Monitoring Solutions for Pulp and Paper Applications

Unheated sample lines are more reliable and less expensive to run.  The Thermo Scientific Continuous Emissions Monitoring System for Total Reduced Sulfur employs a dry basis dilution system which means no heated sample line is necessary, ever.  Many competitive TRS systems use a wet dilution or a dry extractive technique which requires a heated umbilical line.  Heated lines are often more costly and results in more downtime.

The Thermo Scientific Continuous Emissions Monitoring System for Total Reduced Sulfur uses the same working principle of system is based on EPA Reference Method 16C.   As detailed on the US epa.gov website, Method 16C is a procedure for measuring total reduced sulfur (TRS) in stationary source emissions using a continuous instrumental analyzer. Quality assurance and quality control requirements are included to assure that data of known quality is collected. Documenting adherence to these specific requirements for equipment, supplies, sample collection and analysis, calculations, and data analysis is easier with the Thermo Scientific TRS CEMS. 

The Thermo Scientific Continuous Emissions Monitoring System for Total Reduced Sulfur delivers the cleanest sample to the analyzer as possible because the system measures oxygen with a dilution probe.  With other techniques, the sample is concentrated with pollutants and results in sludge and heavy contaminants being fed to the analyzer.  Measuring oxygen with a dilution probe ensures you are drawing a cleaner sample ensures longer lifetime and more time between failures.  Additionally, the dilution system ensures emissions compliance regulations.

The sulfur dioxide (SO₂₎ scrubbing technique that is used by the Thermo Scientific Continuous Emissions Monitoring System for Total Reduced Sulfur is designed specifically for lime kilns and recovery boilers that burn black liquor fuels. Burning black liquor fuels emits mercaptans and sulfur compounds.  The Thermo Scientific TRS CEMS uses an SO₂ scrubbing technique, which is favorable over the differential subtraction technique.  The SO₂ scrubbing technique allows for the measurement of low TRS levels (up to 10,000 ppm of SO₂) even in high SO₂ conditions unlike the differential subtraction technique employed by other systems used when the ratio of TRS to SO₂ is near unity.

Eliminate bias and error by calibrating with a gas that best represents the gas being measured. For example, it is best to calibrate with hydrogen sulfide (H2S) because from a chemical reaction standpoint, it is more efficient to convert H₂S to sulfur dioxide (SO₂) because the ratio between the molecules is 1:1.