Lean oil multipoint direct injection head for low-pollution combustion chamber of gas turbine

Abstract

The invention discloses a lean oil multipoint direct injection head for a low-pollution combustion chamber of a gas turbine. The lean oil multipoint direct injection head is composed of multiple swirl nozzle molds of the same structure. A secondary combustion stage is composed of a swirl nozzle mold located in the center and three swirl nozzle molds circumferentially and evenly distributed along the center swirl nozzle mold at equal distance. A primary combustion stage is composed of swirl nozzle molds alternate with the three swirl nozzle molds of the secondary combustion stage. The primary combustion stage and the secondary combustion stage can be independently controlled, and it is guaranteed that the combustion chamber can stably work in a wide working state. A lean oil direct injection combustion technology is adopted, a nozzle outlet is flushed with a swirl flow air outlet, the nozzle molds work in a non-premixed combustion manner, the phenomena of spontaneous combustion and tempering can be avoided, and the risk of oscillating combustion is reduced. The working equivalence ratio of the nozzle molds ranges from 0.6 to 0.8, it is guaranteed that the temperature of a combustion area is low and combustion is stable, and generated thermal nitric oxide is effectively reduced. Pollutant emissions are few, and the lean oil multipoint direct injection head is simple in structure and 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 lean oil multi-point direct injection head used in 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, thereb...

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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