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.

Dilute non-condensable gases, DNGC

RISE has methods for measuring flow rates and analyzing the sulfur content (TRS) in the pulp mills dilute non-condensable gases, DNGC. The concept is based on the fact that a portable gas chromatograph is set up in place, so that the weak gases from different test points can be quickly analyzed.

What is usually called dilute non-condensable gases, DNCG, or TRS gases contains a mixture of different sulfur-containing substances such as hydrogen sulphide, methylmercaptan, DMS and DMDS. The method for pulp mills to solve the problem with odorous gases to pull the different emissions together and collect them to a point, such as the soda 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 and mapped.

According to EU directive 2010/75/EU, the requirements of the BAT conclusions must be met by 30 September 2018 and all pulp mills must show how the requirements are followed or how they plan to follow them.

Since there is a wider deadline when new emission conditions apply to sulfur, we see here a need that we solve for our customers. Although the use has environmental permits that go beyond the time limit set by the EU, the sulfur condition will be renegotiated and, in many ways, the need may be to have the flows measured and analyzed.

Analyzes of gases in ventes from tanks and from landfill gas

RISE has methods for analyzing the content of methane and other gases in ventes from landfills. The concept is based on the setting up of a portable gas chromatograph in place, so that the samples can be quickly taken and analyzed.

Landfill gas is a mixture of gases produced when organic waste decomposes in landfills or rubbish dumps. Landfill gases mainly consist of methane (CH4) and carbon dioxide (CO2), but can also contain small amounts of other gases such as hydrogen cyanide (HCN), ammonia (NH3), and hydrogen sulfide (H2S). Methane is particularly concerning as it is a potent greenhouse gas with a much higher global warming potential than carbon dioxide.

Landfill gases can pose a significant environmental and health risk if released into the atmosphere without control. To mitigate this risk, landfill gases are typically collected through gas collection systems and either burned for energy production or converted into other useful products. This process, known as landfill gas collection and energy recovery (LFGTE), helps reduce greenhouse gas emissions while also generating renewable energy.