| 摘要 |
592,389. Gas-heating furnaces. AKT.-GES. FUR TECHNISCHE STUDIEN. May 23, 1945, No. 12879. Convention date, May 26, 1944. [Class 51 (i)] [Also in Groups XIII, XXVI and XXVII] In a closed circuit power plant in which a gaseous medium is compressed, heated from an external source and then expanded in a turbine, the supply of heat takes place in a heater having at least two combustion chambers one of these bemg located in front of all the heating surfaces of the heater and the other between heating surfaces of the heater and the flue gases from the outlet side of the heater are branched back only to the combustion chamber in front of all the heating surfaces. In the combustion chamber between the heating surfaces the temperature is maintained at the desired value by flue gases coming from the preceeding heating surfaces. The Figure shows a heater A having combustion chambers 1, 2 and heating surfaces comprising tubular heat-exchangers 3, 4. Compressed air from a compressor (not shown) enters at 7 and passes by heat-exchanger 4, pipe 8, heatexchanger 3 and pipe 8 to the turbine (not shown). The combustion chamber 1 is situated in front and at the bottom of the heat-exchanger 3 while the combustion chamber 2 is situated between the heat-exchangers and in part at the top of the heat-exchanger 4. Flue gases branched back through a pipe 9 are passed only to the combustion chamber 1. A fan 10 driven by a motor M may be used to return the gases. Some of the flue gases may be branched off to heat fuel and combustion air for the combustion chambers. There may be more than two combustion' chambers.
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