Thermal Pre-Treatment of Sewage Sludge in a Lab-Scale Fluidized Bed for Enhancing Its Solid Fuel Properties

被引：14
|
作者：
Karki, Sujeeta [1 ]
Poudel, Jeeban [2 ]
Oh, Sea Cheon [1 ]
机构：
[1] Kongju Natl Univ, Dept Environm Engn, 1223-24 Cheonan Daero, Seobuk 330717, Chungnam, South Korea
[2] Kongju Natl Univ, Dept Mech Engn, 1223-24 Cheonan Daero, Seobuk 330717, Chungnam, South Korea
来源：
APPLIED SCIENCES-BASEL | 2018年 / 8卷 / 02期
关键词：
chemical exergy; degree of torrefaction; fluidized bed; calorific value; ultimate analysis; sewage sludge; torrefaction index; BIOMASS TORREFACTION; COMBUSTIBLE PROPERTIES; PYROLYSIS PRODUCTS; HEATING VALUES; REACTOR; DENSIFICATION; EMISSIONS; WASTE; GRINDABILITY; COCOMBUSTION;
D O I：
10.3390/app8020183
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Thermal pre-treatment of non-lignocellulosic biomass, sewage sludge, using a lab-scale fluidized bed reactor was carried out in order to enhance its solid fuel properties. The influence of the torrefaction temperature range from 200-350 degrees C and 0-50 min residence time on the physical and chemical properties of the torrefied product was investigated. Properties of the torrefied product were analyzed on the basis of the degree of torrefaction, ultimate and proximate analysis, and gas analysis. An attempt was made to obtain the chemical exergy of sewage sludge. An elevated torrefaction temperature presented a beneficial impact on the degree of torrefaction and chemical exergy. Moreover, the effect of the torrefaction temperature and residence time on the elemental variation of sewage sludge exhibited an increase in the weight percentage of carbon while the H/C and O/C molar ratios deteriorated. Additionally, the product gas emitted during torrefaction was analyzed to study the pathway of hydrocarbons and oxygen containing compounds. The compounds with oxygen were emitted at higher temperatures in contrast to hydrocarbon gases. In addition, the study of various correlations for predicting the calorific value of torrefied sewage sludge was made.
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页数：15
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