Patent GB-407923-A (GB)
Title: Improvements relating to combination gas and solid fuel fires
IPC: F24B1/18
Filed: 1932-06-23
Abstract: 407,923. Combined gas and solid-fuel fires. HELPS, G., Manor Court, Nuneaton, Warwickshire. June 23, 1932, Nos. 12456 and 14525. [Class 126.] In a combination gas-burning and solid-fuel fire, an incandescent gas fire is located at the front, or over the front, of the solid-fuel fire and heat transference takes place between the two, such heat transference being effected either by passage of combustion products from the gas fire through the solid fuel, by direct radiation between the fires, or by a combination of these effects. When passage of gases from the gasfire through the solid fuel occurs, the ingress of air to the latter is thereby diminished, allowing slow combustion to be maintained. A number of combination fires operating according to the invention are illustrated, Fig. 1 showing one form in which a gas fire with inclined tubular radiants 9 is arranged in front of a solid-fuel grate 5 having apertures 12 through which combustion products from the gas fire pass into the solid fuel. In modifications, the grate 5 is at a lower level and a front grate extending above and below the top ends of the radiants is provided, the combustion products from the gas fire entering the fuel at a level intermediate the top and bottom of the fuel bed. In a further modification, the radiants are vertical, the tops being backwardly bent to deliver the combustion products through a grate similar to that shown in Fig. 1. In the fire shown in Fig. 5<a> a vertical grid of wires 16<1> on which are threaded cobble radiants is arranged behind tubular radiants 9 and forms the front of the solid-fuel container. Cobble radiants 16<11> may be placed above the radiants 9. In this form transference of heat between the fires occurs mainly by radiation. In a similar fire, the wires 161 and cobble radiants are replaced by vertical rods of refractory material. Fig. 6 illustrates a fire comprising superposed inclined grids 22, 23 of refractory rods on which cobble fuel is threaded or supported and heated by a gas burner 24, the solid-fuel fire comprising a lower grate 18 and an upper grate 19 which is angularly movable for discharge of ash and to allow fuel to be fed to the grate below it. In a modification, the grid 23 extends forwardly to the front grate of the solid-fuel fire, which is hinged to give access to the fuel. In another modification, the solid fuel is supported on a rearwardly-hinged inclined grate beneath, and parallel to, the lower grid of the incandescent fire. In a further modification, the incandescent fire comprises a single inclined grid, and the solid fuel fire comprises a fixed inclined grate below and parallel to it. In the fire shown in Fig. 7, upwardly-converging grids 27, 28 of horizontal refractory bars enclose a combustion space 26 heated by a burner 32, and support at the front cobble radiants 31, some of which are shown threaded on the top bar, and at the rear support the solid fuel. In a modification of this form, the gas-fire portion is of similar form, but is arranged so that the combustion space 26 is inclined rearwardly and upwardly. In this construction, and also in the constructions shown in Figs. 6 and 7, provision may be made for burning solid-fuel in front of the gas fire. Constructions, otherwise similar to those of Figs. 6 and 7, but in which a boiler is provided at the back of the fire, are also illustrated.