GB1216774A - Heat exchanger utilising an intermediate liquid heat carrier - Google Patents

Abstract

1,216,774. Regenerative heat exchangers. SOC. GRENOBLOISE D'ETUDES ET D'APPLICATIONS HYDRAULIQUES. 22 March, 1968 [24 March, 1967], No. 13998/68. Heading F4K. In a system for heat exchange between a hot gas and a cold gas, an intermediate heat carrier fluid, e.g. liquid or fluidized material is placed in direct contact (e.g. in a chamber 1 or 3) with at least one of said gases by bubbling the gas through the fluid which bubbling action also circulates the fluid through the system. In the apparatus shown in Fig. 2 the gas A to be heated enters the chamber 3 through nozzles 4 and bubbles through a liquid heat carrier therein causing the level to rise and overflow through duct 13 leading to a chamber 1 into which is injected through nozzles 2 a stream of heating gas F. Overflow liquid from chamber 1 is carried through duct 12 to chamber 3 to complete the cycle. The respective gases separate out of the liquid to the upper part of the chambers 1 or 3 from which they are removed at 5 and 6. If the nature of the gases is such that they cannot be brought into contact with the same liquid, then a circuit using two heat carrier liquids may be utilized. The liquids then chosen are immiscible and of different densities and a further chamber is utilized in which the two heat carrier liquids are brought into contact for heat exchange with one another and subsequent separation due to their differing densities (Fig. 3, not shown). Fig. 5 shows a further arrangement utilizing two heat transfer chambers 14, 15 in the flow of a gas A to be heated and two heat transfer chambers 16, 17 in the flow of a hot gas F. One liquid heat carrier circulates between chambers 15 and 16 in a circuit f 2 , and another liquid heat carrier circulates between chambers 14 and 17 in a circuit f 1 . Alternatively one liquid only, may traverse the four chambers. The gas A after compression and subsequent heating in passing through chambers 14 and 15 passes to an MHD generator 35 the exhaust gases from which after giving up heat in chambers 16 and 17, are utilized in a steam power unit 37.