稻壳水热炭化学结构和燃烧特性及动力学分析  

CHEMICAL STRUCTURE,COMBUSTION CHARACTERISTICS AND DYNAMIC ANALYSIS OF RICE HUSK HYDROTHERMAL CARBON

作　　者：刘耀鑫 王恩宇 阚泽 朱婧文 张小辉[4] Liu Yaoxin;Wang Enyu;Kan Ze;Zhu Jingwen;Zhang Xiaohui(School of Energy and Power,Shenyang Institute of Engineering,Shenyang 110136,China;Graduate Department,Shenyang Institute of Engineering,Shenyang 110136,China;Dongguan Electric Power Group Co.Ltd.,Shenyang 110136,China;Engineering Training Center,Shenyang Institute of Engineering,Shenyang 110136,China)

机构地区：[1]沈阳工程学院能源与动力学院,沈阳110136 [2]沈阳工程学院研究生部,沈阳110136 [3]东管电力集团股份有限公司,沈阳110136 [4]沈阳工程学院工程训练中心,沈阳110136

出　　处：《太阳能学报》2022年第12期439-445,共7页Acta Energiae Solaris Sinica

基　　金：2020年辽宁省高等学校创新人才支持计划;2021年辽宁省教育厅基本科研项目(LJKZ1087)。

摘　　要：以稻壳为原料,利用水热碳化技术结合元素分析和热重法,考察水热反应强度对水热炭化学结构和燃烧特性及动力学的影响。结果表明:1)随着反应强度参数(lgR_(0))的增大,水热炭整体挥发分和氧元素质量分数呈减少趋势,而C元素质量分数则逐渐增加,当水热反应强度lgR_(0)为4.90~6.19时,参数变化尤为显著,lgR_(0)为6.19时,C元素和O元素的质量分数分别为50.5%和21.3%,O/C和H/C原子比分别为0.32和1.21;2)相对于原料,水热炭的燃烧损失集中在固定碳和挥发分燃烧阶段,着火和燃尽温度均有小幅上升;3)当lgR0由3.25增至6.49时,挥发分燃烧损失减小,固定碳燃烧损失增大,着火与燃尽温度呈整体向高温区转移的趋势,综合燃烧特性指数(S_(N))呈先增加后减小的趋势;4)固定碳燃烧段活化能低于挥发分燃烧段,本次采用的动力学模型分析水热炭燃烧动力学结果可靠,相关系数(R^(2))均在0.92以上。Using rice husk as raw material,the effects of hydrothermal reaction intensity on the chemical structure,combustion characteristics and dynamic performance of hydrothermal carbon were investigated by using hydrothermal carbonization technology combined with elemental analysis and thermogravimetric method.The results show that:1)With the increase of reaction intensity,the overall volatiles and oxygen mass fraction of hydrothermal carbon decrease,while the carbon mass fraction gradually increases.When LGR_(0) is 4.90~6.19,the change of parameters is particularly significant.When LGR_(0) is 6.19,the carbon and oxygen mass fraction are 50.5% and 21.3%,respectively.The atomic ratios of O/C and H/C are 0.32 and 1.21,respectively;2)Compared with the raw material,the combustion loss of hydrothermal carbon is concentrated in the combustion stage of fixed carbon and volatiles,and the ignition and burnout temperatures both rise slightly;3)When LGR_(0) increases from 3.25 to 6.49,the volatiles combustion loss decreases,the fixed carbon combustion loss increases,the ignition and burnout temperatures shift to the high temperature region,and the index of integrated combustion characteristics(SN)first increases and then decreases;4)The activation energy of the fixed carbon combustion section is lower than that of the volatile combustion section.The dynamic model used in this study is reliable in the analysis of the hydrothermal carbon combustion dynamics,and the correlation coefficients(R^(2))are all above 0.92.The results can provide theoretical guidance for hydrothermal carbonation and combustion of rice husk.For example,the reaction intensity parameter LGR_(0) should be controlled at about 6.19 if carbonation is the main process.

关 键 词：生物质 燃烧 动力学 水热碳 热化学处理 综合燃烧特性指数 

分 类 号：TK16[动力工程及工程热物理—热能工程]