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The most basic way of refrigerated transport of aquatic products
Release date：2015-12-02 14:27:38
Aquatic products is indispensable food in People's Daily life, so what are refrigerated transportation of aquatic products?
(a) with ice freezing
Before fishing boat voyage, the refrigeration unit to keep fish room temperature 7 ℃. The fish immediately with 1:3 fish than ice, put the fish into ice cools the fish return tank temperature should be kept in - 2 ℃.
(2) ice salt method
When mixed with salt, relieving ice ice and salt melting quickly, in a short period of time to absorb a large amount of heat, the temperature drops rapidly. Within a certain range the greater the proportion of salt on ice, the faster the more the melting of the ice, drop in temperature is lower. Salt ratio was 29%, the temperature can fall to - 20 ℃. Adding 3% of salt production in general in the crushed ice, make temperature down to about 3% for transport or storage. But because the ice melting fast, cooling temperature is low, the ice melted ice water absorption of heat, the temperature of the fish back up, in the process of preservation, is inferior to separate water to maintain a long time at low temperature. So ice salt preserve fresh for a short period of time, or in front of the air-conditioning season for iced fish precooling is more appropriate.
(3) the low temperature freezing brine method
Because salt water heat transfer coefficient is big, will catch content in 1-5 ℃ low temperature salt water, cooling rapidly. Freezing brine in the ship's main device including freezing brine tank, heat preservation fish room and refrigeration system. Operation, first prepared a certain amount of cold saline, then freezing pumping clean water into the tank, add salt to the water about 10 baume degree. Brine temperature by cooling down to 5 ℃, at the same time cold fish hold to 3 ℃. Then wash the fish content into rotation in salt water inside the mesh bag for freezing, when the temperature of the brine recovery continue to cold down to - 5 ℃, to fish body core temperature - 2 ℃. After the freezing will catch content into insulation fish hold bulk stacking, and blowing cold, maintain a fish room temperature for about 3 ℃. Every time after freezing brine concentration, adding salt, salt water according to the pollution degree of change in time.
