EP0161141A1 - Dispositif d'alimentation d'une chambre de combustion pulsatoire en carburant et en comburant - Google Patents

Dispositif d'alimentation d'une chambre de combustion pulsatoire en carburant et en comburant Download PDF

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Publication number
EP0161141A1
EP0161141A1 EP85400605A EP85400605A EP0161141A1 EP 0161141 A1 EP0161141 A1 EP 0161141A1 EP 85400605 A EP85400605 A EP 85400605A EP 85400605 A EP85400605 A EP 85400605A EP 0161141 A1 EP0161141 A1 EP 0161141A1
Authority
EP
European Patent Office
Prior art keywords
oxidant
fuel
channels
injecting
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP85400605A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jean-Marc Bader
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Societe National Elf Aquitaine
Societe Nationale Elf Aquitaine Production SA
MAREK BV
Mareck BV
Original Assignee
Societe National Elf Aquitaine
Societe Nationale Elf Aquitaine Production SA
MAREK BV
Mareck BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Societe National Elf Aquitaine, Societe Nationale Elf Aquitaine Production SA, MAREK BV, Mareck BV filed Critical Societe National Elf Aquitaine
Publication of EP0161141A1 publication Critical patent/EP0161141A1/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • the present invention relates to a device for supplying a pulsating combustion chamber with fuel and with oxidant.
  • the pulsed combustion of a mixture of oxidant and fuel in a chamber requires the introduction into this chamber of the mixture intermittently.
  • the fuel can be introduced continuously and the oxidant alternatively or the two components can be mixed and the mixture introduced sequentially.
  • the device according to the invention makes it possible to inject the fuel in a continuous manner and to inject the oxidant sequentially.
  • the choice of continuous injection of fuel raises certain problems which may be incompatible with the long-term use of the pulsating combustion chamber. .
  • the propensity for fouling of the supply device is mainly due to the time intervals during which the air is not injected, the combustion of the fuel takes place in the absence of air.
  • the air jet introduced is practically vertical. There is therefore a neutral point between the vertical and descending movement of the air and its vertical and ascending movement which precedes the closing of the valves. During this neutral point, which occurs twice per cycle, the walls of the chamber in which the mixing takes place are no longer swept by the gas mixture, which is conducive to fouling.
  • the means for injecting the oxidant comprise at least two channels for injecting the oxidant emerging through said valves in an annular manifold which comprises at least one upper wall and one lower wall and at least part of which from the bottom wall has a shape converging towards said intermediate channel, said channels for injecting the oxidant being inclined relative to the axis of the fuel injection means so that the oxidant is imparted a continuously accelerated vortex movement under the combined action of the shape of the manifold and the inclination of said fuel injection channels.
  • the fuel injection means consists of an injection head located entirely inside the manifold. This preferably opens out at the upper level of the intermediate chamber.
  • Figure 1 is a partial sectional view of a device (1) according to the invention. It consists of a body (2) mounted on the neck (3) of a chamber (4) of pulsed combustion.
  • the body (2) has two parts, an upper plate (5) and a valve holder part (6). These two parts are parts of revolution, symmetrical about an axis (8).
  • the upper plate (5) is fitted into a casing (9) which defines with it a chamber (10) for the admission of air. It has a central bore (13) threaded and bores such as (12).
  • the bores (12) are cylindrical and their axes are inclined relative to the axis of revolution (8) and relative to the diametrical planes of the plate as will appear later.
  • the plate (5) is provided with a large central bore (20).
  • the bottom (21) of this bore has the shape of a surface of revolution (22) whose section through a diametral plane is rounded and of a conical surface (23) in extension of the surface of revolution (22).
  • the valve holder part (6) has a central bore (30) comprising a conical part (31), a flared and converging part (32) and a wall (33).
  • the curvature of the part (32) is circular and the wall (33) of the bore (30) is vertical in the immediate vicinity (34) of a bore (45).
  • the central bore (30) defines with the upper wall of the part (6) a circular step (37) resting on the flat surface (23).
  • the valve holder part is fixed to the neck (3) by a series of five bolts such as (40) and comprises a pair of ignition electrodes (41) and (42).
  • the device (1) is held in place on the neck (3) by means of threaded tie rods (75) which are screwed into nuts (77) welded on a support place (76) itself welded to, collar (3).
  • tie rods (75) which are screwed into nuts (77) welded on a support place (76) itself welded to, collar (3).
  • all the parts are metallic, except the valve holder part which is made of a plastic material having good qualities of resistance to thermal transfers by convection.
  • the device thus represented operates in the following manner.
  • a conventional step of initiating pulsatory combustion is carried out and for this the air is injected through the bores (12) into the manifold (100).
  • This manifold (100) is defined by the wall (21) of the bore (20), the walls (31), (32) and (33) of the bore (30) and by the bore (45).
  • This injection is made using a fan not shown.
  • the combustion is initiated by a high voltage ignition produced by the electrodes (41) and (42).
  • the valves (90) close the injection ports (12).
  • the fan is used until the pulsating combustion cycle is fully established. In steady state, the electrodes are no longer used.
  • the fuel is injected continuously by a nozzle or injection head (115) which is screwed into the bore (11).
  • the spray cone of the injection is such that the impact of the drops of fuel takes place mainly below the bore (45), that is to say in the intermediate channel, corresponding to the inside the neck (3).
  • the vortex movement of the air is maintained throughout the manifold as well as in the intermediate channel.
  • the intermediate channel constitutes the zone for mixing the fuel and the oxidizer, although it is obviously very possible that part of the mixture already takes place in the lower zone of the manifold or, on the contrary, in the combustion (4).
  • the injected air always remains in motion even if the vertical component of its speed changes direction since the tangential component will never be zero.
  • the lower wall of the collector (100) will always be swept and cooled by a stream of air.
  • This favorable effect is further improved by the small volume of the manifold and therefore by the small mass of air capable of being compressed by the ascent of the burnt gases.
  • the low volume of the collector is mainly due to the converging shape of its lower wall. This volume can be further reduced by modifying the shape of the upper wall.
  • valve holder part was made of a thermally insulating material. This has the effect of limiting the heating of the injection head. But we can also plan to make this piece of metal and interpose between it and the intermediate channel an insulating disc which will then prevent heat transfers upwards, the insulating disc extending over the entire height of the '' bore (45).
  • the valve (90) consists of a flat ring (120), deformable, of width greater than the width of the bores (12). It is held in place between the bottom (21) of the bore (20) and the conical wall (31) of the valve-holder part (6) on which it is supported by its outside diameter.
  • the height of the circular step (37) is greater than the thickness of the flat ring so that the latter can move between a low position corresponding to the opening of the valve and a high position corresponding to its closing.
  • the wall (31) has a conical shape at the level of the ring, the underside of the latter is never completely pressed against the wall (31). The increase in pressure inside the manifold (100) is therefore transmitted to the underside of the ring, which causes the valve to close.
  • valves represented in FIGS. 4 and 5 proceed from another principle since they are individual valves (130) produced in the form of pellets (131) which are movable in translation inside centering pads (132 ), (133) and (134) fixed to the plate (5) by being mounted in force in blind bores.
  • the wall (31) of the valve-holder part (6) is horizontal opposite the pellets (131).
  • a groove (135) is made in the valve-holder part (6) opposite each valve. As is more particularly visible in FIG. 5, the groove is oriented along an axis (150) which is symmetrical with the axis (110) with respect to the diameter (111).
  • the bore (12) can be replaced by a series of coaxial bores (140), each having the same orientation as that defined for the axes (12) with reference to FIG. 2. This solution improves the tightness of the valves.
  • the bore (45) shown is divergent towards the intermediate channel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
EP85400605A 1984-03-29 1985-03-28 Dispositif d'alimentation d'une chambre de combustion pulsatoire en carburant et en comburant Withdrawn EP0161141A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8404921A FR2562212B1 (fr) 1984-03-29 1984-03-29 Dispositif d'alimentation d'une chambre de combustion pulsatoire en carburant et en comburant
FR8404921 1984-03-29

Publications (1)

Publication Number Publication Date
EP0161141A1 true EP0161141A1 (fr) 1985-11-13

Family

ID=9302597

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85400605A Withdrawn EP0161141A1 (fr) 1984-03-29 1985-03-28 Dispositif d'alimentation d'une chambre de combustion pulsatoire en carburant et en comburant

Country Status (3)

Country Link
EP (1) EP0161141A1 (enExample)
JP (1) JPS60253707A (enExample)
FR (1) FR2562212B1 (enExample)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE878551C (de) * 1944-03-14 1953-06-05 Alfred Dipl-Ing Kaercher Rueckstromsperren an einer mit pulsierender Verbrennung arbeitenden Vorrichtung zur Bereitung und Foerderung von Heizgasen
DE970736C (de) * 1950-04-07 1958-10-23 Kaercher Fa Alfred Vorrichtung zur Gemisch-Aufbereitung bei Brennern mit schwingender Gas-Saeule
GB1187477A (en) * 1966-08-19 1970-04-08 Crane Fruehauf Trailers Ltd Vent Check Valve
DE2528671A1 (de) * 1975-06-27 1977-01-13 Kloeckner Humboldt Deutz Ag Brennkammer fuer fluessig- und gastreibstoffe
WO1981001454A1 (en) * 1979-11-15 1981-05-28 Mareck Bv Starting method and device for combustion apparatus
EP0066203A2 (en) * 1981-05-20 1982-12-08 Kabushiki Kaisha Toshiba Pulse combustor
WO1984002762A1 (en) * 1982-12-30 1984-07-19 Mareck Bv Non-return valve for pulsating burners

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE878551C (de) * 1944-03-14 1953-06-05 Alfred Dipl-Ing Kaercher Rueckstromsperren an einer mit pulsierender Verbrennung arbeitenden Vorrichtung zur Bereitung und Foerderung von Heizgasen
DE970736C (de) * 1950-04-07 1958-10-23 Kaercher Fa Alfred Vorrichtung zur Gemisch-Aufbereitung bei Brennern mit schwingender Gas-Saeule
GB1187477A (en) * 1966-08-19 1970-04-08 Crane Fruehauf Trailers Ltd Vent Check Valve
DE2528671A1 (de) * 1975-06-27 1977-01-13 Kloeckner Humboldt Deutz Ag Brennkammer fuer fluessig- und gastreibstoffe
WO1981001454A1 (en) * 1979-11-15 1981-05-28 Mareck Bv Starting method and device for combustion apparatus
EP0066203A2 (en) * 1981-05-20 1982-12-08 Kabushiki Kaisha Toshiba Pulse combustor
WO1984002762A1 (en) * 1982-12-30 1984-07-19 Mareck Bv Non-return valve for pulsating burners

Also Published As

Publication number Publication date
FR2562212B1 (fr) 1988-04-22
JPS60253707A (ja) 1985-12-14
JPH0478884B2 (enExample) 1992-12-14
FR2562212A1 (fr) 1985-10-04

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19850401

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Effective date: 19870107

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Inventor name: BADER, JEAN-MARC