CN114791206A - Energy-saving fruit and vegetable freeze-drying process taking carbon dioxide as refrigerant - Google Patents
Energy-saving fruit and vegetable freeze-drying process taking carbon dioxide as refrigerant Download PDFInfo
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- CN114791206A CN114791206A CN202110098664.6A CN202110098664A CN114791206A CN 114791206 A CN114791206 A CN 114791206A CN 202110098664 A CN202110098664 A CN 202110098664A CN 114791206 A CN114791206 A CN 114791206A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
- F26B5/06—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum the process involving freezing
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23N—MACHINES OR APPARATUS FOR TREATING HARVESTED FRUIT, VEGETABLES OR FLOWER BULBS IN BULK, NOT OTHERWISE PROVIDED FOR; PEELING VEGETABLES OR FRUIT IN BULK; APPARATUS FOR PREPARING ANIMAL FEEDING- STUFFS
- A23N12/00—Machines for cleaning, blanching, drying or roasting fruits or vegetables, e.g. coffee, cocoa, nuts
- A23N12/08—Machines for cleaning, blanching, drying or roasting fruits or vegetables, e.g. coffee, cocoa, nuts for drying or roasting
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
- F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B1/00—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Food Science & Technology (AREA)
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- Drying Of Solid Materials (AREA)
Abstract
The invention discloses an energy-saving freeze-drying process for fruits and vegetables by taking carbon dioxide as a refrigerant, which comprises the following steps of cleaning, pretreating, quickly freezing and then dishing fruit and vegetable raw materials, placing the fruit and vegetable raw materials in a vacuum freeze-drying machine for vacuum freeze-drying, simultaneously keeping the partial pressure of water vapor in a vacuum freeze-drying system at a lower level, accelerating the sublimation speed of water in the fruit and vegetable raw materials, absorbing heat of carbon dioxide fluid passing through a carbon dioxide cooling well, raising the temperature of the carbon dioxide fluid, and converting the carbon dioxide fluid into high-temperature and high-pressure carbon dioxide fluid under the action of a compressor. According to the energy-saving freeze-drying process for fruits and vegetables by taking carbon dioxide as the refrigerant, the carbon dioxide is adopted as the refrigerant, the temperature of water vapor captured by a cold well is low, the speed of removing the water vapor in the system is high, the partial pressure of the water vapor in the system is low, the vacuum freeze-drying speed can be effectively accelerated, the energy recovery rate is high, the energy utilization efficiency of the system is effectively improved, and the freeze-drying speed is accelerated, the energy utilization efficiency is improved, and the unit energy consumption is reduced.
Description
Technical Field
The invention belongs to the field of food processing, and particularly relates to an energy-saving fruit and vegetable freeze-drying process taking carbon dioxide as a refrigerant.
Background
The vacuum freeze drying technology is a fruit and vegetable drying technology which is gradually and widely used at present, and in the traditional vacuum freeze drying equipment and production process, the adopted refrigerant is basically Freon. The Freon cooling system has mature technology, relatively low manufacturing cost and relatively easy maintenance, and is widely adopted. But Freon has stable chemical properties, has no flammability and toxicity, and is widely used in the fields of household appliances, foamed plastics, daily chemicals, automobiles, fire-fighting equipment and the like. The freon cooler inevitably has various to reveal, and the freon of revealing can destroy the atmospheric ozone layer, has restricted the use in the global range. China promises that Freon production is frozen in 2016 (2015), and then is eliminated year by year, and production and consumption are reduced to zero in 2040.
Carbon dioxide has been used as a refrigerant earlier than freon, but it is gradually replaced by freon because of its high working pressure, high equipment manufacturing cost, and relatively low safety. In the last decade, carbon dioxide has been removed from view as a refrigerant as the negative environmental impact of freon has been eliminated.
Carbon dioxide has several key differences from other common refrigerants, including: high operating pressure, narrow operating temperature range, higher triple point pressure (-69.9 others, 75.1psia), lower temperature at critical point (87.9 endpoint).
From an initial cost perspective, the cost of a carbon dioxide system is 10% to 20% higher than conventional freon. However, as manufacturers begin to market the full range of carbon dioxide standard products, the cost will be lower and lower, becoming very competitive with the traditional freon system, ammonia system. For applications where the evaporator temperature is below-40 f, the system becomes cheaper.
Compared with the traditional Freon refrigerant vacuum freeze-drying process, the energy-saving fruit and vegetable vacuum freeze-drying method using carbon dioxide as the refrigerant has the following advantages: firstly, carbon dioxide replaces freon, so that freon is not leaked, the environment is not polluted, and the ozone layer is not damaged; secondly, the temperature of a carbon dioxide cold well in the system is lower than that of a Freon cold well, and the cooling speed of water vapor generated by drying is higher, so that the drying speed is favorably accelerated; then, the carbon dioxide energy recovery system has large working temperature difference, high energy recovery rate and high temperature of recovered hot water, and can be directly used for pretreatment of fruit and vegetable raw materials; finally, the manufacturing cost of the carbon dioxide refrigerant system is slightly higher than that of the traditional Freon system, but the operation cost is similar, the energy recovery rate is high, and the economic benefit is better.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an energy-saving fruit and vegetable freeze-drying process taking carbon dioxide as a refrigerant, and on one hand, the carbon dioxide is adopted to replace Freon as the refrigerant in the fruit and vegetable freeze-drying process, no Freon is leaked, the environment cannot be polluted, the aggravation of greenhouse effect caused by ozone layer damage is avoided, meanwhile, the carbon dioxide is adopted as the refrigerant, the temperature of a cold well is lower than that of a Freon cold well, the cooling speed of water vapor generated by drying is higher, and the drying speed is higher; the carbon dioxide energy recovery system has high energy recovery efficiency, the temperature of the recovered hot water is high, and the system can be directly used for pretreatment of fruit and vegetable raw materials.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: an energy-saving freeze-drying process for fruits and vegetables by taking carbon dioxide as a refrigerant comprises the following steps:
s1: selecting, pretreating and quickly freezing fresh fruits and vegetables for later use;
s2: placing quick-frozen fruit and vegetable materials into a tray with a thickness of 2-5cm, and vacuum freeze-drying in a vacuum freeze-drying machine at 40-60 deg.C, vacuum degree of 5-120Pa, and cooling well temperature of-35-40 deg.C for 12-36 hr;
s3: water vapor generated in the freeze-drying process is conveyed to a carbon dioxide cooling well in a vacuum system by a vacuum pump to be quickly frozen into frost, the partial pressure of the water vapor in the vacuum freeze-drying system is kept at a lower level, and the sublimation speed of water in the fruit and vegetable raw materials is accelerated;
s4: the carbon dioxide fluid passing through the carbon dioxide cooling well absorbs heat, the temperature rises, the carbon dioxide fluid is changed into high-temperature and high-pressure carbon dioxide fluid under the action of a compressor, the heat is transferred to cold water at the other end of the heat exchanger through the heat exchanger, the cold water absorbs heat and is changed into hot water at 85-98 ℃, and the high-temperature and high-pressure carbon dioxide fluid releases heat and then is changed into liquid carbon dioxide below 30 ℃;
s5: the liquid carbon dioxide is decompressed by an expansion valve to absorb a large amount of heat, the heat is rapidly reduced to below-40 ℃, the heat of the water vapor is absorbed by the heat exchange of a cold well, the temperature is raised to above-10 ℃, and the liquid carbon dioxide returns to a compressor for recycling;
s6: and collecting the freeze-dried fruit and vegetable products, and packaging and inspecting to obtain finished products.
Preferably, in the step S3, the water vapor generated during the freeze-drying process is pumped by a vacuum pump to a carbon dioxide cold well in the vacuum system to be frozen into the frost rapidly, and the cold well needs to be pre-cooled to-35 to-40 ℃ to ensure that a large amount of water vapor generated during the initial freeze-drying process can be frozen into the frost rapidly.
Preferably, in the step S4, the high-temperature and high-pressure carbon dioxide fluid from the compressor is subjected to heat exchange, and the temperature of the hot water can reach 85 to 98 ℃ as required, and the hot water is directly used for enzyme deactivation and disinfection of pretreatment of fruits and vegetables.
Preferably, in step S5, the flow rate of the carbon dioxide is controlled to ensure that the temperature of the carbon dioxide flowing back to the compressor for recycling is not lower than-10 ℃, so as to meet the requirement of normal operation of the compressor.
(III) advantageous effects
The invention provides an energy-saving fruit and vegetable freeze-drying process taking carbon dioxide as a refrigerant, which has the following beneficial effects:
(1) the energy-saving freeze-drying process for the fruits and vegetables with the carbon dioxide as the refrigerant adopts the carbon dioxide to replace Freon as the refrigerant in the freeze-drying process of the fruits and vegetables, has no Freon leakage, does not pollute the environment, and avoids aggravation of greenhouse effect caused by ozone layer damage;
(2) the fruit and vegetable energy-saving freeze-drying process with the carbon dioxide as the refrigerant adopts the carbon dioxide as the refrigerant, the temperature of the cold well is lower than that of a Freon cold well, the cooling speed of water vapor generated by drying is higher, and the drying speed is higher; the carbon dioxide energy recovery system has high energy recovery efficiency, the temperature of the recovered hot water is high, and the system can be directly used for pretreatment of fruit and vegetable raw materials.
Drawings
FIG. 1 is a process flow diagram of the energy-saving freeze-drying process of fruits and vegetables using carbon dioxide as a refrigerant.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The first embodiment is as follows:
selecting fresh carrot fruit, removing damaged, rotten and mildewed parts, cleaning, peeling, cutting into uniform slices with thickness of 3mm, blanching with hot water at 90 deg.C for 1min, immediately cooling in cold water, freezing in-40 deg.C refrigerator for more than 5hr, uniformly dishing the quick-frozen carrot slices with thickness of 3cm, freeze-drying in vacuum freeze-drying machine at sublimation stage tray heating temperature of 40 deg.C, initial vacuum degree of 100Pa, final vacuum degree of 5Pa, analysis stage tray heating temperature of 45 deg.C, and freeze-drying time of 18 hr.
The parameters of the carbon dioxide cold well and the energy recovery system are as follows: the temperature of the carbon dioxide cold well is-40 ℃, the outlet end of the carbon dioxide compressor is 116 ℃, the outlet end of the carbon dioxide compressor is 29 ℃, the inlet end of the cooling water is 25 ℃, the outlet end of the carbon dioxide compressor is 85 ℃, and the inlet end of the carbon dioxide compressor is-9 ℃.
And (3) returning the 85 ℃ hot water to the carrot pretreatment end through a heat-insulating pipeline for recycling, packaging the freeze-dried carrots by adopting composite aluminum foil bags, and sampling and analyzing to obtain the carrot freeze-dried carrot with the water content lower than 5%.
Example two:
selecting fresh chives, removing yellow leaves and rotten leaves, cleaning, cutting into 2cm small sections, blanching with 90 ℃ hot water for 45s, immediately spraying cold water to cool to room temperature, draining the cooled chives, transferring to a tray for distribution with the thickness of 4cm, freezing in a-20 ℃ cold storage for more than 4hr, transferring the quick-frozen chives tray to a vacuum freeze dryer for freeze drying, wherein the heating temperature of the tray in the sublimation stage in the freeze drying process is 55 ℃, the initial vacuum degree is 120Pa, the final vacuum degree is 50Pa, the heating temperature of the tray in the desorption stage is 60 ℃, and the freeze drying time is 11 hr.
The parameters of the carbon dioxide cold well and the energy recovery system are as follows: the temperature of the carbon dioxide cold well is-35 ℃, the outlet end of the carbon dioxide compressor is 118 ℃, the outlet end of the carbon dioxide compressor is 30 ℃, the inlet end of the cooling water is 25 ℃, the outlet end of the carbon dioxide compressor is 86 ℃ and the inlet end of the carbon dioxide compressor is-6 ℃.
And returning the 86-DEG C hot water to the pretreatment end of the chives through a heat-insulating pipeline for recycling, carrying out vacuum packaging on the freeze-dried chives by adopting a common plastic bag, and carrying out sampling analysis to obtain the product with the water content lower than 6%.
Example three:
selecting fresh agaricus bisporus, wherein the agaricus bisporus is white in color, complete in shape and free of mechanical damage and plant diseases and insect pests, cleaning with flowing clear water to remove dirt such as soil and dust on the surface, draining water on the surface, cutting into 4mm slices, soaking in color protection liquid for 10min, draining, washing with flowing clear water for 5min, draining, putting the agaricus bisporus slices after draining into a tray cloth, freezing for more than 5hr at-35 ℃, transferring the frozen agaricus bisporus trays into a vacuum freeze dryer for freeze drying, wherein the tray heating temperature in a sublimation stage in the freeze drying process is 60 ℃, the initial vacuum degree is 100Pa, the final vacuum degree is 30Pa, the tray heating temperature in an analysis stage is 60 ℃, and the freeze drying time is 15 hr.
The parameters of the carbon dioxide cold well and the energy recovery system are as follows: the temperature of the carbon dioxide cold well is-40 ℃, the outlet end of the carbon dioxide compressor is 116 ℃, the outlet end of the carbon dioxide compressor is 28 ℃, the inlet end of the cooling water is 22 ℃, the outlet end of the carbon dioxide compressor is 88 ℃ and the inlet end of the carbon dioxide compressor is-8 ℃.
And returning the 88 ℃ hot water to the agaricus bisporus pretreatment end through a heat insulation pipeline for recycling, and carrying out vacuum packaging on the freeze-dried agaricus bisporus slices by adopting a common plastic bag, wherein the water content is lower than 5% by sampling analysis.
Example four:
quick-frozen strawberries are used as raw materials, the strawberries are softened at the temperature of minus 10 ℃ for 2 hours, the strawberries are cut into slices of 6 to 8mm, the slices are quickly placed into a tray, the thickness of the slices is not more than 3cm, the slices are placed into a cold storage at the temperature of minus 25 ℃ for freezing for more than 2 hours, the quick-frozen strawberries are placed into a vacuum freeze dryer for freeze-drying, the tray heating temperature in the sublimation stage in the freeze-drying process is 100 ℃, the initial vacuum degree is 150Pa, the final vacuum degree is 50Pa, the tray heating temperature in the desorption stage is 60 ℃, and the freeze-drying time is 8 hours.
The parameters of the carbon dioxide cold well and the energy recovery system are as follows: the temperature of the carbon dioxide cold well is-35 ℃, the outlet end of the carbon dioxide compressor is 118 ℃, the outlet end of the carbon dioxide compressor is 28 ℃, the inlet end of the cooling water is 22 ℃, the outlet end of the carbon dioxide compressor is 86 ℃ and the inlet end of the carbon dioxide compressor is-6 ℃.
The 86 ℃ hot water is recycled through a heat-insulating pipeline, the freeze-dried strawberry pieces are vacuum-packaged by double-layer PE plastic bags, and the water content is lower than 8% after sampling analysis.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The element defined by the sentence "comprising one.. said, does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element, the electrical elements presented therein are all electrically connected to an external master and 220V mains, and the master may be a conventionally known apparatus, such as a computer, which acts as a control.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. An energy-saving fruit and vegetable freeze-drying process taking carbon dioxide as a refrigerant is characterized by comprising the following steps:
s1: selecting, pretreating and quickly freezing fresh fruits and vegetables for later use;
s2: placing quick-frozen fruit and vegetable materials into a tray with a thickness of 2-5cm, and vacuum freeze-drying in a vacuum freeze-drying machine at 40-60 deg.C, vacuum degree of 5-120Pa, and cooling well temperature of-35-40 deg.C for 12-36 hr;
s3: water vapor generated in the freeze-drying process is conveyed to a carbon dioxide cooling well in a vacuum system by a vacuum pump to be quickly frozen into frost, the partial pressure of the water vapor in the vacuum freeze-drying system is kept at a lower level, and the sublimation speed of water in the fruit and vegetable raw materials is accelerated;
s4: the carbon dioxide fluid passing through the carbon dioxide cooling well absorbs heat and then is increased in temperature, the carbon dioxide fluid is changed into high-temperature and high-pressure carbon dioxide fluid under the action of a compressor, the heat is transferred to cold water at the other end of the heat exchanger through the heat exchanger, the cold water absorbs heat and is changed into hot water at 85-98 ℃, and the high-temperature and high-pressure carbon dioxide fluid releases heat and then is changed into liquid carbon dioxide below 30 ℃;
s5: the liquid carbon dioxide is decompressed by an expansion valve to absorb a large amount of heat, the temperature is rapidly reduced to below 40 ℃ below zero, the heat of the water vapor is absorbed through the heat exchange of a cold well, and then the temperature is raised to above 10 ℃ below zero, and the liquid carbon dioxide returns to a compressor for recycling;
s6: and collecting the freeze-dried fruit and vegetable products, and packaging and inspecting to obtain finished products.
2. The energy-saving fruit and vegetable freeze-drying process taking carbon dioxide as a refrigerant as claimed in claim 1, is characterized in that: in the step S3, the water vapor generated in the freeze-drying process is delivered to a carbon dioxide cooling well in the vacuum system by a vacuum pump to be rapidly frozen into frost, and the cooling well needs to be pre-cooled to-35 to-40 ℃ to ensure that a large amount of water vapor generated in the initial freeze-drying stage can be rapidly frozen into frost.
3. The energy-saving fruit and vegetable freeze-drying process taking carbon dioxide as a refrigerant as claimed in claim 1, which is characterized in that: in the step S4, the high-temperature and high-pressure carbon dioxide fluid from the compressor is subjected to heat exchange, the temperature of hot water can reach 85-98 ℃ as required, and the hot water is directly used for enzyme deactivation and disinfection of pretreatment of fruits and vegetables.
4. The energy-saving fruit and vegetable freeze-drying process taking carbon dioxide as a refrigerant as claimed in claim 1, which is characterized in that: in the step S5, the flow of the carbon dioxide is controlled, the temperature of the carbon dioxide which flows back to the compressor for recycling is ensured to be not lower than-10 ℃, and the requirement of the compressor for normal operation is met.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110098664.6A CN114791206A (en) | 2021-01-25 | 2021-01-25 | Energy-saving fruit and vegetable freeze-drying process taking carbon dioxide as refrigerant |
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| CN202110098664.6A CN114791206A (en) | 2021-01-25 | 2021-01-25 | Energy-saving fruit and vegetable freeze-drying process taking carbon dioxide as refrigerant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115542862A (en) * | 2022-11-04 | 2022-12-30 | 日照鼎立钢构股份有限公司 | Drying scheme decision method and system for improving freeze-drying quality of fruits and vegetables |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102342318A (en) * | 2011-09-07 | 2012-02-08 | 大连铭德生态农业专业合作社 | Vacuum freeze drying process for fruits and vegetables |
| CN111365875A (en) * | 2020-05-26 | 2020-07-03 | 华东交通大学 | Pharmaceutical factory sewage source mechanical refrigeration cold-trap system |
-
2021
- 2021-01-25 CN CN202110098664.6A patent/CN114791206A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102342318A (en) * | 2011-09-07 | 2012-02-08 | 大连铭德生态农业专业合作社 | Vacuum freeze drying process for fruits and vegetables |
| CN111365875A (en) * | 2020-05-26 | 2020-07-03 | 华东交通大学 | Pharmaceutical factory sewage source mechanical refrigeration cold-trap system |
Non-Patent Citations (1)
| Title |
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| 蒲云峰等主编: "《食品加工新技术与应用》", 中国轻工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115542862A (en) * | 2022-11-04 | 2022-12-30 | 日照鼎立钢构股份有限公司 | Drying scheme decision method and system for improving freeze-drying quality of fruits and vegetables |
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