微细腔内甲烷湿空气低温重整特性热力学分析.pdf

物理化学学报( Wuli Huarue Xuebao)
November
Acta Phy.-Chim.Sin.2010,26(11):2899-2906
2899
Article
www.whxb.pku.edu.cn
微细腔内甲烷湿空气低温重整特性热力学分析
冉景煜赵柳洁
(重庆大学动力工程学院,重庆40004
摘要:从理论上探讨低温(小于973K)、斥力、空碳比及水碳比对重整特性及甲烷转化率的影响,以及各参数的
合理取值范围;同时,对甲烷自热重整系统与无氧重整系统进行了性能对比.研究结果表明:微细腔在温度大于
633K,反应压力小于0.10MPa,空碳(摩尔)比为2.0以及水碳摩尔比在1.0-2.5之间有利于甲烷自热重整反应的
发生;自热重整与无氧重整体系相比,当甲烷质量流量一定时,有氧系统可以在较低的水碳比和较低的温度条件
下获得较高的甲烷转化率和氢气产量
关键词:微细腔;低温;自热重整;热力学分析;无氧系统;对比
中图分类号:O642
Thermodynamic Analysis of Low Temperature Methane Wet-air
Reforming in a Microcombustor
RAN Jing-yu ZHAO Liu-jie
(College of Thermal Power Engineering, Chongging University, Chongqing 400044, PRChina
Abstract We studied the effects of reaction pressure, molar ratios of air to methane and steam to methane on the
reforming process at temperatures below 973 K theoretically. Their reasonable ranges were also studied. We also
compared the performance of a methane autothermal reforming system and a non-oxygen system. Results show that
methane autothermal reforming occurs much more easily at temperatures above 633 K, reaction pressures below 0.10
Mpa. a molar ratio of air to methane of 2.0. and a molar ratio of steam to methane between 1.0 and 2.5. At a definite
methane mass flow, a higher methane conversion rate and hydrogen yield can be obtained at lower temperatures and in
lesser steam to methane ratio in an autothermal reforming system compared with a non-oxygen systcm
Key Words: Micro-combustor; Low temperature; Autothermal reforming; Thermodynamic analysis
Non-oxygen system; Contrast
在微细腔中加氢来保持燃料燃烧的稳定和不熄氢技术与甲烷水蒸气重整相比,变外供热为自供热
火是很多科研人员研究的热点,氢气的加人扩展了反应热量利用较为合理,既可以限制反应器内的高
燃料的着火极限,并降低着火温度.有学者将氢气直温,又降低了体系的能耗,从而比较容易实现在微
接加入到燃料气中用来改善燃烧;也有学者提出细腔初始段的低温和欠氧环境中产氢.目前甲烷自
可利用甲烷水蒸气的高温(1100K左右)重整,使产热重整的研究主要集中在大空间下不同反应器和不
生的部分氢气混入尚未燃烧或正在燃烧的混合气同催化剤对获取大量合成气产生的影响,而对微
中,从而改善燃料的着火、燃烧特性同;自热重整制细腔燃烧特性与催化重整的研究基本围绕高温环境
Received: April 12, 2010; Revised: July 9, 2010; Published on Web: September 28, 2010.
Correspondingauthor.Emai]:ranjy@cqu.edu.cn;Tel:+86-23-65103114
The project was pored by the National Natural Science Foundation of China(50861 18)and New Century Excellent Talent Project of Ministry of
Education, China(NCET-08-0605
国家自然科学基金(50876118)和教育部新世纪优秀人才计划( NCET-08-0605)资助项目
C Editorial office of Acta Physico-chimica Sinica