Process and device for recovery of thermal energy in a steam generating system
AssigneeEngetra S.A.
InventorAndre J. Paquet
Life of this patent
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Abstract
In a steam generating system, steam condensate extracted from steam used to reheat boiler water in heaters (H1, . . . , H4) is revaporized in the recuperators-vaporizers (RV1, . . . , RV3) by heat exchange contact with the flue gas from boiler (B). The steam thus formed is recycled to contribute to the reheating of the water fed to the boiler.
Claims18
In a power generating system comprising (1) a water cycle in which steam expansion condensate from the expansion of steam in a turbine is recovered and heated, prior to recycling to a steam generator, with steam extracted from the steam expansion, and (2) a flue gas cycle in which flue gas from the steam generator is recycled to preheat the air used to support combustion in the steam generator, the process for recovering additional thermal energy from the flue gas cycle which comprises using the flue gas discharged from the preheater to heat the steam expansion condensate in the water cycle and extract heat from the flue gas by passing it in heat exchange with the steam heater condensate resulting from the heating of the steam expansion condensate with expansion steam, the resultant stream being recycled to said heaters to heat said steam expansion condensate.
In a power generating system comprising a steam generator, means for preheating combustion air with flue gas from said steam generator, a turbine for expanding said steam, a plurality of heaters in series for heating steam expansion condensate from said turbine with expanded steam from said turbine, and means for recycling heated steam expansion condensate to said steam generator, the improvement for extracting additional energy from said flue gas which comprises means for using said flue gas to generate steam from the steam heater condensates recovered from said heaters, and means for recycling said steam to said heaters to heat said steam expansion condensate.
In a power generating system comprising a water cycle in which steam expansion condensate from the expansion of steam in a turbine is recovered and heated, prior to recycling to a steam generator, with steam extracted from the steam expansion, said steam generator producing flue gas, the process for recovering thermal energy from the flue gas, which comprises using said flue gas to heat the steam expansion condensate in the water cycle and extract heat from said flue gas by passing it in heat exchange with the steam heater condensate resulting from the heating of the steam expansion condensate with the expansion steam, the resultant steam being recycled to said heaters to heat said steam expansion condensate.
In a power generating system comprising a steam generator with a flue gas outlet, a turbine for expanding said steam, a plurality of heaters in series for heating steam expansion condensate from said turbine with expanded steam from said turbine, the improvement for extracting energy from said flue gas which comprises means for using said flue gas to generate steam from the steam heater condensate recovered from said heaters, and means for recycling said steam to said heaters to heat said steam expansion condensate.
Dependencies are inferred from the claim text.