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Lignite Coal Rotating Dryer

Lignite Coal Rotating Dryer

Lignite Coal Dryer Specification

Production capacity: 0.4-103 t/h

Supported fuels: steam waste heat, fuel oil, blended fuels, natural gas, coal and other fuels.

Applicable materials: raw coal, coal slime, lignite, anthracite, steel slag, and other materials.

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Lignite coal, also known as brown coal, is a type of low-grade coal with a relatively low carbon content, typically ranging from 25% to 35%. It is usually obtained through open-pit mining, which keeps mining costs low. Compared to other types of coal, lignite coal has a higher moisture content, typically ranging from 20% to 70%, lower heating value, and higher ash and sulfur content. Therefore, it requires drying treatment before application.

Why We Should Lignite Coal Drying

Lignite coal, due to its high moisture content and low heating value among other unfavorable characteristics, is challenging to use in industrial applications. The comprehensive utilization of lignite coal has become an urgent issue. During the mining process, lignite coal is typically washed and exposed to open-air storage, resulting in high moisture content and easy agglomeration. Therefore, drying lignite coal is essential. Investing in the lignite coal drying industry not only brings significant economic benefits but also contributes positively to society by protecting the environment.

lignite coal

Increasing Heating Value: Drying reduces the moisture content of lignite coal, thereby increasing its heating value. This improves the combustion efficiency of lignite coal, reducing fuel consumption costs.

Improving Combustion Characteristics: Removing moisture improves the combustion characteristics of lignite coal, making it more combustible and stable, thereby reducing emissions during combustion.

Expanding Utilization: Dried lignite coal can be more widely used in energy production, industrial processing, chemical engineering, and other fields, enhancing its value and market competitiveness.

Reducing Transportation Costs: Dried lignite coal is lighter and smaller in volume, reducing transportation costs and energy consumption.

Buy Rotary Dryer for Lignite Coal Drying

Customers buy rotary dryers primarily for drying lignite coal, but they can also be used for drying raw coal, coal slime, bituminous coal, and other coal materials. Additionally, they are widely applicable in industries such as building materials, chemical engineering, and casting for drying materials like blast furnace slag, metal powder, limestone, aggregates, and sand, which are non-sticky and non-thermosensitive. AGICO’s lignite coal rotating dryer adopts a low-temperature four-stage drying process to ensure the quality of lignite coal remains unchanged, reducing its moisture content from the original 20%-70% to below 13%. This lignite coal dryer improves the utilization rate of lignite coal, generating substantial economic benefits while addressing issues such as land occupation and environmental pollution caused by lignite coal storage, thereby enabling more comprehensive utilization of lignite coal resources.

ModelVolume of the drum(m³)Capacity(t/h)Installation slope(%)Maximum intake temperature (℃)Main motor power(kw)Weight(t)

Outstanding Advantages of AGICO’s New Designed Lignite Coal Rotating Dryer

Buy Rotary Dryer for Lignite Coal Drying

Enhanced structural optimization for greater adaptability:

The lignite coal dryer features a newly designed internal structure that enhances its ability to clean and conduct heat to dispersed materials, eliminating sticking to the inner wall of the drum and improving adaptability to material moisture and stickiness.

The new type of support roller device for reduced wear:

Utilizing a “self-aligning support roller device,” the lignite coal rotary dryer ensures linear contact between the support roller and the rolling ring, resulting in zero horizontal thrust. This design significantly reduces wear on the supporting rollers, ensuring smooth and reliable operation of the drum.

Co-current drying for high thermal efficiency:

The rotating dryer adopts a co-current drying method, where the flue gas and wet materials enter the dryer from the same side. This setup allows for intense evaporation using high-temperature flue gas, leading to lower outlet temperatures of the dryer and consequently higher thermal efficiency.

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Lignite Coal Dryer Working Principle

Lignite Coal Dryer Working Principle

When the lignite coal dryer operates, wet materials are conveyed to the hopper by a bucket elevator or belt conveyor. From there, they are fed into the rotating dryer through a feeding device connected to the hopper. The slope of the feeding pipe should be greater than the natural inclination of the material to ensure smooth flow into the rotating dryer.

Materials are introduced from the higher end while the heat carrier enters from the same end, ensuring co-current contact with the materials. As the cylinder rotates, the materials move towards the lower end due to gravity. During this movement, the wet materials receive heat directly or indirectly from the heat carrier, facilitating drying.

Finally, the dried materials are discharged from the outlet end by a belt conveyor or screw conveyor. Inside the cylinder, there are paddles installed on the wall, which lift and then drop the materials, increasing the contact surface area between the materials and the airflow to enhance the drying rate and promote material advancement.

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