GB191418471A - Improvements in or relating to Furnaces. - Google Patents

Abstract

18,471. Chantraine, A. B. Aug. 8. Gaseous-fuel furnaces. -Gas is supplied to the heating chamber of a furnace so as to fill the heating-chamber and pass slowly through it and the combustion of gas is effected by injecting jets of preheated air into the gas through a large number of perforations in the furnace wall or lining so as to direct an evenly distributed sheaf of flame on to the contents of the furnace. Fig. 1 shows a furnace for heating long articles such as gunbarrels, in which gas entering through ports 12, 12<a> is supplied with air from openings 4 in the lining 1. Air from the regenerator 14 passes into a duct 7 and thence through damper-controlled passages to the various sections of the annular chamber 5. By controlling the admission of air to different sections of the furnace the temperature of different parts of the furnace may be regulated. Fig. 3 shows a modification in which gas from a reservoir 12 passes through a passage 12 into the furnace, and pre-heated air is injected into the gas through the perforated crown of the furnace. A similar arrangement of the air ports may be applied to a furnace for heating a muffle. Fig. 4 shows a modification in which the air admitted vertically dowards through the crown of the furnace is insufficient to consume all the gas admitted at 12. The excess of gas is burnt by jets of air admitted through a vertical wall to produce additional heat for a water-tube boiler. In the modification shown in Fig. 6, gas passess along both sides of the refractory vessel 19, while the burnt gases pass out through the openings 20.