太阳能熔融盐供热的CH_(4)-CO_(2)重整热化学储能反应热力学分析  

Thermodynamic analysis of the CH_(4)-CO_(2)reforming thermochemical energy storage reaction heated by a solar molten salt

作　　者：王洪明[1] 王观竹 WANG HongMing;WANG GuanZhu(Office of Operational Assets Reform and Management,Jilin University,Changchun 130000,China;Logistics Department,Jilin University,Changchun 130000,China)

机构地区：[1]吉林大学经营性资产改革和管理办公室,长春130000 [2]吉林大学后勤处,长春130000

出　　处：《北京化工大学学报（自然科学版）》2024年第3期57-65,共9页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：吉林省科技厅重点研发项目(20200403148SF)。

摘　　要：以太阳能熔融盐为载热工质的CH_(4)-CO_(2)重整热化学反应是极具应用潜力的热化学储能技术,为探讨工业级CH_(4)-CO_(2)重整储能反应器在不同操作条件下热力学性能的变化规律,建立了基于太阳能熔融盐供热的CH_(4)-CO_(2)重整储能反应器的二维拟均相数学模型,通过数值模拟分析了反应混合物进口温度(T_(in))和进口摩尔流率(F_(tot,in))对反应器内温度、反应转化率和热化学储能效率等的影响规律。结果表明:当进口温度较高时(T_(in)=823 K),转化管内温度沿转化管轴向表现为先降低后升高的变化趋势;当进口温度较低时(T_(in)=573K),转化管内温度沿转化管轴向单调升高;T_(in)=573K下,随着进口摩尔流率的增大,反应转化率单调减小,化学储能效率呈现先增大后减小的变化趋势;在进口摩尔流率相同的条件下,进口温度越高,反应转化率和化学储能效率越大;T_(in)=823 K下,随着进口摩尔流率的增大,显热储能效率和热损失率减小,化学储能效率增大;F_(tot,in)=1 mol/s下,随着反应混合物进口温度的升高,化学储能效率与热损失率增大,显热储能效率减小。The CH_(4)-CO_(2)reforming thermochemical reaction with a solar molten salt as the heat carrier is a thermo-chemical energy storage technology with great application potential.In order to investigate the factors governing the changes in the thermodynamic performance of an industrial-grade CH_(4)-CO_(2)reforming energy storage reactor under different operating conditions,a two-dimensional quasi-homogeneous mathematical model of a CH_(4)-CO_(2)reforming energy storage reactor based on solar molten salt heating was established.The effects of varying the inlet temperature(T_(in))and inlet molar flow rate(F_(tot,in))of the reaction mixture on the temperature,reaction conversion and thermochemical energy storage efficiency in the reactor were analyzed by numerical simulation.The results show that when the inlet temperature is high(T_(in)=823 K),the temperature in the conversion tube initially decreases and then increases along the axial direction of the conversion tube.When the inlet temperature is low(T_(in)=573 K),the temperature in the conversion tube increases monotonically along the axial direction of the conversion tube.At T_(in)=573 K,with the increase of inlet molar flow rate,the reaction conversion rate decreases monotonically,and the chemical energy storage efficiency initially increases and then decreases.For the same inlet molar flow rate,increasing the inlet temperature results in higher reaction conversion rate and chemical energy storage efficiency.At T_(in)=823 K,the sensible heat storage efficiency and heat loss rate decrease,and the chemical energy storage efficiency increases with increasing inlet molar flow rate.At F_(tot,in)=1 mol/s,as the inlet temperature of the reaction mixture increases,the chemical energy storage efficiency and heat loss rate increase,and the sensible heat storage efficiency decreases.

关 键 词：太阳能 热化学储能 CH_(4)-CO_(2)重整反应 储能效率 

分 类 号：TK513.5[动力工程及工程热物理—热能工程]