Gas turbine combustion chamber and gas turbine

Abstract

The invention relates to a gas turbine combustion chamber and a gas turbine. The gas turbine combustion chamber comprises a first head (26) and a second head (38), the first head (26) comprises a first primary combustion stage channel, and an included angle between an airflow direction in the first primary combustion stage channel and the center line of the first head (26) is a first divergence angle; the second head (38) comprises a second primary combustion stage channel, and an included angle between an airflow direction in the second primary combustion stage channel and the center line ofthe second head (26) is second divergence angle; and the first divergence angle is larger than the second divergence angle, and the first head (26) and the second head (38) are arranged in the circumferential direction of the gas turbine combustion chamber (4). The gas turbine comprises the gas turbine combustion chamber. Two heads are arranged at the same time, the ignition performance of the gasturbine combustion chamber can be improved, the problem of combustion oscillation can further be solved, the combustion stability is improved, and the comprehensive performance of a full-ring combustion chamber is improved.

Description

technical field [0001] The invention relates to the technical field of gas turbines, in particular to a combustion chamber of a gas turbine and a gas turbine. Background technique [0002] The emission limit of aero-engine pollution is becoming more and more stringent. Judging from the development trend of aero-engine products in the future, the emission of nitrogen oxides (NOx) should be further reduced by 45% compared with the current standard CAEP / 6 stipulated by the International Civil Aviation Organization (ICAO). %~60%. Controlling the NOx emission of the combustion chamber is mainly realized by controlling the temperature in the combustion chamber, and one of the main technical ways to control the combustion temperature is to adopt the lean fuel premixed combustion mode. When the lean fuel premixed combustion mode is used, the air and fuel are not mixed in the combustion flame, but pre-mixed, and a uniform mixture of oil and gas is sent to the combustion zone after m...

AI Technical Summary

Problems solved by technology

[0004] For the centrally staged lean premixed combustor, if you want to get lower NOx, you must minimize the fuel flow in the pre-combustion stage, reduce diffusion combustion, and let more fuel enter the main combustion stage for pre-mixed combustion to reduce the combustion zone temperature, but in general, the proportion of fuel in the pre-combustion stage accounts for 10% of the total fuel, and the remaining 90% of the fuel is premixed and combusted through the main combustion stage, which may cause combustion instability

In addition, because the pre-combustion stage is wrapped in the main combustion stage, and the air flow rate of the main combustion stage is much larger than that of the pre-combustion stage, the air flow rate at the outlet of the main combustion stage is high, making it difficult to ignite

[0005] Using lean premixed combustion means that more air is introduced into the head combustion area, so that the head air velocity increases, which is not conducive to ignition

In addition, a large number of experimental studies have shown that lean fuel premixed combustion can easily lead to flame instability

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