Dilution gas mixing unit and exhaust gas analysis system

Abstract

The present application provides a kind of dilution gas mixing unit and exhaust analysis system, to reduce the influence of mixed gas on background measurement even in the case of reducing dilution ratio and reducing dilution gas flow, dilution gas mixing unit (X) is used for the exhaust analysis system (100) for analyzing mixed gas formed by diluting exhaust gas with dilution gas, dilution gas is mixed with exhaust gas, dilution gas mixing unit (X) has: dilution gas supply pipe (3H) is connected with exhaust gas introduction pipe (21) for introducing exhaust gas, and dilution gas is supplied to the exhaust gas introduction pipe (21);Dilution gas sampling part (250) is arranged in dilution gas supply pipe (3H), and dilution gas is collected;And backflow prevention component (5) is arranged in dilution gas supply pipe (3H) more on the side of exhaust gas introduction pipe (21) than dilution gas sampling part (250), for preventing the backflow of mixed gas in dilution gas supply pipe.

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