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天然气的成分构成会随产地来源变化而不同,使其具有不同的燃烧特性和经济价值.本文利用声吸收谱峰值点随气体成分变化而改变的声分子弛豫现象,提出一种天然气燃烧特性检测理论.它基于两频点上声测量值可合成声吸收谱峰值点,且依赖于频率的声吸收谱可由峰值点重建的物理原理;可利用峰值点对应的特征量——弛豫频率和弛豫吸收最大值与气体成分的关系,从两个维度同时定量检测天然气成分.该理论避免了传统上测量声吸收谱峰值点方法需要不断改变气体腔体压强的问题,还具有无需测量气体密度的优点.
The composition of natural gas will vary with the source of production, which makes it have different combustion characteristics and economic value.In this paper, using the acoustic molecular relaxation phenomenon that the peak of acoustic absorption spectrum changes with the change of gas composition, this paper proposes a method to detect the combustion characteristics of natural gas Theory.It is based on the principle that the acoustical absorption peak at the two frequencies can be synthesized and the acoustic absorption spectrum which depends on the frequency can be reconstructed by the peak point. The relationship between maximum absorption and gas composition and simultaneous quantitative determination of natural gas components from two dimensions is avoided.The theory avoids the traditional measurement of the peak point of acoustic absorption spectrum which needs to continuously change the pressure of the gas chamber and also has the advantages of no need to measure the gas density advantage.