GDL

Application of Twisted Tapes to Improve The Performance of High Temperature Shift Converter Effluent Trim Cooler in Hydrogen Production Unit

Skripsi, 019 / 2019 / TKE
Undergraduate Theses from JBPTPPOLBAN / 2019-12-12 12:05:19
Oleh : Jannati Syifa - 151734015 (jannatisyifa15@gmail.com)
Dibuat : 2019-12-12, dengan 4 file

Keyword : hydrogen production unit, Hidrogen, heat exchanger, efektivitas, twisted tapes
Subjek : hydrogen production unit, Hydrogen, heat exchanger, effectiveness, twisted tapes

Minyak bumi dari pengilangan Duri dan Minas memiliki kandungan residu sebesar 60-65% yang menjadi residu (bottom product) dari proses pemisahan berdasarkan titik didih komponen penyusunnya. Hidrogen berperan dalam proses perengkahan residu agar bisa diolah menjadi produk yang memiliki nilai jual. Metode steam reforming dengan masukan berupa refinery off gas dan natural gas, akan melalui proses hidrogenasi dan desulfurasi, proses steam reforming, serta proses pemurnian untuk memperoleh Hidrogen murni 99,9% dengan temperatur 104 oF (40oC). Tahap pemurnian terdiri dari dua proses, yaitu High Temperature Shift Converter (HTSC) dan Pressure Swing Adsorption (PSA). Keluaran HTSC memerlukan proses pendinginan agar memenuhi kriteria umpan PSA menggunakan heat exchanger yaitu High Temperature Shift Converter Effluent Trim Cooler. Kondisi aktual operasi menunjukkan temperatur rata-rata Hidrogen keluaran HTSC Effluent Trim Cooler lebih tinggi 9,97oF (5,54oC) dibandingkan dengan kebutuhan umpan PSA, dan kelebihan temperatur tertinggi diketahui sebesar 12,92oF (7,18oC). Data tersebut merupakan acuan untuk perbaikan kinerja perpindahan panas dalam HTSC Effluent Trim Cooler agar mencapai temperatur standar yang dibutuhkan sebagai umpan PSA. Peningkatan tersebut mengindikasikan bahwa perpindahan panas terhambat. Upaya pengoptimalan laju perpindahan panas HTSC Effluent Trim Cooler dilakukan dengan memberikan gangguan pada aliran fluida menggunakan twisted tapes yang dimasukkan ke dalam tube. Penambahan twisted tapes mengakibatkan aliran menjadi turbulen sehingga laju perpindahan panas dapat ditingkatkan. Perancangan berdasarkan metode Kern untuk penambahan twisted tapes yang telah memenuhi kriteria perancangan dapat menghasilkan peningkatan overall heat transfer coefficient 220,88 BTU/ft2hroF, efektivitas meningkat menjadi 0,7353 dengan peluang penghematan energi dapat mencapai 51.429.202.988,62 BTU/tahun. Kata kunci: hydrogen production unit, Hidrogen, heat exchanger, efektivitas, twisted tapes.

Deskripsi Alternatif :

Crude oil from Duri and Minas refineries have residual content of 60-65% becomes residual (bottom product) of the separation process based on the boiling points of its constituent components. Hydrogen plays a role in the residual cracking process so that can be processed into products that have a selling value. The steam reforming method with feeds are refinery off gas and natural gas will go through the process of hydrogenation and desulfuration, the steam reforming process, and the purification process to obtain 99,9% pure Hydrogen with a temperature of 104oF (40oC). The purification stage consists of two processes, namely High Temperature Shift Converter (HTSC) and Pressure Swing Adsorption (PSA). The HTSC output requires a cooling process to meet the PSA feed criteria using a heat exchanger, namely the High Temperature Shift Converter Effluent Trim Cooler. Actual operating conditions show that the average temperature of the Hydrogen output of the HTSC Effluent Trim Cooler is higher at 9.97oF (5.54oC) compared to the requirements of the PSA feed, and the highest excess temperature is known to be 12.92oF (7.18oC). The data is a reference to improve the heat transfer performance in the HTSC Effluent Trim Cooler to reach the required temperature as a PSA feed. This increase indicates that heat transfer is inhibited. Efforts to optimize the heat transfer rate of HTSC Effluent Trim Cooler is done by giving disruption to the flow of fluid using twisted tapes that are inserted into the tube. The addition of twisted tapes causes the flow to be turbulent so that the heat transfer rate can be increased. The design based on the Kern method for the addition of twisted tapes that have met the design criteria can result in an increase of overall heat transfer coefficient of 220,88 BTU/ft2hroF, effectiveness increases by 9,97% with energy saving opportunities reaching 51.429.202.988,62 BTU/year. Keywords: hydrogen production unit, Hydrogen, heat exchanger, effectiveness, twisted tapes.

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