Lab-scale 고정층 반응기에서 보릿짚 및 밀짚의 열분해 특성에 관한 연구
A Study on the Pyrolysis Characteristics of Barley and Wheat Straw in a Lab-Scale Fixed Bed Reactor
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The pyrolysis characteristics of barley and wheat straw were studied in a lab-scale fixed-bed reactor at various temperatures. The maximum bio-crude oil yields from barley and wheat straw were 41.01% and 47.16%, respectively. The bio-crude oil yield of barley straw increased with temperature while that of wheat straw decreased in the temperature range of 400-500°C. The higher heating value of the bio-crude oil was approximately 10 MJ/kg, which is much smaller than that of the feedstock. The reason for the decrease in the calorific value of bio-crude oil during pyrolysis is thought to be the high ash content of the biomass. It is known that ash has catalytic effects that promote secondary reactions of pyrolysis gas, which can lead to high water content. The catalytic effect of ash can also reduce bio-crude oil selectivity during the pyrolysis process. Therefore, to maximize the bio-crude oil yield and improve its heating value in the pyrolysis of agricultural residues, it can be suggested that pretreatment of the biomass should reduce the ash content or that the pyrolysis condition should be controlled to minimize the secondary reactions.
Abstract
The pyrolysis characteristics of barley and wheat straw were studied in a lab-scale fixed-bed reactor at various temperatures. The maximum bio-crude oil yields from barley and wheat straw were 41.01% and 47.16%, respectively. The bio-crude oil yield of barley straw increased with temperature while that of wheat straw decreased in the temperature range of 400-500°C. The higher heating value of the bio-crude oil was approximately 10 MJ/kg, which is much smaller than that of the feedstock. The reason for the decrease in the calorific value of bio-crude oil during pyrolysis is thought to be the high ash content of the biomass. It is known that ash has catalytic effects that promote secondary reactions of pyrolysis gas, which can lead to high water content. The catalytic effect of ash can also reduce bio-crude oil selectivity during the pyrolysis process. Therefore, to maximize the bio-crude oil yield and improve its heating value in the pyrolysis of agricultural residues, it can be suggested that pretreatment of the biomass should reduce the ash content or that the pyrolysis condition should be controlled to minimize the secondary reactions.