The effect of two pretreatment levels on the pyrolysis characteristics of water hyacinth
2020
Yao, Zhongliang | Ma, Xiaoqian | Xiao, Zhiyuan
The effect of two-level pretreatment on the slow/fast pyrolysis characteristics of water hyacinth were studied. The water/acid wash had the significant effect on remove the sulfur, nitrogen and ash, which can greatly improve the quality of pyrolysis products. water/acid wash had negative impact on the heavy oil in the hydrothermal system. The heavy oil yield of the Hy-R, Hy-W and Hy-A were 37.24%, 25.70% and 27.06 w/w %, respectively. Among all the pretreatments, except for K element, all the detected heavy metals (Al, As, Cr, Cu, Mn, Ni and Zn) accumulated. In addition, the CPI of Tr-R, and Tr-W and Tr- A were −23.91, −13.93 and −18.85 × (10⁻⁷/(min² × °C³) which were much larger than that of Hy-R, Hy-W and Hy-A (−2.99,-6.60 and −9.26 × (10⁻⁷/(min² × °C³)). The absorbance of NH₃, HCN, C=O, CO, CO₂, CH₄ and H₂O were detected in slow pyrolysis. The pyrolysis effectiveness index of Hy-R reached the largest value of 0.375. The volatiles of fast pyrolysis were divided into fourteen groups, including CO₂, alcohols, acids, phenols, aromatic hydrocarbons, esters, aldehydes, ketones, aliphatic & alicyclic hydrocarbons, nitrogen containing compounds, organo-sulfur compounds, sugars, ethers, furans to present the compositions of the pyrolysis vapors.
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