熔融盐对合成气成分影响模型  

Modeling for effect of molten salts on syngas composition

作　　者：王小波[1,2] 赵增立[1,2] 刘安琪[1,2] 武宏香[1,2] 李海滨[1,2] 陈勇[1,2] 

机构地区：[1]中国科学院广州能源研究所,广东广州510640 [2]中国科学院可再生能源与天然气水合物重点实验室,广东广州510640

出　　处：《化工学报》2012年第6期1697-1703,共7页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2011CB201500);中国科学院知识创新工程重要方向项目(KSCX2-EW-G-1-5);国家自然科学基金项目(50776091)~~

摘　　要：气化粗合成气主要成分为CO、CO2、H2,经过变换和重整后在催化剂作用下可以合成不同的化学品。熔融盐可吸收粗合成气中的CO2,并实现H2/CO(体积比)在1.5～2.9之间调整。熔融盐合成气成分调整过程是一个传质与化学反应同时进行的非平衡、耦合过程。从球体扰流方程和反应动力学方程出发,通过量纲分析推导出合成气组分与操作条件的关系,对固定床内熔融盐对合成气成分调整过程进行了分析。熔融盐合成气成分调整的限制过程为气体从气泡表面向熔融盐内部的传质过程。温度升高、气泡直径减小、停留时间增加有利于合成气中H2体积分数增加;对模型进行了实验验证,实验结果与理论结果吻合良好。Raw syngas mainly contains H2,CO,CO2,and different chemicals may be synthesized after shifting and reforming of raw syngas.Molten salts have the ability of absorbing CO2 and adjusting H2/CO ratio.This experiments in a fixed bed reactor passing syngas through molten salts showed that H2/CO ratio could be adjusted between 1.5—2.9,and there was nearly no CO2 in syngas after being treated with molten salts.The process of syngas composition adjustment using molten salts was a non-equilibrium,coupled process.The relationship between syngas composition and operation conditions were obtained from equation for flow around ball and chemical reaction kinetics by means of dimensional analysis.The rate limiting step of syngas composition adjustment using molten salts was mass transfer between gas bubble surface and molten salts.Temperature and liquid height had a greater impact on syngas composition,while gas bubble diameter had less impact.Percentage composition of H2 could be increased by rising the temperature,reducing gas bubble diameter and increasing residence time.The model was verified by experiment,and experiment data and the modal agreed well.

关 键 词：熔融盐 合成气 气化 模型 

分 类 号：X705[环境科学与工程—环境工程] TK6[动力工程及工程热物理—生物能]