| 摘要 |
<p>1473386 Fluid heaters; water heaters; burners; revaporizing gases JOHN THURLEY Ltd 29 April 1974 18629/74 Headings F4A F4K F4P F4S and F4T A fluid (in particular a liquefied gas to be revaporized) is heated in a heat exchanger 5 which is immersed in a heat transfer liquid (e.g. water) through which combustion gases from a burner 4 pass upwardly in contact with the liquid, the burner 4 having the following features (a) a fuel inlet 21 and/or 23, (b) an upper tangential air inlet 11, (c) a lower combustion chamber 15 with a combustion products outlet 17, (d) a frusto-conical duct 19 extending downwardly to the chamber 15, (e) at least the chamber 15 being immersed in a coolant liquid (shown as having a level 55). As shown, the heat exchanger 5 (comprising either plates or sinuous tubes) is positioned in an open-topped compartment defined by walls 29, 33 and combustion gases pass from the outlet 17 of the burner via duct 7, tubes 43, and ports 47 therein, and rise upwardly through the heat transfer liquid to pass ultimately (after separating out of the liquid) to flues 49, 51. The same liquid serves as both coolant for the burner combustion chamber and as the heat transfer liquid and is continuously recirculated by the rising combustion gases between the heat exchanger compartment and the remainder of the vessel 1, there being a gap 33a between the bottom of the weir 33 and the floor of the vessel 1; or alternatively ports may be provided in the walls of the weir close to the floor of the vessel 1. In the operation of the burner 4 the combustion air entering at 11 forms a downwardly flowing layer 53 on the wall of the duct 19. Fuel is injected via one or both of the inlets 21 and 23 and combustion occurs mainly within the duct 19 but also in the chamber 15.</p> |
