The overall requirements are high thermal efficiency, low energy consumption, simple configuration, convenient control, small floor space, and safe and hygienic operating environment. At present, the drying equipment commonly used in the inorganic salt industry is: rotary tube dryer, rotary indirect heating dryer, disc continuous dryer, air flow dryer (also divided into pulsed airflow, airflow rotation, positive and negative pressure secondary airflow drying) ), rotary flash dryer, rotary drum dryer, spray dryer (also divided into granulation, powder, centrifugal, pressure), vibrating fluidized bed dryer, static vacuum dryer, hot air circulation oven, 耙, paddle type vacuum dryer, boiling dryer (horizontal, vertical) and so on.
These drying equipments guarantee the quality of the products, but there are problems with the exhaust gas collecting dust. Due to the increasing number of nano-scale products, the original particle size is getting finer and finer, the potential water content of the paste material is increasing, and the enterprise is constantly developing towards large-scale and large-scale, and the company is eager to combine drying equipment. In particular, some large-tonnage products, such as precipitated calcium carbonate, currently have a production capacity of more than 3 million tons, a small production line with an annual output of 10,000 tons, a 100,000-ton scale with five sets of drying equipment, and a Guangxi enterprise planning to get 500,000 tons. According to the current level of drying equipment, regardless of the floor space of the equipment or the exhaust gas after the product is dry, the amount of "dust" is very large.
According to the current pulse bag filter commonly used in the industry, the operating environment is very harsh and must be taken to solve the problem. Therefore, we hope that the equipment development unit will focus on solving two problems, one is the drying problem of the paste-like fine objects with high water content, and the other is the industrial hygiene problem of the exhaust gas after the objects are dry. Still taking the calcium carbonate industry as an example, more than 200 enterprises in the country basically use rotary indirect heating dryers, disc continuous dryers, rotary tube dryers, etc. in the selection of drying equipment, although the production efficiency is satisfied, energy consumption And the tail gas collection "dust" is not ideal, a calcium carbonate enterprise, from the ground to the roof are covered with a layer of white calcium carbonate powder, even in the office desk and chair is a layer of white, this aspect has management problems More importantly, the exhaust gas after the drying is not closed. ^ Nearly this industry introduced the dust removal equipment produced by DuPont of the United States, which basically solved the problem.
Therefore, the combined drying equipment should include: providing heat source equipment, first and second stage drying equipment, tail gas collection "dust" equipment, etc. It is hoped that equipment manufacturing and research units will make a fuss about high thermal efficiency, low energy consumption, simple configuration, and convenient control. Make a fuss about combined drying equipment, serve others, and develop yourself. If the drying problem of the calcium carbonate industry is solved, the equipment is efficient and environmentally friendly, and the drying problems of other varieties are solved.
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