Internal combustion burner

Patent metadata

Field	Value
Publication number	US-9587822-B2
Application number	US-59494808-A
Country	US
Kind code	B2
Filing date	Apr 7, 2008
Priority date	Apr 12, 2007
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

An internal combustion burner including a combustion chamber supplied with fuel and with oxidant and at least two combustion devices supplied with oxidant and with fuel. Combining two combustion devices of distinct configurations, which respectively generate two distinct types of flames with a system for cooling the walls of the burner by introducing air along the walls, makes it possible to obtain a burner that supplies a combustion gas temperature of up to 1700° C., while at the same time being easily cooled and occupying very little space so that it can, for example, be housed in an existing installation used in the manufacture of rock wool or glass wool.

First claim

The invention claimed is:

1. An internal combustion burner comprising:
a combustion chamber supplied with fuel and with oxidant, the chamber comprising a casing including a first end which is closed and with an opposite exhaust second end which is open and via which the combustion gases escape, the casing including at least two opposite walls connecting the two ends,
and further comprising in the chamber and at the closed first end, at least two combustion devices supplied with oxidant and with fuel, the at least two combustion devices include a first type of combustion device and a second type of combustion device that are configured differently so as respectively to generate two distinct types of flame, and including a system for cooling the two opposite walls by introducing a cooling gas along the two opposite walls,
wherein each combustion device includes a body having a first face facing an exterior of the combustion chamber at the first end and a second face opposite to the first face and facing an interior of the combustion chamber, the body including plural oxidant supply ducts and one fuel supply duct passing through a thickness of the body from one face to the other, with an axis of the fuel supply duct being perpendicular to the faces of the body,
wherein the first type of combustion device and the second type of combustion device are arranged alternating in a ring on the first face of the body facing the exterior of the combustion chamber,
wherein in a case of one of the combustion devices, the oxidant supply ducts are inclined with respect to the axis of the central fuel supply duct and each oxidant supply duct includes an inlet on the first face of the body of the device and an outlet opening onto the surface of the second face of the body of the device, the inlets and the outlets of the ducts being arranged in circles around the central fuel supply duct,
wherein in the case of one of the combustion devices, a diameter of the circle of the plural inlets arranged around the central fuel supply duct have a same size as a diameter of the circle of the plural outlets arranged around the central fuel supply duct, and
wherein, for each of the plural inlets and outlets, a diameter of the inlet is the same as a diameter of the corresponding outlet.

2. A burner according to claim 1 , wherein the cooling system is configured to generate a shielding curtain of cooling gas that insulates the second face of the walls from the flames.

3. A burner according to claim 1 , wherein the cooling system comprises a plurality of through holes passing through the walls and through which air is to rush, and deflecting strips internal to the combustion chamber and each forming a cavity that faces plural holes and is to receive the air from the holes and a guide slot to lead the air from the cavity towards the inside of the chamber.

4. A burner according to claim 3 , wherein the walls of the chamber includes, on their external face, on the outside of the combustion chamber, a plurality of steps that extend along a shortest side of the wall and in which the through-holes are made.

5. A burner according to claim 4 , further comprising, formed between the steps, landings configured in the manner of an ear of corn and that are angled towards the exhaust end of the burner.

6. A burner according to claim 3 , wherein the deflecting strips are orientated so that the air from the guide slots displays a directional flow substantially parallel to the internal faces of the walls of the chamber on the combustion side.

7. A burner according to claim 1 , wherein the fuel supply duct is positioned centrally with respect to the oxidant supply ducts and includes an extension projecting beyond the second face of the body and beyond the oxidant supply ducts, the projecting part being provided with a plurality of holes.

8. A burner according to claim 1 , wherein the body comprises a peripheral surround that projects beyond the second face of the body so as partially or completely to encircle outlets of the oxidant supply ducts.

9. A burner according to claim 1 , wherein the combustion devices are arranged in a circle in a case of a burner casing of annular shape.

10. A burner according to claim 1 , wherein the walls are spaced at most 5 cm apart.

11. A burner according to claim 1 , wherein the casing is made of metal.

12. An internal combustion burner comprising:
a combustion chamber supplied with fuel and with oxidant, the chamber comprising a casing including a first end which is closed and with an opposite exhaust second end which is open and via which the combustion gases escape, the casing including at least two opposite walls connecting the two ends,
and further comprising in the chamber and at the closed first end, at least two combustion devices supplied with oxidant and with fuel, the at least two combustion devices are positioned adjacent each other, the at least two combustion devices include a first type of combustion device and a second type of combustion device and are configured differently so as respectively to generate two distinct types of flame, and including a system for cooling the two opposite walls by introducing a cooling gas along the two opposite walls,
wherein each combustion device includes a body having a first face facing an exterior of the combustion chamber at the first end and a second face opposite to the first face and facing an interior of the combustion chamber, the body including plural oxidant supply ducts and one fuel supply duct passing through a thickness of the body from one face to the other, with an axis of the fuel supply duct being perpendicular to the faces of the body,
wherein the first type of combustion device and the second type of combustion device are arranged alternating in a ring on the first face of the body facing the exterior of the combustion chamber,
wherein in a case of one of the at least two combustion devices, the oxidant supply ducts are inclined with respect to the axis of the central fuel supply duct and each oxidant supply duct includes an inlet on the first face of the body of the device and an outlet opening onto the surface of the second face of the body of the device, the inlets and the outlets of the ducts being arranged in circles around the central fuel supply duct, the circles of the inlets and the outlets of the ducts arranged about the central fuel supply duct have different diameters, and a diameter of the circle formed by the outlets has a smaller diameter than a diameter of the circle formed by the inlets, and
wherein in a case of one of the at least two combustion devices, the oxidant supply ducts are inclined with respect to the axis of the central fuel supply duct and each oxidant supply duct includes an inlet on the first face of the body of the device and an outlet opening onto the surface of the second face of the body of the device, wherein the inlets and the outlets of the ducts are arranged in circles around the central fuel supply duct, a diameter of the circle of the plural inlets arranged around the central fuel supply duct has a same size as a diameter of the circle of the plural outlets arranged around the central fuel supply duct, and
wherein for each of the plural inlets and outlets, a diameter of the inlet is the same as a diameter of the corresponding outlet.

13. A burner according to claim 12 , wherein the cooling system is configured to generate a shielding curtain of cooling gas that insulates the second face of the walls from the flames.

14. A burner according to claim 12 , wherein the cooling system comprises a plurality of through holes passing through the walls and t

Assignees

• Boulanov Oleg
• Ellison Christopher
• Saint Gobain Isover

Inventors

• Boulanov Oleg
• Ellison Christopher

Classifications

• F23M9/02

  in air inlets · CPC title

• F23D2900/11403

  Flame surrounding tubes in front of burner nozzle · CPC title

• C03B37/06

  by blasting or blowing molten glass, e.g. for making staple fibres · CPC title

• F23D14/58

  characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration · CPC title

• F23C2900/03005

  Burners with an internal combustion chamber, e.g. for obtaining an increased heat release, a high speed jet flame or being used for starting the combustion · CPC title