through the igniter to create an igniter flame 9 which impinges on the stream of pulverized coal 5 that then ignites creating a flame envelope 10 we provide three methods which limit the mixing of the gaseous fuel within proximity of the condensed phase burner and its dedicated air supply these different methods are necessary in order to allow retrofit to existing or new burner and igniter equipment having different designs with different co firing gas usage applications referring to fig2 a swirl type burner has been modified so that the co fire gas can be injected with a velocity significantly higher than the velocity of the coal combustion air and with a spatial direction so as to minimize mixing with the design burner air supply the opening 4 in in the burner wall 2 and the injector tube 6 through which a stream of pulverized coal 5 is injected into the furnace are the same as in a conventional swirl type burner shown in fig1 swirling combustion air 7 is injected through the opening 4 around the injector tube 6 however the igniter tube 18 that is positioned within the opening 4 has a tube within a tube configuration in which the centerline of both tubes is on a common axis gas and typically injector air is injected through the inner tube 15 while co fire gas 13 is injected through the region between the inner tube 15 and the outer tube 17 the co fire gas is injected around the standard igniter but with velocity which is.