射流搅拌反应器中NH_(3)热解特性研究

Study of NH_(3)Thermal Decomposition Characteristics in a Jet-Stirred Reactor

利用射流搅拌反应器实验研究了宽范围条件下NH_(3)热解的反应动力学特性,并利用实验数据对不同NH_(3)化学反应机理模型的预测效果进行了验证。结果表明,NH_(3)热解析氢的最低温度发生在850 K左右,随着热解温度的升高,H_(2)浓度呈现出先增后降再增的趋势。反应系统中H_(2)O的存在对NH_(3)热解析氢具有抑制作用,而停留时间则起到促进作用。目前,仍需进一步优化NH_(3)热解反应机理模型,提高其预测精度。本文的实验数据将对后续机理优化工作提供重要的基础验证数据。

Thethermal decomposition reaction kinetic characteristics of NH_(3)was studied using a jet-stirred reactor under wide range of operating conditions,and the predictability of different NH_(3)reaction mechanisms was evaluated based on the experimental measuring data.It is shown that,the minimum onset temperature of H_(2)production from NH_(3)pyrolysis is 850 K,and the H_(2)concentration firstly increases then decreases and finally increases as reaction temperature glows up.The presence of H_(2)O in reaction system plays a negative effect on NH_(3)thermal decomposition,while the residence time has an accelerating effect.At present,it is still necessary to further optimize the NH_(3)thermal decomposition reaction kinetic model,to improve its predicting accuracy.The experimental data of this work will provide important fundamental database for the subsequent optimization effort.