Multipoint direct injection head structure for low-pollution combustion chamber of gas turbine

Abstract

The invention discloses a multipoint direct injection head structure for a low-pollution combustion chamber of a gas turbine. Multiple secondary combustion stage swirl nozzle molds and primary combustion stage swirl nozzle molds of the same structure are adopted for being evenly distributed and fixedly connected in the circumferential direction of the center of a combustion chamber head flange, and the primary combustion stage swirl nozzle molds are located on the periphery of the secondary combustion stage swirl nozzle molds in the circumferential direction. An air flow path of the swirl nozzle molds is formed by an air inlet, a swirl flow channel, an annular swirl flow air straight channel, an annular swirl flow air convergence channel and a swirl flow air outlet, and speed distribution with the inner side lower than the outer side in the radial direction is formed at the swirl flow air outlet. A fuel oil flow path is formed by a fuel oil inlet, a nozzle and a nozzle outlet. The nozzle outlet is flushed with the swirl flow air outlet, the nozzle molds work in a non-premixed combustion manner, the phenomena of spontaneous combustion and tempering are avoided, and the risk of oscillating combustion is reduced. The temperature of a combustion area is low, combustion is stable, and generated thermal nitric oxide is effectively reduced. Pollutant emissions are few, and the multipoint direct injection head structure is suitable for the low-pollution combustion chamber of the gas turbine.

Description

technical field [0001] The invention relates to the technical field of combustion chambers of gas turbines, in particular to a multi-point direct injection head structure for low-pollution combustion chambers of gas turbines. Background technique [0002] The source of gas turbine pollutant emissions comes from the combustion chamber, so the development of low-pollution combustion technology is the key to reducing gas turbine pollutant emissions. The main pollutants in the combustion chamber include nitrogen oxides, carbon monoxide and unburned hydrocarbons, the most important of which is to reduce the generation of nitrogen oxides. In the combustion chamber, the thermal nitrogen oxide formation mechanism plays a leading role, so reducing the combustion temperature in the combustion zone is one of the effective means to reduce the formation of nitrogen oxides. Lean fuel combustion technology can effectively reduce the combustion temperature in the combustion zone, thereby r...

AI Technical Summary

Problems solved by technology

Gaseous fuel can be directly and quickly mixed with air, but liquid fuel must be well atomized and mixed with air to form a combustible mixture, so this burner is not suitable for liquid fuel, and cannot solve the problem of low-pollution combustion using liquid fuel gas turbines

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