Effects of Furnace Flue Gas Pressure on the Characteristics Relating to the Heat Transfer of a Oil-Fired Supercharged Boiler

Abstract

The theoretical approach was employed to a oil-fired supercharged boiler in order to derive universal significant conclusions, thereby guidance can be offered for performance design and operation activity. the correlative knowledge concerning the theory and property of fluid molecule, engineering thermodynamics, heat transfer, boiler principle and higher mathematics were therefore primary employed to agure the effects of flue gas pressure on the needful parameters and computing formulae of heat transfer, together with the regular patterns of heat transfer, the principle for the enhancement and its effects on the structure and the flue gas resistance of a oil-fired supercharged boiler. By the arguments, the following conclusions can be derived: Besides the consideration of the convection heat transfer in furnace, the needful parameters and computing formulae for the heat transfer of a oil-fired supercharged boiler is uniform with that of an atmospheric boiler. the regular patterns with the increase of flue gas pressure for the total furnace heat transfer, the interrelationships between furnace radiation heat transfer and furnace convection heat transfer, and between the total furnace heat transfer respectively and the heat transfer in the evaporation process of feedwater and the convection heat transfer behind furnace, together with the temperature variations of furnace exit and the exhaust gas of a oil-fired supercharged boiler. The adoption of a compressor can help the enhancement of heat transfer, the decreases of the volume and the flue gas resistance of a oil-fired supercharged boiler, the convection heat transfer in the evaporation process of feed-water to recruit the shortage of the total furnace heat transfer with the increase of flue gas pressure.