| 摘要 |
PROBLEM TO BE SOLVED: To adjust a diluted exhaust gas flow rate allowed to flow into an analytical instrument to a predetermined value in an exhaust gas sampling apparatus configured in such a way that a heat exchanger is not arranged on the upstream of a CVS.SOLUTION: The exhaust gas sampling apparatus includes: a main flow passage 4 in which diluted exhaust gas is caused to flow; a CVS 5 provided in the main flow passage 4; a diluted exhaust gas sampling flow passage 6 for introducing a part of diluted exhaust gas sampled from the main flow passage 4 into an analytical instrument 10; a flow rate control mechanism 7 for controlling a diluted exhaust gas flow rate sampled in the diluted exhaust gas sampling flow passage; and a control device 8 for setting a flow diversion ratio of the diluted exhaust gas flow rate sampled in the diluted exhaust gas sampling flow passage 6 to a diluted exhaust gas flow rate flowing in the CVS 5. The control device 8 sets a flow diversion ratio (Q/Q) so that diluted exhaust gas flow velocity (V) of diluted exhaust gas flowing into the analytical instrument 10 becomes a predetermined value by using a diluted exhaust gas flow rate (Q) flowing in the CVS 5 or a value (Tor P) related to the diluted exhaust gas flow rate (Q). |
