EXHAUST GAS SAMPLING APPARATUS AND EXHAUST GAS ANALYSIS SYSTEM

摘要

In order to provide an exhaust gas sampling apparatus that makes it possible to simplify the entire system using a simple structure flow rate control mechanism having a small variable flow rate range as well as making the accuracy of an exhaust gas dilution ratio higher than before, the exhaust gas sampling apparatus is configured as an exhaust gas sampling apparatus that makes a multistage dilution. In addition, the exhaust gas sampling apparatus is configured to, given that a dilution ratio determined by an n-th diluter in a dilution flow path at an n-th stage as a final stage is R, make dilution ratios determined by diluters in dilution flow paths at the respective stages other than the n-th stage as the final stage substantially equal to (R+1).

主权项

1. An exhaust gas sampling apparatus comprising an n-stage dilution flow path (n is a natural number equal to or more than 2), wherein
a dilution flow path at a k-th stage (k is a natural number from 1 to n) is provided with: a k-th sampling pipe adapted to get exhaust gas or diluted exhaust gas resulting from dilution in a dilution flow path at a (k−1)-th stage; a k-th diluter adapted to dilute with dilution air the exhaust gas or the diluted exhaust gas got through the k-th sampling pipe; a k-th dilution air flow rate control mechanism adapted to control a flow rate of the dilution air flowing into the k-th diluter; and a k-th diluted exhaust gas flow rate control mechanism adapted to control a flow rate of diluted exhaust gas flowing out of the k-th diluter, and the exhaust gas sampling apparatus being configured such that, in the dilution flow paths at the respective stages, flow rates of the exhaust gas and the diluted exhaust gases got through corresponding sampling pipes are controlled in conjunction with a flow rate of the dilution air flowing into the n-th diluter through the dilution air flow rate control mechanism at the n-th stage as a final stage.