Patent GB-428499-A (GB)
Title: Improvements relating to liquid-flow gas calorimeters
IPC: G01N25/42
Filed: 1934-04-19
Abstract: 428,499. Gas calorimeters. BOARD OF TRADE, SECRETARY OF, Great George Street, and BOYS, C. V., 66, Victoria Street, both in London. April 19, 1934, No. 11880. [Class 97 (iii)] Relates to improvements in a liquid flow gas calorimeter in which a number of cooling zones for the products of combustion is provided. A primary zone bounded by walls of material capable of withstanding the corrosive action of hot acid gases and a secondary zone bounded by walls made of base metal with a corrosion resisting coating may be provided, the cooling liquid flowing first past the secondary zone and then past the primary zone, whilst the hot gases pass first through the primary zone and then through the secondary zone. The liquid passages, which lead past the cold thermometer may be surrounded by a liquid jacket supplied by the incoming cold liquid whilst those which lead from the hottest zone to the hot thermometer may be surrounded by a liquid jacket supplied by the hot liquid after it has passed the hot thermometer. Two tubes forming a burner and adapted to supply measured quantities of gas and air or oxygen respectively may be normally supported in the primary zone by a parallel motion linkage which enables them to be withdrawn to facilitate lighting or inspection. In the form shown, the burner is carried by a link 58 supported by tubular arms 42, 57, which may be moved to the position indicated in broken lines when desired, the gas being supplied from a gas doling apparatus as described in Specification 428,496, [Group XXIX], through arm 42 to a central burner tube 43 and air being drawn up through the surrounding tube 44 preferably made from the heat resisting glass known under the Registered Trade Mark " Pyrex " or supplied through the arm 57. The hot gases from the flame pass up the chimney 46 and through the primary zone. The wall 24 of the latter and the chimney 46 are made of fused silica or heat resisting glass. From the primary zone 24 the hot gases pass through the secondary zone formed by the hollow casting 18 and twelve tubes 15, which are formed of German silver having a baked varnish coating of a synthetic resin such as the material known under the Registered Trade Mark " Bakelite," to an outlet pipe 48. Ferrules of varying bores may be fitted to the pipe 48 to control the flow of the combustion gases. The cooling water is supplied by a pipe 36 to a water jacket 38 surrounding the cooler parts of the apparatus and from thence passes through holes 39a and up the annular space 40 between two vertical tubes and down a vertical tube 10 in which the thermometer for the entering water is placed. The space 40 provides a cold water jacket for the tube 10 in which the cold temperature is measured and protects it from fluctuations in external temperature. From the tube 10 the water passes through a pipe 11 to an annular chamber 13 closed on top by a diaphragm 14 and embracing the pipes 15 of the secondary zone. The water in the chamber 13 flows radially inwards between the tubes 15, through an aperture in the diaphragm 14 and into a space 16. Here the water flows radially outwards between the tubes 15 and then past the casting 18 to an annular space between the cylindrical wall 22 and combustion vessel 24. The water then flows through a conical nozzle 25, where inequalities in temperature are smoothed out, into a space 27 closed at the upper end by a thermometer pocket 28, into which the water flows through holes 60 passing out through holes 56 and annular spaces 29, 30 into an outer annular space 33, forming a hot water jacket surrounding and separated from the hot region of the water stream by a space which may be filled with insulating material or a number of turns of bright metal foil separated from one another by threads of ebonite. The cold water pipe 10, nozzle 25, thermometer pocket 28 and parts similarly shaded in the drawing are made of ebonite. The water may be supplied to the inlet pipe 36 in measured quantities by the apparatus described in Specification 428,486. In a modification the funnel 46 may be replaced by a water cooled helix and the burner nozzle made of fused silica or platinum.