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Gas measurements dilute - non-condensable gases, DNCG

What is normally called dilute non-condensable gases, DNCG contains a mixture of different sulfur-containing substances; hydrogen sulfide, methyl mercaptan, DMS and DMDS.

The need to be able to collect and destroy so-called particulate matter (DNCG) has increased as the EU tightened requirements on industry to use best available technology to reduce sulfur emissions to air.

The concept for the gas measurements is based on a portable gas chromatograph being set up on site so that the weak gases can be quickly analyzed from different test points. According to EU Directive 2010/75 / EU, the requirements in the BAT conclusions must be met by 30 September 2018 and all mills must report how the requirements are complied with or how they plan to comply with them. The concept is based on a portable gas chromatograph being set up on site, so that the samples can be quickly taken out and analyzed.

The way for the pulp mills to solve the problem with low gases is to reduce the various emissions and collect them to a point, for example the recovery boiler, for combustion. But in order to be able to dimension a plant for this, the size of the flows and their composition must be known.

RISE has developed methods for DNCG mapping - measures flows and to analyze the sulfur content (DNCG) in the pulp mills' low gases.

DNCG - Total Reduced Sulfur Amount: The sum of the following reduced odorous sulfur compounds formed during pulp production: hydrogen sulphide, methyl mercaptan, dimethyl sulphide and dimethyl disulphide, expressed as sulfur. Diluted non-condensable odorous gases: Gases with DNCG content that are not strong odorous gases (eg gases from tanks, washing filters, chip pockets, mesa filters or dryers).

RISE can also do analyzes of gases in vents from tanks and from landfill gas - analyzes the content of methane and other gases in vents from tanks and collection points from landfills.

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Jörg Brücher

Forsknings- och utvecklingsingenjör

+46 10 516 67 14

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