CN104879780A - Multichannel plasma area igniting burner - Google Patents
Multichannel plasma area igniting burner Download PDFInfo
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- CN104879780A CN104879780A CN201410072681.2A CN201410072681A CN104879780A CN 104879780 A CN104879780 A CN 104879780A CN 201410072681 A CN201410072681 A CN 201410072681A CN 104879780 A CN104879780 A CN 104879780A
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Abstract
The invention discloses a multichannel plasma area igniting burner. The igniting burner comprises a plasma power supply, a nozzle, an air inlet fish nozzle, a tangential air hole, an air pipe, a hollow insulator, a high-voltage electrode, an insulation piece, a low-voltage electrode, a housing, a swirl chamber, air vents, barrier mediums, a low-speed area, center jet flow and a flame stabilization chamber. Fuel oil is atomized by the use of a splash plate disposed inside the air inlet pipe, mixed gas composed of high-speed rotation air-flow and direct current jet flow is disposed inside the igniting burner, and the two flows cool the igniting burner. The space between the high-voltage electrode and the low-voltage electrode is filled with the inflammable mixed gas flowing at a low speed, so that multi-point discharge and ignition can be carried out in a low-speed mixed gas area inside the igniting burner; and an on-duty high-temperature combustion thermonuclear area and the flame stabilization chamber have ignition source and flame stabilization functions and form a miniature high-speed combustion chamber, so that the combustion chamber can efficiently and reliably ignite and keep flames stable under poor conditions such as high-speed, low-temperature, low-pressure, coal firing and the like.
Description
Technical field
The present invention relates to field of aerospace technology and industrial combustion field, particularly relate to a kind of multichannel heating region ignition burning device.
Background technology
Common sparking mode has hot surface, induced with laser spark, spark plug and plasma jet, and they are all do not fire mixed gas by heating, its temperature is raised, produces initial radical, then cause chain reaction by these initial radical.To hot surface ignitor, its ignition delay time is longer, and the life-span is shorter; Induced with laser spark ignition then needs focused high-energy laser pulse; Plug ignition is then a kind of extensive use, reliable sparking mode.All there is the little problem of ignition zone in these sparking mode above-mentioned, when combustion conditions very severe, as problems such as upper low igniting, supersonic combustion, lean combustions, the applicability of existing sparking mode and reliability with regard to existing defects, thus can cause ignition difficulties or light a fire unsuccessful.
The main sparking mode of existing engine is hot-shot ignition, precombustion-chamber ignition, plug ignition.Hot-shot ignition is in main chamber, feed one oil inflame, and produce tongues of fire, through turbine, light after-burner, shortcoming produces certain impact to turbine reliability, and system is more complicated.The catalyst of catalytic ignition easily lost efficacy and corroded, and ignition delay time is long, and pyrotechnics spark ignition can only once use on the engine, can not realize repeatedly lighting a fire.The after-burner of high-altitude vehicle and stamping combustion chamber, under high speed, low pressure, cryogenic conditions, pressure can be low to moderate 0.04-0.05MPa, temperature drops to 50-150 DEG C, and air velocity is at more than 100m/s, due to atomization and vaporization difficulty, unit volume release heat reduces, heat radiation is but very strong, and the rate-pressure border not only caught fire sharply reduces, and the Air/Fuel Ratio border caught fire also sharply reduces.If continue to use plug ignition, failed possibility increases greatly.For ensureing the reliable ignition of engine under various extreme condition, spark plug must be overcome under upper low, there is this defect of ignition difficulties, wishing the igniting skill developing a kind of advanced person.
Generating plant pulverized coal boiler starts, and use fuel nozzle igniting the earliest, a large amount of fuel consumption, cost is large.Then adopt hot plasma igniter, cost and service life are all very high, and Gasifying Small Oil Gun igniting uses the equipment such as compressed air, and system is more complicated, is further improved and optimizes.
The strengthening of low temperature plasma ignition and combustion is a kind of new application approach of plasma technique, and it has the potentiality realizing reliable, the efficient igniting of Weak mixture and conflagration, and this technology has caused the extensive concern of countries in the world.Exchanging the dielectric barrier discharge driven is the major way producing low-temperature plasma, the low temperature plasma that volume is large, energy density is high can be produced under pressure, and due to the existence of dielectric between electrode, avoid the shelf depreciation or arc discharge that easily occur in discharge process.Low temperature plasma igniting mainly through discharging in flammable mixture, utilize the high energy electron that produces and the collision of fuel molecule to cause the dissociation of molecule, excite and even ionize, produce the materials such as a large amount of active atomic, molecule and ion, thus improve ignition quality and combustion stability.Chemical reaction is carried out at multiple spot, accelerates ignition process, thus successfully achieve large volume igniting, flame is full of whole gas channel cross section, and highly shortened ignition delay time and improve inflammability limit, ignition effectiveness is high, saves ignition energy.
Overseas utilization exchanges driving continuously, when flammable mixed gas is by discharge space, will produce low temperature plasma, and successfully achieve large volume igniting, flame is full of whole discharge space, highly shortened ignition delay time and improves inflammability limit.But when adopting continuous discharge igniting, block media is in the flame of high temperature, easily breakdown, thus become some continuous discharge, during using plasma jet initiation, by the form of continuous discharge arcing, plasma jet is injected in flammable mixed gas, the electric energy that both consume is comparatively large, and reliability has certain deficiency.Domestic experiment adopts one-sided dielectric barrier discharge under confirming flammable initial pressure scope 0.02-0.1Mpa and flow velocity 5-70m/s condition, with methane, ethene, Fuel Petroleum for fuel, achieves the large volume igniting of whole mixed gas channel cross-section.
Plug ignition and heat plasma flow point fire puncture medium by electrical discharge arc, although hot plasma is plugged with certain advantage than spark, ignition quality is improved than spark plug, shorten time delay, but belong to small size igniting, and heat plasma flow point fire needs to consume a large amount of energy, ignition effectiveness is low, ignitor is perishable, and system equipment is complicated, and hot plasma firing technique at aviation field without successful Application case.Light a fire in high velocity air in engine, need, in spark plug front, flame stabilizer is installed, thus produce certain low regime and recirculating zone at spark plug near zone, produce small flame micelle by small and weak ignition energy like this, progressively develop, flame development becomes stable fired state.Plug ignition and plasma jet all belong to plasma igniting, just produce amount of ions different with region, both energy dissipations are more serious, the spark plug that consumed energy is little, just discharge between very closely spaced high-field electrode and low-field electrode, electrode inserts in mixed gas, if flowing velocity is larger, pressure and temperature is lower, ignition difficulties will be there is, and the air velocity near spark plug is closely related with the duty of engine, can not control separately, thus occur that ignition difficulties is inevitable.
Engine be in high-altitude, at a high speed, low pressure, low temperature state of flight, combustion chamber operating mode is very severe, easily occurs degradation problem under low-tension ignition difficulty, poor combustion stability, efficiency of combustion.Coal burning boiler of power station starts also needs efficient igniter, to reduce costs further, reduces disposal of pollutants.
Summary of the invention
The technical issues that need to address of the present invention are that the high efficient and reliable how engine realizes under high speed, low temperature and lower pressure is lighted a fire and flame stabilization, and the igniter of generating plant pulverized coal boiler.
In order to solve above technical problem, the invention discloses a kind of multichannel heating region ignition burning device, comprising: plasma electrical source, nozzle, air inlet fish mouth, tangential pore, tracheae, hollow insulator, high-field electrode, insulating part, low-field electrode, shell, spin chamber, pore, block media, low regime, central jet, stable flame chamber; Described plasma electrical source exports the high voltage low current exchanging and drive, and is lighted the flammable mixed gas of low regime by the electric discharge between high-field electrode and low-field electrode; Described nozzle is arranged on air inlet fish mouth tube wall; Described air inlet fish mouth refers to the middle air inlet pipe with spattering plate atomization, is arranged on shell, is connected with body seal, after ensureing that high velocity air enters spin chamber, produces swirling eddy at a high speed; Described tracheae is connected with hollow insulator, and mixed pneumatic transmission is entered the pipeline of high-field electrode, fuel mixes gas, or adopts separately air inlet fish mouth fuel to mix gas; Described hollow insulator is arranged between high-field electrode and tracheae, and its downstream is high-field electrode, and upstream is tracheae, ensures the gentle pipe insulation of high-field electrode; Described high-field electrode is hollow metallic body, is arranged on the electrode of igniter center, and inside has central jet hole, and outside is connected with insulating part, and it is connected with the high-voltage line of plasma electrical source; Described insulating part is arranged between high-field electrode and low-field electrode, is high-field electrode inside it, and outside is low-field electrode, high-field electrode and low-field electrode coaxial; Described low-field electrode is the pipe of hollow, it has the pore of some, ensures the gas flowing of the low regime of high-field electrode and low-field electrode, it is insulating part inside it, outside is housing, and with inner side insulating part and outside housing compact siro spinning technology, it is connected with the low-voltage line of plasma electrical source; Described shell is cylindrical hollow metalwork, and inner side is connected with low-field electrode, and outer side surface and air inlet fish mouth are tightly connected, and one end is connected with dielectric, and one end is be communicated with stable flame chamber; Described spin chamber is the swirling eddy passage in shell, is housing outside it, and inner side is low-field electrode, and one end is the outlet be connected with stable flame chamber; Described pore is mixed gas flow orifice voltage electrode having some; Described block media refers to the insulating materials be arranged on outside high-field electrode, ensures that the low regime between high-field electrode and low-field electrode produces the low temperature plasma of large volume; Described low regime is the spatial flow region between high-field electrode and low-field electrode, reliable ignition under guarantee low-speed conditions; Described central jet is the jet at high-field electrode center, ensures the penetration capacity of igniter jet flame; Described stable flame chamber is the flameholding region of definite shape, and it is arranged on shell one end exit.
Further, preferred as one, a kind of multichannel heating region ignition burning device, it is characterized in that, comprising: plasma electrical source, nozzle, air inlet fish mouth, tangential pore, tracheae, hollow insulator, high-field electrode, insulating part, low-field electrode, shell, spin chamber, pore, thrust, low regime, central jet, stable flame chamber; Described plasma electrical source exports the high voltage low current exchanging and drive, and is lighted the flammable mixed gas of low regime by the electric discharge between high-field electrode and low-field electrode; Described nozzle is arranged on air inlet fish mouth tube wall, and fuel oil is directly injected to and spatters on plate; Described air inlet fish mouth refers to the middle air inlet pipe with spattering plate atomization, is arranged on shell, is connected with body seal, after ensureing that high velocity air enters spin chamber, produces swirling eddy at a high speed; Described tracheae is connected with hollow insulator, and mixed pneumatic transmission is entered the pipeline of high-field electrode, fuel mixes gas, or adopts separately air inlet fish mouth fuel to mix gas; Described hollow insulator is arranged between high-field electrode and tracheae, and its downstream is high-field electrode, and upstream is tracheae; Described high-field electrode is hollow metallic body, is arranged on the electrode of igniter center, and inside has central jet hole, and outside is connected with insulating part, and it is connected with the high-voltage line of plasma electrical source; Described insulating part is arranged between high-field electrode and low-field electrode, is high-field electrode inside it, and outside is low-field electrode, high-field electrode and low-field electrode coaxial; Described low-field electrode is the pipe of hollow, it has the pore of some, ensures the gas flowing of the low regime of high-field electrode and low-field electrode, it is insulating part inside it, outside is housing, and with inner side insulating part and outside housing compact siro spinning technology, it is connected with the low-voltage line of plasma electrical source; Described shell is cylindrical hollow metalwork, and inner side is connected with low-field electrode, and outer side surface and air inlet fish mouth are tightly connected, and one end is the outlet be connected with stable flame chamber; Described spin chamber is the swirling eddy passage in housing, and be housing outside it, inner side is low-field electrode, and one end is connected with dielectric, and one end is communicated with stable flame chamber; Described pore is mixed gas flow orifice low-field electrode having some; High-field electrode is arranged the protrusion of certain number of permutations, its size is identical, and outer end external diameter is identical, ensures that the probability that each protrusion of high-field electrode discharges to low-field electrode is identical; Described low regime is the spatial flow region between high-field electrode and low-field electrode, reliable ignition under guarantee low-speed conditions; Described central jet is the jet at high-field electrode center, ensures the penetration capacity of igniter jet flame; Described stable flame chamber is the flameholding region of definite shape, and it is arranged on shell one end exit.
Further, preferred as one, described air inlet fish mouth is arranged on the entrance point of shell and low-field electrode, is connected with inlet seal; Described tangential pore is air inlet fish mouth venthole, and air inlet fish mouth outlet opening is provided with one or more blade, and exit vane makes air-flow High Rotation Speed in spin chamber, and exit vane width is identical with spin chamber's radial spacing.
Further, preferred as one, described air inlet fish mouth is arranged on shell one end relative with stable flame chamber, is connected with body seal; Described tangential pore is air admission hole, and its height is identical with spin chamber's radial distance.
Further, preferred as one, described protrusion gap 2-10mm.
Further, preferred as one, described tangential pore is that the exit vane of air inlet fish mouth makes air-flow High Rotation Speed in spin chamber.
Further, preferred as one, described insulating part is refractory ceramics.
Further, preferred as one, high-field electrode is pipe or cylinder.
Further, preferred as one, described tracheae one end is connected with air inlet fish mouth, or tracheae adopts independent air inlet fish mouth fuel to mix gas.
Further, preferred as one, the voltage of described plasma electrical source, electric current and a-c cycle are respectively: 1-10kV, 0.1-10A and 10-500kHz.
Further, preferred as one, discharge frequency and the discharge time in each cycle of described plasma electrical source are respectively: 2-1000Hz and 0.2-500ms.
Further, preferred as one, described power supply, under low frequency operation condition, uses nanosecond pulse power supply.
Due to low regime electric discharge in igniter, realize the multi-point spark in mixed gas region, and this region is high-temp combustion thermonuclear district, plays the effect of incendiary source and flame stabilization, thus the high efficient and reliable igniting realized under high speed, low temperature and lower pressure and flame stabilization.The present invention makes full use of fuel-oil atmozation evaporation mixing and the burning flame stabilization function of High Rotation Speed air-flow, the penetration capacity of high-field electrode high-speed central jet flame, low regime between high-field electrode and low-field electrode realizes plasma multi-point spark and region igniting, low regime is the thermonuclear district of high-temp combustion, high-field electrode and low-field electrode outlet are recirculating zone, form miniature high-speed combustion chamber, tool has the following advantages:
1. arrange jet at high-field electrode center and mix gas, improve combustion zone turbulivity, improve oil gas blending, flame rigidity is strong.
2. utilize air inlet fish mouth tangentially to introduce High Rotation Speed fuel oil and mix gas, greatly improve fuel-oil atmozation evaporation and blending performance, structure is simple, and flow losses are little.
3., the low regime between high-field electrode and low-field electrode, affects little by external air flow, by the multiple electric discharge protrusions on high-field electrode, realizes multiple spot and discharging regions igniting.
4. by the pore on low-field electrode and low regime outlet, continuously to the fresh mixed gas of low regime supply, discharge combustion product, low regime forms the thermonuclear district of burning simultaneously, plays ignition action on duty.
, there is the transition region that turbulivity is very large, speed is lower in the recirculating zone that the central jet 5. in stable flame chamber is formed through swirling eddy, thus putting fire ring is double-deck annular space structure, and ignition ability is strong between two strands of air-flows.
6. central jet and swirling eddy speed very high, in high-field electrode and spin chamber, there is not flame, air-flow plays cooling effect to igniter, ensures the security reliability of igniter.
7.. volume is little, and structure is simple, and flame rigidity is strong, and penetration capacity is strong, and sufficient combustion, can set up stable incendiary source.
Therefore, a kind of multichannel heating region of the present invention ignition burning device, there is the oil atomization combustion by evaporation performance improving fuel oil under low pressure, low temperature, high velocity air condition, improve the reliability of high-altitude ignition and regnition, improve combustibility, and meet the igniting demand of coal burning boiler of power station.
Accompanying drawing explanation
When considered in conjunction with the accompanying drawings, by referring to detailed description below, more completely can understand the present invention better and easily learn wherein many adjoint advantages, but accompanying drawing described herein is used to provide a further understanding of the present invention, form a part of the present invention, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention, wherein:
Fig. 1 multichannel heating region ignition burning device embodiment 1 structural representation.
Fig. 2 multichannel heating region ignition burning device embodiment 2 structural representation.
Detailed description of the invention
With reference to Fig. 1-2, embodiments of the invention are described.
For enabling above-mentioned purpose, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
After changing a social system low-temperature plasma electrical source, can produce interval and produce low temperature plasma, discharge time, 0.1-1000ms was adjustable, frequency 0.1-1000 hertz.Adopt dielectric barrier discharge, produce a large amount of low temperature plasmas at region of discharge, the flammable mixed gas in low regime that can realize between high-field electrode and low-field electrode catches fire.If discharged to low-field electrode by protruding object point multiple on space high-voltage electrode, the region of electric discharge expands, even if the mixed gas composition of zones of different is different with air-flow velocity, as long as regional area is in the flammable border of igniting and speed envelope, just can guarantee point pyrogene merit.The energy Ratios spark plug that experiment demonstrates impulse discharge is much lower, but frequency can be very high, such as discharge frequency 200 hertz, there are 20 protrusion point of discharges, they are in the diverse location in mixed gas, and supposing that the electric discharge probability of each protrusion is identical, each electric discharge protrusion is 10 hertz in the discharge frequency of each second.For the flammable mixed gas of the flowing between sparking electrode, as long as the mixed gas flowing through a certain electric discharge protrusion is suitable, just can light a fire successfully.According to this thinking, under development and Design high velocity air condition, region point ignition method and technology, under upper low, the reliable ignition of aircraft is given security.
Embodiment 1:
As shown in Figure 1, a kind of multichannel heating region ignition burning device, mainly comprises nozzle 1, air inlet fish mouth 2, tangential pore 3, tracheae 4, hollow insulator 5, high-field electrode 6, insulating part 7, low-field electrode 8, shell 9, spin chamber 10, pore 11, block media 12, low regime 13, central jet 14, stable flame chamber 15; Described nozzle 1 refers to smooth-bore tip or other nozzle, is arranged on certain position in air inlet fish mouth tube wall; Described air inlet fish mouth 2 refers to the middle air inlet pipe with spattering plate atomization, and it is arranged on shell 9 and the entrance point of low-field electrode 8, is connected with inlet seal; Described tangential pore 3 refers to air inlet fish mouth 2 venthole, and air inlet fish mouth 2 outlet opening is provided with one or more blade, and exit vane makes air-flow High Rotation Speed in spin chamber, and exit vane height is identical with spin chamber's radial spacing; Described tracheae 4 refers to that the mixed pneumatic transmission come from air inlet fish mouth enters the pipeline of high-field electrode, and be connected with hollow insulator 5, or arrange air inlet fish mouth in hollow insulator 5 import separately, fuel mixes gas; Described hollow insulator 5 is arranged between high-field electrode and tracheae, and its downstream is high-field electrode, and upstream is tracheae; Described high-field electrode 6 refers to metal circular tube or cylinder, is arranged on the electrode of igniter center, and inside has central jet hole, outside is connected with insulating part, on it or place insulation barrier medium, or be provided with electric discharge protrusion, it is connected with the high-voltage line of plasma electrical source; Described insulating part 7 refers to insulating materials such as being arranged on pottery between high-field electrode and low-field electrode, and ensure the good electric discharge between high-field electrode and low-field electrode, be high-field electrode inside it, outside is low-field electrode, guarantee high-field electrode and low-field electrode coaxial; Described low-field electrode 8 refers to the pipe of hollow, it has the aperture of some, ensure the gas flowing of the low regime of high-field electrode and low-field electrode, it is insulating part inside it, outside is housing, with inner side insulating part and outside housing compact siro spinning technology, it is connected with the low-voltage line of plasma electrical source; Described shell 9 refers to cylindrical hollow metalwork, and inner side is connected with low-field electrode, and outer side surface and air inlet fish mouth are tightly connected, and one end is connected with dielectric, and one end outlet is connected with stable flame chamber; Described spin chamber 10 refers to the swirling eddy passage in shell, is housing outside it, and inner side is low-field electrode, and import is insulating part, exports as stable flame chamber; Described pore 11 refers to mixed gas flow orifice low-field electrode having some, ensures that the mixed air-flow in low regime moves, makes there is flame combustion all the time in low regime; Described block media 12 refers to the insulating materials be arranged on outside high-field electrode, ensures that the low regime between high-field electrode and low-field electrode produces the low temperature plasma of large volume, thus realizes large volume igniting.Or the protrusion 16(arranging certain number of permutations on high-field electrode is see Fig. 2), its size is identical, outer end external diameter is identical, be positioned at low regime, ensure that the probability that each protrusion of high-field electrode discharges to low-field electrode is identical, guarantee multiple spot discharges, or uses nanosecond pulse power supply not use dielectric barrier discharge; Described low regime 13 refers to the space peace flow region between high-field electrode and low-field electrode, reliable ignition under guarantee low-speed conditions; Described central jet 14 refers to the jet at high-field electrode center, ensures the penetration capacity of igniter jet flame; Described stable flame chamber 15 refers to that region is doomed in the burning of definite shape, and it is arranged on housing outlets place, creates recirculating zone, the stability of guarantee point flame, sufficient combustion.
Embodiment 2:
As shown in Figure 2, a kind of multichannel heating region ignition burning device, mainly comprises nozzle 1, air inlet fish mouth 2, tangential pore 3, tracheae 4, hollow insulator 5, high-field electrode 6, insulating part 7, low-field electrode 8, shell 9, spin chamber 10, pore 11, protrusion 16, low regime 13, central jet 14, stable flame chamber 15; Described nozzle 1 refers to smooth-bore tip or other nozzle, is arranged on certain position in air inlet fish mouth tube wall; Described air inlet fish mouth 2 refers to the middle air inlet pipe with spattering plate atomization, and it is arranged on the upstream end of shell, is connected with body seal; Described tangential pore 3 refers to rectangle air admission hole, and its height is identical with spin chamber's radial distance, and it is arranged in the upstream end of shell, after ensureing that high velocity air enters spin chamber, produces swirling eddy at a high speed; Described tracheae 4 refers to that the mixed pneumatic transmission come from air inlet fish mouth enters the pipeline of high-field electrode, and be connected with high-field electrode, also can be and arrange air inlet fish mouth in high-field electrode import separately, fuel mixes gas; Described hollow insulator 5 is arranged between high-field electrode and tracheae, and its downstream is high-field electrode, and upstream is tracheae; Described high-field electrode 6 refers to metal circular tube or cylinder, be arranged on the electrode of igniter center, inside has central jet hole, outside is connected with insulating part, on it or be provided with and put protrusion 16, or place insulation barrier medium 12(see Fig. 1), it is connected with the high-voltage line of plasma electrical source; Described insulating part 7 refers to insulating materials such as being arranged on pottery between high-field electrode and low-field electrode, and ensure the good electric discharge between high-field electrode and low-field electrode, be high-field electrode inside it, outside is low-field electrode, guarantee high-field electrode and low-field electrode coaxial; Described low-field electrode 8 refers to the pipe of hollow, it has the aperture of some, ensure the gas flowing of the low regime of high-field electrode and low-field electrode, it is insulating part inside it, outside is housing, with inner side insulating part and outside housing compact siro spinning technology, it is connected with the low-voltage line of plasma electrical source; Described shell 9 refers to cylindrical hollow metalwork, and inner side is connected with low-field electrode, and outer side surface and air inlet fish mouth are tightly connected, and one end is connected with dielectric, and one end outlet is connected with stable flame chamber; Described spin chamber 10 refers to the swirling eddy passage in shell, is housing outside it, and inner side is low-field electrode, and import is insulating part, exports as stable flame chamber; Described pore 11 refers to mixed gas flow orifice low-field electrode having some, ensures that the mixed air-flow in low regime moves, makes there is flame combustion all the time in low regime; Described electric discharge protrusion 16 refers to protrusion high-field electrode being arranged certain number of permutations, its size is identical, outer end external diameter is identical, be positioned at low regime, ensure that each protrusion of high-field electrode 16 is identical to the probability of low-field electrode electric discharge, ensure multiple spot electric discharge, or installing insulating block media outside cylindrical pressure electrode, discharging in feasible region, or uses nanosecond pulse power supply not use dielectric barrier discharge; Described low regime 13 refers to the space peace flow region between high-field electrode and low-field electrode, reliable ignition under guarantee low-speed conditions; Described central jet 14 refers to the jet at high-field electrode center, ensures the penetration capacity of igniter jet flame; Described stable flame chamber 15 refers to that region is doomed in the burning of definite shape, and it is arranged on housing outlets place, creates recirculating zone, the stability of guarantee point flame, sufficient combustion.
Erection sequence: high-field electrode 6 is connected with insulating part 7; Insulating part 7 is connected with low-field electrode 8; Low-field electrode 8 is connected with shell 9; Shell 9 is connected with stable flame chamber 15; Nozzle 1 is connected with air inlet fish mouth 2; Air inlet fish mouth 2 is connected with low-field electrode 8 and shell 9; Air inlet fish mouth 2 is connected with tracheae 4; Tracheae 4 is connected with hollow insulator 5; Hollow insulator 5 is connected with high-field electrode; High-field electrode 5 is connected with the high-voltage line of power supply; Low-field electrode 8 is connected with the low-voltage line of power supply.
The course of work of multichannel heating region of the present invention ignition burning device is as follows: in the combustion chamber of engine, the air inlet of air inlet fish mouth 2 exists always, fuel oil is ejected into spattering on plate of air inlet fish mouth 2 by nozzle 1 and is atomized blending, fuel oil mixes gas and enters spin chamber 10 by tangential pore 3, fuel oil mixes gas High Rotation Speed in spin chamber 10, improve atomization and vaporization and the blending of fuel oil, mixed cyclone turn of tidal stream goes out spin chamber 10, enter stable flame chamber 15, cause pressure in igniter low owing to rotating mixed gas, fuel oil mixes gas or flows into low regime 13 from the pore 11 of low-field electrode 8, or mixed gas flows into low regime from the outlet of low regime 13, flow out from the pore 11 low-field electrode again, another strand of fuel oil mixes gas and enters high-field electrode 6 by tracheae 4, mixed gas passes stable flame chamber 15 by central jet 14, while fuel feeding, plasma electrical source starts energising, protrusion 16 of putting on high-field electrode 6 discharges to low-field electrode 8, light the flammable mixed gas in low regime 13, the mixed gas of recirculating zone in the flame ignition stable flame chamber 15 in low regime 13, flame is lighted swirling eddy further and is mixed gas and high-speed jet mixes gas, thus establish stable high-speed flame, this powerful high-speed jet flame, can mix gas by the fuel oil in ignition engine combustion chamber, ensure reliable ignition and the flame holding of engine.
Describe from above, the present invention is by making full use of fuel-oil atmozation evaporation mixing and the burning flame stabilization function of High Rotation Speed air-flow, the penetration capacity of high-field electrode high-speed central jet flame, low regime between high-field electrode and low-field electrode realizes plasma multi-point spark and region igniting, this high-temp combustion thermonuclear district on duty and stable flame chamber, play the effect of incendiary source and flame stabilization, form miniature high-speed combustion chamber, high-field electrode and low-field electrode outlet are recirculating zone, high-speed jet and swirling eddy cooling igniter, the high-speed jet flame that this igniter provides, the reliable ignition of engine under low-pressure low-temperature and high-speed condition and smooth combustion can be ensured, extend smooth combustion working range.The present invention, by appropriate design, can meet the needs of high-performance enginer igniting.And the starting ignition demand of coal burning boiler of power station can be met.
A kind of multichannel heating region of the present invention ignition burning device, the parameter area in apply engine is air pressure 0.03-3.0Mpa, inlet air flow temperature 300-1000K, speed 50-200m/s.The fuel flow 0.5-20g/s of this igniter, supply voltage 1-30kV, discharge frequency 5-1000Hz, discharge time, 0.3-1000ms improved fuel-oil atmozation evaporation mixing quality, the high-speed jet flame provided, the reliable ignition of engine under low-pressure low-temperature and high-speed condition and smooth combustion can be ensured, extend smooth combustion working range.Also the ignition ability of coal burning boiler of power station can be improved.
Although the foregoing describe the specific embodiment of the present invention, but those skilled in the art is to be understood that, these detailed description of the invention only illustrate, those skilled in the art, when not departing from principle of the present invention and essence, can carry out various omission, replacement and change to the details of said method and system.Such as, merge said method step, thus then belong to scope of the present invention according to the function that the method that essence is identical performs essence identical to realize the identical result of essence.Therefore, scope of the present invention is only defined by the appended claims.
Claims (9)
1. a multichannel heating region ignition burning device, it is characterized in that, comprising: plasma electrical source, nozzle, air inlet fish mouth, tangential pore, tracheae, hollow insulator, high-field electrode, insulating part, low-field electrode, shell, spin chamber, pore, block media, low regime, central jet, stable flame chamber; Described plasma electrical source exports the high voltage low current exchanging and drive, and is lighted the flammable mixed gas of low regime by the electric discharge between high-field electrode and low-field electrode; Described nozzle is arranged on air inlet fish mouth tube wall, and fuel oil is directly injected to and spatters on plate; Described air inlet fish mouth refers to the middle air inlet pipe with spattering plate atomization, is arranged on shell, is connected with body seal, after ensureing that high velocity air enters spin chamber, produces swirling eddy at a high speed; Described tracheae is connected with hollow insulator, and mixed pneumatic transmission is entered the pipeline of high-field electrode, fuel mixes gas, or adopts separately air inlet fish mouth fuel to mix gas; Described hollow insulator is arranged between high-field electrode and tracheae, and its downstream is high-field electrode, and upstream is tracheae; Described high-field electrode is hollow metallic body, is arranged on the electrode of igniter center, and inside has central jet hole, and outside is connected with insulating part, and it is connected with the high-voltage line of plasma electrical source; Described insulating part is arranged between high-field electrode and low-field electrode, is high-field electrode inside it, and outside is low-field electrode, high-field electrode and low-field electrode coaxial; Described low-field electrode is the pipe of hollow, it has the pore of some, ensures the gas flowing of the low regime of high-field electrode and low-field electrode, it is insulating part inside it, outside is housing, and with inner side insulating part and outside housing compact siro spinning technology, it is connected with the low-voltage line of plasma electrical source; Described shell is cylindrical hollow metalwork, and inner side is connected with low-field electrode, and outer side surface and air inlet fish mouth are tightly connected, and one end is the outlet be connected with stable flame chamber; Described spin chamber is the swirling eddy passage in housing, and be housing outside it, inner side is low-field electrode, and one end is connected with dielectric, and one end is communicated with stable flame chamber; Described pore is mixed gas flow orifice low-field electrode having some; Described block media refers to the insulating materials be arranged on outside high-field electrode, ensures that the low regime between high-field electrode and low-field electrode produces the low temperature plasma of large volume; Described low regime is the spatial flow region between high-field electrode and low-field electrode, reliable ignition under guarantee low-speed conditions; Described central jet is the jet at high-field electrode center, ensures the penetration capacity of igniter jet flame; Described stable flame chamber is the flameholding region of definite shape, and it is arranged on shell one end exit.
2. a multichannel heating region ignition burning device, it is characterized in that, comprising: plasma electrical source, nozzle, air inlet fish mouth, tangential pore, tracheae, hollow insulator, high-field electrode, insulating part, low-field electrode, shell, spin chamber, pore, thrust, low regime, central jet, stable flame chamber; Described plasma electrical source exports the high voltage low current exchanging and drive, and is lighted the flammable mixed gas of low regime by the electric discharge between high-field electrode and low-field electrode; Described nozzle is arranged on air inlet fish mouth tube wall, and fuel oil is directly injected to and spatters on plate; Described air inlet fish mouth refers to the middle air inlet pipe with spattering plate atomization, is arranged on shell, is connected with body seal, after ensureing that high velocity air enters spin chamber, produces swirling eddy at a high speed; Described tracheae is connected with hollow insulator, and mixed pneumatic transmission is entered the pipeline of high-field electrode, fuel mixes gas, or adopts separately air inlet fish mouth fuel to mix gas; Described hollow insulator is arranged between high-field electrode and tracheae, and its downstream is high-field electrode, and upstream is tracheae; Described high-field electrode is hollow metallic body, is arranged on the electrode of igniter center, and inside has central jet hole, and outside is connected with insulating part, and it is connected with the high-voltage line of plasma electrical source; Described insulating part is arranged between high-field electrode and low-field electrode, is high-field electrode inside it, and outside is low-field electrode, high-field electrode and low-field electrode coaxial; Described low-field electrode is the pipe of hollow, it has the pore of some, ensures the gas flowing of the low regime of high-field electrode and low-field electrode, it is insulating part inside it, outside is housing, and with inner side insulating part and outside housing compact siro spinning technology, it is connected with the low-voltage line of plasma electrical source; Described shell is cylindrical hollow metalwork, and inner side is connected with low-field electrode, and outer side surface and air inlet fish mouth are tightly connected, and one end is the outlet be connected with stable flame chamber; Described spin chamber is the swirling eddy passage in housing, and be housing outside it, inner side is low-field electrode, and one end is connected with dielectric, and one end is communicated with stable flame chamber; Described pore is mixed gas flow orifice low-field electrode having some; High-field electrode is arranged the protrusion of certain number of permutations, its size is identical, and outer end external diameter is identical, ensures that the probability that each protrusion of high-field electrode discharges to low-field electrode is identical; Described low regime is the spatial flow region between high-field electrode and low-field electrode, reliable ignition under guarantee low-speed conditions; Described central jet is the jet at high-field electrode center, ensures the penetration capacity of igniter jet flame; Described stable flame chamber is the flameholding region of definite shape, and it is arranged on shell one end exit.
3. multichannel heating region according to claim 1 and 2 ignition burning device, is characterized in that: described air inlet fish mouth is arranged on the entrance point of shell and low-field electrode, is connected with inlet seal; Described tangential pore is air inlet fish mouth venthole, and air inlet fish mouth outlet opening is provided with one or more blade, and exit vane makes air-flow High Rotation Speed in spin chamber, and exit vane width is identical with spin chamber's radial spacing.
4. multichannel heating region according to claim 1 and 2 ignition burning device, is characterized in that: described air inlet fish mouth is arranged on shell one end relative with stable flame chamber, is connected with body seal; Described tangential pore is air admission hole, and its height is identical with spin chamber's radial distance.
5. multichannel heating region according to claim 4 ignition burning device, is characterized in that: described protrusion gap 2-10mm.
6. any one multichannel heating region according to claim 1 and 2 ignition burning device, is characterized in that: described insulating part is refractory ceramics.
7. any one multichannel heating region according to claim 1 and 2 ignition burning device, is characterized in that: high-field electrode is pipe or cylinder.
8. any one multichannel heating region according to claim 1 and 2 ignition burning device, is characterized in that: described tracheae one end is connected with air inlet fish mouth, or tracheae adopts independent air inlet fish mouth fuel to mix gas.
9. any one multichannel heating region according to claim 1 and 2 ignition burning device, is characterized in that: the voltage of described plasma electrical source, electric current and a-c cycle are respectively: 1-10kV, 0.1-10A and 10-500kHz.
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| CN201410072681.2A CN104879780B (en) | 2014-02-28 | 2014-02-28 | A kind of multichannel heating region ignition burning device |
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