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Coaxial staged combustor for low-pollution combustion chamber of gas fuel gas turbine

A technology of gas turbines and gas fuels, applied in the direction of combustion chambers, continuous combustion chambers, combustion methods, etc., can solve problems such as combustion instability, and achieve the effects of preventing ablation burners, low pollutant emissions, and uniform fuel flow

Active Publication Date: 2021-08-27
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Because lean premixed combustion is prone to combustion instability, people have proposed coaxial staged combustion tec

Method used

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  • Coaxial staged combustor for low-pollution combustion chamber of gas fuel gas turbine
  • Coaxial staged combustor for low-pollution combustion chamber of gas fuel gas turbine
  • Coaxial staged combustor for low-pollution combustion chamber of gas fuel gas turbine

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Embodiment 1

[0030] refer to Figure 1 to Figure 4 , this embodiment is used for the coaxial staged burner of the low-pollution combustion chamber of the gas turbine. The hub fuel ring cavity is set in the outer hub of the swirler, the blade fuel cavity is set in the second and third stage swirl blades, the center blunt body fuel cavity is set in the center blunt body of the swirler; the hub fuel ring cavity is set outside the first stage Four fuel branch circuits, rectified fuel ring chambers are set in front of the outer hubs of the second and third stages to ensure uniform fuel flow in the interblade flow channels of the same stage.

[0031] The swirl vane is located in the tapered swirl channel, the tapered mixing section is located behind the swirl vane in the tapered swirl channel, the first-stage fuel branch is located in front of the first-stage outer hub, and the rectified fuel ring cavity is located in the second In front of the outer hubs of the first and third stages, the hub ...

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Abstract

The invention belongs to the technical field of combustion chambers of gas turbines, and particularly relates to a coaxial staged combustor for a low-pollution combustion chamber of a gas fuel gas turbine. According to the coaxial staged combustor, air flow is accelerated by adopting a tapered rotational flow channel. A tapered mixing section is arranged behind each stage of rotational flow blades, so that the mixing between fuel and air is enhanced. First-stage fuel enters a hub fuel ring cavity from a fuel pipe through a fuel branch, second-stage fuel and third-stage fuel enter a rectification fuel ring cavity before entering the hub fuel ring cavity and enter the hub fuel ring cavity from four fan-shaped hub fuel ring cavity inlets of the hub fuel ring cavity after being rectified, it is guaranteed that the fuel flow in flow channels between blades of the same stage is uniform, and the premixing effect is enhanced. First-stage premixing-stage fuel is sprayed out from fuel spraying holes in a hub and enters a backflow area along with first-stage premixing-stage air along a first-stage outer hub, the fuel is prevented from being gathered at an outlet of a swirler, and the phenomena of tempering and combustor ablation are effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of combustion chambers of gas turbines, and in particular relates to a coaxial staged burner used in low-pollution combustion chambers of gas fuel gas turbines. Background technique [0002] Gas turbine pollutant emissions originate from combustion chemical reactions within the combustor. The main pollutants in the combustion chamber include carbon monoxide, nitrogen oxides, unburned hydrocarbons, soot, etc., among which nitrogen oxides are the most difficult pollutants to control. Since the thermodynamic mechanism plays a leading role in the formation of nitrogen oxides in the combustion chamber, controlling the combustion temperature is an effective means to reduce the emission of nitrogen oxides. Lean premixed combustion technology can make the combustion reaction in the combustion chamber proceed at a lower equivalence ratio, effectively control the combustion temperature, and reduce nitrogen oxide emis...

Claims

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Application Information

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IPC IPC(8): F23R3/28F23R3/38
CPCF23R3/286F23R3/38
Inventor 赵宁波孙继昊罗绍文杨洪磊李智明郑洪涛
Owner HARBIN ENG UNIV
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