Abstract:
Abstract
This study purpose to determine the performance of steam turbines Unit 3 of PT.PLN
(Persero) Pembangkitan Asam-asam by comparing the results of the data obtained by each
performance test. This research was carried out by taking data performance tests in 2012,
2017, 2018 and 2019 and then processing the data and obtaining turbine heat rate values
and average turbine efficiency then comparing the values obtained in each year. The data
taken is obtained from the rendal operation of PT.PLN (Persero) Pembangkitan Asam-asam,
data variables taken are load, main steam temperature inlet, main steam pressure inlet, HP
heater feed outlet temperature, HP heater outlet pressure, main steam flow. Temperature and
pressure obtained are then searched for enthalpy values. The data obtained to calculate the
value of the turbine heat rate and turbine efficiency on average per time from each
performance test then averages the value of the turbine heat rate and turbine efficiency each
time the data collection performance test is then compared with the data each year.The
calculation of the turbine heat rate uses the heat & mass balance method by measuring the
value of the incoming and outgoing fluid differences and comparing the load obtained, the
efficiency of the turbine is obtained by dividing the energy of 1 kW with a turbine heat rate
then multiplying by 100%. The average turbine heat rate calculation result for each
performance test which is on May 23, 2012 is 2,701, October 27, 2017 is 3,136, September 5,
2018 is 3,005, May 21, 2019 is 3,113. The average turbine efficiency value on May 23, 2012
is 37.02%, October 27 2017 is 31.39%, September 5 2018 is 33.28%, May 21, 2019 is
32.12%. The performance of PT PLN (Persero) Pembangkit Asam-asam Implementing Unit
Unit 3 has decreased from 2012 to 2019 which is 4.9%
