Basic Theory of Efficiency Turbine
Rankine cycle is a cycle that occurs in the steam power
system as a whole. This cycle can be used to determine the performance of the
equipment - equipment that is on the system. For the Rankine cycle working on a
steam turbine generator , for example, can be described as follows:
Figure 1 Ideal and
Actual Rankine Cycle At STG
where:
- Process 1-2: Expansion of the actual work on the turbine of dry steam at 1 to pressure extraction conditions
- Process 1 - 2s: isentropic expansion of the work on the turbines of dry steam at 1 to pressure extraction conditions
- Process 2-3: Expansion of the actual work of dry steam turbine to the condenser pressure conditions of 2 to
- Process 2s - 3s: isentropic expansion of the work on the turbines of dry steam at pressure conditions
- Process 3-4: The release of heat at constant pressure that occurs in the condenser with condition 4 saturated liquid
- Process 3s - 4: Release of heat at constant pressure that occurs in the condenser with liquid saturated condition 4
- Process 4-5: isentropic compression acting on the pump
- Process 5-1: Heat transfer at constant pressure in the boiler
There are several methods to locate the turbine efficiency,
one with the mass and energy balance calculations, where the mass and energy
balance is the ratio between the total mass of the incoming and outgoing steam
turbine with pressure and temperature with the power generated by the
generator. Scheme of the mass balance and the energy in the steam turbine
generator can be described as follows:
Figure 2 Scheme of
Equilibrium Mass and Energy 51 G 2
with reference to the mass and energy balance scheme above,
then to calculate the theoretical power turbine can be formulated as follows:
and to calculate the actual turbine power can be formulated:
In the calculation of this efficiency, the daily data were
taken at random in July 2009 as many as 10 data and will be calculated:
a. Actual efficiency on the daily load
b. Actual turbine efficiency compared with that seen in the
data manufacturing steam folder
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