Arkansas Boiler Operator Practice Exam

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What does induced draft in a boiler refer to?

A fan on the inlet side of the boiler pushing air in
A fan or fans on the exhaust side pulling air through the boiler
A natural air flow mechanism
A device that assists in fuel combustion

The correct answer is: A fan or fans on the exhaust side pulling air through the boiler

Induced draft in a boiler refers specifically to the use of a fan or fans located on the exhaust side of the boiler that pull air through the system. This method helps to create a negative pressure within the combustion chamber, enhancing airflow and improving the efficiency of combustion. By drawing air through the boiler, it ensures that sufficient oxygen is available for burning fuel effectively, which leads to better heat production and more complete combustion. The design of induced draft systems allows for control over the combustion process, facilitating adjustments to airflow based on operational needs, thus optimizing performance and reducing emissions. Induced draft is typically preferred over forced draft systems in many applications because of its ability to handle variations in flue gas temperatures and maintain stable operation under different load conditions.