The yield of biochar in pyrolysis can vary depending on several factors.
These factors include pyrolysis temperature, heating rate, biomass feedstock, and residence time.
According to various studies, the yield of biochar was measured at different temperatures.
At 300 °C, the biochar production was 54%.
However, as the pyrolysis temperature increased, the biochar yield decreased.
At 500 °C, the biochar yield was measured as 29%.
It further decreased to 28% at 700 °C and 26% at 900 °C.
This shows a significant decrease in biochar production as the pyrolysis temperature increases.
Slow pyrolysis is often considered the most feasible production process for high-quality biochar intended for agricultural use.
In slow pyrolysis, biomass is heated in an oxygen-limited or oxygen-free environment.
Typical heating rates range between 1 and 30 °C per minute.
Under these conditions, biochar yields are usually up to 30 wt% on a dry feedstock weight basis.
The yield and properties of biochar are influenced by various factors.
These factors include the biomass feedstock, heating rate, pyrolysis temperature, and vapor residence time.
Among these parameters, the highest treatment temperature (HTT) has the greatest overall influence on the final product characteristics.
In summary, the yield of biochar in pyrolysis can vary depending on the pyrolysis temperature and other process conditions.
Slow pyrolysis is generally recommended for higher biochar yields, with typical yields up to 30 wt% on a dry feedstock weight basis.
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