加氢热解煤焦的气化特性及理化性质研究

发布时间：2018-04-22 01:09

  本文选题：加氢热解 + 煤焦　； 参考：《华东理工大学》2015年硕士论文

【摘要】：本文以利用加氢煤焦制取氢气为目的,通过与非加氢煤焦对比,研究了加氢煤焦的气化反应特性和理化性质,主要内容包括以下三个方面：首先,以小型固定床装置加氢热解产出的两种煤焦——玉溪(YX)和准东(ZD)煤焦为研究对象,采用热重分析仪和固定床气化装置分别进行了二氧化碳和水蒸气气化实验。结果表明,ZD煤焦的气化反应性好于YX煤焦；在相近的热解转化率下,加氢煤焦的气化反应性好于非加氢煤焦；加压有利于提高煤焦的气化反应性,但随着氢压的升高,气化反应性变差；延长热解停留时间使煤焦的气化反应性降低。随着煤焦水蒸气气化温度的提高,氢气和二氧化碳的浓度降低,一氧化碳的浓度增升高,1050℃时反应基本达到了热力学平衡状态。其次,对中试气流床装置产出的两种加氢煤焦——府谷(FG)和印尼(YN)煤焦进行了水蒸气气化实验,并利用XRF、SEM、BET、TG和XRD等分析方法考察了加氢煤焦和非加氢煤焦的理化性质。结果表明,YN煤焦的气化反应性好于FG煤焦；相比非加氢煤焦,加氢煤焦的碱金属含量高,孔隙结构发达,活性点多,但是比表面积小,石墨化程度高,总体上加氢煤焦的气化反应性好于非加氢煤焦。最后,利用物料和能量平衡进行了FG和YN煤焦水煤浆气化过程的计算,得到了不同氧煤比条件下气化产生的有效气成分和气化效率。结果表明,随着氧煤比提高,有效气成分含量逐渐增大,而气化效率逐渐降低。
[Abstract]:In this paper, the gasification reaction characteristics and physicochemical properties of hydrogenated char are studied by comparing with non-hydrogenated char to produce hydrogen. The main contents are as follows: firstly, Two kinds of char (Yuxi YX) and ZD (ZD) coke produced by hydropyrolysis in a small fixed bed unit were used as research objects. CO2 and steam gasification experiments were carried out by thermogravimetric analyzer and fixed bed gasification unit, respectively. The results show that the gasification reactivity of ZD char is better than that of YX char, the gasification reactivity of hydrogenated char is better than that of non-hydrogenated char under similar pyrolysis conversion, the gasification reactivity of char is improved by pressurization, but with the increase of hydrogen pressure, the gasification reactivity of char is better than that of YX char. The gasification reactivity became worse and the gasification reactivity of char decreased with the prolongation of pyrolysis residence time. With the increase of gasification temperature of coal char steam, the concentration of hydrogen and carbon dioxide decreases, and the concentration of carbon monoxide increases to 1050 鈩，

本文编号：1784917