CN1012988B - The method and apparatus of burning fluid fuels - Google Patents
The method and apparatus of burning fluid fuelsInfo
- Publication number
- CN1012988B CN1012988B CN 85101521 CN85101521A CN1012988B CN 1012988 B CN1012988 B CN 1012988B CN 85101521 CN85101521 CN 85101521 CN 85101521 A CN85101521 A CN 85101521A CN 1012988 B CN1012988 B CN 1012988B
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- China
- Prior art keywords
- sound wave
- combustion air
- low
- fuel
- resonator
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- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
What the present invention relates to is the method and apparatus of burning fluid fuels.In order to improve burning velocity and efficient, fuel is spread in the combustion air, and is subjected to the effect of the high point speed of the sound wave that produced by the low-frequency sound wave acoustical generator, and the frequency of sound wave is determined that by acoustical generator best, highest frequency is 30Hz.Combustion air can obtain to move back and forth with the combustion particles that is transported to the there.The low-frequency sound wave acoustical generator is a quarter-wave formula acoustical generator, has tubular resonators, forms a diffuser at its openend.
Description
What the present invention relates to is the method and apparatus that is used for combustion of liquid, gas or pulverised fuel, and above-mentioned fuel is called fluid fuel later on.
As far back as 1961, Fu Heruiyinsite (F.H.Reynst) just once proposed firm putative saying when excessive, i.e. the vibration of sound wave can produce a kind of useful effect to burning.In this regard, can be with reference to the 13rd to the 15th page of described pulse-combustion of Fu Heruiyinsite (FHReynst) collected works of New York Bo Gemang (Perqamon) publishing houses publication in 1961.Though acoustic vibration is very faint, can make gas that fuel particle is produced relative motion, therefore, can fully the combustion products that surrounds this particle be separated with this particle, caused the quickening of burning velocity.Rui Yinsite has introduced the situation that this principle is applied to coal-powder boiler.With air blast fuel and AIR MIXTURES are delivered to precombustion chamber, this precombustion chamber at two between the tapered channel of flow direction expansion.Volatile composition in the fuel burns in precombustion chamber, and flame is introduced in the flame tube.Flame pulse propagation in precombustion chamber is in flame tube, and the air in the flame tube is made air do relative moving to fuel particle by resonance, like this, has just quickened burning as mentioned above.
Swedish patent specification 7701764-8(publication number is 412635) in introduced a kind of burning efflorescence solid, the method for liquid or gaseous fuel, this method are based on the described principle of Rui Yinsite.Yet, according to this patent specification, not that the flame by stove produces vibration.Affact on the combustion flame acoustic energy by external device (ED) for example pinger produce, the frequency range of sound wave is from the infrasonic frequency to the supersonic frequency.But the method described in the Swedish patent specification 7701764-8 obviously still can not be used in practice effectively, we can say that this method still awaits developing to the commercial Application aspect.Also has similar method, as swiss patent specification 281373 and German patent specification 472812 are introduced.Described according to auspicious native patent specification, vibration is passed on a part of combustion chamber and the flue gas at least, and described according to German patent specification, because the diffusion of the air of the air of granular fuel and burning and second-time burning has produced vibration.
Peaceful V.S.Severyanin in the Soviet Union inventors certificate 228216(Fu Sisafu) introduced a kind of pulse-combustion on fuel bed in, can increase the heating grid that free-running solid fuel replaces Rake (Rijke) pipe with one deck.But its effect is very poor, and reason is only to have utilized due to the vibration that himself produces.
US Patent specification 2,945,459 have described a kind of method and apparatus of intermittent combustion, and the air of wherein pulsing is transported in the combustion chamber of the resonatron that forms part acceptance pulsation air.The resonant frequency of resonatron can be regulated by means of an inserted link, an end of this inserted link sealing resonatron, and the other end is an opening, fuel is fed between its two ends in the air in the resonantron.
In addition, a kind of device that reduces the fuel consumption of internal combustion engine is disclosed in the french patent application publication number 2483524.This device includes in the supply pipe that is contained on the related device that is connected to vaporizer or engine, is used for the vibrative sound source of supplying with of air.Its objective is pressure antinode of region generating in air and fuel mix.The length that contains the supply pipe of vibrate air is equivalent to 1/2nd wavelength of the sound wave that produces, and the audio frequency that is produced obviously is higher than the lower limit of AF far away, at least 200 frequently now more than.
Main purpose of the present invention provides a kind of method of burning fluid fuels.Fuel is diffused in the combustion air, and is subjected to the effect of the sound wave that produced by the low-frequency sound wave acoustical generator and produces reciprocating motion.This acoustical generator comprises the tubular resonators with blind end and openend, and this method has been improved the favourable influence of sound wave to burning further, and in fact can be used in the industry.
In order to reach this purpose, the feature of the inventive method is the basic audio frequency work of low-frequency sound wave acoustical generator with resonator, peak frequency is 60 hertz, and combustion air is supplied with by tubular resonators, and fuel is by being contained in the tubular resonators and the feedway of opening within it; Combustion air mixes in the open end near resonator with fuel, and the particle velocity of the low-frequency sound wave at this place is roughly the highest.
In this way, the maximal rate of reciprocating air in resonator, promptly particle velocity will obtain at the openend of resonator, this is because when acoustical generator is worked with the basic audio frequency of resonator, will obtain in tubular resonators due to the reason of standard quarter-wave sound wave.Like this, just can obtain the vibration of fuel particle by the reciprocating air that is produced by acoustical generator, the fuel particle will enter in the air more completely like this, and speed fuel will increase.Length of flame will be shorter than the situation that does not have the sound wave activation as a result for it.
Disclosed method is opposite in this method and the US Patent specification 2,945,459 mentioned in the above, and the air pulse frequency that is admitted to resonatron there is not defined, and under any circumstance is not restricted to basic audio frequency.In addition, the position that fuel is transported to resonatron is defined as the place of the maximum particle velocity of particle.
The present invention also provides a kind of device of implementing said method, this device comprises a low-frequency sound generator and a fluid fuel feedway with tubular resonators, this fluid fuel is spread in the combustion air, and wherein tubular resonators has an openend and a blind end; The length of resonator is the quarter-wave of the sound wave that sends, and its basic audio frequency is maximum 60 hertz; The openend of resonator has the diffuser of the part of a formation resonator; Combustion air is supplied with by resonator, and the opening of feedway is arranged in the inner chamber of diffuser.
At length explain the present invention for clearer, with reference to following accompanying drawing:
Fig. 1 is an axial section of implementing the device of the inventive method, and this device links to each other with a boiler.
Fig. 2 is the part side view of device of the present invention.
Fig. 3 is the part amplification profile along III among Fig. 1-III line.
Shown in Fig. 4 is the isothermal curve figure of the flame when burning under the situation that oil is having the sound wave activation and do not having sound wave to activate.
Fig. 1 comprises a tubular resonators 10 to burner shown in Figure 3, and its length is 1/4th of the wave length of sound that sends.A feeder, (this feeder is referred to as oscillator exigator in the present invention), oscillator 11 is fixed on an end of resonator, and forms a low-frequency sound wave acoustical generator, and oscillator 11 is connected with the feeding pipe 12 of driving gas.Acoustical generator can be one in US Patent specification 4,359962(1982 November 23) in the positive feedback formula low-frequency sound generator described, but any other low frequency wave generator all can be used for the present invention.
Form one 90 ° sweep 13 at the other end of resonator 10, and diffuser 14 of termination, sweep and diffuser form the part of quarter-wave resonance device.Diffuser is surrounded by the air cover 15 of the tangential inlet with compression and combustion air (16).Annular flange 17 with the air cover installs to 18 outsides, boiler wall shown in Figure 1 with burner, and the outlet of diffuser 14 approximately flushes with the inner surface of wall 18.Around diffuser (14) outlet, air cover 15 forms ring exit, thereby the combustion air in the air cover 15 has formed an annular screen around the resonator port of export.Blade 19 is contained on the annular opening, so that form at interval a lot between air cover and diffuser.The central axis of the longitudinal axis of these blades 19 and diffuser rotates round the axis that spreads so that make by the combustion air of air cover 15 by the ring exit discharge at an angle as shown in Figure 3.
Guide pipe 20 extends through sweep 13 along the axis of diffuser 14, and is contained in the sweep by means of supporting 21.
The jet pipe 22 of a supply flow fluid fuel can be contained in the guide pipe 20, so that axially regulate at it with changing.
In an illustrated embodiment, be provided with a jet pipe 22 of carrying fine coal, this jet pipe 22 is arranged on the port of export of resonator, and its opening is positioned at diffuser, and bullet 23 is contained on the jet pipe 22 by means of support 24, and its top is towards the inner chamber of jet pipe 22.Root at bullet 23 is equipped with annular flange 25, like this, fine coal by the jet pipe conveying, bring in the jet pipe by compressed air, fine coal will turn by bullet 23 and coupled flange 25, be haply along it radially towards the excircle of diffuser 14, jet pipe 22 can be in its axial adjustment, so that get in the optimum position that fuel is supplied in the diffuser.
In order to supply with other forms of fluid fuel, for example powder mud coal, wood powder, coal water slurry, other contain slurry, other slurries, oil or the gas of coal, the port of export of jet pipe 22 can be arranged to be different from this disclosed form.Under the situation of using fine coal, fuel is supplied with and is realized by means of being diffused in airborne compressed air.The air capacity of supplying with fuel is replenished by the air capacity that is used to operate vibrator 11 by resonator 10.Other combustion air is supplied with by inlet 16; Passing through its ring exit through air cover 15 discharges.
Preferably the resonator 10 of low frequency generator is a quarter-wave and with its basic audio frequency work, and peak frequency is 60 hertz (Hz), and is best, and peak frequency is 30Hz; Yet, 20Hz or be best more for a short time.Jet pipe 22 is to regulate like this, even the supply of fuel is created in the optimum position of diffuser 14.Therefore, at the resonator opening part, the fluid particles of supply and air and other gases have produced reciprocating motion under the influence of sound wave, and this motion has increased the burning of fuel.
Have been found that when the fuel of supplying with is subjected to low-frequency sound wave at the opening part of tubular resonators and do the time spent, will burn rapidly, and when excessive combustion air seldom the time, the content of unburned particle is also very low in the flue gas.The flame that comes out from burner need change over oil-fired boiler the burning pulverized coal boiler like this than the weak point of conventional burners, is very favourable.Above situation can illustrate by the curve map among Fig. 4.Horizontal axis is represented the axial length of diffuser 14 among the figure, and the radial distance of diffuser center line is left in the vertical axis representative.More than trunnion axis, expression be combustion oil the time, not by means of the thermoisopleth that low-frequency sound wave activation is provided, below trunnion axis, expression be combustion oil the time, according to the thermoisopleth that the invention provides the low-frequency sound wave activation.Can see that by figure the length of flame that the sound wave activation is provided is in fact than the weak point that does not have the sound wave activation.Can find that also when the end connected a diffuser, the part of flame was drawn in the resonator, this has also promoted the shortening of flame.By seeing in the curve map, because the sound wave activation, the increase in temperature of flame root, still, owing to be subjected to the cooling of the combustion air supplied with by the air cover, diffuser can can't help to stand high like this temperature under the situation that special heat proof material makes.In order to obtain maximum efficient by the present invention, the all-bottom sound generator is chosen such that to be that the length of flame is less than 1/4th wave length of sound.
The content of also finding nitrogen oxide in the flue gas is than low under the situation that does not have the sound wave activation, and it is another advantage that obtains by low-frequency sound wave.
Claims (10)
1, a kind of method of burning fluid fuels, wherein fuel is spread in the combustion air, combustion air and the fuel particle that sprays in the combustion air are subjected to the low-frequency sound wave effect that is produced by low-frequency sound generator and produce reciprocating motion, it is characterized in that described low-frequency sound wave acoustical generator includes a tubular resonators with an openend and a closed end, described low-frequency sound wave acoustical generator is with the basic sound wave work of resonator, and peak frequency is 60 hertz; Combustion air is supplied with by described tubular resonators, and fuel is by being contained in the tubular resonators and the feedway supply of opening within it; Combustion air mixes in the open end near described resonator with fuel, and the particle velocity of the low-frequency sound wave at this place is roughly the highest.
2, method according to claim 1 is characterized in that making at least the resonator of a part of combustion air by the low-frequency sound wave acoustical generator.
3, method according to claim 2 is characterized in that another part combustion air supplies with the form around the annular screen of described resonator openend.
4, method according to claim 3 is characterized in that forming the axis rotation of the combustion air of described screen round the resonator openend.
5, method according to claim 1, the frequency that it is characterized in that described low-frequency sound wave acoustical generator are that what to select like this is that the length of flame is less than 1/4th wave length of sound.
6,, it is characterized in that adopting the low-frequency sound wave acoustical generator of positive feedback formula as described low-frequency sound wave acoustical generator according to the described method of any claim among the claim 1-5.
7, a kind of device of implementing the described method of claim 1, this device comprises a low-frequency sound wave acoustical generator (10 with tubular resonators (10), 11) and a fluid fuel feedway, this fuel is spread in the combustion air, it is characterized in that described tubular resonators has an openend and a blind end; The length of described resonator (10) is the quarter-wave of the sound wave that sends, and its basic audio frequency is maximum 60 hertz; The openend of described resonator (10) is provided with a diffuser (14) that constitutes the part of this resonator; Combustion air is supplied with by described resonator, and the opening of described feedway is arranged in the inner chamber of described diffuser (14).
8, device according to claim 7 is characterized in that described fuel supply system upwards is adjustable at the axis of diffuser (14).
9, device according to claim 8 is characterized in that diffuser (14) is surrounded by the air cover (15) that is used to supply with combustion air, and this air cover (15) goes out ring exit of interruption-forming around diffuser.
10, device according to claim 9 is characterized in that blade (19) is arranged on the described ring exit, the central axis of the longitudinal axis of these blades and diffuser (14) in space law line projection at an angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85101521 CN1012988B (en) | 1985-04-01 | 1985-04-01 | The method and apparatus of burning fluid fuels |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85101521 CN1012988B (en) | 1985-04-01 | 1985-04-01 | The method and apparatus of burning fluid fuels |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85101521A CN85101521A (en) | 1987-01-17 |
| CN1012988B true CN1012988B (en) | 1991-06-26 |
Family
ID=4791891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85101521 Expired CN1012988B (en) | 1985-04-01 | 1985-04-01 | The method and apparatus of burning fluid fuels |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1012988B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175033B (en) * | 2010-12-17 | 2013-04-10 | 华北电力大学（保定） | Ultrasonic wave coal granule resonance burning optimization technique and device |
| CA2980285C (en) | 2015-03-19 | 2024-06-18 | University Of Maryland, College Park | Systems and methods for anti-phase operation of pulse combustors |
| CA2980280C (en) | 2015-03-19 | 2024-01-16 | North American Wave Engine Corporation | Systems and methods for improving operation of pulse combustors |
| WO2017106689A1 (en) * | 2015-12-18 | 2017-06-22 | North American Wave Engine Corporation | Systems and methods for air-breathing wave engines for thrust production |
| CN105673253B (en) * | 2016-01-14 | 2017-06-20 | 北京理工大学 | A kind of burner for studying metallic particles hugging characteristic |
| US11585532B2 (en) | 2018-04-17 | 2023-02-21 | North American Wave Engine Corporation | Method and apparatus for the start-up and control of pulse combustors using selective injector operation |
-
1985
- 1985-04-01 CN CN 85101521 patent/CN1012988B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85101521A (en) | 1987-01-17 |
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