What are the three types of draft used in power plants?

The three types of draft used in power plants are natural, forced, and induced.

Natural draft occurs due to the buoyancy of hot air, which rises and creates a pressure difference that draws air through the combustion system. This method relies on the temperature difference between the hot gases and the outside air to create airflow, making it energy-efficient and simple to implement.

Forced draft involves the use of fans or blowers to push air into the combustion chamber, enhancing the combustion process. This method allows for greater control over the flow of air, ensuring optimal combustion conditions, which can improve efficiency and reduce emissions.

Induced draft, conversely, utilizes fans to pull flue gases out of the combustion chamber and through the system. This type of draft helps ensure that combustion products are effectively removed, which can improve safe operation and maintain efficiency by maintaining the necessary pressure conditions within the system.

Each type of draft plays a crucial role in optimizing combustion efficiency and maintaining safe operational conditions in power plants.