煤与垃圾衍生燃料单一流化床两步法气化工艺研究  

Study on Two-step Gasification Process of Coal and Refuse Derived Fuel in the Single Fluidized Bed

作　　者：王立群[1] 马亮 WANG Liqun;MA Liang(College of Energy and Power Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《重庆理工大学学报（自然科学）》2021年第11期240-246,共7页Journal of Chongqing University of Technology：Natural Science

基　　金：科技部科技支撑项目(2015BAD21B06)。

摘　　要：为避免富氧气化过程氧气制备所带来的高额成本以及空气气化过程N_(2)组分对产气热值的稀释,提出一种新型单一流化床两步法气化工艺。过程由燃烧和气化2个阶段交替运行,燃烧阶段以煤料为发热体及热载体,气化阶段改投垃圾衍生燃料(RDF)进行水蒸气气化反应。对过程气化特性分析发现:该工艺可以有效制备中热值的富氢燃气,并且随着温度(T)升高,燃气组成中的H_(2)及CO均以不同速率呈增长趋势,同时气体产率及气化效率也有所增加,但热值呈下降趋势;随着水蒸气与RDF投料质量比(S/R)的增加,H_(2)组成呈上升趋势,产氢率和潜在产氢率也持续增长,但CO和CH_(4)组分占比不断减小,并且由于焦油及烷烃类气体挥发分分解,产气热值呈下降趋势,但气体产率不断增加,综合计算其过程气化效率从54.49%增加至74.30%。通过全面分析,确定最佳气化温度区间应为950~1000℃,最佳S/R应为1.7。A new type of two-step gasification technology in the single fluidized bed was proposed to avoid the high cost of the Oxygen preparation in the Oxygen-enriched gasification process and the introduction of N 2 components in air gasification process.The whole process was carried out alternately by the combustion stage and gasification stage.The coal was used as heat element and heat carrier in the combustion stage,and the refuse derived fuel(RDF)was used as the gasification raw material for the steam gasification characteristic research.It showed that the hydrogen-rich gas with medium calorific value could be prepared by this process effectively.As the increase of gasification temperature(T),both H_(2) and CO in the gas composition increased at different rates.At the same time,the gas yield and gasification efficiency increased when the calorific value of gas decreased.As the increase of the mass ratio of water vapor and RDF(S/R),H_(2) composition,H_(2) production rate and the potential of H_(2) production rate were on the rise while the proportion of CO and CH 4 decreased constantly.Since the decomposition of tar and alkane gas,the gas calorific value decreased while the gas production rate increased,and the gasification efficiency increased from 54.49%to 74.30%during the whole process.The best gasification temperature interval and S/R were determined to be 950~1000℃and 1.7 respectively through a comprehensive analysis.

关 键 词：单一流化床 两步法气化 垃圾衍生燃料 水蒸气气化 气化特性 

分 类 号：TK6[动力工程及工程热物理—生物能]