Silicon distribution in straw black liquor recovery process of pyrolysis and combustion

YUAN Hongyou; WU Shubin; YIN Xiuli; HUANG Yanqin; LIU Huacai; WANG Guijin; ZHAN Hao; WU Chuangzhi

doi:10.11949/j.issn.0438-1157.20171266

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Silicon distribution in straw black liquor recovery process of pyrolysis and combustion

更新时间：2025-12-10

- Silicon distribution in straw black liquor recovery process of pyrolysis and combustion
- CIESC Journal Issue 5, Pages: 2191-2198(2018)
- 作者机构：
  
  1. 华南理工大学制浆造纸工程国家重点实验室,广东,广州,510641
  2. 中国科学院广州能源研究所中国科学院可再生能源重点实验室,广东,广州,510640
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20171266
  CLC： S79TK6
- Online First：05 May 2018，
  
  Published：05 May 2018
- 稿件说明：
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YUAN Hongyou, WU Shubin, YIN Xiuli, et al. Silicon distribution in straw black liquor recovery process of pyrolysis and combustion[J]. CIESC Journal, 2018, (5): 2191-2198.
DOI：

YUAN Hongyou, WU Shubin, YIN Xiuli, et al. Silicon distribution in straw black liquor recovery process of pyrolysis and combustion[J]. CIESC Journal, 2018, (5): 2191-2198. DOI： 10.11949/j.issn.0438-1157.20171266.

摘要

热解作为一种生物质能源利用技术，有望为草浆黑液的碱回收提供新途径。利用10 kg·h-1搅拌热解实验装置对麦草浆黑液开展了研究，分析热解半焦浸取与燃烧熔融物溶解两种绿液制备方式在总碱回收及硅元素分布方面的差异。结果表明：热解浸取法所获得绿液中包括碳酸钠和硅酸钠在内的总碱量与燃烧溶解法相比基本相等或稍高；浸取完成后有30%～40%的硅元素未溶入绿液而留存于固相即炭粉之中，主要赋存形态为Al、Ca、Fe和Mn等非过程元素的复合硅酸盐；由于数量可观的硅元素留存于固相，因此热解浸取法相比燃烧溶解法绿液硅含量较低，也因此碳酸钠与硅酸钠之比较高。热解浸取法的硅元素分布特性有利于后续的石灰苛化操作。

Abstract

Pyrolysis technology is a widely utilized process in biomass energy production

and has potential to serve as an alternative for recovery of straw black liquor. A 10 kg·h-1 stirring type pyrolysis experimental apparatus was employed to prepare black liquor char (BLC) and fuel gas

aiming to analyze the differences of total alkali recovery and silicon distribution between BLC-leached and smelt-dissolved green liquor. The results showed that the total alkali in BLC-leached green liquor was equal to or a bit higher than that of smelt-dissolved green liquor. Around 30% to 40% of silicon retained in BLC-leached carbon powder as forms of insoluble silicates

which were mainly compound silicates of non-process elements such as Al

Fe and Mn. Because of the retention of a considerable part of silicon in leaching solid phase

the silicon concentration was lower in BLC-leached green liquor than that of smelt-dissolved green liquor

and the ratio of Na2CO3 to Na2SiO3 (or Na4SiO4) decreased to a large extent in the former green liquor compared to the latter. The findings indicate that chemical recovery using pyrolysis-leaching method is beneficial for decreasing the affects of silica problem especially improving the lime causticizing process.

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