Evaluation Disposal of DNCG and CNCG in Recovery/Power Boilers


[info_box]Because of Cluster Rule legislation, many kraft mills in North America collect and incinerate high volume low concentration (HVLC) non-condensable gases (NCG).[/info_box]

Types of Non-Condensable Gases:

  • Concentrated Non-Condensable Gases (CNCG)
  • Dilute Non-Condensable Gases (DNCG)

These dilute non-condensable gases (also called DNCG) are collected from various sources such as washers, deckers, chip bins, liquor tanks, sewers, and many others. They contain small amounts of TRS and volatile organics, with moist air making up over 95% of the DNCG. As a less expensive alternative to purchasing a dedicated incinerator, this stream can be conveniently combined with balance of combustion air in a power boiler (at the level of overfire air) or recovery boiler (secondary/tertiary air levels).

More and more mills are disposing of concentrated NCG (CNCG) in boilers as well.

Mills are faced with making informed decisions where and how to inject the NCG stream safely in an existing boiler and in a manner that will not detrimentally affect normal boiler operation.

Scope of Services

  • Help select boiler(s) best suited for disposal of DNCG and/or CNCG stream (i.e., specific power or recovery boiler).
  • Evaluate impact of NCG injection on boiler efficiency, normal fuel burning capacity, air emissions, corrosion factors, safety, and potential odor problems.
  • Determine best location and method of injection of the non-condensable gases (NCG) stream into the furnace in order to assure rapid and complete thermal oxidation.
  • Define NCG injection conditions consistent with BLRBAC Recommended Good Practices.
  • Define potential secondary (pay-back) benefits of HVLC NCG injection (i.e. combustion air delivery upgrade).
  • Develop budgetary estimate or Class 10 cost to design, supply, and install boiler modifications for the injection of the non-condensable gases (NCG) stream.

Download the PDF on Evaluation Disposal of non-condensable gases (DNCG and CNCG) in Recovery/Power Boilers


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Jansen Combustion and Boiler Technologies, Inc.
11335 NE 122nd Way, Suite 275
Kirkland, WA 98034
Phone: 425.825.0500
Fax: 425.825.1131
General Information: jansen@jansenboiler.com