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Experimental investigation of wood pellet swelling and shrinking during pyrolysis

机译：木质颗粒热解膨胀胀缩的实验研究

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Gasification of wood pellets in downdraft gasifier is confronted with the problem of granulated fuel agglomeration. It occurs when the wood pellets are moving from the pyrolysis zone to the oxidation zone and pellets stick together in lumps, which disrupts the movement of fuel and stops further process. In order to investigate the cause and regularities of fuel agglomeration, experimental studies of wood pellets thermal deformations during pyrolysis were carried out. Experimental studies were performed in an electrically heated horizontal tubular furnace from 300 degrees C to 1000 degrees C temperature in an inert atmosphere capturing wood pellet thermal deformations by a digital camera. During investigation the center temperature of the pellet was also measured. Analyzed results showed that wood pellet final diameter decreased when the heating temperature increased. It was also established that the pellet expanded from 400 degrees C to 900 degrees C heating temperature at the beginning of pyrolysis process. The maximum swelling effect was reached at 550 degrees C temperature and after it swelling intensity was decreasing till 900 degrees C temperature. Over 900 degrees C heating temperature, the expansion phenomenon was no longer visible. The tendency of wood pellet size alteration (swelling and shrinking) depends on heating temperature. The obtained results explain the reason for adhesion of wood pellets in the gasifier and reveal regularity of wood pellet size changes with increasing heating temperature. (C) 2014 Elsevier Ltd. All rights reserved.
机译：向下气流气化炉中木质颗粒的气化面临着颗粒状燃料结块的问题。当木屑颗粒从热解区移至氧化区，并且颗粒团块粘在一起时会发生这种情况，这会中断燃料的移动并停止进一步的处理。为了研究燃料团聚的原因和规律，进行了木质颗粒热解过程中热变形的实验研究。实验研究是在惰性气氛下，在电加热的卧式管状炉中在300摄氏度至1000摄氏度的温度下进行的，通过数码相机捕获木屑的热变形。在研究过程中，还测量了颗粒的中心温度。分析结果表明，随着加热温度的升高，木质颗粒的最终直径减小。还确定了在热解过程开始时，粒料从400℃加热到900℃。在550℃的温度下达到最大的溶胀效果，然后溶胀强度降低到900℃的温度。在加热温度超过900摄氏度时，不再出现膨胀现象。木质颗粒尺寸变化的趋势（膨胀和收缩）取决于加热温度。所得结果解释了气化炉中木屑颗粒粘附的原因，并揭示了木屑尺寸随加热温度升高而变化的规律性。 （C）2014 Elsevier Ltd.保留所有权利。

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