Low-nitrogen condensing atmospheric pressure hot water boiler
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- Description
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The CWNS-85/65-Y.Q series fully automatic oil (gas) atmospheric water boiler adopts a shell-type three-pass, fully wet-back structure. Fuel burns under slightly 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 heating.
Utilizing the design concept of a three-pass structure, a three-pass atmospheric water boiler with a larger capacity is designed. The boiler's greatest feature: it adopts a fully wet-back structure and an eccentric furnace, which is conducive to expanding the sufficient radiation heating surface. The convective heating surface is composed of the second and third pass tube bundles. The second and third pass transition smoke chambers form the front smoke box, and the flue gas temperature at this point is below 500℃. Therefore, the front smoke box structure uses lightweight refractory insulation materials. The flue gas outlet of the rear smoke box is arranged in the direction of the longitudinal axis of the cylinder, which not only shortens the boiler length but also avoids the chimney being placed in the direction perpendicular to the longitudinal axis of the cylinder, preventing condensation corrosion of the boiler body during boiler start-up and shutdown.
The design of this boiler mainly considers convenient boiler maintenance. The mixing device installed in the boiler return water inlet allows the return water to first flush the smoke tube bundle before contacting the furnace, increasing the water temperature of the return water at the furnace. This avoids the phenomenon of local subcooled boiling.
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