ANALISIS TERMAL SIKLUS UAP CONDENSING TURBINE DAN COMBINED CYCLE UNTUK WASTE HEAT RECOVERY PADA PT. ASAHIMAS FLAT GLASS, TBK

WIBOWO, ZEFANYA HIRO (2017) ANALISIS TERMAL SIKLUS UAP CONDENSING TURBINE DAN COMBINED CYCLE UNTUK WASTE HEAT RECOVERY PADA PT. ASAHIMAS FLAT GLASS, TBK. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

PT. Asahimas Flat Glass, Tbk. merupakan industri besar yang bergerak pada proses pembuatan kaca. PT. Asahimas Flat Glass, Tbk. Sidoarjo memiliki kapasitas produksi sebesar 300.000 ton/tahun. Proses pembuatan kaca mengalami beberapa tahap pemrosesan terutama pada tahap furnace. Tahap furnace menggunakan bahan bakar gas dan merupakan tahap awal dari proses pembuatan float glass. PT. Asahimas Flat Glass, Tbk memiliki dua furnace yaitu jalur A1 dan A2 dengan bahan bakar yang digunakan adalah gas. Panas buang (waste heat) dengan temperatur berkisar 400oC – 500oC dibuang melalui stack. Agar panas buang tersebut tidak mencemari lingkungan, maka perlu ada pemanfaatan lanjut. Pemanfaatan panas buang dapat dilakukan dengan berbagai cara salah satunya dengan mengubah waste heat menjadi energi listrik. Organic Rankine Cycle merupakan salah satu sistem pembangkit daya yang menggunakan panas buang. Organic Rankine Cycle menggunakan fluida kerja organik diantaranya silicon oil, hydrocarbon, fluorocarbon dan refrigerant. Hal–hal diatas akan dianalisis lebih lanjut pada tugas akhir ini. Tahap awal pengerjaan tugas akhir ini adalah identifikasi permasalahan dan studi literatur. Tahap kedua adalah perhitungan nilai temperature gabungan, pembuatan model serta penyelesaian dengan software Cycle Tempo 5.1. Variasi massa uap yang digunakan adalah 4.3 kg/s, 4.6 kg/s, 5 kg/s. Selain variasi massa uap, jenis refrigeran yang digunakan R-11, R113, R114. Pada sistem ORC, temperatur evaporating dan temperatur flue gas pada stack juga divariasi. Temperatur evaporating dinaikan menjadi 160oC dan temperatur stack diturunkan menjadi 120oCTahap terakhir adalah hasil pengolahan data tersebut disajikan secara kuantitatif berupa grafik dan tabel. Penelitian ini berawal pada temperatur evaporating sebesar 140oC. Grafik yang dihasilkan menunjukan bahwa semakin besar massa uap, maka semakin besar pula performa combined cycle. Kondisi ini dikarenakan kontribusi yang cukup dominan dari sisi steam turbine, sedangkan pada ORC menghasilkan performa yang lebih kecil. Performa combined cycle yang paling besar adalah 5.89 MW dengan laju alir massa uap 5kg/s. Selain itu, temperatur evaporating serta temperatur flue gas pada stack berpengaruh terhadap performa combined cycle. Temperatur evaporating sebesar 160oC menghasilkan performa combined cycled hingga 5.96 MW dengan laju alir massa uap 5kg/s. Penurunan temperatur flue gas menjadi 120oC menghasilkan daya terbesar yaitu 6.30 MW. Peninjauan selanjutnya yaitu terhadap pemilihan refrigeran. Dari grafik yang dihasilkan, menunjukan bahwa refrigeran jenis R-11 dapat menghasilkan daya ORC yang paling besar karena perbedaan enthalpy yang terbesar. ========================================================================================================= PT. Asahimas Flat Glass, Tbk. is one of the biggest industries which produces glasses. Production capacity of PT. Asahimas Flat Glass, Tbk. Sidoarjo is 300.000 ton/year. The most important process in glass production is the furnace section. This section uses gas as fuel and the first step in production float glass. PT. Asahimas Flat Glass, Tbk has two furnaces, line A1 and A2. The furnace’s waste heat, which still has a temperature around 400oC – 500oC, is often released directly to the surrounding using stack. To reduce air pollution caused by the high waste heat temperature, we must implement a waste heat reusing scheme, such as by using an ORC to convert waste heat as the heat source into electricity. The purpose of waste heat recovery is reducing air pollution. Waste heat from furnace become heat source to produce electricity. Organic Rankine Cycle is power plant system which is use waste heat as heat source. Organic Rankine Cycle uses organic fluids, for instance silicon oil, hydrocarbon, fluorocarbon and refrigerant, as its working fluid. In this final project we will analyze and explain all aforementioned conditions in implementing ORC as a waste heat recovery scheme The first step to do this final project is problem identification and literary study. Then we will calculate both stacks temperatures, make a plant model, finishing and evaluate using software Cycle Tempo 5.1. Variation of steam mass flow rate used are 4.3 kg/s, 4.6 kg/s, 5 kg/s. In conjunction to the steam mass flow rate variation, we will also use R-11, R113 and R114 as the work fluid variation. In ORC, the evaporating temperature and both stacks flue gas temps will also be variated, with evaporating temperature increased to 160oC and the stacks temps decreased to 120oC. The final step in this final project is to plot the results into graphs and tables Final step is analyzing data and showing graph also table. The starting value for the evaporating temperature in this research is set to be 140. The resulting graph shows that an increase of steam mass flow rate will also increase the combined cycle’s performance. The highest combined cycle perform is 5.89 MW with steam mass flow rate 5 kg/s. Both the evaporating temperature and the stacks’ flue gas temperature also yield a change in the combine cycle performance; in a steam mass flow rate of 5 kg/s, a higher evaporating temperature (160oC) results in a higher combined cycle performance (5.96 MW), while, similarly, a lower flue gas temperature (120oC) also yields a higher combined cycle performance (6.3 MW). By varying the working fluids, it is then found that R11 can produce the highest performance, due to its ability to create high enthalpy difference.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Condensing Turbine, Combined Cycle, Flue Gas, Organic Rankine Cycle, Refrigeran, Temperatur Evaporating
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction
Divisions: Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User: ZEFANYA HIRO WIBOWO
Date Deposited: 24 Jan 2017 04:23
Last Modified: 06 Mar 2019 02:44
URI: http://repository.its.ac.id/id/eprint/2905

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