What is the approximate dew point for sulphur gases in flue gas?

The dew point for sulfur gases in flue gas is approximately 150 degrees Celsius. This temperature is significant because it corresponds to the point at which sulfur compounds, including sulfur dioxide and sulfur trioxide, begin to condense from flue gases as the temperature decreases.

Understanding the dew point is essential in the context of combustion processes and flue gas treatment, particularly in power generation and industrial applications. When the flue gas cools to the dew point, corrosion can start due to the condensation of these acidic sulfur compounds, which can damage equipment, such as boilers and heat exchangers. Therefore, maintaining flue gas temperatures above the dew point is crucial in preventing equipment damage and ensuring efficient operation.

Selecting the correct value for the dew point is based on empirical data and operational experiences in different combustion settings. The options provided reflect a range of temperatures, where 150 degrees Celsius is utilized as the standard reference point for the dew point related to sulfur gases in typical flue gas compositions.