Title:
REPOWERING SYSTEM OF STEAM POWER GENERATING EQUIPMENT
Document Type and Number:
Japanese Patent JPH04362207
Kind Code:
A
Abstract:
PURPOSE:To provide a repowering system of a steam power generating equipment where generation of steaming is prevented in a boiler economizer in a partially loaded condition, the gas turbine exhaust gas is introduced into a boiler by reducing the exhaust gas temperature when the gas turbine exhaust gas is high, and damages to, and deterioration of boiler components are suppressed. CONSTITUTION:In a system where a gas turbine is added to an existing power generating equipment, there is provided in series or in parallel to a high pressure stack gas cooler 25 an exhaust heat recovery boiler 30 which heats and evaporates the feed water by using a part of the exhaust gas from a gas turbine 22. There are provided a distributing means to control the distribution ratio of the exhaust gas to a gas boiler 1 and the exhaust heat recovery boiler, and a means to control the flow rate of the feed water to the exhaust heat recovery boiler respectively. When the system is partially loaded and the quantity of the feed water becomes small, the flow rate of the feed water to the exhaust heat recovery boiler is controlled by the control means, and the steam generated in the exhaust heat recovery boiler is consumed in a steam turbine cycle system. Thus, the heat exchanger duty of a boiler economizer or a high pressure stack gas cooler can be reduced by the quantity of the heat recovery by the exhaust recovery boiler.
Inventors:
OKITA NOBUO
Application Number:
JP13737691A
Publication Date:
December 15, 1992
Filing Date:
June 10, 1991
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
F01K23/10; F22D1/02; (IPC1-7): F01K23/10; F22D1/02
Attorney, Agent or Firm:
Hideaki Togawa