A burner for use in furnaces such as the type employed in steam cracking. In one embodiment, only parasitic capacitance is used for the integrating function. Light from a light source is reflected by one or more of the array of micro-mirrors, to project the image onto the surface. A trigger spaced from the release member is operatively connected to the housing for actuating the ignitor for the generation of a spark igniting the fuel present at the nozzle. ; and routing the opened microfiber slurry to a primary solid liquid separation zone to produce the microfiber product stream and a first mother liquor stream; wherein the first mother liquor stream comprises water and the water dispersible sulfopolyester.