Spray nozzle and gas turbine

Abstract

The invention relates to the technical field of power equipment, in particular to a spray nozzle and a gas turbine. The spray nozzle comprises a central body, an annular wall and a cyclone device. A peripheral mixing channel is formed between the annular wall and the central body, a central body mixing channel is arranged inside the central body, premixed fuel channels and a diffused fuel channel which are independent from one another are further respectively arranged on the central body, fuel can be respectively sprayed to the central body mixing channel and the peripheral mixing channel by the premixed fuel channels, fuel and air mixtures can be formed, fuel can be directly axially sprayed to a flame tube by the diffused fuel channel, and flame modes with middle diffusion combustion flame, inner-layer premixed combustion flame and outer-layer premixed combustion flame can be ultimately formed at an outlet of the spray nozzle. The spray nozzle and the gas turbine have the advantages that the flame stability and the combustion efficiency of the spray nozzle under low-load conditions can be greatly improved under the effect of diffusion combustion; the outlet of the spray nozzle is mainly structurally improved, and accordingly effects of facilitating structure machining and maintaining can be realized.

Description

technical field [0001] The invention relates to the technical field of power equipment, in particular to a nozzle and a gas turbine, and in particular to a nozzle with an interlayer diffusion flame. Background technique [0002] With the shortage of energy and the emphasis on environmental protection in the world, the requirements for gas turbine combustion chamber emissions and combustion efficiency are becoming more and more strict in various countries. Generally, it is required that gas turbines are in the load range of 50% and above, and the combustion chamber emissions can be maintained at a low level. , while maintaining high combustion efficiency. In order to achieve the purpose of low emission, premixed combustion technology is widely used. Therefore, the nozzle needs to achieve pre-mixing of fuel and air, and form a fuel-air mixture with uniform mixing and a certain speed at the nozzle outlet, and then enter the flame tube to participate in combustion. [0003] Si...

AI Technical Summary

Problems solved by technology

This method only improves the stability of the local recirculation zone from the perspective of aerodynamics, and only has a certain effect on the stability of the premixed flame, and due to the nature of premixed combustion, this method cannot reliably improve the flame stabilization performance of the nozzle , and it cannot guarantee that the premixed flame has higher combustion efficiency under lower load; in addition, from the perspective of processing technology, the structural processing and connection of the inner layer baffle of this premixed nozzle is relatively complicated, and it is not easy to maintain and replace

Images