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bce ›› 2017, Vol. 51 ›› Issue (5): 23-28.doi: 10.3969/j.issn.1673-5854.2017.05.004

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Steam Gasification of Sawdust-char for Syngas

JIA Shuang, YING Hao, SUN Yunjuan, SUN Ning, XU Wei, XU Yu, NING Siyun   

  1. Institute of Chemical Industry of Forest Products, CAF; National Engineering Lab.for Biomass Chemical Utilization; Key and Open Lab.of Forest Chemical Engineering, SFA; Key Lab.of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China
  • Received:2016-07-20 Online:2017-09-30 Published:2017-09-30

Abstract: Steam gasification of sawdust-char was studied in updraft fixed bed reactor to prepare syngas. The effects of temperature and steam flow rate on products distribution, char conversion rate, gas yield, gas composition and the ratio of H2/CO were investigated. The results showed that temperature had a positive effect on sawdust-char steam gasification, the maximum char conversion rate and gas yield of 99.2% and 4.16 L/g were obtained at 950 ℃. However, the increase of temperature would cause the decrease of H2 concentration from 65.8% to 61.2%. In the meantime, the ratio of H2/CO decreased from 10.3 to 3.35. Increasing steam flow rate could improve H2 concentration from 59.8% to 62%, but there was no change in gasification consequences with the steam flow rate higher than 0.6 g/min. In addition, the temperature of 900 ℃and the steam flow rate of 0.6 g/min were the optimum operating conditions, and the char conversion rate of 93.3% and gas yield of 4.06 L/g could be obtained. Furthermore, the ratio of H2/CO could arrive to 4.11, meeting the requirement of methanation.

Key words: sawdust-char, gasification, syngas, carbon conversion rate, H2/CO

CLC Number: