Drying equipment for lignite coal washing plant
June.19,2023
The lignite dryer adopts a low-temperature four-stage drying process to evaporate the lignite moisture to less than 13% while ensuring the quality of the dried lignite remains unchanged. The first-level drying zone removes most of the water at a high temperature of 400°C in a high-humidity state to ensure that the chemical composition of the lignite does not change and is not easy to burn; Lignite does not coke; the indoor temperature of the third-stage drying area is 120°C-210°C, and the crushing device in the drum is used to repeatedly hit and disperse the materials, and the material is dried downstream; the fourth-stage drying area is a high exhaust area, and the room temperature is 60°C -80°C, the water is removed by the low-temperature hot air flow with negative pressure in the induced draft system.
The brown coal dryer is composed of a heat source system lignite furnace, a feeding system, a conveyor, a hopper, an electric control system, a drying system, a cyclone dust collector, a bag dust collector, and a discharge system.
technical features
1. The lignite dryer has strong overload resistance, large processing capacity, low fuel consumption and low drying cost;
2. The downstream drying method is adopted, the flue gas and the wet material enter the dryer from the same side, and the high-temperature flue gas can be used to obtain high evaporation intensity, the outlet temperature of the dryer is low, and the thermal efficiency is high;
3. The operating parameters can be changed according to different material properties, so that the material can form a stable full-cut fabric curtain in the dryer cylinder, and the mass and heat exchange is more sufficient;
4. The new feeding and discharging device eliminates the phenomenon of clogging, discontinuity, unevenness and returning material of the drum dryer, and reduces the load of the dust removal system;
5. The new internal structure strengthens the cleaning and heat conduction of the dispersed materials, eliminates the sticking phenomenon on the inner wall of the cylinder, and has stronger adaptability to the moisture and viscosity of the materials;
6. The lignite dryer realizes “zero horizontal thrust”, which greatly reduces the wear of the supporting wheel, and the cylinder runs smoothly and reliably;
7. The lignite dryer adopts the “alignment supporting wheel device”, so that the cooperation between the supporting wheel and the rolling ring is always in linear contact, thus greatly reducing wear and power loss;
8. The particle size and water content of the product can be controlled according to user requirements. When drying coal slime, the product water content can reach below 8%, and the particle size can be controlled below 8mm.
