| 摘要 |
<PICT:1118943/C1/1> A gas generator in which free oxygen containing gas entering at 28 and fuel entering at 34 are reacted together in catalytic bed 88, for use for example in reducing the oxygen content of the atmosphere in a food storage system (Fig. 1, not shown), comprises fuel feeding and control means 32 for adding to the free oxygen containing gas a predetermined quantity of fuel which is less than the stoichiometric quantity corresponding to the oxygen content of the gas entering at 28, means for example, gas preheating section 44 for heating the catalytic bed and temperature control means including temperature sensor 90 for varying the output of the heating means in response to the temperature of the catalytic bed. The fuel feeding and control means may include oxygen analyser 92 arranged in the incoming gas stream and operatively connected with valve control means 94 for the fuel line. The preheating section 44 may comprise an open element type electric heater which has wire element 72 wound about insulating spools 52 threaded on support rods to form columns 50. The fuel may be hydrogen, alkanes of up to 5 carbon atoms natural gas, water-gas. Catalysts mentioned are Pt, Ir, Pd deposited on alumina. In alternative embodiments, instead of preheating the gas stream the catalyst bed may be heated by an element within the bed; temperature-sensing means 90 may be downstream of the bed instead of within it; the reactor may be horizontally arranged and of rectangular cross-section. |
