DOI: 10.1115/1.4058274 ISSN: 0097-6822

Boiler Test Results With Pre-Heated Air, Colfax Station, Duquesne Light Company

C. W. E. Clarke


This paper describes the apparatus used and gives the results of an extended series of tests carried out in the. summer of 1923 on one of the units of the Colfax Station of the Duquesne Light Company, Pittsburgh, Pa., in which flue-gas air preheaters had been installed. The normal operating rate of evaporating of the boiler employed was the equivalent of 144,000 lb. of water per hour from and at 212 deg. fahr. and the preheater was designed to supply combustion air to the wind box of the stoker at a temperature of 235 deg. fahr. The results obtained show that the efficiency of the unit was increased by from 5 to 7 per cent by the use of the preheater.

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