Cleaver-Brooks Industrial Boilers

Industrial watertube boilers typically produce steam or hot water for industrial process applications, and are used less frequently for heating applications. The watertube design is one in which the tubes contain steam and/or water and the products of combustion pass around the tubes. The industrial watertube design is noted for its fast steaming capacity. Our watertube boilers are fitted with our own multi-fuel fired burners which have been highly engineered and mated with the furnace to form a cohesive package delivering the highest fuel to steam efficiency and lowest emissions possible.

The key for achieving this is in the development of a boiler/burner package wherein the burner is a powerful mixer ensuring that the fuel is evenly mixed with the air so that it is completely burned within a limited flame volume. The lower the excess air required for complete combustion in a given volume, the more efficient the burner is in combusting all the fuel. The mixing power required to obtain the desired mixing rate comes from a summation of the combustion air flow pressure drop and the fuel flow pressure drop. These air and fuel pressure drops at a given volumetric rate provide the potential mixing power for a burner to accomplish its task. The flame volumetric heat generation of any burner is a function of this quantity; the larger it is, the smaller the resulting flame will be.

The second function, a burner must be able to ignite easily to generate a flame which most importantly, fits the furnace geometry. As for the stabilization of the flame, it is generally performed without much difficulty by a bluff effect and/or a critical swirl effect. Flame shape can be described by its length to diameter ratio, determined by the aerodynamics of the air and fuel injection pattern. The swirl, defined as the ratio of tangential momentum to axial momentum fluxes, summed over all the injected fluid streams, is the key controlling parameter for flame shaping. It is imperative that the burner generated flame is compatible with the furnace constraints. This is most critical in water cooled furnaces such as the D series boiler. If flame impingement occurs on relatively cool furnace wall tubes, carbon monoxide and other by-products of incomplete combustion will be produced at the point of impingement and severe boiler vibrations occur as a result due to the brutal re-ignition of these by-products.

The myth that you can hang any burner on a boiler and expect it to function efficiently, dependably, and with environmental friendliness is a misnomer which must be dispelled regardless of manufacturer. The boiler/burner package is a highly engineered power generator and for maximum performance it must adhere to basic combustion engineering and thermodynamic principles.
 

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INDUSTRIAL WATERTUBE BOILER