Lignite
1. Material Overview
Lignite, also known as wood coal, is the lowest grade of coal. It is a brownish-black, dull, low-grade coal, falling between peat and bituminous coal. It is highly chemically reactive, easily weathers in air, is difficult to store and transport, and causes severe air pollution when burned.
2. Process Introduction
The drying system uses steam rotary dryer for drying of lignite. As the cylinder rotates in the dryer, the materials are lifted and scattered by the heating tubes. The materials are dried by convection, conduction, radiation and other heat exchange methods. The materials move from the higher end to the lower end with the help of the slope of the dryer, and are finally discharged by the rotary discharge valve at the tail of the dryer. At the tail discharge end of the dryer, there is an adjusting weir plate for adjusting the filling rate of the material in the cylinder. Combined with the slope and speed of the cylinder, the requirements of the residence time, filling rate and output of the material drying can be met.
3. Technical Advantages
1) High-efficiency heat transfer mechanism + optimized structural design
Utilizing the dual heating system of heat transfer by heat coil inside the cylinder and hot air convection assistance, resulting in high heat utilization. Customized components inside the cylinder ensure even material distribution and enhanced material agitation thorough heat transfer without dead zones. Parts in contact with feedstock are provided with polished stainless steel, providing excellent sealing performance and reducing material leakage and residue.
2) Precise automatic control + stable operation
Integrated PLC for full-process automated control, supporting preset and automatic adjustment of parameters such as feed rate, steam pressure, and cylinder rotating speed. Real-time monitoring of cylinder temperature, material moisture content, and system pressure, with temperature control accuracy reaching ±3℃, ensuring stable and reliable operation suitable for continuous large-scale production.
3) Environmentally friendly + dust control
Uniformly distributed material, Combined with cyclone and bag filter dust collection system, fine powder recovery rate can reach more than 90%, meeting environmental emission requirements. Optimized wind speed design can reduce exhaust gas treatment load, minimizing investment and maintenance costs for environmental protection equipment.
4. Technical Benefit
1) Controllable investment costs
The equipment has mature and compact structure, and it is adaptable to different production capacity needs with competitive civil engineering and installation costs.
The exhaust gas treatment system only require small-size dedusting equipment, resulting in overall investment lower than traditional high-efficiency drying equipment and flexible options in expansion and modification for the future demand.
2) Optimized operating energy consumption
The design adopts primarily with conduction heat transfer and supplemented by convection, and it can reduce steam consumption by 15%-25% compared to hot air drying only;
The cylinder operates at low speed, resulting in low fan load and significantly lower power consumption than airflow drying equipment, greatly reducing steam and electricity costs.
3) Superior product quality
Polished stainless steel contact surfaces prevent material contamination, ensuring product purity. The gentle drying method can avoid thermal degradation of materials, maintain the original color and properties of the product (such as whiteness and activity), so as to meet high industry standards and enhance market competitiveness.
4) Strong adaptability + convenient operation and maintenance
The equipment can process various forms of material such as granule and powder, and it is highly adaptable to fluctuations in material moisture content.
The equipment has fewer vulnerable parts, facilitating simple maintenance and repair, short downtime, ensuring production continuity and reducing operation and maintenance costs.