Oxygen Gasification of Municipal Solid Waste in a Fixed-bed Gasifier

• Published in: Chinese journal of chemical engineering 2014-09, Vol.22 (9), p.1021-1026
• Main Authors: Niu, Miaomiao, Huang, Yaji, Jin, Baosheng, Wang, Xinye
• Format: Article
• Language: English
• Subjects: Carbon dioxide; Combustion; Equivalence ratio; Flow rate; Garbage; Gas evolution; Gas flow rate; Gasification; Municipal solid waste; Oxygen gasification; Solid waste management; Temperature; Textiles; 固定床反应器; 固定床煤气化; 城市固体废弃物; 气体成分; 氧化; 演化特征; 炉内; 餐厨垃圾
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/j.cjche.2014.06.026

Four waste materials, paper, wood, textile and kitchen garbage, in municipal solid waste were gasified separately with oxygen in a fixed bed reactor. The yields of products char. tar and gas, the composition of gas components H2, CO, CO2 and CH4, and the lower heating value （LHV） were examined at temperatures between 700 and 900 ℃ and equivalence ratio （ER） between 0.14 and 0.32. Characteristics of gas evolution during gasification were inves- tigated. Results show that a higher temperature improves the formation of H2 and CO while lowers the yield of CO2 and CH4. The LHV of syngas increases with temperature and varies in the range of 6-10 MJ. m-3 reaching the maximum at 800 ℃ or above. As ER increases, both combustible gas component and LHV of syngas decrease while the yield of CO2 rises linearly. The appropriate ER for obtaining high quality gas is in the range of 0.18-0.23. Temperature and ER have significant effects on the product distribution. Higher temperature and ER are favorable for higher gas yield and lower yield of char and tar in the gasification of textile and kitchen garbage. At 800 ℃, the gas evolution may be divided into two regions. In the first region, the flow rate of gas increases and then de- creases ranidlv, while in the second reuion the flow rate decreases monotonically to lower level.