热化学硫碘制氢系统中硫酸分解反应器的换热性能  

Heat transfer performance of sulfuric acid decomposition reactor in thermochemical sulfur iodine hydrogen production system

作　　者：李明阳[1,2] 别亦然 何勇 王博[2] 王晓丁 王智化 LI Mingyang;BIE Yiran;HE Yong;WANG Bo;WANG Xiaoding;WANG Zhihua(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou310027,China;Electric)

机构地区：[1]浙江大学能源高效清洁利用全国重点实验室,浙江杭州310027 [2]东方电气股份有限公司,四川成都611731

出　　处：《洁净煤技术》2024年第6期180-188,共9页Clean Coal Technology

基　　金：中央高校基本科研业务费专项资金资助项目(2022ZFJH04);国家重点研发计划资助项目(2023YFE0114400)。

摘　　要：硫酸分解反应器作为热化学硫碘制氢系统中的重要设备,其换热需要匹配系统的产氢量换热需求。为研究硫酸分解反应器不同结构对换热的影响,使反应器的换热满足系统需求,同时满足制造工艺的限制。通过试验对硫酸分解反应进行反应动力学参数标定并建立反应动力学模型,用gPROMS软件对反应器进行仿真,得到反应器内的压力、温度、流量和各组分浓度等参数。结果表明:反应器总长度不变,调整预热段和反应段长度比或提高填充颗粒热导率无法提升总转化率。反应器增加预热段长度可显著增加总转化率,关键原因是预热段长度决定了反应器内温度能否达到SO3分解反应所需最佳温度850℃。减小反应器直径并不能增加总转化率,虽然反应器的直径减小有利于传热,但由于整体入口流量不变,流体流速显著提高,减少了反应物的停留时间,同时还会显著增加反应器流阻。采用套筒环腔内、外加热结构作为反应器预热段可有效提高总转化率。采用内外同时加热时,增加了换热面积,有利于缩短预热段长度,预热段长度仅需900 mm左右反应器出口温度即可达到850℃,得到了符合要求的反应器结构设计。The sulfuric acid decomposition reactor is an important equipment in the thermochemical sulfur iodine hydrogen production sys-tem,its heat transfer needs to match the hydrogen production capacity of the system.In order to study the effect of different structures of sulfuric acid decomposition reactors on heat transfer,and to ensure that the heat transfer of the reactor meets the system requirements while also meeting the limitations of manufacturing processes.Through experiment,the reaction kinetics parameters of sulfuric acid decomposi-tion reaction were calibrated and a reaction kinetics model was established.The reactor was simulated by gPROMS to obtain parameters such as pressure,temperature,flow rate,and component concentrations within the reactor.Results show that the total conversion rate can not be improved by adjusting the length ratio of the preheating section and the reaction section or increasing the thermal conductivity of the packed particles,while the total length of the reactor remains unchanged.Increasing the length of the preheating section in the reactor can significantly increase the total conversion rate.The key reason is that the length of the preheating section determines whether the tempera-ture inside the reactor can reach the optimal temperature of 850℃required for the SO3 decomposition reaction.Reducing the reactor diam-eter does not increase the total conversion rate,although reducing the diameter of the reactor is beneficial for heat transfer,due to the un-changed inlet flow rate,the fluid flow rate increases significantly,reducing the residence time of the reactants and significantly increasing the reactor flow resistance.Using a sleeve annulus internal and external heating structure as the preheating section of the reactor can effec-tively improve the total conversion rate.When both internal and external heating are used,increasing the heat transfer area is beneficial for shortening the length of the preheating section.The length of the preheating section requires about 900 mm to

关 键 词：热化学制氢 硫碘循环 硫酸分解反应器 gPROMS 反应器结构 

分 类 号：TK91[动力工程及工程热物理]