Performance Efficiency of Heat Recovery Steam Generator (HRSG) Unit 822-B-202 at TPPI Refinery

The steam generator is vital equipment in oil and gas refinery industry. One of the steam generator
equipment in TPPI Refinery other than boiler is Heat Recovery Steam Generator (HRSG). Determine
efficiency performance HRSG Unit 822-B202 in this research using compare between energy heat flow for
produce steam and energy heat flow from exhaust gas on HRSG stack. The analyze result of efficiency
HRSG Unit 822- B-202 when Start-up Commissioning was gotten 96.42%, on September 2021 92.47%,
on October 2021 91.46% and November 2021 88.41%. Has occurred decrease of efficiency from start-up
Commissioning until November 2021 about 16.95%. Over the past 3 months, efficiency has tended to
decrease since commissioning. The calculated decrease in efficiency after commissioning in September
was 3.96%. Then from September to October it decreased by 4.97%. However, in November it decreased
again by 8.02%. So, the accumulated decrease in efficiency of HRSG 822-B-202 during the quarter from
Commissioning to November 2021 is 16.95%. So, the average decrease in efficiency per month is 5.65%.
The decrease in efficiency is caused by changes in the flow of Feed Water and Superheater. If the Feed
Water Flow value is smaller and the Superheater Flow value is relatively small, then the HRSG efficiency
value will be smaller.