Bypass baffle door

1、 Product Overview:
The bypass baffle door is produced and manufactured by Lianyungang Huaneng Electric Power Auxiliary Equipment Co., Ltd. with advanced foreign technology. The desulfurization baffle door is used on the inlet and outlet of the absorption tower or the bypass flue of the flue gas desulfurization system, or in the flue gas denitrification and dust removal system. The air door usually adopts a louver type double-layer baffle structure. When closed, sealed air is introduced between the double-layer baffles to isolate and shut off the flue gas.
This product has flexible opening and closing rotation, reasonable driving torque, tight and reliable closing, and long service life. It is an important supporting equipment in the desulfurization system of thermal power plants.
The bypass baffle door produced by Huaneng Company adopts optimized structural design based on the introduction of advanced foreign technology. The equipment is reliable in operation, flexible in opening and closing, tight in closing, and has high strength, good rigidity, and durability, greatly improving the desulfurization efficiency of the system and meeting the environmental protection requirements for flue gas emissions. Huaneng Company is a professional manufacturer of power air door equipment for thermal power plants, which has been widely used in major thermal power plants across the country.

2、 Introduction to structural characteristics:
1. The design structure of the bypass baffle door is reasonable, the blade rigidity is good, and the operation is stable and reliable. The sealing type of the bypass baffle door blade is elastic sealing and gas sealing. A sealed air inlet valve is designed and installed on the shell, which is interlocked with the baffle door for control. After sealing air with a certain pressure and flow rate is introduced between the blades, it can effectively isolate the smoke flow before and after the blades, thereby achieving a 100% sealing efficiency of the baffle door.
2. The opening and closing time of the bypass baffle door is ≤ 60 seconds (can be selected according to user requirements).
3. The outer design of the bypass baffle door shell is equipped with a linkage mechanism. After optimization design, the opening and closing of each blade of the baffle is in a streamlined manner like a louver, and the opening or closing is synchronized to achieve integrated operation.
4. The bypass baffle door adopts a single axis driven single axis double louver baffle structure. A sealed chamber is designed in the middle of the double-layer blades to introduce sealed air, which is at least 500Pa higher than the flue gas pressure and flows into the baffle to form a sealed air isolation layer between the double-layer baffles, blocking the passage of flue gas flow.
5. The bypass baffle door should rotate flexibly without any jamming under guaranteed working conditions. Adopting a frame type (high temperature resistant) self-aligning bearing structure with a seat, the driving torque of the baffle is smaller, and the rotation is more flexible and lightweight. The baffle blades are designed with thermal expansion compensation gaps, ensuring safe and reliable operation under hot conditions.
6. The bypass baffle door baffle is designed with a flow line structure, which can fully reduce the resistance to the airflow. The outer frame of the door is made of steel, and the blade design adopts a wing shaped (or flat plate shaped) structure to ensure reasonable and smooth airflow distribution. The blade body is made of ordinary carbon steel or alloy steel, and the blade overlap (or seal with the shell) is made of elastic stainless steel or nickel based alloy steel sealing plates, which have strength and stiffness that meet the working conditions and are firmly attached to the extension shaft. The shaft handle device of each air door blade is supported by two externally installed, automatically leveled, and maintenance free Huaneng electric auxiliary machines with flange bearings, effectively avoiding the increase of driving torque caused by the lack of concentricity of the front and rear shafts of the baffle or the occurrence of jamming during blade opening and closing after long-term operation.
7. The connection method between the bypass baffle door and the flue is as follows: the flue is inserted into the baffle door and sealed and welded inside the reverse flange. Before leaving the factory, the front and rear flanges are bolted and connected, and on-site sealing and welding are carried out. After the on-site hoisting of the baffle door with lining due to anti-corrosion requirements, the front and back flanges must be sealed and welded, and the sealing welding of the lining must be ensured. The on-site anti-corrosion layer must cover the lining inside the shell.
8. The driving method for bypass baffle doors is generally electric or pneumatic. Convenient and reliable control. It can input and output switch signals (or input and output analog signals) to control the blade opening according to the system operating mechanism requirements and reflect the blade opening status in real time. It can be operated remotely or controlled by programs, making it convenient for DCS to control automation.
9. The electric (pneumatic) actuator of the bypass baffle door adopts intelligent integrated control, with torque protection and limit switch, which can be controlled locally or remotely. It also has manual and electric (pneumatic) switching functions for installation, commissioning, and maintenance. After installation and debugging, it leaves the factory. The limit switch of the electric (pneumatic) device has been adjusted and set in place before leaving the factory. Users only need to turn on the power (or gas source) and connect it to the wiring terminal to make the baffle door work normally.
10. The sealing fan and electric heater of the sealing air system can be provided as a complete set after our selection.    

3、 Technical parameters:
1. Model representation method:
Bypass baffle door FGD (model) - W (width) × H (height)
2. Power and gas sources:
Bypass barrier door: AC three-phase three wire~380V/50Hz or as determined by the user
Bypass baffle door: AC power supply~220V/50Hz (solenoid valve)

Compressed air source 0.4MPa-0.8MPa

3. Installation positions: horizontal air duct, vertical air duct, inclined air duct.
4. Circulating medium: smoke or other gases.
5. Design pressure bearing capacity: ± 8000Pa
6. Design temperature resistance: ≤ 350 ℃
7. Leakage rate: ≤ 0%

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