What produces mechanical draft in a boiler system?

Mechanical draft in a boiler system refers to the process of moving air or flue gases through the system using mechanical means, rather than relying on natural forces. Power driven fans are specifically designed to create the necessary airflow, facilitating the efficient combustion of fuel and removal of combustion gases. These fans can either push air into the boiler (forced draft) or pull flue gases out of the system (induced draft), or they can serve both functions.

This method of draft production allows for greater control over the combustion process, ensuring that the boiler operates at optimal efficiency and safety. It also compensates for changes in operational conditions or environmental factors, making it a more reliable option compared to natural drafts, which are heavily influenced by external weather conditions.

Natural wind, gravity, and pneumatic pumps do not provide the same level of control or efficiency as power driven fans. Natural wind is unpredictable and can vary significantly. Gravity relies on buoyancy and temperature differences, which may not be sufficient for effective draft in all boiler designs. Pneumatic pumps are designed to move fluids rather than gases, making them unsuitable for creating draft in a boiler system.