CN219346880U - Nitrogen refrigerant low-temperature quick-freezing refrigerating system - Google Patents
Nitrogen refrigerant low-temperature quick-freezing refrigerating system Download PDFInfo
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- CN219346880U CN219346880U CN202320102216.3U CN202320102216U CN219346880U CN 219346880 U CN219346880 U CN 219346880U CN 202320102216 U CN202320102216 U CN 202320102216U CN 219346880 U CN219346880 U CN 219346880U
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Abstract
The utility model discloses a nitrogen refrigerant low-temperature quick-freezing refrigerating system which comprises a nitrogen filter, a nitrogen compressor, a nitrogen purifying system and a low-temperature cold box which are sequentially connected through pipelines, wherein a nitrogen precooler and a turbine expander which are connected through pipelines are arranged in the low-temperature cold box, the nitrogen precooler is connected with the nitrogen purifying system through pipelines, and the turbine expander conveys nitrogen which is cooled to below 120 ℃ to a tunnel type low-temperature quick-freezing machine through a low-temperature nitrogen conveying pipe. The low-temperature quick-freezing refrigeration technology of the utility model is suitable for the requirements of all large and medium-sized food quick-freezing industries in China at present, and can greatly improve the refrigeration speed. The equipment configuration is simple, the investment cost is low, the operation energy consumption is low, chemical raw materials such as freon liquid ammonia and the like are not needed to be used as refrigerants, and the pollution-free process is green.
Description
Technical Field
The utility model relates to the technical field of low-temperature quick freezing, in particular to a nitrogen refrigerant low-temperature quick freezing refrigerating system.
Background
Conventional food freezing technologies, including freon refrigeration technology and liquid ammonia refrigeration technology, are used for solving the problems that the refrigerating temperature is high, the refrigerating time is long, large ice grains in food are generated in a slow food freezing process, when the food is thawed, cell tissues in the food are broken to cause the loss of food juice, and the loss of food juice influences the color, taste and nutritional characteristics of the thawed food. Nutrients and natural pigments are also lost with the lost food juice. Especially, the damage of the structure of fruit and vegetable foods can lead to the degradation of the texture and taste of the foods and the loosening of the structure. The cryogenic low-temperature quick-freezing refrigeration technology mentioned by the technology of the patent utilizes the turbine expansion refrigeration technology to directly reduce the temperature of clean nitrogen to below-120 ℃, then utilizes ultralow-temperature nitrogen as a refrigerant to directly contact with food, quickly takes away heat, achieves the purpose of quickly freezing the food, and shortens the freezing time to 2 minutes. Such rapid freezing minimizes ice crystals that are generated and helps preserve the texture of the food product. This also prevents loss of moisture, maintains the original color, taste and texture of the food, and almost reaches the original fresh state of the food.
In terms of environmental protection, the cryogenic low-temperature quick-freezing technology mentioned by the technology has the advantage that the utilized refrigerant is clean nitrogen, and no pollution is caused to food, the atmosphere and the like. The traditional refrigeration technology uses freon or liquid ammonia as a refrigerant, and is a chemical raw material which is forbidden or limited by national regulations. Has great damage to the environment and the living environment of human beings.
In addition, the market at present has the example of purchasing liquid nitrogen and directly utilizing a large amount of liquid nitrogen as a cold source to perform low-temperature quick freezing of food, and the effect is very ideal. But many suppliers have been unsuited due to the increasing market price of liquid nitrogen. In addition, for general food quick freezing, the quick freezing is carried out by using low-temperature liquid nitrogen at the temperature of minus 196 ℃, so that the quick freezing is completely wasteful. However, in the temperature range of-50 ℃ and-196 ℃, no suitable refrigerant can replace liquid nitrogen. The low-temperature refrigeration technology adopted by the technology just makes up the defect of the temperature range, the temperature of the low-temperature nitrogen of the product can be adjusted at random within the range of-50 ℃ to-160 ℃, and the refrigeration cost is far lower than the purchasing cost of liquid nitrogen.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art, and provides a nitrogen refrigerant low-temperature quick-freezing refrigerating system, which overcomes the defects of the existing low-temperature quick-freezing temperature range, the temperature of low-temperature nitrogen of a product can be randomly adjusted within the range from minus 50 ℃ to minus 160 ℃, and the refrigerating cost is far lower than the purchasing cost of liquid nitrogen.
In order to achieve the technical purpose, the utility model provides the following technical scheme:
the utility model provides a nitrogen refrigerant low temperature quick-freezing refrigerating system, includes nitrogen gas filter, nitrogen gas compressor, nitrogen gas clean system and the low temperature cold box that connects gradually through the pipeline, be equipped with nitrogen gas precooler and the turboexpander through the pipe connection in the low temperature cold box, nitrogen gas precooler pass through the pipeline with nitrogen gas clean system connects, the turboexpander will drop to the nitrogen gas below 120 ℃ and carry to tunnel type low temperature quick-freezer through low temperature nitrogen gas conveyer pipe.
And a nitrogen conveying pipe after heat exchange is connected between the tunnel type low-temperature instant freezer and the nitrogen precooler.
The nitrogen precooler is connected with an exhaust gas discharge pipe, the exhaust gas discharge pipe is divided into two branches, a first branch of the exhaust gas discharge pipe is connected with the nitrogen purification system, and a second branch of the exhaust gas discharge pipe is connected with a pipeline connected with the nitrogen filter and the nitrogen compressor.
The nitrogen purification system is connected with a nitrogen regeneration gas blow-down pipe, and a regeneration gas induced draft fan is arranged on the regeneration gas blow-down pipe.
Wherein, be equipped with low temperature nitrogen gas temperature probe and nitrogen gas temperature regulating valve on the low temperature nitrogen gas conveyer pipe.
The waste gas discharge pipe is provided with a waste gas discharge induced draft fan, and the second branch of the waste gas discharge pipe is provided with a waste gas purity probe.
Wherein, the pipeline connecting the nitrogen purification system and the nitrogen precooler is provided with a low-temperature nitrogen purity probe.
The regenerated gas induced draft fan, the low-temperature nitrogen temperature probe, the nitrogen temperature regulating valve, the waste gas emission induced draft fan, the waste gas purity probe and the low-temperature nitrogen purity probe are respectively and electrically connected with the PLC control module.
The utility model provides a nitrogen refrigerant low-temperature quick-freezing refrigerating system, which has the following beneficial effects:
1. according to the utility model, nitrogen is directly used as a refrigerant, and refrigerants such as freon or liquid ammonia are not required to be added, so that the damage of freon to an atmospheric ozone layer is reduced;
2. the whole set of equipment is simple in configuration, low in operation energy consumption and safe and convenient to operate;
3. the utility model directly reduces the nitrogen temperature through compression nitrogen expansion refrigeration, and has high cooling speed and high freezing speed;
4. the quick-freezing process is direct contact type heat exchange, so that the cold energy loss in the heat exchange process is reduced, and the energy consumption loss is reduced;
5. the low-temperature quick-freezing refrigeration technology of the utility model is suitable for the requirements of all large and medium-sized food quick-freezing industries in China at present, and can greatly improve the refrigeration speed. The equipment configuration is simple, the investment cost is low, the operation energy consumption is low, chemical raw materials such as freon liquid ammonia and the like are not needed to be used as refrigerants, and the pollution-free process is green.
Drawings
FIG. 1 is a schematic diagram of a nitrogen refrigerant low-temperature quick-freezing refrigeration system in the utility model;
in the figure: 1. the system comprises a nitrogen filter, a nitrogen compressor, a regenerated gas induced draft fan, a nitrogen purification system, a low-temperature cold box, a nitrogen precooler, a turbine expander, a tunnel type low-temperature quick freezer, a low-temperature nitrogen temperature probe, a nitrogen temperature regulating valve, an exhaust emission induced draft fan, a PLC control module, a low-temperature nitrogen purity probe, a waste gas purity probe, a nitrogen purity regulating valve, a low-temperature nitrogen conveying pipe, a heat exchange nitrogen conveying pipe, a waste gas discharging pipe first branch, a waste gas discharging pipe second branch and a nitrogen regenerated gas discharging pipe.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, the embodiment provides a nitrogen refrigerant low-temperature quick-freezing refrigerating system, which comprises a nitrogen filter 1, a nitrogen compressor 2, a nitrogen purification system 4 and a low-temperature cold box 5 which are sequentially connected through pipelines, wherein a nitrogen precooler 6 and a turbo expander 7 which are connected through pipelines are arranged in the low-temperature cold box 5, the nitrogen precooler 6 is connected with the nitrogen purification system 4 through pipelines, and the turbo expander 7 conveys nitrogen which is cooled to below 120 ℃ to a tunnel type low-temperature quick-freezing machine 8 through a low-temperature nitrogen conveying pipe 16. The nitrogen purification system 4 is required to dry, cool and purify the nitrogen, and the dew point of the treated nitrogen is below minus 60 ℃. The tunnel type low-temperature instant freezer 8 adopts a conveyor belt to convey food to be processed, and can continuously quick freeze the food to be processed for 24 hours.
Wherein, be connected with heat transfer back nitrogen gas conveyer pipe 17 between tunnel type low temperature frozen machine 8 and the nitrogen gas precooler 6.
The nitrogen precooler 6 is connected with an exhaust gas discharge pipe 18, the exhaust gas discharge pipe 18 is divided into two branches, a first branch 19 of the exhaust gas discharge pipe is connected with the nitrogen purification system 4, and a second branch 20 of the exhaust gas discharge pipe is connected with a pipeline connecting the nitrogen filter 1 and the nitrogen compressor 2. The nitrogen precooler can recycle the cold energy in the low-temperature waste gas returned by the tunnel type low-temperature instant freezer 8, thereby reducing energy loss.
Wherein, nitrogen purification system 4 is connected with nitrogen gas regeneration gas blow-down pipe 21, is equipped with regeneration gas draught fan 3 on the regeneration gas blow-down pipe.
Wherein, the low-temperature nitrogen delivery pipe 16 is provided with a low-temperature nitrogen temperature probe 9 and a nitrogen temperature regulating valve 10. A low temperature nitrogen temperature probe 9 and a nitrogen temperature regulating valve 10. The temperature signal fed back by the low-temperature nitrogen temperature probe 9 can be acquired through the PLC control module 12 to adjust the nitrogen temperature adjusting valve 10, so that the aim of adjusting the temperature of low-temperature nitrogen is fulfilled.
Wherein, be equipped with the waste gas and issue the draught fan on the exhaust gas discharge pipe 18, be equipped with waste gas purity probe 14 on the exhaust gas discharge pipe second branch road 20.
Wherein, a low-temperature nitrogen purity probe 13 is arranged on a pipeline connecting the nitrogen purification system 4 and the nitrogen precooler 6.
Wherein, regeneration gas draught fan 3, low temperature nitrogen gas temperature probe 9, nitrogen gas temperature regulating valve 10, waste gas issue draught fan, waste gas purity probe 14 and low temperature nitrogen gas purity probe 13 are connected with PLC control module 12 electricity respectively. 2 low-temperature nitrogen purity probes 13 and a nitrogen purity regulating valve 15 are matched in the system. The purity signal fed back by the low-temperature nitrogen purity probe 13 can be collected through the PLC control module 12 to adjust the nitrogen purity adjusting valve 15, so that the aim of adjusting the purity of the low-temperature nitrogen is fulfilled.
The working process comprises the following steps:
the nitrogen filter 1 prevents external impurities from entering the system, a nitrogen storage bottle is used for being in butt joint with the nitrogen storage bottle, a valve is opened to introduce nitrogen into the system, then the nitrogen is mixed with the reflux part of waste gas and then enters the nitrogen compressor 2, after the nitrogen is compressed to a certain pressure, the nitrogen is subjected to drying and purifying treatment through the nitrogen purifying system 4, and then enters the low-temperature cold box 5, purified nitrogen firstly enters the nitrogen precooler 6 in the low-temperature cold box 5, exchanges heat with the reflux low-temperature waste gas and is cooled, then enters the turbine expander 7 for turbine expansion and cooling, the nitrogen temperature can be directly reduced to below-120 ℃, and then is conveyed into the tunnel type low-temperature instant freezer 8 through a pipeline to quickly freeze food. The low-temperature nitrogen in the tunnel type instant freezer returns to the low-temperature cold box 5 after being subjected to direct contact heat exchange with food, enters the nitrogen precooler 6 to be subjected to heat exchange and reheating with forward-flow hot nitrogen, is led out of the low-temperature cold box 5 through the waste gas discharge induced draft fan 11, is partially sent into the nitrogen purification system 4 to be used as regenerated gas, and is led out to be emptied through the regenerated gas induced draft fan 3. The rest waste gas enters the inlet of the nitrogen compressor 2 to participate in the circulation refrigeration. The scheme is characterized in that the medium-low temperature nitrogen temperature probe 9 is used for detecting the temperature of nitrogen entering the tunnel type instant freezer, and the nitrogen temperature regulating valve 10 is used for regulating the temperature of low temperature nitrogen according to the requirements of customers. The scheme is characterized in that the low-temperature nitrogen purity probe 13 is used for detecting the purity of nitrogen entering the tunnel type instant freezer, and the nitrogen purity regulating valve 15 is used for regulating the purity of low-temperature nitrogen according to the requirements of customers. The whole set of low-temperature quick-freezing refrigerating system is controlled by a PLC centralized control system.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A nitrogen refrigerant low temperature quick-freezing refrigerating system is characterized in that: the low-temperature air conditioner comprises a nitrogen filter, a nitrogen compressor, a nitrogen purification system and a low-temperature cold box which are sequentially connected through pipelines, wherein a nitrogen precooler and a turbine expander which are connected through pipelines are arranged in the low-temperature cold box, the nitrogen precooler is connected with the nitrogen purification system through the pipelines, and the turbine expander conveys nitrogen which is cooled to be below 120 ℃ to a tunnel type low-temperature instant freezer through a low-temperature nitrogen conveying pipe.
2. The nitrogen refrigerant low-temperature quick-freezing refrigeration system according to claim 1, wherein: and a nitrogen conveying pipe after heat exchange is connected between the tunnel type low-temperature instant freezer and the nitrogen precooler.
3. The nitrogen refrigerant low-temperature quick-freezing refrigeration system according to claim 1, wherein: the nitrogen precooler is connected with an exhaust gas discharge pipe, the exhaust gas discharge pipe is divided into two branches, a first branch of the exhaust gas discharge pipe is connected with the nitrogen purification system, and a second branch of the exhaust gas discharge pipe is connected with a pipeline connected with the nitrogen filter and the nitrogen compressor.
4. The nitrogen refrigerant low-temperature quick-freezing refrigeration system according to claim 3, wherein: the nitrogen purification system is connected with a nitrogen regeneration gas blow-down pipe, and a regeneration gas induced draft fan is arranged on the regeneration gas blow-down pipe.
5. The nitrogen refrigerant low-temperature quick-freezing refrigeration system according to claim 4, wherein: the low-temperature nitrogen conveying pipe is provided with a low-temperature nitrogen temperature probe and a nitrogen temperature regulating valve.
6. The nitrogen refrigerant low-temperature quick-freezing refrigeration system according to claim 5, wherein: the waste gas discharge pipe is provided with a waste gas discharge induced draft fan, and the second branch of the waste gas discharge pipe is provided with a waste gas purity probe.
7. The nitrogen refrigerant low-temperature quick-freezing refrigeration system according to claim 5, wherein: and a low-temperature nitrogen purity probe is arranged on a pipeline connecting the nitrogen purification system and the nitrogen precooler.
8. The nitrogen refrigerant low-temperature quick-freezing refrigeration system according to claim 7, wherein: the regenerated gas induced draft fan, the low-temperature nitrogen temperature probe, the nitrogen temperature regulating valve, the waste gas distributing induced draft fan, the waste gas purity probe and the low-temperature nitrogen purity probe are respectively and electrically connected with the PLC control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320102216.3U CN219346880U (en) | 2023-02-02 | 2023-02-02 | Nitrogen refrigerant low-temperature quick-freezing refrigerating system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320102216.3U CN219346880U (en) | 2023-02-02 | 2023-02-02 | Nitrogen refrigerant low-temperature quick-freezing refrigerating system |
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| CN219346880U true CN219346880U (en) | 2023-07-14 |
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| CN202320102216.3U Active CN219346880U (en) | 2023-02-02 | 2023-02-02 | Nitrogen refrigerant low-temperature quick-freezing refrigerating system |
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- 2023-02-02 CN CN202320102216.3U patent/CN219346880U/en active Active
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