July 2003

Special Report: Plant Utilities/Heat Transfer

Flue gas analysis - a storehouse of information

Here's a step-by-step procedure to determine heater performance

Ghosh, R. K., Haldia Refinery, Inidan Oil Corp.

Furnace and boiler performance is important to optimize fuel usage in any industry. Traditionally, fired heater or boiler efficiencies are evaluated indirectly with stack temperature and flue gas composition. The Betz nomograph is generally used to assess heater performance. Data required to use the Betz chart include flue gas Orsat analysis, fuel hydrogen-to-carbon ratio, stack temperature, and ambient temperature. Difficulty in using the Betz chart appears when the heater is fired with combination fuel, i.e., fuel gas as well as fuel oil. Further, the chart is read manually and, thus, a method to adopt computer calculation is helpful. With increased use of high-sulfur fuel in heaters

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