WO1999023418A1 - Ejector nozzle - Google Patents

Ejector nozzle Download PDF

Info

Publication number
WO1999023418A1
WO1999023418A1 PCT/FI1998/000826 FI9800826W WO9923418A1 WO 1999023418 A1 WO1999023418 A1 WO 1999023418A1 FI 9800826 W FI9800826 W FI 9800826W WO 9923418 A1 WO9923418 A1 WO 9923418A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
combustion air
fuel
ejector
mixture
Prior art date
Application number
PCT/FI1998/000826
Other languages
French (fr)
Inventor
Hannu Nikunen
Original Assignee
Ecopower Technology Oy
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 Ecopower Technology Oy filed Critical Ecopower Technology Oy
Priority to AU96310/98A priority Critical patent/AU9631098A/en
Publication of WO1999023418A1 publication Critical patent/WO1999023418A1/en

Links

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 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion

Definitions

  • the present invention relates to an ejector nozzle, intended for discharging a mixture of fuel and primary combustion air out of the nozzle for entraining secondary combustion air on ejector principle.
  • an object of the present invention is to provide an improved ejector nozzle, capable of enhancing the entrainment of secondary combustion air with respect to prior art solutions.
  • an ejector nozzle of the invention is characterized in that the nozzle is provided with an annular outer space for a combustible mixture of fuel and primary combustion air, and with means for feeding the fuel and/or primary combustion air in a direction transverse to the longitudinal axis of the nozzle into said annular space for setting the mixture present in the annular space in a rotating motion.
  • the ejector nozzle of the invention wherein a mixture of fuel and primary combustion air is set in a rotating motion in an annular space by feeding fuel and/or primary combustion air into the annular space in a direction transverse to the longitudinal axis of the nozzle, is capable of achieving a rotating motion more effective than what is achieved by a so-called Vortex-ejector, in which a rotating motion is created by means of blade elements and which is not provided with said annular space.
  • Claim 2 discloses a tubular central space, which is connected to a source of secondary combustion air and which can be used for increasing the total amount of secondary combustion air substantially as compared to the entrainment of secondary combustion air effected only from outside the nozzle.
  • fig. 1 shows one embodiment for an ejector nozzle of the invention in a longitudinal section
  • fig. 2 shows the embodiment of fig. 1 in a frontal view.
  • an ejector nozzle 1 of the invention includes an outer annular space 3, which is supplied with fuel and/or primary combustion air from a duct 2 in a direction transverse to the longitudinal axis of the nozzle for setting the mixture in a rotating motion in the annular space.
  • the mixture of fuel and primary combustion air bums in the annular space 3 and discharges at a high velocity out of the forward end (arrows 5) of the nozzle through an orifice 8.
  • the annular space 3 has a cross-section which is adapted to converge towards the orifice 8 for a higher discharge speed.
  • a tubular central space 4 which is connected to a source of secondary combustion air, e.g.
  • the nozzle 1 is used in such a way that secondary combustion air is entrained both from around the nozzle 1 (arrows 7) and from the central space 4 (an arrow 6).
  • the ejector nozzle of the invention can be used for a variety of applications, such as for producing hot drying air, feeding hor combustion air to a combustion unit, etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)

Abstract

The invention relates to an ejector nozzle (1), intended for discharging a mixture of fuel and primary combustion air out of the nozzle for entraining secondary combustion air on ejector principle. The nozzle (1) of the invention is provided with an annular outer space (3) for a combustible mixture of fuel and primary combustion air, and with means (2) for feeding the fuel and/or primary combustion air in a direction transverse to the longitudinal axis of the nozzle into said annular space (3) for setting the mixture present in the annular space in a rotating motion.

Description

Ejector nozzle
The present invention relates to an ejector nozzle, intended for discharging a mixture of fuel and primary combustion air out of the nozzle for entraining secondary combustion air on ejector principle.
The use of ejector equipment for mixing fuel and combustion air is prior known. An object of the present invention is to provide an improved ejector nozzle, capable of enhancing the entrainment of secondary combustion air with respect to prior art solutions. In order to achieve this object, an ejector nozzle of the invention is characterized in that the nozzle is provided with an annular outer space for a combustible mixture of fuel and primary combustion air, and with means for feeding the fuel and/or primary combustion air in a direction transverse to the longitudinal axis of the nozzle into said annular space for setting the mixture present in the annular space in a rotating motion.
The ejector nozzle of the invention, wherein a mixture of fuel and primary combustion air is set in a rotating motion in an annular space by feeding fuel and/or primary combustion air into the annular space in a direction transverse to the longitudinal axis of the nozzle, is capable of achieving a rotating motion more effective than what is achieved by a so-called Vortex-ejector, in which a rotating motion is created by means of blade elements and which is not provided with said annular space.
Claim 2 discloses a tubular central space, which is connected to a source of secondary combustion air and which can be used for increasing the total amount of secondary combustion air substantially as compared to the entrainment of secondary combustion air effected only from outside the nozzle.
The invention will now be described in more detail with reference made to the accompanying drawings, in which: fig. 1 shows one embodiment for an ejector nozzle of the invention in a longitudinal section, and
fig. 2 shows the embodiment of fig. 1 in a frontal view.
Referring to figs. 1 and 2, an ejector nozzle 1 of the invention includes an outer annular space 3, which is supplied with fuel and/or primary combustion air from a duct 2 in a direction transverse to the longitudinal axis of the nozzle for setting the mixture in a rotating motion in the annular space. The mixture of fuel and primary combustion air bums in the annular space 3 and discharges at a high velocity out of the forward end (arrows 5) of the nozzle through an orifice 8. The annular space 3 has a cross-section which is adapted to converge towards the orifice 8 for a higher discharge speed. Inside the annular space 3 is designed a tubular central space 4, which is connected to a source of secondary combustion air, e.g. to an atmosphere surrounding the ejector. In a normal case, the nozzle 1 is used in such a way that secondary combustion air is entrained both from around the nozzle 1 (arrows 7) and from the central space 4 (an arrow 6). However, it is possible to operate the nozzle the way of a normal ejector nozzle, such that the secondary combustion air is only entrained from around the nozzle, the central space being sealed, or, optionally, it is conceivable to entrain secondary combustion air only through the central space 4.
It has been established by mathematical calculations that the inflow ratio between a secondary flow and a primary flow is about 7 when the secondary flow is only entrained from outside a nozzle. When a central space is also used for feeding the secondary flow, said inflow ratio is about 10-11. In mathematical calculations, the primary feed has been given the following values:
mass flow rate 0,374 kg/s temperature 550 °C density 0,420 kg/m3 linear speed 210 m/s mass flow rate per unit area 87,41 kg/m2s fuel concentration 5,37 % by weight
and the secondary feed has been given the following values:
pressure 1 bar temperature 25 °C density 1.13 kg/m3 fuel content. 0.00 % by weight
The ejector nozzle of the invention can be used for a variety of applications, such as for producing hot drying air, feeding hor combustion air to a combustion unit, etc.
The above description deals with one ejector nozzle of the invention by way of an example, and that is not intended to limit the scope of protection as defined in the following claims. It is also conceivable to design the nozzle structure e.g. in such a way that the tubular central space is replaced by a solid component, the nozzle operating the same way as a normal ejector nozzle, but at a higher intensity by virtue of a transverse feed into the annular space and a rotating motion in the annular space achieved thereby.

Claims

Claims
1. An ejector nozzle (1 ), intended for discharging a mixture of fuel and primary combustion air out of the nozzle for entraining secondary combustion air on ejector principle, characterized in that the nozzle (1 ) is provided with an annular outer space (3) for a combustible mixture of fuel and primary combustion air, and with means (2) for feeding the fuel and/or primary combustion air in a direction transverse to the longitudinal axis of the nozzle into said annular space (3) for setting the mixture present in the annular space in a rotating motion.
2. An ejector nozzle as set forth in claim 1 , characterized in that the nozzle is further provided with a tubular central space (4), which is connectable to a source of secondary combustion air.
PCT/FI1998/000826 1997-10-31 1998-10-23 Ejector nozzle WO1999023418A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU96310/98A AU9631098A (en) 1997-10-31 1998-10-23 Ejector nozzle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI974104A FI102987B1 (en) 1997-10-31 1997-10-31 ejector nozzle
FI974104 1997-10-31

Publications (1)

Publication Number Publication Date
WO1999023418A1 true WO1999023418A1 (en) 1999-05-14

Family

ID=8549840

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1998/000826 WO1999023418A1 (en) 1997-10-31 1998-10-23 Ejector nozzle

Country Status (3)

Country Link
AU (1) AU9631098A (en)
FI (1) FI102987B1 (en)
WO (1) WO1999023418A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1156918A (en) * 1965-11-18 1969-07-02 Colt Ventilation & Heating Ltd Improvements relating to Burner Assemblies
US4708638A (en) * 1985-02-21 1987-11-24 Tauranca Limited Fluid fuel fired burner
EP0510783A2 (en) * 1991-04-20 1992-10-28 Saacke GmbH & Co. KG Device for the combustion of fluid or gaseous fuels
US5761897A (en) * 1996-12-20 1998-06-09 United Technologies Corporation Method of combustion with a two stream tangential entry nozzle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1156918A (en) * 1965-11-18 1969-07-02 Colt Ventilation & Heating Ltd Improvements relating to Burner Assemblies
US4708638A (en) * 1985-02-21 1987-11-24 Tauranca Limited Fluid fuel fired burner
EP0510783A2 (en) * 1991-04-20 1992-10-28 Saacke GmbH & Co. KG Device for the combustion of fluid or gaseous fuels
US5761897A (en) * 1996-12-20 1998-06-09 United Technologies Corporation Method of combustion with a two stream tangential entry nozzle

Also Published As

Publication number Publication date
FI102987B (en) 1999-03-31
FI102987B1 (en) 1999-03-31
FI974104A0 (en) 1997-10-31
FI974104A (en) 1999-03-31
AU9631098A (en) 1999-05-24

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