The fast boiler

Does water tube boiler need to be equipped with induced draft fan?

Time : 2021-03-30

Water tube boiler is double drum longitudinal arrangement, full membrane type water wall, D type furnace natural circulation, micro positive pressure combustion steam boiler, Φ900 / Φ700 on the lower drum is located on the left side of the boiler, between the upper and lower drum welded with Φ51 ×3 high-quality seamless steel tube convection tube bundle, the right side is composed of Φ159 on the upper and lower set box and Φ51 ×4 membrane wall composition of the combustion chamber.

Process: flue gas burner is fixed on the wall before and after burner jet fuel, (the first return) micro positive pressure inside the chamber of a stove or furnace combustion, after high temperature flue gas radiation heat, turn to the left of the 180 ° after furnace convection bank into the second return, before furnace to flows into the horizontal superheater, turn on the left side of the 180 ° entering the economizer in front of the furnace (return) to the third convection tube bundle, and then after economizer heat fully, finally is entered into the chimney flue discharge into the atmosphere.

The boiler with negative pressure combustion needs to be equipped with induced draft fan, while the boiler with positive pressure combustion does not need to be equipped with induced draft fan.Because the combustion and flue gas side heat transfer of the micro positive pressure combustion boiler are all carried out under positive pressure.Therefore, combustion and heat transfer can be enhanced, which is beneficial to improving boiler efficiency and reducing low temperature corrosion.In addition, the specific volume of flue gas can be reduced to reduce the volume of combustion chamber and flue, which is beneficial to the manufacture of large capacity boilers.The design of water tube boiler of our company follows reasonable circulation process, low back pressure, positive pressure combustion, improved thermal efficiency, no induced draft fan, small power consumption.

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