CN112383997A - High-power microwave plasma pulverized coal cracking device - Google Patents
High-power microwave plasma pulverized coal cracking device Download PDFInfo
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- CN112383997A CN112383997A CN202011067181.1A CN202011067181A CN112383997A CN 112383997 A CN112383997 A CN 112383997A CN 202011067181 A CN202011067181 A CN 202011067181A CN 112383997 A CN112383997 A CN 112383997A
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- 239000003245 coal Substances 0.000 title claims abstract description 43
- 238000005336 cracking Methods 0.000 title claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 42
- 239000010453 quartz Substances 0.000 claims abstract description 36
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000000843 powder Substances 0.000 claims abstract description 24
- 238000000227 grinding Methods 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims description 22
- 239000002184 metal Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 6
- 230000005284 excitation Effects 0.000 abstract description 6
- 210000002381 plasma Anatomy 0.000 description 61
- 239000007789 gas Substances 0.000 description 23
- 230000005684 electric field Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 10
- 238000009826 distribution Methods 0.000 description 8
- 238000004088 simulation Methods 0.000 description 8
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 7
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 239000005997 Calcium carbide Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J19/12—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electromagnetic waves
- B01J19/122—Incoherent waves
- B01J19/126—Microwaves
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
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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
- H05H1/461—Microwave discharges
- H05H1/4622—Microwave discharges using waveguides
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- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention relates to the field of plasma equipment, in particular to a high-power microwave plasma coal powder cracking device, which solves the problem of coal powder cracking caused by small size and low power of plasma in the prior art. The invention comprises a coal powder grinding device, a coal powder input device, a plasma generating device, a cracked gas processing device and a microwave cavity; the axis position of the microwave cavity is superposed with the axis of the reaction cavity; the microwave generating device is arranged around the microwave cavity; the number of the microwave generating devices is not less than three; the microwave cavity is a hollow cylindrical multi-cavity. According to the invention, a high-power microwave plasma device is used as a coal powder cracking reaction device, a plurality of microwave generating devices are arranged at different distances and in a staggered manner, and electromagnetic waves are uniformly and intensively bound at the central position of a quartz tube, so that the excitation of the high-power large-size coal powder plasma is realized; the invention has simple structure, high excitation efficiency and low cost, and meets the requirement of industrialization on a large scale.
Description
Technical Field
The invention relates to the field of plasma equipment, in particular to a high-power microwave plasma pulverized coal cracking device.
Background
The main production processes of industrial acetylene include a calcium carbide method and a hydrocarbon cracking method, wherein the calcium carbide method, namely a wet calcium carbide method, generates a large amount of waste water and carbide slag when acetylene is generated, and has high energy consumption and high pollution; the resource consumption of acetylene obtained by cracking olefin with petroleum is large and is not a long-term measure.
In the cracking method, the application of plasma cracking coal powder in the industrial acetylene production is more and more extensive, and the plasma torch has the following characteristics: 1) the plasma has extremely high energy density, temperature and extremely fast reaction time, can thoroughly decompose various organic matters into micromolecular combustible gas, has small occupied area, can achieve large treatment capacity, and can realize fast start and stop; 2) because fuel combustion does not exist, the heat source is generated without oxidant, and compared with the conventional heat treatment process, the method has the advantages of much less smoke generated, easy treatment and low cost. But the problems of insufficient high voltage, weak current stability, complex power supply control system and limited service life of high power exist.
And the following defects exist in the production process, which causes the blockage of the production quantity:
1. most microwave plasmas realize plasmas in a waveguide compression or waveguide mode, the diameter of the plasmas is small, the diameter of the plasmas is only 3-4cm under 2450MHz, the microwave action area is short, and the maximum diameter of the plasmas is 5cm under the action of microwaves;
2. the microwave plasma generator forms plasma under a single mold cavity, so that the area of a plasma region is small, and the energy utilization rate is low;
3. the microwave plasma generator cannot radiate heat to the reaction cavity through self airflow due to low ventilation volume, so that high external heat radiation capacity is required. The device cannot realize large-scale gas treatment or large-scale plasma treatment application.
There is a need for a new pulverized coal cracking apparatus that can solve the above problems.
Disclosure of Invention
The invention provides a high-power microwave plasma coal powder cracking device, which solves the problem of coal powder cracking caused by small size and low power of plasma in the prior art.
The technical scheme of the invention is realized as follows: a high-power microwave plasma coal powder cracking device comprises a coal powder grinding device, a coal powder input device, a plasma generating device and a cracking gas treatment device; the plasma generating device comprises a plasma ignition device, a microwave generating device, a waveguide, a reaction cavity for exciting gas into plasma, and an air inlet for introducing coal powder into the reaction cavity; the microwave cavity is sleeved outside the reaction cavity; the axis position of the microwave cavity is superposed with the axis of the reaction cavity; the microwave generating device is arranged around the microwave cavity in a staggered manner at different distances and high places through the waveguide; the number of the microwave generating devices is not less than three; the microwave cavity is a hollow cylindrical multi-cavity; the ignition device and the gas inlet are arranged at the lower end of the reaction cavity; the microwave plasma also comprises a combustion-supporting gas input port.
Furthermore, the electromagnetic waves at the center of the reaction cavity are uniformly and intensively distributed; the microwave cavity and the waveguide positions are simulated and optimized by a finite element method.
Further, the microwave cavity is a metallic microwave cavity for concentrating microwave energy.
Furthermore, the reaction cavity is made of a material with small electromagnetic loss and high temperature resistance.
Further, the reaction chamber is a quartz tube, a cylindrical metal tube is further sleeved outside the quartz tube, the diameter of the metal tube is larger than that of the quartz tube, and the height of the metal tube is consistent with that of the quartz tube.
Preferably, the reaction chambers may be cascaded, in particular with the upper end of a quartz tube being coupled to the lower end of another quartz tube.
Further, the microwave generators are uniformly distributed at the longitudinal section of the quartz tube.
Further, the microwave generating device and the waveguide can be three groups, four groups or five groups.
The invention discloses a high-power microwave plasma pulverized coal cracking device, which is characterized in that a high-power microwave plasma device is used as a pulverized coal cracking reaction device, a plurality of microwave generating devices are arranged at different distances and in a staggered manner, and electromagnetic waves are uniformly and intensively bound at the central position of a quartz tube, so that the excitation of a high-power large-size pulverized coal plasma is realized; the invention has simple structure, high excitation efficiency and low cost, and meets the requirement of industrialization on a large scale; the invention can be cascaded to realize effective superposition of power.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1: the system module of the invention is shown schematically;
FIG. 2: the structure schematic diagram of the four microwave sources;
FIG. 3: a simulation schematic diagram of four paths of microwave sources;
FIG. 4: a simulation schematic diagram of three paths of microwave sources;
FIG. 5: a simulation schematic diagram of five paths of microwave sources;
FIG. 6: a cascade schematic of the invention;
wherein: 10. a feed inlet; 20. a pulverized coal grinding device; 30. a pulverized coal input device; 40. a plasma generating device; 41. a microwave cavity; 42. a waveguide; 43. a microwave generating device; 44. an air inlet; 45. a plasma ignition device; 46. a reaction chamber; 47. a combustion supporting gas input port; 48. a circular metal tube; 50. a cracked gas treatment unit; 60. a harmless drain 60.
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.
As shown in fig. 1, the schematic structural diagram of the present invention shows that the present invention discloses a high-power microwave plasma coal powder cracking device, which comprises a coal powder grinding device 20, a coal powder input device 30, a plasma generating device 4140, and a cracking gas processing device 50; the plasma generating device 4140 comprises a plasma ignition device 45, a microwave generating device 43, a waveguide 42, a reaction cavity 46 for exciting gas into plasma, and an air inlet 44 for introducing pulverized coal into the reaction cavity 46; also comprises a microwave cavity sleeved outside the reaction cavity 46; the axis position of the microwave cavity is superposed with the axis of the reaction cavity 46; the microwave generating devices 43 are arranged around the microwave cavity in a staggered manner at different distances through the waveguide 42; the number of the microwave generating devices 43 is not less than three; the microwave cavity is a hollow cylindrical multi-cavity; the ignition device and the air inlet 44 are arranged at the lower end of the reaction cavity 46; the microwave plasma also includes a combustion supporting gas inlet 47.
Further, the electromagnetic waves are uniformly and intensively distributed at the center of the reaction cavity 46; the microwave cavity and waveguide 42 positions are simulated and optimized by finite element method.
And (3) simulation process:
a. variables in the optimization process, such as the Z-axis coordinates of the four waveguides 42 and the radius of the metal cylindrical cavity, are defined, and the electric field distribution can be optimized by changing the numerical values;
b. constructing a geometric model: four metal rectangular BJ26 waveguides 42, metal cylindrical cavities, metal tubes and quartz tubes;
c. creating a definition: assigning actual meaning to each domain and boundary;
d. adding materials: giving each cavity and boundary different material properties;
e. defining physical field, adding four microwave source feed-in ports;
f. setting a parametric scan: writing the variation range of the optimizable variable, calculating all permutation and combination through comsol, and selecting the parameter value when the electric field distribution is optimized;
g. and (4) dividing a grid, running analysis, and obtaining an optimal result according to the electric field distribution diagram and the S11 value.
Further, the microwave cavity is a metallic microwave cavity for concentrating microwave energy. Further, the reaction chamber 46 is made of a material with low electromagnetic loss and high temperature resistance. Further, the reaction chamber 46 is a quartz tube, and a cylindrical metal tube is further sleeved outside the quartz tube, wherein the diameter of the metal tube is larger than that of the quartz tube, and the height of the metal tube is consistent with that of the quartz tube.
Preferably, the reaction chambers 46 may be cascaded, in particular with the upper end of a quartz tube being coupled to the lower end of another quartz tube. The plasma generating device 4140 is composed of a plurality of cavities, the rectangular waveguide 42 inputs microwaves into the microwave cavity, the plasmas are confined in the quartz tube reaction cavity 46 and are isolated from the microwave cavity by the quartz tube, the electromagnetic waves are inhibited from radiating outwards from an opening caused by the quartz tube by the metal tube isolation cavity, the microwave energy is concentrated, the stability of a plasma torch is facilitated, the microwave energy can be efficiently converted into the microwave plasmas by the multi-cavity structural design, the cascade connection of the devices is realized, and the two devices are cascaded by the connection mode of the quartz tubes, so that the effective superposition of the power is realized.
Further, the microwave generators are uniformly distributed at the longitudinal section of the quartz tube.
As shown in a schematic diagram of a system module according to the present invention, in the using process, the coal powder is ground into coal powder by the coal powder grinding device 20, and the coal powder enters the plasma generating device 4140 through the air duct. Under 2450MHz, the microwave power can reach 4-12kW, microwave energy is fed into the multiple mold cavities, the microwave energy is focused in the multiple mold cavities through calculation design, and high-power microwave plasma is generated through an ignition device. The treatment reaction zone is a quartz tube, is isolated from the microwave cavity, and is filled with combustion-supporting gas hydrogen from a combustion-supporting port, so that the heating efficiency of the hydrogen plasma is high under the high-temperature condition, the temperature of the plasma torch is greatly increased, and an ultrahigh-temperature heat source is generated. The cracking reaction is carried out in the ultra-high temperature reaction environment, various gases such as acetylene, ethylene and the like and solid particles are generated and discharged from an outlet. Because the temperature of the pyrolysis gas generated by the reaction exceeds 1500K, the pyrolysis gas discharged from the outlet is quenched to prevent acetylene decomposition, and then gas-solid separation is carried out by a dust removal technology. Finally, various gases in the cracked gas are separated by a purification technology to obtain acetylene with higher purity.
The plasma generator 4140 may be three, four or five groups. Plasma electron density, electron temperature and gas temperature all increase with increasing microwave input power. The increase of the microwave power can accelerate the collision reaction in the plasma, thereby leading to the increase of the electron density generation speed and providing more heat sources for heating the gas. The multiple inputs greatly improve the quality of the plasma torch within the reaction chamber 46.
Four microwave sources:
the invention consists of four BJ26 waveguides 42, a metal cylindrical cavity, a metal tube and a quartz tube. The four rectangular waveguides 42 are embedded on the wall of the metal cylinder, the quartz tube penetrates through the center of the cylinder cavity, and the metal tube covers the outer layer of the quartz tube to separate the cylinder cavity from the quartz tube; the method adopts the finite element method-based multi-physical field simulation software COMSOL5.4 to carry out geometric modeling and creation definition, endows each domain and boundary with actual significance, sets material properties, defines related physical fields and divides grids, and carries out simulation and numerical analysis.
The four-way plasma structure is designed, microwaves are input by the four waveguide 42 ports with certain power, the microwave power is effectively increased, the electron density, the electron temperature and the gas temperature of the plasma are increased along with the increase of the microwave input power, and meanwhile, the collision reaction in the plasma is accelerated, so that the electron density generation speed is accelerated, and more heat sources are provided for heating the gas.
After microwave is input by the ports of the four waveguides 42 with certain power, an electric field distribution diagram in the cylindrical cavity is observed, and the geometric dimension of the cylindrical cavity and the corresponding positions of the four waveguides 42 and the bottom of the cylindrical cavity are continuously changed: specifically, the method comprises the following steps:
when the coordinates z =0 of the four microwave sources, namely the four microwave sources are parallel, the four microwave sources are positioned in the middle of the microwave cavity to feed microwaves, and at the moment, the electric field distribution in the microwave cavity cannot be concentrated in the quartz tube in the microwave cavity, so that the four microwave sources are distributed in a staggered manner, and the purpose of concentrating the electric field at the circle center is achieved.
When three microwave sources are located on the same Z plane, two microwave sources are located on the same Z plane, and none of the microwave sources are located on the same Z plane, the Z-axis coordinates of the four microwave sources are respectively set as Z1, Z2, Z3 and Z4, a parameterized scanning list is added, a Z coordinate dislocation range is given, the optimal electric field distribution is selected through different arrangement combinations, and when none of the four microwave sources is parallel, the electric field is favorably concentrated at the circle center.
Increasing power, and determining the optimal electric field distribution as shown by the graph by simulating different staggered distances of the four microwave sources; furthermore, when the z-axis coordinate of each microwave source is fixed and unchanged, the maximum electric field intensity and the best focusing effect can be obtained by simulating electric field patterns under different metal cylindrical cavity radiuses.
And then constantly optimize electric field focusing effect, form powerful microwave plasma torch, finally confirm that cylinder cavity radius is 115mm, four metal rectangle BJ26 wave guides 42 are wide for 84.6mm, high for 43.2mm, the depth is 205mm apart from cylinder cavity outer most ring distance, four metal rectangle wave guides 42 rotate 90 degrees and distribute in proper order in the cylinder cavity wall, its distance apart from the top is respectively: 18.4mm, 33.4mm, 28.4mm and 23.4mm, and the heights are staggered.
As shown in the simulation diagram of the first embodiment of fig. 2, the temperature in the quartz tube is concentrated and uniform.
Three and five microwave sources:
on the basis of four microwave sources, the structures of the plasma generators of three microwave sources and five microwave sources are respectively, and the design and the size of the rest parts of the device are not changed except the number and the positions of the waveguides 42; the simulation optimization process is the same as the steps of the plasma generators of the four microwave sources, the comsol is used for carrying out optimization simulation analysis on the plasma generators of the three microwave sources and the five microwave sources, and after the optimal optimization parameters are respectively determined, the optimal electric field distribution diagram is obtained; the maximum electric field of the plasma generator of the three-way microwave source is 2.12 x 103The plasma generator of V/m, five-path microwave source is difficult to focus the highest electric field energy at the center of a circleAnd the maximum electric field of the plasma generator of the four microwave sources is 2.49 x 103V/m, and perfectly concentrates electric field energy in a certain range.
Plasma electron density, electron temperature and gas temperature all increase with increasing microwave input power. The increase of the microwave power can accelerate the collision reaction in the plasma, thereby leading the electron density generation speed to be accelerated, simultaneously providing more heat sources for heating the gas, and greatly improving the quality of the plasma torch in the reaction cavity 46 by multi-path input.
The invention discloses a high-power microwave plasma pulverized coal cracking device, which realizes the excitation of a large-power large-size pulverized coal plasma by arranging a plurality of microwave generating devices 43 at different distances and in staggered heights and uniformly and intensively binding electromagnetic waves at the central position of a quartz tube; the invention has simple structure, high excitation efficiency and low cost, and meets the requirement of industrialization on a large scale; the invention can be cascaded to realize effective superposition of power.
It is understood that various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention, and it is intended to cover in the appended claims all such changes and modifications.
Claims (8)
1. A high-power microwave plasma coal powder cracking device comprises a coal powder grinding device, a coal powder input device, a plasma generating device and a cracking gas treatment device; the plasma generating device comprises a plasma ignition device, a microwave generating device, a waveguide, a reaction cavity for exciting gas into plasma, and an air inlet for introducing coal powder into the reaction cavity; the method is characterized in that:
the microwave cavity is sleeved outside the reaction cavity; the axis position of the microwave cavity is superposed with the axis of the reaction cavity; the microwave generating device is arranged around the microwave cavity in a staggered manner at different distances and high places through the waveguide;
the number of the microwave generating devices is not less than three;
the microwave cavity is a hollow cylindrical multi-cavity;
the ignition device and the gas inlet are arranged at the lower end of the reaction cavity;
the microwave plasma also comprises a combustion-supporting gas input port.
2. The high-power microwave plasma pulverized coal cracking device according to claim 1, characterized in that: the electromagnetic waves at the center of the reaction cavity are uniformly and intensively distributed.
3. The high-power microwave plasma pulverized coal cracking device according to claim 2, characterized in that: the microwave cavity is a metallic microwave cavity for concentrating microwave energy.
4. The high-power microwave plasma pulverized coal cracking device according to claim 3, characterized in that: the reaction cavity is made of a material with small electromagnetic loss and high temperature resistance.
5. The high-power microwave plasma pulverized coal cracking device according to claim 4, characterized in that: the reaction chamber is a quartz tube, a cylindrical metal tube is further sleeved outside the quartz tube, the diameter of the metal tube is larger than that of the quartz tube, and the height of the metal tube is consistent with that of the quartz tube.
6. The high-power microwave plasma pulverized coal cracking device according to claim 5, characterized in that: the reaction chambers can be cascaded, and particularly, the upper end of one quartz tube is connected with the lower end of another quartz tube.
7. The high-power microwave plasma pulverized coal cracking device according to any one of claims 1 to 6, characterized in that: the microwave generators are uniformly distributed at the longitudinal section of the quartz tube.
8. The high-power microwave plasma pulverized coal cracking device according to claim 7, characterized in that: the microwave generating device and the waveguide can be three groups, four groups or five groups.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112689376A (en) * | 2021-03-15 | 2021-04-20 | 四川大学 | Microwave plasma jet excitation device adopting piezoelectric material |
| CN113139314A (en) * | 2021-04-29 | 2021-07-20 | 四川大学 | Heat source numerical simulation method for laser additive manufacturing process |
| CN115646126A (en) * | 2022-11-10 | 2023-01-31 | 杭州慕皓新能源技术有限公司 | Microwave device for cracking and converting gas |
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