Pre-mixing on-duty nozzle
An on-duty nozzle and pre-mixing technology, which is applied in the direction of combustion methods, combustion chambers, combustion equipment, etc., can solve the problems of combustion stability decline, tempering, etc., and achieve the effects of uniform airflow, reduced vibration, and convenient flow distribution
Active Publication Date: 2014-12-03
CHINA UNITED GAS TURBINE TECH CO LTD
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Problems solved by technology
[0005] However, if the mixing length is too long, it is more likely to cause flashback and reduce combustion stability
Method used
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[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0026] The embodiment of the present invention provides a pre-mixing duty nozzle, which includes a nozzle housing 13, a swirler 14, a flow-restricting orifice 15, and an inner flow channel wall 16, and is characterized in that the nozzle housing 13 is divided into a radial section 131, an axial section 132 and expansion section 133, in the channel formed by the radial s...
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Abstract
The invention discloses a pre-mixing on-duty nozzle. The nozzle comprises a nozzle casing, cyclones, a throttling orifice plate and an inner flow channel wall surface and is characterized in that the nozzle casing is divided into a radial section, an axial section and an expansion section, fuel gas inlet pipes communicated with on-duty nozzle fuel channels in an end cover are arranged in a channel formed by the radial section and the end cover, and fuel spray ports are arranged on the fuel gas inlet pipes. According to the nozzle, a radial air guiding mode and a radial mixing section are arranged, so that the axial length of the nozzle is greatly reduced while the fuel and air mixing performance is improved. The improvement on the fuel and air mixing performance is beneficial to the reduction of pollutant emissions. The reduction of the axial length of the nozzle is beneficial to the improvement on the coordination of the combustion chamber head arrangement, so that usage and maintenance costs of a combustion gas turbine combustion chamber are reduced.
Description
technical field [0001] The invention relates to the field of gas fuel premixed combustion, in particular to a premixed duty nozzle. Background technique [0002] Due to the increasingly stringent requirements for environmental protection, premixed combustion is increasingly used in gas turbine combustors in recent years to reduce nitrogen oxide (NOx) emissions. [0003] figure 1 A typical combustor head structure with premixed combustion is shown. The duty nozzle 1 is arranged in the center, and a plurality of main nozzles 2 are evenly arranged around the duty nozzle 1 . Both main nozzles 2 adopt premixed combustion mode to reduce pollutant emissions. The duty nozzle 1 adopts the diffusion combustion mode, and the purpose is to maintain the premixed combustion stably. The on-duty nozzle 1 forms a stable diffusion flame in the expansion section 133, which is used as an ignition source for the main nozzle 2 to generate a premixed flame, thereby maintaining premixed combust...
Claims
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Inventor 方子文李珊珊查筱晨
Owner CHINA UNITED GAS TURBINE TECH CO LTD