Supercritical pressure once-through boiler
AssigneeMitsubishi Jukogyo Kabushiki Kaisha
InventorsSeiji Fukuda, Kaneko Shozou, Takuji Fujikawa, Hiroshi Oda, Tadashi Gengo, Kazushi Fukui
Life of this patent
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Abstract
In order to obviate a short life and an expensive maintenance cost of boiler throttle valves as well as plant loss caused by pressure reduction at the boiler throttle valves in a supercritical pressure once-through boiler a supercritical pressure once-through boiler, in which boiler water transformed into steam in boiler furnace wall tubes is further heated in a superheater and is then fed to a main turbine, is improved in that boiler throttle valves and a heat recovery apparatus are provided on the downstream side of the boiler furnace wall tubes.
Claims6
A supercritical pressure once-through boiler comprising boiler furnace wall tubes in which boiler water is transformed into steam, a main turbine operatively connected to said boilder furnace wall tubes so as to be driven by the steam, a final superheater operatively connected in the once-through boiler between said boiler furnace wall tubes and said main turbine for superheating the steam produced in the furnace wall tubes before the steam passes to said main turbine, heat recovery means for reducing the pressure of steam by converting the pressure of the steam to mechanical energy and a boiler throttle valve, said heat reovery means and said boiler throttle valve operatively connected in the once-through boiler between said boiler furnace wall tubes and said final superheater.
A supercritical pressure once-through boiler as claimed in claim 7, and further comprising a primary superheater operatively connected in the once-through boiler between said boiler furnace wall tubes and said final superheater, said heat recovery means operatively connected in the once-through boiler between said primary and said final superheaters.
Dependencies are inferred from the claim text.