Optimalisasi Konsumsi Fuel gas pada Boiler dengan Implementasi Sistem Kontrol Oxygen Excess Auto Cascade

Muhammad Taufik Hidayat; Bambang Irawan

Penulis

Muhammad Taufik Hidayat PT Badak NGL
Bambang Irawan PT Badak NGL

Abstrak

Boilers accounted for 99.8% of total energy consumption at Badak LNG refinery. Of this usage, 15.1% was lost through blowdown, flue gas, and other boiler inefficiencies. The combustion control system was redesigned using a cascade configuration between the excess-oxygen loop (AIC-1) and the air-flow control loop (FIC-1). Each loop was modeled to obtain transfer functions that were then used to simulate responses to possible input disturbances. The simulation results yielded PID parameters that guided on-site loop tuning. In addition, layered logic protection and new alarms were integrated into the control system. As a result, system reliability was validated under external extremes, including abrupt boiler load increases and decreases. The optimization reduced the fuel-to-steam ratio by 0.6 Nm³/ton with the average boiler load over the past year of 207.6 ton/h, this corresponded to a 0.72% reduction in fuel-gas consumption.

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Referensi

Y. A. Cengel and M. A. Boles, Thermodynamics: An Engineering Approach, 5th ed. New York, NY, USA: McGraw-Hill, 2006.

J. G. W. Cleaver and J. M. B. Evans, Boiler Efficiency and Combustion Control, 3rd ed. New York, NY, USA: Industrial Press, 2018.

A. K. Saha, R. K. Sinha, and S. Mukhopadhyay, “Optimization of oxygen excess in industrial boilers using advanced control strategies,” Energy, vol. 182, pp. 796–805, Sept. 2019.

K. Ogata, Modern Control Engineering, 5th ed. Upper Saddle River, NJ, USA: Prentice Hall, 2010.

R. C. Dorf and R. H. Bishop, Modern Control Systems, 13th ed., Boston, MA, USA: Pearson, 2017.

Y. Ito, PID Tuning Guidance for Yokogawa DCS (CENTUM VP), Tutorial Manual, Yokogawa Solution Service Corporation, Start-up Department, Aug. 12, 2015.

R. A. Nelson and J. C. Lipták, “Improving boiler efficiency via real-time flue gas oxygen trimming,” ISA Transactions, vol. 72, pp. 205–214, Mar. 2018.

J. F. Fulton, “Optimizing Combustion Control for Industrial Boilers Using Oxygen Trim Systems,” IEEE Transactions on Industry Applications, vol. 54, no. 3, pp. 3120–3128, May/June 2018.

M. Shinskey, Process Control Systems: Application, Design, and Tuning, 4th ed. New York, NY, USA: McGraw-Hill, 1996.

D. J. Cooper, Practical Process Control: Using LOOP-PRO Software, Control Station, Inc., Tolland, CT, USA, 2006.

A. Kumar and P. Singh, “Energy Efficiency Improvement in Steam Boilers through Advanced Control Strategies,” Applied Thermal Engineering, vol. 185, pp. 116–127, Feb. 2021