Subcritical pressure high-temperature steam power plant and subcritical pressure high-temperature variable pressure operation once-through boiler
AssigneesBabcock-Hitachi Kabushiki Kaisha, Hitachi, Ltd.
InventorsYoshiki NOGUCHI, Toshihiko SASAKI, Jun KOIZUMI, Kazuhiko SAITO, Yuichi YOSHIDA, Noboru SHINOTSUKA
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Abstract
A subcritical pressure high-temperature steam power plant includes a combustion boiler system, steam turbine generator system, and condensate and feedwater system and wherein the conditions of steam generated in the boiler system and supplied to the steam turbine generator system are subcritical pressure and high temperature (turbine inlet temperature of 593° C. or more).
Claims8
A subcritical pressure high-temperature steam power plant comprising:
- a combustion boiler system;
- a steam turbine generator system;
- and
- a condensate and feedwater system,
- wherein the combustion boiler system includes a high-temperature superheater for supplying superheated steam with steam conditions of subcritical pressure and 593° C. or more and a high-temperature reheater for supplying reheated steam with steam conditions of 593° C. or more, and
- wherein the steam turbine generator system includes a high-pressure steam turbine to be driven by the superheated steam with the steam conditions of subcritical pressure and 593° C. or more and a reheat intermediate-pressure steam turbine to be driven by the reheated steam with the steam conditions of 593° C. or more.
A subcritical pressure high-temperature variable pressure operation once-through boiler for use in a thermal power plant in which rated output of a single generator is in a range from 0.1 million kW to 0.4 million kW,
- the boiler comprising a coal mill, a burner, a furnace, a furnace water wall tube, a fuel economizer, a high-temperature superheater, a high-temperature reheater, and a steam separator,
- wherein the furnace water wall tube is of a once-through spiral type;
- and
- wherein the high-temperature superheater generates superheated steam with steam conditions of subcritical pressure and 593° C. or more and the high-temperature reheater generates reheated steam with steam conditions of 593° C. or more.
Dependencies are inferred from the claim text.