基于声吸收谱峰值点的天然气燃烧特性检测理论  

A theory for monitoring combustion of natural gas based on the maximum point in sound absorption spectrum

作　　者：张克声[1] 陈刘奎[2] 欧卫华[3] 蒋学勤[1] 龙飞[4,1] 

机构地区：[1]贵州理工学院信息工程学院,贵阳550003 [2]重庆科技学院电气与信息工程学院,重庆404100 [3]贵州师范大学数学与计算科学学院,贵阳550001 [4]贵州大学智能信息处理研究所,贵阳550025

出　　处：《物理学报》2015年第5期226-233,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61461008;61402122;61371139);贵州理工学院高层次人才引进项目(批准号:XJGC20140601);重庆市自然科学基金(批准号:cstcjj A40041);重庆市教委科学技术研究项目(批准号:KJ131422)资助的课题~~

摘　　要：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.Compositions of natural gases are different between each other because of different sources, resulting in the fact that natural gases have different energy contents and monetary value. This paper presents a theory to monitor the combustion properties of natural gas by using the acoustic relaxation phenomenon in which the maximum point of acoustic spectrum varies with gas composition. The theory is developed from the frequency-dependent sound absorption spectrum which can be reconstructed from its maximum point synthesized in the acoustic measurements at two frequencies. The theory uses the relation between the two values of the maximum point （i.e. the relaxation frequency and the maximum relaxational absorption） and gas composition to quantitatively monitor the gas. Moreover, the theory has the advantages of avoiding the detection of the gas density and the variation of the ambient pressure, which is necessary in the traditional way of measuring the maximum point of sound absorption spectrum.

关 键 词：分子弛豫 气体检测 声吸收谱 声传感器 

分 类 号：TE642[石油与天然气工程—油气加工工程]