Perancangan dan Simulasi Sistem Antisurge Control pada Wet Gas Compressor pada PT Kilang Pertamina Internasional RU IV Cilacap
ROSYAD FATHUR SAIFUDDIN, Prof. Dr. Jazi Eko Istiyanto, M.Sc.
2024 | Skripsi | ELEKTRONIKA DAN INSTRUMENTASI
Compressors play an important role in various industries, including the oil and gas industry. Compressors function to increase the pressure of compressed fluids such as gas. One type that is often used is the centrifugal compressor. However, centrifugal compressors are prone to the surge phenomenon, which can damage the compressor. Surge occurs due to instability in flow and pressure, causing vibrations and the potential for automatic shutdown. To prevent surge, an antisurge control (ASC) system is used, which monitors parameters such as flow, pressure, and temperature. ASC works by adjusting the antisurge valve to maintain the stability of the compressor's operation. This study aims to design and simulate ASC using Aspen HYSYS software to protect the compressor from the surge phenomenon.
The ASC system was successfully simulated using Aspen HYSYS software, and a PI controller was used to keep the compressor's operating point safe. PI tuning was done using the Ziegler-Nichols open-loop method. The surge controller parameters were automatically obtained in Aspen HYSYS. The PI controller was able to maintain the stability of the compressor's operation, while the PID controller tended to be more sensitive and unstable. When disturbances were applied in the form of reduced molar flow, temperature, and pressure, ASC was able to keep the operating point from reaching the surge line by opening the antisurge valve, ensuring the compressor's operation remained safe.
Kata Kunci : Antisurge control, Surge, Kompresor sentrifugal, Aspen HYSYS