Air swirl device arranged in spray nozzle of combustion chamber of gas turbine

Abstract

The invention relates to an air swirl device arranged in a spray nozzle of a combustion chamber of a gas turbine and belongs to the technical field of the gas turbine. The air swirl device comprises a center fuel passage and a peripheral ring-shaped air passage. The peripheral axial ring-shaped air passage is axially provided with a primary air swirl device outside a center cone; a blade of the air swirl device is provided with an incision part; the initial position of the incision part is positioned at a change point of a bending angle of the blade of the suction side of the blade; the intersecting line of the tangent plane of the incision part and the suction side of the blade is vertical to the horizontal plane where the axis of the blade is positioned; the direction of the tangent plane is along the tangential direction of the change point of the bending angle of the suction side of the blade; the length of the incision part runs through the tail of the blade. According to the invention, the swirl intensity of the external peripheral side of the air passage can be ensured, the airflow speed of the internal peripheral side of the air passage is improved, speed distribution of an outlet of the spray nozzle is matched with a mixing effect of fuel and air, a combustion region is reasonably controlled and an internal flow field structure of the combustion chamber is kept, so that stability of combustion and better outlet temperature distribution are ensured.

Description

technical field [0001] The invention relates to an air swirling device arranged in a gas turbine combustion chamber nozzle, in particular to a gas turbine low-pollution combustion chamber nozzle using natural gas fuel. Background technique [0002] In my country's current energy structure, thermal power generation using traditional coal-fired technology occupies the vast majority of the share. However, this traditional power generation technology has disadvantages such as low power generation efficiency, high pollutant emissions (especially NOx emissions), and high consumption of fresh water resources. As one of the clean energy technologies, the gas turbine power generation technology fueled by natural gas can effectively reduce pollutant emissions while meeting the power generation load requirements. Among them, the design of the gas turbine combustor nozzle is particularly important for organizing combustion and reducing pollutant emissions . [0003] In the combustion ...

AI Technical Summary

Problems solved by technology

[0004] However, due to the gap at the bottom of the air swirl vane, the airflow deflection angle on the inner peripheral side of the channel is small, and the swirl strength is weak, which leads to poor mixing effect of fuel and air on this side, affecting the organization of combustion and the generation of pollutants

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