What is the difference between a modified atmosphere storage and a fresh keeping warehouse

Controlled atmosphere warehouses should generally be built into single-storey buildings. When fruits and vegetables are transported, stacked and stored in the warehouse, the ground has to bear a lot of load. The building height of the larger modified atmosphere storage is generally about 6m.

The size of the volume of the modified atmosphere storage warehouse. Take 30 100t as a bay.

There are many people who will directly ask how much a fresh-keeping warehouse costs. In fact, merchants can't tell customers how much a fresh-keeping warehouse costs at once. Because the fresh-keeping warehouse is calculated according to the specific requirements of the customer.

The most basic calculation parameters of the fresh-keeping warehouse include the area and height of the fresh-keeping warehouse required by the customer, which is the so-called length, width and height, and the corners and the main problems in the installation process should be considered in addition to the length, width and height; whether the wall needs to be modified, etc. There is also the temperature, according to the temperature of the fresh storage has different classifications; For example, high-temperature storage, medium-temperature storage, low-temperature storage, etc.; It can also be divided into fresh-keeping storage, cold storage, freezer storage, quick-frozen storage and so on. Different temperatures** are also different.

Under normal circumstances, the lower the temperature of the fresh-keeping warehouse with the same area and height, the higher the temperature. There is also the difference between the small fresh-keeping warehouse and the fresh-keeping warehouse project. Many times people will ask, how much is to make a small fresh storage, the distinction of small fresh storage is no concept, 5 square meters can be called a small fresh storage can also be called a micro fresh storage, 10 square meters, 20 square meters, 30 square meters or even 50 square meters 80 square meters can be called a small fresh storage.

Then it can be seen that ** must be different. There is also the unit, like we buy other products, the same performance of the product according to the different popularity and brand, ** is also different. The same is true for library boards, which have different materials and thicknesses, and the thermal insulation performance is not nearly the same.

Many fresh-keeping warehouses are customized according to the needs of customers**. It is to provide customers with solutions according to the length, width and height, temperature, humidity and other parameters required by customers. For example, the area or volume required by the customer is defined according to the volume of incoming and outgoing goods, and the temperature is defined according to the stored items.

Therefore, how much it costs to build a fresh-keeping warehouse depends on the specific size, temperature and equipment materials selected. In this way, it can be better to give**.

The difference between controlled atmosphere storage and ordinary cold storage in terms of construction and operation management.

Air tightness Air tightness is one of the most important features that distinguishes the building requirements of controlled atmosphere storage from cold storage. In addition to thermal insulation, moisture-proof and reduce the exchange of cold and heat with the outside world, the controlled atmosphere warehouse requires that the enclosure structure should not only be thermal insulation and moisture-proof, but also require strict sealing around the walls of the reservoir body, the warehouse door and all the incoming and outgoing pipeline connections, so as to reduce the gas exchange inside and outside the warehouse as much as possible. Only in this way can the gas composition in the warehouse be artificially adjusted and the interference of external gas on the gas composition in the warehouse can be reduced or avoided.

Safety Due to the strict requirements for the airtightness of the controlled atmosphere warehouse, in the process of cooling and air regulation, with the change of temperature and pressure in the warehouse, the pressure difference between the two sides of the cold storage plate will occur, which will destroy the airtight layer, and even the enclosure structure will expand or collapse. In order to balance and reduce the pressure difference between the inside and outside of the warehouse, the controlled atmosphere warehouse must be equipped with a safety valve and a breathing bag.

Fast in and out of the whole cargo.

The shorter the time for the fruit to enter the modified atmosphere state, the better, and the storage of the modified atmosphere warehouse requires the fruit to be stored quickly, so as to fill the door, seal the door and regulate the air as soon as possible. During the storage process, the number of door openings should be reduced as much as possible, and frequent door opening will not only affect the storage effect, increase the operating cost, but also reduce the air tightness of the storage door. When the fruit is out of the warehouse, in order to ensure the shelf life of the fruit, it is best to finish it at one time or in batches in a short period of time.

In addition to setting aside the necessary ventilation and inspection channels, the fruits in the warehouse should be stacked as high as possible. On the one hand, because the more fruits in the store, the fewer pores in the storehouse, and the oxygen consumed by fruit respiration, the shorter the time for the fruit to enter the modified atmosphere state; On the other hand, the larger the utilization coefficient of the storage volume, the lower the operating cost of refrigeration and gas regulation.

In use, the differences between controlled atmosphere storage and cold storage are as follows:

The storage time of modified atmosphere is longer, generally twice longer than that of ordinary cold storage;

Compared with cold storage, the freshness and crispness of fruits and vegetables in modified atmosphere storage are better;

The shelf life of vegetables can be extended by 21-28 days after controlled atmosphere storage, and 3-7 days for ordinary cold storage;

A modified atmosphere bank is a low-oxygen environment that inhibits the growth of mold and pests and pests, and maximizes the integrity of fruits and vegetables.

The modified atmosphere warehouse must use the metal polyurethane sandwich composite panel made by the high-pressure continuous foaming machine as the insulation material for the wall and roof, so as to ensure the sealing requirements in the warehouse under the condition of high pressure difference.

Advantages of Modified Atmosphere Library:

On the basis of refrigeration, the controlled atmosphere warehouse increases the adjustment of gas composition, and through the control of temperature, humidity, carbon dioxide, oxygen concentration and ethylene concentration in the storage environment, it inhibits the respiration of fruits and vegetables, delays their metabolic process, better maintains the freshness and commerciality of fruits and vegetables, and prolongs the storage period and freshness period (sales shelf life) of fruits and vegetables.

Generally, controlled atmosphere storage can extend the storage period by many times compared with ordinary refrigeration; The fruits and vegetables stored in the controlled atmosphere warehouse are first served after leaving the warehouse"Hibernation"Status"Wake up", which can extend the shelf life (sales shelf life) of fruits and vegetables after leaving the warehouse by 21 to 28 days, which is 4-5 times that of ordinary cold storage.

Now in a lot of storage polyurethane board, although many people will use cold storage, but some modified atmosphere storage is also widely used. Compared with cold storage, controlled atmosphere storage has the following advantages:

1. The controlled atmosphere storage belongs to the category of high-temperature storage, and the food to be kept will not freeze, retain the original flavor of the food, and the nutrition will not be lost;

2. Under the same preservation quality and temperature conditions, the preservation time of the modified atmosphere storage is 3 5 times that of the cold storage, and even dozens of times for some foods, which is incomparable to the cold storage;

3. Because the operating temperature of the modified atmosphere is 0 8, which is 18 33 higher than that of the ordinary low-temperature cold storage, the power consumption of the modified atmosphere is much less than that of the ordinary cold storage in the same preservation time;

4. The modified atmosphere warehouse uses inert aspirant gas to isolate the air, which can effectively inhibit the respiration of food cells and then mature, which not only prolongs the preservation time, but also prolongs the shelf life of food after leaving the warehouse, making it possible to sell food for a long time after leaving the warehouse;

5. The controlled atmosphere library uses CO2 gas to participate in the modified atmosphere, which can not only effectively inhibit the generation and effect of C2H4 and other ripening components, but also has the functions of sterilization, bacteriostatic and pesticide detoxification;

6. Due to the humidification system used in the modified atmosphere, it can not only keep the moisture of the food itself from being lost, but also will not change the color and texture of the food, which not only reduces the storage loss of the food, but also retains the original quality of the food.

7.The controlled atmosphere warehouse adopts PLC program automatic control, which is safe and reliable, and has high production efficiency.

Modified atmosphere preservation is to artificially control the proportion of nitrogen, oxygen, carbon dioxide, ethylene and other components in the gas, humidity, temperature (above the freezing critical point) and air pressure, and delay the metabolic process by inhibiting the respiration of the cells of the storage, so that it is in a near-dormant state, rather than a state of cell death, so as to keep the texture, color, taste, nutrition and other basic unchanged of the stored objects for a long time, so as to achieve the effect of long-term preservation. Even if the stored material is removed from the controlled atmosphere preservation environment, its cellular life activities will still maintain the normal metabolic rate in the natural environment and will not mature and decay quickly.

Features of modified atmosphere fresh-keeping warehouse:

Extend the storage period of fruits and vegetables, generally twice as long as ordinary cold storage, and store them to the most expensive**time**, which can obtain the highest profit.

It can keep the freshness and crispness of fruits and vegetables, and the nutrients, hardness and color of fruits and vegetables after leaving the warehouse can meet the best storage requirements. The fruit is crispy and the vegetables are tender and green, almost the same as the freshly picked state, providing high-quality fruits and vegetables to the market.

It can inhibit the occurrence of fruit and vegetable pests and diseases, so that the weight loss of fruits and vegetables and the loss of diseases and pests are minimized.

The shelf period of fruits and vegetables out of the warehouse can be extended to 21 28 days.

These installation standards are required to be dropped by professional technicians.

Controlled atmosphere storage is achieved by controlling the gas composition in the warehouse, which is often used to store vegetables and fruits, and has one more set of modified atmosphere equipment than the general fruit and vegetable fresh-keeping warehouse, and the price is much higher. However, the controlled atmosphere storage and preservation effect is good, and it is suitable for the storage of large quantities of first-value fruits.

The modified atmosphere storage saves electricity compared to the cold and can maintain the taste of food.

The so-called modified atmosphere preservation is to achieve the effect of freshness through gas regulation method. Gas regulation is to reduce the oxygen concentration in the air from 21% to 3% 5%, that is, the fresh-keeping warehouse is based on the high-temperature cold storage, plus a set of modified atmosphere system, the use of temperature and control of oxygen content two aspects of the joint effect, in order to inhibit the degree of fruit and vegetable respiration, so as to achieve the purpose of preservation.

Modified atmosphere storage is currently the most advanced fruit and vegetable preservation facilities at home and abroad. It can not only adjust the temperature and humidity in the warehouse, but also control the content of oxygen, carbon dioxide and other gases in the warehouse, so that the fruits and vegetables in the warehouse are in a dormant state, and the original quality is still maintained after leaving the warehouse.

The difference between controlled atmosphere storage preservation and cold storage preservation is different equipment, different storage methods, different sizes, different air tightness, and cost costs.

1. The equipment is different.

Compared with the fresh-keeping cold storage, the modified atmosphere storage will add additional equipment such as nitrogen generators, air compressors, oxygen enhancers, carbon dioxide generators, ethylene removers and other equipment when building, so as to improve the storage capacity and ensure the efficiency of the preservation of goods.

2. Different storage methods.

The storage of fresh-keeping cold storage items is relatively casual, there is no strict restriction, and it can be stored and taken at any time, but the controlled atmosphere storage can only be stored and taken when it is used, and if the goods are frequently picked up, the gas composition of the controlled atmosphere storage will be out of balance, which reduces the preservation effect of the items.

3. The size is different.

Generally speaking, the construction area of the controlled atmosphere warehouse is generally larger, and the cost of a small area of controlled atmosphere orange ruler warehouse is relatively high, and the larger the area, the lower the summoning cost of the controlled atmosphere warehouse, which is why the controlled atmosphere warehouse is often made into a group form in the market.

4. The airtightness plexus is absolutely different.

Compared with ordinary cold storage, the air tightness requirements of controlled atmosphere storage are significantly stricter, and the construction process of biogas under construction is not the same in ancient times.

5. Cost of construction.

The cost of controlled atmosphere storage is higher than that of ordinary fresh-keeping cold storage. <>

The characteristics of the modified atmosphere preservation warehouse: the food to be preserved has the characteristics of high nutritional value, long preservation time, low power consumption, etc.;

The controlled atmosphere storage belongs to the category of high-temperature storage, and the food that is kept fresh will not freeze, retain the original flavor of the food, and the nutrition will not be lost.

Under the same preservation quality and temperature conditions, the preservation time of the modified atmosphere storage is 3 5 times that of the cold storage, and even dozens of times for some foods;

Because the operating temperature of the modified atmosphere is 0 8, which is 18 33 higher than that of the ordinary low-temperature cold storage, the power consumption of the modified atmosphere is much smaller than that of the ordinary cold storage under the same preservation time.

The modified atmosphere storage uses inert gas.

Isolated air can effectively inhibit the respiration of food cells and then mature, which not only prolongs the freshness time, but also prolongs the shelf life of food after it is out of the warehouse, making it possible to sell food for a long time after leaving the warehouse.

Carbon dioxide is used in the modified atmosphere storage room.

Gas participation in modified atmosphere can not only effectively inhibit the generation and effect of ethylene and other ripening ingredients, but also have the ability to sterilize, inhibit bacteria and eliminate the toxicity of pesticides.

Due to the humidification system used in the modified atmosphere fresh-keeping warehouse, it can not only keep the moisture of the food itself from being lost, but also will not change the color and texture of the food, which not only reduces the storage loss of the food, but also retains the original quality of the food.

Features of modified atmosphere preservation and storage:

Modified atmosphere storage can be controlled by changing the gas composition and relative humidity of the storage environment under suitable low temperature conditions.

To create the best environment for fruit and vegetable storage to the greatest extent, the fruits and vegetables containing the world acacia that have been stored in a controlled atmosphere have the following characteristics.

Maintain the original shape, color and fragrance of fruits and vegetables well.

The firmness of fruits and vegetables is higher than that of ordinary refrigeration.

Fruits and vegetables can be stored for longer periods of time.

Fruits and vegetables have a low rot rate and low natural loss (water loss rate).

5) Extend the shelf life of fruits and vegetables. Due to the long-term effects of low oxygen and high carbon dioxide in fruits and vegetables, there is still a long period of "lag effect" or dormancy period when fruits and vegetables are released from the modified atmosphere state.

The quality of fruits and vegetables has improved significantly, and they are suitable for long-distance transportation and export sales, creating conditions for export and distribution.

Many fruits and vegetables can reach the anniversary of seasonal production and annual sales**, which has good social and economic benefits.

1) Wide range of application: suitable for the storage and preservation of various fruits, vegetables, flowers, seedlings and so on in the north and south of China.

2) Long storage and shelf life, high economic benefits. For example, after 7 months of grape freshness, 6 months of apples and 7 months of garlic moss, the quality is fresh and tender, and the total loss is less than 5%. Generally, the price of grape production is only 1 5 yuan kg, and the price of storage until around the Spring Festival can reach 6 yuan kg.

The one-time investment is built into cold storage, and the service life can reach 30 years, and the economic benefits are very significant. The investment in the year was fruitful in the year.

3) Simple operation technology and convenient maintenance. The microcomputer of refrigeration equipment controls the temperature, automatically starts and stops, without special supervision, and the supporting technology is economical and practical.

Dehezi (Beijing) artificial ring open environment technology **** said that there are many kinds of modified atmosphere plum fresh-keeping warehouse, the most typical if vegetable fresh-keeping warehouse, etc., it can not only adjust the temperature and humidity in the warehouse, but also control the content of oxygen, carbon dioxide and other gases in the warehouse, so that the fruits and vegetables in the warehouse are in a dormant state, and the original quality is still maintained after leaving the warehouse.