Continuous Automatic Rotary Kiln Calcination With PID Temperature Control

Continuous automatic calcination rotary kiln with PID temperature control

1.Product Introduction Calcination Rotary Kiln

The Continuous Automated Calcination Rotary Kiln is an industrial-grade thermal processing system designed for high-temperature continuous material treatment. Its core structure comprises an inclined rotating steel cylinder, a refractory lining, a drive assembly, a combustion system, and an intelligent temperature control unit. Utilizing a PID closed-loop control system, the equipment achieves precise regulation of the calcination zone temperature. Combined with real-time feedback from multi-point thermocouples, it automatically adjusts fuel injection and combustion air volume to maintain temperature fluctuations within ±5°C. Designed for continuous feeding and discharging, it is ideal for high-thermal inertia and strongly non-linear processes, featuring auto-start/stop, fault alarms, and remote monitoring capabilities. It serves as critical equipment in modern cement, metallurgy, and chemical production.

2.Application Calcination Rotary Kiln

• Lime Production: High-efficiency calcination of limestone to produce active Calcium Oxide for steelmaking and environmental desulfurization.
• Metallurgy & Chemicals: Roasting of bauxite, calcination of petroleum coke, and thermal treatment of titanium dioxide and zinc suboxide.
• Environmental Disposal: Acting as the core of hazardous waste incineration systems to ensure complete organic decomposition and heavy metal stabilization.
• Material Recovery: Supporting the high-temperature activation and resource recovery of spent battery cathode materials and smelting slag.

3.Working Principle Calcination Rotary Kiln

• Thermal Isolation Conduction: Fuel burns completely within an independent combustion chamber. High-temperature flue gases never enter the material zone; instead, heat is transferred through the metallic inner cylinder wall primarily via thermal radiation, supplemented by convection, achieving "clean heating."

• Rotational Axial Transport: The inner cylinder rotates slowly (1–5 rpm). Driven by gravity and a cylinder inclination of 3–5°, the material moves at a constant speed from the feed end to the discharge end, ensuring uniform heating and complete reaction.

• Temperature Gradient Modeling: Based on one-dimensional heat conduction models, a multi-zone temperature control system manages the axial temperature distribution (Preheating, Calcination, and Cooling zones) to optimize reaction kinetics.

• Airtight Isolation Design: The inlet and outlet utilize multi-stage sealing structures (such as graphite seals or gas seals) to prevent ambient air infiltration or process gas leakage, maintaining a pure reaction environment.

4.Advantages Calcination Rotary Kiln

1. Material Transport & Heat Exchange
Material enters from the kiln tail and moves toward the kiln head driven by the cylinder's slow rotation and inclination. High-temperature gases are injected from the kiln head, making counter-current contact with the material. Heat is transferred efficiently through radiation, convection, and conduction.
2. PID Temperature Closed-Loop Control
• Proportional (P): Immediately adjusts the fuel valve opening based on the deviation between the setpoint and measured temperature.
• Integral (I): Eliminates cumulative steady-state errors over time to ensure long-term accuracy.
• Derivative (D): Counteracts sudden temperature spikes, preventing overshoot and oscillation to improve system stability.
3. Multi-point Thermal Feedback
Multiple K-type thermocouples are arranged axially along the kiln body to collect real-time data from the calcination, transition, and cooling zones. Data is processed by a PLC to drive actuators, forming a dynamic response loop.
4. Combustion Optimization
Combined with oxygen sensors and airflow control valves, the system achieves an optimal fuel-to-air ratio, enhancing combustion efficiency while reducing  emissions.

5.Technical Specifications

6.Our Solutions