What does the term "stack gas" refer to in boiler operation?

The term "stack gas" specifically refers to the exhaust gases that are emitted as a byproduct of the combustion process within the boiler. When fuel is burned to generate heat in a boiler, it produces various gases, including carbon dioxide, water vapor, nitrogen oxides, and other possible pollutants, depending on the type of fuel used and the combustion efficiency. These gases are directed through a stack or chimney to be safely expelled into the atmosphere.

Understanding stack gas is crucial for boiler operation, as it impacts overall efficiency and environmental compliance. Proper management of stack gas can help reduce emissions, which is an important concern in many industries due to regulatory standards and the need for maintaining air quality. Monitoring stack gas composition is also vital for troubleshooting combustion issues and ensuring optimal boiler performance.