Turbine heat rate can be divided
as two types:
- Gross
Turbine Heat Rate
Gross turbine
heat rate can be obtained by dividing the heat energy or enthalpy added in
steam boiler among the outlet of steam and the inlet of feedwater by the output
of generator in kW (kilowatt). The gross turbine heat rate can be stated in
kJ/kWh or Btu/kWh. Reheater can be utilized to add heat energy in the steam
turbine and generate reheat cycle. The table 1 below is example of gross
turbine heat rate values.
- Net
Turbine Heat Rate
The net turbine
heat rate can be established similar to gross turbine heat rate, with the
exception of the input power of boiler feed pump is taken away from the output
power of generator previous to dividing towards the enthalpy (heat energy)
which is added in steam boiler.
Turbine heat rate with regard to
regenerative turbine is understood to be the heat energy usage of the turbine
with regards to "enthalpy in steam" provided by the steam boiler,
subtract the "enthalpy in the feedwater" when warmed up by the
extraction in turbine, divided by the power output on the generator. This
description involves electrical and mechanical failure / losses of turbine and
generator process, however excludes boiler ineffectiveness and pumping
deficits. The turbine heat rate is helpful for doing economical evaluations of
different turbine designs and also engineering.
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| Table 1: Gross Turbine Heat Rate |
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