The retort is a closed, pressurized heater that heats the food sealed in the container. A variety of different sterilization pot systems can be used for foods that are packaged and packaged in a container for commercial aseptic sterilization.
The retort system has some of the same characteristics:
The system is pressurized and the transfer temperature is much higher than boiling water.
The system uses a medium (called a heating medium or a sterilizing medium) as a means of transferring heat to the product. The medium used in the pan includes pure steam, hot water (the container is completely submerged in water, water spray or water spray) and a steam/air mixture.
Some systems use overpressure during sterilization and cooling to maintain the integrity and balance of the vessel to counteract the pressure inside the tank. This is necessary because some packaging containers have limited tolerance to internal pressure. Some examples of overpressure sterilization containers are semi-rigid plastic containers with heat-sealed or bimetallic seamed can ends, soft bag bags, metal plates, cardboard containers, and glass cans. The pressure at 250 °F is approximately 15 psig, and any pressure applied to the sterilizer that exceeds the 15 psig is referred to as overpressure. An overpressure system, such as a 25-35 psig sterilization system, can be operated at higher temperatures.
The heat source is supplied to the sterilizing pot by installing two steam distributing tubes at the top and one steam distributing tube at the bottom, and the cold air and steam in the pot are thoroughly mixed as a heat transfer medium through a large-flow axial flow fan installed in the sterilizing pot. Uniform heating and sterilization of the canned food in the sterilization pot, the sterilization process does not require an exhaust process, and the large-flow fan can fully disperse the airbag in the air in the pot and mix it with the steam as a heat transfer medium for sterilization. . The gas-vapor mixture is forcedly circulated through the air duct in the sterilizing pot to make the heat distribution in the sterilizing pot uniform to meet the requirements of the heat sterilization process of the canned food in various packaging forms. Since the conventional exhaust process is not required, the steam consumption is greatly reduced, and the large noise generated in the workshop exhaust is reduced.
Advantages of the new sterilization pot compared with the traditional sterilization pot:
1. From 20 ° C to 60 / 70 ° C, the steam injection temperature is high, the temperature rises quickly, so the steam / gas hybrid sterilizer heats up quickly (no need to heat water), especially suitable for hot-filled products;
2. When the spray type heat exchanger enters the cold water, the water vapor and the cold will vibrate, and the steam/gas mixed type sterilization pot will not;
3. The steam/gas hybrid sterilizer does not need water, no need to heat the water, so the heating process is very short, but the spray needs to heat the hot water first;
4. The investment cost of the steam/gas hybrid sterilizer is low (no need for cooling towers, boilers, circulation pumps, etc.);
5. The steam/gas hybrid sterilizer is more energy efficient;
6. The use of steam / gas hybrid sterilizer is more efficient;
7. The fluidity of steam is 3-4 times higher than that of water (heat exchange of steam is 3-4 times higher than heat exchange of water);
8. Disadvantages are transformed into advantages: entering cold water will impact the packaging, solution: adding warm water cooling system, injecting warm water, thus avoiding product packaging shrinkage shock (warm water cooling device: condensed water collected into the warm water cooling device).
9. When steam and water are mixed, it will generate a lot of noise when it is cold. The steam/gas mixed type sterilization pot will not (large noise is generated when the spray type is cooled, and large noise is generated when the steam sterilization pot is used for exhausting).
How to keep the temperature of each part in the sterilization pot uniform during the sterilization operation is often a problem that the production process makers and operators are very concerned about; in today's China, Zhucheng, where environmental protection pressure is increasing, energy conservation and emission reduction are highly valued by all sectors of society. The successful development of this new type of sterilization pot in the powerful machinery factory of the city marks that China's food heat sterilization equipment manufacturing industry has once again made a major breakthrough in the field of technological innovation.
Xinhui Jielide Garment Factory , https://www.ntgfwear.com