城市生活垃圾催化气化制取富氢气体的研究

采用下吸式固定床气化炉,以煅烧白云石为催化剂水蒸气气化城市生活垃圾(MSW)有机组分,在气化温度为750~950℃,S/M(水蒸气和垃圾物料进料质量比)为0.57~1.28时,探讨了催化剂种类、气化温度和S/M等因素对富氢气体成分、产氢率、潜在产氢率、低位热值和碳转化率等的影响。较高气化温度有利于富氢气体的生成,增加碳转化率和产气率,但会降低富氢气体的热值;在实验条件下,富氢气体中H2体积分数最高达53.29%,产氢率达到7.13~46.52mol/kg,潜在产氢率为55.48~90.11mol/kg;镍基催化剂催化效果优于煅烧白云石,能大幅增加H2含量,使焦油在850℃以上完全分解。

STUDY ON HYDROGEN-RICH GAS PRODUCTION FROM MUNICIPAL SOLID WASTE(MSW) BY CATALYTIC GASIFICATION

In the present study the catalytic gasification of MSW to produce hydrogen-rich gas in a laboratory scale using downstream fixed bed gasifier with calcined dolomite catalyst was investigated.The influences of the catalysts,gasifier temperature and steam to MSW ratio(S/M) on the gas composition,hydrogen yield,potential hydrogen yield,etc.were studied over the temperature range of(750)～(950 ℃),with steam to MSW ratio(S/M) in the range of 0.57～1.28.Over the ranges of experimental conditions examined,higher temperature favored higer H_2 content,and increased carbon conversion efficiency,gas yield,but decreased LHV of hydrogen-rich gas.The highest content of H_2 was 53.29%,hydrogen yield ranged from 7.13 to 46.52 mol/kg,and hydrogen potential yield varied from 55.48～90.11 mol/kg.Nickel-based catalyst and calcined dolomite revealed significant catalytic performance,and significantly increased H_2 content and completely decomposed tar.