CN114234239A - A combustion system and method based on metal-based particles and microwave synergy - Google Patents
A combustion system and method based on metal-based particles and microwave synergy Download PDFInfo
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- CN114234239A CN114234239A CN202111514197.7A CN202111514197A CN114234239A CN 114234239 A CN114234239 A CN 114234239A CN 202111514197 A CN202111514197 A CN 202111514197A CN 114234239 A CN114234239 A CN 114234239A
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- 239000002245 particle Substances 0.000 title claims abstract description 124
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 101
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 67
- 239000002184 metal Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000005284 excitation Effects 0.000 claims abstract description 14
- 238000009841 combustion method Methods 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003574 free electron Substances 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- -1 alkali metal salt Chemical class 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R5/00—Continuous combustion chambers using solid or pulverulent fuel
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Constitution Of High-Frequency Heating (AREA)
Abstract
本发明涉及一种基于金属基颗粒与微波协同的燃烧系统及方法，所述系统包括：颗粒储存输送装置，用于存储和输送金属基颗粒；燃烧室，与所述颗粒储存输送装置连接，所述金属基颗粒喷注至所述燃烧室内；微波发生器，与所述燃烧室连接，用于对所述燃烧室进行微波激励；控制器，与所述微波发生器连接，用于控制所述微波的输出参数。在金属基颗粒的作用下，能有效地加快火焰速度，提高燃烧强度，提高微波能量馈入效率。
The invention relates to a combustion system and method based on the coordination of metal-based particles and microwaves. The system comprises: a particle storage and conveying device for storing and conveying metal-based particles; The metal-based particles are injected into the combustion chamber; a microwave generator is connected to the combustion chamber for microwave excitation of the combustion chamber; a controller is connected to the microwave generator and used to control the combustion chamber Microwave output parameters. Under the action of metal-based particles, the flame speed can be effectively accelerated, the combustion intensity can be improved, and the microwave energy feeding efficiency can be improved.
Description
Technical Field
The invention relates to the technical field of engine combustion devices, in particular to a combustion system and a combustion method based on the synergy of metal-based particles and microwaves.
Background
With the continuous development of combustion device types, application scenes and application objects thereof are continuously widened, and multiple purposes and multiple application scenes put higher demands on the high efficiency of combustion. In some extreme cases, such as efficient combustion of plateau car engines, stable flame combustion of scramjet engines, and effective ignition under large background pressure, the above scenarios all put an urgent need for advanced auxiliary combustion devices.
Microwave-assisted combustion technology has proven to be a promising approach in many applications, enhancing flame intensity and accelerating combustion from a chemical reaction kinetics point of view by expanding the original plasma to increase plasma density. However, microwave-assisted combustion does not effectively address the need for severe operating conditions.
Disclosure of Invention
In view of the above, the present invention provides a combustion system and method based on coordination of metal-based particles and microwaves, wherein the metal-based particles are injected and microwave excitation matched with parameters of the metal-based particles is applied, so that microwave energy is strongly absorbed by the metal-based particles in a combustion area, a plasma is excited near the metal-based particles, and active groups in the plasma accelerate a combustion reaction process, thereby enhancing combustion intensity. Meanwhile, due to the large dielectric constant of the particles, large loss current can be generated on the surfaces of the particles, so that the surface temperature of the particles is increased, a plurality of combustion assisting areas are formed in flame, the flame speed is increased, and the microwave energy feeding efficiency is greatly improved.
In order to achieve the purpose, the invention provides the following scheme:
a combustion system based on the synergy of metal-based particles with microwaves, comprising:
a particle storage and transport device for storing and transporting the metal-based particles;
the combustion chamber is connected with the particle storage and conveying device, and the metal-based particles are injected into the combustion chamber;
the microwave generator is connected with the combustion chamber and is used for carrying out microwave excitation on the combustion chamber;
and the controller is connected with the microwave generator and is used for controlling the output parameters of the microwaves.
Preferably, the particle storage and conveying device is connected with the combustion chamber through a particle pipeline, and a particle valve is arranged on the particle pipeline;
the particle valve is connected with the controller, and the controller controls the flow and the flow rate of the metal-based particles through the particle valve.
Preferably, an entrance port is arranged on the combustion chamber, a baffle is arranged at the entrance port, and the baffle is sealed with the combustion chamber;
the microwave generator is connected with the second waveguide tube through a first waveguide tube, and the second waveguide tube is hermetically connected with the baffle;
the microwave generated by the microwave generator acts on the combustion chamber through the baffle plate.
Preferably, the microwave generator is any one of a solid state microwave source and a microwave magnetron or a combination of both.
Preferably, the material of the baffle has a low dielectric constant.
The invention also provides a combustion method based on the synergy of the metal-based particles and microwaves, which is suitable for the system, and the method comprises the following steps:
setting output parameters of a controller and the particle size of the metal-based particles based on the flame combustion state and the enhancement requirement;
conveying the metal-based particles with the set particle size to a combustion chamber, and starting a microwave generator to excite microwaves emitted in the combustion chamber;
the controller gradually adjusts the output parameters of the microwaves until the reflection power value of the microwaves in the combustion chamber is the lowest.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention relates to a combustion system and a method based on the synergy of metal-based particles and microwaves, wherein the system comprises: a particle storage and transport device for storing and transporting the metal-based particles; the combustion chamber is connected with the particle storage and conveying device, and the metal-based particles are injected into the combustion chamber; the microwave generator is connected with the combustion chamber and is used for carrying out microwave excitation on the combustion chamber; and the controller is connected with the microwave generator and is used for controlling the output parameters of the microwaves. Under the action of metal-based particles, the flame speed can be effectively accelerated, the combustion intensity is improved, and the microwave energy feed-in efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a combustion system based on the synergy of metal-based particles and microwaves according to the present invention;
FIG. 2 is a flow chart of a combustion method based on the synergy of metal-based particles and microwaves according to the present invention.
Description of the symbols: 1-particle storage and conveying device, 2-combustion chamber, 3-microwave generator, 4-controller, 11-particle pipeline, 12-particle valve, 21-entrance port, 22-baffle, 23-particle nozzle, 31-first waveguide and 32-second waveguide.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a combustion system and a combustion method based on coordination of metal-based particles and microwaves. Meanwhile, due to the large dielectric constant of the particles, large loss current can be generated on the surfaces of the particles, so that the surface temperature of the particles is increased, a plurality of combustion assisting areas are formed in flame, the flame speed is increased, and the microwave energy feeding efficiency is greatly improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
FIG. 1 is a schematic diagram of a combustion system based on the synergy of metal-based particles and microwaves according to the present invention. As shown in the figures, the present invention provides a combustion system based on the synergy of metal-based particles and microwaves, comprising: particle storage and delivery device 1, combustion chamber 2, microwave generator 3 and controller 4.
The particle storage and conveying device 1 is connected with the combustion chamber 2 through a particle pipeline 11, and a particle valve 12 is arranged on the particle pipeline 11; the particle valve 12 is connected to the controller 4, and the controller 4 controls the flow rate and the flow velocity of the metal-based particles through the particle valve 12. The particle pipeline 11 is sealed with the particle valve 12, the particle storage and conveying device 1 and the combustion chamber 2.
The particle valve 12 is a one-way valve.
The combustion chamber 2 is also internally provided with particle nozzles 23, the particle nozzles 23 are connected with the particle pipeline 11, the particle nozzles 23 spray the metal-based particles into the combustion chamber 2, and the number of the particle nozzles 23 is selected according to actual requirements.
Be provided with incident port 21 on the combustion chamber 2, incident port 21 department is provided with baffle 22, baffle 22 with combustion chamber 2 is sealed. In this embodiment, the material of the baffle 22 has a low dielectric constant, and specifically is high-purity quartz glass. The thickness of the baffle 22 is the same as the thickness of the combustion chamber 2.
The microwave generator 3 is connected with the second waveguide tube 32 through a first waveguide tube 31, and the second waveguide tube 32 is hermetically connected with the baffle plate 22; the microwave generated by the microwave generator 3 is applied to the combustion chamber 2 through the baffle 22. In this embodiment, the second waveguide 32 is in a horn shape, and the microwave generator 3 is either one of a solid microwave source and a microwave magnetron or a combination of both. The output parameters of the microwave generator 3 are as follows: the microwave excitation frequency range is 2-3 GHz, the microwave excitation mode comprises continuous excitation, discontinuous excitation and pulse excitation, the pulse width of the pulse excitation is 0-100 mus, and the pulse frequency is 0-100 kHz. The metal-based particle material comprises alkali metal salt, oxidized metal, pure metal, ceramic metal and a combination of the metal salt, the oxidized metal, the pure metal and the ceramic metal in proportion, and the shape of the metal-based particle comprises a sphere, a square and an irregular shape; the particle size of the metal-based particles is 1 to 100 μm.
The controller 4 is further connected with the microwave generator 3, and the controller 3 is used for controlling the output parameters of the microwaves.
The specific principle of the invention is as follows:
the high temperature of the flame ionizes the surface of the metal-based particles from free electrons, and the collision of the free electrons with neutral particles causes the absorption of microwave field energy, forming plasma nuclei on the surface of the metal-based particles. Meanwhile, the high dielectric constant characteristic of the metal-based particles can promote the absorption of microwave energy on the surfaces of the particles and improve the surface temperature of the particles. The two effects act together to generate a plurality of high-temperature points and discharge plasma points in the flame, and the high-temperature action can improve the chemical reaction speed of flame combustion and accelerate the physical processes such as fuel diffusion and the like; the discharge plasma has a large number of different high-energy active particles, and the active particle groups can promote the collision process of free electrons and neutral particles, promote the interaction process of microwaves and a plasma layer and improve the microwave energy absorption rate. The active groups contained in the discharge plasma can accelerate the combustion process from the perspective of chemical reaction kinetics, and the generated ion wind effect can accelerate the atomization and dissociation process of the fuel, improve the mutual diffusion efficiency of each reactant and greatly improve the combustion speed of the flame.
The traditional microwave-assisted combustion method can only couple microwave energy into the flame frontal surface, the interaction surface area and the interaction speed of the traditional microwave-assisted combustion method are lower than those of the traditional microwave-assisted combustion method, and the current microwave-assisted combustion methodThe combustion supporting effect generally enables the flame burning speed to be improved by about 20%, and the effect of improving the microwave power on the flame burning speed is not large. The invention can break through the original energy injection upper limit, utilizes the metal-based particles as energy carriers to directly or indirectly inject microwave energy to the periphery, surface and inside of the flame, greatly improves the injection upper limit of the microwave energy, and uses the metal-based particles of which the type is Fe in a real experiment3O4The median of the particle size is 70 μm, the microwave feed power is fixed at 200W, and the microwave frequency is 2380 MHz. Compared with the independent microwave combustion supporting effect, the microwave absorption power is improved from 20W to 105W, the efficiency is improved by about 5 times, the position of the flame combustion front and the discharge level around particles are greatly improved, and the flame combustion speed is greatly improved.
FIG. 2 is a flow chart of a combustion method based on the synergy of metal-based particles and microwaves according to the present invention. As shown in the figure, the present invention provides a combustion method based on the synergy of metal-based particles and microwaves, which is suitable for the system, specifically, the method comprises:
and S1, setting the output parameters of the controller and the particle size of the metal-based particles based on the flame combustion state and the enhancement requirement.
And S2, conveying the metal-based particles with the set particle size to the combustion chamber, and starting the microwave generator to excite the microwave emitted in the combustion chamber.
And S3, the controller gradually adjusts the output parameters of the microwave until the reflection power value of the microwave in the combustion chamber is the lowest.
In the operating state, in the combustion chamber, the metal-based particles moving in a fixed mode form a quasi-steady state distributed along with the particle sizes and the particle types, namely particle groups tend to be of a single type and size in different regions, and the excitation frequency of the microwave generator for each region is kept constant, and only the excitation power is changed.
The position of the incident port is horizontally aligned with the inner wall of the combustion chamber, and the incident port, the baffle and the combustion chamber are sealed, so that the auxiliary combustion effect on the flame in the combustion chamber can be realized under the condition of not changing the flow field of the original combustion chamber.
The invention can be connected with the existing combustion system for reconstruction on the premise of not changing the internal structure of the combustion chamber, and the applicable combustion chamber has wide types.
According to the invention, by injecting the metal-based particles and applying microwave excitation matched with the parameters of the metal-based particles, the microwave energy is strongly absorbed by the metal-based particles in the combustion area, plasma is excited near the metal-based particles, active groups in the plasma accelerate the combustion reaction process, and the combustion intensity is improved. Meanwhile, due to the large dielectric constant of the metal-based particles, large loss current can be generated on the surfaces of the metal-based particles, so that the surface temperature of the particles is increased, a plurality of combustion assisting areas are formed in flame, the flame speed is increased, the microwave energy feeding efficiency is greatly improved, and the auxiliary combustion effect higher than the sum of the flame speed and the microwave energy feeding efficiency is achieved.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The method disclosed by the embodiment corresponds to the system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the system part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist understanding of the system and its core concepts; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
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|---|---|---|---|---|
| JPH08200190A (en) * | 1995-01-18 | 1996-08-06 | Technova:Kk | Internal combustion engine ignition device |
| CN1516994A (en) * | 2001-04-27 | 2004-07-28 | 戴维系统技术公司 | Method for plasma-catalytic conversion of fuels that can be used in internal combustion engine or gas turbine into synthetic gas and plasma-catalytic converter used for same |
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| CN1842488A (en) * | 2003-06-26 | 2006-10-04 | 鲍尔根国际有限公司 | Reformate assisted combustion |
| CN201401251Y (en) * | 2009-03-27 | 2010-02-10 | 昆明理工大学 | High voltage electric plasma ceramic internal combustion engine |
| JP2011208647A (en) * | 2005-09-20 | 2011-10-20 | Imagineering Inc | Ignition device, internal combustion engine, ignition plug, and plasma device |
| CN103216317A (en) * | 2013-04-16 | 2013-07-24 | 哈尔滨工业大学 | Supersonic combustion method actuated by combination plasma |
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| CN112377341A (en) * | 2020-09-03 | 2021-02-19 | 盐城工学院 | Microwave plasma combustion-supporting device based on surface wave mode |
| CN113587084A (en) * | 2021-08-04 | 2021-11-02 | 大连理工大学 | Device for enhancing combustion by utilizing microwave plasma torch |
-
2021
- 2021-12-13 CN CN202111514197.7A patent/CN114234239A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08200190A (en) * | 1995-01-18 | 1996-08-06 | Technova:Kk | Internal combustion engine ignition device |
| CN1516994A (en) * | 2001-04-27 | 2004-07-28 | 戴维系统技术公司 | Method for plasma-catalytic conversion of fuels that can be used in internal combustion engine or gas turbine into synthetic gas and plasma-catalytic converter used for same |
| CN1652889A (en) * | 2002-05-08 | 2005-08-10 | 达纳公司 | Plasma-assisted sintering |
| CN1652893A (en) * | 2002-05-08 | 2005-08-10 | 达纳公司 | Plasma-assisted process in production line |
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| JP2011208647A (en) * | 2005-09-20 | 2011-10-20 | Imagineering Inc | Ignition device, internal combustion engine, ignition plug, and plasma device |
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