Exhaust gas analyzer

Abstract

An SOF measuring system that can continuously measure SOF and a soot measuring system that can continuously measure soot are connected with an exhaust gas line. The soot measuring system comprises a diluter that selectively dilutes either one of the exhaust gas and standard gas whose hydrocarbon concentration is known with diluent gas and extrudes it. A dilution ratio adjusting device can adjust a dilution ratio of the diluter. A soot detector continuously detects soot in the exhaust gas or the standard gas diluted by the diluter. The SOF measuring system can be connected with the diluter so that an exhaust gas analyzer can measure the hydrocarbon concentration in the standard gas diluted by the diluter.

1 . A mixing system comprising:
 a mixer wherein a narrow part whose flow path diameter is narrowed and a diffusible part whose flow path diameter is extended are serially arranged on an internal main path through which mixing gas passes so as to form a negative-pressure area that is negative-pressured because the mixing gas is accelerated and that sucks mixed gas through a communicating path communicating with the negative-pressure area and mixes the mixed gas with the mixing gas and then extrudes it; and   a mixing ratio adjusting device that changes a flow amount of the mixing gas introduced into the mixer within a range where a flow amount of the mixed gas sucked by the mixer is kept generally constant by a predetermined operation from outside.   
   
   
       2 . The mixing system of  claim 1 , wherein a gas component detector is connected with a gas extruding port of the mixer and can continuously detect a component of the mixed gas. 
   
   
       3 . The mixing system of  claim 1 , wherein the mixing ratio adjusting device comprises a pressure regulator arranged on a mixing gas line through which the mixing gas flows, a flow rate of the mixing gas introduced into the mixer from the mixing gas line is changed by an operation to adjust pressure of the pressure regulator.