FUEL COMBUSTION SYSTEM

• US 20160290635A1
• Filed: 04/10/2015
• Published: 10/06/2016
• Est. Priority Date: 04/03/2015
• Status: Active Grant

• Current Assignee: Frenette, Eugene R., Frenette, Henry E.
• Original Assignee: Frenette, Eugene R., Frenette, Henry E.
• Inventors: FRENETTE, Eugene R., FRENETTE, Henry E.
• Granted Patent: US 9,874,349 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F23D 11/106 medium and fuel meeting at the burner outlet
• CPC Class Codes: F23D 11/404 Flame tubes not forming part of the burner F23M9/06
• CPC Class Codes: F23D 11/408 Flow influencing devices in the air tube
• CPC Class Codes: F23D 14/24 at least one of the fluids being submitted to a swirling motion
• CPC Class Codes: F23D 14/56 for spreading the flame over an area, e.g. for desurfacing of solid material, for surface hardening, or for heating workpieces
• CPC Class Codes: F23D 14/58 characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
• CPC Class Codes: F23D 2203/1012 tubular
• CPC Class Codes: F23D 2207/00 Ignition devices associated with burner
• CPC Class Codes: F23D 23/00 Assemblies of two or more burners gas burners with provision for a retention flame F23D14/26
• CPC Class Codes: F23D 2900/11101 Pulverising gas flow impinging on fuel from pre-filming surface, e.g. lip atomizers

Abstract

A combustion system comprises a discharge nozzle with concentric air and fuel orifices. A fuel conduit is coupled to each fuel orifice while an air conduit is coupled to each air orifice. The fuel and air only mixing with one another upon discharge. A supplemental air source supplies supplement air for combustion. An air deflector disk supports the discharge nozzle and a cylindrical blast tube surrounds the air deflector sleeve and the air deflector disk while an outlet end of the cylindrical blast tube supports a flame retention head. The deflector disk permits some combustion air to flow into the combustion chamber while redirecting a remaining portion of the supplement air. The flame retention head permits some of the supplement air to discharge into a burner box while redirecting the remaining supplement air radially inward through openings in the air deflector sleeve to assist with combustion of the fuel mixture.

Claims

1. A fuel combustion system for burning a fuel mixture, the fuel combustion system comprising:

at least one discharge nozzle being supported by a fuel discharge body; and

each at least one discharge nozzle having a liquid fuel orifice and a concentric air orifice surrounding the liquid fuel orifice;

a liquid fuel supply conduit being coupled to each liquid fuel orifice for supplying liquid fuel thereto from a fuel supply;

an air supply conduit being coupled to each air orifice for supplying pressurized air thereto from a pressurized air source;

the liquid fuel and the pressurized air only mixing with one another, to form the fuel mixture, upon being discharged from the concentric liquid fuel and air orifices;

an inlet section of an air deflector sleeve being located for receiving the fuel mixture discharged by the at least one discharge nozzle;

a blast tube surrounding the air deflector sleeve and an outlet end of the cylindrical blast tube supporting a flame retention head;

a supplemental air fan for supplying supplement air into an inlet end of the blast tube for supplying supplement air to assist with combustion of the fuel mixture;

an air deflector disk supporting the at least one discharge nozzle within the blast tube and directing some of the supplement air into the inlet section of the air deflector sleeve and redirecting a remaining portion of the supplement air toward the flame retention head, and the air deflector disk being located between the fuel discharge body and the inlet section of the air deflector sleeve; and

the flame retention head discharging some of the supplemental air axially through plurality of plurality of apertures formed therein and redirecting a remaining portion of the supplement air radially inward through a plurality of openings formed in an outlet section of the air deflector sleeve to assist with combustion of the fuel mixture.

2. The fuel combustion system according to claim 1, wherein the at least one discharge nozzle comprises a pair of discharge nozzles and the fuel combustion system further comprises a pair of electrodes, located adjacent and downstream of the pair of discharge nozzles, for igniting the fuel mixture following discharged thereof from the pair of discharge nozzles, and a flame detector is located adjacent the pair of discharge nozzles for detecting a presence of a flame generated by combustion of the fuel mixture.

3. The fuel combustion system according to claim 1, wherein a cylindrical sleeve couples the air deflection disk to the inlet section of the air deflector sleeve, and the air deflection disk, the cylindrical sleeve, and the inlet and the outlet sections of the air deflector sleeve form a combustion chamber for communicating with a burner box, following installation of the fuel combustion system.

4. The fuel combustion system according to claim 1, wherein the air deflector disk has an annular ring which has a diameter which is less than an internal diameter of the blast tube so as to facilitate sliding movement and centering of the air deflector disk with respect to the blast tube,

the air deflector disk has an electrode passage which is sized and shaped to permit a pair of electrodes, supported by the fuel discharge body, to pass therethrough, and

the air deflector disk has a plurality of small supplemental air holes which permit a minor portion of the supplemental air to pass through air deflector disk and flow into the combustion chamber while a remaining portion of the supplemental air is diverted by the air deflector disk.

5. The fuel combustion system according to claim 1, wherein the air deflector disk has a pair of spaced apart nozzle apertures which are each larger than the liquid fuel and the air discharge orifices of the discharge nozzles so as to permit the fuel mixture, which is discharged from each one of the respective discharge nozzles, to flow through the nozzle apertures of the air deflector disc and into the combustion chamber while preventing the discharge nozzles from extending into the combustion chamber.

6. The fuel combustion system according to claim 1, wherein a plurality of small supplemental air apertures are formed in both the cylindrical sleeve and the inlet section of the air deflector sleeve for supplying supplemental air radially inward to assist with combustion of the fuel mixture.

7. The fuel combustion system according to claim 1, wherein the inlet section of the air deflector sleeve is axially spaced from the air deflection disk by at least one spacer leg so that the air deflection disk is spaced from the inlet section of the air deflection sleeve, and the at least one spacer leg allows a minor portion of the supplemental air, which flows around or through the air deflection disk, to flow into the inlet section of the air deflector sleeve and assist with complete combustion of the fuel mixture.

8. The fuel combustion system according to claim 1, wherein the outlet section has between 15 and 100 apertures formed therein, and each one of the apertures is approximately a ¼

±

⅛

of an inch in diameter and a mid-section of the air deflector sleeve has a diameter of between 2 and 6 inches, and a diameter of the mid-section of the air deflector sleeve is between 15-50% greater than a diameter of both of an inlet end and an outlet end of the air deflector sleeve.

9. The fuel combustion system according to claim 1, wherein opposed ends of the inlet and the outlet sections of the air deflector sleeve are both open and a diameter of open ends of the inlet and the outlet sections is less than a diameter of a mid-section of the air deflector sleeve.

10. The fuel combustion system according to claim 1, wherein each liquid fuel orifice is centrally located within the pressurized air orifice and projects through a cover of the discharge nozzle by a distance of at least 0.002 of an inch more than the air orifice so that the liquid fuel only mixes with the pressurized air upon being discharged.

11. The fuel combustion system according to claim 1, wherein the liquid fuel supply conduit is connected to a liquid fuel storage tank which stores a supply of the liquid fuel, and the liquid fuel is supplied from the liquid fuel storage tank to the at least one discharge nozzle at a pressure of between about 0.5 psi and about 2 psi.

12. The fuel combustion system according to claim 11, wherein at least one valve is provided along the liquid fuel supply conduit for interrupting a flow of the liquid fuel from the liquid fuel storage tank to the at least one discharge nozzle, when the fuel combustion system is inactive, and a liquid fuel pump is provided for pumping the liquid fuel from the liquid fuel storage tank to the at least one discharge nozzle.

13. The fuel combustion system according to claim 12, wherein the liquid fuel pump pumps the liquid fuel from the liquid fuel storage tank along the liquid fuel supply conduit at a flow rate of between about 1 gallon per hour to about 16 gallons per hour and at a pressure of between about 70 psi to about 300 psi, and the liquid fuel supply conduit has a fuel regulator for reducing a pressure of the supplied liquid fuel to a pressure of between 0.5 psi and 2 psi.

14. The fuel combustion system according to claim 1, wherein the pressurized air source comprises an air compressor which supplies compressed air along a pressurized air supply conduit to each air orifice at a pressurize of between 2 and 30 psi.

15. The fuel combustion system according to claim 14, wherein the pressurized air supply conduit contains an air restrictor therein for reducing the pressure of the pressurized air being supplied by the air compressor, and the air restrictor reduces the pressure of the pressurized air to an air pressure of between 3.5 psi and 7.0 psi.

16. The fuel combustion system according to claim 1, wherein a pressurized air solenoid valve is located along the pressurized air supply conduit for interrupting a flow of the pressurized air to the at least one discharge nozzle when the combustion system is inactive, and a liquid fuel solenoid valve is located along the liquid fuel supply conduit for interrupting a flow of the liquid fuel to the at least one discharge nozzle when the fuel combustion system is inactive.

17. A fuel combustion system for burning a fuel mixture, the fuel combustion system comprising:

a pair of discharge nozzles being supported by a fuel discharge body, and each discharge nozzle having a centrally located liquid fuel orifice and a concentric air orifice surrounding the liquid fuel orifice;

a liquid fuel supply conduit being coupled to each liquid fuel orifice for supplying liquid fuel thereto from a fuel supply;

an air supply conduit being coupled to each air orifice for supplying pressurized air thereto from a pressurized air source;

the liquid fuel and the pressurized air only mixing with one another, to form the fuel mixture, upon being discharged from the concentric liquid fuel and air orifices;

an air deflector disk supporting the pair of discharge nozzles within the blast tube;

an air deflector sleeve having both an inlet section and an outlet section;

a cylindrical sleeve coupling the inlet section of the air deflector sleeve to the air deflection disk, and the air deflection disk, the cylindrical sleeve, and the inlet and the outlet sections of the air deflector sleeve forming a combustion chamber for communicate with a burner box;

the pair of discharge nozzles both discharging the fuel mixture into the combustion chamber;

a cylindrical blast tube surrounding the air deflector sleeve and an outlet end of the cylindrical blast tube supporting a flame retention head;

a supplemental air fan for supplying supplement air into an inlet end of the blast tube for supplying supplement air to assist with combustion of the fuel mixture;

the air deflector disk directing some of the supplement air into the combustion chamber and redirecting a remaining portion of the supplement air toward the flame retention head, and the air deflector disk being located between the fuel discharge body and the inlet section of the air deflector sleeve; and

the flame retention head discharging some of the supplemental air axially through plurality of plurality of apertures formed therein and redirecting a remaining portion of the supplement air radially inward through a plurality of openings formed in an outlet section of the air deflector sleeve to assist with combustion of the fuel mixture;

a pair of electrodes, being located adjacent the pair of discharge nozzles, for igniting the fuel mixture following discharged thereof from the pair of discharge nozzles; and

a flame detector being located adjacent the pair of discharge nozzles for detecting a presence of a flame generated by combustion of the fuel mixture.

18. The fuel combustion system according to claim 17, wherein the air deflector disk has an annular ring which has a diameter which is less than an internal diameter of the blast tube so as to facilitate sliding movement and centering of the air deflector disk with respect to the blast tube,

the air deflector disk has an electrode passage which is sized and shaped to permit the pair of electrodes to pass therethrough and extend into the combustion chamber;

and

the air deflector disk has a plurality of small supplemental air holes which permit a minor portion of the supplemental air to pass through air deflector disk and flow into the combustion chamber while a remaining portion of the supplemental air is diverted by the air deflector disk toward the outlet end of the cylindrical blast tube.

19. The fuel combustion system according to claim 18, wherein the air deflector disk has a pair of spaced apart nozzle apertures which are each larger than the liquid fuel and the air discharge orifices of the pair of discharge nozzles so as to permit the discharged fuel mixture to flow through the nozzle apertures of the air deflector disc and into the combustion chamber while preventing the discharge nozzles from extending into the combustion chamber;

and

a plurality of small supplemental air apertures are formed in both the cylindrical sleeve and the inlet section of the air deflector sleeve for supplying supplemental air radially inward to assist with combustion of the fuel mixture.

20. A method of supplying a fuel mixture to a fuel combustion system for burning the fuel mixture, the fuel combustion system comprises at least one discharge nozzle supported by a fuel discharge body, and each discharge nozzle has a centrally located liquid fuel orifice and a concentric air orifice surrounding the liquid fuel orifice;

a liquid fuel supply conduit coupled to each liquid fuel orifice for supplying liquid fuel thereto from a fuel supply;

an air supply conduit being coupled to each air orifice for supplying pressurized air thereto from a pressurized air source;

the liquid fuel and the pressurized air only mixing with one another, to form the fuel mixture, upon discharge from the respective liquid fuel and air orifices;

an inlet section of an air deflector sleeve is axially spaced from the at least one discharge nozzle for receiving the fuel mixture discharged by the at least one discharge nozzle;

a cylindrical blast tube surrounds the air deflector sleeve and an outlet end of the cylindrical blast tube supports a flame retention head;

a supplemental air fan supplies supplement air into an inlet end of the blast tube for supplying supplement air to assist with combustion;

an air deflector disk supports the at least one discharge nozzle within the blast tube, and the air deflector disk being located between the fuel discharge body and the inlet section of the air deflector sleeve;

the method comprising the step of;

permitting a minor portion of the supplement air to flow through openings in the air deflector disk and into the combustion chamber while redirecting a remaining portion of the supplement air toward the flame retention head; and

directing some of the supplemental air, via the flame retention head, axially through apertures in the flame retention head into a burner box, and redirecting a remaining portion of the supplemental air through a plurality of apertures formed in the outlet section of the air deflector sleeve to assist with combustion of the fuel mixture.