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

• Combustor for pulsating combustion Combustor for pulsating combustion.
• the present invention relates to a combustor for pulsating combustion, having a combustion chamber which at the inlet side is connected with a supply tube for combustion air and a supply tube for fuel and at the outlet side is provided with one or more exhaust tubes for the gasses, as is described in EP-A 157.372.
• the combustion chamber and the in- and outlet tubes are dimensioned in such a way that they form a resonance tube which compares with the periodical
• combustor simply can be adapted to the circumstances without interfering with the construction of the combustor.
• this is obtained by arranging the inlet tubes one into the other, in such a way that between these inlet tubes an annular space is present, whereby the inner tube is movable in axial direction with respect to the outer tube and is provided with a widening at the side facing the combustion chamber, which widening is provided with a collar which abuts against the inside of the outer tube and wherein the wall of the widening and/or the collar is provided with openings for supplying the medium present in the annular space into the combustion chamber.
• the content of the combustion chamber can be altered even when the combustor is in operation. After assembly the combustor in operation can be brought in optimized resonance. The frequency, power output, composition of the exhaust gasses and the kind of fuel can now efficiently be adjusted without changing the construction of the
• the moving parts of the combustor and/or those parts that are subjected to wear are better to be reached for maintenance and/or inspection. They all together can be taken out of the combustor-system in one movement.
• the resonance of the combustor is adjusted by means of adjusting the combustor-head also the content of the fore-space between the tubes changes. This may influence the proportion of the air/fuel ratio in the combustion chamber.
• a disc which is provided with supply openings is axially movable in the space between both tubes. In this way it is possible to adjust the content of this space.
• the combustor comprises a combustion chamber A being a part of the air supply tube B but divided from it by the combustor head C.
• the air valve section E is located in such a way that there is a fore-chamber D between this section and the combustor head.
• the combustor head C consists of the fuel supply tube 1 which is provided with a widening 2 at the side facing the
• the widening has a radial outward situated collar 3. This collar may slide along the inner surface of the air supply tube B. In the wall of the widening 2 openings 4 for the supply of the combustion air from the fore-chamber D to the combustion chamber A are present.
• an axially movable disc 5 is supported by a support not shown in the drawing.
• This disc is fitted with supply openings 6 for the supply of the fuel.
• a spark plug 14 is mounted on this disc. This plug is connected by wires with a power source not shown in the drawing. These wires may be led trough tube 1.
• the air valve section E consists of a sleeve gland 7, a gasket 8, a gland 9, a distance piece 10, a gasket
• the air valve section E may be fastened air tight to tube 1 by means of sleeve gland 7 and the gasket 8.
• the location of this fitting dictates the content of fore-chamber D.
• the distance piece 10 and the gasket 11, disc 12 may be fastened air tight to the air supply tube B.
• the location of this fitting dictates the content of the combustion chamber and also the total content of the resonance system. In this way it is possible to " tune in " the combustor from the outside, without the need to take constructive measures.
• spark plug 14 and the valve section E may be taken out of the outer tube B as if it where one piece.
• the invention is not limited to the example described above.
• the discs 5 and 12 may be equipped with an amount of narrow openings. When the combustion in the combustion chamber takes place, these openings deliver sufficient resistance to limit the pressure rise more or less to the front of these discs. By increasing the width of the openings an increasing portion of the flue gasses of the preliminary combustion will be part of the new mixture. I n this way it is possible to reduce the power output, but also to create a NOx reduction.
• the supply openings in the wall of the widening may be made in the collar as well as any where in the outline of the
• the function of the spark plug or the filament is to start the combustion.
• the power supply of the spark plug or filament might be shut off.
• the described installation preferably works with gaseous or fluid fuels, but solid fuels ( powder ) also can be used.
• the content of a combustion chamber of 500 cm 3 equals a power output of ⁇ 30 kWatt, whereas in a combustion chamber of 040 x 300 cm ⁇ 10 MWatt can be generated.
• the frequency of the combustion cycle mostly vary between 50 and 200 Hz.

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)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19854773

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (2)

Citations (3)

• 1989
  • 1989-06-05 NL NL8901416A patent/NL8901416A/nl not_active Application Discontinuation
• 1990
  • 1990-06-05 ES ES90909188T patent/ES2065534T3/es not_active Expired - Lifetime
  • 1990-06-05 WO PCT/NL1990/000080 patent/WO1990015286A1/en active IP Right Grant
  • 1990-06-05 AT AT90909188T patent/ATE116051T1/de not_active IP Right Cessation
  • 1990-06-05 DK DK90909188.6T patent/DK0429615T3/da active
  • 1990-06-05 DE DE69015328T patent/DE69015328T2/de not_active Expired - Fee Related
  • 1990-06-05 EP EP90909188A patent/EP0429615B1/de not_active Expired - Lifetime

Patent Citations (3)

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