State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology

为降低工业有机废弃物糠醛渣气化合成气中焦油含量,一方面通过在糠醛渣气化过程添加高能量密度的煤和有机固废糠醛渣进行共气化,提高气化温度,实现气化焦油的热裂解,提高碳转化率;另一方面通过添加CaO催化裂解焦油,实现糠醛渣原料气化产气的净化,提高糠醛渣原料的元素利用率。通过考察CaO的添加对共热解阶段及共气化阶段产品的影响规律,得到糠醛渣气化产气净化的基础数据。结果表明,CaO作为焦油裂解催化剂可在糠醛渣热解阶段提高热解反应速率,促进原料向轻质油和气体分子转化;糠醛渣/煤共气化过程,与不添加CaO相比,机械混合法添加的CaO可使共气化焦油脱除率达17.42%,而浸渍法添加的CaO可使焦油脱除率达69.41%,同时提高焦油轻质化程度;升温和提高CaO的添加比例均可使共气化产气中焦油浓度下降并提高气体产率;此外,通过采用X射线衍射光谱(XRD)和扫描电子显微镜(SEM)对气化后的固体残渣进行分析,由于CaO的助熔作用,1000℃时,共气化会出现灰团聚现象。

In order to reduce the tar content in the gasification syngas of industrial organic waste furfural residue, on the one hand, increased the gasification temperature in the furfural residue gasification by adding high energy density coal and organic solid waste furfuralresidue for co-gasification to achieve thermal cracking of gasification tar and improve the carbon conversion. On the other hand, CaO catalysts was introduced to crack the tar, which enabled the purification of the syngas and increased the elemental utilization of the furfuralresidues gasification. In this study, the effect of CaO addition on the products in co-pyrolysis stage and co-gasification stage was investigated to supplement the basic data of syngas purification in furfural residue gasification. The results show that CaO can improve the pyrolysis rate and promote the transformation of raw materials to light oil and syngas during the furfural residue pyrolysis stage. In the furfuralresidues and coal co-gasification, compared with no catalysis added gasification, 17.42% of tar can be thermal cracking when CaO is added in a mechanical mix as mechanical mixing, while the CaO is added by impregnation method can make the tar removal rate up to69.41%, and the degree of tar lightening is improved. Both increasing temperature and adding CaO can decrease tar concentration and increase gas yield in co-gasification. In addition, X-ray diffraction spectroscopy (XRD) and scanning electron microscopy (SEM) wereused to analyze the solid residue after gasification. Due to the fluxing effect of CaO, ash agglomeration occurs at 1 000 ℃ .

山西省自然科学基金资助项目(20210302124096)

陈玉卓,宋云彩,冯杰.CaO 对糠醛渣/ 煤共气化过程中产品的影响规律[J].洁净煤技术,2023,29(12):51-58.

CHEN Yuzhuo,SONG Yuncai,FENG Jie.Influence of CaO on furfural residue/ coal co-gasification products[J].Clean CoalTechnology,2023,29(12):51-58.