Lignite is geologically younger than higher-grade coal, and is more accessible because veins are relatively close to the surface, eliminating the need for underground excavation. Surface mining also eliminates the risk of methane or carbon monoxide buildup, which is a primary safety concern in underground mining. Lignite can contain up to 55% water, and this water must be evaporated to make lignite usable as fuel. The classical lignite drying technique involved recirculating hot flue gases through the coal pulverizers, and the steam thus generated was conveyed to the boiler along with the coal dust.
(1), environmental protection and energy and reducing loss of lignite. Improve the calorific value of brown coal, desulfurization, reduce volatile.
(2), investment, small footprint, supporting civil works less.
(3), reliable, simple operation, convenient maintenance, safe and durable.
(4), dry and moisture control, the minimum up to 5% or less, meet the material widely.
(5), even temperature drying process to ensure the quality of lignite change.
(6), continuous work, large capacity.
A drying area under the humidity high temperature at 400 degrees to remove most of the water, to ensure that the chemical composition of brown coal does not change and difficult to burn; Two dry area at room temperature 300 degrees, wind through the high temperature and strong lead in addition to water, to ensure Brown does not coking; Three indoor temperature drying zone 120 -210 degrees, using the broken roller device, repeated impact, dispersed materials, downstream drying; Four drying area for the high exhaust area, room temperature 60 -80 degrees, cited by negative pressure ventilation system was ruled out at low temperature hot water flow.
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