The domestic coal gas phase drying equipment has been on the market for more than ten years. It is actually used by corresponding enterprises in the domestic pharmaceutical, food, biological, chemical and other fields. At present, there are no less than ten manufacturers of coal gas phase drying equipment in China. However, there are very few enterprises that can actually design and manufacture coal gas phase drying equipment and provide users with ideal products. Most manufacturing enterprises still do not have complete design and manufacturing conditions.
From the perspective of its basic structure and principle, the coal gas phase drying equipment seems not complicated. Many pharmaceutical and food machinery manufacturers think it is easy to get started. However, when they actually get involved in this project, it is like blindly entering a maze where it is difficult to find a clear direction. Not only are they deeply trapped and unable to get out, but occasionally a few customers also drag others into the water. The main reasons for this are that the technology involved in this kind of equipment is extensive, the system configuration is numerous, the manufacturing process and assembly requirements are high, and the installation and commissioning need rich practical experience, etc. Therefore, it is simply impossible to design and manufacture a qualified coal gas phase drying equipment by just one or two mechanical engineers or a few technical workers. Especially, many edge technologies could not be used in the previous static drying equipment. When designing and manufacturing equipment that is completely in a vacuum dynamic drying state, if the original design concept is not broken away, it is doomed to fail.
The content expounded in this article includes the key points of selection, design, manufacture, configuration, installation and commissioning, as well as after-sales service precautions of coal gas phase drying equipment. It is hoped that it can be helpful to enterprises engaged in the manufacture of coal gas phase drying equipment and the vast number of users who plan to introduce this new type of drying equipment.
As mentioned in the preface, the application scope of coal gas phase drying equipment is very wide. Currently, it has found its application in the fields of pharmaceuticals, food, biology, and chemical engineering. However, in each field, the selection criteria are not the same. This is because the requirements and parameters for drying materials in different fields vary significantly. For instance, in the pharmaceutical industry (especially in traditional Chinese medicine), the viscosity of the extract is generally high, and the drying temperature requirements are strict. The control of the melting point needs to be precise (especially for polysaccharide materials), and the control range of the vacuum degree should meet the heating temperature requirements of different sections and have an online automatic adjustment function, etc.
In addition, the detection system should be as perfect as possible to meet the GMP standards for pharmaceuticals. For the food industry, the solid content of the material extract is generally relatively high (above 65%). The requirements for output and the specific volume and appearance of the product are the key factors in the selection criteria of vacuum belt dryers. There are two elements that must not be ignored in the selection process of food-grade vacuum belt dryers: One is the issue of the consumption ratio per unit of energy consumption, and the other is the supporting equipment such as the pre-stage conveying of raw materials, fine grinding of products after drying, and packaging, etc. As for vacuum belt dryers used in biology and chemical engineering, due to the diverse forms of products, the selection criteria are extremely complex, so extra caution is required.