The Characteristics of WNS Gas Boiler Smoke Pipe and Welding Problems
The Characteristics of WNS Gas Boiler Smoke Pipe and Welding Problems
The smoke pipe is the heating surface where the smoke washes out inside the gate. WNS gas boilers adopt the internationally popular shell type three return, fully wet back structure, and large volume combustion chamber design, making combustion more complete. The fuel is burned under slightly positive pressure inside the furnace, and the high-temperature flue gas enters the first flue bundle through a 180 ° turning point in the combustion chamber along the furnace, and then enters the second bundle through a compressed front smoke box. After convective heat exchange, it is discharged into the atmosphere. In a three loop boiler, threaded smoke tubes are used for the second loop and smooth tubes are used for the third loop to improve heat transfer efficiency and maintain appropriate flue gas resistance. The threaded smoke pipe structure is conducive to the disturbance of smoke, increases the heating area, and has good heat transfer performance.
In addition, the welding process between the single smoke tube and the tube plate is very unique: adopting an advanced process of pre expansion, full welding, and then expansion joint, which not only prevents corrosion between the tubes but also enhances the welding strength; By using threaded smoke pipes with high heat transfer coefficients, the convective heat transfer effect is enhanced, the exhaust gas temperature is reduced, and the thermal efficiency of the boiler is improved.