氨热裂解重整制氢及总参数预测模型

Hydrogen production from ammonia pyrolysis reforming and prediction model of ammonia decomposition rate

为了建立精确、快速的氨热裂解重整制氢模型来预测氨分解率,分析了以Ni-TiO_(2)-Al_(2)O_(3)复合物作为催化剂时,氨体积空速、入口温度对氨热裂解制氢反应的影响;确定了在该催化剂下,氨热裂解制氢反应的最佳实验条件;并以Arrhenius定律为基础理论推导出氨分解率与氨体积空速、入口温度之间的关系,建立了氨分解率预测模型,利用实验数据使用1stOpt软件得出了预测模型中参数的具体数值。实验表明:入口温度、氨体积空速对氨分解率均有较显著的影响,并且在较高的入口温度、较低的氨体积空速下更有利于氨分解反应。实验得出反应的最佳实验条件:入口温度为740~780℃,氨体积空速为500~800 h^(-1);所建立的预测模型与实验数据呈显著相关,能很好地预测氨分解率。

The establishment of accurate and rapid ammonia pyrolysis reforming model for hydrogen production is an important part of the study of ammonia-based energy system.The influence of ammonia volume space velocity,inlet temperature and other factors on the pyrolysis reaction of ammonia to hydrogen production with Ni-TiO_(2)-Al_(2)O_(3) complex as catalyst was studied experimentally,and the optimal experimental conditions for the pyrolysis reaction of ammonia under this catalyst were studied.The relationship between ammonia decomposition rate and ammonia volume space velocity and temperature was deduced through theoretical derivation for this reaction,and the prediction model of ammonia pyrolysis decomposition rate was established according to its characteristics,and the prediction model was improved and the parameters were optimized according to the experimental data.The results showed that the optimum experimental conditions were 740~780℃and space velocity 500~800 h^(-1).The established model was significantly correlated with the experimental data,and could well predict the decomposition efficiency of ammonia gas.