What happens if the composition of fuel changes during boiler operation?

When there is a change in the composition of fuel during boiler operation, it often leads to the creation of excessive soot deposits. This occurs because different fuel compositions burn at varying efficiencies and combustion characteristics. If a fuel with higher carbon content or impurities is introduced, it may not combust completely, leading to unburned carbon that accumulates as soot. This soot can build up on heat transfer surfaces, reducing the overall thermal efficiency of the boiler and potentially causing operational issues such as overheating and blockages. Managing fuel quality is crucial for maintaining efficient and safe boiler operation.