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Nozzle with plasma exciters, nozzle array and burner

A plasma and exciter technology, which is applied to gas fuel burners, burners, combustion methods, etc., can solve problems such as easy oscillation and unstable combustion, improve accuracy and speed, reduce dwell time, and prevent return fire effect

Active Publication Date: 2016-08-17
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

However, since the main flame is stable at the low-velocity edge of the shear layer, periodic vortex shedding will occur near the low-velocity region of the shear layer, and oscillations will easily occur near the stable point, and combustion instability will easily occur when operating in non-design conditions

Method used

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  • Nozzle with plasma exciters, nozzle array and burner
  • Nozzle with plasma exciters, nozzle array and burner
  • Nozzle with plasma exciters, nozzle array and burner

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Embodiment Construction

[0033] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0034] The nozzle with plasma exciter according to the first embodiment of the present invention includes: an outer cylinder 10, an N-layer intermediate cylinder, an inner cylinder 11 and a high-voltage power supply 20, the inner wall of the outer cylinder, the intermediate cylinder Both the inner wall and the outer wall of the cylinder are covered with an insulating material layer 14, and M exposed electrodes 13 and M buried electrodes 16 extending in the axial direction are alternately arranged on the insulating material layer 14, wherein two adjacent exposed electrodes 13 and buried electrodes 16 are formed. A plasma exciter, the exposed electrode 13 and the buried electrode 16 are respectively connected to the high-voltage end 21 and the...

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Abstract

The invention provides a nozzle with plasma exciters. The nozzle with the plasma exciters comprises an outer cylinder, N layers of middle cylinders, an inner cylinder and a high-voltage power supply. The inner wall of the outer cylinder and the inner walls and the outer walls of the middle cylinders are each provided with one plasma exciter. The plasma exciters induce a mixture of fuel and air in an outer flow channel to do rotational motion. A mixture of fuel and air in an inner flow channel maintains axial motion and does not do rotational motion. Centrifugal force generated by rotational motion of fluid in the outer flow channel enables the fluid to expand in an outlet of the nozzle, the axial velocity of the fluid at the axis of the nozzle is decreased, and the burning stability is improved. Vortex breakdown and a strong backflow area are not generated at the outlet of the nozzle. The dwelling time of burning reactants in a high-temperature area is shortened, and generated NOx is reduced. Meanwhile, flow loss can be reduced, and backfire can be prevented. The output voltage of the high-voltage power supply can be automatically adjusted according to the burning state, the adjustment accuracy of the nozzle in the working state is improved, and the velocity of the nozzle in the working state is increased.

Description

technical field [0001] The invention relates to the technical field of combustion devices, in particular to a nozzle and a nozzle array with a plasma exciter, which are particularly suitable for various industrial burners such as gas turbines, boilers, chemical furnaces, etc. Background technique [0002] Gas turbines are widely used in electric power, aviation, petrochemical and other industries due to their small size and high output power. Due to the energy crisis and environmental degradation, the development of efficient and clean combustion chambers is urgently required, and the combustion chambers are required to have the characteristics of reliable ignition, stable combustion, high efficiency and low emissions. At present, the problem of environmental pollution in my country is very serious, and it is very urgent to develop clean combustion technology for gas turbines. Gas turbine manufacturers have developed a variety of clean combustion technologies, such as lean ...

Claims

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Application Information

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IPC IPC(8): F23D14/02F23D14/26F23D14/48F23D14/64
CPCF23D14/02F23D14/26F23D14/48F23D14/64F23D2203/007
Inventor 李钢张冬阳徐燕骥雷志军朱俊强
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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