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ITS » Master Theses » Rekayasa Konversi Energi - S2
Posted by anis at 03/01/2009 12:06:44  •  7982 Views


SIMULATION OF SPRAY DISPERSION AND NOZZLE LOCATION AT COMPRESSOR INLET DUCT AIR COOLING AT GAS TURBINE TO COOLING EFFECTIVENESS

Author :
Fauzan, Arif 




ABSTRAK

Turbin gas merupakan mesin yang beroperasi dengan volume tetap dan kecepatan putar spesifik tertentu. Saat temperatur udara sekitar mengalami kenaikan maka kerapatannya akan turun sedangkan rongga volume aliran tetap sehingga aliran massa dan kerja turbin akan mengalami penurunan. Setiap kenaikan temperatur udara sekitar 1C mengakibatkan penurunan kerja turbin sebesar 05-09. Untuk mengatasi masalah tersebut dipakai salah satu metode alat pendingin udara masuk kompresor dengan sistem pengkabutan inlet air fogging. Untuk memudahkan analisa desain sistem pengkabutan diperlukan data profil kecepatan maupun temperatur dan keseragaman penyebaran spray setelah keluar dari nozzle di dalam saluran ducting menuju ke kompresor. Mengingat bentuk saluran udara masuk kompresor pada turbin gas berbeda-beda maka dalam tesis ini disimulasikan penyebaran spray pada saluran udara masuk turbin gas tipe MS6001-General Electric dengan memakai CFD model. Simulasi dilakukan dengan variasi 4 lokasi nozzle yaitu 2 lokasi sebelum silenser dan 2 lokasi setelah silenser dengan masing-masing memakai 2 tipe susunan jarak antar nozzle yaitu jarak rapat dan jarak renggang serta 5 variasi relative humidity yaitu 0 dry air 20 40 60 dan 80. Simulasi dimaksudkan untuk mengetahui lokasi dan jarak antar nozzle dengan efektifitas pendinginan terbaik. Hasil simulasi menunjukkan bahwa lokasi nozzle pada daerah jauh sebelum silenser lokasi-I baik jarak antar nozzle rapat maupun renggang menghasilkan efektifitas pendinginan yang rendah hanya sekitar 5624-6707 . Untuk daerah aliran dekat-sebelum silenser lokasi-II efektifitas pendinginan adalah rendah 5631 untuk jarak nozzle rapat dan tinggi 918 untuk jarak nozzle renggang. Untuk daerah aliran dekat setelah silenser lokasi-III efektifitas pendinginan rendah 5688 untuk jarak antar nozzle rapat dan tinggi 9300 untuk jarak nozzle renggang. Untuk daerah aliran dekat inlet kompresor lokasi-IV efektifitas pendinginan relatif baik 8426 untuk jarak antar nozzle rapat dan 9733 untuk jarak nozzle renggang. Kecepatan evaporasi sangat dipengaruhi oleh relative humidity proses evaporasi berjalan semakin cepat bila sistem pengkabutan beroperasi pada relative humidity yang semakin rendah.


ABSTRACT

Gas turbines are almost constant volume machines at specific rotating speed. The ambient air temperature rises its density falls thus although the volumetric flow rate remain constant the mass flow rate is reduced as ambient air temperature rises and power output is also reduced. The temperature rise because power output is proportional to mass flow rate the power output dropping by 05-09. Every 1C rise in ambient temperature the use of the inlet air cooling inlet air fogging system to eliminate this problem is rapidly increasing. To analysis of the design inlet fogging system needed by data of profile of spray dispersion after exit from nozzle in the compressor air inlet duct and both of velocity and temperature profile. Considering the design of compressor inlet air duct is different each other hence in this paper simulation of spray dispersion was done in the compressor air inlet duct turbine gas type MS6001-General Electric by CFD mode. The simulation conducted with the 3 nozzle locations variation which 2 locations before silencer and 1 location after silencer with each hence 2 formation distance between nozzle that is close distance and estranged distance and also 5 variation of relative humidity that is 0 dry air 20 40 60 and 80The simulation to know the location and distance between nozzle with the best cooling effectiveness. Result of simulation indicate that the nozzle location at far-before silencer location-I both of distance between nozzle close and estranged resulting low cooling effectiveness only about 5624-6707. For the area near-before silencer location II resulting low cooling effectiveness 5631 for distance between nozzle close and hight 918 for distance between nozzle estranged. For the area near-after silencer location III resulting low cooling effectiveness 5688 for distance between nozzle close and hight 930 for distance between nozzle estranged. While the area near inlet compressor location-IV resulting good cooling effectiveness 8426 for distance between nozzle close and 9733 for distance between nozzle estranged. Rate of evaporation very influenced by relative humidity process evaporation done more faster when fogging system operate on the low relative humidity.



KeywordsTurbin gas ; Inlet air fogging ; Simulasi CFD ; Lokasi nozzle ; Efektifitas pendinginan
 
Subject:  Turbin gas
Contributor
  1. Prof. Dr.Ir.Djatmiko Ichsani, M.Eng.
Date Create: 03/01/2009
Type: Text
Format: pdf.
Language: Indonesian
Identifier: ITS-Master-3100007030582
Collection ID: 3100007030582
Call Number: RTM 621.433 Fau s


Source
Master Theses, MAGISTER PROGRAM MECHANICAL ENGINEERING DEPARTMENT RTM 621.433 Fau s, 2007

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Copyright @2007 by ITS Library. This publication is protected by copyright and permission should be obtained from the ITS Library prior to any prohibited reproduction, storage in a retrievel system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to ITS Library




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