Path: TopS2-ThesesChemical Engineering-FTI2007

KAJIAN MODIFIKASI UNIT REFORMING PABRIK AMONIAK PUSRI III DAN KAJIAN PI MANFAATAN GAS PRODUSER SEBAGAI BAIIAN BAKAR PENGGANTI GAS ALAM DI PT PUPUK SRIWIDJAJA

THE STUDY OF MODIFICATION FOR REFORMING UNIT OF AMMONIA PLANT PUSRI 3 AND UTILIZATION OF PRODUCER GAS AS NATURAL GAS FUEL SUBTITUTE IN PT PUPUK SRIWIDJAJA

Master Theses from JBPTITBPP / 2017-09-27 14:51:59
Oleh : Junaedi NIM: 23005005, S2 - Chemical Engineering
Dibuat : 2007-01-00, dengan 6 file

Keyword : KRES-revamp ; fuel ; gas ; amonia plant ; pusri ; utilization ; natural gas ; pupuk sriwijaya ; reforming unit; gas produser; energy efisiention .
Nomor Panggil (DDC) : T 661.34 JUN

Abstrak:




Sehubungan dengan kecenderungan kenaikan harga dan ketidak-pastian pasokan gas alam, PT Pupuk Sriwidjaja telah menyusun rencana penghernatan konsumsi gas alam dengan modifikasi proses maupun pemanfaatan batubara sebagai bahan bakar altematif. Penelitian ini berkaitan dengan upaya-upaya modifikasi proses di Unit Reforming dengan teknologi baru yang dinyatakan hemat energi: KBR Reforming Exchanger System dan AutoThermal Rerfomer. Kajian dilakukan terhadap empat konfigurasi proses produksi gas sintesis:




a. existing unit yang terdiri dan primary and secondary reformers




b. KRES yang berupa unit baru pengganti existing unit




c. ATR yang berupa unit barn pengganti existing unit




d. KRES-revamp yang menggabung KRES dengan existing unit




Kajian dilakukan dengan jalan membandingkan efisiensi energi antar keempat konfigurasi proses. Pada kajian ini, variabel proses yang dijaga tetap adalah: laju produksi H2, perbandingan mol H2/CO, dan temperatur keluaran WHB. Kajian kelayakan ekonomi dilakukan untuk KRES revamp terhadap existing unit. Studi kasus dilakukan pada unit reforming di PUSRI-III.




Secara termodinamika, teknologi produksi gas sintesis KRES-revamp, KRES, ATR terbukti lebih efisien dan dapat mengurangi konsumsi gas alam untuk pabrik amoniak berturut-turut 9%, 15% dan 20% dari kebutuhan gas alam untuk reformer konvensional sebesar 37,15 MMBtu/MT NH3. Walaupun efisiensi energi lebih baik, teknologi-teknologi tersebut juga memerlukan modifikasi steam system dan mengakibatkan penambahan auxiliary boiler dengan kapasitas berturut-turut: 105, 137 dan 97 ton/jam.




Selanjutnya kajian diperdalam untuk KRES-revamp, antara lain, karena modifikasinya masih memanfaatkan primary reformer yang telah ada. Di antara tiga kasus yang dikaji secara terpisah, KRES-revamp dengan kapasitas produksi amonia tetap (1200 MTPD NH3) dan primary reformer throughput turun dipertimbangkan paling baik dibandingkan terhadap dua kasus lainnya yaitu: primary reformer throughput sesuai asal dan kapasitas produksi 115% (1380 MTPD NH3) dan primary reformer throughput sesuai asal dan kapasitas produksi 135% (1620 MTPD NH3). Penerapan KRES revamp dengan kapasitas produksi amonia tetap 1200 MTPD (kasus yang pertama) dapat menurunkan biaya produksi hingga 8,39%Itahun. Hanya dengan memperhatikan investasi untuk tambahan KRES dan tambahan auxilliary boiler, Payback Period diperkirakan 10 bulan.

Deskripsi Alternatif :

Abstract:




This study dealt with an energy conservation program at the reforming unit in PT PUSRI, to anticipate the increase in price and possible shortage of natural gas in the near future. A potential reduction of natural gas consumption was evaluated based on thermodynamic modeling and simulation. Three process modifications were studied and their performance had been compared to the existing unit:




a. KRES (KBR Reforming Exchanger System); totally replace the existingprimary reformer




b. ATR (AutoThermal Reformer): totally replace the existing primary reformer




c. KRES-revamp: appending KRES on the existing unit




In the modeling and simulation, the following targets had been set: H2 production rate and molar ratio of H2/CO.




Compared to that of the existing reformer of 37.15 MMBtu/metric ton of NH3, the natural gas consumption in the proposed modified process were lower by 9%, 15% and 20% in KRES-revamp, KRES and ATR respectively. Unfortunately, the proposed modified process produced less steam as by-product due to the decrease in waste sensible heat. Therefore to restore the steam supply, the proposed modified process required an additional auxiliary boiler with a capacity of 105 tons/hour for KRES-revamp, 137 tons/hour for KRES, and 97 tons/hour for ATR.




KRES-revamp had been considered as the most attractive modification, since it would still utilize the existing primary reformer. Further simulation on the operation of KRES-revamp showed that maintaining the existing primary reformer throughput and increasing the ammonia production rate due to the appending KRES was not attractive. The best modification was maintaining the ammonia production rate at the original of 1200 MTPD, while reducing the throughput of the existing primary reformer as part of its load would be replaced by KRES. This modification might give an annual natural gas saving of about 8.39%. Beside that, based on investment aspect, KRES-revamp is very attractive with payback period about 10 months.

Copyrights : Copyright Â(c) 2001 by ITB Central Library. Verbatim copying and distribution of this entire article is permitted by author in any medium, provided this notice is preserved.

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  • Pembimbing 1 : Herri Susanto,Dr. ;




    Pembimbing 2 : Benny Haryoso, MT,Ir.




    Scanner: Alice Diniarti; 2008-01-23.
    , Editor: Alice Diniarti

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