Controlled atmosphere cold storage is an advanced storage technology that combines the technologies of regulating low temperature and controlled atmosphere components.Controlled atmosphere components include:Nitrogen production equipment, ethylene removal equipment, carbon dioxide removal equipment, humidification equipment, gas analysis equipment, pressure balance bag, safety valve. Regulated low temperature includes: refrigeration host, circulating water pump, cooling fan, coolant, temperature control system. Different storage products require different temperatures and different indoor gas composition.
Nitrogen production equipment is mainly used to replace indoor oxygen, reduce the oxygen content in the controlled atmosphere cold storage to 5%, reduce the respiration of fruits and vegetables, effectively delay the aging of products, prevent diseases and bacteria, and inhibit the production of ethylene.Carbon dioxide removal is mainly to prevent high concentration of carbon dioxide, which will cause carbon dioxide poisoning. In general, the concentration of carbon dioxide must be controlled in the controlled atmosphere cold storage.Some fruits breathe actively, which will release plant hormone ethylene, leading to the maturity and aging of products. Therefore, the controlled atmosphere cold storage needs to be equipped with ethylene removal equipment.
controlled atmosphere cold storage has high requirements for the sealing of the storage body. At present, the assembled gas controlled storage is widely used, with fast cycle and good sealing performance. Generally, after completion, the atmospheric pressure test shall not be lower than 196pa, the half pressure drop shall be kept for 20 minutes, and the pressure shall not be lower than 78pa after the atmospheric pressure test. In order to reduce the impact of differential pressure caused by temperature change on he storage body, a pressure balance bag and a safety valve are set in the controlled atmosphere cold .
The refrigeration system of controlled atmosphere cold storage generally has direct cooling and indirect cooling. In terms of product storage quality, it is more appropriate to use coolant indirect refrigeration.The stable environment with small heat exchange temperature difference and high humidity provides better conditions for the preservation of products.
The coolant indirect cooling system has stable control and is suitable for the setting of storage conditions of different products.At present, the application proportion of controlled atmosphere cold storage in China’s high-temperature refrigeration system is still small, generally accounting for 5% ~ 7%.With the development of market demand, many unknown products still lack storage conditions, and more high-performance controlled atmosphere cold storage need to be put into use.In the future, the controlled atmosphere cold storage indirectly cooled by coolant will have a great market prospect. Glacier Coolant focuses on high-end controlled atmosphere cold storage system.