Product Introduction

Single-Rotor Pyrolysis Furnace (also known as: Oxygen‑Free Pyrolysis Rotary Kiln, Continuous Rotary Carbonization Furnace, Oxygen‑Free Pyrolysis Rotary Kiln, Rotary Pyrolysis Furnace Kiln)

The monolithic rotary pyrolysis furnace independently developed by Jufeng Technology features a horizontally or slightly inclined, slowly rotating, sealed cylindrical furnace body. Feedstock enters continuously from one end and, under the rotational action of the furnace, is constantly tumbled, scattered by lifting paddles, and uniformly mixed while advancing forward. Throughout this process, the material is heated—either indirectly or directly—in an air‑isolated environment, undergoing volatilization and thermal decomposition reactions. The resulting residual ash is continuously discharged from the tail end into the cooling system, where the high‑temperature pyrolysis products are cooled to a safe temperature before being expelled from the unit.

The inner wall of the pyrolysis furnace is equipped with a propulsion screw and multiple lifting vanes, allowing materials to be advanced through the rotation of the rotary kiln’s horizontal angle or the screw blades within the rotating drum. The heating method employs external furnace tube heating, with heat sources including oil heating, gas heating, and electric heating (resistive heating, electromagnetic induction heating, microwave heating), among others. The rotational speed of this pyrolysis furnace can be adjusted between 1 and 10 revolutions per minute, while the residence time of the materials can be set within a range of 40 to 100 minutes.

The rotary anaerobic pyrolysis furnace utilizes a rotating furnace body, nitrogen protection, a sealing system, external heating, and a cooling system—among other structural designs—to achieve the thermal cracking and resource recovery of organic waste under oxygen‑free conditions. It is an efficient and environmentally friendly thermal treatment technology. The related technology has been applied in multiple industrial projects and boasts strong engineering maturity and significant potential for widespread adoption.

Brief Workflow Description

1. Feeding: The pre‑processed materials (such as crushed waste, sludge, and biomass) are fed into the front end of the rotary kiln via a sealed feeding device.

Sealed Feeding: Pre‑processed materials (such as shredded waste, sludge, or biomass) are continuously fed into the high end of the rotary kiln via dedicated sealing devices (such as star feeders or screw feeders), ensuring that the system remains isolated from ambient air.

2. Pyrolysis: The furnace body rotates slowly, and the material is continuously lifted and scattered by the lifting plates (material‑raising plates on the inner wall), forming a “waterfall” effect that ensures thorough and uniform contact with the heated surface.

Rotation and Transmission:

• The furnace body is installed at a slight angle (typically 1–3 degrees) and rotates slowly under motor drive (with adjustable speed, usually ranging from 0.5 to 5 RPM).
• The inner wall of the furnace is typically fitted with lifting plates that scoop up the material as the drum rotates, then allow it to cascade down like a “waterfall” once it reaches a certain height.

3. Heating: The heat source—high‑temperature gas, electric heating, or synthetic gas from combustion—flows through the jacket outside the furnace body, indirectly heating the material via the furnace wall (this is the most common and cleanest method).

Anaerobic pyrolysis:

• Heat is transferred to the material via indirect heating—this is the most common and environmentally friendly method. In this process, a high‑temperature heat source (such as combustion flue gas or an electric heater) flows through a jacket surrounding the furnace body, and the heat is conducted through the furnace wall to the material inside.
• As the material tumbles, it comes into full and uniform contact with the heated walls, gradually increasing in temperature until it reaches the target pyrolysis temperature (typically 450–600°C). In an oxygen‑free environment, the large organic molecules undergo cracking.

4. Slag Removal and Venting: After pyrolysis is completed, the solid residue (biochar) is discharged from the rear of the furnace. The pyrolysis oil and gas generated during the process are drawn off from the mid‑ or rear section of the furnace via exhaust ports and then fed into a subsequent condensation and separation system.

• Solid Products: After pyrolysis is completed, the solid residue (biochar) formed gradually moves toward the lower end under the influence of gravity and the rotation of the furnace, and is finally discharged through a sealed discharge device.
• Gaseous products: Volatile oil and gas generated during the pyrolysis process are drawn off from the exhaust ports located in the middle or at the tail end of the furnace, then fed into a condensation system where they are separated into liquid pyrolysis oil and gaseous syngas.

The rotary anaerobic pyrolysis furnace, with its outstanding mixing and heat transfer performance and broad feedstock adaptability, has secured an irreplaceable position in the field of solid waste resource utilization. It is particularly well suited for processing the following challenging materials:

1. Municipal sludge and industrial sludge perfectly address the characteristics of high viscosity and tendency to cake.

2. Complex municipal solid waste (RDF) can accommodate various components with different shapes and properties mixed within it.

3. Waste lithium batteries, waste tires, and waste plastics: Block‑shaped or sheet‑like materials can be evenly heated and decomposed within the furnace.

4. Biomass types, such as agricultural straw, forestry waste, and all other bio‑organic materials.

5. Hazardous Waste: Organic hazardous wastes such as oil sludge, oil‑contaminated metal chips, waste mineral oil, medical waste, and pharmaceutical residues can all be rendered harmless and recycled.

Schematic Diagram of a Single-Unit Rotary Pyrolysis Furnace

Device photo