Lignite dryer's brief introduction:
Lignite, coal or wood, it is the lowest degree of coalification coal mining. A dark brown between peat and bituminous coal, matt lean coal. Because it is rich in volatile, so it is easy to burn and smoke. On the profile can clearly see the trace of the original wood. Containing humic acid soluble in alkali. Carbon content 60% ~ 77%, density of about 1.1 to 1.2, the volatile component is greater than 40%. No glue layer thickness. Calorific value is about 23.0-27.2 million kilojoules/kg (5500-6500 kcal/kg). More brownish or brown-black, relative density 1.2 ~ 1.45.
Lignite drying machine technology
Previous mechanical dehydration, drying methods generally USES centrifugal equipment is expensive, low capacity, dehydration rate is small, usually only a precipitation by around 10%. The remaining 15-20% of water content. Rotary dryers, lignite adopted scatter lignite broken first and then thermal drying of new technology, make the material drying process to realize the continuous, industrialization and automation. Wet the moisture of lignite after lignite drying process can be reduced from 25% ~ 30% to below 13%, used as fuel coal, improve the coal preparation technology, has a good economic benefit, social benefit and environmental benefit. Rotary lignite dryer, to guarantee the quality of the same by drying lignite, under the condition of low temperature level 4 drying process, the brown coal moisture evaporates to water cut less than 13%. Primary drying area under high humidity condition by 400 ℃ high temperature to remove most of the water, to ensure the lignite chemical composition does not change and not easy to burn; Secondary drying area at room temperature to 300 ℃, through WenJiangLi lead wind high in addition to water, to ensure that the coal coking; Level 3 indoor temperature 120 ℃ to 210 ℃ drying area, using the crushing plant inside the drum, repeated impact, scattered material, downstream drying; Level 4 drying area for high exhaust area, room temperature 60 ℃, 80 ℃, by lead the wind system of negative pressure low temperature heat flow out water.