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生物质化学工程 ›› 2021, Vol. 55 ›› Issue (5): 21-29.doi: 10.3969/j.issn.1673-5854.2021.05.004

• 研究报告 • 上一篇    下一篇

反应条件对玉米秸秆水热液化产物分布及特性的影响

李艳美, 田纯焱, 丑鹏涛, 张念泽, 柏雪源(), 易维明   

  1. 山东理工大学 农业工程与食品科学学院; 山东省清洁能源工程技术研究中心, 山东 淄博 255000
  • 收稿日期:2020-07-22 出版日期:2021-09-30 发布日期:2021-09-13
  • 通讯作者: 柏雪源 E-mail:baixy@sdut.edu.cn
  • 作者简介:柏雪源, 教授, 博士生导师, 主要从事农业生物质能源与材料研究工作; E-mail: baixy@sdut.edu.cn
    李艳美(1988-), 女, 山东滕州人, 博士生, 主要从事农业生物质能源与材料研究工作
  • 基金资助:
    山东省自然科学基金资助项目(ZR2017BEE049);国家自然科学基金资助项目(51706126);淄博市校城融合项目资助项目(2019ZBXC380)

Effects of Reaction Conditions on Products Distribution and Characteristics of Hydrothermal Liquefaction of Cornstalk

Yanmei LI, Chunyan TIAN, Pengtao CHOU, Nianze ZHANG, Xueyuan BAI(), Weiming YI   

  1. School of Agricultural Engineering and Food Science, Shandong University of Technology; Shandong Research Center of Engineering & Technology for Clean Energy, Zibo 255000, China
  • Received:2020-07-22 Online:2021-09-30 Published:2021-09-13
  • Contact: Xueyuan BAI E-mail:baixy@sdut.edu.cn

摘要:

利用间歇式生物质水热液化反应釜,通过正交试验设计考察不同反应条件对玉米秸秆水热液化(HTL)的影响,过程参数包括反应温度(250~350℃),反应时间(0~60 min)和含固量(5%~15%)。从元素组成、官能团分布、主要化学成分以及结构形貌等对玉米秸秆水热液化产物的特性进行了分析。研究结果表明:玉米秸秆水热液化的较优条件为反应温度300℃、反应时间30 min、含固量5%,此时生物原油(BO)、固体残渣(SR)、其他产物(气相和水相产物)的产率以及液化率分别为22.85%、15.02%、62.13%和84.98%。过程参数对玉米秸秆水热液化的产物分布有显著影响。不同反应条件下玉米秸秆组分降解程度不同,生物原油的产率8.31%~22.85%,热值30.56~32.69 MJ/kg,水相产物的总有机碳(TOC)7 711.5~12 336.0 mg/L,固体产物的组成和表面形貌也不同。FT-IR结果显示:生物原油的官能团分布相似,仅某些峰强度有所差异,表明不同水热条件制备的生物原油中化合物种类相似但含量存在差异。GC-MS分析结果显示:生物原油组成包括酚类、酮类、有机酸类、醛类、醇类、含氮化合物和呋喃类等化合物。

关键词: 玉米秸秆, 水热液化, 生物原油, 产物分布

Abstract:

The hydrothermal liquefaction(HTL) of cornstalk was carried out on a batch-mode reactor under different reaction conditions through orthogonal experiment design. The experimental variables were reaction temperature(250-350℃), time(0-60 min) and solid content(5%-15%). The characteristics of HTL products were analyzed from several levels such as elements, functional groups, the main chemicals and microstructure. The results showed that the optimum conditions for HTL were temperature 300℃, time 30 min, solid content 5%, at which the yields of biocrude oil(BO), solid residues(SR) and others(gas and liquid) were 22.85%, 15.02% and 62.13% and the liquefaction rate was 84.98%. The HTL operational parameters significantly affected the products distribution and conversion. The degradation degree of components was different under different reaction conditions, which resulted in the biocrude oil yields of 8.31%-22.85%, with HHV of 30.56-32.69 MJ/kg, the aqueous phase TOC content of 7 711.5-12 336.0 mg/L and different composition and surface morphology occurring in solid residues. FT-IR results showed that the functional group distribution of bio-crude oils was similar and indicated the species of compounds in biocrude oils under different liquefaction conditions were similar. GC-MS results showed that major compounds of biocruded oil include phenols, ketones, organic acids, aldehydes, alcohols, nitrogen-containing compounds and furans.

Key words: cornstalk, hydrothermal liquefaction, biocrude oil, products distribution

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