Patent GB-231186-A (GB)
Title: Improved heat interchanging apparatus and process
IPC: F28D7/02
Filed: 1925-03-19
Abstract: 231,186. Chavanne, L. March 19, 1924, [Convention date]. Regenerators; gaseousfuel furnaces.-In heatexchange apparatus of the continuous type, the two fluids (such as hot gases and air to be heated) are circulated to sweep the opposite faces of a thin separating partition, the heating fluid being closely sandwiched between the partition and a body serving to receive and to store for radiation to the partition, heat from that fluid. Preferably the fluid to be heated is similarly treated. Owing to the restricted size of the passages the fluids are easily circulated at speeds high enough to avoid surface film insulation. A number of forms of such passages are described together w i t h apparatus embodying them. Fig. 1 shows a construction in which the two fluids flow in shallow passages formed between walls 10, 11 of heat - radiating material separated by a thin central partition 12. As shown in Fig. 3, the narrow passage 9<a> is helical or it may be a double helix. Figs. 9 and 10 show an assembly of tubular elements such as described above with the spaces between the tubes mainly filled by refractory bodies 10<a>, between which and the tubes circulate the gases derived from a burner 15 or from a furnace exhaust. Fig. 11 shows a type of assembly in which the channels are of rectangular section, the flow being up and down in say the channels 9 and from side to side in the adjacent channel 8. Fig. 14 shows a heater embodying elements of Field-tube type. Heat is supplied by a burner. According to the Specification as open to inspection under Sect. 91 (3) (a) either of the two fluids flows in the narrow passage and many additional forms of passage and forms of apparatus embodying them are described. Thus, the partition 12 may be replaced by a small flattened tube or a small bore circular tube and the single passages constituted by a thin-walled pipe and a heat radiating core of slightly smaller diameter may take various forms. The passages may be corrugated in longitudinal section or, as shown in Fig. 10 (Cancelled), in transverse section. Figs. 12 (Cancelled) and 14 (Cancelled) show helical forms and Figs. 18 (Cancelled) and 19 (Cancelled) show other sections. Polygonal, oval, or flat sections may also be employed. The cores may be porous and may be moulded or consist of piled up fragments. In Fig. 30 (Cancelled), the nest of tubes 12a is rotatable so as to avoid the formation of a hot zone near the inlet 15 for the hot gases. For heating air to a very high temperature sets of such nests may be arranged in series. The tubes may be soldered to the tube plates 23 Fig. 34 (Cancelled), and in the case of nests in series, the tube plates are jointed together by asbestos packing such as 32, Fig. 36 (Cancelled). Fig. 39 (Cancelled) shows a heater unit of symmetrical form adapted for ready coupling in series. A thin-walled tube either of flat section, or round as in Fig. 48 (Cancelled), may be coiled between a core 11<a> and a casing 10<a> of refractory material leaving surrounding narrow passages. This construction provides for temperature expansion difficulties. Flow of hot gases through the heater is equalized by slot-like inlets and outlets such as shown in Figs. 54 (Cancelled), and 55 (Cancelled), 15 being for example an inlet giving good distribution parallel to the axis and 17 an outlet serving a large part of the periphery. A similar object is provided for in the gas-fired heater, illustrated in Figs. 56 (Cancelled) and 57 (Cancelled), where a long narrow port 15<a>, supplied with air and gas from ports 36, 37 is regulated over the length of the port by a series of sliding dampers 38, 39. These dampers may be refractory bricks mounted for movement by means of rollers 42, 43, running in channels 44, 45. With modification, the port 15<a> may be horizontal. This subject-matter does not appear in the Specification as accepted.