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bce ›› 2017, Vol. 51 ›› Issue (5): 49-53.doi: 10.3969/j.issn.1673-5854.2017.05.008

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Characteristics of High-temperature Carbon Dioxide Gasification of Sawdust-derived Char

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

  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:2016-08-26 Online:2017-09-30 Published:2017-09-30

Abstract: The characteristics of carbon dioxide(CO2) gasification of sawdust-derived char were studied in high-temperature fixed bed reactor. The effects of temperature and CO2 flow rate on the volume fraction of gas compositions, low heating value(QLHV), gas yield, and solid yield were investigated. The results showed that with the temperature increasing from 750 ℃ to 950 ℃, the volume fraction of CO increased and that of CO2 reduced, and the QLHV of the fuel gas increased obviously, the change trend of QLHV was not obvious from 950 ℃ to 1 050 ℃. With the increase of CO2 flow rate, which was used as the gasification agent, the solid yield reduced, the gas yield increased, and the volume fraction of CO2 increased obviously, while the volume fraction of CO and QLHV increased firstly and then reduced. When the flow rate of CO2 was 15 mL/(min·g), the QLHV was up to the largest. The optimized conditions were the gasification temperature 950 ℃ and CO2 flow rate 15 mL/(min·g). Under these conditions,the volume fraction of CO was 51.51%, the volume fraction of CO2 was 37.99%, the QLHV was 8.03 MJ/m3, and the gas yield was 0.78 L/g.

Key words: sawdust-derived char, CO2 gasification, temperature, gas yield, heat value

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