Brown coal is an important energy and chemical raw material. However, high moisture (20% -55%), low calorific value (2700 kcal or so) and spontaneous combustion result in low selling price and poor sales. So, governments and research institutions pay more and more attention to development and utilization of brown coal. Brown coal dryer enters the market under such a situation.
Principle of brown coal dryer
Brown coal dryer adopts low temperature and four grades drying process to evaporate the moisture of brown coal lower than 13%. In the first drying area, most moisture is removed at 400℃.No change of chemical composition and no combustion at this stage. In the second area it is 300℃. Strong airflow removes moisture and ensures no coking. In the third area, it is 120℃-210℃. Crushing device strikes and breaks brown coal repeatedly. In the fourth area, it is 60℃-80℃. Dried coal gets discharged at the outlet of brown coal dryer.
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