Desain Plantwide Control Pada Proses Gas Sweetening Absorber Untuk Proses Produksi Liquified Natural Gas (LNG)

Isbar, Ahmad Ufi (2021) Desain Plantwide Control Pada Proses Gas Sweetening Absorber Untuk Proses Produksi Liquified Natural Gas (LNG). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Gas sweetening plant merupakan pemrosesan gas alam yang dimana mengubah sour gas (gas alam yang mengandung CO2 dan H2S) menjadi sweet gas (gas alam yang mengandung CO2). Gas alam yang mengandung CO2 dan H2S ini bertemu dengan pelarut aliran yang mengandung larutan MDEA di kolom absorber. Permasalahan dari plant ini berupa interaksi antar unit saat dikendalikan. Kemudian dengan adanya material recycle (larutan amine), heat integration, dan komponen kimia yang beragam. Produksi gas dari sumur yang berubah-ubah setiap waktu juga menjadi gangguan pada plant. Karena beberapa hal tersebut, dibutuhkan metode yang dapat melakukan pengendalian kompleks dalam menyelesaikan masalah ini. Penerapan metode Plant Wide Control telah berhasil dilakukan pada plant Gas Sweetening, yang bertujuan untuk memaksimalkan profit, memaksimalkan laju produk dan kestabilan plant. Dengan menerapkan metode PWC mendapatkan respon yang lebih optimal jika dibanding dengan metode kontrol PID dan FF. Dengan hasil saat uji naik setpoint 5% mendapatkan settling time 140s, maximum overshoot 0.14%, error steady state 4,52%, dan nilai IAE 18965624,05. Sedangkan saat uji turun setpoint 5% mendapatkan settling time 141s, maximum overshoot 1.64%, error steady state 4,37%, dan nilai IAE 18974602. Dari segi analisa ekonomi, penggunaan PWC dapat meningkatkan profit sebesar 652803,96 U$/h, atau lebih besar 501,41 U$/h dari PID dan 125,07 U$/h dari FF saat uji naik setpoint 5%. Dan profit sebesar 597709,88 U$/h, atau lebih besar 212,44 U$/h dari PID dan 154,9 U$/h dari FF. ================================================================================================= Gas sweetening plant is a natural gas processing which converts sour gas (natural gas containing CO2 and H2S) into sweet gas (natural gas containing CO2). This natural gas containing CO2 and H2S meets the flow solvent containing the MDEA solution in the absorber column. The problem with this plant is the interaction between units when it is controlled. Then with the recycle material (amine solution), heat integration, and various chemical components. The gas production from the well that changes from time to time is also a disturbance to the plant. Because of some of these things, we need a method that can perform complex controls in solving this problem. The application of the Plant Wide Control method has been successfully carried out on the Gas Sweetening plant, which aims to maximize profit, maximize product rate and plant stability. By applying the PWC method to get a more optimal response when compared to the PID and FF control methods. With the results when the test increased setpoint 5% getting a settling time of 140s, a maximum overshoot of 0.14%, a steady state error of 4.52%, and an IAE value of 18965624.05. Meanwhile, during the 5% setpoint test, the settling time was 141s, the maximum overshoot was 1.64%, the steady state error was 4.37%, and the IAE value was 18974602. In terms of economic analysis, the use of PWC can increase profits by 652803.96 U$/h, or greater than 501.41 U$/h from PID and 125.07 U$/h from FF during the 5% setpoint increase test. And the profit is 597709,88 U$/h, or bigger 212.44 U$/h than PID and 154.9 U$/h from FF.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Gas Sweetening, Amine, CO2 dan H2S, Plant Wide Control
Subjects: T Technology > T Technology (General) > T57.62 Simulation
T Technology > T Technology (General) > T58.8 Productivity. Efficiency
T Technology > TJ Mechanical engineering and machinery > TJ222 Supervisory control systems.
T Technology > TJ Mechanical engineering and machinery > TJ223 PID controllers
T Technology > TN Mining engineering. Metallurgy > TN880.5 Natural gas pipelines
T Technology > TP Chemical technology > TP692.5 Oil and gasoline handling and storage
Divisions: Faculty of Industrial Technology and Systems Engineering (INDSYS) > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User: Ahmad Ufi Isbar
Date Deposited: 28 Aug 2021 01:53
Last Modified: 28 Aug 2021 01:53
URI: https://repository.its.ac.id/id/eprint/90473

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