Patent GB-1135000-A (GB)
Title: Improvements in gas burners
IPC: F23D14/00
Filed: 1967-11-28
Abstract: 1,135,000. Gasburners. KONINKLIJKE NEDERLANDSCHE GROFSMEDERIJ N.V. 28 Nov.; 1967 [29 Nov., 1966], No. 54072/67. Heading F4T. A gas burner designed particularly for use with natural gas comprises a gas supply con-  duit 1 opening into acylindrical mixing chamber 7 with a diffusing element 2 having perforations 3 mounted between the conduit and the chamber 7, a hollow annular casing forming an air supply chamber 9 having apertures 10. 11 in its inner wall communicating with an annular space between the casing and mixing chamber 7, a burner tube 12 coaxial with chamber 7 and vanes 16 in the space between chambers 7, 9. Gas supplied under pressure to conduit 1 enters the mixing chamber 7 through perforations 3 and is mixed with air sucked into the chamber through apertures 7a, the air/gas mixture passing from chamber 7 into tube 12 impinges on a diametrically arranged rod 15 to be divided into two streams and the vanes 16 create swirling so that intimate mixing is achieved. 1,135,018. Tubular heat exchangers; gas liquefaction plant. SULZER BROS. Ltd. 4 March, 1966 [17 April, 1965], No. 9717/66. Headings F4P and F4S. Plant for cooling and preferably liquefying a low-temperature gas such as hydrogen or helium includes a heat exchanger 1 (shown in detail in Figs. 2-4) in which a high pressure stream of the gas is cooled by a low pressure stream of the gas.  The heat exchanger comprises a nest of circular tubes 12 of identical cross-section, in contact with one another and enclosed in a tubular jacket 11 of polygonal cross section. Both the tubes and jacket may be straight (asshown) or helical. Triangular interstices 17, 18- are formed between neighbouring tubes, and between the outermost tubes and the jacket. In use, low pressure gas flows through the tubes and these have a total flow cross-sectional area larger than that provided by the interstices 17, 18 through which flows the high pressure gas stream. The cross-section of the tubes may be reduced at intervals (Fig. 4) to provide interconnection between the spaces 17, 18 around the tubes. As shown, the tube ends are connected to inlet and outlet headers 20 for the low pressure gas stream. The high pressure gas stream is conducted to and from the spaces 17, 18 between the tubes, by way of end chambers 19 which. have a gas inlet 15 and outlet 16 respectively The tubes shown are spread apart at their ends. Alternatively the tubes may be parallel to one another throughout their whole length, the end chambers 19 being formed beyond the tube ends by extensions of the jacket 11. The area of the interstices 18 between the tubes and the jacket may be reduced by the use of inserts e.g. wires. In the plant shown in Fig.1 the low temperature gas enters through pipe 3 from which it flows through a compressor 4 into a high pressure path H. In the path H the gas is cooled to a temperature Tv below its inversion temperature by heat exchanger, 5, 6, 7, and 1, and by workperforming expansion in two turbines 8, 9, before flowing through a throttle valve 2. Some of the gas is liquefied on throttling and the liquid collects in a storage tank 10 with a liquid outlet 10a controlled by a valve 10b. The