How falling film evaporators prevent fouling and maintain stable operation of equipment

How falling film evaporators prevent fouling and maintain stable operation of equipment

Falling film evaporation has the advantages of high heat transfer coefficient and small heat transfer temperature difference. Compared with other forms of evaporators, falling film evaporator heat transfer coefficient is higher, heat transfer effect is also better, and the one-time investment cost is less, and is now widely used in food, medicine, chemical industry, energy and other fields. After years of development, as well as the progress of science and technology, the falling film evaporator continues to meet the needs of the pharmaceutical industry and other industries, and the performance is constantly being improved.

At present, the falling film evaporator model on the market is various, many manufacturers can provide customized services according to the needs of users, to meet the actual needs of users. It is worth mentioning that the evaporation tube of the falling film evaporator is generally easy to appear fouling and other problems, either light or heavy, which directly reduces the heat exchange efficiency of the falling film evaporator, and even makes it difficult for the equipment to operate normally, causing greater economic losses. Therefore, how to prevent scale and scale removal, keep the equipment stable operation, is the bottleneck that industry enterprises need to crack.

It is understood that the current measures to prevent evaporator equipment scaling mainly include crystal seed method, add scale inhibitor method, add acid method, purification pretreatment method, control solid-liquid ratio method, etc., of which pretreatment method is one of the common methods to prevent scaling, its hardness and alkalinity removal process, can remove calcium, magnesium ions and sulfate, carbonate ions in concentrated salt wastewater, to prevent calcium carbonate and calcium sulfate scaling. By actively taking anti-scaling measures, enterprises can to a certain extent reduce the probability and speed of fouling in the evaporation tube of the falling film evaporator.

And for has appeared dirt membrane evaporator, in order not to delay the production task, generally need enterprise to take certain scale removal measures. Some medicine machine people said, its company's tube type falling film evaporator in work after a certain time will stop processing, and according to different ways to clean, such as distribution plate scale piece easy to clean and heating surface structure cleaning. "Because of the open structure of the distribution plate of the tubular falling film evaporator, when cleaning it, the operator can enter through the manhole and clean it. The cleaning of the heating surface structure will be relatively simple and easy to operate, the operator can enter the evaporator through the upper and lower manholes, open the cloth liquid tray and then clean each heating tube." The person said so.

I learned that, for the descending film evaporation of the scaling problem, some domestic researchers have for domestic and foreign in addition to scale and strengthen the heat transfer technology research status, and actively explore the descending film evaporation tube online in addition to scale and strengthen the heat transfer method, in order to solve the descending film evaporation process of dry wall, tube wall scaling and cloth membrane device blockage and other problems. It is believed that in the future, with the birth of new technology and new ideas, and the implementation of design solutions, the descending film evaporator with the function of online cleaning of anti-scaling will solve the trouble of anti-scaling of enterprises, improve the heat transfer coefficient of equipment and maintain the stable operation of equipment.

For the falling film evaporator enterprise, in each big industry to the falling film evaporator application broadening background, enterprise only active pulse market development trend, seize the actual needs of users, and constantly innovate and improve equipment, can get more development opportunities. For example, in the case of rising costs, capacity expansion of production enterprises, film drop evaporator urgent need to accelerate the transformation and upgrading towards automation, intelligent direction; for example, in the prevailing wind of energy saving and environmental protection, reduce production energy consumption is the common pursuit of all production enterprises, film drop evaporator industry is also urgent to reduce energy output, enterprises need to strengthen innovation and research and development, optimize equipment design, reduce energy consumption of equipment, reduce costs, In order to meet the new needs of the market.

Source: Reproduced