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Siti Alimah
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ANALISIS KOMPARASI HTGR TIPE PRISMATIK DAN PEBBLE BED Siti Alimah; Erlan Dewita; Sudi Ariyanto
Jurnal Pengembangan Energi Nuklir Vol 16, No 1 (2014): Juni 2014
Publisher : Pusat Kajian Sistem Energi Nuklir, Badan Tenaga Nuklir Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jpen.2014.16.1.2554

Abstract

ABSTRAK ANALISIS KOMPARASI HTGR TIPE PRISMATIK DAN PEBLLE BED. Telah dilakukan analisis komparasi High Temperature Gas-Cooled Reactor (HTGR) tipe prismatik dan pebble bed. HTGR adalah salah satu kandidat untuk pembangkit listrik masa depan dan aplikasi panas untuk industri. Fitur desain HTGR saat ini, bermoderator grafit, teras berpendingin helium dan partikel bahan bakar berlapis TRISO yang didispersikan dalam matriks grafit.  Masing-masing tipe teras HTGR tersebut masing-masing mempunyai kelebihan. Studi ini bertujuan membandingkan HTGR prismatik dan pebble bed sebagai alternatif PLTN di Indonesia. Metodologi yang digunakan adalah kajian literatur dan analisis dengan membuat nilai bobot berdasar aspek strategi nasional dan tekno ekonomi. Aspek strategi nasional meliputi tujuan PLTN dibangun, rating daya pembangkit dan ketersediaan teknologi fabrikasi elemen bakar. Aspek tekno-ekonomi meliputi  keselamatan umum, teknologi teruji, kinerja pembangkit, kemudahan produksi elemen bakar, umur desain, interval siklus pengisian bahan bakar, efisiensi thermal, penyederhanaan, kemudahan operasi dan perawatan serta proteksi fisik. Hasil analisis menunjukkan bahwa HTGR prismatik dan pebble bed, masing-masing mempunyai nilai terbobot 4,546 dan 3,823 dari nilai tertinggi 5 sehingga HTGR pebble bed memiliki nilai lebih unggul dibanding HTGR prismatik. Kata kunci : HTGR, prismatik, pebble bed, aspek strategi nasional, aspek tekno-ekonomi, PLTN ABSTRACT COMPARATIVE ANALYSIS OF HTGR TYPE PRISMATIC AND PEBBLE BED. Analysis comparative of High Temperature Gas-Cooled Reactor (HTGR) type prismatic and pebble bed has been carried out. HTGR is one of candidates for future electricity plant and industrial process heat applications. Current HTGR design features graphite moderated, helium cooled cores and TRISO coated fuel particles dispersed in a graphite matrix.  Each type of HTGR cores has certain advantage. The purpose of this study is to compare of HTGR type prismatic and pebble bed as NPP alternative in Indonesia. The used methodology was literature assessment and analysis by making the weighing factor based on aspects of national strategic and techno-economic. National strategic aspects covers the purpose of NPP is constructed, rating power plant and availability of fuel element fabrication technology. Techno-economic aspects includes general safety, proven technology, plant performance, fuel element productability, design life, refueling cycle, thermal efficiency, simplicity, operability and maintability, also physical protection. The results of the analysis show HTGR type prismatic and pebble bed, each has weighed point 4.546 and 3.823 of 5 as the highest, so HTGR pebble bed superior than HTGR prismatic. Keywords : HTGR, prismatic, pebble bed, national strategic aspect, techno-economic aspect, NPP
ANALISIS PASOKAN PANAS PADA PRODUKSI HIDROGEN PROSES STEAM REFORMING KONVENSIONAL DAN NUKLIR Siti Alimah; Djati Hoesen Salimy
Jurnal Pengembangan Energi Nuklir Vol 17, No 1 (2015): Juni 2015
Publisher : Pusat Kajian Sistem Energi Nuklir, Badan Tenaga Nuklir Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jpen.2015.17.1.2614

Abstract

ABSTRAK ANALISIS PASOKAN PANAS PADA PRODUKSI HIDROGEN PROSES STEAM REFORMING KONVENSIONAL DAN NUKLIR. Telah dilakukan analisis pasokan energi panas pada produksi hidrogen dengan proses steam reforming gas alam. Tujuan studi adalah untuk memahami sistem pasokan energi panas konvensional dan dengan nuklir. Metodologi yang digunakan adalah kajian literatur dan analisis berdasar perbandingan. Hasil studi menunjukkan bahwa proses dengan sumber panas bahan bakar fosil (gas alam) mampu memberikan kondisi operasi optimum temperatur 850-900oC dan tekanan 2-3 MPa, serta dengan perpindahan panas didominasi oleh perpindahan panas radiasi, sehingga fluks panas yang dapat dicapai pada tabung katalisator relatif tinggi (50-80 kW/m2) dan menghasilkan efisiensi thermal yang tinggi yaitu sekitar 85%. Sedang pada sistem dengan energi nuklir, karena tuntutan keselamatan, proses beroperasi pada kondisi yang kurang optimum temperatur 800-850oC dan tekanan 4,5 MPa, serta dengan perpindahan panas didominasi oleh perpindahan panas konveksi, sehingga fluks panas yang dapat dicapai pada tabung katalisator jauh lebih rendah (10-20 kW/m2) dan menghasilkan efisiensi thermal yang rendah sekitar 50%. Modifikasi reformer dan utilisasi panas mampu meningkatkan fluks panas sampai 40 kW/m2 sehingga efisiensi thermal dapat mencapai 78%. Meskipun demikian, aplikasi energi nuklir untuk produksi hidrogen dengan proses steam reforming mampu menghemat pembakaran bahan bakar fosil yang berimplikasi pada potensi penurunan laju emisi CO2 ke lingkungan. Kata kunci: produksi hidrogen, steam reforming, reformer, HTGR ABSTRACT HEAT SUPPLY ANALYSIS OF STEAM REFORMING HYDROGEN PRODUCTION PROCESS IN CONVENTIONAL AND NUCLEAR. The analysis of heat energy supply in the production of hydrogen by natural gas steam reforming process has been done. The aim of the study is to compare the energy supply system of conventional and nuclear heat. Methodology used in this study is an assessment of literature and analysis based on the comparisons. The study shows that the heat sources of fossil fuels (natural gas) is able to provide optimum operating conditions of temperature and pressure of 850-900oC and 2-3 MPa, as well as the heat transfer is dominated by radiation heat transfer, so that the heat flux that can be achieved on the catalyst tube relatively high (50-80 kW/m2) and provide high thermal efficiency of about 85%. While in the system with nuclear energy, due to the demands of safety, process operating at less than optimum conditions of temperature and pressure of 800-850oC and 4.5 MPa, as well as the heat transfer is dominated by convection heat transfer, so that the heat flux that can be achieved catalyst tube is relatively low (10- 20 kW/m2) and it provides a low thermal efficiency of about 50%. Modifications of reformer and heat utilization can increase the heat flux up to 40 kW/m2 so that the thermal efficiency can reach 78%. Nevertheless, the application of nuclear energy to hydrogen production with steam reforming process is able to reduce the burning of fossil fuels which has implications for the potential decrease in the rate of CO2 emissions into the environment. Keywords: hydrogen production, steam reforming, reformer, HTGR 
Co-Authors Djati Hoesen Salimy Erlan Dewita Sudi Ariyanto