Numerical Study of Gas Mixing Effect on Block 3 and Block 4 Muara Tawar’s Gas Turbine Combustion Stability

Danan Tri Yulianto*, Bambang Sudarmanta

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The power plants managed by PT PJB UP Muara Tawar are peak load power plants with a regular start–stop operation. Blocks 3 and 4 operate gas turbines with Siemens V94.2’s type. Gas turbine fuel comes from three suppliers, namely Nusantara Regas (NR), Pertamina EP (PEP), and PGN with their specific compositions. Combustion stability is the key of operation, so it must be maintained from any disturbances. This aims of the study is to determine the stability of combustion with the parameters; lift off and blow off also analyzed the effect of excess air. This study uses a numerical simulation model with computational fluid dynamics (CFD) with non-premixed combustion model that carried out at 137 MW. The analysis shows that higher composition of fuel gas indicated by methane will decrease the lift off around 0.185 m, and the flame length became longer. The effect of excess air in combustion will lead to the increase in lift by adding more excess air around 0.21 m, and flame length became shorter. Excess air will increase maximum temperature but decreased gradually toward outlet. NOx emission mostly produced by high temperature as higher gas composition will tend to higher NOx production, and the addition of excess air will decrease NOx production as a result of lower temperature. The optimum energy based on outlet temperature is medium gas composition with 15% excess air and also will provide optimal combustion stability, efficiency, and NOx emission values.

Original languageEnglish
Title of host publicationRecent Advances in Renewable Energy Systems - Select Proceedings of ICOME 2021
EditorsMohan Kolhe, Aziz Muhammad, Abdel El Kharbachi, Tri Yogi Yuwono
PublisherSpringer Science and Business Media Deutschland GmbH
Number of pages7
ISBN (Print)9789811915802
Publication statusPublished - 2022
Event5th International Conference on Mechanical Engineering, ICOME 2021 - Virtual, Online
Duration: 25 Aug 202126 Aug 2021

Publication series

NameLecture Notes in Electrical Engineering
ISSN (Print)1876-1100
ISSN (Electronic)1876-1119


Conference5th International Conference on Mechanical Engineering, ICOME 2021
CityVirtual, Online


  • Excess air
  • Flame stability
  • Lift off
  • NOx
  • Natural gas
  • Temperature


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