Diluter, analysis system, and analysis method

An analysis system comprising:

• a diluter configured to mix a sample gas containing particulate matter with a dilution gas to generate a diluted sample gas;
• and
• an analyzing unit configured to analyze the particulate matter contained in the diluted sample gas, wherein
• the diluter includes:
• an inflow portion configured to allow the sample gas containing particulate matter to flow in;
• a mixing portion having an inner diameter larger than that of the inflow portion, configured to mix the sample gas flowing in from the inflow portion with a dilution gas in an internal space to generate a diluted sample gas;
• a discharge portion configured to discharge the diluted sample gas;
• a connection portion configured to connect the inflow portion and the mixing portion, and having a first tapered part whose inner diameter increases from a side connected to the inflow portion toward a side connected to the mixing portion;
• and
• an introduction portion configured to introduce the dilution gas into the internal space from a position downstream of the connection between the first tapered part and the inflow portion, wherein the introduction portion has a plurality of introduction ports arranged along an inflow direction of the sample gas in a side wall of the mixing portion, and wherein the introduction ports are inclined downstream relative to the inflow direction of the sample gas to the internal space, and introduces the dilution gas into a downstream side of the internal space.

An analysis method using an analysis system comprising:

• a diluter including an inflow portion, a mixing portion having an inner diameter larger than that of the inflow portion, a discharge portion, a connection portion configured to connect the inflow portion and the mixing portion and having a first tapered part whose inner diameter increases from a side connected to the inflow portion toward a side connected to the mixing portion, an introduction portion configured to introduce a dilution gas from a position downstream of the connection between the first tapered part and the inflow portion, wherein the introduction portion has a plurality of introduction ports arranged along an inflow direction of the sample gas in a side wall of the mixing portion, and wherein the introduction ports are inclined downstream relative to the inflow direction of the sample gas to the internal space, and introduces the dilution gas into a downstream side of the internal space;
• and an analyzing unit, the method comprising:
• mixing a sample gas containing particulate matter flowing in from the inflow portion with the dilution gas introduced from the introduction portion, in the internal space of the mixing portion to generate a diluted sample gas;
• and
• analyzing the particulate matter contained in the diluted sample gas using the analyzing unit.