US 4,907,406 A · Combined gas turbine plant

Abstract

A combined gas turbine plant comprises an air compressor, a combustor including a combustion chamber, a gas turbine, a steam turbine, and an exhaust heat recovery device having a denitration device and arranged at a location through which an exhaust gas passage for leading exhaust gas from the gas turbine to the atmosphere extends. An air extraction pipe equipped with a valve is provided for extracting a part of the air from the air compressor to prevent surging of the air compressor during starting of the plant, and another air extraction pipe equipped with a valve is provided for extracting a part of the air from an air passage extending from the compressor to the combustion chamber to improve stability of a flame and combustibility in the combustion chamber during the plant starting. The extraction pipes extend to and hence lead the extracted air into a portion of the exhaust gas passage located downstream of the denitration device.

Claims9

Dependent claims

A combined gas turbine plant comprising:

an air compressor;
a combustor including at least one combustion chamber and adapted to generate a gas of high temperature and high pressure by burning fuel in said at least one combustion chamber while utilizing as an oxidizer air compressed by said air compressor;
a gas turbine adapted to be operated by the gas of high temperature and high pressure generated by said combustor;
exhaust heat recovery means including denitration means arranged at a location through which an exhaust gas passage for leading exhaust gas from said gas turbine to the atmosphere extends, said exhaust heat recovery means recovering exhaust heat from said exhaust gas to generate steam of high temperature and high pressure;
a steam turbine driven by the steam of high temperature and high pressure generated by said exhaust heat recovery means;
air extraction means for leading a part of the air flowing from said air compressor to said at least one combustion chamber of said combustor into a portion of said exhaust gas passage located downstream of said denitration means.

3 more elements

Dependencies are inferred from the claim text.

Combined gas turbine plant

Life of this patent

Combined gas turbine plant

Life of this patent

Abstract

Claims9