水热温度对玉米秆水热炭热解特性的影响  

EFFECTS OF HYDROTHERMAL TEMPERATURE ON PYROLYSIS CHARACTERISTICS OF CORN STALK HYDROCHAR

作　　者：郑迪维娜 崔翔 胡国荣[1] 王贤华[1] 杨海平[1] 陈汉平[1] Zheng Diweina;Cui Xiang;Hu Guorong;Wang Xianhua;Yang Haiping;Chen Hanping(State Key Laboratory of Coal Combustion,Huazhong University of Science&Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学煤燃烧国家重点实验室,武汉430074

出　　处：《太阳能学报》2021年第8期472-477,共6页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51976065)。

摘　　要：为探索通过水热预处理提高生物质热解产物,特别是生物油品质的可行性,以玉米秆为原料,利用热重分析仪和固定床研究160~220℃水热预处理温度对水热炭性质及其热解特性的影响。研究结果表明:水热预处理能显著脱除原料中的半纤维素和灰分,特别是K、Na、Mg金属元素,同时改变纤维素和木质素的热解特性,促进纤维素向糖类物质的转化、木质素向固体产物的转化。水热炭550℃热解生物油产率随水热温度的升高先增后减,180℃水热炭的生物油产率最高,达到64%,同时生物油中糖类物质的相对含量为46.4%,有利于其高值化利用。Hydrothermal carbonization is considered as one of the most promising pretreatment technologies for biomass. Temperature is the most important parameter during hydrothermal pretreatment. To explore the feasibility of improving the quality of biomass pyrolysis products,especially bio-oil quality by adopting hydrothermal pretreatment,the properties of hydrochar and its pyrolysis characteristics prepared from corn stalk at different hydrothermal temperatures from 160 ℃ to 220 ℃ were researched using a thermogravimetric analyzer and a fixed-bed experiment device respectively. The bio-oil composition was analyzed by a gas chromatograph-mass spectrometer and the peak area normalization method was used to calculate the relative content of main organic matter. The results show that hydrothermal pretreatment can significantly remove hemicellulose and ash content from corn stalks,especially some metal elements,such as K,Na and Mg,while changing the pyrolysis characteristics of cellulose and lignin,including promoting the conversion of cellulose to sugar and lignin to solid product. With hydrothermal temperature increasing,the yields of bio-oil from hydrochars pyrolysis at 550 ℃ first increase and then decrease. The hydrochar obtained at 180 ℃ has the maximum bio-oil yield of 64%,meanwhile the relative content of sugars in the bio-oil is 46.4%,which is beneficial to high-value utilization of bio-oil.

关 键 词：生物质能 热解 矿物质 水热温度 脱水糖含量 生物油 

分 类 号：TK6[动力工程及工程热物理—生物能]