Nozzle, nozzle array and burner for widening tempering margin

Abstract

The invention provides a nozzle for widening a tempering margin, a nozzle array and a combustor. A rectifying device of the nozzle can enable currents of fuel gas and air entering the nozzle to become more stable and uniform, so that the tempering caused by hot spots in combustion can be effectively prevented; a step-shaped expansion section of the nozzle can stop propagation of the tempering to the upstream, so that the tempering margin is widened; and as a direct passing way wave structure and a center cone are arranged in an inner-layer cylinder of the nozzle, the combustion efficiency is further improved, the pollutant discharge is reduced, and the combustion state is improved.

Description

technical field [0001] The invention relates to the technical field of combustion devices, in particular to a nozzle for widening the tempering margin, which is especially suitable for various industrial burners such as gas turbines, boilers and chemical furnaces. Background technique [0002] Gas turbines are widely used in electric power, aviation, petrochemical and other industries due to their small size and large output power. Due to the energy crisis and environmental deterioration, it is urgent to develop high-efficiency and clean combustion chambers, which are required to have the characteristics of reliable ignition, stable combustion, high efficiency and low emissions. At present, the problem of environmental pollution in our country is very serious, and it is very urgent to develop clean combustion technology of gas turbines. Gas turbine manufacturers have developed a variety of clean combustion technologies, such as lean premixed combustion technology, dilute-ph...

AI Technical Summary

Problems solved by technology

[0003] The advantages of diffusion combustion are that there will be no backfire phenomenon during operation, high safety factor, stable and reliable operation, in addition, it has the advantages of easy ignition, thermal load adjustment, and wide adjustable range of thermal load. The disadvantage is that it only relies on diffusion during combustion. The effect makes the air and gas contact with each other to produce a chemical reaction, so the flame length of the diffusion burner is longer, and the heat release intensity per unit volume is not high

The advantage of premixed combustion is that it can reduce pollutant emissions through technologies such as lean premixed combustion and dilute-phase premixed pre-evaporation. Due to the pre-mixing of fuel and oxidant, the influence of the combustion reaction on the mixing time scale can be basically ignored, which greatly improves the Combustion reaction speed and flame propagation speed, the disadvantage is that the flame stability is poor, and tempering will bring safety hazards, especially when the fuel flame propagation speed is fast, the tempering problem is more prominent, such as burning hydrogen or hydrogen-rich fuel

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