Coal Dryer
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- Desulfurization gypsum dryer can be customized according to requirements
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- Dryer length: 8 meters to 36 meters.
Coal Dryer
A coal drying machine is a device used to dry coal. Coal extracted from the ground contains a certain amount of moisture. The coal drying machine can dry the coal to a moisture content below 13% without altering the quality of the coal. The rotary coal drying machine uses a rotary design and can use various energy sources, such as steam, natural gas, coal, oil, and biomass, to dry the coal.
The coal drying machine operates based on heat conduction and mass transfer. The overall process involves heating, evaporation, and moisture removal.
Feeding: The crushed coal is fed into the dryer by an automatic feeding system.
Raising and Drying: Inside the rotary drum of the coal drying machine, lifting blades stir the coal. At the same time, hot air continuously enters the drying machine and comes into full contact with the coal, achieving the drying effect. The drying temperature is generally set between 600-800°C.
Dust Removal: During the drying process, large amounts of water vapor and dust are produced. The dust removal system continuously collects the water vapor and dust, achieving an environmentally friendly effect.
Discharge: The dried material is discharged automatically through the automatic discharge system.
The internal design of the coal drying machine is sealed to ensure that the heat source does not leak out, improving drying efficiency.
| Model | Capacity (T/D) | Initial Moisture (%) | Final Moisture (%) | Total Power (kW) | Area (m²) | Remarks |
|---|
| DDHG1924 | 300±10 | 40±5 | 20±2 | 128 | 8m * 35m | — |
| DDHG2226 | 500±10 | 40±5 | 20±2 | 165 | 8m * 40m | — |
| DDHG2528 | 700±12 | 40±5 | 20±2 | 213 | 8m * 40m | — |
| DDHG2832 | 1000±15 | 40±5 | 20±2 | 310 | 8m * 45m | — |
| DDHG3136 | 1500±20 | 40±5 | 20±2 | 446 | 10m * 50m | — |
| DDHG3440 | 2000±30 | 40±5 | 20±2 | 658 | 12m * 60m | — |
Why is Coal Drying Necessary?
Coal extracted from the earth is mostly used for electricity generation. The moisture content of coal greatly affects its combustion rate. Drying can effectively remove moisture and significantly increase the heating value of coal, allowing it to release more energy during combustion.
Reduced Weight: After drying, the coal’s weight is significantly reduced, making it easier to transport and store.
Applications in Other Industries: Lower moisture content in coal is essential for industries like coal chemistry (e.g., coking, gasification, liquefaction), where specific moisture content is required. Drying is an essential process to meet these requirements.
Improved Efficiency: Coal with excessive moisture is difficult to burn fully in boilers and kilns, producing waste and potentially damaging equipment. Dried coal burns more efficiently and thoroughly.
Applications of Dried Coal
Dried coal is a high-quality source of thermal coal, which can be used in power plants and boiler combustion. It is also used as a raw material for coking coal, where moisture content is crucial. Low-moisture coal is a key prerequisite for producing high-quality coke. Dried coal can also be used in modern coal chemical projects like coal-to-gas and coal-to-liquid processes, which have strict purity and moisture content requirements.
Our Special Design for Coal Drying Machines
Coal is highly flammable, produces a lot of dust, and is dense. Therefore, we have designed our coal drying machine with special features to address these characteristics:
Full Self-ignition Prevention Design: The coal drying process uses intelligent control to precisely regulate the drying temperature, avoiding excessive heat that could lead to oxidation or combustion of the coal. Key components are equipped with explosion-proof valves to ensure safety.
Unique Material Lifting System: The material forms an even curtain inside the drum, eliminating dead zones and improving heat exchange efficiency by over 30%. Special components are made of wear-resistant steel to extend the service life of the coal drying machine.
Intelligent Operation: The system is fully controlled by PLC, allowing for real-time monitoring of parameters such as temperature, humidity, and rotation speed. It supports one-touch start/stop and fault alarms, reducing the need for manual operation.