| 摘要 |
<p>PURPOSE:To prevent a nozzle, etc. from being contaminated with the soot and the tar by coaxially disposing an air supply passage about the nozzle of means for refreshing a collecting filter of finely divided particles contained in the exhausted gas by burning up the finely divided particles with high temperature combustion gas from a burner. CONSTITUTION:When a mixture of fuel supplied from a fuel supply passage 1b and air supplied from an atomizing air supply passage 1a is sprayed from a nozzole 1, this sprayed flow 9 is mixed with upstream coaxial air 11a supplied from a spirally turning air supply passage 2 through an upstream air supply port 10 and an upstream coaxial air supply passage 11, and thereafter fired by an ignition plug 5 to be burnt. At this time, a blue flame nucleus is formed in a part of the sprayed flow, and then a flame 7 having an ignition surface in the downstream of a mixing air orifice 10 is formed. This flame 7 is mixed with downstream coaxial air 13a supplied from a downstream coaxial air port 13 and is burnt in a combustion cylinder 6, thereby the nozzle 1, the ignition plug 5, etc. being prevented from the contact with the flame 7 and therefore from the contamination with the soot and the tar.</p> |
