小型甲醇水蒸气重整制氢系统性能测试平台及其实验研究

Research on platform of miniaturized methanol reforming system and its experiments

以1 m^(3)/h(标准状态下,下同)制氢量的甲醇水蒸气重整制氢系统为研究对象,提出了重整制氢工艺流程及系统设计;采用Aspen Plus流程模拟软件建立甲醇水蒸汽重整制氢热力学模型,并对不同工况下的制氢量和气体组分进行数值模拟;同时研制了一套甲醇水蒸气重整制氢系统性能测试平台,并在不同的水醇比、压力及温度等变工况下进行实验研究。实验结果表明,在2.44 MPa、235℃和250℃工况下甲醇转化率达96.75%以上,制氢量达1.7 m^(3)/h,此时甲醇消耗量为5.3 kg,H2产出量约为1.0 kg,验证了搭建系统性能的优异性;对比模拟、实验及文献结果,H2质量流量的模拟和实验结果最大误差为7.41%,CO和CO_(2)质量流量、甲醇转化率及CO选择性等误差均小于1%,模拟及实验结果偏差较小;实验测试制氢量、甲醇转化率和CO浓度增幅与文献结果具有良好的一致性,验证了甲醇水蒸气重整制氢测试平台的可靠性和准确性。

The process flow and system design of methanol reforming system with 1 m^(3)/h(in standard state,the same below)hydrogen production have been proposed.The hydrogen production and gas component were simulated under different operating conditions,which used thermodynamic model of methanol reforming system established by Aspen Plus software.The test platform used to test the performance of methanol reforming system has been built,which could realize performance measurement under different pressure,temperature and steam-methanol ratio.The test results show that the methanol conversion,hydrogen production and ratio of methanol consumption to hydrogen output are 96.5%,1.70 m^(3)/h and 5.3 kg CH3OH,1 kg H2 under pressure of 2.44 MPa,temperature of 235℃and 250℃,respectively,which verified superior performance of test platform.The deviation of simulation and experiment has been compared with error precision of hydrogen mass flow rate less than 7.41%,meanwhile,mass flow rates of CO and CO_(2),methanol conversion and selectivity of CO are less than 1%.By comparing the experiment and reference,the increasing rate of hydrogen production,methanol conversion and selectivity of CO show reasonable consistency,which verify reliability and accuracy of the test platform.