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ESCAPE28 Conference
Graz, Austria 10-13 Jun 2018

Abstract 369 - Applying new sustainability metric in different natural gas liquid (NGL) recovery configurations to extend investment decision and incorporate sustainability analysis in decision-making process.

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Presentation time: Tuesday 12, 17:30 to 18:15, in session Poster Session 2 - THEME 1, THEME 2, THEME 5.

Applying new sustainability metric in different natural gas liquid (NGL) recovery configurations to extend investment decision and incorporate sustainability analysis in decision-making process.

THEME 1: Model Development and Simulation

Topic 1.4 Environmental, social and risk models

Dr Saad Al-Sobhia*+
Mr Ahmed AlNoussb

a Qatar University
Chemical Engineering
POBOX 90178 Doha
Qatar

b Qatar University
Department of Chemical Engineering
Qatar

*: Corresponding author
+: Presenting author

Keywords: process simulation, Process Systems Engineering (PSE), Natural Gas Liquid (NGL), SWROIM, Decision-making

Sustainable design is considered as one of emerging research area in process system engineering (PSE) society. It extends the investment decision that focus mainly on profitability analysis to consider other aspects such as the environmental impact. In this work, the sustainability dimensions such as the economic and environmental impact are considered to assess the natural gas liquids (NGL) recovery process using a new sustainability metric referred as the sustainability weighted return on investment metric (SWROIM) introduced recently by El-Halwagi 2017. It extends return on investment (ROI) concept and makes use of the augmented sustainability metrics and process integration targeting (benchmarking) approaches to be utilized. In this work, we proposed a sequential overall energy savings and emission reduction strategy. Firstly, we used ASPEN HYSYS V9 to simulate different NGL flowsheet configurations. The turbo-expanding separation method, the most applicable separation technology in today’s gas industry is considered to process 84000 kg/h of natural gas. ASPEN HYSYS, a powerful simulation package, is used to estimate the material balance and energy balances of different NGL flowsheet and helped us to address what-if analysis and carry out sensitivity analysis. The other simulator components such as ASPEN Energy Analyzer were utilized to perform other energy saving activities. to improve the design of baes case. Considering the economic evaluation first, and using the simple payback analysis, GSP and IPSI-1 are competing in comparison with the original ISS configuration with 0.34 and 0.36 as estimated payback time is years, respectively. However, CRR has the lowest annual carbon emission of approximately 2000 kg/hr with a potential target of 974 kg/hr. Although, IPSI-2 has initially 4000 kg/hr as annual CO2 emission, there is a potential to be reduced to 260 kg/hr, a better target than CRR. Furthermore, this work can be considered as the basis for future works such as Mutli-objective optimization.

References

  1. El-Halwagi, M. M., A return of investment metric for incorporating sustainability in process integration and improvement projects, Clean Technologies and Environment policy, 2017a,19, 611-617.

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