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.
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Learning Objectives
• 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
Specs
| Course Level | Intermediate |
| Languages | English, Portuguese |
| Compatibility | Audio, Video |
| Based on: | Industry Standards and Best Practices |
Key Questions
What is the upper explosive limit of a flammable gas and air mixture?
It is the gas to air ratio above which the mixture will not burn.
What are NCGs?
NCGs are Non-Condensable gases. They are compounds which have boiling points above the temperature of most mill water cooling systems.
What is flame speed?
Flame speed is the rate at which a front will propagate through a flammable mixture.
How are steam ejectors used in an NCG system?
Steam ejectors pull NCGs through the system and discharge them to an incineration point.
How do flame arrestors stop a flame?
Flame arrestors absorb heat and cool a flammable mixture to below it’s ignition temperature.
Sample Video Transcript
One of the greatest dangers involved with transportation of flammable gases like NCGs is that an ignition might occur. An ignition within the piping system can result in a flame front that accelerates rapidly and generates high pressures. Flame arrestors are usually installed in CNCG piping close to the sources of gas and near the incineration points. These prevent a flame front from entering or leaving the collection piping.
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