Measuring SO3 in emissions

METLAB offers both accredited measurements of SO3, as well as manufactures and sells all the equipment required for customers who want to start measuring SO3 themselves.

Controlled Condensation: The Key to Accurate SO3 Measurement

Controlled condensation for determining SO3 in air emissions involves the following steps:

• Cooling of Flue Gases: Flue gases are cooled to a temperature between the dew point of water and acid (about 60-90°C). This ensures effective condensation of SO3.
• Collection of Condensate: The condensed SO3 (in the form of sulfuric acid mist) is collected on the walls of the cooler and in a fine sintered glass filter.
• Analysis of Condensate: After sampling is completed, the collected sulfuric acid mist is analyzed to determine the amount of condensed sulfur trioxide.

This method is effective because it ensures that SO3 is not lost during sampling. By maintaining the flue gases within a specific temperature range, the risk of water vapor condensation is minimized, which in turn reduces the risk of interference from other gases that can affect the SO3 measurement.

Applications in Industry: This technique is particularly relevant for industries such as:

• Power plants and energy production, where the combustion of fossil fuels can lead to SO3 emissions.
• Metallurgical processes and steel production.
• Manufacturing of sulfuric acid and other chemical processes. These sectors face special challenges with SO3 emissions and require careful monitoring and control to comply with environmental legislation and protect the environment.

Do you need SO3 measurement or equipment to conduct your own measurements? Contact us today