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Frontiers in Energy

Front. Energy    2019, Vol. 13 Issue (2) : 317-324     https://doi.org/10.1007/s11708-019-0622-2
RESEARCH ARTICLE
Sensitivity analysis of using diethanolamine instead of methyldiethanolamine solution for GASCO’S Habshan acid gases removal plant
Samah Zaki NAJI1(), Ammar Ali ABD2
1. Chemical Engineering Department, Curtin University, Perth, Bentley, WA 6102, Australia; Petroleum Department Engineering, Kerbala University, Iraq
2. Chemical Engineering Department, Curtin University, Perth, Bentley, WA 6102, Australia; Water Resources Engineering College, Al-Qasim Green University, Iraq
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Abstract

Sweeting natural gas processes are mainly focused on removing carbon dioxide (CO2) and hydrogen sulfide (H2S). The high-energy requirements and operational limitations make amine absorption process sensitive to any change in conditions. This paper presented a steady-state simulation using Hysys to reasonably predict removal amounts of carbon dioxide and hydrogen sulfide from natural gas with the diethanolamine (DEA) solvent. The product specifications are taken from the real plant (GASCO’S Habshan) which uses the methyldiethanolamine (MDEA) solvent, while this simulation uses DEA under the same operation conditions. First, the simulation validation has been checked with the data of the real plant. The results show accurate prediction for CO2 slippage and accepted agreement for H2S content compared with the data of the plant. A parametric analysis has been performed to test all possible parameters that affect the performance of the acid gases removal plant. The effects of operational parameters are examined in terms of carbon dioxide and hydrogen sulfide contents in clean gas and reboiler duty.

Keywords acid gas      diethanolamine      methyldiethanolamine      carbon dioxide capturing      HYSYS simulation     
Corresponding Authors: Samah Zaki NAJI   
Online First Date: 29 April 2019    Issue Date: 04 July 2019
 Cite this article:   
Samah Zaki NAJI,Ammar Ali ABD. Sensitivity analysis of using diethanolamine instead of methyldiethanolamine solution for GASCO’S Habshan acid gases removal plant[J]. Front. Energy, 2019, 13(2): 317-324.
 URL:  
http://journal.hep.com.cn/fie/EN/10.1007/s11708-019-0622-2
http://journal.hep.com.cn/fie/EN/Y2019/V13/I2/317
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Samah Zaki NAJI
Ammar Ali ABD
Solvent MEA DGA DEA MDEA
Temperature/°C 32–140 32–140 32–135 30–140
Acid gas/amine 0.29–0.51 0.29–0.51 0.36–0.81 0.41–0.56
Solution conc./(mass%) 10–40 30–80 12–55 38–55
Capturing efficiency 90 85 80 Bulk removal only
Reaction heat for CO2/(kJ?kg–1) 1925 1730 1525 1400
Tab.1  Comparison of various alkanolamines solvent [68]
Fig.1  Process flow sketch of natural gas sweeting by absorption
Parameters Simulation data with DEA Plant data with MDEA
Feed gas temperature/°C 50 35–55
Feed gas pressure/kPa 6050 6050
CO2 content/(kmol?h–1) 1133 1133
H2S content/(kmol?h–1) 170 170.1
Acid gas pressure/bar 2.25 2.25
Acid gas temperature/°C 57 57
CO2 content/(kmol?h–1) 452.3 456.6
H2S content/(kmol?h–1) 145.3 169
Total flowrate/(kmol?h–1) 687 686.65
Sweet gas pressure/kPa 6650 6650
Sweet gas temperature/°C 57 57
CO2 content/(kmol?h–1) 666.101 675.8
H2S content/ppm 65.8 21
Total flowrate/(kmol?h–1) 29870 29835
Tab.2  Comparison of design results and real plant data
Fig.2  Sour feed gas against acid gas contents and reboiler
Fig.3  Lean amine temperature effect
Fig.4  Effect of absorber pressure
Fig.5  Plant capacity
Fig.6  Effect of diethanolamineconc
Fig.7  Regen temperature effect
Fig.8  Regen temperature with vapor percent of CO2 and total vapor
Fig.9  Adding/removing plates to absorber effect
Fig.10  Effect of adding/removing stages for regeneration column
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