烘焙预处理对方竹热解产物特性的影响  

Pretreatment on characteristics of pyrolysis products for small diameter sympodial bamboo with torrefaction

作　　者：张雨 徐佳佳 马中青[1] 王浚浩 李文珠[1] 张文标[1] ZHANG Yu;XU Jiajia;MA Zhongqing;WANG Junhao;LI Wenzhu;ZHANG Wenbiao(Zhejiang Provincial Collaborative Innovation Center for Bamboo Resources and High-Efficiency Utilization,School of Engineering,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China)

机构地区：[1]浙江农林大学工程学院浙江省竹资源与高效利用协同创新中心

出　　处：《浙江农林大学学报》2019年第5期981-989,共9页Journal of Zhejiang A&F University

基　　金：浙江省重点研发计划项目（2018C02008）;国家自然科学基金资助项目（51706207）;中国博士后科学基金资助项目（2017M611987）;浙江省自然科学基金资助项目（LQ17E060002）;浙江省与中国林科院省院合作林业科技项目（2017SY01）;中国科协青年人才托举工程（2018QNRC001）;浙江农林大学大学生科研训练项目（KX20180111)

摘　　要：以小径级竹材方竹Chimonobambusa quadrangularis为研究对象,采用程序控温管式炉、热重红外联用仪(TG-FTIR)和快速热解-气质联用仪(Py-GC/MS)等开展方竹烘焙与热解试验,探究烘焙温度(210,240,270和300℃)对热解(550℃)过程中气、固、液三态产物特性的影响,分析方竹烘焙后固体产物热解机制。结果表明:随烘焙温度升高,固体产物中碳元素及固定碳相对含量显著提高,氧元素及挥发分相对含量明显降低,氧碳比由0.72减小到0.53,热值由18.32 MJ·kg^-1增加到21.65 MJ·kg^-1,竹材能量密度显著提高。热解气体产物主要有二氧化碳(CO2)、水蒸气(H2O)、一氧化碳(CO)、甲烷(CH4)和氢气(H2),其中CO2产量最大;随烘焙程度加深,CO2,CO,H2O,CH4产量均减小,H2增加。热解液体产物主要有酸类、酚类、呋喃类、酮类和醛类等,其中酸类、酚类以及呋喃类相对含量较高,分别为12.69%,34.72%和29.80%,酮类及醛类相对含量较少,分别为9.32%和11.87%;随烘焙温度升高,酸类、醛类及呋喃类相对含量逐渐降低,酚类及酮类逐渐增加。To determine the effect of torrefaction temperature on the properties of gas,solid,and liquid products from pyrolysis,small diameter cluster bamboo Chimonobambusa quadrangularis was heated to 210,240,270,and 300℃and a pyrolysis temperature of 550℃.Also,a furnace with a programmed temperature control,a thermogravimetric analyzer coupled with fourier-transform infrared spectrometry(TGA-FTIR),and a pyrolyzer coupled with a gas chromatography/mass spectrometer(Py-GC/MS)were utilized.Based on the analysis,the mechanism of pyrolysis for solid products after torrefaction was discussed.The test of the effect of different temperature torrefaction pretreatment on the characteristics of pyrolysis products with bamboo powder as raw material,repeated three times for each test to reduce the error.Experimental results showed that(1)For the solid product after torrefaction with an increase in torrefaction temperature,the content of C and fixed carbon in solid products increased much;oxygen content and volatile matter decreased,and the O/C ratio decreased from 0.72 to 0.53.The calorific value increased from 18.32 MJ·kg^-1 to 21.65 MJ·kg^-1,and the bamboo energy density strongly improved.(2)For the pyrolysis gas product,the main constituents were in the order CO2>H2O>CO>CH4>H2.As the degree of torrefaction deepened,CO2,H2O,CO and CH4 yields in the pyrolysis decreased,and H2 production increased.(3)The liquid products of pyrolysis were mainly composed of organic substances such as acids,phenols,furans,ketones,and aldehydes.The dominant components were acids(12.69%),phenols(34.72%),and furans(29.80%).However,the content of ketones(9.32%)and aldehydes(11.87%)were lower.With the increase in torrefaction temperature,the content of acids,aldehydes,and furans in pyrolysis oil decreased gradually,and the content of phenols and ketones increased gradually.Thus,the upgrading mechanism for gas,solid,and liquid products from the pyrolysis process in conjunction with torrefaction temperatures,provided basic data for energy utilization of

关 键 词：木材学 竹材 烘焙预处理 热解 热重红外联用 热解气质联用 

分 类 号：TQ351.2[化学工程] S781.46[农业科学—木材科学与技术]