GB654340A - Improvements in or relating to gas burners - Google Patents

Abstract

<PICT:0654340/III/1> A gas burner particularly for use in the manufacture of carbon black by a process employing a high velocity blast flame, e.g. as described in U.S.A. Specification 2,378,055, comprises a fuel gas manifold adapted to be moved back and forth within a wind-box supplied with air under super-atmospheric pressure, a plurality of substantially parallel burner ports extending through a refractory block of substantial thickness, and a plurality of gas jets each connected with the manifold by a tube of length substantially greater than the depth of the burner ports, the jets and connecting tubes being positioned coaxially with the respective burner ports, and maintained in alignment therewith during said back and forth movement. The wind-box 19, Fig. 2, is divided by partitions 22 into three sections in each of which is mounted a fuel gas manifold 24 supported by carriages 25 running on tracks 26. Each manifold 24 carries four rows of three burner jets 28 connected to the manifold by tubes 27 coaxial with flared metal tubes 17 projecting from ports 15 in a block 7 of refractory material, the length of a tube 27 being greater than the combined lengths of a tube 17 and a port 15. On starting up the burner the jets 28 are moved downstream of the block 7 by moving each carriage 25 by rotating a rod 34, screw-threaded through a boss 36 on the end wall of the wind-box, and connected by a swivel coupling 39 with the manifold 24. The fuel supply pipe 30 connected with each manifold 24 is slidable through a gland 31 in the end wall of the wind-box and is provided with calibration marks which co-operate with an indicator finger 32 to provide means for determining the relative positions of the jets 28 and the ports 15. When combustion has been established the jets 28 are withdrawn to positions near the entrance to the ports 15. The air supply may be controlled by adjustable dampers 23. The hydrocarbon gas to be decomposed to form carbon black is introduced into the flame downstream of the ports 15 through tubes projecting through the furnace walls. In a modified construction the hydrocarbon is supplied through tubes passing through the refractory block 7. U.S.A. Specifications 2,440,423 and 2,440,424 also are referred to.