不同热解温度下玉米秸秆中碱金属K和Na的释放及半焦中赋存特性

doi:10.11949/j.issn.0438-1157.20161277

化工学报 ›› 2017, Vol. 68 ›› Issue (4): 1600-1607.DOI: 10.11949/j.issn.0438-1157.20161277

不同热解温度下玉米秸秆中碱金属K和Na的释放及半焦中赋存特性

孟晓晓¹, 孙锐¹, 袁皓², 周伟¹, 任霄汉¹, 张瑞寒¹

1 哈尔滨工业大学能源科学与工程学院, 黑龙江哈尔滨 150001;
2 中国船舶重工集团公司规划发展战略研究中心, 北京 100861

收稿日期:2016-09-12 修回日期:2016-11-01 出版日期:2017-04-05 发布日期:2017-04-05
通讯作者: 孙锐
基金资助:
国家自然科学基金项目（51476046）。

Effect of different pyrolysis temperature on alkali metal K and Na emission and existence in semi-char

MENG Xiaoxiao¹, SUN Rui¹, YUAN Hao², ZHOU Wei¹, REN Xiaohan¹, ZHANG Ruihan¹

1 School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001 Heilongjiang, China;
2 China Shipbuilding Industry Corporation, Beijing 100861 China

Received:2016-09-12 Revised:2016-11-01 Online:2017-04-05 Published:2017-04-05
Supported by:
supported by the National Natural Science Foundation of China(51476046).

摘要/Abstract

摘要：

为了解高含K玉米秸秆在不同热解温度下碱金属的析出规律，建立了一维水平管式炉，利用FTIR、SEM-EDX、XRD等测试手段及化学分馏法对碱金属的释放规律及热解半焦中赋存形式进行深入实验研究。结果表明：K是玉米秸秆的主要碱金属元素，且91%的K以无机K的形式存在；300~600℃主要为有机K的分解、释放阶段，大于600℃主要为KCl、K₂SO₄等无机K分解、释放。K元素由颗粒内部向表面迁移，并在700℃出现表面K盐富集，继续升温富集程度降低；Na和K析出规律相似，Ca和Mg热稳定性强，热解过程多以稳定的化合物形式存在于热解半焦中，不易析出到气相。

关键词: 玉米秸秆, 温度, 生物质, 热解, 碱金属, K

Abstract:

The modes of occurrence and emission of alkali metal of corn straw were studied at different pyrolysis temperature and all experiments were conducted on a horizontal tubular reactor. Experiment analysis included pyrolysis gases release measured with FTIR, alkali metal concentration analyzed with ICP-AES, existence form of AAEM with chemical fractionation analysis (CFA), microscopic structure of semi-char with SEM/EDX, and type of alkali metal tested with XRD. The results showed that most of K in corn straw was inorganic K (91%). The major organic K was released during 300-600℃ with the main releasing compounds of inorganic K of KCl and K₂SO₄, etc. K migrated from inner to the surface of particle, leading to enrich K at the surface (700℃), and the content of K decreased with further increasing temperature. The release characteristics of K and Na were similar, however, the main transformation element was K. Due to the thermal stability of Ca and Mg, they were difficult to release during pyrolysis.

Key words: corn straw, temperature, biomass, pyrolysis, alkali metal, potassium

中图分类号:

TQ54

孟晓晓, 孙锐, 袁皓, 周伟, 任霄汉, 张瑞寒. 不同热解温度下玉米秸秆中碱金属K和Na的释放及半焦中赋存特性[J]. 化工学报, 2017, 68(4): 1600-1607.

MENG Xiaoxiao, SUN Rui, YUAN Hao, ZHOU Wei, REN Xiaohan, ZHANG Ruihan. Effect of different pyrolysis temperature on alkali metal K and Na emission and existence in semi-char[J]. CIESC Journal, 2017, 68(4): 1600-1607.

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不同热解温度下玉米秸秆中碱金属K和Na的释放及半焦中赋存特性

Effect of different pyrolysis temperature on alkali metal K and Na emission and existence in semi-char

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