There are several types of reactors used in pyrolysis:
1. Fluidized bed reactor: This type of reactor consists of a vessel with a layer of bed material, such as sand, at the bottom. A flowing fluid, usually pure nitrogen, is introduced under pressure to prevent unwanted reactions. Heat transfer is carried out by the bed material, which efficiently transfers heat to the substrate undergoing pyrolysis.
2. Fixed bed reactor: In a fixed bed reactor, the biomass is placed in a chamber and heated from the outside. As the decomposition takes place, the volume of the ingredients increases, and the resulting gases and bio-oil leave the system while biochar remains in the reactor.
3. Vacuum reactor: A vacuum reactor operates under reduced pressure, which helps to lower the boiling point of the biomass and enhance the pyrolysis process.
4. Circulating fluidized bed reactor: Similar to a fluidized bed reactor, a circulating fluidized bed reactor also contains a layer of bed material. However, in this type of reactor, the bed material is continuously circulated, allowing for better control of the pyrolysis process.
5. Ablative reactor: An ablative reactor involves the use of a rotating drum or cylinder with a high-speed blade or scraper. The biomass is fed into the reactor, and the blade or scraper removes the pyrolyzed material from the reactor surface.
6. Rotary kiln reactor: A rotary kiln reactor consists of a long, rotating cylinder where the biomass is heated as it moves through the reactor. This type of reactor is suitable for continuous pyrolysis processes.
7. Drum reactor: A drum reactor is a simple design where the biomass is loaded into a drum and heated to initiate the pyrolysis process.
8. Tubular reactor: In a tubular reactor, the biomass flows through a series of tubes, where it is heated to undergo pyrolysis.
9. Heinz retort: The Heinz retort is a type of reactor that is specifically designed for the production of biochar. It operates under a controlled oxygen environment, allowing for the production of high-quality biochar.
These are just some of the common types of reactors used in pyrolysis. The choice of reactor depends on factors such as the desired products, process efficiency, and scalability.
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