Low-nitrogen condensing pressurized hot water boiler
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The WNSXX-X/95/70-Q(Y) series fully automatic oil (gas) pressure hot water boiler adopts a shell-type three-pass, fully wet-back structure. Fuel burns under slight positive pressure in the furnace, and high-temperature flue gas flows backward from the furnace through the combustion chamber into the first tube bundle, then enters the second tube bundle through the front smoke box, and after convective heat exchange, is discharged into the atmosphere. It provides heat energy for heating, domestic water, and industrial process heating. Utilizing the design concept of a three-pass structure, a three-pass pressure hot water boiler with a relatively large capacity is designed.
The boiler's greatest features: the pressure-bearing components are symmetrically arranged with the boiler drum center. The boiler adopts a fully wet-back structure, with a relatively large furnace and an eccentric firebox structure, which helps to expand the radiation heating surface. The convective heating surface is composed of the second and third pass tube bundles. The front tube plate of the combustion chamber is connected to the furnace by butt welding, and the rear tube plate of the combustion chamber is connected to the rear tube plate of the boiler shell by tie rods. The second and third pass turning smoke chambers form the front smoke box, and the flue gas temperature at this outlet is below 500℃. Therefore, the front smoke box structure uses lightweight refractory insulation materials. The return water first flushes the front tube plate of the combustion chamber and the tube bundle, then contacts the furnace, increasing the return water temperature in contact with the furnace. This avoids the phenomenon of local subcooled boiling.
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