Absolute and relative emissions analysis in practical combustion systems—effect of water vapor condensation
Absolute and relative emissions analysis in practical combustion systems—effect of water vapor condensation
复制标题
实际燃烧系统中的绝对和相对排放分析——水蒸气冷凝的影响
DOI：
10.1088/0957-0233/27/11/117002
复制
发表时间：
2016
影响因子：
2.4
通讯作者：
P. DesJardin
中科院分区：
文献类型：
--
作者：
J. P. Richter;J. Mollendorf;P. DesJardin
在汽车、飞机、加工、加热和空调行业中，准确了解燃烧气体的绝对成分是非常必要的，因为这些行业都非常关注减排问题。这些行业使用各种传感器技术。这些传感器中的许多传感器用于通过将样品泵送通过管道系统到达远程传感器位置来分析气体。这种类型的采样策略的固有特性是混合物状态随着样品被吸向传感器而改变。具体而言，温度和湿度变化可能是显著的，导致与原位位置相比，传感器界面处的气体混合物非常不同（水蒸气稀释效应）。因此，从远程采样气体分析仪获得的气体浓度可能与现场值有很大不同。在这项研究中，固有的误差与采样燃烧气体浓度测量进行了探讨，并提出了一种校正方法，以确定从远程测量的气体物种浓度的绝对气体成分。对于原位（湿）测量，使用加热的二氧化锆（ZrO 2）氧传感器（Bosch LSU 4.9）测量绝对氧浓度。这用于校正远程分析仪（Testo 330-2LL）内电化学传感器进行的远程采样（干式）测量。在这项研究中，这样的校正实验验证了一氧化碳的特定浓度（5020 ppmv）。
Accurate knowledge of the absolute combustion gas composition is necessary in the automotive, aircraft, processing, heating and air conditioning industries where emissions reduction is a major concern. Those industries use a variety of sensor technologies. Many of these sensors are used to analyze the gas by pumping a sample through a system of tubes to reach a remote sensor location. An inherent characteristic with this type of sampling strategy is that the mixture state changes as the sample is drawn towards the sensor. Specifically, temperature and humidity changes can be significant, resulting in a very different gas mixture at the sensor interface compared with the in situ location (water vapor dilution effect). Consequently, the gas concentrations obtained from remotely sampled gas analyzers can be significantly different than in situ values. In this study, inherent errors associated with sampled combustion gas concentration measurements are explored, and a correction methodology is presented to determine the absolute gas composition from remotely measured gas species concentrations. For in situ (wet) measurements a heated zirconium dioxide (ZrO2) oxygen sensor (Bosch LSU 4.9) is used to measure the absolute oxygen concentration. This is used to correct the remotely sampled (dry) measurements taken with an electrochemical sensor within the remote analyzer (Testo 330-2LL). In this study, such a correction is experimentally validated for a specified concentration of carbon monoxide (5020 ppmv).