The current invention discloses a method and apparatus for production of hot water or steam in a 4-pass firetube boiler. A waste heat stream is passed through the first and second passes of the boiler, and then routed into a furnace tube (which is the third pass of the boiler) to help suppress the flame temperature and NOx emissions from the burner. The flue gas from the third pass is then passed through the fourth pass of the boiler to transfer the heat energy to the water in the boiler.
David Bohn (1962-1966), Anita Jester (1957-1961), Gary Wantz (1963-1967), Valerie Little (1984-1988), Shirley Jordan (1952-1956), Judy Clingan (1966-1970)
David Bohn (1969-1973), Travis Lawhon (1996-2000), June Ivy (2001-2005), Tina Hudson (1994-1998), Greg Witonski (1986-1990), Daniel Grayson (2002-2006)