Abstract
Ethylene yield is significant in showing the performance of the steam cracker furnace in the olefin plant. This study was conducted in the actual large-scale olefin plant to see the impact of various variables towards the ethylene yield. The analysis was conducted utilizing Regression Analysis in Minitab Software Version 18 to develop a reliable ethylene yield model. The model concluded that ethylene yield in the studied plant was contributed by the factor of -0.000901, 0.02649, -0.282, 0.16, -0.0834, 0.1268, and 0.0057 of Hearth Burner Flow, Integral Burner Flow, Steam Drum Pressure, Super High-Pressure Steam (SHP) Boiler Feed Water Flow, SHP Flow, Naphtha Feed Flow, and Stack NOx Emission respectively. The Response Optimizer tool also showed that the ethylene yield from naphtha liquid feed utilizing pyrolysis cracking can be maximized at 32.55% with control setting at 9,476.41 kg/hr of Hearth Burner Flow, 608.56 kg/hr of Integral Burner Flow, 112.93 Barg of Steam Drum Pressure, 109.11 t/hr of SHP Boiler Feed Water Flow, 86.42 t/hr of SHP Flow, 63.49 t/hr of Naphtha Feed Flow and 126.23 mg/m3 of Stack NOx Emission.
Highlights
The study was conducted in a newly commissioned olefin plant with naphtha liquid as a feedstock to the steam cracker furnace
Short Residence Time (SRT) VII furnace and its auxiliaries in the studied plant including Burners, Steam Drum, Induced Draft Fan (IDF), and Transfer Line Exchanger (TLE) were utilized for the study
These repetitive steps were conducted to ensure a reliable mathematical model being developed for Ethylene Yield represented by Y1
Summary
The study was conducted in a newly commissioned olefin plant with naphtha liquid as a feedstock to the steam cracker furnace. The plant was designed to produce 1,100 KTA capacity of polymer grade ethylene product via pyrolysis cracking in the large-scale steam cracker furnace. Conducting the study in actual plant conditions is challenging as it is often affected by process fluctuation [1, 2] due to frequent variation in the upstream process, downstream readiness, utility availability, and feedstock composition. Ethylene production from thermal cracking in the Short Residence Time (SRT) VII furnace is among the most promising technology available in the market [10, 11] due to its promising olefin yields and sustainable technology
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