what is flue gas in boiler
What is flue gas in the boiler?
Flue gas exit temperature, also known as the flue gas stack temperature, is the temperature of the flue gas as it is expelled from a chimney or flue. This temperature is an important factor in the design and operation of boilers, furnaces, and other industrial processes that involve the burning of fossil fuels, such as coal, natural gas, or oil. In general, the flue gas exit temperature will depend on the type of fuel being burned, the efficiency of the combustion process, and the design of the system. Higher flue gas exit temperatures can indicate that the combustion process is inefficient or that there is a problem with the system.
In a boiler, the flue gas is produced when the fuel is combusted in the furnace. The flue gas is then passed through a series of tubes or pipes called the convection section, where it comes into contact with water or steam. This transfer of heat from the flue gas to the water or steam generates steam or hot water, which can be used for various purposes, such as heating buildings or generating electricity. The composition of flue gas varies depending on the type of fuel being burned and the efficiency of the boiler. For example, natural gas produces relatively clean flue gas, with a low concentration of pollutants, while coal and oil produce more polluted flue gas. The flue gas may also contain trace amounts of other substances that are present in the fuel, such as mercury, lead, and other heavy metals. In some cases, the flue gas may be treated to remove pollutants before it is released into the atmosphere. This can be done using a variety of technologies, such as scrubbers, which use water or chemicals to remove pollutants from the gas, or catalytic converters, which use catalysts to break down pollutants into less harmful substances.