From the thermo dynamic stand point, energy recovery from the Rankin cycle is more dependent on the temperature than the pressure. Hence, higher the steam temperature , higher the cycle efficiency. However, the limits on temperature are influenced by the metallurgy of the boiler tubing, piping and the turbine components. Carbon steel can be used up to a working metal temperature of 400°C. Beyond this temperature, alloy steels are extensively used. The characteristics of the fuel used in the boiler (e.g. : bagasse) also can pose limitations on the choice of steam temperature. The following are the steam parameters that are widely used in a process industry.
•Pressure (kg/cm2(a)) Temperature (0C)
32 380
42 440
67 485
84 520
110 540
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