鼓泡流化床垃圾衍生燃料富氧气化

Enriched-air gasification of refuse derived fuel in bubbling fluidized bed

在鼓泡流化床上进行两种垃圾衍生燃料(RDF)的富氧气化试验,考察了RDF的热重特性并分析了气化温度、当量比及富氧浓度对气化特性的影响。结果表明:两种RDF均由纤维素及塑料类组分构成。随着温度由650℃升高至800℃,两种RDF产气的H2、CO及CH4浓度均逐渐增加,产气热值和气化效率同时提高。当量比增大时可燃组分浓度先略有增大后逐渐减小,但气体产率不断增大。RDF1及RDF2分别在当量比为0.22及0.27处达到最佳气化效率。富氧气化可有效改善气化品质,提升合成气热值,富氧浓度为45%时RDF1及RDF2合成气热值均达到最大,分别为8.6 MJ·m-3及9.2 MJ·m-3。

Enriched air gasification of two different refuse derived fuels （RDF） was performed in a bubbling fluidized bed reactor. Thermo-gravimetric analysis of the two RDFs was performed and the effect of temperature, equivalence ratio （ER） and oxygen percentage of enriched air was investigated. Both RDFs were composed of cellulose and plastics based materials. With increasing temperature from 650℃ to 800℃, concentrations of H_2, CO and CH_4 increased in both RDFs gasification. Gas yield and gasification efficiency were also improved. The combustible components first increased slightly and then decreased with increasing ER, while gas yield kept constant growth. The optimum ER values for RDF1 and RDF2 were 0.22 and 0.27 respectively for obtaining the highest gasification efficiency. The use of enriched air could improve gasification effectively and lead to higher heating value of the syngas. When oxygen percentage of enriched air was 45%, the maximum low heating values of the syngas for RDF1 and RDF2 were 8.6 MJ · m^-3 and 9.2 MJ · m^-3 respectively.