The development of drying equipment in the application of calcium carbonate industry
heating equipment
The fluidized bed dryer is second only to the spray dryer. There are two types of fluidized bed dryers: one with a stirrer installed in the feeding area and the other with internal heat exchange. When using a fluidized bed to dry powder materials that are prone to agglomeration or clumping, fluidization difficulties may occur in the feeding section with high moisture content. In this case, a stirrer should be installed in the feeding section to eliminate clumping problems and achieve normal fluidization. The latter is a combination of conduction heat transfer and convection heat transfer. When the amount of hot air used for normal fluidization is far from sufficient to meet the heating equipment heat required for drying, an internal heat exchanger is used to supply some or most of the heat, which can significantly save energy. There are various forms of internal heat exchangers. Fluidized beds are often used in combination with second and third stage dryers for drying.
oven
According to an authoritative survey report by a well-known Japanese beer merchant, the four stores in Dalinggang had a total customer flow of 5 million after 4 years of operation, including 3 million 'fan level' customers, almost one for every four to five Shanghai residents. Yes, we have no reason to doubt that Japanese survey data is based on their own commercial interests. On the other hand, looking at the lively dining state of the customers in the restaurant, it seems that it is a psychological problem of oneself. ”
Therefore, for domestic users, choosing domestic equipment is more convenient than choosing imported equipment. In terms of the international market, China's accession to the WTO is more conducive to expanding the export of drying equipment. At present, the main export products of drying equipment in China are vacuum drying equipment, vibration drying equipment, and drying equipment for small and medium-sized grain, food, and agricultural and forestry specialty products. The annual export volume exceeds 100 units, and the main export regions are Southeast Asia and other developing countries, and the door to the European and American markets has been opened. At present, the export products of drying equipment in China account for less than 5% of the total domestic drying equipment. It is expected that during the "15th Five Year Plan" period, the proportion of export products in the total domestic drying equipment will reach more than 10%.
In international competition, the main competitors of drying equipment manufacturers in China are Denmark, Switzerland, the United Kingdom, Germany, the United States, and Japan. Compared with competitors, the advantage of heating equipment in China's drying industry is its low price. The main shortcomings lie in the need to further improve the automation control level, appearance quality, completeness, and functional combination of the products.
Therefore, domestic drying equipment manufacturers should fully utilize the opportunity of China's accession to the WTO, strengthen technical exchanges with foreign countries, draw on the strengths of advanced drying equipment from abroad, accelerate the improvement of the automation control degree, appearance quality, completeness, and functional combination of China's drying equipment self heating equipment, narrow the gap with foreign products, improve the trust of China's products among users, and enable China's drying equipment to not only dominate the domestic market but also the foreign market.
