Tri Agung Rohmat
Universitas Gadjah Mada Yogyakarta

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COMBINED HEAT AND POWER - OPTIMAL POWER FLOW BASED ON THERMODYNAMIC MODEL WITH ASSOCIATED PETROLEUM AND WET GAS UTILIZATION CONSTRAINTS Pujihatma, Priambudi; Hadi, Sasongko Pramono; Sarjiya, Sarjiya; Rohmat, Tri Agung
International Journal of Electrical and Computer Engineering (IJECE) Vol 9, No 1: February 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1682.941 KB) | DOI: 10.11591/ijece.v9i1.pp42-54

Abstract

Oil fields produce associated petroleum and wet gas, which can be mixed with commercial natural gas as fuel. Associated petroleum and wet gas are a low cost, low quality fuel, whereas commercial natural gas is the opposite. Two parameters are affected by this mixture: the fuel cost and the power ? steam output of gas turbine ? heat recovery steam generators. This research develops a Unit Commitment and Optimal Power Flow model based on Mixed Integer Nonlinear Programming to optimize combined heat and power cost by considering the optimal mixture between associated petroleum - wet gas and commercial natural gas. A thermodynamic model is used to represent the performance of gas turbine ? heat recovery steam generators when subjected to different fuel mixtures. The results show that the proposed model can optimize cost by determining the most efficient power ? steam dispatch and optimal fuel mixture. Furthermore, the optimization model can analyse the trade-off between power system losses, steam demand and associated - wet gas utilization. 
KAJI EKSPERIMENTAL BIOMASA SEKAM PADI PADA CYCLONE BURNER Purwanto, Sigit; Rohmat, Tri Agung
Prosiding Semnastek PROSIDING SEMNASTEK 2015
Publisher : Universitas Muhammadiyah Jakarta

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Abstract

Cyclone burner berbahan bakar sekam padi (rice husk) merupakan teknologi pembakaran langsung dengan memanfaatkan aliran pusar. Desain unit cyclone burner yang digunakan pada penelitian ini adalah skala lab dengan bahan bakar sekam padi berbentuk serbuk. Penelitian ini juga mempelajari tentang pengaruh variasi ukuran partikel biomasa, laju aliran biomasa, dan laju aliran udara terhadap temperatur pembakaran di dalam ruang pembakaran cyclone burner. Proses persiapan bahan bakar sekam padi untuk mendapatkan variasi ukuran partikel di dalam penelitian ini meliputi beberapa tahap yaitu  proses pengeringan, reduksi ukuran partikel dan pengayakan. Proses pembakaran dan proses pencampuran antara bahan bakar dengan udara berlangsung secara bersamaan di dalam ruang pembakaran cyclone burner. Pengamatan distribusi temperatur pembakaran menggunakan termokopel yang dipasang sebanyak 3 (tiga) titik ke arah aksial dan radial. Hasil pengujian menunjukkan bahwa ukuran partikel bahan bakar yang semakin kecil menghasilkan temperatur pembakaran lebih optimum hingga mencapai temperatur 858 0C pada AFR 8,37. 
Identifikasi Pola Aliran Dua Fasa Uap-Kondensat Berdasarkan Pengukuran Beda Tekanan pada Pipa Horisontal Sukamta, Sukamta; Indarto, Indarto; Purnomo, Purnomo; Rohmat, Tri Agung
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
Publisher : Jurnal Semesta Teknika

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Abstract

An experiment of two-phase flow patterns of steam-condensate based on differential pressure measurement in horizontal tube was conducted by varying the flow rate of the steam. The experiment utilised annulus pipe with inner section test pipe was made from copper and outer section was made from Galvanized Iron Pipe (GIP) wrapped with a 10-mm-thick insulation. The pipe was 1.6 meter length, and 4 inch outer diameter and 17 mm inner diameter. The two-phase flow regime was investigated based on pressure gradien between its inlet and outlet. In order to support the result, visualition was conducted using a ¾ inch diameter and 1.3 m length of transparent pipe connected with the test pipe section. Five variations of steam flow rate ranging from 0.00211361 m3/s to 0.007078511 m3/s were selected. The results show that for lowest steam flow rate, stratified flow pattern was identified while for the ot her variations, stratified, wavy, plug and slug flow pattern were observed. Wavy flow pattern occured on transition of stratified to slug or plug. Annular flow pattern was not observed in this experiment. Generally speaking, an increase in steam flow rate resulted in a more significant pressure gradient signals.