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为探讨木薯茎低温热解特性,采用热重分析仪、固定床热解实验等对木薯茎低温热解过程进行了研究。结果表明,木薯茎热解可分为脱水、热解、炭化3个阶段;在热解终温为400~700℃范围内,木薯茎的固体产物随温度升高而持续降低,气体产物则随温度升高而不断增大,液体产率先增大后减小,在600℃木薯茎热解液体产率达到最大值45.6%;随后采用红外分析、气相色谱仪、扫描电镜等设备对热解后的液、气、固产物进行分析。结果表明,在热解终温为600℃时,木薯茎热解液的p H值低、氧含量高、热值低,其值分别为2.7~3.1、56.70%、15.3 MJ/kg,红外分析表明木薯茎热解液含较多的酚、醇、羧酸;木薯茎热解气体产物经气相色谱分析主要为CO2、CO、CH4和H2所占比例分别为61.10%、23.74%、10.03%和2.23%;木薯茎热解固体产物中挥发分较低,焦的比表面积为54.12 m2/g。
In order to investigate the pyrolysis characteristics of cassava stems at low temperature, the pyrolysis process of cassava stems was studied by thermogravimetry and fixed-bed pyrolysis experiments. The results showed that the pyrolysis of cassava stem could be divided into three stages of dehydration, pyrolysis and carbonization. At the final pyrolysis temperature of 400-700 ℃, the solid product of cassava stem decreased with the increase of temperature, The liquid yield increased first and then decreased with the increase of temperature. The yield of cassava stem pyrolysis liquid reached to a maximum of 45.6% at 600 ℃. After that, the yield of cassava stem pyrolysis liquid reached 45.6% The liquid, gas and solid products were analyzed. The results showed that the pyrolysis of cassava stem pyrolysis had low p H value, high oxygen content and low calorific value at the final pyrolysis temperature of 600 ℃, which were 2.7-3.1, 5.67% and 15.3 MJ / kg, respectively. The infrared analysis The contents of CO2, CO, CH4 and H2 in the cassava stem pyrolysis gas products were 61.10%, 23.74%, 10.03% and 2.23%. The volatile content of pyrolysis products of cassava stems was lower, and the specific surface area of coke was 54.12 m2 / g.