Spray nozzle and gas turbine with same

Abstract

The invention relates to the technical field of power equipment, in particular to a spray nozzle and a gas turbine with the same. The spray nozzle comprises a central body, an annular wall and a cyclone device. Premixed fuel channels and a diffused fuel channel which are independent from one another are respectively arranged on the central body; fuel can be respectively sprayed to a central body mixing channel and a peripheral mixing channel by the premixed fuel channels, so that fuel and air mixtures can be formed; fuel can be directly sprayed into the fuel and air mixtures at positions, which are close to the end walls of the central body, by the diffused fuel channel, the fuel and air mixtures are sprayed out of the central body mixing channel, partial premixed combustion flame can be ultimately formed in the center of an outlet of the spray nozzle, the fuel and air mixtures which are sprayed out of the peripheral mixing channel can be ignited, and peripheral premixed combustion flame can be formed. 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 the partial premixed combustion flame in the center of the outlet of the spray nozzle, and 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 provided with the nozzle, and in particular to a nozzle adopting partial premixed combustion. Background technique [0002] With the energy shortage and the world's attention to environmental protection issues, countries have increasingly strict requirements on gas turbine combustor emissions and combustion efficiency. Generally, gas turbines are required to maintain a low level of combustion chamber emissions in the 50% and above load range. , 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 realize the pre-mixing of fuel and air, and form a fuel-air mixture at the outlet of the nozzle that is uniformly mixed and has a certain speed, and then enters the flame tube to participate in combustion. [0003] Since the fuel inj...

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

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