<p>Under the unchanged condition of the quality of dried lignite, lignite dryer adopts low temperature four class drying process to make the moisture content of lignite evaporated below 13%. Lignite coal dryer, also known as lignite rotary dryer or coal ash dryer,is suitable for granular materials and can also be partially put intodry adhesive materials, pasty materials or high water content materials. It is widely used in the drying of materials in cement, mining, building materials, chemical, food, fertilizer production industry, etc. What are the<a href="http://www.ft-dryer.com/products/Lignite-coal-dryer.html"> principle and design concept of lignite coal dryer</a> ?</p><p style="text-align: center;"><a href="http://www.ft-dryer.com"><img src="http://www.ft-dryer.com/fckfiles/heimei-13.jpg" alt="coal dryer" width="500" height="450" /></a><br /></p><p>Principle: Lignite, coal ash and other material are sent into feeder through conveyor belt, and the coal ash is sent into drying roller through the feeder. With the ruffle of uniformly distributed board device in drying roller, the coal ash is evenly contacted with hot air to transfer heat and perfect drying. The dried coal ash is discharged into finished products via shedder in the end of the roller. The dried products are discharged by the belt discharging machine, and the drying process is finished.</p><p>Design concept : The concept was to dry lignite using a combination of direct and indirect heating, before it is burned in the power plant boiler.  Using waste heat from the power plant we were able to dry the coal raising its heating value which in turn makes the power plant operate more efficiently. Overall, the process lowered the customer"s nitrogen oxide (NOx) by 20%, sulfur dioxide (SO2) emissions by 35% and significantly reduced the carbon dioxide (CO2) and mercury as well as their overall maintenance costs.  Over 400,000 tons of lignite coal has been processed through the prototype with no significant operating or maintenances issues.</p><p>The U.S. Department of Energy (DOE) and Great River Energy are testing a new coal-drying technology that could dramatically reduce the emissions of lignite-burning power plants. The project was selected for funding during Round I of the DOE’s Clean Coal Power Initiative (CCPI), a series of competitions to demonstrate a range of promising clean-coal technologies. </p><p>slag dryer: http://www.fut-china.com/p-19.html</p>