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Direct Fired Coal Dryer for Large Capacity Plants
1. Introduction
A direct fired coal dryer is a heavy-duty industrial drying system designed to process high volumes of wet coal in large-scale coal preparation and processing facilities. By bringing high-temperature combustion gases into direct, immediate contact with the wet coal stream, this dryer achieves rapid moisture evaporation and ultra-high processing capacities, making it an essential solution for industrial-scale dewatering.
2. Working Principle
The system relies on direct convection and high-intensity heat exchange:
Hot Gas Generation: A burner or hot air furnace combusts fuel to generate a high-temperature drying gas stream.
Direct Contact & Dispersion: Wet coal is fed continuously into the rotating drum, where internal flighting continuously lifts and showers the coal directly through the oncoming hot gas stream.
Rapid Evaporation: Moisture on the surface of the coal particles evaporates rapidly due to direct convective heat transfer as the coal travels down the drum.
Discharge & Dust Scrubbing: Dried coal exits continuously at the lower end, while exhaust gases carrying moisture and fine dust are processed through cyclone collectors and baghouses before release.
3. Key Advantages
Ultra-High Processing Capacity: Direct contact allows for extremely fast drying rates, easily accommodating large industrial throughputs from hundreds to thousands of tons per day.
Maximum Heat Transfer Efficiency: Eliminates intermediate heat exchange barriers, ensuring that the thermal energy from fuel combustion is used directly to evaporate moisture.
Cost-Effective Scalability: Simple and robust design allows large drum diameters that maximize production per unit of capital investment.
Flexible Fuel Compatibility: Modern burners can operate on natural gas, diesel, coal gas, or pulverized coal, reducing fuel sourcing costs.
4. Applications
Large-Scale Coal Washeries & CPPs: High-volume dewatering of washed coal products, flotation concentrates, and filter cakes.
Lignite Upgrading Plants: Rapidly drying low-rank, high-moisture lignite and sub-bituminous coals to raise calorific values at utility scale.
Power Plant Fuel Supply: Pre-treating high volumes of wet coal prior to pulverization to optimize boiler efficiency.
Coal Slurry & Tailings Reclaiming: Bulk processing of wet coal slurry and settling-pond tailings for blended industrial fuel.
Technical Specifications
Product Specs (m) |
Capacity(T/H) |
Main Motor Power |
Main Motor Mode1 |
Main Gearbox Model |
Ratio |
Weight (T) |
1.2x10m |
2.5 |
7.5 |
Y160M-R3 |
ZL50-16-1 |
13.5 |
|
1.5x12m |
3.3-4.9 |
10 |
Y160L-6B3 |
JZQ500-111-2F |
- |
18.9 |
1.5x15m |
4-6 |
18.5 |
Y200L-6 |
JZQ500-111-2F |
21 |
|
1.8x12m |
4-6 |
11 |
Y200L-6 |
ZQ50-1611-2 |
16.46 |
22.33 |
2.2x12m |
7-12 |
18.5 |
Y160L-6 |
JZQ650-111 |
31.5 |
37.6 |
2.2x14m |
7-12 |
18.5 |
Y160L-6 |
JZQ750-111 |
31.5 |
40 |
2.2x16m |
12 |
30 |
Y225M-6 |
JZQ750-11 |
31.5 |
45 |
2.4x14m |
12 |
30 |
Y250M-6 |
JZQ750-111 |
31.5 |
51 |
2.4x18m |
10-13 |
37 |
Y250M-6 |
ZL85-13-1 |
27.16 |
54 |
2.4x20m |
10-14 |
37 |
Y250M-6 |
ZL85-13-1 |
27.16 |
54.14 |
3x20m |
25 |
55 |
Y250M-4 |
ZL100-16-1 |
41.52 |
78 |
3x25m |
32-36 |
75 |
YR280M-4 |
ZL100-16-1 |
41.52 |
104.9 |
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