Premixing device and micro gas turbine

Abstract

The invention relates to the field of energy system design and discloses a premixing device and a micro gas turbine. The premixing device is used for mixing fuel and air, wherein the fuel comprises pilot-stage fuel and primary-stage fuel. The premixing device comprises a shell. The shell comprises a front plate, a rear plate and a plurality of rotational flow blades connected with the front plateand the rear plate. The multiple rotational flow blades are evenly arranged in the circumferential direction of the front plate to form an air inlet, and the center of the front plate is provided witha pilot-stage fuel inlet. A primary-stage fuel inlet is formed in the edge of the end face of the end, connected with the rotational flow blades, of the rear plate, and a mixed gas outlet is formed in the other end of the rear plate. The primary-stage fuel is sprayed in towards an upper plate, more distributed around the interior of the shell and less distributed in the middle of the shell, the pilot-stage fuel is sprayed in towards a lower plate, less distributed around the interior of the shell and more distributed in the middle of the shell, therefore, uniformity of mixing of the pilot-stage fuel, the primary-stage fuel and the air can be improved through the premixing device, the structure is simple, and operation is convenient.

Description

technical field [0001] The invention relates to the field of energy system design, in particular to a premixing device and a micro gas turbine. Background technique [0002] In the field of energy technology, micro gas turbines are widely used due to their compact structure, light weight, and low maintenance costs. Concern, and the laws and regulations and related policies related to the control of pollutant emissions have been continuously introduced, and people have put forward higher and higher requirements for the energy efficiency of micro gas turbines and the emission of combustion pollutants. [0003] The combustion products of micro gas turbines contain NOx (nitrogen oxides), mainly including NO (nitrogen monoxide) and NO2 (nitrogen dioxide). Among them, NO is a colorless and odorless gas. When the concentration of NO reaches a certain level, it will The combination of hemoglobin in the blood causes blood hypoxia and central nervous paralysis; NO2 is a red poisonous...

AI Technical Summary

Problems solved by technology

However, under the current pre-mixing technology, the mixing of fuel and air is not uniform enough, resulting in localized combustion and high temperature, resulting in more NOx emissions

In addition, when the fuel injection pressure of the main combustion stage is not enough, the fuel penetration depth is small, which makes the premixing uniformity worse, and also leads to more NOx emissions

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