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Multi-Fuel Boiler Efficiency Calculations
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With increasing energy costs, the use of waste fuels has become commonplace in the petroleum and petrochemical industries. The American Society of Mechanical Engineers Power Test Codes date back to 1915, but do not directly approach the subject of multiple fuels. Instead, the codes reference an article published in the ASME Transactions in August, 1956. In this paper, the efficiency calculations were based on a 'total' analysis of the stack gases using an Orsat type analysis. That approach has been updated in the current paper. Several important areas concerning the determination of boiler efficiency are discussed. The various heat and material balance equations used are discussed in detail. When multiple fuels are present, additional information is required, including fuel analyses and fuel rates. The fuel properties must be combined in an appropriate manner to determine the overall fuel properties. A total stack analysis is required for the indirect efficiency calculations. This analysis may be done either on-line or in the laboratory by chromatography. A method estimating the total stack analysis using only an oxygen analyzer and carbon monoxide analyzer is shown. Examples of multi-fuel efficiencies for four industrial boilers are presented and discussed. The testing program for determining efficiency models is discussed.
Likins, M. R., Jr. (1984). Multi-Fuel Boiler Efficiency Calculations. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from