汽油挥发气远程监测性能参数影响分析  

Parameter Analysis on Remote Gas Monitoring Performance of Gasoline Vapors

作　　者：汪冉冉[1] 孟云霞[1] 俞琳[1] 王立恒[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072

出　　处：《纳米技术与精密工程》2015年第4期299-304,共6页Nanotechnology and Precision Engineering

摘　　要：本文设计了一套汽油挥发气远程监测系统,利用汽油挥发气在中红外波段的吸收光谱进行浓度检测,研究了现场测试条件下检测系统的性能参数对测量结果的影响.文中采用功率加权法计算吸收光谱的吸光度值,并通过仿真和实验分析了采样过程中影响气体浓度监测的相关因素.结果表明,气体流量对平衡时间和测量浓度的影响较小,在达到平衡后测量误差小于7%;而采样距离对结果影响较大,在15 m时,误差达到了18%,修正后误差可控制在4%以内;真空度与浓度之间呈现良好的线性度.通过实验和仿真数据分析,可以对实际测量的浓度进行修正,减小测量误差,为现场测试提供数据参考.A remote gas monitoring system was constructed in this paper. The concentrations of gasoline vapors were measured based on the absorption spectrum at the mid-infrared band, and the influence of various parameters under the field test conditions was investigated. The weighted average algorithm was adopted to calculate the absorbance value. This paper analyzed the factors affecting gas concentration dur- ing the sampling process through simulation and experiments. Results show that the gas volume flow has little influence on the concentration measurement and equilibration time with an error of less than 7%. However, the sampling distance exerts great influence and the error even grows to 18% at the sampling distance of 15 m, which may be kept within 4% after calibration. The relationship between the vacuum pressure and the concentration is linear. Through the analysis on simulation and experiments, the meas- ured concentration can be calibrated to match the true value, providing reference for detection in field

关 键 词：吸收光谱 气体远程监测 汽油挥发气 参数分析 

分 类 号：TE626.21[石油与天然气工程—油气加工工程] TP274[自动化与计算机技术—检测技术与自动化装置]