The centrifugal atomizer is suitable for drying thermosensitive substances such as biological products, biopesticides, enzyme preparations, etc. Because the ejected substance only experiences high temperatures when sprayed into mist like particles, it can only be heated instantaneously to prevent damage to these active substances after drying. Therefore, many chemical industries choose to use centrifugal atomizers in product production. So what are the issues to pay attention to when using centrifugal atomizers?
1、 Requirements for ensuring the cleanliness of centrifugal atomizers
Some of the main processes in the processing of centrifugal atomizers need to be carried out in a clean environment of 100000 levels. Spray drying and spray drying are important processes of quality control. To ensure the quality of drugs, the parts in contact with the materials of the centrifugal atomizer should be made of stainless steel, and materials with strong corrosiveness should be made of 316L stainless steel. The inner walls of components such as drying rooms, cyclone separators, and filters that come into direct contact with materials are smooth, without dead corners, and easy to disassemble and clean.
Due to the large internal system of the centrifugal atomizer, it cannot be placed as a whole in the clean area. Often, only a portion of the materials in the clean area are collected. In this case, it is required that the system has good sealing performance to prevent external pollution.
2、 Avoid sticking to walls
In the process of spray drying of solid preparations (especially traditional Chinese medicine) centrifugal atomizers, adhesion is a serious problem, which will hinder the normal operation of centrifugal atomizers. The materials stuck to the wall are not conducive to collection operations, and over time, sensitive materials stuck to the wall will deteriorate into unqualified materials. From a process perspective, solutions include selecting appropriate solvents, adding auxiliary materials, and changing process parameters, but these methods do not have much room for adjustment. Therefore, we need to seek fundamental solutions from the perspective of equipment.
The actual operation process of a centrifugal atomizer can be divided into several steps:
Firstly, when liquid products are fed into a centrifugal atomizer, the high-speed flow channel in the atomizer will atomize the liquid, thereby transforming the product into a solid liquid mixed particle state.
In the second step of the centrifugal atomizer, the atomized particles are guided to a drying chamber with controllable temperature and air flow, and hot air evaporates the liquid in the particles. In order to ensure that the final product meets the standards, the contact time between particles and hot air needs to be appropriate to maintain a certain moisture content in the powder; At the same time, the state of the drying room should also be well controlled, as the volume and air flow of the drying room can affect the nutrition of the product.
The third step is the final step of the entire process, which collects the powder in the airflow into a container through a separator in the centrifugal atomizer, so that the final product can be packaged or mixed with other components.
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