CN115218577A - Quick-freezing method for gradually utilizing liquid nitrogen cold energy - Google Patents
Quick-freezing method for gradually utilizing liquid nitrogen cold energy Download PDFInfo
- Publication number
- CN115218577A CN115218577A CN202210887909.8A CN202210887909A CN115218577A CN 115218577 A CN115218577 A CN 115218577A CN 202210887909 A CN202210887909 A CN 202210887909A CN 115218577 A CN115218577 A CN 115218577A
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- CN
- China
- Prior art keywords
- quick
- freezing
- liquid nitrogen
- cavity
- nitrogen
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Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 169
- 238000007710 freezing Methods 0.000 title claims abstract description 144
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 83
- 239000007788 liquid Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000002826 coolant Substances 0.000 claims abstract description 26
- 230000008014 freezing Effects 0.000 claims abstract description 22
- 238000005057 refrigeration Methods 0.000 claims abstract description 18
- 238000005507 spraying Methods 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 13
- 238000004321 preservation Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000005187 foaming Methods 0.000 description 8
- 239000011232 storage material Substances 0.000 description 5
- 239000002699 waste material Substances 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 235000006025 Durio zibethinus Nutrition 0.000 description 2
- 240000000716 Durio zibethinus Species 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
- F25D3/102—Stationary cabinets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/006—General constructional features for mounting refrigerating machinery components
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
Abstract
The invention belongs to the field of cold chain equipment, and discloses a quick freezing method for utilizing liquid nitrogen cold energy step by step.A liquid nitrogen acts on an article in a first quick freezing cavity through a liquid nitrogen spraying module, is gasified to generate nitrogen, the nitrogen cools a coolant through a coolant refrigerating module, and the nitrogen discharged by the coolant refrigerating module enters a third quick freezing cavity to refrigerate the article in the third quick freezing cavity; at the same time, the heat exchanger refrigerates the articles in the second-speed freezing cavity; and the articles in any one of the first quick-freezing cavity, the second quick-freezing cavity and the third quick-freezing cavity are sequentially subjected to contact refrigeration with nitrogen, heat exchange refrigeration by adopting a heat exchanger and liquid nitrogen refrigeration to finish quick-freezing operation. The method can fully utilize the cold energy of the liquid nitrogen, and realize quick and energy-saving quick freezing of objects difficult to quick freeze.
Description
Technical Field
The invention relates to the field of cold chain equipment, in particular to a quick-freezing method for gradually utilizing liquid nitrogen cold.
Background
ZL201822178843.7 discloses a four-door liquid nitrogen quick-freeze cabinet, including the casing, be equipped with first freezing chamber, second freezing chamber, third freezing chamber, fourth freezing chamber, first freezing door, second freezing door, third freezing door, fourth freezing door, first blast pipe, second blast pipe, third blast pipe, fourth blast pipe, first foaming heated board, second foaming heat preservation, third foaming heated board, fourth foaming heated board and low temperature resistant sealing strip on the casing, the thickness of first foaming heated board, the thickness of second foaming heated board, the thickness of third foaming heated board and the thickness of fourth foaming heated board all are 150mm ~ 200mm.
In the equipment, precooling by using waste nitrogen gas is a very good design, but in the process of quick freezing, people find that large amount of liquid nitrogen is needed to be adopted for quick freezing of objects which are difficult to be completely frozen, a large amount of waste nitrogen gas is generated instantly, and the problems of low heat exchange efficiency and low heat exchange speed exist when precooling operation is carried out on the waste nitrogen gas.
The performance feedback requirements of overseas users on our equipment are: the amount of liquid nitrogen used cannot be further reduced.
Therefore, the problem to be solved by the present invention is: how to realize the full utilization of the energy of the liquid nitrogen.
Disclosure of Invention
The invention aims to provide a quick-freezing method for gradually utilizing the cold energy of liquid nitrogen, which can fully utilize the cold energy of the liquid nitrogen and realize quick and energy-saving quick freezing of objects difficult to quick-freeze.
In order to achieve the purpose, the invention provides the following technical scheme: a quick-freezing method for utilizing liquid nitrogen cold energy step by step relates to at least 3 quick-freezing cavities, wherein the 3 quick-freezing cavities are respectively a first quick-freezing cavity, a second quick-freezing cavity and a third quick-freezing cavity, the method also relates to a coolant storage module, a circulating pump, a heat exchanger and a coolant refrigerating module, the coolant storage module, the circulating pump and the heat exchanger form a circulation, and liquid nitrogen spraying modules and the heat exchanger are arranged in the first quick-freezing cavity, the second quick-freezing cavity and the third quick-freezing cavity;
the method specifically comprises the following steps:
the liquid nitrogen acts on the articles in the first quick-freezing cavity through the liquid nitrogen spraying module and is gasified to generate nitrogen, the nitrogen cools the cold storage agent through the cold storage agent refrigerating module, and the nitrogen discharged by the cold storage agent refrigerating module enters the third quick-freezing cavity to refrigerate the articles in the third quick-freezing cavity; at the same time, the heat exchanger refrigerates the articles in the second-speed freezing cavity;
and the articles in any one of the first quick-freezing cavity, the second quick-freezing cavity and the third quick-freezing cavity are sequentially subjected to contact refrigeration with nitrogen, heat exchange refrigeration by adopting a heat exchanger and liquid nitrogen refrigeration to finish quick-freezing operation.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the first quick-freezing cavity, the second quick-freezing cavity and the third quick-freezing cavity, which respectively carry out liquid nitrogen refrigeration, heat exchanger refrigeration and precooling operation at the same time, firstly, high-grade cold energy is absorbed by gasified nitrogen through the coolant, and then, low-grade nitrogen and objects are directly subjected to heat exchange, thus the consumption of liquid nitrogen can be obviously reduced.
Drawings
FIG. 1 is a schematic view of the structure of embodiment 1;
FIG. 2 is a flow chart of the pipeline of example 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A quick-freezing method for gradually utilizing cold energy of liquid nitrogen refers to figures 1 and 2, and relates to at least 3 quick-freezing cavities 1,3 quick-freezing cavities 1 are respectively a first quick-freezing cavity 1, a second quick-freezing cavity 1 and a third quick-freezing cavity 1, a coolant storage module 3, a circulating pump 7, a heat exchanger 6 and a coolant refrigerating module 8, wherein the coolant storage module 3, the circulating pump 7 and the heat exchanger 6 form a circulation, and liquid nitrogen spraying modules 2 and the heat exchanger 6 are arranged in the first quick-freezing cavity 1, the second quick-freezing cavity 1 and the third quick-freezing cavity 1; each quick-freezing chamber 1 is provided with an air supply pipeline 4 and an air exhaust pipeline 5; the exhaust duct 5 has two exhaust paths, wherein one exhaust path is connected to a gas inlet of the coolant refrigeration module 8, and the other exhaust path is the atmosphere; a first valve 9 and a second valve 10 are arranged on the two discharge paths; the gas supply pipeline 4 is communicated with a gas outlet of the cold storage agent refrigeration module 8.
The method specifically comprises the following steps:
liquid nitrogen acts on the articles in the first quick-freezing cavity 1 through the liquid nitrogen spraying module 2, nitrogen is generated through gasification, the nitrogen cools the coolant through the coolant refrigerating module 8, and the nitrogen discharged from the coolant refrigerating module 8 enters the third quick-freezing cavity 1 to refrigerate the articles in the third quick-freezing cavity 1; at the same time, the heat exchanger 6 refrigerates the articles in the second quick-freezing chamber 1;
the quick-freezing operation is completed by sequentially carrying out three steps of contact refrigeration with nitrogen, heat exchange refrigeration by adopting a heat exchanger 6 and liquid nitrogen refrigeration on articles in any one of the first quick-freezing chamber 1, the second quick-freezing chamber 1 and the third quick-freezing chamber 1.
The first quick-freezing chamber 1, the second quick-freezing chamber 1 and the third quick-freezing chamber 1 are completely described as follows:
a first time period: the first quick-freezing chamber 1 adopts liquid nitrogen for quick-freezing refrigeration, namely liquid nitrogen is directly sprayed on an article; the second quick-freezing chamber 1 is refrigerated by the heat exchanger 6, namely, the gas in the second quick-freezing chamber 1 and the heat exchanger 6 are subjected to heat exchange to cool the gas, the gas refrigerates the articles in the second quick-freezing chamber 1, the third quick-freezing chamber 1 is precooled by nitrogen absorbed by the coolant, and the nitrogen is discharged to the atmosphere through the third quick-freezing chamber 1.
A second time period: precooling a first quick-freezing chamber 1, refrigerating a second quick-freezing chamber 1 by adopting liquid nitrogen quick freezing, and refrigerating a third quick-freezing chamber 1 by adopting a heat exchanger 6;
a third time period: the first quick-freezing chamber 1 is refrigerated by a heat exchanger 6, the second quick-freezing chamber 1 is precooled, and the third quick-freezing chamber 1 is refrigerated by liquid nitrogen quick-freezing;
the first time period, the second time period and the third time period are a complete cycle.
Through the three steps, verification is carried out:
the verification object is: the Thailand durian is verified in the place of production;
by adopting the quick-freezing method of the embodiment, the time spent in the first time period, the second time period and the third time period is about 120min completely; the four-door self-precooling liquid nitrogen cabinet disclosed by CN201822178658.8 is adopted, and the whole time is about 120min; the complete time of the single-door liquid nitrogen instant freezer is about 100min;
under the condition that the same target quick-freezing temperature and the total amount of durian are equal, the liquid nitrogen consumed by adopting the quick-freezing method of the embodiment is about 70% of the liquid nitrogen consumed by a single-door liquid nitrogen quick-freezing machine; the four-door self-precooling liquid nitrogen cabinet described in CN201822178658.8 is about 90% of the liquid nitrogen consumption of a single-door liquid nitrogen instant freezer.
In practical application, the number of the quick-freezing chambers is not less than 3, and at least one of the first quick-freezing chamber 1, the second quick-freezing chamber 1 and the third quick-freezing chamber 1 is not less than 2. The number of the quick-freezing cavities 1 can be 6, 9, 12 and the like.
Preferably, forced convection equipment 11 is arranged in the first quick-freezing chamber 1, the second quick-freezing chamber 1 and the third quick-freezing chamber 1. The forced convection equipment 11 is a fan which can play a role in any one of three processes of waste nitrogen precooling, heat exchanger 6 quick freezing and liquid nitrogen quick freezing; in the pre-cooling stage, a fan can be used for carrying out rapid contact heat exchange on the nitrogen and the articles; in the quick-freezing stage of the heat exchanger 6, the quick-freezing cavity 1 is in a closed state, nitrogen is not supplemented inwards or exhausted outwards, the fan is used for promoting the gas in the quick-freezing cavity 1 to perform quick heat exchange with the heat exchanger 6, and the gas in the quick-freezing cavity 1 performs contact heat exchange on articles; in the liquid nitrogen quick-freezing stage, the fan is used for promoting the diffusion of liquid nitrogen particles, so that the liquid nitrogen particles are in more thorough contact with objects, and the gasification of the liquid nitrogen is promoted.
More preferably, the liquid nitrogen spraying module 2 and the heat exchanger 6 are both provided with a forced convection device 11.
In order to increase the heat exchange speed, the heat exchanger 6 and the coolant refrigerating module 8 are both heat exchangers 6 which adopt heat pipes for heat exchange. The heat pipe heat exchanger 6 is generally composed of the following components: one end of the heat pipe is contacted with the coolant, and the other end of the heat pipe is contacted with the nitrogen, so that rapid heat exchange is realized; but the present embodiment does not exclude other conventional types of heat exchangers 6, such as tube and strip heat exchangers 6, etc.
In the present embodiment, the liquid inlet of the heat exchanger 6 is provided with a third valve 12; and a fourth valve 13 is arranged on the gas supply pipeline 4.
The working process of each valve is as follows:
the first quick-freezing chamber 1 is in a liquid nitrogen quick-freezing stage, and at the moment, a first valve 9 is opened, a second valve 10, a third valve 12 and a fourth valve 13 are closed;
the second quick-freezing chamber 1 is in a cold storage agent quick-freezing stage, the first valve 9, the second valve 10 and the fourth valve 13 are closed at the moment, and the third valve 12 is opened;
the third quick-freezing chamber 1 is in a precooling stage, the second valve 10 and the fourth valve 13 are opened at the moment, and the first valve 9 and the third valve 12 are closed.
Preferably, fans 14 are arranged in the air supply pipeline 4 and the air exhaust pipeline 5, and a sealing door 15 is arranged in the quick-freezing chamber 1 in a matched manner; the quick-freezing chamber 1 is a quick-freezing chamber 1 with a heat preservation structure.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof.
Claims (9)
1. A quick-freezing method for utilizing liquid nitrogen cold energy step by step relates to at least 3 quick-freezing cavities, wherein the 3 quick-freezing cavities are respectively a first quick-freezing cavity, a second quick-freezing cavity and a third quick-freezing cavity, and is characterized in that the method also relates to a coolant storage module, a circulating pump, a heat exchanger and a coolant refrigerating module, wherein the coolant storage module, the circulating pump and the heat exchanger form a circulation, and liquid nitrogen spraying modules and the heat exchanger are arranged in the first quick-freezing cavity, the second quick-freezing cavity and the third quick-freezing cavity;
the method specifically comprises the following steps:
liquid nitrogen acts on the articles in the first quick-freezing cavity through the liquid nitrogen spraying module and is gasified to generate nitrogen, the nitrogen cools the coolant through the coolant refrigerating module, and the nitrogen discharged by the coolant refrigerating module enters the third quick-freezing cavity to refrigerate the articles in the third quick-freezing cavity; at the same time, the heat exchanger refrigerates the articles in the second-speed freezing cavity;
and the articles in any one of the first quick-freezing cavity, the second quick-freezing cavity and the third quick-freezing cavity are sequentially subjected to contact refrigeration with nitrogen, heat exchange refrigeration by adopting a heat exchanger and liquid nitrogen refrigeration to finish quick-freezing operation.
2. The quick-freezing method for gradually utilizing cold energy of liquid nitrogen as claimed in claim 1, wherein the number of the quick-freezing cavities is not less than 3, and at least one of the first quick-freezing cavity, the second quick-freezing cavity and the third quick-freezing cavity is not less than 2.
3. The quick-freezing method for gradually utilizing the cold energy of the liquid nitrogen as claimed in claim 1, wherein each quick-freezing chamber is provided with an air supply pipeline and an air exhaust pipeline; the exhaust pipeline is provided with two exhaust paths, wherein one exhaust path is connected to a gas inlet of the coolant refrigeration module, and the other exhaust path is the atmosphere; a first valve and a second valve are arranged on the two discharge paths; and the gas supply pipeline is communicated with a gas outlet of the coolant refrigerating module.
4. The quick-freezing method for gradually utilizing cold energy of liquid nitrogen as claimed in claim 1, wherein forced convection devices are arranged in the first quick-freezing cavity, the second quick-freezing cavity and the third quick-freezing cavity.
5. The quick-freezing method for gradually utilizing cold energy of liquid nitrogen according to claim 1, wherein the liquid nitrogen spraying module and the heat exchanger are both provided with a forced convection device.
6. The quick-freezing method for gradually utilizing the cold energy of the liquid nitrogen as claimed in claim 1, wherein the heat exchanger and the coolant refrigerating module are heat exchangers which exchange heat by adopting heat pipes.
7. The quick-freezing method for gradually utilizing cold energy of liquid nitrogen as claimed in claim 3, wherein a third valve is arranged at a liquid inlet of the heat exchanger; and a fourth valve is arranged on the gas supply pipeline.
8. The quick-freezing method by utilizing the cold energy of the liquid nitrogen stage by stage according to claim 3, characterized in that fans are arranged in the air supply pipeline and the air exhaust pipeline.
9. The quick-freezing method for gradually utilizing cold energy of liquid nitrogen as claimed in claim 1, wherein a sealing door is arranged in the quick-freezing chamber; the quick-freezing chamber is a quick-freezing chamber with a heat preservation structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210887909.8A CN115218577B (en) | 2022-07-26 | 2022-07-26 | Quick freezing method for gradually utilizing liquid nitrogen cold energy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210887909.8A CN115218577B (en) | 2022-07-26 | 2022-07-26 | Quick freezing method for gradually utilizing liquid nitrogen cold energy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115218577A true CN115218577A (en) | 2022-10-21 |
| CN115218577B CN115218577B (en) | 2024-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210887909.8A Active CN115218577B (en) | 2022-07-26 | 2022-07-26 | Quick freezing method for gradually utilizing liquid nitrogen cold energy |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206094715U (en) * | 2016-08-31 | 2017-04-12 | 梁玮达 | Planar net takes frozen machine |
| CN209355545U (en) * | 2018-12-24 | 2019-09-06 | 广州极速制冷设备有限公司 | A kind of four liquid nitrogen flash freezer cabinets |
| CN209355543U (en) * | 2018-12-24 | 2019-09-06 | 广州极速制冷设备有限公司 | A kind of four are pre-chilled liquid nitrogen cabinet certainly |
| CN114111215A (en) * | 2022-01-25 | 2022-03-01 | 杭州制氧机集团股份有限公司 | Device for preparing liquid hydrogen by using low-temperature hydrogen-containing mixed gas and using method |
| CN215951852U (en) * | 2020-12-15 | 2022-03-04 | 科威嘉尼（江苏）制冷设备有限公司 | Tunnel type liquid nitrogen circulation instant freezer |
-
2022
- 2022-07-26 CN CN202210887909.8A patent/CN115218577B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206094715U (en) * | 2016-08-31 | 2017-04-12 | 梁玮达 | Planar net takes frozen machine |
| CN209355545U (en) * | 2018-12-24 | 2019-09-06 | 广州极速制冷设备有限公司 | A kind of four liquid nitrogen flash freezer cabinets |
| CN209355543U (en) * | 2018-12-24 | 2019-09-06 | 广州极速制冷设备有限公司 | A kind of four are pre-chilled liquid nitrogen cabinet certainly |
| CN215951852U (en) * | 2020-12-15 | 2022-03-04 | 科威嘉尼（江苏）制冷设备有限公司 | Tunnel type liquid nitrogen circulation instant freezer |
| CN114111215A (en) * | 2022-01-25 | 2022-03-01 | 杭州制氧机集团股份有限公司 | Device for preparing liquid hydrogen by using low-temperature hydrogen-containing mixed gas and using method |
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| Publication number | Publication date |
|---|---|
| CN115218577B (en) | 2024-01-19 |
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