Natural Draft Combustion Mixer

Abstract

A natural draft combustion mixer in which the primary air intake is positioned downstream from the point of fuel introduction and also consists of a heat return port for orifice freeze protection that is located adjacent to the orifice, as well as a removable orifice holder for ease of access to the orifice during maintenance and set-up of a combustion system.

1 . The relocation of the primary air introduction being downstream of the orifice will prevent heat loss from the orifice due to very cold combustion air passing over and striping valuable heat from the orifice. 
     
     
         2 . The relocation of the orifice preheat port, to a position directly adjacent to the orifice, draws high temperature POC directly down and across the orifice which heats the orifice preventing the build-up and accumulation of ice, thus, preventing freeze-off of the orifice. 
     
     
         3 . A removable orifice holder that allows the user to perform maintenance or set-up on the orifice without dismantling the assembly and removing it from the combustion chamber.