东北大学学报(自然科学版) ›› 2025, Vol. 46 ›› Issue (12): 124-131.DOI: 10.12068/j.issn.1005-3026.2025.20240150

• 资源与土木工程 • 上一篇    

燃煤耦合生物质在CO2气氛下共气化产气特性及动力学研究

姚锡文, 张宏柏, 许开立, 张雷雷   

  1. 东北大学 资源与土木工程学院,辽宁 沈阳 110819
  • 收稿日期:2024-07-15 出版日期:2025-12-15 发布日期:2026-02-09
  • 通讯作者: 许开立
  • 作者简介:姚锡文(1987—),男,山东五莲人,东北大学副教授
  • 基金资助:
    国家自然科学基金资助项目(52474214);国家自然科学基金资助项目(52004055)

Study on Gas Production Characteristics and Kinetics of Coal and Biomass Co-gasification Under CO2 Atmosphere

Xi-wen YAO, Hong-bai ZHANG, Kai-li XU, Lei-lei ZHANG   

  1. School of Resources & Civil Engineering,Northeastern University,Shenyang 110819,China.
  • Received:2024-07-15 Online:2025-12-15 Published:2026-02-09
  • Contact: Kai-li XU

摘要:

采用可控气氛管式炉研究煤与生物质在CO2气氛下气化过程中的产气规律及反应动力学特性.研究发现,煤与生物质在N2气氛下热解分为3个阶段:脱水(30~210 ℃)、急剧热解(210~400 ℃)和缓慢热解(400~1 000 ℃);在CO2气氛下气化分为4个阶段:脱水(30~210 ℃)、挥发分释放(210~400 ℃)、缓慢失重(400~660 ℃)和Boudouard反应(660~1 000 ℃);CO2气氛下气化转化率约85%,高于N2气氛下的53%;CO2气氛下的气化反应较N2气氛下所需活化能更高,但反应速率较快;煤与生物质在CO2气氛下气化产生的气体主要包括CO,CO2,CH4和H2;800 ℃时CO气体再次生成,说明高温下CO2作为氧化剂与碳发生Boudouard反应;CO2抑制CH4,H2和C m H n 这些含氢高热值气体的生成.

关键词: CO2气氛, 煤, 生物质, 气化特性, 反应动力学

Abstract:

A controlled-atmosphere tube furnace was used to study the gas production and reaction kinetics of coal and biomass during gasification under CO2 atmosphere. It is found that the pyrolysis of coal and biomass under N2 atmosphere is divided into three stages: dehydration (30~210 ℃), rapid pyrolysis (210~400 ℃), and slow pyrolysis (400~1 000 ℃). Gasification under CO2 atmosphere is divided into four stages: dehydration (30~210 ℃), volatile release (210~400 ℃), slow weight loss (400~660 ℃), and Boudouard reaction (660~1 000 ℃). The gasification conversion rate under CO2 atmosphere is about 85%, which is higher than that under N2 atmosphere (53%). The gasification reaction under CO2 atmosphere requires higher activation energy than that under N2 atmosphere, but the reaction rate is faster. The gases produced by the gasification of coal and biomass under CO2 atmosphere mainly include CO, CO2, CH4, and H2. At 800 ℃, CO gas is regenerated, indicating that CO2 has a Boudouard reaction with carbon as an oxidant at high temperatures. CO2 inhibits the formation of CH4, H2, and C m H n, which contain hydrogen and gases with high calorific values.

Key words: CO2 atmosphere, coal, biomass, gasification characteristics, reaction kinetics

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