Technical Trend Analysis of Modified Atmosphere Preservation Machine

Modified atmosphere preservation technology has been studied in China since the 1990s, and technology development has been carried out in accordance with national conditions. After repeated practice, an independent and innovative database construction technology was formed, which solved the key to the airtight technology of brick structure storage, refined the configuration of technical equipment, and optimized the air conditioning process. The storage tank adopts an advanced carbon molecular sieve physical adsorption method, which has no negative effect on the stored fruits and vegetables, fully meets the requirements of green food, and has obtained a patent. Due to the establishment of a new airtight structure concept and the expansion of the idea of building a warehouse, the original brick structure building can be newly built or transformed into an air-conditioned warehouse; the air-conditioning function of a constant temperature warehouse and a cold storage can be increased. It can build a modified atmosphere fresh-keeping warehouse with different reserves from 10 tons to 500 tons or more. It creates conditions for promoting the popularization and promotion of modified atmosphere preservation technology, and provides support for users to expand industrial economic development.

The research on air conditioning technology can be traced back to 1821, when the German biologist Berard discovered that fruits and vegetables can reduce metabolism when the oxygen level is low. But it wasn't until the 20th century that people really began to study the atmosphere. In the 1960s, Professor Stanley Burg of the University of Miami in the United States first proposed the concept of Hypobaric Storage, and in the 1970s, there was an upsurge of research on hypobaric storage in the world. However, due to the extremely high manufacturing requirements of large decompression vessels, the cost cannot be reduced. This technology cannot be industrialized and has remained at the laboratory stage. In the past 20 years, CA storage has been promoted due to its relatively low cost and significantly better storage effect than refrigeration, and has become the mainstream of controlled atmosphere storage at home and abroad. It is worth mentioning that Chinese scholars have made certain achievements in the research of decompression atmosphere, especially in the production of low-cost decompression vessels, making the industrial promotion of decompression storage a reality.

In 1997, my country built the world's first 1,000-ton (2,000 tons) vacuum storage fresh-keeping warehouse in Baotou. However, there is still a big gap between my country and developed countries in the preservation of fresh fruits. According to reports, in western developed countries, the fresh-keeping storage of fresh fruits accounts for about 40% of the total fruit output, and the fresh fruits stored in the controlled atmosphere refrigerator account for 80% of the total storage. In 1996, my country's fresh fruit storage was only 22% of the total fruit output, about 10 million tons, of which cold storage accounted for 50%-60%, while the storage of controlled atmosphere cold storage was less than 100,000 tons. The main reason restricting the promotion of air conditioning technology in my country is still economic factors. The economic storage capacity of the air conditioning storage is 1,000 tons. The investment of this scale CA library is more than 10 million yuan, and the decompression library is more expensive, requiring 18 million yuan. The investment in fixed assets for building a warehouse equivalent to storage per kilogram of storage is about 9 yuan, which is relatively low for fruit and vegetable products and obviously too expensive for China, which has an underdeveloped economy. The time for large-scale development of modified atmosphere preservation is not yet ripe.

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