Pyrolysis is a process where organic materials are decomposed in the absence of oxygen. This process can be conducted at different heating rates, leading to two primary types: slow pyrolysis and fast pyrolysis. Understanding the heating rates for each is crucial for achieving the desired end products.
5 Key Differences Explained
1. Heating Rates
Slow pyrolysis typically involves heating rates between 1 and 30 °C per minute. Fast pyrolysis involves heating rates that can range from 100 to 10,000°C per second.
2. Temperature Range
In slow pyrolysis, the biomass is heated to temperatures around 500°C. Fast pyrolysis quickly heats the biomass to temperatures between 650 and 1000 °C.
3. Residence Time
Slow pyrolysis allows for longer residence times of both the solids and gases. Fast pyrolysis has very short residence times, typically less than one second.
4. Primary Products
Slow pyrolysis facilitates the release of tar and char as primary products. Fast pyrolysis maximizes the yield of bio-oil and gases.
5. Application Focus
Slow pyrolysis is ideal for producing high-quality biochars suitable for agricultural use. Fast pyrolysis is optimized for bio-oil and gas production.
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