Method for enabling laser to induce metal target plasma to achieve ignition of flammable gas and device for achieving same

A plasma and laser-induced technology, which is applied in the fields of combustion ignition, combustion method, lighting and heating equipment, etc., can solve the problems of low ignition success rate, high minimum ignition energy, and high laser output energy requirements

Inactive Publication Date: 2013-10-09
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problems of high minimum ignition energy, low ignition success rate, and high requirements on laser output energy required by the existing laser direct breakdown gas-induced plasma ignition method, thereby providing a laser-induced metal target plasma to achieve Method for igniting combustible gas and device for realizing the method

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  • Method for enabling laser to induce metal target plasma to achieve ignition of flammable gas and device for achieving same

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specific Embodiment approach 1

[0020] Specific implementation mode 1. Combination figure 1 Describe this specific embodiment, a kind of method that laser induces metal target plasma to realize combustible gas ignition, it is realized by the following steps:

[0021] Step 1. Pass the premixed combustible gas in the premixed tank into the quartz tube;

[0022] Step 2. Place a metal target on the side above the nozzle of the quartz tube; use a Nd:YAG laser to emit a laser beam, and use a focusing device to focus the laser beam on the surface of the metal target, induce the metal target to generate plasma, and place the quartz tube nozzle on the surface of the metal target. The premixed combustible gas at the place ignites.

[0023] In the above process, an energy meter is also used to measure the reflected energy of the laser beam passing through the beam splitter, so as to obtain the minimum ignition energy.

[0024] The gas in step 1 can also be a mixed gas of methane and air, or N 2 , O 2 and CH 4 of m...

specific Embodiment approach 2

[0026] Specific Embodiment 2. A device for realizing the ignition of combustible gas by laser-induced metal target plasma described in Specific Embodiment 1, which includes N 2 Cylinder 4, O 2 Cylinder 5, CH 4 Gas bottle 6, premix tank 7, metal target 8, quartz tube 9, Nd:YAG laser 10, reflector 11, beam splitter 12 and lens 13;

[0027] The N 2 The gas outlet of gas cylinder 4 and the N of premix tank 7 2 The air inlet is connected; the O 2 The gas outlet of cylinder 4 and the O of premix tank 7 2 Inlet communication; the CH 4 The gas outlet of gas cylinder 4 and the CH of premix tank 7 4 The air inlet is communicated; the air outlet of the premix tank 7 is communicated with the end of the quartz tube 9; the metal target 8 is arranged on the side above the mouth of the quartz tube 9;

[0028] The laser light that Nd:YAG laser device 10 produces is reflected to spectroscope 12 by reflector 11, is divided into reflected light and transmitted light through spectroscope 12...

specific Embodiment approach 3

[0029] Embodiment 3. The difference between this embodiment and the device for igniting combustible gas by laser-induced metal target plasma described in Embodiment 2 is that it also includes a dual-channel energy meter 2, and the No. 1 reflected light is incident on the Probe for dual channel energy meter 2.

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Abstract

The invention provides a method for enabling laser to induce metal target plasma to achieve ignition of flammable gas and a device for achieving the method, and relates to the method for achieving ignition of the flammable gas and the device for achieving the method. The method and the device for achieving the method solve the problem that an existing method for enabling laser to directly breakdown the gas to induce the plasma to conduct ignition is high in minimum ignition energy, low in ignition success rate and high in requirement for laser output energy. The method includes the steps of enabling premixed gas to enter a quartz tube, emitting a laser bundle through a Nd:YAG laser, focusing the bundle on the surface of a metal target, inducing the metal target to produce the plasma and igniting the premixed gas in the quartz tube. According to the device, the gas outlet of a premixing tank is communicated with the tail end of the quartz tube, the metal target is arranged on the side face, above the tube opening of the quartz tube, of the quartz tube, laser produced by the Nd:YAG laser is reflected to a spectroscope through a mirror and divided into reflected light and transmission light through the spectroscope, the first reflected light is emitted outward, and the transmission light penetrates through a lens and is focused on the metal target through the lens. The method and the device are suitable for situations where flammable gas ignition is needed.

Description

technical field [0001] The invention relates to a method for realizing the ignition of combustible gas and a device for realizing the method. Background technique [0002] In order to improve the success rate of lean-burn ignition in traditional spark plug ignition, it is necessary to increase the discharge voltage of the spark plug, which greatly shortens the life of the spark plug, and the spark plug is inside the combustion system, so it is not easy to replace. Although the direct laser breakdown gas-induced plasma ignition method can solve the above problems to a certain extent, the required minimum ignition energy is high, and it is difficult to realize the miniaturization of the laser, which is not conducive to the application in automobiles or other small combustion systems. Contents of the invention [0003] The present invention aims to solve the problems of high minimum ignition energy, low ignition success rate, and high requirements on laser output energy requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23Q13/00
Inventor 于欣李晓晖刘倡于杨彭江波樊荣伟陈德应
Owner HARBIN INST OF TECH
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