| 摘要 |
PURPOSE:To obtain the gas fuel injecting device having the suitable characteristic for a large capacity gas turbine by a method wherein a structure is designed so that a bellow having a guide port is held in a slidable manner in an innercylinder having a fuel injecting port. CONSTITUTION:A fuel gas introduced from a fuel introducing port 3 is guided into a housing 1, and the fuel gas has a tendency to push out an inner cylinder 5 toward the inside of a burner according to the pressure difference between the burner inner pressure and the fuel gas pressure. Meantime, the moving of the inner cylinder 5 is restrained by a bellows 7, the force acted on the bellows 7 is obtained from the roduct of multiplying the difference pressure between the burning gas pressure in the housing 1 and the burner inner pressure by the pressure receiving part area of the inner cylinder 5. Since the bellows 7 is extended or contracted to keep the balance with said force, the inner cylinder 5 is moved, and accordingly the relationship between the position of an introducing port 10 of the inner cylinder 5 and the position of an injecting port 8 of an outer cylinder 4 is changed, that is, the real effective sectional area from the introducing port 10 to the injecting port 8 is changed. Therefore, by increasing the gas pressure in accordance with the increasing of the inner pressure of the burner, the effective sectional area is increased, and accordingly the fuel flow rate can be incresed.
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