3.5t/H 5.5t/H Calcination Rotary Kiln Sludge Industrial Dryer And Kiln

Rotary kiln for industrial sludge drying and calcination

1.Product Introduction Calcination Rotary Kiln

The Industrial Sludge Drying and Calcination Rotary Kiln is a high-efficiency thermal processing unit specifically designed for high-moisture and high-viscosity wastes, including municipal, industrial, and construction sludges. Featuring a horizontal rotating structure, the equipment achieves sludge drying, incineration, volume reduction, and resource conversion through high-temperature calcination. The kiln shell is fabricated from rolled steel plates and lined with high-grade refractory materials. Integrated with drive assemblies, combustion systems, sealing structures, and intelligent control systems, it ensures stable operation and high thermal efficiency. It is a core technology for the "Four-R" treatment goal (Reduction,Rendering harmless, Stabilization, and Resource recovery).

2.Application Calcination Rotary Kiln

• Municipal & Industrial Wastewater Treatment: Processing bulk wet sludge from urban WWTPs and industrial wastewater facilities to slash disposal costs.

• Hazardous Waste Co-processing: High-temperature detoxification of oily sludge, electroplating sludge, and pharmaceutical sludge.

• Soil Remediation: Removing organic pollutants and pathogens from contaminated soil through high-temperature calcination for land reuse.

• Building Material Valorization: Utilizing incinerated sludge ash to produce expanded clay pebbles (ceramsite), cement additives, or lightweight construction materials.

• Energy Recovery: Capturing thermal energy from sludge incineration for waste heat power generation or district heating.

3.Working Principle Calcination Rotary Kiln

1.Pre-treatment & Feeding: Sludge is first mechanically dewatered to a moisture content of 70%–85%, then further dried to 30%–35%. It is then continuously fed into the kiln inlet via a screw feeder.
2. Rotational Drying & Calcination: The kiln shell, inclined at 1°–3°, rotates at 1–5 rpm. Sludge tumbles continuously, ensuring maximum contact with high-temperature flue gases as it moves through drying, pyrolysis, combustion, and cooling phases.
3. Temperature Zone Control:

• Drying Zone (200–400°C): Evaporates residual moisture.
•  Pyrolysis Zone (400–700°C): Decomposes organic matter into combustible gases.
•  Calcination Zone (800–1,100°C): Completely incinerates organics, destroys pathogens, and decomposes harmful substances like dioxins.

4. Secondary Combustion (SCC): Flue gas from the kiln enters a Secondary Combustion Chamber, staying at >1,100°C for over 2 seconds to ensure complete oxidation of combustible components and compliance with emission standards.
5. Ash Discharge & Heat Recovery: Solid residues are discharged and cooled for reuse. Flue gas waste heat is recaptured to preheat combustion air or dry incoming sludge, optimizing energy efficiency.

4.Advantages Calcination Rotary Kiln

• High Capacity & Broad Adaptability: Capable of processing diverse sludge types (municipal, industrial, medical) with high tolerance for moisture and calorific value fluctuations.
•  Complete Incineration & Environmental Compliance: The combination of high-temperature calcination and a secondary combustion chamber ensures a destruction rate of hazardous substances >99.99%.
•  Energy Efficiency: Utilizing counter-current or co-current heat exchange and waste heat recovery, the system achieves a thermal recovery rate of >60%, significantly lowering fuel costs.
•  Advanced Automation: Equipped with an intelligent control system that regulates rotational speed, temperature, and airflow in real-time to guarantee operational stability.
•  Defined Resource Path: Converts waste ash into raw materials for construction, adhering to the principles of the Circular Economy.
•  Reliable Operation: Features advanced technologies like hydraulic thrust rollers and graphite seals, extending equipment lifespan and increasing the operational rate by over 10%.

5.Technical Specifications

6.Our Solutions