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

MENG Xiaoxiao; SUN Rui; YUAN Hao; ZHOU Wei; REN Xiaohan; ZHANG Ruihan

doi:10.11949/j.issn.0438-1157.20161277

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

更新时间：2025-12-10

- Effect of different pyrolysis temperature on alkali metal K and Na emission and existence in semi-char
- CIESC Journal Issue 4, Pages: 1600-1607(2017)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20161277
  CLC： Q54
- Online First：05 April 2017，
  
  Published：05 April 2017
- 稿件说明：
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MENG Xiaoxiao, SUN Rui, YUAN Hao, et al. Effect of different pyrolysis temperature on alkali metal K and Na emission and existence in semi-char[J]. CIESC Journal, 2017, (4): 1600-1607.
DOI：

MENG Xiaoxiao, SUN Rui, YUAN Hao, et al. Effect of different pyrolysis temperature on alkali metal K and Na emission and existence in semi-char[J]. CIESC Journal, 2017, (4): 1600-1607. DOI： 10.11949/j.issn.0438-1157.20161277.

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。

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.

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