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Home Service FAQs FAQ of coal-fired boilers What is the effect of volatile matter on boiler combustion?

What is the effect of volatile matter on boiler combustion?

11 Aug 2023

Volatile matter in fuel, particularly in solid fuels like coal or biomass, plays a crucial role in the combustion process within boilers. Understanding the effect of volatile matter can help optimize the boiler operation for better efficiency and emissions. Here are the impacts of volatile matter on boiler combustion:

Ignition and Combustion Stability: High volatile matter content aids in the easy ignition of the fuel. As volatile components release and ignite rapidly when the fuel is heated, they help establish and stabilize the combustion process early on. This makes the combustion process more stable, especially at the start.

Combustion Rate: Fuels with a higher proportion of volatile matter typically burn faster than those with lower volatility. This can affect the residence time of fuel particles in the combustion chamber, potentially requiring adjustments in boiler operation.

Emission Levels: The rapid release and combustion of volatile compounds can lead to incomplete combustion if not managed properly. Incomplete combustion can produce harmful emissions such as carbon monoxide (CO), unburned hydrocarbons, and other organic compounds. However, with proper air-to-fuel ratios and mixing, cleaner combustion can be achieved.

Boiler Efficiency: Efficient combustion is tied to the ability of the boiler to fully utilize the energy potential of the fuel. High volatile matter can be beneficial in this regard, as it can aid in complete combustion. But it's crucial to ensure the balance, as excessively high volatile content without proper combustion controls can lead to energy losses.

Ash and Slagging Issues: The non-volatile components of the fuel, mainly minerals and other inert matter, become ash after combustion. If the fuel has a high ash content relative to its volatile matter, there can be issues with slagging and fouling inside the boiler. This is because the rapid combustion of the volatile matter can lead to elevated temperatures that cause ash particles to become sticky and adhere to boiler surfaces.

Flexibility in Boiler Operation: Fuels with higher volatile content can often be combusted in systems with shorter residence times or lower temperatures, providing some flexibility in boiler design and operation.

In conclusion, while the volatile matter in fuel significantly influences boiler combustion, it's just one of the many factors that need to be considered. Proper boiler design, operation, and maintenance practices are essential to harness the energy from fuels with varying volatile matter content efficiently and cleanly.

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