Abstract

Supercritical water gasification is a promising technology for pollution treatment and syngas production from biomass. The produced gas is composed of hydrogen, carbon dioxide, methane, carbon monoxide and traces of ethane and other light hydrocarbons. This work aims to give a comprehensive experimental study of the supercritical water gasification of glycerol using a full factorial design of experiments (DOE). The effect of five factors, namely: temperature [458 °C–542 °C], residence time [40–90 min], pressure [23–27MPa], initial concentration of glycerol [10–19wt%] and KOH catalyst quantity [0.60–1.475 wt%], were investigated on several responses such as the gasification efficiency (GE), syngas composition and lower calorific value (LCV) of the produced gas. First order mathematical models correlating each considered response in terms of the considered factors were developed and validated. Also, the significance of the factors effect was validated using analysis of variance. The results showed that the produced gas composition and quality were strongly influenced by temperature and initial concentration. The largest gas production was detected at a temperature of 542 °C, a residence time of 40 min, a pressure of 27 MPa, a concentration of 10 wt% glycerol and a KOH catalyst percentage of 1.475 wt%.

摘要

超临界水气化是一种很有前景的污染处理和生物质合成气生产技术。产生的气体由氢气、二氧化碳、甲烷、一氧化碳和痕量的乙烷和其他轻烃组成。本工作旨在使用全因子实验设计 (DOE) 对甘油的超临界水气化进行全面的实验研究。五个因素的影响，即：温度[458°C–542°C]、停留时间[40–90 min]、压力[23–27MPa]、甘油初始浓度[10–19wt%]和KOH催化剂用量[ 0.60–1.475 wt%]，对几种响应进行了研究，例如气化效率 (GE)、合成气组成和产出气体的低热值 (LCV)。开发并验证了根据考虑的因素关联每个考虑的响应的一阶数学模型。此外，使用方差分析验证了因素影响的显着性。结果表明，产生的气体成分和质量受温度和初始浓度的强烈影响。在 542 °C 的温度、40 分钟的停留时间、27 MPa 的压力、10 wt% 的甘油和 1.475 wt% 的 KOH 催化剂百分比下检测到最大的气体产量。