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林产化学与工业 ›› 2020, Vol. 40 ›› Issue (4): 114-122.doi: 10.3969/j.issn.0253-2417.2020.04.016

• 研究报告 • 上一篇    下一篇

碱金属对生物质热解特性的影响

蒋黎阳1,2(),周臻1,2,田红1,2,*(),赵洁霞3   

  1. 1. 长沙理工大学 能源与动力工程学院, 湖南 长沙 410114
    2. 清洁能源与智能电网2011协同创新中心, 湖南 长沙 410114
    3. 中南大学 能源科学与工程学院, 湖南 长沙 410083
  • 收稿日期:2020-04-03 出版日期:2020-08-28 发布日期:2020-08-21
  • 通讯作者: 田红 E-mail:1258950123@qq.com;tianh1103@163.com
  • 作者简介:蒋黎阳(1996-),男,湖南永州人,硕士生,从事生物质热解特性研究; E-mail:1258950123@qq.com
  • 基金资助:
    国家自然科学基金资助项目(51706022);湖南省自然科学基金资助项目(2018JJ3545);湖南省重点实验室开放基金资助项目(2015ZNDL009)

Effect of Alkali Metal Impregnation on Pyrolysis Characteristics of Biomass

Liyang JIANG1,2(),Zhen ZHOU1,2,Hong TIAN1,2,*(),Jiexia ZHAO3   

  1. 1. School of Energy & Power Engineering, Changsha University of Science and Technology, Changsha 410114, China
    2. Clean Energy and Smart Grid 2011 Collaborative Innovation Center, Changsha 410114, China
    3. School of Energy Science and Engineering, Central South University, Changsha 410083, China
  • Received:2020-04-03 Online:2020-08-28 Published:2020-08-21
  • Contact: Hong TIAN E-mail:1258950123@qq.com;tianh1103@163.com

摘要:

以稻秆、谷壳为原料,经硝酸酸洗后使用KCl和NaCl浸渍处理,采用热重分析仪和傅里叶红外光谱联用(TG-FT-IR)对经过不同处理的样品的热解以及热解气体产物进行分析,探讨了碱金属对生物质热解特性的影响。对比稻秆与谷壳原样、酸洗样和碱金属溶液浸渍样的热解TG/DTG曲线与气体产物分布发现:KCl和NaCl溶液浸渍明显增加了样品中的K、Na元素含量,样品的主要热解失重区间前移,降低了热解最大失重速率;K+,Na+浸渍的稻秆和谷壳与酸洗样相比热解焦产率分别提高了5.3%、7.89%和10.95%、11.59%,热解焦产率氯化钠浸泡样>氯化钾浸泡样>原样>酸洗样,且K+热解催化能力强于Na+;K+、Na+浸渍样有利于生物质开环反应,促进了脱羧和脱羰反应,增加CO2、CO和羟基酮的产生。

关键词: 生物质, 碱金属离子, 酸洗, 浸渍, 热解特性

Abstract:

The thermogravimetric analyzer and Fourier transform infrared spectroscopy (TG-FT-IR) were used to experimentally study rice straw, husks, different nitric acid washed samples and alkali metal ion impregnated samples, which analyzed the effect of external alkali metals impregnation on biomass pyrolysis characteristics. The pyrolysis TG/DTG curves and gas-generating components of the original sample, acidly washed sample and alkali metal solution impregnated sample were compared, it was found that the impregnation of alkali metal solution greatly increased the content of alkali metal elements in the sample and promoted the formation of active cellulose. Thus, the main weight loss interval of the pyrolysis of the sample was moved forward, and the maximum weight loss rate of pyrolysis was reduced; the pyrolysis yields of K+, Na+ impregnated rice stalks and rice hulls were increased by 5.3%, 7.89%, and 10.95%, 11.59%, the order of pyrolysis coke yields was sodium chloride immersion sample > potassium chloride immersion sample > original samples > acidly wased sample, and K+ pyrolysis catalytic ability was stronger than Na+; K+, Na+ immersion sample were good for biomass ring-opening reaction, promoted the decarboxylation and decarbonylation reactions, and increased the production of CO2, CO, and hydroxyketones.

Key words: biomass, alkali metal, acidly washing, impregnation, pyrolysis characteristics

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