US 4,164,848 A · Method and apparatus for peak-load coverage and stop-gap reserve in steam power plants

Abstract

An arrangement for storing energy to cover peak-load conditions and serve as a stop-gap reserve in steam power plants. A live steam generator is connected to a steam turbine, and a storage vessel is provided with a steam cushion volume and a water content volume. The water content of the storage vessel is connected, on the one hand, to a single-or multi-stage secondary steam generator which is connected, in turn, on the steam side to the turbine by a working steam line. A hot-water return line connects the secondary steam generator on the water side to the feed water line and/or a compensation vessel connected to the feed water line. The steam cushion volume of the storage vessel is connected, on the other hand, by a steam line, to a point of the main steam cycle of the plant which is upstream of the entry point of the working steam line. In particular, the steam cushion is connected to the live steam line. The secondary steam generator may be in the form of one or several flash tanks or heat exchangers. It also may consist of several superheaters through which hot water flows.

Claims29

Dependent claims

An arrangement for energy storage for peak load coverage and reserve in a steam power plant, comprising:

live steam generator means;
a steam turbine connected to said live steam generator means by a live steam line;
a storage vessel with steam cushion volume and water content volume;
a secondary steam generator with at least one stage;
means for connecting said water content volume of said storage vessel to said secondary steam generator;
a working steam line connecting said secondary steam generator on the steam side to said steam turbine;
a feed water line;
a cold water reservoir;
a hot-water return line connecting said secondary steam generator on the water side to said feed water line and said cold water reservoir, said cold water reservoir being connected to said feed water line;
a superheater;
an auxiliary steam line connecting said steam cushion volume of said storage vessel to a point of the main steam cycle of the plant upstream of the entry point of said working steam line and to said live steam line following said superheater.

8 more elements

A method for energy storage for peak load coverage and reserve in a steam power plant, comprising the steps of:

connecting a steam turbine to a live steam generator means with a live steam line and a turbine valve therein;
connecting a storage vessel with steam cushion volume and water content volume so that the water volume communicates with a secondary steam generator having at least one stage by a hot water line;
connecting said secondary steam generator on the steam side to said steam turbine by a working steam line;
connecting said secondary steam generator on the water side to a feed water line and a cold water reservoir by a hot-water return line, connecting said cold water reservoir to said feed water line;
connecting said steam cushion volume of said storage vessel to a point of the main steam cycle of the plant upstream of the entry point of said working steam line by an auxiliary steam line with a steam valve therein;
opening a flash steam valve in a line between said secondary steam generator and said storage vessel at peak load or overload;
actuating a storage water pump in said hot-water return line and reducing delivery of a feed water pump connected to said cold water reservoir;
and reducing delivery substantially at full peak load.

5 more elements

Dependencies are inferred from the claim text.

Method and apparatus for peak-load coverage and stop-gap reserve in steam power plants

Life of this patent

Method and apparatus for peak-load coverage and stop-gap reserve in steam power plants

Life of this patent

Abstract

Claims29