Flap doors are widely used in power plants and they are designed to control the flow of flue gas, air, or other media, especially in flue, air duct, and duct systems. The main applications of baffle doors in power plants include:
Flue Gas Control System：
Baffle doors are used in flue gas systems, such as inlet and outlet of absorption towers or on bypass flues, to control flue gas flow or completely cut off flue gas flow, which is crucial for flue gas desulfurization (FGD), denitrification (SCR) systems.
In the event of a downtime or emergency, the flapper door can be quickly closed, blocking off the flow of smoke and preventing harmful gases from leaking or spreading.
Air duct control system：
The baffle door is used to control the air duct of supply air, induction air or secondary air, regulate the amount of combustion air, and ensure the stability and efficiency of the boiler combustion process.
Medium interception：
In steam, air, or flue gas ducts, baffle doors act to intercept the flow of the medium, allowing the medium to circulate entirely in the pipeline or to be completely closed, thereby controlling the operating state of the system.
Isolation and maintenance：
When it is necessary to repair or replace some part of the piping system, the baffle door can act as an isolation device, ensuring that no media flows in or out of the service area, providing a safe working environment.
Pressure and temperature control：
The baffle door can withstand high pressures and temperatures in the system, maintaining tightness and preventing media leakage while protecting downstream equipment from high pressure or heat.
Emergency shutdown：
In the event of a fire, explosion, or other emergency, the flapper door closes quickly to prevent the spread of fire or harmful substances.
Flap doors are often designed with the special needs of power plant operation in mind, such as high temperatures, high pressures, corrosive media, and dust, among others. They are typically manufactured with wear-resistant, high-temperature resistant materials and are equipped with efficient sealing systems that ensure reliable operation in a variety of operating conditions. Flap doors can be manually operated or electric or pneumatic actuator driven to accommodate different control needs. In some cases, the flapper door may also have integrated remote monitoring and control functions to facilitate automated management of the power plant.