Rotary dryers,Rotary kiln

Technical Advantages of New OSC-AST Desulphurized Gypsum Drying Calcining Equipment

Introduction
What are the technical advantages of new desulphurized gypsum calcining drying equipment launched by Taeda in 2020?
Desulphurized gypsum is sludge wastes produced by Alkaline scrubbing tower and its main ingredient is CaSo4. Because environmental protection is more and more strict and daily output of desulphurized gypsum is more and more (especially from coal thermal power plant). Traditional desulphurized gypsum drying machine is rotary drum dryer. Owing to change of heating method, steam, boiler exhaust heat and electricity are more and more considered by customers. Accordingly, external heating drying system appear, like steam dryer and electricity heating dryer, but these external heating drum dryer accounts for small market share. The reason is that manufacturing price of them are much higher than rotary dryer. Boiling calcining equipment is one small branch for gypsum calcining. It is mainly applied for calcining and dewatering of gypsum raw ore. But, owing to immature technology, it occupies pretty small market share.
  Rotary drum dryer occupies extremely high market recognition, but there are lots of obvious disadvantages, like high energy consumption, high pollution, large occupation area and poor adaptability. Desulphurized gypsum is a viscous material. Without proper disposal, common rotary dryer cannot reach drying and dewatering effect, let alone making gypsum product after calcining.
　Against this background, Zonelion Taeda introduces Air Swept Tube Dryer (OSC-AST Dryer) which can effectively solve drying difficulty caused by sticky materials. In addition, after upgrading and improvement, OSC-AST dryer can finish calcining and crushing task in one machine.


Working Principle of OSC-AST Dryer for Calcining Desulphurized Gypsum
OSC air swept tube dryer has two major steps while disposing desulphurized gypsum
1. Special structure efficiently finish drying aim and remove unbound water.
OSC air swept tube dryer is also called air swept rotary wing dryer. Turbine dispersing device speeds up dewatering process and unbound water can be removed quickly.

2. Flash boiling accomplish calcining task and get high quality products.
In rear part of OSC-AST Dryer, semi-dry gypsum presents flash boiling state. In terms of working principle, it is equal to “chamber boiling calcining furnace”. Difference is that residence time of calcining for OSC-AST dryer can be precisely controlled. OSC-AST Dryer can guarantee no over-burnt and light-burnt.
Above are working principle for desulphurized gypsum calcining in OSC-AST Dryer.
Is OSC-AST dryer mature technology? Will it be accepted by customers?

OSC-AST dryer belongs to new equipment in China, but it has been widely applied in the world. Customers can be assured that we have Pilot Center set in our manufacturing base. Before being launched to market, OSC-AST dryer has been tested in cold form and thermal form for many times. What’s more, we have done test for gypsum brought by customers. Initial setting time for caclined gypsum is 8min, which conforms to industrial standard. Besides, following features of OSC-AST dryer worth attention also.
Environmental Friendly, Cost effective and Efficient
Environmental protection has become a major problem focused by global. Desulphurized gypsum is product of environmental protection upgrading. Therefore, for OSC-AST dryer configuration in desulphurized gypsum, what should be considered first are environmental protection, cost and efficiency. The OSC-AST drying concept put forward by our company adopts environmental protection idea in every circle.
Large scale and Intelligence Work
OSC-AST dryer's new type of desulfurized gypsum calcining equipment is in line with the industry and the market to meet the needs of large-scale and modern thermal power plants. It is not a problem to process 10,000 tons of desulfurized gypsum per year. Moreover, under the design of our electrical department, the entire system is more intelligent, automatic, and more in line with current production needs.
Modularization and customization
As mentioned above, the heating method of the dryer has changed. Steam, boiler waste heat, and electric heating have also become one of the options considered by the owner. Therefore, we have carried out a modular disassembly of the entire drying and calcining system. The heat source is partly independent of modules. Users have multiple choices. Other modules can also be quickly disassembled, further shortening the installation and construction cycle.
Small body provides possibility for mobile work
　Skid-mounted is a popular way of equipment installation in recent years. Our modular design not only facilitates the skid-mounted layout, but also because of the short and powerful size of the OSC series, we can build a mobile trailer-type processing center for you. Take a ride in Jiuzhou!
 What do you think of our new type desulfurized gypsum calcining and drying equipment? Technology, price, highlights, which ones do you pay more attention to? Please call to discuss.
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