US 7,028,480 B2 · Steam temperature control system, method of controlling steam temperature and power plant using the same

Abstract

A steam temperature control system for a power plant for controlling a temperature of steam flowing through steam pipes connected to a heat exchanger to a target temperature by spraying water by means of a spray valve of an attemperator, having a target temperature calculation section for calculating the target temperature of the steam for determining the target temperatures of the plural steam pipes connected to the heat exchanger in respective steam pipes connected to a common heat exchanger; and an instruction value calculation section for calculating command values to the spray valves disposed to the respective steam pipes, based on the target temperatures determined by the calculation in the target temperature calculating section.

Claims12

Dependent claims

a target temperature calculation section for calculating the target temperature of the steam for determining the target temperatures of the plural steam pipes connected to the heat exchanger in respective steam pipes connected to a common heat exchanger;
and
an instruction value calculation section for calculating command values to the spray valves disposed to the respective steam pipes, based on the target temperatures determined by the calculation in the target temperature calculating section.

A method of controlling a steam temperature of a power plant, which controls a steam temperature to a target temperature of steam flowing through steam pipes connected to a heat exchanger by spraying spray water against valves of an attemperator, comprising:

determining steam temperature target values of respective steam pipes connected to a common heat exchanger;
and
based upon the determined steam temperature target value of the respective steam pipes, calculating control command values against the spray valves disposed to each of the steam pipes.

A power plant comprising:

a heat source for generating steam by heating feed water;
at least one heat exchanger disposed to the heat source;
steam pipes connected to the heat exchanger;
a pair of attemperators for adjusting temperature of steam flowing, the steam pipes when spray water is sprayed by spray valves disposed to the respective steam pipes;
a steam temperature target value calculating section for determining steam temperature target values of the respective steam pipes;
and
a spray control command value calculating section for calculating control command values to the spray valves disposed to the respective steam pipes, based on the steam temperature target values of the respective steam pipes determined by the steam temperature target value calculating section.

4 more elements

Dependencies are inferred from the claim text.

Steam temperature control system, method of controlling steam temperature and power plant using the same

Life of this patent

Steam temperature control system, method of controlling steam temperature and power plant using the same

Life of this patent

Abstract

Claims12