Bio-syngas production with low tar content from sorghum straw by pyrolysis and catalytic cracking with oil shale ash

YANG Jiancheng; ZHANG Guangyi; XU Guangwen; WEN Lixiong

doi:10.11949/j.issn.0438-1157.20170370

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Bio-syngas production with low tar content from sorghum straw by pyrolysis and catalytic cracking with oil shale ash

更新时间：2025-12-10

- Bio-syngas production with low tar content from sorghum straw by pyrolysis and catalytic cracking with oil shale ash
- CIESC Journal Issue 10, Pages: 3779-3787(2017)
- 作者机构：
  
  1. 北京化工大学化学工程学院,北京,100029
  2. 中国科学院过程工程研究所,北京,100190
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20170370
  CLC： 789
- Online First：05 October 2017，
  
  Published：05 October 2017
- 稿件说明：
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YANG Jiancheng, ZHANG Guangyi, XU Guangwen, et al. Bio-syngas production with low tar content from sorghum straw by pyrolysis and catalytic cracking with oil shale ash[J]. CIESC Journal, 2017, (10): 3779-3787.
DOI：

YANG Jiancheng, ZHANG Guangyi, XU Guangwen, et al. Bio-syngas production with low tar content from sorghum straw by pyrolysis and catalytic cracking with oil shale ash[J]. CIESC Journal, 2017, (10): 3779-3787. DOI： 10.11949/j.issn.0438-1157.20170370.

摘要

为从高粱秸秆生产高品质、低焦油含量生物合成气，基于其单段热解特性研究，借助两段式固定床反应器实施两段热解（热解+裂解），同时考察页岩灰对热解挥发分的催化裂解效果。结果表明：相对单段热解，两段热解强化了水蒸气与挥发分（尤其是与热解气）的交互；提高裂解温度促进焦油裂解和重整，便利了热解气的生成，同时提高合成气（H2+CO）的产率和H2/CO体积比；裂解中加入页岩灰显著促进生物焦油气化，大幅降低气体产物焦油含量：裂解温度适中（约850℃）时（450℃热解），热解气产率超过40%（质量），焦油产率低于1.0%（质量），合成气产量约186 ml·g-1、体积分数高达64%，且H2/CO比超过0.5。页岩灰便利H2的生成，主要源于其铁组分对水气变换的催化作用。

Abstract

To obtain high-quality bio-syngas with low tar content from sorghum straw

two-stage prolysis (prolysis+cracking) was performed in a two-stage fixed bed reactor based on the research on its one-stage prolysis characteristics

and the catalytic effects of oil shale ash on cracking the volatile products from pyrolysis were investigated.The results showed that compared to the one-stage prolysis

the two-stage prolysis strengthened the correlation between water vapor with volatiles (above all pyrolysis gas).High cracking temperatures facilitated cracking and reforming of tar

resulting in generation of more gas products and also enhancements in the bio-syngas (H2+CO) yield and the H2/CO volumetric ratio.The oil shale ash significantly promoted gasification of tar.With the oil shale ash added for cracking volatiles at the moderate temperature of 850℃(pyrolysis at 450℃)

the gas yield surpassed 40%(mass) with such a low tar yield as 1.0%(mass).Meanwhile

the yield of bio-syngas reached up to 186 ml·g-1 with its highest content of 64%(vol) in gas products

and the H2/CO volumetric ratio was above 0.5.The oil shale ash facilitated H2 generation mainly due to its ferric component capable of catalyzing water-gas shift reaction.

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