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ISSN 0254-0096 CN 11-2082/K

太阳能学报 ›› 2022, Vol. 43 ›› Issue (10): 335-342.DOI: 10.19912/j.0254-0096.tynxb.2021-0156

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下吸式生物质气化炉热力学平衡模型研究

杨辉1,2, 陈文宇1,2, 孙姣1,2, 陈文义1,2   

  1. 1. 河北工业大学过程装备与控制工程系,天津 300130;
    2. 河北工业大学化工学院,化工节能过程集成与资源利用国家地方联合工程实验室,天津 300130
  • 收稿日期:2021-02-05 出版日期:2022-10-28 发布日期:2023-04-28
  • 通讯作者: 陈文义(1963——),男,博士、教授、博士生导师,主要从事秸秆生物质能综合利用方面的研究。cwy63@126.com
  • 基金资助:
    河北省科技计划(16824316D); 河北省科技支撑计划(11230909D-5); 河北省科技型中小企业创新英才(169A76334H)

STUDY ON THERMODYNAMIC EQUILIBRIUM MODEL OF DOWNDRAFT BIOMASS GASIFIER

Yang Hui1,2, Chen Wenyu1,2, Sun Jiao1,2, Chen Wenyi1,2   

  1. 1. Department of Process Equipment and Control Engineering, Hebei University of Technology, Tianjin 300130, China;
    2. National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China
  • Received:2021-02-05 Online:2022-10-28 Published:2023-04-28

摘要: 建立下吸式生物质气化炉热力学平衡模型,该模型包括焦炭、焦油和气体,并用已公布的实验数据对模型进行验证,均方根(RMS)在1.304~3.814之间,结果表明该模型的预测值与实验数据吻合较好,可认为模型可靠。然后模拟棉秆在下吸式生物质气化炉中以空气和富氧气体2种气化氛围下,不同操作参数(当量比、预热温度和气化炉反应温度)下对棉秆气化的气体组分、热值和产率的影响。模拟结果表明:富氧气体为气化剂时,当量比从0.20增至0.35时,气体中N2含量比空气显著下降,达10%以上,同时发现能提高气体中H2和CO的含量和热值,热值比空气提高约20%。预热温度对气化成分变化影响有限,随预热温度从30 ℃变化到130 ℃,气体的平均热值从空气的5.2 MJ/m3提高到富氧气体的7.0 MJ/m3。随气化炉内反应温度从750 ℃升至1250 ℃,空气和富氧气体2种气化剂下的H2和CO分别从20.94%、26.84%和21.77%、28.67%下降到4.06%、9.12%和10.49%、21.60%,导致气体的热值降低。

关键词: 生物质, 下吸式气化炉, 热力学模型, 富氧气化

Abstract: The thermodynamic equilibrium model of downdraft biomass gasifier was established, which includes coke, tar and gas. The model was verified with published experimental data, and its root mean square(RMS) was between 1.304 and 3.814. The results show that the predicted value of the model is in good agreement with the experimental data, and the model could be considered reliable. Then, the effects of different operating parameters (equivalent ratio, preheating temperature and reaction temperature of gasifier) on gas composition, calorific value and yield of cotton stalk gasification in two gasification atmospheres of cotton stalk downdraft biomass gasifier with air and oxygen-rich gas were simulated. The simulation results show that when the oxygen-enriched gas is used as the gasification agent, with the equivalent ratio from 0.20 to 0.35, the N2 content in the gas is significantly lower than that in the air, decreasing more than 10%. While it was found that the content of H2 and CO and the calorific value in the gas can be increased, and the calorific value is about 20% higher than that with air. The preheating temperature had a limited effect on the change of gasification composition. As the preheating temperature changed from 30 ℃ to 130 ℃, the average calorific value of the gas increased from 5.2 MJ/m3 of air to 7.0 MJ/m3 of oxygen-enriched gas. As the reaction temperature of the gasifier increased from 750 ℃ to 1250 ℃, H2 and CO under the two gasification agents of air and oxygen-enriched gas decreased from 20.94%、26.84% and 21.77%、28.67% to 4.06%、9.12% and 10.49%、21.60%,leading to a decrease in the calorific value of the gas.

Key words: biomass, downdraft gasifier, thermodynamic model, rich oxygen gasification

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