CN211451522U - Circulating carbon dioxide sprays quick-freeze system - Google Patents
Circulating carbon dioxide sprays quick-freeze system Download PDFInfo
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- CN211451522U CN211451522U CN201921819596.2U CN201921819596U CN211451522U CN 211451522 U CN211451522 U CN 211451522U CN 201921819596 U CN201921819596 U CN 201921819596U CN 211451522 U CN211451522 U CN 211451522U
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Abstract
The utility model discloses a circulating carbon dioxide sprays quick-freeze system. The utility model adopts a carbon dioxide air supplement tank, a carbon dioxide cooling circulation system, an infusion pump, a single-fluid combined nozzle, a freezing chamber, a conveyor belt, a pressure regulating valve, a waste gas recovery device and a compressor; the refrigerant is recycled in the spray quick-freezing process, the loss of the refrigerant is greatly reduced, and the cost of spray quick-freezing is saved; the freezing process is carried out in a low-oxygen environment, so that food is prevented from being oxidized, and the fresh-keeping quality in the quick-freezing process is improved; the single-fluid combined nozzle strengthens the spray quick-freezing effect; the spray liquid mainly comprises low-pressure condensate, and the high-pressure condensate mainly plays an auxiliary role in precooling, supercharging, mixing and the like, so that the safety of the system is enhanced; the refrigerants in different states in the circulation are reasonably selected according to different purposes, so that the cascade utilization of energy is realized, the refrigerating capacity of carbon dioxide in the circulation is fully exerted, and the running energy consumption required by the circulation is saved.
Description
Technical Field
The utility model relates to a frozen object cold chain fresh-keeping technology, concretely relates to circulating carbon dioxide sprays quick-freeze system.
Background
The liquid carbon dioxide spray quick-freezing technology is a direct contact type freezing technology, fully utilizes the characteristics of high vaporization latent heat, stable chemical property and small freezing dry loss of the liquid carbon dioxide, avoids freezing damage caused by excessive contact through fluidized spray, can quickly cool and freeze a frozen object in a short time, is a high-quality freezing technology, and is widely applied to storage and fresh keeping of fresh and perishable frozen objects. However, the spray quick-freezing devices used at present are all open systems, and the refrigerant is extracted by the exhaust fan after phase change and directly discharged into the environment, so that great resource waste is caused, and the operation cost of the spray quick-freezing system is greatly increased; in addition, hot air flow can be introduced into a multi-fluid nozzle commonly used at present in the spraying process to influence the actual heat exchange efficiency of spraying liquid, in a single-fluid nozzle commonly used, a hollow conical nozzle can obtain small-sized liquid drops, but the spraying liquid is concentrated on a conical surface, the coverage range and uniformity are deficient, a solid conical nozzle can realize uniform coverage, the obtained liquid drops have larger size and influence the vaporization heat exchange effect of the liquid drops, and the actual freezing capacity of the spraying quick-freezing technology at present is limited due to the limitation of the form of the nozzle.
Disclosure of Invention
For the recovery and the reuse of realizing the spraying system refrigerant, improve the nozzle configuration simultaneously and spray the heat transfer effect in order to strengthen, the utility model provides a circulating carbon dioxide sprays quick-freeze system.
The utility model discloses a circulating carbon dioxide sprays quick-freeze system includes: the system comprises a carbon dioxide air supplementing tank, a carbon dioxide cooling circulation system, an infusion pump, a single-fluid combined nozzle, a freezing chamber, a conveying belt, a pressure regulating valve, an exhaust gas recovery device and a first compressor; the carbon dioxide gas supplementing tank is connected to the carbon dioxide cooling circulation system through a pipeline, and an electronic expansion valve and a pressure sensor are arranged on the pipeline connecting the carbon dioxide gas supplementing tank to the carbon dioxide cooling circulation system; the carbon dioxide cooling circulation system is connected to the infusion pump through a pipeline; the infusion pump is connected to a plurality of uniformly distributed single-fluid combined nozzles through pipelines; the side wall of the freezing chamber is provided with a pressure regulating valve; a conveyor belt is arranged in the freezing chamber, and the frozen objects are uniformly placed on the conveyor belt; a plurality of uniformly distributed single fluid combination nozzles are positioned in the freezing chamber opposite to the conveyor belt; the exhaust gas recovery device is positioned on the other side, opposite to the single-fluid combined nozzle, in the freezing chamber and connected to a first compressor outside the freezing chamber through a pipeline; the first compressor is connected to the carbon dioxide cooling circulation system through a pipeline.
Before the freezing object is cooled, the pressure regulating valve is opened, the carbon dioxide is conveyed to the carbon dioxide cooling circulation system by the carbon dioxide air supplementing tank, the carbon dioxide liquid is conveyed to the auxiliary nozzle of the single-fluid combined nozzle by the liquid conveying pump, the auxiliary nozzle sprays carbon dioxide liquid drops, air in the freezing cavity is discharged, and the pressure in the freezing cavity reaches the pressure required during freezing; during freezing, the electronic expansion valve controls the gas supplementing amount through a feedback signal of the pressure sensor, and the carbon dioxide gas supplementing tank delivers carbon dioxide to the carbon dioxide cooling circulation system; the carbon dioxide cooling circulation system forms a closed refrigeration loop of a carbon dioxide working medium; carbon dioxide liquid in the carbon dioxide cooling circulation system is transmitted to the single-fluid combined nozzle through the infusion pump; the frozen objects in the freezing chamber sequentially pass through the single-fluid combined nozzle through the conveying belt; the single-fluid combined nozzle sprays carbon dioxide liquid to the frozen object to refrigerate the frozen object; the exhaust gas recovery device sucks the carbon dioxide gas which is expanded and vaporized after refrigeration, and the carbon dioxide gas is compressed and cooled again through the first compressor and conveyed back to the carbon dioxide cooling circulation system, so that circulating spraying is realized.
A single fluid combination nozzle comprising: a primary nozzle and a secondary nozzle; wherein, the main nozzle adopts a hollow cone type nozzle; the auxiliary nozzle is a solid cone nozzle; the spraying direction of the main nozzle is opposite to the freezing object conveyor belt; the injection direction of the auxiliary nozzle and the main nozzle form an included angle; the included angle ranges from 30 degrees to 45 degrees; the main nozzle produces a large amount of jet flow containing small-size liquid drops through spraying to achieve a freezing effect, and the auxiliary nozzle produces a small amount of jet flow containing medium-size liquid drops through spraying. The main nozzle and the sub-nozzle are provided with a main nozzle regulating valve and a sub-nozzle regulating valve, respectively.
The carbon dioxide cooling cycle system includes: the system comprises a carbon dioxide gas-liquid separator, a second compressor, a heat exchanger, a waste heat recycling system, a carbon dioxide liquid storage device and a throttle valve; the carbon dioxide gas-liquid separator is connected to the second compressor through a pipeline; the second compressor is connected to the heat exchanger through a pipeline; the heat exchanger is connected with a waste heat recycling system; the heat exchanger is connected to a carbon dioxide reservoir through a pipeline; the carbon dioxide reservoir is connected to the throttling valve through a pipeline; the throttle valve is connected to the carbon dioxide gas-liquid separator through a pipeline; the carbon dioxide gas-liquid separator is connected to a first infusion pump through a pipeline, the first infusion pump is connected to the main nozzle through a pipeline, and a main nozzle regulating valve is arranged; the pipeline connected with the main nozzle is connected back to the carbon dioxide gas-liquid separator, and a pressure sensor is arranged on the pipeline; the carbon dioxide reservoir is connected to a second infusion pump through a pipeline, the second infusion pump is connected to the auxiliary nozzle through a pipeline, and the auxiliary nozzle adjusting valve is arranged. Carbon dioxide is conveyed to a carbon dioxide gas-liquid separator by a carbon dioxide gas supplementing tank, and carbon dioxide liquid and carbon dioxide gas are separated in a gravity settling mode; the carbon dioxide gas is conveyed to a second compressor from a pipeline positioned at the top of the carbon dioxide gas-liquid separator, the saturated carbon dioxide gas is compressed to be in a superheated state, and the superheated carbon dioxide gas is conveyed to a heat exchanger; the heat exchanger absorbs heat in the carbon dioxide gas, converts the heat into carbon dioxide liquid and transmits the heat to the waste heat recycling system; the carbon dioxide liquid is transmitted to a carbon dioxide liquid storage device; the temperature of the carbon dioxide liquid in the carbon dioxide liquid storage device is higher than that of the carbon dioxide liquid in the carbon dioxide gas-liquid separator; the carbon dioxide liquid storage device is conveyed to the auxiliary nozzle through a second infusion pump for spraying; the carbon dioxide liquid in the carbon dioxide liquid storage device is subjected to pressure reduction and throttling through a throttling valve, and is transmitted to a carbon dioxide gas-liquid separator after being cooled and depressurized so as to enhance the refrigerating capacity of the spray liquid; and conveying the carbon dioxide liquid in the carbon dioxide gas-liquid separator as a spray liquid to a main nozzle for spraying through a first conveying pump. The incoming flow of the main nozzle is low-temperature carbon dioxide condensate in the carbon dioxide gas-liquid separator, and the freezing effect is realized by spraying to generate a large amount of jet flow containing small-size liquid drops; the incoming flow of the auxiliary nozzle is high-pressure carbon dioxide condensate in a carbon dioxide liquid storage device, a small amount of jet flow containing medium-sized liquid drops is generated through spraying, on one hand, the jet flow is used for discharging residual air in a freezing chamber of a freezing chamber before freezing to prevent food from being oxidized in the freezing process, on the other hand, the jet flow is mixed with the jet flow of the main nozzle in a pulsating jet flow mode to enhance the overall coverage uniformity of the jet flow of the nozzle, and therefore the spraying and freezing effect is enhanced.
The conveying belt is a U-shaped conveying belt and is positioned between the exhaust gas recovery device and the single-fluid combined nozzle; the conveyer belt includes two parallel along horizontal main belt of each other to and connect the perpendicular conveyer belt of the two, main belt is connected as a whole with perpendicular conveyer belt, and main belt is 3 with perpendicular conveyer belt length ratio: 1-5: 1; a plurality of air distribution partition plates are uniformly arranged on the conveying belt, and the direction of the air distribution partition plates is vertical to the conveying direction of the main conveying belt; evenly set up a plurality of draught fans between two main conveyer belts, set up the induced air baffle between adjacent draught fan, the induced air baffle is on a parallel with the cloth wind baffle. The induced air partition plate is matched with the air distribution partition plate and the induced draft fan on the conveyor belt, incoming flows of the single-fluid combined nozzle are integrated to form a carbon dioxide flow field which is uniform in the transverse direction and longitudinal along the temperature gradient, meanwhile, the conveyor belt is U-shaped, a freezing mode that a frozen object is pre-cooled and then frozen is formed by utilizing the smooth property, and the refrigerating capacity of the carbon dioxide in the freezing chamber is fully utilized.
The air inducing partition board and the air distributing partition board are made of one of plastics, wood boards and glass fibers, such as ABS (terpolymer of acrylonitrile, butadiene and styrene) boards or PS (polystyrene) boards.
The outer part of the wall body of the freezing chamber adopts protective materials, and the inner part of the wall body of the freezing chamber adopts heat-insulating materials, so that the heat insulation of the wall body of the chamber is ensured, and the wall body of the chamber has better sealing performance.
The air-vent valve is located freezing cavity and is close to single fluid combination formula nozzle one side, and the outer end sets to the inflating valve structure, can discharge freezing cavity interior gas in an appropriate amount and isolated external gas gets into, prevents simultaneously that liquid carbon dioxide liquid from causing freezing cavity internal pressure to fluctuate by a wide margin because the volume expands rapidly when erupting, guarantees that freezing cavity internal pressure is whole stable.
The exhaust gas recovery device comprises an exhaust fan, an air collecting port and an exhaust fan rear adjusting valve; wherein, the exhaust fan and the air collecting opening are positioned in the freezing chamber, and the air suction opening of the exhaust fan and the single-fluid combined nozzle are positioned on the other side of the freezing chamber relatively; the exhaust outlet of the exhaust fan is opposite to the air collecting port; the air collecting port is connected to the first compressor through a pipeline; an exhaust fan rear regulating valve is arranged on the pipeline connected with the air collecting opening; the exhaust fan sucks the expanded and vaporized carbon dioxide gas, and the carbon dioxide gas is collected and conveyed to the first compressor through the air collecting port, so that carbon dioxide exhaust gas is recycled to be cooled again while longitudinal temperature gradient is smooth, and the purpose of circulating spraying is achieved.
The utility model has the advantages that:
(1) the refrigerant is recycled in the spray quick-freezing process, the loss of the refrigerant is greatly reduced, and the cost of spray quick-freezing is saved;
(2) the freezing process is carried out in a low-oxygen environment, so that food is prevented from being oxidized, and the fresh-keeping quality in the quick-freezing process is improved;
(3) the single-fluid combined nozzle is provided, the problem that the size of liquid drops and the spraying uniformity cannot be considered by the traditional single-fluid nozzle is solved, and the spraying and quick-freezing effects are enhanced;
(4) the spray liquid mainly comprises low-pressure condensate, and the high-pressure condensate mainly plays an auxiliary role in precooling, supercharging, mixing and the like, so that the safety of the system is enhanced;
(5) the refrigerants in different states in the circulation are reasonably selected according to different purposes, so that the cascade utilization of energy is realized, the refrigerating capacity of carbon dioxide in the circulation is fully exerted, and the running energy consumption required by the circulation is saved.
Drawings
FIG. 1 is a schematic view of an embodiment of a circulating carbon dioxide spray quick-freezing system of the present invention;
fig. 2 is a schematic view of a single fluid combined nozzle of the circulating carbon dioxide spray quick-freezing system of the present invention.
Detailed Description
The invention will be further elucidated by means of specific embodiments in the following with reference to the drawings.
As shown in fig. 1, the circulating carbon dioxide spray quick-freezing system of the present embodiment includes: a carbon dioxide gas supplementing tank 1, a carbon dioxide cooling circulation system, first and second liquid delivery pumps 31 and 32, a single-fluid combination nozzle 13, a freezing chamber 18, a conveyor belt 14, a pressure regulating valve 19, a waste gas recovery device 17 and a first compressor 41; wherein the single fluid combined nozzle 13 comprises a main nozzle and an auxiliary nozzle; the carbon dioxide cooling cycle system includes: the system comprises a carbon dioxide gas-liquid separator 5, a second compressor 42, a heat exchanger 6, a waste heat recycling system 8, a carbon dioxide liquid storage device 7 and a throttle valve 9; the carbon dioxide gas supplementing tank 1 is connected to a carbon dioxide gas-liquid separator of a carbon dioxide cooling circulating system through a pipeline, and an electronic expansion valve 2 and a pressure sensor P are arranged on the pipeline connecting the carbon dioxide gas supplementing tank to the carbon dioxide cooling circulating system; the carbon dioxide gas-liquid separator 5 is connected to the second compressor 42 through a pipe; the second compressor 42 is connected to the heat exchanger 6 by a pipe; the heat exchanger 6 is connected with a waste heat recycling system 8; the heat exchanger 6 is connected to a carbon dioxide reservoir 7 through a pipeline; the carbon dioxide reservoir 7 is connected to the throttle valve 9 through a pipeline; the throttle valve 9 is connected to the carbon dioxide gas-liquid separator 5 through a pipeline; the carbon dioxide gas-liquid separator 5 is connected to a first infusion pump 31 through a pipeline, the first infusion pump 31 is connected to a main nozzle through a pipeline, and the main nozzle regulating valve 11 is arranged on the pipeline; the pipeline connected with the main nozzle is connected back to the carbon dioxide gas-liquid separator 5, and a pressure sensor P is arranged on the pipeline; the carbon dioxide reservoir 7 is connected to a second infusion pump 32 through a pipeline, the second infusion pump 32 is connected to the auxiliary nozzle through a pipeline, and the auxiliary nozzle regulating valve 12 is arranged on the pipeline; a pressure regulating valve 19 is arranged on the side wall of the freezing chamber 18; a plurality of uniformly distributed single fluid combination nozzles 13 are located within the freezing chamber 18 opposite the conveyor 14; a conveyor belt 14 is provided in the freezing chamber 18, and the frozen objects are uniformly placed on the conveyor belt 14; the conveyor belt 14 is a U-shaped conveyor belt; the conveyor belt 14 comprises two mutually parallel main conveyor belts along the transverse direction and a vertical conveyor belt connecting the two, wherein the main conveyor belt and the vertical conveyor belt are connected into a whole; a plurality of air distribution partition plates 25 are uniformly arranged on the conveyor belt 14, and the direction of the air distribution partition plates is vertical to the conveying direction of the main conveyor belt; a plurality of induced draft fans 16 are uniformly arranged between the two main conveyor belts, and an induced draft partition plate 15 is arranged between the adjacent induced draft fans and is parallel to the air distribution partition plate; a pressure regulating valve 19 is arranged on the side wall of the freezing chamber 18; the exhaust gas recovery device 17 is positioned on the other side of the freezing chamber 18 opposite to the single-fluid combined nozzle 13 and comprises an exhaust fan, an air collecting port and an exhaust fan rear adjusting valve; the exhaust outlet of the exhaust fan is opposite to the air collecting port; the air collecting port is connected to the first compressor 41 through a pipeline, and a pressure sensor P is arranged on the pipeline; an exhaust fan rear adjusting valve 20 is arranged on a pipeline connected with the air collecting opening.
As shown in fig. 2, the single fluid combination nozzle 13 includes: a main nozzle 131 and a sub-nozzle 132; wherein, the main nozzle adopts a hollow cone type nozzle; the auxiliary nozzle is a solid cone nozzle; the spraying direction of the main nozzle is opposite to the freezing object conveyor belt; the injection direction of the auxiliary nozzle and the main nozzle form an included angle of 40 degrees.
In this embodiment, the length ratio of the main conveyor belt to the vertical conveyor belt is 4: 1; the air inducing partition plate and the air distributing partition plate adopt ABS (terpolymer of acrylonitrile, butadiene and styrene) plates; the outer part of the wall body of the freezing chamber adopts stainless steel as a protective material, and the inner part adopts a polyurethane core plate as a heat-insulating material.
The freezing method of the circulating carbon dioxide spraying quick-freezing system comprises the following steps:
1) uniformly discharging the frozen objects at the inlet of the conveyor belt, closing the outlet and the inlet of the conveyor belt, and simultaneously closing the main nozzle regulating valve and the auxiliary nozzle regulating valve;
2) before the freezing object is cooled, opening the pressure regulating valve, simultaneously conveying carbon dioxide to a carbon dioxide cooling circulation system by a carbon dioxide gas supplementing tank, conveying carbon dioxide liquid in a carbon dioxide liquid reservoir to an auxiliary nozzle by controlling a second liquid conveying pump, spraying carbon dioxide liquid drops by the auxiliary nozzle, discharging air in the freezing cavity, enabling the pressure and the temperature in the freezing cavity to be required during freezing, and closing the pressure regulating valve;
3) during freezing, the electronic expansion valve controls the gas supplementing amount through a feedback signal of the pressure sensor, carbon dioxide is conveyed to the carbon dioxide gas-liquid separator through the carbon dioxide gas supplementing tank, and carbon dioxide liquid and carbon dioxide gas are separated in a gravity settling mode; the carbon dioxide gas is conveyed to a second compressor from a pipeline positioned at the top of the carbon dioxide gas-liquid separator, the saturated carbon dioxide gas is compressed to be in a superheated state, and the superheated carbon dioxide gas is conveyed to a heat exchanger; the heat exchanger absorbs heat in the carbon dioxide gas, converts the heat into carbon dioxide liquid and transmits the heat to the waste heat recycling system; the carbon dioxide liquid is transmitted to a carbon dioxide liquid storage device; the temperature of the carbon dioxide liquid in the carbon dioxide liquid storage device is higher than that of the carbon dioxide liquid in the carbon dioxide gas-liquid separator; the carbon dioxide liquid in the carbon dioxide liquid storage device is subjected to pressure reduction and throttling through a throttling valve, and is transmitted to a carbon dioxide gas-liquid separator after being cooled and depressurized so as to enhance the refrigerating capacity of the spray liquid; carbon dioxide liquid in the carbon dioxide gas-liquid separator is used as spraying liquid and is conveyed to the main nozzle for spraying through the first infusion pump; meanwhile, the carbon dioxide liquid storage device is conveyed to the auxiliary nozzle through a second infusion pump for spraying; spraying in a periodic pulsating jet flow mode, and mixing with the incoming flow of the main nozzle to ensure that the spraying liquid is uniformly covered;
4) starting a conveyor belt and a draught fan, and starting spray quick freezing in the freezing chamber; the induced air partition plate is matched with an air distribution partition plate and an induced draft fan on the conveyor belt, incoming flows of the single-fluid combined nozzle are integrated to form a carbon dioxide flow field which is uniform in transverse direction and longitudinal along a temperature gradient, meanwhile, the conveyor belt is U-shaped, a freezing mode of pre-cooling and re-freezing a frozen object is formed by utilizing the smooth property, and the refrigerating capacity of carbon dioxide in the freezing chamber is fully utilized;
5) the exhaust gas recovery device sucks the expanded and vaporized carbon dioxide gas after refrigeration, compresses and cools the carbon dioxide gas again through the first compressor, and conveys the carbon dioxide gas back to the carbon dioxide cooling circulation system, so that circulating spraying is realized;
6) after the spray freezing is finished, stopping the circulating carbon dioxide spray quick-freezing system, closing the main nozzle regulating valve and the auxiliary nozzle regulating valve, stopping the exhaust gas recovery device, the induced draft fan and the conveyor belt, opening the pressure regulating valve, and discharging residual carbon dioxide in the freezing chamber;
7) and opening the outlet of the conveying belt after the pressure in the freezing chamber reaches the normal pressure, and taking out the frozen object.
Finally, it is noted that the disclosed embodiments are intended to aid in further understanding of the invention, but will be understood by those skilled in the art that: various substitutions and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the present invention should not be limited to the embodiments disclosed, and the scope of the present invention is defined by the appended claims.
Claims (10)
1. A circulating carbon dioxide sprays quick-freeze system, its characterized in that, circulating carbon dioxide sprays quick-freeze system includes: the system comprises a carbon dioxide air supplementing tank, a carbon dioxide cooling circulation system, an infusion pump, a single-fluid combined nozzle, a freezing chamber, a conveying belt, a pressure regulating valve, an exhaust gas recovery device and a first compressor; the carbon dioxide gas supplementing tank is connected to the carbon dioxide cooling circulation system through a pipeline, and an electronic expansion valve and a pressure sensor are arranged on the pipeline connecting the carbon dioxide gas supplementing tank to the carbon dioxide cooling circulation system; the carbon dioxide cooling circulation system is connected to the infusion pump through a pipeline; the infusion pump is connected to a plurality of uniformly distributed single-fluid combined nozzles through pipelines; the side wall of the freezing chamber is provided with a pressure regulating valve; a conveyor belt is arranged in the freezing chamber, and the frozen objects are uniformly placed on the conveyor belt; a plurality of uniformly distributed single fluid combination nozzles are positioned in the freezing chamber opposite to the conveyor belt; the exhaust gas recovery device is positioned on the other side, opposite to the single-fluid combined nozzle, in the freezing chamber and is connected to a first compressor outside the freezing chamber through a pipeline; the first compressor is connected to the carbon dioxide cooling circulation system through a pipeline.
2. The circulating carbon dioxide spray flash freezing system of claim 1, wherein the single fluid combined nozzle comprises: a primary nozzle and a secondary nozzle; wherein the main nozzle adopts a hollow cone type nozzle; the auxiliary nozzle is a solid cone-shaped nozzle; the spraying direction of the main nozzle is opposite to the freezing object conveyor belt; the injection direction of the auxiliary nozzle and the injection direction of the main nozzle form an included angle.
3. The circulating type carbon dioxide spraying quick-freezing system as claimed in claim 2, wherein the included angle between the spraying direction of the auxiliary nozzle and the spraying direction of the main nozzle is in the range of 30-45 °.
4. The circulating carbon dioxide shower flash freezing system of claim 1, wherein the carbon dioxide cooling cycle system comprises: the system comprises a carbon dioxide gas-liquid separator, a second compressor, a heat exchanger, a waste heat recycling system, a carbon dioxide liquid storage device and a throttle valve; wherein the carbon dioxide gas-liquid separator is connected to a second compressor through a pipeline; the second compressor is connected to the heat exchanger through a pipeline; the heat exchanger is connected with a waste heat recycling system; the heat exchanger is connected to a carbon dioxide reservoir through a pipeline; the carbon dioxide reservoir is connected to the throttling valve through a pipeline; the throttle valve is connected to the carbon dioxide gas-liquid separator through a pipeline; the carbon dioxide gas-liquid separator is connected to a first infusion pump through a pipeline, the first infusion pump is connected to the main nozzle through a pipeline, and the main nozzle adjusting valve is arranged; the pipeline connected with the main nozzle is connected back to the carbon dioxide gas-liquid separator, and a pressure sensor is arranged on the pipeline; the carbon dioxide reservoir is connected to a second infusion pump through a pipeline, the second infusion pump is connected to the auxiliary nozzle through a pipeline, and the auxiliary nozzle adjusting valve is arranged.
5. The circulating type carbon dioxide spray quick-freezing system as claimed in claim 1, wherein the conveyor belt is a U-shaped conveyor belt; the conveyor belt comprises two mutually parallel main conveyor belts along the transverse direction and a vertical conveyor belt connecting the two main conveyor belts, and the main conveyor belt and the vertical conveyor belt are connected into a whole.
6. The circulating carbon dioxide shower quick-freeze system of claim 5, characterized in that the length ratio of the main conveyor belt to the vertical conveyor belt is 3: 1-5: 1.
7. the circulating type carbon dioxide spraying quick-freezing system as claimed in claim 5, further comprising an air distribution partition plate, an induced draft fan and an induced draft partition plate; a plurality of air distribution partition plates are uniformly arranged on the conveying belt, and the direction of the air distribution partition plates is vertical to the conveying direction of the main conveying belt; evenly set up a plurality of draught fans between two main conveyer belts, set up the induced air baffle between adjacent draught fan, the induced air baffle is on a parallel with the cloth wind baffle.
8. The circulating type carbon dioxide spraying quick-freezing system as claimed in claim 7, wherein the air inducing partition plate and the air distributing partition plate are made of one of plastic, wood plate and glass fiber.
9. The circulating carbon dioxide spray quick-freezing system of claim 1, wherein the wall of the freezing chamber is made of protective materials at the outer part and heat-insulating materials at the inner part.
10. The circulating type carbon dioxide spray quick-freezing system as claimed in claim 1, wherein the exhaust gas recovery device comprises an exhaust fan, an air collecting port and an exhaust fan rear adjusting valve; wherein, the exhaust fan and the air collecting opening are positioned in the freezing chamber, and the air suction opening of the exhaust fan and the single-fluid combined nozzle are positioned on the other side of the freezing chamber relatively; the exhaust outlet of the exhaust fan is opposite to the air collecting port; the air collecting port is connected to the first compressor through a pipeline; an exhaust fan rear regulating valve is arranged on the pipeline connected with the air collecting opening; the exhaust fan sucks the expanded and vaporized carbon dioxide gas, and the carbon dioxide gas is collected and conveyed to the first compressor through the air collecting port.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110779261A (en) * | 2019-10-28 | 2020-02-11 | 北京大学 | Circulating carbon dioxide spray quick-freezing system and freezing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110779261A (en) * | 2019-10-28 | 2020-02-11 | 北京大学 | Circulating carbon dioxide spray quick-freezing system and freezing method thereof |
| CN110779261B (en) * | 2019-10-28 | 2024-06-18 | 北京大学 | Circulating type carbon dioxide spraying quick-freezing system and freezing method thereof |
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