization apparatus as set forth in claim 1, wherein one end of the tube is mounted with an ultraviolet illuminometer, and the other end is mounted with a cooling device.
7. The ultraviolet sterilization apparatus as recited in claim 6, wherein the cooling means is a fan.
8. The ultraviolet sterilization apparatus as recited in claim 1, wherein a temperature sensor is installed at a gap between said quartz tube and said ultraviolet lamp tube.
9. The ultraviolet sterilization apparatus according to claim 6 or 7, wherein the cooling device is connected to a control box, and the cooling device is controlled to be opened and closed by the control box.
10. The ultraviolet sterilization apparatus as recited in claim 9, wherein said control box comprises a plurality of control switches for independently controlling the turning on and off of each ultraviolet lamp tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921038434.5U CN210275731U (en) | 2019-07-04 | 2019-07-04 | Ultraviolet sterilization equipment for liquid beverage |
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|---|---|---|---|
| CN201921038434.5U CN210275731U (en) | 2019-07-04 | 2019-07-04 | Ultraviolet sterilization equipment for liquid beverage |
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| CN210275731U true CN210275731U (en) | 2020-04-10 |
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| CN201921038434.5U Active CN210275731U (en) | 2019-07-04 | 2019-07-04 | Ultraviolet sterilization equipment for liquid beverage |
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