Gas turbine combustor axial two-stage swirl nozzle with opposite directions

Abstract

The gas turbine combustor has two stages of swirl nozzles with opposite directions in the axial direction, which are characterized in that two stages of swirl devices with opposite swirl directions are arranged in the axial direction in the peripheral axial annular air passage, and are respectively fixed on the central cone; The first-stage swirl device adopts hollow blades and communicates with the central fuel channel, and there are fuel injection holes on both sides of the hollow blades; the air inlet of the second-stage swirl device is close to the air outlet of the first-stage swirl device, and the second-stage swirl device The inlet angle of the flow device is the same as the air flow angle at the outlet of the first-stage swirl device, and the blades of the two-stage axial swirl devices are staggered. The invention can effectively increase the airflow velocity at the inner peripheral side of the air passage, strengthen the mixing of fuel gas and air, ensure reasonable nozzle outlet velocity distribution, and evenly mix fuel and air, thereby improving combustion stability. At the same time, the influence of the central cone boundary layer on the nozzle outlet velocity pattern is reduced, so that no recirculation zone is generated downstream of the central cone, and the combustion reliability is improved.

Description

technical field [0001] The invention relates to a two-stage swirl nozzle with opposite directions in the axial direction of a combustion chamber of a gas turbine, in particular to a low-pollution combustion chamber nozzle of a gas turbine 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 polluta...

AI Technical Summary

Problems solved by technology

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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