Application development of drying equipment in calcium carbonate industry

heating equipment

The fluidized-bed dryer is second only to the spray dryer. It is divided into a fluidized bed dryer with an agitator at the feeding position and a fluidized bed dryer with internal heat transfer. When the fluidized bed is used to dry the powder materials which are easy to agglomerate or agglomerate, it will be difficult to fluidize in the feeding section with large moisture. At this time, an agitator is set in the feeding section to eliminate the agglomeration problem and achieve normal fluidization. The latter is the combination of conduction heat transfer and convection heat transfer. When the amount of hot air used in normal fluidization state is far from enough to meet the heating equipment heat required for drying, the internal heat exchanger is used to supply part or most of the heat, which can significantly save energy. There are many forms of internal heat exchanger. Fluidized bed is also often used in combination with second and third stage dryers.

Oven

According to an authoritative investigation report of a famous Japanese brewer, after four years of operation, the four shops in dalinggang had a total passenger flow of 5 million person times. Among them, there were 3 million "fans" diners, almost one in four or five Shanghainese. Yes, we have no reason to doubt the survey data of the Japanese for their own commercial interests. Looking back on the dining state of the customers in the shop, it seems that their psychological problem is to doubt again. "

Therefore, for domestic users, it is more convenient to choose domestic equipment than imported equipment. As far as the international market is concerned, China's accession to the WTO will be more conducive to expand the export of drying equipment. At present, China's main export products of dry heating equipment are vacuum drying equipment, vibration drying equipment, small and medium-sized grain, food and agricultural and forestry local products drying equipment, with an annual export volume of more than 100 sets. The main export regions are Southeast Asia and other developing countries, and have opened the door to the European and American markets. At present, the export products of China's drying equipment account for less than 5% of the total domestic drying equipment. It is estimated that the export products will account for more than 10% of the total domestic drying equipment during the 10th Five Year Plan period.

In the international competition, the main competitors of China's drying equipment manufacturers are Denmark, Switzerland, Britain, Germany, the United States and Japan. Compared with the competitors, the advantage of drying equipment in our country is that the heating equipment is cheap, and the disadvantages mainly lie in the degree of automation control, appearance quality, complete set and functional combination of products need to be further improved.

Therefore, domestic drying equipment manufacturers should make full use of the opportunity of China's accession to WTO, strengthen the technical exchange with foreign countries, learn from the advantages of foreign advanced drying equipment, speed up the improvement of automatic control degree, appearance quality, complete set and function combination of drying equipment in China, narrow the gap with foreign products, improve the trust degree of domestic products among users, and improve the reliability of domestic products China's drying equipment not only in the domestic market, but also in the foreign market can occupy a dominant position.