CNCG Systems

Non-condensable gases, or NCGs, are a by-product of the kraft pulping process. NCGs are toxic, foul-smelling and potentially explosive. In the distant past these gases were largely discharged directly to the atmosphere. This is no longer allowed. The purpose of an NCG system is to collect, condition and safely deliver these gases to a location within the mill where they are disposed of by incineration. This module will focus primarily on the CNCG type collection system.

•State the purpose of an NCG system •Describe the makeup of a typical concentrated non- condensable gas stream •Identify and describe the typical sources of NCGs •Differentiate between the two methods used to safely convey NCGs •Identify and describe the major equipment and components of a CNCG system •List the conditions needed for incineration of NCGs •List the possible NCG incineration locations within a mill •Identify and describe safety hazards and safety design features of a CNCG system