An innovative example of herb residues recycling by gasification in a fluidized bed
An innovative example of herb residues recycling by gasification in a fluidized bed
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DOI：
10.1016/j.wasman.2012.12.009
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发表时间：
2013-04-01
期刊：
影响因子：
8.1
通讯作者：
Jing, Yuanzhuo
中科院分区：
文献类型：
--
作者：
Guo, Feiqiang;Dong, Yuping;Jing, Yuanzhuo
设计了一种中草药渣利用方法，利用循环流化床气化炉将中草药渣转化为工业规模的气体燃料。产品气用于中药生产，锅炉排出的烟气热量可用于中草药渣干燥，实现能源循环利用，无中草药渣排放。在300 kg/h的循环流化床中，对草本植物残渣进行了200 h左右的气化特性研究。结果表明，生物质流量、等效比（ER）、含水率和炭循环对气体组成和焦油产率有影响。以中草药渣为原料，产品气的较低热值为4 ~ 5 MJ/m(3)。当平均生物质流量为5.5 kg m(-2) s(-1)， ER为0.35时，产物气达到较好的状态，热值为4.89 MJ/m(3)，冷气效率为62.36%。当含水率从12.5%增加到18.7%时，H-2、CO和CO2浓度分别从4.66%增加到6.92%、11.23%增加到10.15%和16.55%增加到17.82%；当含水率从12.5%增加到15.4%时，气体中焦油含量从15.1 g/m(3)下降到14.4 g/m(3)。草本残灰中含有金属氧化物，特别是CaO、MgO、K2O、Al2O3和Fe2O3对焦油的催化分解作用明显。附着在炭颗粒上的灰可以降低焦油产量，提高返回气化炉后的气体质量。(c) 2012 Elsevier Ltd.版权所有。
A utilization way of herb residues is designed to convert herb residues to gas fuel in industrial-scale by a circulating fluidized bed gasifier in this paper. The product gas is used in the production of Chinese medicine, and the heat of the flue gas from the boiler can be used in herb residues drying to realize the energy recycling and no herb residues discharge. The gasification characteristics of herb residues in the circulating fluidized bed of 300 kg/h were investigated for about 200 h. The results indicated that the gas composition and tar yield were affected by biomass flow rate, equivalence ratio (ER), moisture content and char circulating. The lower heating value of product gas was 4-5 MJ/m(3) using herb residues as feedstock. When mean biomass flow rate was at 5.5 kg m(-2) s(-1) and ER at 0.35, the product gas reached a good condition with lower heating value of 4.89 MJ/m(3) and cold gas efficiency of 62.36%. When the moisture content changed from 12.5% to 18.7%, the concentrations of H-2, CO and CO2 changed from 4.66% to 6.92%, 11.23% to 10.15%, and 16.55% to 17.82% respectively, and the tar content in gas decreased from 15.1 g/m(3) to 14.4 g/m(3) when the moisture content increased from 12.5% to 15.4%. There are metal oxides in the ash of herb residues, especially CaO, MgO, K2O, Al2O3, and Fe2O3 which have obvious function on tar catalytic decomposition. The ash that attaches to the char particles can decrease the tar yield and improve the quality of gas after returning to the gasifier. (c) 2012 Elsevier Ltd. All rights reserved.