Gas turbine combustor and gaseous fuel supply method for gas turbine combustor
View Patent ↗A combustor includes two upstream parts of fuel supply system supplying gaseous fuels of two types having different heating values from each other, a three-way fuel transfer valve merging the two upstream parts of fuel supply system with each other, a plurality of gaseous fuel supply subsystems supplying a combustion chamber with the gaseous fuels supplied through the three-way fuel transfer valve and branched, and a plurality of burners injecting, corresponding to each of the gaseous fuel supply subsystems, the gaseous fuel supplied from the gaseous fuel supply subsystem into the combustion chamber.
1. A combustor comprising:
two upstream parts of fuel supply system for supplying gaseous fuels of two types having different heating values from each other;
a three-way fuel transfer valve for merging the two upstream parts of fuel supply system with each other;
a plurality of gaseous fuel supply subsystems for supplying a combustion chamber with the gaseous fuels supplied through the three-way fuel transfer valve;
a plurality of burners for injecting, corresponding to each of the gaseous fuel supply subsystems, the gaseous fuel supplied from the gaseous fuel supply subsystem into the combustion chamber; and
a low Btu gas-exclusive subsystem disposed in parallel with the gaseous fuel supply subsystems, wherein:
the low Btu gas-exclusive subsystem includes:
a gaseous fuel flow control valve for adiusting the flow rate of the low Btu gas;
a gas shutoff valve disposed upstream of the gaseous fuel flow control valve; and
a purge subsystem disposed downstream of the gaseous fuel flow control valve.
2. The combustor according to claim 1 , wherein:
one of the gaseous fuels is liquefied natural gas (LNG) and the other of the gaseous fuels is an off gas having a lower heating value than the LNG, a coke oven gas generated during steel production processes, or other mixed gas containing hydrogen or carbon monoxide.
3. A combustor comprising:
two upstream parts of fuel supply system for supplying gaseous fuels of two types having different heating values from each other;
a three-way fuel transfer valve for merging the two upstream parts of fuel supply system with each other;
a gaseous fuel pressure regulation valve for regulating pressure of the gaseous fuels supplied through the three-way fuel transfer valve;
a plurality of gaseous fuel supply subsystems for supplying a combustion chamber with the gaseous fuels supplied through the gaseous fuel pressure regulation valve;
a gaseous fuel flow control valve disposed in each of the gaseous fuel supply subsystems, the gaseous fuel flow control valve being adapted to adjust a gaseous fuel flow rate; and
a plurality of burners for injecting, corresponding to each of the gaseous fuel supply subsystems, the gaseous fuel supplied from the gaseous fuel supply subsystem into the combustion chamber, wherein:
one of the plurality of gaseous fuel supply subsystems includes branches branched downstream of the gaseous fuel flow control valve and a gas shutoff valve disposed in the branches.