Siemens Aktiengesellschaft

Siemens Energy, Inc.

Siemens Power Generation, Inc.

Gerald J Feller

James C Bellows

Michael Scot Briesch

Teri J Robertson

John H Copen

Alan K Kortgoede

Zaher El Zahab

Gilberto Miranda-Velazquez

A heat recovery steam generator (HRSG) () including: an economizer () configured to heat a working fluid by extracting heat from a flow of flue gas (). The HRSG includes a diluting fluid injector arrangement () configured to inject a diluting fluid () effective to dilute a concentration of a gaseous corrosive when compared to an undiluted concentration of the gaseous corrosive in the flow of flue gas. The HRSG also includes a preheater () configured to preheat the diluting fluid prior to injection.

Localized flue gas dilution in heat recovery steam generator

A system for use in a combined cycle power plant including gas and steam turbines includes a single kettle boiler and a valve system. The valve system is operated such that feedwater from a first source passes into the kettle boiler during certain operating conditions, whereas feedwater from a second source passes into the kettle boiler during other operating conditions, wherein the first and second sources have feedwater under different pressures. Rotor cooling air extracted from a compressor section of the gas turbine is cooled with the feedwater in the kettle boiler, wherein at least a portion of the feedwater is evaporated in the kettle boiler by heat transferred to the feedwater from the rotor cooling air to create steam, wherein the valve system is operated to selectively deliver the steam to a first or second steam receiving unit depending on the operating conditions.

Selective pressure kettle boiler for rotor air cooling applications

A method of operating a gas turbine power plant including an auxiliary power output for reducing power plant emissions. A heat recovery steam generator receives an expanded working medium from a gas turbine and removes heat from the expanded working medium to form a reduced temperature exhaust gas and to generate steam from the heat removed from the expanded working medium. A steam turbine and generator assembly operates on the steam to produce an auxiliary plant output. A selective catalytic reduction (SCR) system is provided for receiving the reduced temperature exhaust gas; and an auxiliary fan is powered by the auxiliary plant output to supply dilution air for further reducing the temperature of the exhaust gas to prior to passing the exhaust gas through the SCR system.

Method of operating a gas turbine power plant with auxiliary power to reduce emissions

A power plant including a steam turbine, and a steam turbine exhaust duct configured to deliver uncontaminated fluid from the steam turbine to downstream components of the power plant. The steam turbine exhaust duct includes a steam turbine exhaust duct isolation valve selectively configured to prevent fluid communication between the steam turbine exhaust duct and the downstream components of the power plant, and a steam turbine exhaust duct vent with a steam turbine exhaust duct vent valve. The steam turbine exhaust duct vent is configured to deliver contaminated fluid from the steam turbine exhaust duct to a fluid sink upon opening of the exhaust duct vent valve.

Air vent in main steam duct of steam turbine

A gas turbine cycle that utilizes the vaporization of liquefied natural gas as a source of inlet air chilling for a gas turbine. The cycle uses regeneration for preheating of combustor air and offers the potential of gas turbine cycle efficiencies in excess of 60%. The systems and methods permit the vaporization of LNG using ambient air, with the resulting super cooled air being easier to compress and/or having fewer contaminants therein. As the air is easier to compress, less energy is needed to operate the compressor, thereby increasing the efficiency of the system. A portion of the vaporized natural gas may be used as the combustion fuel for the gas turbine system, thereby permitting multiple turbines to be operated using a single topping cycle. In alternative embodiments, the vaporization of the LNG may be used as part of a bottoming cycle to increase the efficiencies of the gas turbine system.

Growing community of inventors

Orlando, FL, United States of America

Gerald J Feller