Centrifugal spray drying applications in the dairy production and transformation
Centrifugal spray drying technology in the late 50's in China Dairy Industry began to apply, more than 40 years. At present, Dairy About 5% of the industry manufacturers to adopt this technology. It promoted the rapid development of China's dairy industry has played a positive role.
1 birth of centrifugal spray drying
In China dairy industry first application of spray drying technology is the "pressure", and "two fluid" technology, was due to technological level and production scale factors such as the restrictions, only horizontal, level, multi-nozzle form, the evaporation capacity of the majority in the 250kg / h the following. Mid-60s, Andy dairy installed a Evaporation 350kg / h horizontal pressure spray Drying equipment , Nozzle to 7; assistance in Albania in 1967, providing a spray drying equipment is imitation dairy plant in 1965, the southern suburbs of Beijing from Japan introduced evaporation 350kg / h pair of nozzles, horizontal, pressure spray dryers, required evaporation 150kg / h, has a dual nozzle; the late 60's the first time Shanghai milk crystal factory installed three vertical pressure spray dryer, the evaporation capacity of 250kg / h, less than 3 nozzle no avail. The multi-nozzle hot at the emergence of a false theory is mainly the upper hand. Many people believe that the nozzle diameter is not greater than a certain value, otherwise, the material can not be atomized. This was the case of smaller capacity equipment, will inevitably lead to more nozzles are used, the production of small diameter nozzle, the smallest nozzle diameter is only 0.5mm, which to the production operation and management resulting in many problems, but mainly to Milk powder Particles small, poorly prepared and sex, color, organization status is not as customers.
To solve this problem, many manufacturers, research institutes, universities look for from the many and good production reconstituted instant milk powder, "and then a" two-drying "," add lactose recrystallization Law ", etc. trial production, but the end result of high cost, large-scale continuous production can not meet the promotion. Meanwhile, there Centrifugal spray drying technology and a certain development, the main reason was to rival the centrifugal spray machine indigenous low speed, only 5000r/mim) around, as speed is low, the powder particles emitted large spray prepared and better than the product pressure in the market relative by users. until the 70's last exit spray drying to produce heart of milk in the market dominated. There were a few representative works are the Songhua River dairy milk, dairy plants Chahayang, dairy west of Beijing, Zhao Er dairy factory.
2 centrifugal spray drying of recession
1980 in Heilongjiang Province Dairy machinery Plant design evaporation 250kg / h single-nozzle vertical pressure dry spray devices 10, 1982 Tailai dairy into normal operation, then, new construction, expansion of the dairy plant decreased by centrifugal drying, some centrifugal spray technology has been used the old plant, the expansion began with the pressure spray technology, manufacturers do not consider the simultaneous use of two techniques of management of inconvenience, such as milk crystal factory in Fuyu County, Zhaodong dairy, dairy west of Beijing Factory, Hulan dairy plants, dairy plants, etc. Song station. Some centrifugal spray technology has been used for many years the old factory, the new pressure spray drying equipment is installed after the original centrifugal spray drying equipment to disable or remove altogether, such as Zhaodong dairy, dairy west of Beijing; of 80 Since the end of the decade, there has been "eccentric" to "pressure" phenomenon, by the author of successful transformation are rich dairy, Songhua dairy plants, dairy plants and waves Song stop grazing dairy. The emergence of these phenomena, it has been a growing recognition that the "centrifugal spray" and "pressure spray" centrifugal spray drying technology in China dairy industry's market has been shaken, pressure spray drying technology has been 10 has an absolute advantage, you can say "centrifugal spray" in the dairy industry in China has begun to decline. Debate the advantages and disadvantages of two methods rarely hear, you can not hear "centrifugal" formula than the "pressure method" of good quality positive statement.
Produce this change, there are many factors to analyze the reasons. The following main points:
(1) theoretical misconceptions
Denmark K? Masituosi the "Spray Drying Handbook" clearly pointed out that the centrifugal spray drying method is suitable for the production of small particles of products. Some people could not because we made high-speed centrifugal spray machine, Ershi bad case of atomization of particles greater milk production mistaken for a centrifugal spray advantages.
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