The principle of ultra-high temperature instant sterilizer is mainly divided into direct and indirect heating. Among them, there are two kinds of steam inflow type and material blowing steam in direct heating (no boiler user can also use electric heating ultra-high temperature instantaneous sterilizer) ), while indirect heating is divided into tube sterilizer and plate sterilizer. Indirect heating is most common in domestically produced UHT machines. Tubular ultra-high temperature sterilizers, which we usually call transient ultra-high temperature sterilizers, are widely used in fluid foods such as dairy, beverages, alcohol, ice cream, juice and soy sauce, and have unparalleled advantages over other equipment. Sexuality, favored by manufacturers in the food industry. At present, the combination of ultra-high temperature sterilization technology and aseptic filling has become a major trend in fluid food production. This article will mainly discuss the principle, characteristics, use and precautions of the instantaneous ultra-high temperature sterilizer. First, the principle of ultra-high temperature instant sterilization machine: The general material is pumped into the hot and cold material heat exchange device in the sterilizer to be preheated, and then passed through a high-pressure high-temperature barrel, the material is rapidly heated to the sterilization temperature and maintained for about 3 seconds before and after. And the enzymes were quickly killed. After the material exits the high temperature barrel, it is cooled by heat exchange with the cold material, and the temperature is generally lower than 65 °C. If the next process needs to increase the temperature, it can be achieved by adjusting the angle cut-off valve or circulation, etc., otherwise the cooling water is added to reduce the discharge temperature. The discharge is controlled by a throttle valve that allows the boiling point of the material to be above the maximum temperature while maintaining a certain pressure. This valve is adjusted during normal production, and the back pressure control flow is generated by the pump's urging force against the spring pressure, and should be fully opened when cleaning the sterilizer. The circulating storage tank can be used to prepare an acid-base solution for effective cleaning of the inner wall of the coil. Due to the simultaneous use of stainless steel three-way cocks, the flow rate can be adjusted appropriately. Second, ultra-high temperature instant sterilization machine features: 1 . The sterilization temperature is very high, the effect is obvious, the high temperature time is extremely short, so the chemical changes caused are small, the material characteristics are ensured, and the product quality is stabilized; 2 . Safe to use, easy to operate, the device is in a fully sealed form, and the operating procedures are programmed; 3 . With a small footprint, a 2 ton / hr instantaneous ultra-high temperature sterilizer covers an area of ​​only about 1 m2; 4 . It can realize the in-situ non-disassembly cycle cleaning (CIP) of the equipment; 5 . Since the heat exchanger having a hot and cold material is designed to have an economical effect of waste heat utilization, the steam consumption is small. 6 . It is used in series with centrifugal pump or high-pressure homogenizer. It has a wide range of applications and is suitable for sterilization of high-viscosity materials, such as condensed milk. 7 . The equipment is durable and has a low depreciation rate. In addition to regular replacement of wearing parts such as seals, most of them can maintain good performance for a long time. Third, ultra-high temperature instant sterilizer operation: Instantaneous ultra-high temperature sterilizer is easy to operate, the procedure is as follows: Before each use, the state of the sterilizer must be thoroughly checked, including safety valves, traps, pressure gauges and thermometers, and whether the pipes are unblocked. At the same time, it is necessary to store the water in the storage tank and connect the feed pipes. it is good. Open the water clear valve at the upper end of the storage tank, start the feed pump, start the circulation of clean water in the sterilizer, and then slowly open the steam to make the sterilization temperature meet the process requirements, and adjust the discharge temperature by the size of the cooling water. When the predetermined requirement is reached, close the fresh water valve, turn the rotary elbow to the overflow pipe, and discharge the clean water. When the clean water in the storage tank is exhausted, the feed three-way plug is quickly opened; When the rotating elbow starts to discharge the material, the elbow is turned to make the material flow into the storage tank, and at the same time, the discharge three-way rotary plug discharge is opened, and the temperature in the sterilization is maintained. Before the material is sterilized, fill the storage tank with clean water. When all the sterilization is completed, open the feed tee to the water inlet and open the water clear valve until the discharge tee flows out of the clean water. After the water is circulated in the sterilizer, turn the rotating elbow to drain, and when the water is clear, stop the washing. Prepare the acid-base solution in the storage tank, heat it to about 75 °C, wash it separately, and then rinse it off with clean water. After the completion, drain the water to fill it in the sterilizer until the next use. Clean up the surrounding hygiene. Fourth, the use of ultra-high temperature instant sterilizer In order to ensure the performance and life of the instantaneous ultra-high temperature sterilizer and ensure safe production, the following problems should be noted during use. 1. Regularly check the steam trap and filter to prevent the discharge of steam condensate from being blocked. 2. Always check if the safety valve, pressure gauge and thermometer are malfunctioning. 3. If it is found that the leakage of the shaft seal of the feed pump is serious, it should be repaired in time, or the end seal ring should be replaced. 4. If it is used together with the homogenizer, it can be equipped with 3WR-1.5 high pressure pump and maintenance according to the product manual. 5. If there is a possibility of freezing during the winter stoppage, drain the water in the pipe or fill the pipe with 1% lye. 6, material joints and cocks should always check the sealing performance is good, to prevent leakage and air mixing. If there is air in the material, it will accelerate the fouling of the material on the pipe wall. 7. When the equipment is not in use, the steam discharge valve should be opened for future use. 8. The motor bearing of the feed centrifugal pump should be cleaned once a year, and the oil should be changed. The amount should not be too much, as long as it is half filled with the bearing shell. 9. The feed pump is not allowed to idling without liquid. 10 . When a sudden power failure occurs during the sterilization process, the steam should be quickly shut down, the steam exhaust valve is opened to exhaust the steam in the high temperature tank, and the water inlet shutoff valve is opened. 11 . If there is a stoppage or the air pressure does not meet the process requirements during the sterilization process, the valve should be adjusted to circulate or temporarily stop the material. 12 . Prevent debris and the like from entering the clogging sterilizer, and the entry of air will accelerate the fouling of the coil. 13 . When the equipment is temporarily not in use, the angle shut-off valve and steam drain valve should be opened for the next use.
1 . Check and prepare before operation
2 . Cyclic temperature regulation
3 . Drainage feed
4 . Sterilization
5 . Cleaning