The air leakage rate of a flapper door is the rate at which, in the closed state, the flapper door fails to seal completely, allowing air or gas to pass through. This metric is critical for evaluating the sealing performance of baffle doors, especially in industrial applications that require a high degree of sealing, such as flue gas desulfurization systems, denitrification systems, or dust collection systems in the power industry.
Here is some information about the rate of air leakage for flapper doors:
Standard leakage rate：
In industry standards, high-quality flapper doors should have a very low air leakage rate in closed state, and the air leakage rate after flapper doors are closed is normally less than 0.1%.
This means that when the flapper door is closed, only a very small amount of air or gas can leak through the door crack or poorly sealed areas.
Measurement method：
The air leakage rate is usually calculated by establishing a pressure differential on both sides of the baffle door and measuring the amount of air flow through the door.
The calculation formula is: air leakage rate = (air leakage/inlet air volume) x 100%.
Influencing factors：
The properties of the sealing material, such as the quality of the sealing strip or sealing gasket.
The design of the baffle door, including the fit between the door leaf and the frame.
The accuracy of the actuator, such as whether the electric or pneumatic device is able to accurately position the flapper door in a fully closed position.
Wear or deformation during long-term use can also affect sealing.
Improvement measures：
Improve the sealing system, such as using more efficient sealing materials or improving the seal design.
Regular maintenance and inspection, replacement of worn seal components.
Adjust or upgrade the actuator to ensure that the flapper door closes tightly.
Materiality：
In flue gas treatment systems, low air leakage rates are essential to maintain the efficiency of the system and reduce energy waste.
High air leakage rates can lead to additional energy consumption, increase operating costs, and may affect the performance of the emissions control system.
For flue baffle doors in the power industry, especially those used in desulfurization, denitrification or dust removal systems, low air leakage rate is very important because it is directly related to the overall efficiency of the system and the achievement of environmental protection goals. Therefore, it is crucial to select and maintain a flapper door with excellent sealing properties.