OA11815A - Pulsed combustion device and method. - Google Patents
Pulsed combustion device and method. Download PDFInfo
- Publication number
- OA11815A OA11815A OA1200100176A OA1200100176A OA11815A OA 11815 A OA11815 A OA 11815A OA 1200100176 A OA1200100176 A OA 1200100176A OA 1200100176 A OA1200100176 A OA 1200100176A OA 11815 A OA11815 A OA 11815A
- Authority
- OA
- OAPI
- Prior art keywords
- combustion chamber
- oxidant
- chamber
- pulsed
- combustion
- Prior art date
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims description 13
- 239000007800 oxidant agent Substances 0.000 claims abstract description 24
- 230000001590 oxidative effect Effects 0.000 claims abstract description 24
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 22
- 239000000446 fuel Substances 0.000 claims abstract description 16
- 239000012530 fluid Substances 0.000 claims abstract description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 40
- 239000003345 natural gas Substances 0.000 claims description 12
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000003079 shale oil Substances 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims 1
- 230000001939 inductive effect Effects 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 239000000567 combustion gas Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000001172 regenerating effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005094 computer simulation Methods 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C15/00—Apparatus in which combustion takes place in pulses influenced by acoustic resonance in a gas mass
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/02—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones using burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F1/00—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped
- F04F1/06—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped the fluid medium acting on the surface of the liquid to be pumped
- F04F1/16—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped the fluid medium acting on the surface of the liquid to be pumped characterised by the fluid medium being suddenly pressurised, e.g. by explosion
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
A pulsed combustion device (1) for used in an underground borehole comprises a substantially tubular combustion chamber (10) and separate fuel and oxidant supply conduits (2, 6) for supplying fuel and oxidant to the combustion chamber. One of said conduits has a fluid discharge port equipped with return flow limitation means (13) located at the upstream end of the chamber and the combustion chamber is shaped as a Helmholz resonator having a tailpipe section (15) of which the internal diameter is significantly smaller than the other parts of the combustion chamber.
Description
iiai5
PULSED COMBUSTION DEVICE AND METHOD
Background of the Invention
The invention relates to a pulsed combustion deviceand method of using such a device.
Pulsed combustion devices are known, for example fromUS patent Nos. 2,899,287; 2,860,484 and 5,044,930, fromEuropean patent Nos. 550401 and 636229 and fromInternational patent application PCT/EP93/00961.
The known devices generally comprise a combustionchamber having an open downstream end and an upstream endwhich is periodically closable by a one-way valve.
European patent No. 636229 and International patentapplication PCT/EP93/00961 disclose downhole pulsedcombustor devices that hâve cylindrical combustionchambers into which small quantifies of air areperiodically injected to ignite a fraction of the volumeof natural gas in the chamber so as to enhance the flowof natural gas to the wellhead. A disadvantage of these known devices is that theyrequire complex procedures to start up and control thepulsed combustion process and that they hâve a rather lowpumping efficiency.
The pulsed combustion device disclosed in US patentNo. 2,860,484 can be used to generate driving and/or heatenergy. The known device comprises a tubular combustionchamber having an upstream end which is equipped with anon-return valve and an open downstream end which definesa tailpipe section which is slightly narrower than therest of the combustion chamber. The combustion chamber isarranged co-axially within a tube in which another non-return valve is arranged upstream of the combustionchamber. The second non-return valve is closed 2 4 118 15 periodically by high pressure fronts which are reflectedfrom the downstream end of the combustion chamber backthrough the annulus surrounding the chamber. The presenceof two non-return valves which must open and closesequentially is not attractive for downhole use sincevarying wear, friction and pollution of the valves caneasily resuit in an incorrect and out of phase openingand/or closing of the two valves which may eventuallyresuit in stalling of the device. US patent No. 2,899,287 discloses a pulsed combustorwhich comprises either a single tubular combustionchamber or two parallel tubular combustion chambers. Ineach case each combustion chamber has an open tailpipehaving a slightly sinaller internai diameter than the restof the combustion chamber and a fuel injection pump whichinjects accurately defined quantifies of fuel into eachcombustion chamber to control the combustion process.
If the known device has a single combustion chamberthen it is equipped with a mechanical non-return valveand if it has two parallel combustion chambers then it isequipped with a pair of aerodynamic non-return valves.These aerodynamic valves comprise U-shaped regenerativetube Systems, which hâve an inlet close to the downstreamend of the combustion chamber and which convey combustiongas pressure puises back to the inlet and which tend toadjust themselves into phase-opposition. A disadvantage of the pulsed combustor known fromUS patent 2,899,287 is that it is not suitable fordownhole use since it is not feasible to install downholea fuel injection pump which remains stable over a periodof several years and there is no room available toinstall two parallel combustion chambers with associatednon-return valves and a U-shaped regenerative tubeSystem. 1 1 A 1 5 '
French patent No. 1252585 discloses anotheroscillating heating device with a Helmholz oscillator anda U-shaped regenerative tube between the downstream andthe upstream end of the combustion chamber, which is notsuitable for use in a well because of the lack of spaceavailable for such a U-shaped regenerative tube.
It is an object of the présent invention to provide apulsed combustion device and method which are able tooperate safely and efficiently under varying downholeconditions and which comprise a minimum of wêar pronecomponents so that only minimal maintenance andinspection is required.
Summary of the Invention
The pulsed combustion device according to theinvention thereto comprises a substantially tubularcombustion chamber having an upstream and a downstreamend, separate fuel and oxidant supply conduits forsupplying fuel and oxidant to the combustion chamber, oneof said conduits having a fluid discharge port debouchinginto the combustion chamber between the upstream anddownstream ends thereof, the other of said conduitshaving a fluid discharge port located at the upstream endof the chamber which discharge port is equipped withreturn flow limitation means which limit flow ofcombustion fluids from the combustion chamber into thefluid supply conduit and wherein the combustion chamberis shaped as a Helmholz resonator having a tailpipesection near the downstream end of which the smallestcross-sectional area is between 0.15 and 0.30 times theaverage cross-sectional area of the other parts of thecombustion chamber.
It has been found that by properly shaping the combustion chamber as a Helmholz resonator the pulsed combustor device becomes self-aspiring and discharging without requiring a U-shaped regenerative tube. 11815 '
Preferably the tailpipe and the other parts of thecombustion chamber hâve a cylindrical or conical shape.
Experiments revealed that the above combustionchamber geometry is optimal since it transmits asignificant part of the pressure fluctuations from insidethe combustion chamber to the outlet of the tailpipewithout destroying the puise combustion process.
If the pulsed combustor accbrding to the invention isused to compress natural gas downhole in a gas productionwell then it preferably is installed inside a productiontubing by means of a pair of expandable packers and airor another oxidant such as oxygen is fed to the devicevia a supply conduit in the casing-tubing annulus, whichconduit is connected to an orifice in the productiontubing which is located between the two packers. The airor oxidant is then allowed to flow into the combustionchamber from the annular space between the packers via anoxidant supply port which débouchés into the combustionchamber between the upstream and downstream end thereof.
In that case it is preferred that the return flowlimitation means comprise one or more flapper-typedischarge or non-return valves.
Alternatively, the pulsed combustor device accordingto the invention is used to heat the undergroundformation which surrounds the wellbore in which one ormore pulsed combustion devices are operated.
In that case the method according to the inventioncomprises feeding fuel and oxidant to each pulsedcombustor device via fuel and oxidant supply conduitswhich extend from the wellhead into the well andrepeatedly allowing in each pulsed combustor device the 5 1 113 15 oxidant to react with a fraction of the fuel fed into thecombustion chamber thereby generating a high pressurewave front which is inhibited at the upstream end of eachcombustion chamber by the return flow limitation meansand which is enhanced at the downstream end of saidchamber by the tailpipe section. At the downstream end ofthe tailpipe section the high pressure wave front isreflected and followed by a low pressure wave front whichinduces oxidant and fuel to flow into the combustionchamber.
It is preferred that the return flow limitation meansof the heater device comprise one or more aerovalveswhich do not comprise any movable parts or a regenerativetube System extending between the downstream and upstreamends of the combustion chamber.
Preferably a string of pulsed combustor devices issuspended from the wellhead from the oxidant and fuelsupply conduits such that the devices are axially spacedin the well.
Such a string of axially spaced pulsed combustiondevices is particularly suitable to heat undergroundshale or heavy oil réservoirs such that the réservoirtempérature in the région of the wellbore is between 600and 800 K.
Experiments hâve revealed that the pulsed combustordevice is able to operate in a stable manner at such hightempératures over periods of many years and provides acost-effective alternative to existing electrical andcatalytic flameless combustion downhole heating devices.Brief description of the drawings
The invention will be described in more detail withreference to the accompanying drawings in which:
Fig. 1 is a longitudinal sectional view of a pulsedcombustor device according to the invention in aproduction tubing of a natural gas production well; 11815^
Fig. 2 is a longitudinal sectional view of two pulsedcombustor devices according to the invention which areused to heat an underground formation; and
Fig. 3 is a graph in which the fraction of combustedmethane is plotted against the ratio Αγ/Aç between theminimum cross-sectional areas of the tail pipe and otherparts of the combustion chamber.
Detailed Description of the Invention
Referring to Fig. 1 there is shown a pulsed combustordevice 1 which is located in a production tubing 2 in anatural gas production well 3 which traverses anunderground formation 4.
The pulsed combustor device 1 is sealingly securedinside the production tubing 2 by means of a pair ofexpandable packers 5.
Air or another oxidant, represented in the drawing asOg, is fed to the device 1 via an air supply tube 6 whichextends from the wellhead (not shown) through thetubing/casing annulus to an orifice 7 in the tubing 2between the packers 5.
The air flows from the orifice 7 via annular spaces 8to a sériés of air discharge ports 9 which debouch into acombustion chamber 10 of the device 1 at a locationbetween an upstream end 11 and a downstream end 12 ofsaid chamber 10. A sériés of flapper-type discharge or non-returnvalves 13 is arranged at the upstream end 11 of thecombustion chamber 10 which valves allow natural gas,represented in the drawing as CH4, to flow from theproduction tubing 2 below the device into the combustionchamber 10, but which prevent natural gas and/orcombustion products, represented in the drawing as COg +H2O to flow back from the combustion chamber 10 into theproduction tubing 2 below the device 1. 118 15
In accordance with the présent invention thecombustion chamber 10 is shaped as a Helmholz resonatorwherein the chamber 10 is provided with a narrow andelongated tailpipe 15 which has a smallest diameter D-p,which preferably is between 0.3 and 0.5 times the averagediameter Dc of the cylindrical lower part of thecombustion chamber. Experiments and computer calculationshâve indicated that this Dg;/Dc ratio is optimal since thehighest pressure fluctuations and the highest massflow ofnatural gas through the device 1 are achieved at lowestfuel consumption as will be explained in more detail withreference to Fig. 3.
The device 1 of Fig. 1 is equipped with a glow plug16 to which electrical power is supplied via a powercable 17. The glow plug 16 is continuously activatedduring operation of the device 1 and is generally notswitched off when the device 1 has reached its normaloperating température since if the device 1 is used as adownhole gas compressor its operating température ismaintained at such a low level that there is nospontaneous combustion of the natural gas.
During normal operation of the device 1 pulsedcombustion takes place in the combustion chamber 10.
The frequency of the pulsed combustion process isdictated by the Helmholz effect and is typically between10 and 50 cycles per second.
During each cycle a high pressure wave front isgenerated which is followed by a low pressure wave front.Both wavefronts are enhanced by the Helmholz effect sothat a maximum amount of natural gas is sucked into thechamber 10 when the low pressure wave front reaches theupstream end thereof and also a maximum amount of naturalgas and combustion gases are pressed via the tailpipe 15through the downstream end of the chamber 10 as a resuitof the high pressure wave front. The divergent shape of 8 118 15 the tailpipe 15 further enhances the mass flow throughthe combustion chamber.
If the device 1 is used as a downhole compressor in anatural gas production well only a relatively smallamount of air or other oxidant, such as pure oxygen, issupplied to the combustion chamber such that less than10% of the natural gas flowing through the productiontubing 2 is combusted. The presence of a small fractionof combustion gases only provides insignificant pollutionof the produced natural gas.
Referring to Fig. 2 there is shown a heat injectionwell 20 which traverses an underground shale or heavy oilbearing formation 21.
In the well 20-à string of pulsed combustion devices22 according to the invention is suspended.
The devices 22 are suspended from a central methaneinjection tube 23 which passes through the centre of eachof the devices 22. An air injection tube 24 is connectedto an air inlet chamber 25 of each device 22 via anorifice 26.
The air inlet chamber 25 is connected to thecombustion chamber 27 via a number of aerovalves 28,which allow air to flow up from the air inlet into thecombustion chamber but which inhibit combustion gas toflow back from the combustion into the air inlet chamber.
During normal operation of the devices 22 methane(CH4) or another fuel is injected via the methaneinjection tube 23 and a sériés of methane discharge ports29 into the combustion chambers 27. At the same time airis injected into the chambers 27 via the aerovalves 28which causes at the elevated température in thecombustion chambers 27 a pulsed combustion process totake place.
If the devices 22 are used as heaters the combustionprocess is only assisted by a glow plug (not shown) 9 during start-up, whereas during normal operation spontaneous combustion of the methane occurs in thecombustion chambers as a resuit of the prevailingpressure and température in the chambers 27.
During each combustion cycle high and low pressurewave fronts develop in the combustion chambers 22 at afrequency which is dictated by the Helmholz effect, whichis induced by the presence of a tailpipe 30 at thedownstream end 31 of each combustion chamber which isrelatively narrow compared to the upstream part 32 ofeach combustion chamber.
In the example shown the cross-sectional area of thetailpipe is represented as Ap and the cross-sectionalarea of the upstream part 32 of the combustion chamber asAC
It will be understood that the cross-sectional areaAjv[ of the methane injection tube 23 at the centre of thedevices 22 does not count as part of the cross-sectionalareas A-p and Aq of the tail pipes and upstream parts 32of the combustion chambers 22. In the example shown theratio Ap>/Ac is selected between 0.15 and 0.25 on thebasis of the following analysis.
Experiments revealed that the onset of thermo-acoustical pulsations in a puise combustor may be studiedby linear analysis of the one-dimensional conservationéquations for mass, momentum and energy. It was foundthat the pulsations get the more damped, a) the larger the gas velocity through the combustionchamber 27 is; b) the shorter the upstream part 32 of the combustionchamber is relative to the length of the tail pipe 30; c) the smaller the diameter of the tail pipe 30 isrelative to that of the upstream part 32 of thecombustion chamber. 10 113 15
On the other hand it has been found that the pressurebuild up in the combustion chamber 27 is the larger, themore closed-off the combustion chamber 27 is. So theremust be an optimum tail pipe diameter at which thehighest pressure fluctuations are achieved.
The standard geometry ratio between the cross-sectional areas of the tail pipe and the other parts ofthe combustion chamber deviates from common dimensions ofpuise combustors in industrial and scientific applications. A set of computer simulations has been doneto investigate whether a change in the cross-sectionalarea ratio Α^/Ας can improve the performance of the puisecombustor. The minimum tail pipe diameter is the onlyparameter that is chànged in these simulations.
The results of these computer simulations andexperiments are shown in Fig. 3.
Fig. 3 shows that an optimal tail pipe cross-sectional area does indeed exist for a given compressionratio at which the combusted fraction of methane isminimal. A minimal methane combustion at a givencompression rate is a clear indication that the pulsedcombustion process performs in an optimal manner. Fig. 3indicates that an optimum Α^/Ας ratio is between 0.15 and 0.25. If the tailpipe and other parts of the combustionchamber are tubular and hâve an open centre as shown inFig. 1. then the ratio between their diameters ϋψ/Dcshould be between 0.3 and 0.5. The chosen diameter forthe standard geometry is in both cases reasonably closeto the optimal diameter. Nevertheless, for a compressionratio of 1.15 the massflow can be increased by 20% bychoosing a somewhat broader tail pipe.
Also for the heater assembly shown in Fig. 2 it isimportant to hâve an optimal compression ratio since thisensures a stable operation of the device 22. 11 118 15
The string of devices 22 may extend along the entiredepth of the shale oil formation. If required the heatinjection well 20 may be inclined or horizontal and maybe an open or a cased hole.
Claims (10)
12 118 15 C L A I M S
1. A pulsed combustion device (1,22) for use in anunderground borehole (3,20), the device comprising asubstantially tubular combustion chamber (10,27) havingan upstream (11) and a downstream end (12), separate fueland oxidant supply conduits (2,23,6,24) for supplyingfuel and oxidant to the combustion chamber, one of saidconduits having a fluid discharge port (9,29) debouchinginto the combustion chamber between the upstream anddownstream ends (11,12) thereof, the other of saidconduits (2,24) having a fluid discharge port located atthe upstream end (11) of the chamber (10,27), whichdischarge port is equipped with return flow limitationmeans (13,28) which limit flow of combustion fluids fromthe combustion chamber (10,27) into the fluid supplyconduit (2,24) and wherein the combustion chamber isshaped as a Helmholz resonator having a tailpipe section(15,30) near the downstream end (12) of which thesmallest croes-sectional area is between 0.15 and 0.30 times the average cross-sectional area of the otherparts of the combustion chamber (10,27) .
2. The pulsed combustion device of claim 1 wherein thetailpipe (15,30) and the other parts of the combustionchamber (10,27) hâve a cylindrical or conical shape.
3. The pulsed combustor device of claim 2 wherein thetailpipe (15,30) has a tapered divergent conical shapeand the other parts of the combustion chamber (10,27)hâve a substantially cylindrical shape.
4. The pulsed combustor device of claim 1 wherein thereturn flow limitation means comprise one or moredischarge or non-return valves (13) . 118 15 13
5. The pulsed combustor device of claim 1 wherein thereturn flow limitation means comprise one or moreaerovalves (28) which do not hâve movable parts.
6. A method of enhancing fluid flow in a natural gasproduction well (3), the method comprising installing apulsed combustor device (1) according to claim 4 in thewell production tubing (2) such that a seal (5) iscreated between the outer surface of the combustionchamber (10) and the inner surface of the productiontubing (2), injecting an oxidant through the supplyconduit (6) which has a fluid discharge port (9) whichdébouchés into the combustion chamber (10) between theupstream and downstream ends (11,12) thereof, allowingthe oxidant to react'with a fraction of the natural gasprésent in the combustion chamber (10) thereby generatinga high pressure wave front which is inhibited at theupstream end of the combustion chamber by the return flowlimitation means (13) and which is enhanced at thedownstream end (12) of the combustion chamber by thetailpipe section (15) thereby inducing the mixture andcombustion gases to flow up through the productiontubing (2), which high pressure wave front is followed bya low pressure wave front which induces natural gas toflow into the combustion chamber via the return flowlimitation means (13).
7. A method of heating an underground formation, themethod comprising lowering into a well (30) traversingthe formation (21) at least one pulsed combustordevice (22) according to claim 1 into the well, feedingfuel and oxidant to each pulsed combustor device via fueland oxidant supply conduits (23,24) which extend from thewellhead into the well and repeatedly allowing in eachpulsed combustor device (23,24) the oxidant to react witha fraction of the fuel fed into the combustion chamber (27) thereby generating a high pressure wave 14 118 15 front which is inhibited at the upstream end of eachcombustion chamber by the return flow limitationmeans (28) and which is enhanced at the downstream end ofsaid chamber by the tailpipe section (30), which highpressure wave front is followed by a low pressure wavefront which induces oxidant and fuel to flow into thecombustion chamber (27).
8. The method of claim 7 wherein a string of pulsedcombustor devices (22) is suspended from the wellheadfrom the oxidant and fuel supply conduits (23,24) suchthat the devices (22) are axially spaced in the well (20).
9. The method of claim 8 wherein fuel in the form ofmethane is fed to each of the devices via a methanesupply conduit (23) which passes through the centre ofthe combustion chamber (27) and tailpipe (30) of at leastone pulsed combustor device (22) and methane is injectedinto the combustion chamber of each device via a methanedischarge port (29) located between the upstream anddownstream ends of the chamber (27) whereas oxidant issupplied via an oxidant discharge port (26) at theupstream end of the combustion chamber (27).
10. The method of claim 7 wherein the underground formation (21) contains shale oil and the pulsed combustor devices (22) are operated such that the shaleoil containing formation (21) in the région of thewell (20) is between 600 and 800 K.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP98310784 | 1998-12-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| OA11815A true OA11815A (en) | 2005-08-16 |
Family
ID=8235233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| OA1200100176A OA11815A (en) | 1998-12-30 | 1999-12-29 | Pulsed combustion device and method. |
Country Status (18)
| Country | Link |
|---|---|
| EP (1) | EP1141629B1 (en) |
| CN (1) | CN1158472C (en) |
| AR (1) | AR023360A1 (en) |
| AT (1) | ATE276481T1 (en) |
| AU (1) | AU747930B2 (en) |
| BR (1) | BR9916720A (en) |
| CA (1) | CA2356425C (en) |
| DE (1) | DE69920269D1 (en) |
| EA (1) | EA002434B1 (en) |
| GC (1) | GC0000118A (en) |
| HU (1) | HUP0104947A3 (en) |
| ID (1) | ID29049A (en) |
| IL (1) | IL143926A0 (en) |
| NO (1) | NO321554B1 (en) |
| NZ (1) | NZ512564A (en) |
| OA (1) | OA11815A (en) |
| TR (1) | TR200101890T2 (en) |
| WO (1) | WO2000040898A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104595928B (en) * | 2015-01-23 | 2020-02-14 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | Acoustic flame tube of diffusion combustion chamber |
| CN109945189B (en) * | 2019-03-20 | 2023-09-05 | 中国矿业大学 | Low-concentration gas pulsation burner with improved main pipe |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1252585A (en) * | 1960-04-04 | 1961-01-27 | Egerspacher J | Turbine installation, in particular heating device, comprising an oscillating burner |
| US5059404A (en) * | 1989-02-14 | 1991-10-22 | Manufacturing And Technology Conversion International, Inc. | Indirectly heated thermochemical reactor apparatus and processes |
| JP2726487B2 (en) * | 1989-03-31 | 1998-03-11 | 株式会社東芝 | Pulse burner |
| DE69315829T2 (en) * | 1992-04-22 | 1998-04-09 | Shell Int Research | METHOD AND DEVICE FOR COMPRESSING A FLAMMABLE GAS FLOWING A PIPE |
-
1999
- 1999-12-23 AR ARP990106720A patent/AR023360A1/en not_active Application Discontinuation
- 1999-12-25 GC GCP1999463 patent/GC0000118A/en active
- 1999-12-29 DE DE69920269T patent/DE69920269D1/en not_active Expired - Lifetime
- 1999-12-29 EA EA200100724A patent/EA002434B1/en not_active IP Right Cessation
- 1999-12-29 NZ NZ512564A patent/NZ512564A/en unknown
- 1999-12-29 EP EP99968404A patent/EP1141629B1/en not_active Expired - Lifetime
- 1999-12-29 CA CA002356425A patent/CA2356425C/en not_active Expired - Fee Related
- 1999-12-29 HU HU0104947A patent/HUP0104947A3/en unknown
- 1999-12-29 BR BR9916720-4A patent/BR9916720A/en active Search and Examination
- 1999-12-29 WO PCT/EP1999/010499 patent/WO2000040898A1/en active IP Right Grant
- 1999-12-29 ID IDW00200101409A patent/ID29049A/en unknown
- 1999-12-29 AU AU25405/00A patent/AU747930B2/en not_active Ceased
- 1999-12-29 TR TR2001/01890T patent/TR200101890T2/en unknown
- 1999-12-29 AT AT99968404T patent/ATE276481T1/en not_active IP Right Cessation
- 1999-12-29 CN CNB998152803A patent/CN1158472C/en not_active Expired - Fee Related
- 1999-12-29 OA OA1200100176A patent/OA11815A/en unknown
- 1999-12-29 IL IL14392699A patent/IL143926A0/en unknown
-
2001
- 2001-06-29 NO NO20013261A patent/NO321554B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO2000040898A1 (en) | 2000-07-13 |
| CN1158472C (en) | 2004-07-21 |
| GC0000118A (en) | 2005-06-29 |
| AU2540500A (en) | 2000-07-24 |
| NO321554B1 (en) | 2006-05-29 |
| CA2356425A1 (en) | 2000-07-13 |
| HUP0104947A3 (en) | 2002-05-28 |
| ID29049A (en) | 2001-07-26 |
| DE69920269D1 (en) | 2004-10-21 |
| BR9916720A (en) | 2001-12-04 |
| HUP0104947A2 (en) | 2002-04-29 |
| ATE276481T1 (en) | 2004-10-15 |
| AU747930B2 (en) | 2002-05-30 |
| AR023360A1 (en) | 2002-09-04 |
| EA002434B1 (en) | 2002-04-25 |
| EP1141629A1 (en) | 2001-10-10 |
| EA200100724A1 (en) | 2001-12-24 |
| NO20013261D0 (en) | 2001-06-29 |
| NZ512564A (en) | 2002-12-20 |
| EP1141629B1 (en) | 2004-09-15 |
| IL143926A0 (en) | 2002-04-21 |
| TR200101890T2 (en) | 2001-11-21 |
| CN1332836A (en) | 2002-01-23 |
| CA2356425C (en) | 2009-01-27 |
| NO20013261L (en) | 2001-08-22 |
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