Lime kilns have been the classic point for the destruction of strong NCG and stripper off gas. Dilute NCG of limited volume may also be burned in the kiln. The lime kiln requires adequate excess oxygen to assure complete combustion of the gases. Also sulfur dioxide emissions may be an issue at kilns with precipitators rather than wet scrubbers.

Care is taken in the method of injection of the strong gas and SOG to insure that it does not influence the main burner flame. The gases may be injected through a separate nozzle with multiple ports or as a part of the main burner. The dilute gases may be mixed with the main combustion air or through a separate nozzle if the volume is low enough. A. H. Lundberg Associates, Inc. supplies the independent burner nozzles to match the existing burner design and penetration. These nozzles are usually air cooled.

The permissives to burn the gases in the lime kiln are tied into the main burner management system. In order for the gases to be burned the burner fire eye must be able to sense the flame. If the NCG is not injected into the kiln properly it may mask the flame scanners ability to see the flame.

Caution must be exercised in the design of the NCG piping entering the kiln to insure there are no low points for condensate build up. This is of particular importance when the mill has the ability to burn the gases in more than one location. If the piping has a low point, turpentine may collect causing a large volume of fuel to enter the kiln upon switching incineration points, ultimately interfering with the kiln operation.

A. H. Lundberg Associates, Inc. has developed a "bumpless" transfer technology. This allows switching from one combustion point to another without venting provided that the permissives are satisfied. This transfer may occur by manual convenience or automatically based upon an upset condition at the point of current combustion.