Elucidating the Solid, Liquid, and Gaseous Products from Batch Pyrolysis of Cotton Gin Trash

摘要

Cotton gin trash (CGT) was pyrolyzed at different temperatures (500°C, 600°C, 700°C, and 800°C) using an externally heated batch reactor. The average yields of output products (solid/char, liquid/bio-oil, and gas) were determined. The heating value (HV) of CGT was measured to be around 15.5 MJ kg -1 . Gas yield increased while char yield decreased as temperature was increased. The maximum char yield of 38 wt% was obtained after 30 min of pyrolysis at 500°C. The char had the largest fraction of the energy output (44% to 51%), followed by gas (6% to 15%) and bio-oil (4% to 5%). The maximum gas yield of 35 wt% was observed at 800°C. The average yield of CO, H ₂ , and total hydrocarbons (THC) generally increased with increased temperature, while CO ₂ production decreased. Methane, ethane, and propane were the dominant constituents of the THC. The highest bio-oil yield of about 30 wt% was observed at 600°C. The HV of bio-oil was low (2 to 3 MJ kg -1 ) due to minimal non-hydrocarbon compounds and high moisture content (MC). The heating value of the organic portion of the bio-oil was measured to be 6.1 MJ kg -1