Fired heaters weight

Compensating fuel gas flow measurement for variations in pressure, temperature and molecular weight requires careful attention. Done for accounting purposes, it can seriously degrade the performance of fired heater and boiler control schemes. Chapter 10 presents fuU details on how it should be done. 

Fired-tube furnaces (or heaters) are widely used in the process industries to heat process streams and to crack high-molecular-weight hydrocarbon feeds, in order to produce more valuable lower-molecular-weight compounds. In this case study, we consider a fired-tube furnace used to heat a liquid hydrocarbon feed steam that passes through the furnace in a set of tubes. A simplified schematic diagram is shown in Fig. 13.8. The combustion of the fuel gas (FG) generates heat, which is transferred to the hydrocarbon (HC). The major gaseous combustion reactions in the furnace are... 

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