What type of draft system is typically used to overcome resistance in power boilers equipped with an economizer?

In power boilers equipped with an economizer, a forced draft system is typically used to overcome the resistance created by the economizer. The economizer, designed to recover waste heat from the flue gases, adds an element of pressure loss to the air supply system. Since this pressure loss can potentially reduce the efficiency of combustion, a forced draft system is employed to ensure that sufficient air is supplied to maintain optimal combustion conditions.

A forced draft system uses fans to actively push air into the combustion chamber, allowing it to overcome any resistance presented by the economizer. This system effectively maintains the necessary air flow rates despite the additional resistance, ensuring efficient operation of the boiler.

While an induced draft system does assist in managing flue gas flow, its primary role is to create a negative pressure within the combustion area, which may not be as effective in overcoming resistance posed by the economizer. A balanced draft system combines both forced and induced elements, but in the specific context of power boilers with economizers, a forced draft approach is the preferred choice due to its ability to combat the pressure losses effectively. Natural draft systems rely on buoyancy and are not typically suited for scenarios where precise control of airflow and combustion efficiency is critical, such as in power boilers with econom