摘要
建立干桦木屑在下吸式固定床气化炉中的Aspen Plus气化模型,该模型预测煤气组成和煤气热值,与文献试验结果吻合良好。利用灵敏度分析模块模拟了氧碳比、CO_(2)/C对气化结果的影响,并提出O_(2)/CO_(2)分段气化流程,对比常规的CO_(2)气化特征,分析了CO_(2)/C对气化结果的影响。结果表明,纯氧气化时可获得高H_(2)和CO浓度的气化气,但其净CO_(2)排放量较高,氧碳比增加使碳转化率逐渐增加、冷煤气效率先增加后降低;CO_(2)作为气化剂时,随着CO_(2)/C的增加,净CO_(2)排放量逐渐减少,但碳转化率及冷煤气效率大幅降低;与常规CO_(2)气化相比,O_(2)/CO_(2)分段气化在保持低CO_(2)排放量的同时,可有效增加气化过程中的碳转化率及冷煤气效率。
An Aspen Plus gasification model for dry birch chips in a downdraft fixed-bed gasifier was developed,in which the predicted the gas composition and gas calorific value and agreement well with the literature results.The sensitivity analysis module was used to simulate the effects of oxygen carbon ratio and CO_(2)/C on gasification results,and the staging gasification process of O_(2)/CO_(2)was proposed.Compared with the conventional CO_(2)gasification characteristics,the influence of CO_(2)/C on gasification results was analyzed.The results show that the gasification gas with high H_(2) and CO concentrations can be obtained with pure oxygen gasification,but its net CO_(2) emission is high,and the carbon conversion ratio gradually increases and the cold gas efficiency first increases and then decreases with the increase of oxygen to carbon ratio.When CO_(2) is used as gasification agent,the net CO_(2) emission decreases gradually with the increase of CO_(2)/C,but the carbon conversion and cold gas efficiency decrease greatly.Compared with conventional CO_(2)gasification,O_(2)/CO_(2) staged gasification can effectively increase carbon conversion and cold gas efficiency while maintaining low CO_(2) emission.
作者
郑志行
张家元
李俊宇
龚卡
罗晓倩
李谦
Zheng Zhihang;Zhang Jiayuan;Li Junyu;Gong Ka;Luo Xiaoqian;Li Qian(College of Energy Science and Engineering,Central South University,Changsha 410083,China;National Engineering Research Center of Sintering and Pelletizing Equipment System,Zhongye Changtian International Engineering Co.,Ltd.,Changsha 410205,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2022年第6期239-245,共7页
Acta Energiae Solaris Sinica
基金
湖南省自然科学基金(2020JJ5994)。
作者简介
通讯作者:李谦(1991—),男,博士、工程师,主要从事生物质热解气化技术方面的研究。liqiancie@163.com。
