EPA Method 4, developed by the American Environmental Protection Agency (EPA), defines a method for determining the moisture content in flue gas. However, this method does not include all the requirements for flue performance, eg equipment and consumables and procedures, eg sampling procedure. This method is valid for determining the moisture content of flue gas and adherence to the requirements of this method improves the quality of data from air pollutant sampling methods.
During the test, a gas sample is taken from the chimney at a constant velocity, moisture is removed from the sample stream and determined gravimetrically. The method described here includes two possible procedures: a reference method and an approximation method.
The reference method is important for the correct determination of the moisture content required to calculate the emission data. The approximation method provides percent moisture estimates to help adjust isokinetic sampling rates prior to a pollutant emission measurement study. There are other alternative methods for determining the moisture content. For example, drying tubes, wet-chamber dry-chamber techniques, condensation techniques, stoichiometric calculations and previous experience.
The reference method is essentially carried out simultaneously with a pollutant emission measurement study. Also, percentage isokinetics, pollutant emission rate and similar calculations are based on the results of the reference method or its equivalent.
Moisture in flue gas emissions from coal-fired power plants and the environmental impact of high-moisture flue gas are significant concerns. Flue gas moisture primarily results from the release of hydrogen during coal combustion and water carried by the flue gas through wet flue gas desulfurization systems. High-moisture flue gas emissions increase the overall humidity in the lower atmosphere, affecting the local climate. High-moisture flue gas emissions also damage the power plant, leading to increased water consumption and a decrease in latent heat of vaporization. High-moisture flue gas and other acidic gases such as sulfur trioxide cause flue corrosion, shortening equipment lifespan.
Our company, among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, also provides moisture determination services in flue gas with its trained and expert staff and advanced technological equipment.
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