| 摘要 |
A waste heat boiler (10, 38) of the type which is particularly suited for use in marine applications and which incorporates a feed mixing nozzle (50) that is operative for purposes of effecting, by utilizing steam taken from the steam generating bank (20, 48), a preheating of the feedwater that is fed to the steam drum (14, 42). In addition to the aforesaid feed mixing nozzle (50), the subject waste heat boiler (10, 38) includes a feedwater control valve (12, 40), a steam drum (14, 42), a circulation pump (18, 46), a steam generating bank (20, 48) and a centrifugal water separator (16, 44). The feedwater control valve (12, 40) is employed to modulate the flow rate of the incoming feedwater in order to maintain the desired level of water in the steam drum (14, 42). In turn the latter steam drum (14, 42) is intended to function in the manner of a reservoir for the circulating water that through the operation of the circulating pump (18, 46) is supplied to the steam generating bank (20, 48). The circulating water which is supplied to the steam generating bank (20, 48) is heated therein to saturation temperature, and steam is generated thus. A water-steam mixture is returned from the steam generating bank (20, 48) to the steam drum (14, 42) and is directed into the centrifugal water separator (16, 44) that is suitably located within the steam drum (14, 42). It is in the centrifugal water separator (16, 44) that the separation of the water-steam mixture is effected such that water is returned to the lower portion of the steam drum (14, 42) and the steam is supplied to the upper portion of the steam drum (14, 42). The preheating of the feedwater is accomplished by directing the incoming feedwater through an internal feed pipe (66) to the mixing nozzle (50), the latter being positioned in the line (60) through which the water-steam mixture is returned to the steam drum (14, 42).
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