CN113365404B - Dielectric barrier discharge plasma auxiliary coal combustion generating device - Google Patents
Dielectric barrier discharge plasma auxiliary coal combustion generating device Download PDFInfo
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- CN113365404B CN113365404B CN202110441243.9A CN202110441243A CN113365404B CN 113365404 B CN113365404 B CN 113365404B CN 202110441243 A CN202110441243 A CN 202110441243A CN 113365404 B CN113365404 B CN 113365404B
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- combustion
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 62
- 239000003245 coal Substances 0.000 title claims abstract description 44
- 230000004888 barrier function Effects 0.000 title claims abstract description 18
- 239000000463 material Substances 0.000 claims description 7
- 238000010292 electrical insulation Methods 0.000 claims description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims 6
- 210000002381 plasma Anatomy 0.000 abstract description 51
- 239000002245 particle Substances 0.000 abstract description 8
- 230000001105 regulatory effect Effects 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000002679 ablation Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 239000010883 coal ash Substances 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 238000009832 plasma treatment Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- H05H1/2406—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
Abstract
The invention discloses a dielectric barrier discharge plasma auxiliary coal combustion generating device which comprises an outer shell, a ground electrode lead and a high-voltage electrode lead, wherein the outer shell is hollow, a first porous screen electrode is arranged on the upper end face of the outer shell, a second porous screen electrode is arranged on the lower end face of the outer shell, the ground electrode lead is fixed through a built-in nut and embedded on the right side above the outer shell, the first porous screen electrode is connected with the ground electrode lead and connected to a high-voltage alternating current power supply grounding end, the high-voltage electrode lead is fixed through the built-in nut and embedded on the bottom of the outer shell, and the second porous screen electrode is connected with the high-voltage electrode lead and connected to the high-voltage alternating current power supply terminal. The porous screen electrode is adopted to bear the functions of the gas inlet and the gas outlet, and stable and uniform plasmas can be generated by combining a uniform gas flow mode; the chemical balance of the combustion system is influenced by high-energy particles and active groups in the plasma, and the combustion process of the system is regulated and controlled.
Description
Technical Field
The invention relates to the technical field of discharge plasma auxiliary combustion application, in particular to a dielectric barrier discharge plasma auxiliary coal combustion generating device.
Background
DBD plasma enhanced combustion is a process in which a large number of reactive atoms and radicals are generated by a plasma reaction zone to influence the chemical equilibrium of the combustion process to accelerate the combustion process. Nowadays, more and more researchers are focusing on the development prospect of plasma combustion technology.
The bottleneck problem of the current plasma combustion-supporting technology mainly focuses on stable maintenance of reliable and uniform discharge, effective adjustment of the types and the concentrations of high-energy active particles, discharge plasma with corresponding parameters obtained according to actual requirements, and the like. Because the bond energy of the carbon-oxygen, carbon-carbon, carbon-hydrogen and other compounds in the coal is larger, the initial voltage of discharge is higher, arc discharge is easy to occur, the temperature of a discharge contact is overhigh, and the electrode ablation and other limitations are caused; along with the advancement of the combustion process of coal, the change of the residual mass of the coal, the stacking mode and other factors can also influence the chemical reaction process of the combustion, such as the combustion temperature, the rate, the product change and the like.
The research foundation of the existing plasma auxiliary coal combustion mainly comprises:
in the directional spin plasma combustion-supporting system of the retrieved grant publication No. CN103953474B, a plasma combustion-supporting device which can generate a large area and has good uniformity is provided, a nanosecond pulse power supply is adopted as a power supply, and a pulse modulated high-voltage alternating current power supply is adopted to generate plasma.
The "plasma pulverized coal burner" of the retrieved grant publication number CN103277792B provides an application example of a plasma coal combustion-supporting technology, which utilizes plasma to heat water vapor and pulverized coal, so that the combustion efficiency is improved. The invention utilizes active particles in DBD plasma to regulate the combustion process, and has essential difference in principle.
In summary, the existing plasma combustion-supporting technology has problems in the coal field, the power supply application and the cost estimation, and the processed object is only coal dust, so that the factors limit the wide application of the existing plasma combustion-supporting technology and the device to a great extent. Therefore, how to provide a dielectric barrier discharge plasma-assisted coal combustion generating device is a problem to be solved by those skilled in the art.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the invention aims at providing a generating device for assisting coal combustion by dielectric barrier discharge plasma, which saves the expensive cost of vacuum equipment, adopts a porous screen electrode to bear the functions of gas inlet and gas outlet, and can generate stable and uniform plasma by combining a uniform gas flow mode; the chemical balance of the combustion system is influenced by using high-energy particles and active groups in the plasma, the combustion process of the system is regulated and controlled, and the effect is remarkable.
The device is characterized by comprising an outer shell, a ground electrode lead and a high-voltage electrode lead, wherein the outer shell is hollow, a first porous screen electrode is arranged on the upper end face of the outer shell, a second porous screen electrode is arranged on the lower end face of the outer shell, the ground electrode lead is fixed through a built-in nut and embedded on the right side above the outer shell, the first porous screen electrode is connected with the ground electrode lead and connected with a high-voltage alternating-current power supply grounding end, the high-voltage electrode lead is fixed through a built-in nut and embedded at the bottom of the outer shell, and the second porous screen electrode is connected with the ground electrode lead and connected with a high-voltage alternating-current power supply terminal.
Preferably, the first porous screen electrode and the second porous screen electrode are arranged in parallel in the outer housing.
Preferably, the first porous screen electrode and the second porous screen electrode are both provided with buckle nuts, and the outer shell is provided with clamping grooves matched with the buckle nuts, so that the first porous screen electrode and the second porous screen electrode form a stable buckle fixing structure after being embedded and installed with the outer shell, and the first porous screen electrode and the second porous screen electrode are easy to detach and replace.
Preferably, the outer shell is made of an electrical insulating and high temperature resistant material, including polytetrafluoroethylene and ceramic.
Preferably, the diameters of the holes of the first porous screen electrode and the second porous screen electrode are 3.0-5.0mm, the thicknesses of the holes of the first porous screen electrode and the second porous screen electrode are 0.8-1.5mm, the first porous screen electrode and the second porous screen electrode are of porous screen structures, the gas flowing functions of a gas inlet and a gas outlet are directly realized, and coal ash and the like generated by full combustion after plasma treatment directly leak into the bottom through the holes of the second porous screen electrode.
Preferably, the high-voltage alternating current power supply is a pulse modulation sinusoidal alternating current power supply, the power of the high-voltage alternating current power supply is 800-2000W, the voltage peak-peak value is 0-60kV, the alternating current frequency is 5-35kHz, the modulation pulse frequency is 10-1000Hz, the duty ratio is 1-100% controllable, the contact temperature is prevented from being too high due to arc discharge, and electrode ablation is prevented.
Preferably, the first porous screen electrode, the second porous screen electrode and the outer shell form a gas-permeable discharge combustion chamber.
Preferably, the block coal is placed in the discharge combustion chamber to perform DBD discharge and combustion.
Compared with the prior art, the invention has the beneficial effects that:
(1) The generating device for assisting coal combustion by the dielectric barrier discharge plasma provided by the invention has the advantages that the DBD plasma generating unit is formed by the screen electrode and the coal, the structure is simple and the conception is exquisite, the first porous screen electrode and the second porous screen electrode can directly realize the gas circulation functions of the gas inlet and the gas outlet, the processing is carried out at normal temperature and normal pressure, the high cost of vacuum equipment can be saved, and the uniformity of generated plasmas is better along with the adjustment of parameters such as voltage, frequency, modulation pulse frequency and the like in the discharging process;
(2) The screen electrode DBD is used for discharging, the discharging uniformity is good, and the high-efficiency, uniform and active particle-rich atmospheric pressure DBD plasma can be generated;
(3) The first porous screen electrode and the second porous screen electrode can be fixed, opened, closed and disassembled by utilizing the buckle nut structure, so that the fixing strength is ensured, and meanwhile, the fixing device is convenient to use, convenient to correct the installation deviation, easy to replace and maintain, capable of being manufactured on a large scale and low in cost. The aperture of the electrode of the second porous screen is 3.0-5.0mm, and coal ash and the like generated by full combustion after plasma treatment can directly leak into the bottom through the multiple holes, so that the collection and the treatment are convenient, and the time and the labor are saved;
(4) The coal of the invention acts as a dielectric in the electrode structure and can be considered to be quasi-steady-state during the combustion phase of the pool fire. Along with the advancement of the coal combustion process, according to the change of the residual quantity of the coal, the stacking mode and other factors, the excitation parameters of the power supply, such as voltage amplitude, alternating current frequency and the like, the flowing wind speed and the like, can also be changed; the discharge uniformity of DBD plasma, the type and the concentration of high-energy active particles can be regulated, the combustion process of coal is further regulated and controlled, the combustion effectiveness of the treated coal is ensured, the application range of a plasma combustion-supporting technology is widened, and the method has a wide large-scale application prospect.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a dielectric barrier discharge plasma-assisted coal combustion generating device;
fig. 2 is a schematic structural view of the porous screen electrode proposed in fig. 1 according to the present invention.
In the figure: 1-shell, 2-first porous screen electrode, 3-second porous screen electrode, 4-buckle nut, 5-ground electrode lead, 6-high voltage electrode lead, 7-high voltage alternating current power supply, 8-discharge combustion chamber.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only the structures which are relevant to the invention.
Referring to fig. 1-2, a dielectric barrier discharge plasma assisted coal combustion generating device is characterized by comprising an outer shell 1, a ground electrode lead 5 and a high-voltage electrode lead 6, wherein the outer shell 1 is hollow, the outer shell 1 is made of materials with electrical insulation and high temperature resistance, such as polytetrafluoroethylene and ceramics, the ceramics are preferably used as insulating materials, but not limited to the materials, the upper end face of the dielectric barrier discharge plasma assisted coal combustion generating device is provided with a first porous screen electrode 2, the lower end face of the dielectric barrier discharge plasma assisted coal combustion generating device is provided with a second porous screen electrode 3, the ground electrode lead 5 is fixed through an embedded nut, the first porous screen electrode 2 is connected with the ground electrode lead 5 and is connected with the ground end of a high-voltage alternating current power supply 7, the high-voltage electrode lead 6 is fixed through the embedded nut, the second porous screen electrode 3 is connected with the high-voltage electrode lead 6 and is connected with the high-voltage alternating current power supply 7.
The first porous screen electrode 2, the second porous screen electrode 3 and the outer shell 1 form a ventilation type discharge combustion chamber 8, bulk coal is placed in the discharge combustion chamber 8 for DBD discharge and combustion, the coal is in a quasi-steady state existing process in the combustion process, the coal is a burnt object and a dielectric medium, and the dielectric medium is used for blocking the discharge to generate low-temperature plasma and acts on the combustion process.
The discharge medium and the combustion object are lump coal, flame plasma is formed in the process of applying DBD plasma to coal combustion, and the flame plasma further acts with the DBD plasma, so that the discharge starting voltage is reduced, the DBD discharge inevitably generates a large amount of heat, and in general, the heat energy is harmful to the medium.
The first porous screen electrode 2 and the second porous screen electrode 3 are identical in structural material, and the first porous screen electrode 2 and the second porous screen electrode 3 are arranged in parallel in the outer shell 1.
The first porous screen electrode 2 and the second porous screen electrode 3 are provided with the buckle nuts 4, the number of the buckle nuts 4 applied to a single porous screen electrode is 2-4, stainless steel materials or copper materials are adopted, and the outer shell 1 is provided with the clamping grooves matched with the buckle nuts 4, so that the first porous screen electrode 2 and the second porous screen electrode 3 and the outer shell 1 form a stable buckle fixing structure after being embedded and installed, and the operation of fixing, opening, closing, dismounting and the like is facilitated.
The DBD plasma generating unit is formed by the screen electrode and coal, the structure is simple and exquisite in conception, the first porous screen electrode 2 and the second porous screen electrode 3 can directly realize the gas circulation function of a gas inlet and a gas outlet, the treatment is carried out at normal temperature and normal pressure, the high cost of vacuum equipment can be saved, and the uniformity of generated plasmas is good along with the adjustment of parameters such as voltage, frequency, modulation pulse frequency and the like in the discharging process.
The diameters of the holes of the first porous screen electrode 2 and the second porous screen electrode 3 are 3.0-5.0mm, the thicknesses of the holes are 0.8-1.5mm, the first porous screen electrode 2 and the second porous screen electrode 3 are of porous screen structures, the gas flowing functions of a gas inlet and a gas outlet are directly realized, and coal ash and the like generated by full combustion after plasma treatment directly leak into the bottom through the holes of the second porous screen electrode 3.
The high-voltage alternating current power supply 7 is a power supply of the plasma generating device, and can adjust voltage amplitude, power supply frequency, modulation pulse frequency and the like, and the combustion process rate is adjusted and controlled by affecting the stable change of parameters. The high-voltage alternating current power supply 7 is a pulse modulated sinusoidal alternating current power supply, the power supply power of the high-voltage alternating current power supply 7 is 800-2000W, the voltage peak-peak value is 0-60kV, the alternating current frequency is 5-35kHz, the modulation pulse frequency is 10-1000Hz, the duty ratio is 1-100% controllable, the contact temperature is prevented from being too high due to arc discharge, and electrode ablation is prevented.
Working principle: after the first porous screen electrode 2 is opened, coal is placed in the discharge combustion chamber 8, a high-voltage alternating current power supply 7 is opened to start discharging, and the used power supply is a high-voltage high-frequency alternating current power supply for generating DBD plasma; wire-shaped channels are generated when the discharge starts, only one uniform breakdown occurs in each half period of the voltage, and the discharge is gradually uniform along with the increase of the voltage and the frequency, so that stable atmospheric pressure glow discharge is formed; in the propelling process of the combustion process, the types and the concentrations of the high-energy active particles in the plasma can be adjusted by adjusting parameters such as the voltage amplitude, the alternating frequency and the like of the high-voltage alternating current power supply 7; the medium is coal, and the discharge area and the combustion area are in the same area, so that the flame is also a plasma, and the flame acts with the plasma to reduce the discharge starting voltage during the subsequent discharge, thereby being beneficial to dynamically regulating the combustion supporting efficiency of the plasma; meanwhile, the DBD discharge can generate a large amount of heat energy, and is applied to coal combustion in turn, so that coal energy is fully and reasonably applied, and the combustion efficiency is improved.
The generating device for assisting coal combustion by the dielectric barrier discharge plasma provided by the invention works in a normal temperature and normal pressure environment, so that the expensive cost of vacuum equipment is saved, the porous screen electrode can bear the functions of gas inlet and gas outlet, and stable and uniform plasma can be generated by combining a uniform gas flow mode; the chemical balance of the combustion system is influenced by using high-energy particles and active groups in the plasma, the combustion process of the system is regulated and controlled, and the effect is remarkable.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (7)
1. The utility model provides a generating device that dielectric barrier discharge plasma assists coal burning, its characterized in that includes shell body, ground electrode lead wire and high voltage electrode lead wire, the shell body is the cavity setting, the shell body is made by having electrical insulation and high temperature resistant material, and its up end is provided with first porous screen electrode, and its lower terminal surface second porous screen electrode, the ground electrode lead wire is fixed through built-in nut, and embedded in shell body top right side, and first porous screen electrode links to each other with the ground electrode lead wire and is connected in high voltage ac power supply ground terminal, the high voltage electrode lead wire is fixed through built-in nut, embedded in shell body bottom, and second porous screen electrode links to each other with high voltage electrode lead wire and is connected in high voltage ac power supply terminal.
2. The dielectric barrier discharge plasma-assisted coal combustion generating device of claim 1, wherein the first porous screen electrode and the second porous screen electrode are disposed in parallel in the outer housing.
3. The device for generating the dielectric barrier discharge plasma assisted coal combustion according to claim 1, wherein the first porous screen electrode and the second porous screen electrode are respectively provided with a fastening nut, and the outer shell is provided with a fastening groove matched with the fastening nuts, so that the first porous screen electrode and the second porous screen electrode form a stable fastening fixing structure after being embedded and installed with the outer shell.
4. The device for generating the dielectric barrier discharge plasma assisted coal combustion according to claim 1, wherein the diameters of the holes of the first porous screen electrode and the second porous screen electrode are 3.0-5.0mm, the thicknesses of the holes of the first porous screen electrode and the second porous screen electrode are 0.8-1.5mm, and the first porous screen electrode and the second porous screen electrode are of porous screen structures and are used for realizing gas flow of a gas inlet and a gas outlet.
5. The device for generating the dielectric barrier discharge plasma assisted coal combustion according to claim 1, wherein the high-voltage alternating current power supply is a pulsed sinusoidal alternating current power supply, the power of the high-voltage alternating current power supply is 800-2000W, the voltage peak-peak value is 0-60kV, the alternating current frequency is 5-35kHz, the modulation pulse frequency is 10-1000Hz, and the duty ratio is 1-100% controllable.
6. The apparatus of claim 1, wherein the first porous screen electrode, the second porous screen electrode and the outer housing form a gas permeable discharge combustion chamber.
7. The dielectric barrier discharge plasma-assisted coal combustion generating device according to claim 6, wherein the discharge combustion chamber is internally provided with a lump coal for DBD discharge and combustion.
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| CN202110441243.9A CN113365404B (en) | 2021-04-23 | 2021-04-23 | Dielectric barrier discharge plasma auxiliary coal combustion generating device |
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