Experimental study on non-woody biomass gasification in a downdraft gasifier

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• 作者：Chao Gai^a ; ^b ; ^{shandagaichao@163.com} ; Yuping Dong^a ; ^b ; ^{dongyp@sdu.edu.cn}
• 关键词：Biomass ; Downdraft ; Gasification ; Sulphur ; Chlorine
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：March, 2012
• 卷：37
• 期：6
• 页码：4935-4944
• 文件大小：1017 K

摘要

The current paper concerns the process of non-woody biomass gasification, particularly about releasing processes of detrimental elements. The gasification of corn straw was carried out in a downdraft fixed bed gasifier under atmospheric pressure, using air as an oxidizer. The effects of the operating conditions on gasification performance in terms of the temperature profiles of the gasifier, the composition distribution of the producer gas and the release of sulphur and chlorine compounds during gasification of corn straw were investigated. Besides, the gasification characteristics were evaluated in terms of low heating value (LHV), gas yield, gasification efficiency and tar concentration in the raw gas.

According to the experimental results, operating conditions have great influence on the temperature profiles of the gasifier and the composition distribution of the product gas. During the gasification of non-woody biomass, the variations of the concentration of sulphur and chlorine compounds in gaseous and ash are not a monotonic tread under different operating conditions. Besides, over the ranges of the equivalence ratio(ER) examined, higher or lower ER both degraded the quality of gas and gasification efficiency. If ER is regarded as a function of the combustible species, the optimum value of ER is 0.28-0.32, and the optimal LHV of 5.39聽MJ/Nm³, gas yield of 2.86聽Nm³/kg, gasification efficiency of 73.61%and tar concentration of 4617聽mg/Nm³ is obtained at different ER.