Rotary kiln pyrolysis is a thermal decomposition process that takes place in a reducing atmosphere and at temperatures up to 950 °C, depending on the feedstock. It is used as a continuous reprocessing and disposal process for residues from the chemical and refinery sectors as well as for wastes from the industrial, municipal and recycling industries.
Based on the experiences from the 1930's and 1940's, when this type of pyrolysis was primarily used to increase the product yield of hydrogenation plants, VTA already in 1989 further developed this technology in an industrial pilot plant to demonstrate the continuous rotary kiln pyrolysis for new applications.
The use of the robust rotary kiln technology opens the possibility of treating virtually all types of waste and residues which are thermally decomposable, in particular from the oil and chemical industries, using the VTA LTC process (Low Temperature Carbonization). But it can also to process household waste, biological waste, scrap tires, shredder fines, sewage sludge, electronic waste and residues of renewable energy sources.
The main advantage of the technology lies in its high flexibility with regard to the operating parameters and its tolerance with regard to changing feedstock properties.
The core of the VTA LTC process is the indirectly heated rotary kiln reactor. In terms of thermal treatment conditions, it offers the possibility of flexible heat input for any required temperature profile by advanced temperature control methods.
Special features of the VTA LTC process are: