GB2107449A - Burner - Google Patents

Abstract

Apparatus for supplying heat radially, comprises a burner 4 directing a jet of hot gas against a barrier 1 serving to obstruct the jet flow so that the jet is dispersed radially and means for supporting the barrier in the path of the gas. The barrier comprises a disc 1 of a heat insulated material and is mounted in a cup 5 and support means, in the form of three air cooled tubes 10, are welded to the cup 5 to support the disc 1 in front of the burner 4. The tubes 10 are mounted on brackets 13 and 14 extending from the burner 4 and are spaced equiangularly about the burner 4. Natural gas supplied to the by way of an inlet 21 is combusted inside the burner 4 by air supplied to the burner 4 by way of an inlet 18 and the exhaust gas leaves the burner outlet 3 at high velocity. <IMAGE>

Description

SPECIFICATION Apparatus for supplying heat The present invention relates to apparatus for supplying heat radially particularly where radial heat transfer, using connective forces, is required to heat materials positioned axially around a gas burner.

According to the present invention apparatus for supplying heat radially comprises means for directing a jet of hot gas against a barrier serving to obstruct the jet flow so that the jet is dispersed radially and means for supporting the barrier in the path of the gas.

Preferably the barrier is of a heat insulated material.

Suitably the barrier is a disc having a face to obstruct the flow of the gas.

Conveniently the support means extends from the gas jet directing means.

Preferably the support means comprises a plurality of tubes.

Suitably the tubes are air cooled.

Conveniently the gas jet directing means comprises a forced draught burner.

An embodiment of the present invention will now be particularly described with reference to the accompanying drawings in which: Figure 1 is a side view partly in section of the apparatus and Figure 2 is front view of the apparatus showing the disc and cooling tubes.

Referring to the drawings, the apparatus comprises a barrier of a thermally insulated material in the form of a disc 1 supported so that one face 2 is in front of the outlet 3 of a conventional forced draught burner 4 serving to provide a jet of hot gas to be directed against the face 2 of the disc 1.

The disc 1 which takes the form of a short cylinder, is held in a cylindrical steel cup 5 with a face 2 facing the burner outlet 3 and with a circumferential portion 6 outside the cup 5. The disc 1 itself is of a ceramic material such as alumina or sillimanite. While not shown the cup wall 7 is provided with three set screws spaced at 120 intervals to hold the disc in place, the disc having three corresponding apertures to receive the screws.

The cup 5 is supported by three cylindrical steel sockets to which the cup 5 is welded, the sockets being screwed onto the threaded ends of three steel tubes 9, only one tube being shown in Figure 1.

The tubes 9 serve as support means for the disc 1 and have portions 10 extending parallel to the axis of the burner 4 and portions 11 disposed at right angles to the portions 10. The portions 10 and 11 are connected together by an internally threaded steel elbow 12 in which threaded ends of portions 10 and 1 are inserted. The portions 11 are threaded at their other ends to receive the sockets 8 as previously described.

The tubes 9 are spaced at angle of 120 from each other around the circumference of the disc and burner and are mounted on a pair of steel brackets 13 and 14 (only one pair shown in Figure 1) which extend radially from the burner body 15 and each bracket 13 and 14 is apertured to enable the tube 9 to pass therethrough. The tubes 9 are further sup ported by a radial steel flange 16 welded onto the burner body 15 and extend through suitable apertures in the flange 16. The tubes 9 are cooled by the passage of air through them from a suitable air fan.

The burner 4 comprises a conventional forced draught burner specifically designed for producing thigh velocity exhaust gas. The burner 4 comprises a body 15 having a tapered end 17, a steel air inlet pipe 18 extending radially from the body 15 close to the other end, a steel slip flange 19 welded to the body at this end and a blank steel flange 20 screw clamped (not shown) to the slip flange 19. A steel gas inlet pipe 21 extends through the flanges, the inlet pipe 21 being provided at its end with a conventional multi port high velocity gas burner nozzle (not shown) which is located in use just to the right of the tapered end 17 shown in Figure 1. The gas pipe 21 is supplied with natural gas from a suitable source while air is supplied from a suitable air fan to the air pipe 18.An electrode (not shown), for providing ignition of the gas issuing through the burner nozzle, extends through the body 15 and terminates adjacent the nozzle outlet. The electrode is mounted in an electrode holder 22 which is secured to the flange 20.

While not shown the burner4 is supported on a suitable stand to which it is clamped.

After ignition of the burner 4, the combustion products flow from the burner outlet end 3 in an axial direction but on striking the disc face 2 the products flow in a radial direction due to their momentum on impact with the disc. The arrows in Figure 1 illustrate this in detail.

To achieve adequate change in direction of the combustion products, the velocity of gases striking the disc needs to be relatively high so that it is desirable to use a high velocity burner.

The velocity components of the radial discharge may be altered by adjusting the distance between the burner and the disc and also by altering the size and shape of the disc. The proportion of gases discharged at right angles to the burner axis will increase with disc size and proximity to the burner.

Adjustment can therefore be made using these two parameters to direct flow to suit the particular requirments of a given process.

The apparatus is particularly suitable for heating circular arrays of metal billets supplied as batches for heat treatment.

1. Apparatus for supplying heat radially comprising means for directing a jet of hot gas against a barrier serving to obstruct the jet flow so that the jet is dispersed radially and means for supporting the barrier in the path of the gas.

2. Apparatus as claimed in Claim 1 in which the barrier is of a heat insulated material.

3. Apparatus as claimed in Claim 1 or Claim 2 in which the barrier is a disc having a face to obstruct the flow of the gas.

4. Apparatus as claimed in any of Claims 1 to 3 in

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Apparatus for supplying heat The present invention relates to apparatus for supplying heat radially particularly where radial heat transfer, using connective forces, is required to heat materials positioned axially around a gas burner. According to the present invention apparatus for supplying heat radially comprises means for directing a jet of hot gas against a barrier serving to obstruct the jet flow so that the jet is dispersed radially and means for supporting the barrier in the path of the gas. Preferably the barrier is of a heat insulated material. Suitably the barrier is a disc having a face to obstruct the flow of the gas. Conveniently the support means extends from the gas jet directing means. Preferably the support means comprises a plurality of tubes. Suitably the tubes are air cooled. Conveniently the gas jet directing means comprises a forced draught burner. An embodiment of the present invention will now be particularly described with reference to the accompanying drawings in which: Figure 1 is a side view partly in section of the apparatus and Figure 2 is front view of the apparatus showing the disc and cooling tubes. Referring to the drawings, the apparatus comprises a barrier of a thermally insulated material in the form of a disc 1 supported so that one face 2 is in front of the outlet 3 of a conventional forced draught burner 4 serving to provide a jet of hot gas to be directed against the face 2 of the disc 1. The disc 1 which takes the form of a short cylinder, is held in a cylindrical steel cup 5 with a face 2 facing the burner outlet 3 and with a circumferential portion 6 outside the cup 5. The disc 1 itself is of a ceramic material such as alumina or sillimanite. While not shown the cup wall 7 is provided with three set screws spaced at 120 intervals to hold the disc in place, the disc having three corresponding apertures to receive the screws. The cup 5 is supported by three cylindrical steel sockets to which the cup 5 is welded, the sockets being screwed onto the threaded ends of three steel tubes 9, only one tube being shown in Figure 1. The tubes 9 serve as support means for the disc 1 and have portions 10 extending parallel to the axis of the burner 4 and portions 11 disposed at right angles to the portions 10. The portions 10 and 11 are connected together by an internally threaded steel elbow 12 in which threaded ends of portions 10 and 1 are inserted. The portions 11 are threaded at their other ends to receive the sockets 8 as previously described. The tubes 9 are spaced at angle of 120 from each other around the circumference of the disc and burner and are mounted on a pair of steel brackets 13 and 14 (only one pair shown in Figure 1) which extend radially from the burner body 15 and each bracket 13 and 14 is apertured to enable the tube 9 to pass therethrough. The tubes 9 are further sup ported by a radial steel flange 16 welded onto the burner body 15 and extend through suitable apertures in the flange 16. The tubes 9 are cooled by the passage of air through them from a suitable air fan. The burner 4 comprises a conventional forced draught burner specifically designed for producing thigh velocity exhaust gas. The burner 4 comprises a body 15 having a tapered end 17, a steel air inlet pipe 18 extending radially from the body 15 close to the other end, a steel slip flange 19 welded to the body at this end and a blank steel flange 20 screw clamped (not shown) to the slip flange 19. A steel gas inlet pipe 21 extends through the flanges, the inlet pipe 21 being provided at its end with a conventional multi port high velocity gas burner nozzle (not shown) which is located in use just to the right of the tapered end 17 shown in Figure 1. The gas pipe 21 is supplied with natural gas from a suitable source while air is supplied from a suitable air fan to the air pipe 18.An electrode (not shown), for providing ignition of the gas issuing through the burner nozzle, extends through the body 15 and terminates adjacent the nozzle outlet. The electrode is mounted in an electrode holder 22 which is secured to the flange 20. While not shown the burner4 is supported on a suitable stand to which it is clamped. After ignition of the burner 4, the combustion products flow from the burner outlet end 3 in an axial direction but on striking the disc face 2 the products flow in a radial direction due to their momentum on impact with the disc. The arrows in Figure 1 illustrate this in detail. To achieve adequate change in direction of the combustion products, the velocity of gases striking the disc needs to be relatively high so that it is desirable to use a high velocity burner. The velocity components of the radial discharge may be altered by adjusting the distance between the burner and the disc and also by altering the size and shape of the disc. The proportion of gases discharged at right angles to the burner axis will increase with disc size and proximity to the burner. Adjustment can therefore be made using these two parameters to direct flow to suit the particular requirments of a given process. The apparatus is particularly suitable for heating circular arrays of metal billets supplied as batches for heat treatment. CLAIMS

1. Apparatus for supplying heat radially comprising means for directing a jet of hot gas against a barrier serving to obstruct the jet flow so that the jet is dispersed radially and means for supporting the barrier in the path of the gas.

2. Apparatus as claimed in Claim 1 in which the barrier is of a heat insulated material.

3. Apparatus as claimed in Claim 1 or Claim 2 in which the barrier is a disc having a face to obstruct the flow of the gas.

4. Apparatus as claimed in any of Claims 1 to 3 in which the support means extends from the gas jet directing means.

5. Apparatus as claimed in any of the preceding claims in which the support means comprises a plurality of tubes.

6. Apparatus as claimed in Claim 5 in which the tubes are air cooled.

7. Apparatus as claimed in any of the preceding claims in which the gas jet directing means comprises a forced draught burner.

8. Apparatus substantially as hereinbefore described with reference to the accompanying drawings.