加热方式对甲醇蒸汽重整特性的影响  

Effect of heating method on characteristics of methanol steam reforming

作　　者：王强 任衍伦[1] 况晓刚 张莉[1] WANG Qiang;REN Yan-lun;KUANG Xiao-gang;ZHANG Li(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学机械与动力工程学院,上海200237

出　　处：《化学工程》2022年第9期12-16,共5页Chemical Engineering(China)

摘　　要：为了进一步提升重整器的热效率和启动特性,设计了一种紧凑型内部加热管式反应器用于甲醇蒸汽重整现场制氢。对比研究了内外2种加热方式对反应器启动性能、床层温度分布、甲醇转化率和反应器热效率的影响。结果表明:与外部加热相比,内部加热仅需8%的加热功率即可达到反应温度,且启动时间减少了46.2%。内部加热时由反应导致的温差,以及反应温度和空速对床层温度分布的影响均小于外部加热,甲醇转化率优于外部加热。反应器热效率随着反应温度的增大略微减小,但随着空速的增大而增大。当空速为4000 mL/(g·h)时,采用内部加热的反应器热效率为75.4%,为外部加热的2.2倍,甲醇转化率比外部加热时提升7.2%。该内部加热反应器可用于调节电网负荷的分布式制氢场合。In order to further improve the thermal efficiency and startup characteristics of the reformer,a compact tubular reactor with internal heating was designed for on-site hydrogen production by methanol steam reforming.The effects of internal and external heating on start-up performance,catalyst bed temperature distribution,methanol conversion and reactor thermal efficiency were comparatively investigated.The results show that with the internal heating,the reaction temperature can be achieved with only 8%of the external heating power,and the start-up time is reduced by up to 46.2%as well.With internal heating,the temperature difference caused by methanol steam reforming,and the influence of reaction temperature and gas hourly space velocity(GHSV)on the temperature distribution of the catalyst bed are less than that of external heating,and therefore the methanol conversion is higher than that with external heating.The thermal efficiency of the reactor decreases slightly with the increase of reaction temperature,but increases with the increase of GHSV.When GHSV is 4000 mL/(g·h),the thermal efficiency of the reactor with internal heating is 75.4%,2.2 times that with external heating,and the methanol conversion is 7.2%higher than that with external heating.This internal heating reactor can be applied to the distributed hydrogen production that is used to regulate the grid loads.

关 键 词：内部电加热 甲醇水蒸气重整 快速启动 热效率 温度分布 管式反应器 

分 类 号：TQ116.2[化学工程—无机化工]