A swirler and a premix burner using it

Abstract

The invention discloses a swirler. The swirler comprises an outer wall, an inner wall and swirl vanes arranged between the outer wall and the inner wall, wherein the swirl vanes comprise big and small vanes which are arranged in a peripheral direction; both the big vanes and the small vanes comprise straight vane sections parallel to the central line of the swirler and bent vane sections having included angles with the central line of the swirler. A pre-mixing combustor comprising the swirler comprises a combustion gas turbine of the pre-mixing combustor, a boiler, an internal combustion engine or an aero-engine. According to the swirler and the pre-mixing combustor adopting same, the straight vane sections of the big vanes mainly achieve rectifying action, and the bent vane sections of the large vanes are used for regulating an airflow direction; and small vanes are used for regulating airflow speed distribution among large vanes to eliminate a low-speed airflow area, so that a tempering phenomenon is eliminated in a facilitated manner.

Description

technical field [0001] The invention relates to a burner, in particular to a swirler and a premixed burner using it. Background technique [0002] Frequent phenomena such as smog and acid rain have seriously affected people's lives, making people have to attach great importance to environmental issues. The survey found that the pollutants that produce smog, acid rain and other phenomena mainly come from the combustion process of gas turbines, boilers, internal combustion engines and aero engines. The country has established strict standards for controlling the pollutant emissions of combustion equipment, and equipment that does not meet the standards will be gradually eliminated. Therefore, relevant manufacturers are working hard to develop new combustion technologies to reduce emissions. The combustion mode used in gas turbine combustors, boilers, etc. is usually diffusion combustion, and its main pollutant emissions are carbon monoxide (CO), nitrogen oxides (NO X ) and ...

AI Technical Summary

Problems solved by technology

This is a major problem faced by premixed combustion. The usual solutions and adverse effects are: (1) retain a small amount of fuel injection on the end face 3b of the center body to form a diffusion flame and keep the flame stable, but it will increase the local high temperature area, Not conducive to reducing NO X ; (2) increase the gas flow rate in the premixing channel to prevent the flame from propagating upstream, but it will not eliminate the formation of low-velocity zones or even backflow vortices at the back of the swirl blades, and these zones will still become the stagnant zones of the flame after tempering; (3) Increase the distance between the trailing edge of the blade 9 of the swirler 2 and the end face 3b of the central body, but this will increase the length of the burner and may induce boundary layer tempering

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