H2O-O2气氛下胜利褐煤气化半焦的孔隙特性

2015年第34卷第3期CHEMICAL INDUSTRY AND ENGINEERING PROGRESS ·695·

化工进展

H2O/O2气氛下胜利褐煤气化半焦的孔隙特性

孙加亮，王永刚，王芳，张锟俊，王会，张书

（中国矿业大学（北京）化学与环境工程学院，北京 100083）

摘要：采用实验室气流床反应器，在H2O、O2及其混合气氛，900℃条件下进行了胜利褐煤气化实验，研究了气化半焦的孔隙结构特征。结果表明，在所有气氛下，半焦的吸附等温线均属于第II类型，吸附回线为H3型，褐煤气化半焦具有连续的较完整的孔体系，孔隙结构类似。反应气氛影响气化半焦的孔径分布，半焦中的大孔在3种气氛下均较少，中孔从多到少的顺序是：H2O>O2>H2O+1%O2，微孔与之相反。在水蒸气气氛下，随水蒸气浓度增加，半焦的比表面积先增大后趋于稳定。添加1%O2后，比表面积提升30多倍。低浓度O2气氛下，随O2浓度的增加，比表面积呈线性增长。褐煤转化率与微孔容积和总孔容积的比值以及比表面积的关系式为X=0.196(V m/V)+45.651，X=0.037S+48.066。

关键词：褐煤气化；孔隙；比表面积；气流床反应器

中图分类号：TQ 536.1 文献标志码：A 文章编号：1000–6613（2015）03–0695–06

DOI：10.16085/j.issn.1000-6613.2015.03.016

Porosity characteristics of chars from Shengli brown coal gasification

under H2O/O2 atmospheres

SUN Jialiang，WANG Yonggang，WANG Fang，ZHANG Kunjun，WANG Hui，ZHANG Shu （School of Chemical and Environmental Engineering，China University of Mining and Technology(Beijing)，Beijing

100083，China）

Abstract：Shengli brown coal was gasified by using a laboratory entrained flow reactor at 900℃under the atmospheres of H2O，O2 and their mixture，and pore structure features were investigated. The shapes of adsorption isothermal curves obtained from the chars under various atmospheres were Type II and the shapes of the adsorption loop curves were Type H3. There was a relatively continuous and integral pore system of chars with similar pore structures. Pore diameter distribution was influenced by reaction atmosphere. The quantity of macropores of char was less under all three atmospheres; the order of mesoporesfrom more to less was H2O>O2>H2O+1%O2，and the order of micropores was the reverse. The specific surface area of char presented the trend of increasing at first，then maintaining steady with the increase of H2O. The specific surface area of char during gasification under H2O+1%O2 mixture atmosphere increased by more than 30 times. It increased linearly with the increase of O2 at low concentration of oxygen. The relational expression for conversion versus ratio of micropore volume and total pore volume，and conversion versus specific surface area was X=0.196(V m/V)+

45.651，X=0.037S+48.066.

Key words：brown coal gasification; porosity; special surface area; entrained-flow reactor

褐煤气化是气化剂进入煤体孔隙发生的多相化学反应，主要在固体孔隙的表面进行。气化反应会导致煤焦孔隙结构的改变，而变化的孔隙结构又影收稿日期：2014-10-22；修改稿日期：2014-11-05。

基金项目：国家科技支撑计划项目（2012BAA04B02）。

第一作者：孙加亮（1982—），男，博士研究生。联系人：王永刚，教授，博士生导师。E-mail wyg1960@https://www.wendangku.net/doc/e7803827.html,。