GB1397550A - Flare-stack - Google Patents

Abstract

1397550 Flare stack BRITISH PETROLEUM CO Ltd 27 July 1972 [12 Aug 1971] 37867/71 Heading F4T A burner element of a ground flare stack comprises a plurality of combustion-air tubes 6, each with a cross-sectional area greater than 1 cm.<SP>2</SP>, opening into a combustion zone after passing through a fuel chamber 5 which is divided into a fuel inlet space 7 connected to a fuel supply pipe 12 and a fuel outlet space 8 which communicates with the combustion zone and is packed to provide a high resistance to the flow of gas, the bores of the combustion air tubes 6 accounting for at least 25% of the area of the burner element adjacent the combustion zone. The packing is sand which is supported on a plate 9 which extends across the fuel chamber 5 and permits the passage of fuel. One or more pilot tubes (not shown) in the fuel outlet space 8 provide sufficient fuel to provide a pilot flame for reignition. The flare stack (Fig. 1, not shown) comprises a burner of modulµ construction comprising a series of burner elements as shown in Fig. 2 mounted in a frame, the flare stack being provided with walls (4) projecting vertically upwards from the edge of the burner and enclosed, around the base of the flarestack walls, by a draught fence (3) through which the combustion air flows. The height of the burner element from the ground is a quarter to a third of the length of the side of the burner element, which is between 5<SP>1</SP> and 30<SP>1</SP>. The flare stack walls (4) are made of steel-reinforced refractory concrete and the draught fence (3) is a slat arrangement of glass fibre-reinforced concrete. Reference has been directed by the Comptroller to Specification 1,227,524.