化学反应体系中电磁脉冲的频谱变化

doi:10.11949/j.issn.0438-1157.20181405

摘要/Abstract

摘要：

微波辅助化学反应引起人们的大量关注，但非均匀加热等问题严重限制了微波在化学工业中的广泛应用。为了解决这些问题，就需要研究化学反应体系中电磁波的传播规律。化学反应体系作为一种典型的时变非平衡系统，其介电特性随着化学反应进行而变化，而介电特性变化将影响反应体系内的电磁波频率。以简单极性分子反应的极化特性表征为基础，通过数值计算不同反应速率的反应体系中电磁脉冲的传播，揭示了反应体系时变和色散的电磁特性对电磁脉冲频谱的影响。对于较慢的化学反应，可以忽略反应体系的时变特性，反应体系的色散特性引起电磁脉冲频谱的变化；对于较快的化学反应，反应体系的时变和色散特性同时引起电磁脉冲频谱的变化。

关键词: 化学反应, 简单极性分子反应, 频谱变化

Abstract:

Microwave-assisted chemical reactions have been attractive. However, the problems of inhomogeneous heating have been preventing the further application of microwaves in chemical engineering. In order to solve these problems, the characteristics of electromagnetic wave propagation in chemical reactions need to be investigated. As a typical time-varying and non-equilibrium system, the dielectric properties of chemical reactions change during chemical reactions. Moreover, the frequency of the electromagnetic waves in the reactions can be influent by the variation of dielectric properties. In this paper, based on the polarization characteristics of the simple polar-molecule reactions, the propagation of electromagnetic pulses in the reactions with different reaction rates is simulated to disclose the effects of the time-varying and dispersive characteristics on the spectrum of electromagnetic pluses. For slow reactions, the time-varying characteristics are negligible, and the dispersive characteristics leads to the spectrum variation. For fast reactions, the time-varying and dispersive characteristics make the spectrum changes of electromagnetic pluses.

Key words: chemical reactions, simple polar-molecule reactions, spectrum changes

中图分类号:

TN 015

刘兴鹏, 严丹丹. 化学反应体系中电磁脉冲的频谱变化[J]. 化工学报, 2019, 70(S1): 177-181.

Xingpeng LIU, Dandan YAN. Spectrum changes of electromagnetic pluses in chemical reactions[J]. CIESC Journal, 2019, 70(S1): 177-181.

图/表 3

图1 调制Gauss脉冲在一般色散媒质中的输入和输出

Fig.1 Input and output of modulated Gaussian pulse in general dispersive media

图2 当 Xi 组分浓度变小时输出电场

Fig.2 Output electric field in reactions when concentrations of Xi decrease

图3 当 Xi 组分浓度变大时输出电场

Fig.3 Output electric field in reactions when concentrations of Xi increase

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