## Abstract

The components that determine the shape of the flow in Heat Recovery Steam Generator (HRSG) are the inlet duct and the transition zone. After passing through the inlet duct, flue gas is expected to have uniform axial velocity and temperature distribution, with the aim of optimizing pressure drop and reducing residual gas turbulence due to its high velocity. Turbulence can cause uneven flow temperature because there is heat concentrated at a certain point so that it can reduce heat transfer that occurs between flue gas and steam. Thus, an effort is needed so that the flow coming out of the inlet duct has a uniform flow profile and temperature distribution. In this study, researchers will conduct a numerical study in the form of a 2-dimensional simulation using Computational fluid dynamics (CFD) regarding the effect of angle variations on the vertical type HRSG inlet and transition zone on the flow and heat transfer characteristics. Variations of inlet duct angle (beta) and transition zone angle (mathrm{c}x) in this study there are 5 variations, variation 1 (alpha=35{circ}, beta=15{circ}), variation 2 (alpha=35{circ}, beta=25{circ}), variation 3 (alpha=35, beta=30{circ}), variation 4 (alpha=30{circ}, beta=25{circ}), variation 5 (alpha=45{circ},beta=25{circ}). From the simulation results it can be known that inlet duct angle and transition zone affect the flow and heat transfer of gas flue in vertical type HRSG, the greater the angle of mathrm{c}x cause the flow separation, the greater the angle of beta cause the velocity of gas flue flow to be faster. In this simulation, variation 2 (alpha=35{circ}, beta=25{circ}) had the best flow velocity and distribution with an average gas flue velocity of 4.27 m/s, while the highest total heat transfer also occurred at a variation of 2 (alpha=35{circ}, beta=25°) with a total heat transfer of190.2057 MW.

Original language | English |
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Title of host publication | International Electronics Symposium 2021 |

Subtitle of host publication | Wireless Technologies and Intelligent Systems for Better Human Lives, IES 2021 - Proceedings |

Editors | Andhik Ampuh Yunanto, Artiarini Kusuma N, Hendhi Hermawan, Putu Agus Mahadi Putra, Farida Gamar, Mohamad Ridwan, Yanuar Risah Prayogi, Maretha Ruswiansari |

Publisher | Institute of Electrical and Electronics Engineers Inc. |

Pages | 600-605 |

Number of pages | 6 |

ISBN (Electronic) | 9781665443463 |

DOIs | |

Publication status | Published - 29 Sept 2021 |

Externally published | Yes |

Event | 23rd International Electronics Symposium, IES 2021 - Surabaya, Indonesia Duration: 29 Sept 2021 → 30 Sept 2021 |

### Publication series

Name | International Electronics Symposium 2021: Wireless Technologies and Intelligent Systems for Better Human Lives, IES 2021 - Proceedings |
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### Conference

Conference | 23rd International Electronics Symposium, IES 2021 |
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Country/Territory | Indonesia |

City | Surabaya |

Period | 29/09/21 → 30/09/21 |

## Keywords

- CFD
- Flow Characteristics
- HRSG
- Heat Transfer
- Inlet Duct
- Transition Zone