城市生活垃圾催化气化制取富氢气体的研究

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

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。

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 H2 content, and increased carbon conversion efficiency, gas yield, but decreased LHV of hydrogen-rich gas. The highest content of H2 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 H2 content and completely decomposed tar.