CN111248393B - Fluid food synergistic sterilization device and method - Google Patents
Fluid food synergistic sterilization device and method Download PDFInfo
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- CN111248393B CN111248393B CN202010126224.2A CN202010126224A CN111248393B CN 111248393 B CN111248393 B CN 111248393B CN 202010126224 A CN202010126224 A CN 202010126224A CN 111248393 B CN111248393 B CN 111248393B
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- A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
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- A23C3/00—Preservation of milk or milk preparations
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
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- A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
Abstract
The device is characterized in that a barrier dielectric layer is made of an insulating dielectric material, a gold immersion layer is deposited on the upper surface of the barrier dielectric layer, and a first electrode hole is formed in the gold immersion layer; the immersion gold grid layer PCB is printed on the lower surface of the barrier dielectric layer, the immersion gold grid layer for generating uniform plasma is provided with a second electrode hole, the immersion gold grid layer is provided with a rhombic grid, the cooling device is arranged above the surface dielectric barrier discharge structure, and the cooling device faces and cools the immersion gold layer; the transfer groove is arranged below the surface dielectric barrier discharge structure to transfer the fluid food facing the gold immersion grid layer, so that the downward-diffused surface plasma acts on the fluid food, an annular gap is formed between the outer wall and the high-voltage end, the fluid food from the transfer groove is controllably led into the annular gap by the first buffer tank, the fluid food is controllably led out of the annular gap by the second buffer tank by the flow rate, and the annular gap is sealed by the first buffer tank and the second buffer tank.
Description
Technical Field
The invention relates to the technical field of non-thermal sterilization and preservation of fluid food, in particular to a fluid food synergistic sterilization device and a fluid food synergistic sterilization method.
Background
As the first major food industry country in the world, the food industry has become the most active 'new growth point' of national economy in China and 'new space' for developing modern agriculture. The beverage occupies half a day of the food industry, and the quality, nutrition and quality safety of every one of thousands of households are also a supporting industry for pulling internal demand, guaranteeing the livelihood, promoting economic growth, converting agricultural products in large quantities and increasing the income of farmers. The food safety and the nutritional quality are critical, and the analysis in the report of national food poisoning in 2017 shows that the bacterial poisoning accounts for more than 50%, so that the sterilization is the primary process in the food processing and production process, and the food safety is ensured through the sterilization. In the early development stage of laggard technical level, firstly, edible safety is ensured, and part of nutrition can be tolerated to be lost; with the gradual improvement of science and technology and living standard, on the premise of ensuring food safety, more and more consumers are more favored to foods which are convenient, high in quality, natural in flavor, mellow in taste and fresh in appearance, and higher requirements are also put forward for obtaining the minimum processing of the foods.
At present, the sterilization process mainly takes thermal sterilization as a main process and is supplemented with chemical agent sterilization and ultraviolet sterilization. However, the original color, flavor, taste and shape of the food are easily damaged by heat treatment, and the loss of heat-sensitive substances and the loss of nutritional ingredients are caused. The latter two types belong to traditional non-heat treatment technologies, and chemical agent sterilization is mainly suitable for large-batch sterilization, but has the defects of more process parameters, difficult control, chemical substance residue and the like, and most chemical substances contain carcinogenic substances and can threaten human health. The ultraviolet ray can kill various microorganisms without residual substances, but the ultraviolet ray has lower irradiation energy and weak penetrating power and only has a killing effect on the microorganisms directly irradiated.
The plasma is rich in active particles, such as OH free radicals, excited O atoms, N2, N +2 and the like; in addition, there are also a large number of energetic particles, such as electrons, and ultraviolet rays accompanying the discharge; and an externally applied electric field and a self-generated electric field generated by the plasma. Research shows that the bacteria in the liquid food can be acted on by the bacteria, so that the bacteria are inactivated, and a good sterilization effect is achieved.
In recent years, a large number of non-thermal sterilization devices have been developed at home and abroad, mainly focusing on plasma sterilization and pulsed electric field sterilization, but only an invention combining the two has emerged. For example, wangdcheng et al, china agricultural university, uses needle plate electrode to generate plasma, sterilizes ensilage raw materials, and is matched with a conveyor belt to achieve continuous sterilization. However, this device has the disadvantages that the needle plate electrode generates plasma unevenly and has a small area, and the plasma generated is poor in continuity. A closed plasma sterilization device is designed in the article of Lifei major science and technology Limited, lihongjun and Su, and comprises a box for placing articles to be sterilized and a vacuum pumping device, an air charging device and a microwave generating device which are respectively communicated with the box. The disadvantage of this device is that it is cumbersome to use and requires a vacuum device, which does not allow for continuous sterilization. Zhang Changli, yanfang, etc. utilize high-voltage pulse electric field sterilization processing apparatus, solved the problem that current high-voltage pulse sterilization apparatus cost is high and retort room structure is unreasonable to be applied to the liquid field of disinfecting. However, this apparatus has a disadvantage that the treatment chamber is a sealed rectangular parallelepiped space, and continuous flow treatment cannot be performed, which prevents large-scale industrialization.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is well known to those of ordinary skill in the art.
Disclosure of Invention
In view of the above problems, the present invention provides a fluid food sterilization apparatus and a method thereof, which can generate uniform, stable, large-area plasma in atmospheric air, and sterilize with pulsed electric field, thereby achieving convenient and efficient sterilization and preservation. .
The purpose of the invention is realized by the following technical scheme.
A fluid food sterilization device comprises a fluid food sterilization device,
a surface dielectric barrier discharge structure configured to generate a downward-diffusing in-plane plasma, the surface dielectric barrier discharge structure comprising,
a barrier dielectric layer comprised of an insulating dielectric material,
the metal of the gold immersion layer is deposited on the upper surface of the barrier dielectric layer, and the gold immersion layer is provided with a first electrode hole;
a gold immersion grid layer, the PCB of which is printed on the lower surface of the barrier dielectric layer, the gold immersion grid layer for generating uniform plasma is provided with a second electrode hole, the gold immersion grid layer is provided with diamond grids,
a high voltage power supply electrically connected to the first electrode hole and the second electrode hole;
the cooling device is arranged above the surface dielectric barrier discharge structure, and faces and cools the gold immersion layer;
the conveying groove is arranged below the surface dielectric barrier discharge structure to convey the fluid food towards the gold immersion grid layer, so that the downward diffused surface plasma acts on the fluid food;
a high-voltage end which comprises a connector lug arranged at the top of the high-voltage end and a plurality of steel pins vertically extending from the outer surface of the high-voltage end,
a high-frequency pulse power supply which is electrically connected with the connector lug,
an outer wall which is arranged around the high-voltage end as an axis and is connected with the ground electrode, an annular gap is formed between the outer wall and the high-voltage end,
a first buffer tank with flow rate controllable to guide the liquid food from the transfer groove into the annular gap, wherein the first buffer tank is vertically connected to a first side of the high-pressure end close to the top in a sealing way,
a second buffer tank controllably fluidly directing the comestible fluid out of the annular gap, the second buffer tank being vertically hermetically attached to a second side opposite the first side, the first and second buffer tanks sealing the annular gap.
In the fluid food synergistic sterilization device, the gold immersion layer and the gold immersion grid layer are symmetrical relative to the barrier medium layer.
In the fluid food synergistic sterilization device, the areas of the gold immersion layer and the gold immersion grid layer are equal, and the gold immersion layer and/or the gold immersion grid layer are circular or square.
In the fluid food sterilization device in coordination, the blocking medium layer comprises an alumina ceramic plate, the high-voltage power supply comprises a sine alternating-current power supply, a pulse or radio-frequency voltage waveform, the voltage amplitude of the high-voltage power supply is larger than 6kV, the rising edge and the pulse width of the high-frequency pulse power supply are adjustable, and the voltage amplitude is 5kV-15kV.
In the fluid food sterilization device in coordination, the cooling device comprises a fan and an air path made of organic glass, one end of the air path faces the fan, the other end of the air path faces the gold-deposited layer, and the size of the fan is 60mm.
In the fluid food sterilization device in coordination, the angle of the rhombic grids is 60 degrees.
In the fluid food sterilization device, the gap between the conveying groove and the gold immersion grid layer is adjustable.
In the fluid food synergistic sterilization device, the adjustment range of the gap is 1cm-5cm.
In the fluid food sterilization device, the fluid food sterilization device comprises a plurality of surface dielectric barrier discharge structures arranged in an array and a plurality of annular gaps.
According to another aspect of the present invention, a sterilization method of the fluid food sterilization apparatus comprises the following steps,
the high-voltage power supply supplies power to the surface dielectric barrier discharge structure through the first electrode hole and the second electrode hole, and the gold immersion grid layer generates downward-diffused surface plasma;
the conveying groove conveys the fluid food towards the gold precipitation grid layer, and the downward diffused surface plasma acts on the fluid food to sterilize;
the flow rate of the first buffer tank can controllably lead the fluid food from the conveying groove into the annular gap, and the high-voltage end and the outer wall form a pulse electric field between the annular gap, and the pulse electric field acts on the fluid food in the annular gap;
a second buffer tank flow rate controllably directs comestible fluid out of the annular gap.
Compared with the prior art, the invention has the beneficial effects that:
compared with the traditional heat sterilization, the invention can obviously improve the biological activity of the product, more importantly, the excessive use of chemical solvents is reduced, and the edible safety of the fluid food is improved; avoids overhigh traditional processing temperature and reduces the damage degree of the nutrient content of the fluid food. The invention has better treatment effect, faster speed, more thorough sterilization, cleaner product and much lower nutrition loss and energy consumption than the prior art; compared with the conventional PEF treatment generator, the treatment cavity has larger volume and higher treatment efficiency; the two ends can be opened for pressurization, so that the device has the capability of treating flowing fluid and supports continuous sterilization at different flow rates; and the sterilization pipeline can be extended or arranged according to industrial requirements by adopting a coaxial structure. Compared with a single sterilization mode, the sterilization device has better effect and higher efficiency.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly apparent, and to make the implementation of the content of the description possible for those skilled in the art, and to make the above and other objects, features and advantages of the present invention more obvious, the following description is given by way of example of the specific embodiments of the present invention.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. Also, like parts are designated by like reference numerals throughout the drawings.
In the drawings:
FIG. 1 is a side view of a surface dielectric barrier discharge structure of a fluid food sterilization device in cooperation with a sterilization apparatus according to the present invention;
FIG. 2 is a schematic top view of a surface dielectric barrier discharge structure of a fluid food sterilization apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic bottom view of a surface dielectric barrier discharge structure of the cooperative fluid food sterilization apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic top view of a surface dielectric barrier discharge structure of a fluid food sterilization apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic bottom view of a surface dielectric barrier discharge structure of the cooperative fluid food sterilization apparatus according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a pulse sterilization part of the fluid food synergistic sterilization device according to one embodiment of the present invention;
fig. 7 is an overall flow chart of the fluid food sterilization device according to an embodiment of the present invention.
The invention is further explained below with reference to the figures and examples.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to fig. 1 to 7. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the invention is to be determined by the claims appended hereto.
For the convenience of understanding the embodiments of the present invention, the following detailed description will be given by way of example with reference to the accompanying drawings, and the drawings are not intended to limit the embodiments of the present invention.
For better understanding, as shown in fig. 1 to 6, a fluid food sterilization apparatus includes,
a surface dielectric barrier discharge structure configured to generate a downward-diffusing in-plane plasma, the surface dielectric barrier discharge structure comprising,
a barrier dielectric layer 1, which is composed of an insulating dielectric material,
the metal of the gold-depositing layer 2 is deposited on the upper surface of the barrier medium layer 1, and the gold-depositing layer 2 is provided with a first electrode hole 4;
the gold immersion grid layer 3 is printed on the lower surface of the barrier dielectric layer 1 through a PCB (printed Circuit Board), the gold immersion grid layer 3 for generating uniform plasma is provided with a second electrode hole 5, the gold immersion grid layer 3 is provided with a rhombic grid, and a high-voltage power supply is electrically connected with the first electrode hole 4 and the second electrode hole 5;
the cooling device is arranged above the surface dielectric barrier discharge structure, and faces and cools the gold deposition layer 2;
and the conveying groove is arranged below the surface dielectric barrier discharge structure to convey the fluid food towards the gold immersion grid layer 3, so that the downward diffused surface plasma acts on the fluid food.
A high voltage terminal 6 including a connector lug 11 provided at the top thereof and a plurality of steel pins 7 vertically extending from the outer surface of the high voltage terminal,
a high-frequency pulse power supply which is electrically connected with the connector lug 11,
an outer wall 10 which is arranged around the high-voltage end as an axis and is connected with the ground electrode, an annular gap is formed between the outer wall 10 and the high-voltage end 6,
a first buffer tank 9 whose flow rate can controllably lead the fluid food from the transfer groove into the annular gap, the first buffer tank 9 is vertically connected with the first side of the high-pressure end close to the top in a sealing way,
a second buffer tank 8 whose flow rate controllably leads the liquid food out of the annular gap, the second buffer tank 8 being vertically hermetically connected to a second side opposite to the first side, the first buffer tank and the second buffer tank sealing the annular gap.
The fluid food to be processed is firstly subjected to a surface dielectric barrier discharge plasma sterilization stage, then is subjected to a pulsed electric field sterilization part, and is subjected to two times of uninterrupted sterilization, so that a better processing effect and higher efficiency can be achieved.
In the preferred embodiment of the fluid food synergistic sterilization device, the gold deposition layer 2 and the gold deposition grid layer 3 are symmetrical relative to the barrier medium layer 1.
In the preferred embodiment of the fluid food synergistic sterilization device, the areas of the gold immersion layer 2 and the gold immersion grid layer 3 are equal, and the gold immersion layer 2 and/or the gold immersion grid layer 3 are circular or square.
In the preferred embodiment of the cooperative sterilization device for fluid food, the barrier medium layer 1 comprises an alumina ceramic plate, the high-voltage power supply comprises a sinusoidal alternating-current power supply, a pulse or radio-frequency voltage waveform, and the voltage amplitude of the high-voltage power supply is greater than 6kV.
In a preferred embodiment of the cooperative fluid food sterilization device, the cooling device includes a fan and an air path made of plexiglass, and one end of the air path faces the fan and the other end faces the gold immersion layer 2.
In a preferred embodiment of the fluid food sterilization apparatus, the fan is sized according to the size of the SDBD.
In the preferred embodiment of the fluid food sterilization apparatus, the gap between the transfer tank and the immersion gold mesh layer 3 is adjustable.
In a preferred embodiment of the fluid food sterilization apparatus in cooperation with sterilization, the adjustment range of the gap is 1cm-5cm.
In a preferred embodiment of the cooperative fluid food sterilization device, the fluid food sterilization device comprises a plurality of surface dielectric barrier discharge structures arranged in an array and a plurality of annular gaps.
In a preferred embodiment of the cooperative fluid food sterilization apparatus, the conveying tank is connected to the control unit, so that the fluid food passes through the position right below the gold immersion mesh layer 3 at the time of discharging of the gold immersion mesh layer 3.
In a preferred embodiment of the fluid food sterilization apparatus in cooperation with a sterilization apparatus, the angle of the diamond-shaped grid is 60 degrees.
In a preferred embodiment of the fluid food sterilization apparatus in cooperation therewith, the first electrode hole 4 and the second electrode hole 5 are threaded holes for connecting bolts and further connecting a high voltage power supply.
In the preferred embodiment of the fluid food sterilization apparatus, the connector lug 11 is detachably connected to the high voltage terminal 6.
In the preferred embodiment of the fluid food sterilization apparatus, the steel needles 7 are uniformly distributed on the side surface of the high-pressure end 1, the distance between the two steel needles 7 is larger than the radius of the high-pressure end 6, and the length of the steel needle 7 is smaller than the radius of the high-pressure end 1.
In the preferred embodiment of the fluid food sterilization device, the radius of the shaft of the high-pressure end 6 is 1.5-3mm, and the outer diameter of the outer wall 10 is 3-8mm.
In the preferred embodiment of the fluid food sterilization apparatus, the outer wall 10 is grounded by a soft electrode.
In the preferred embodiment of the fluid food sterilization apparatus, the high pressure end 6 and the outer wall 10 of the reactor are made of stainless steel.
In a preferred embodiment of the fluid food sterilization device in cooperation with the fluid food sterilization device, the rising edge and the pulse width of the high-frequency pulse power supply are adjustable, and the voltage amplitude is 5kV-15kV.
In the preferred embodiment of the fluid food sterilization apparatus, the high pressure end 6 is connected with the first buffer tank 9 and the second buffer tank 8 by a gasket in a threaded manner.
In the preferred embodiment of the fluid food sterilization apparatus, the flow rate of the first buffer tank 9 is not greater than the flow rate of the second buffer tank 8.
In one embodiment, as shown in fig. 2 to 3, the gold immersion layer 2 and the gold immersion mesh layer 3 are circular layers, a top corner portion of the circular layer of the gold immersion layer 2 extends to form a threaded first electrode hole 4, and a diagonal position of the top corner portion of the circular layer of the gold immersion mesh layer 3 extends to form a threaded second electrode hole 5.
In one embodiment, as shown in fig. 4 to 5, the gold immersion layer 2 and the gold immersion mesh layer 3 are square layers, a top corner portion of the square layer of the gold immersion layer 2 extends out of a threaded first electrode hole 4, and a diagonal position of the top corner portion of the square layer of the gold immersion mesh layer 3 extends out of a threaded second electrode hole 5. The threaded electrode holes are beneficial to installation, and the diagonal arrangement is beneficial to saving the installation space, and especially the area for generating the surface plasma is not occupied.
To further understand the present invention, in one embodiment, the fluid food sterilization device comprises a plurality of dielectric barrier discharge structures for generating plasma, the structure is divided into three layers, the middle is alumina ceramic which is used as a barrier dielectric, the front surface of the alumina ceramic is coated with copper and deposited with gold, the alumina ceramic is provided with holes to be connected with electrodes, the back surface of the alumina ceramic is coated with diamond grids by a PCB printing technology, and the copper is deposited with gold again to generate uniform plasma.
The plasma generator further comprises a cooling device, wherein a small fan is arranged above the side of the blocking medium high-voltage electrode, an organic glass box is used for limiting an air path, and the surface medium blocking discharge plasma generator is cooled by air.
And a high voltage power supply, one end of which is connected with a first electrode hole 4 at the upper part of the ceramic plate through a metal rod, and the other electrode is connected with a second electrode hole 5 at the lower part of the ceramic plate in the same way.
And a fluid conveyor belt is arranged below the plasma of the fluid conveyor groove to ensure that the fluid food is continuously treated.
The invention has the further improvement that the pulse electric field sterilization part is of a coaxial structure, the middle shaft in the pulse electric field sterilization part is a high-voltage side, the stainless steel outer wall at the tail part is a ground electrode, fluid food enters and fills the gap between the plasma part and the tail part, and the fluid passes through the pipeline at a controllable speed and is treated by the pulse electric field according to the principle of a communicating vessel, so that the sterilization effect is obtained. The invention combines plasma sterilization and pulsed electric field sterilization, and improves the sterilization effect and efficiency.
The invention is further improved in that the dielectric barrier discharge structure adopts surface dielectric barrier discharge for generating large-area uniform diffusion plasma.
The invention further improves the structure that the discharge structure is optimized by adopting the printed circuit board technology, solves the problem of the adhesion of the electrode and the dielectric plate, and reduces the local overheating and uneven stress.
A further improvement of the present invention is the use of diamond sizes for the most efficient discharge for plasma generation.
The invention is further improved by adopting a certain specification, such as round or square insulating dielectric material, such as alumina ceramic, as a barrier medium, and the upper side of the barrier medium is printed with a gold immersion copper circle with a corresponding diameter, and the lower side of the barrier medium is printed with a gold immersion diamond copper cylinder with the same diameter as the upper side.
The invention is further improved in that a small cooling fan is arranged above the upper side gold immersion copper circle, the size of the fan is 60mm, and the air path is controlled and fixed by organic glass.
The invention is further improved in that the lower side is paved with a fluid conveying groove to ensure that the fluid food is continuously treated.
The gap between the dielectric barrier discharge structure and the conveyor belt is adjustable within 1-5 cm, and the device has the capability of processing fluid food with different adjustable thicknesses, such as 2-3 cm.
Further improvements of the invention are in high voltage power supplies and are not limited to sinusoidal ac power, pulsed, rf voltage waveforms.
In one embodiment, in the sterilization apparatus, screws are respectively fixed at a first electrode hole 4 and a second electrode hole 5 for connecting a high voltage side and a ground side, respectively, a transfer tank containing fluid food is placed under the apparatus, a voltage is applied, a surface plasma is generated in a mesh and diffused downward to act on the fluid food such as fruit juice or milk, and sterilization is performed. The fluid food passes through the pulse electric field processing part, liquid bacteria or fruit juice to be processed, milk and other fluid food are injected into an annular gap between the high-voltage end 6 and the outer wall 10, after the annular gap is filled with the fluid food, a gasket is placed and screws are tightened, the high-voltage end 6 is connected with the high-voltage end of the pulse power supply, the outer wall 10 is connected with the ground electrode, high-frequency pulse is applied, and processing is started. If continuous flow treatment is needed, two buffer tanks are connected at two sides, fluid food such as fruit juice, milk and the like are filled in the pipeline according to the buffer principle, and the pressure of the buffer tanks is controlled according to industrial requirements so as to control the flow rate.
According to the requirement of sterilization, the HV high-voltage power supply provides external voltage with the amplitude larger than 6kV to realize discharge without noise and with uniform and stable discharge. According to actual requirements, the number of the discharge units can be increased in sequence, the discharge power of the whole device is small, and the national policy requirements on energy conservation and emission reduction are met.
In one embodiment, the sterilization device comprises an air cooling system at the upper side and a fluid conveying groove at the lower side, and a surface dielectric barrier discharge structure in the middle for generating plasma. The surface dielectric barrier discharge structure is composed of three parts, wherein the barrier dielectric is an alumina ceramic plate, a round gold immersion copper sheet is paved on the upper surface, and a gold immersion diamond grid is paved on the lower surface for generating plasma. The top corner of the upper surface is provided with holes for connecting electrodes, and the diagonal position of the lower surface is also provided with holes. Compared with the traditional heat sterilization, the invention not only can obviously improve the biological activity of the product, but also more importantly, reduces the excessive use of chemical solvents and improves the edible safety of fluid food; the overhigh traditional processing temperature is avoided, and the damage degree of the nutrient content of the fluid food is reduced; compared with the common dielectric barrier discharge structure, the surface dielectric barrier discharge structure adopted by the invention has the advantages of more uniform, efficient and large-area plasma generation, and the sterilization effect is obviously improved. The high-voltage pulse power supply provided by the invention can generate a sterilization effect when the amplitude of the applied voltage is 5kV-15kV (corresponding to different effects), has no noise in treatment, good effect and high speed, and has far less nutrient loss than the prior art. According to actual requirements, the length of the treatment pipeline can be increased or the laying mode and position of the pipeline can be changed, the discharge power of the whole device is low, and the national energy-saving and emission-reduction requirements are met.
The sterilization method of the fluid food synergistic sterilization device comprises the following steps,
the high-voltage power supply supplies power to the surface dielectric barrier discharge structure through the first electrode hole 4 and the second electrode hole 5, and the gold immersion grid layer 3 generates downward-diffused edge plasma;
the conveying groove conveys the fluid food towards the gold precipitation grid layer 3, and the downward diffused surface plasma acts on the fluid food to sterilize;
the first buffer tank 9 controllably guides the fluid food from the conveying groove into the annular gap at a flow rate, and the high-voltage end 6 and the outer wall 10 form a pulse electric field between the annular gap, and the pulse electric field acts on the fluid food in the annular gap;
the second buffer tank 8 controllably directs the comestible fluid out of the annular gap at a flow rate.
Industrial applicability
The fluid food synergistic sterilization device and the method can be manufactured and used in the field of sterilization and preservation.
The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (8)
1. A fluid food sterilization device comprises a liquid food sterilization device,
a surface dielectric barrier discharge structure configured to generate a downward diffusing in-plane plasma, the surface dielectric barrier discharge structure comprising:
a barrier dielectric layer comprised of an insulating dielectric material,
a gold-depositing layer, wherein the metal is deposited on the upper surface of the barrier medium layer, the gold-depositing layer is provided with a first electrode hole,
the PCB of the immersion gold grid layer is printed on the lower surface of the barrier dielectric layer, the immersion gold grid layer for generating uniform plasma is provided with a second electrode hole, and the immersion gold grid layer is provided with a diamond grid;
a high voltage power supply electrically connected to the first electrode hole and the second electrode hole;
the cooling device is arranged above the surface dielectric barrier discharge structure, and faces and cools the gold immersion layer;
the conveying groove is arranged below the surface dielectric barrier discharge structure to convey the fluid food towards the gold immersion grid layer, so that the downward diffused surface plasma acts on the fluid food;
the high-voltage end comprises a connector lug arranged at the top of the high-voltage end and a plurality of steel pins vertically extending from the outer surface of the high-voltage end;
a high-frequency pulse power supply electrically connected to the connector lug;
the outer wall is arranged in a surrounding mode by taking the high-voltage end as an axis, the outer wall is connected with the ground electrode, and an annular gap is formed between the outer wall and the high-voltage end;
a first buffer tank having a flow rate controllable to introduce the comestible fluid from the transfer tank into the annular gap, the first buffer tank being vertically hermetically connected to a first side of the high pressure end near the top;
a second buffer tank having a flow rate controllable to direct the comestible fluid out of the annular gap, the second buffer tank being vertically hermetically connected to a second side opposite the first side,
the first and second surge tanks seal the annular gap,
the gap between the conveying groove and the gold precipitation grid layer is adjustable, and the conveying groove is connected with a control unit, so that the fluid food passes through the position right below the gold precipitation grid layer at the moment of discharging of the gold precipitation grid layer.
2. The cooperative fluid food sterilization device as defined in claim 1, wherein the gold immersion layer and the gold immersion mesh layer are symmetrical with respect to the barrier medium layer.
3. The cooperative sterilization device for fluid food as claimed in claim 1, wherein the gold immersion layer and the gold immersion mesh layer have the same area, and the gold immersion layer and/or the gold immersion mesh layer have a circular or square shape.
4. The cooperative sterilization apparatus for fluid food as claimed in claim 1, wherein the blocking medium layer comprises an alumina ceramic plate, the high voltage power source comprises a sinusoidal ac power source, a pulse or a rf voltage waveform, the amplitude of the voltage of the high voltage power source is greater than 6kV, the rising edge and the pulse width of the rf pulse power source are adjustable, and the amplitude of the voltage is 5kV-15kV.
5. The cooperative sterilization device for fluid food as claimed in claim 1, wherein the cooling device comprises a fan and an air path made of plexiglass, one end of the air path faces the fan, the other end faces the gold immersion layer, and the size of the fan is 60mm.
6. The cooperative sterilization apparatus for fluid food as recited in claim 1, wherein the angle of the diamond-shaped mesh is 60 degrees.
7. The cooperative sterilization apparatus for comestible fluid of claim 1, wherein the cooperative sterilization apparatus for comestible fluid comprises a plurality of surface dielectric barrier discharge structures arranged in an array and a plurality of annular gaps.
8. A sterilization method of the fluid food sterilization apparatus in coordination with sterilization equipment as claimed in any one of claims 1 to 7, comprising the steps of,
the high-voltage power supply supplies power to the surface dielectric barrier discharge structure through the first electrode hole and the second electrode hole, and the gold deposition grid layer generates downward-diffused surface plasma;
the conveying groove conveys the fluid food towards the gold precipitation grid layer, and the downward diffused surface plasma acts on the fluid food to sterilize;
the first buffer tank controllably guides the fluid food from the conveying groove into the annular gap at a flow rate, and a pulse electric field is formed between the high-voltage end and the outer wall of the first buffer tank and acts on the fluid food in the annular gap;
a second buffer tank flow rate controllably directs comestible fluid out of the annular gap.
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| WO2014010768A1 (en) * | 2012-07-13 | 2014-01-16 | 주식회사 에스피텍 | Dielectric barrier discharge-type electrode structure for generating plasma |
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