We are delighted to present our Virtual Programme to you.
Please note this is subject to change. Information is being added regularly so do come back!
19 November 2020
11:30 - 13:30 GMT
"AGM & Technical Meeting"
An industrial and experimental case studies on hydrate prediction and inhibition
Speaker: Dr Nejat Rahmanian
Authors: Nejat Rahmanian a*, Nejmi Söyler,a,b Farai Munashe Wandea , Bahman Tohidic
a Department of Chemical Engieering, Faculty of Engineering and Informatics, University of Bradford, BD7 1DP, UK
b Department of Chemical Engineering, Ondokuz Mayıs University, 55139 Samsun, Turkey
c School of Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, Edinburgh, UK
Formation of natural gas hydrates can cause serious problems during drilling and production operations in the oil and gas industry. This investigation reports the first study to predict hydrate formation using Aspen HYSYS® and HydraFlash softwares for various gas compositions and thermodynamic inhibitors (MEG concentrations at 10, 20, 30 and 40 𝑤𝑡% and Methanol concentrations at 10 and 20 𝑤𝑡%). Aspen HYSYS® is widely used in the petroleum process system containing thermodynamic inhibitor for this crucial purpose on prediction of solid phase behaviour. The simulated predictions are compared with results of available industrial and experimental data in the literature. It has been shown that HydraFlash software can accurately predict hydrate formation condition for a given industrial case, without having to carry out costly experimental work. This work also looked the effect of inhibitors and it appears that inhibitor type and concentration are determined according to condition of gas composition. MEG is consequently selected as the most ideal hydrate inhibitor for the industrial case. The hydrate formation prediction was carried out by HydraFlash for a high concentration of MEG inhibition at 40 𝑤𝑡% is up to 313 K with a pressure of 3111 𝑏𝑎𝑟. Finally, it is shown that both software packages are quite accurate and useful tools for prediction of hydrate for simple systems. However, HydraFlash can simulate more complex systems, including 13 different types of salts, while so Aspen Hysys covers sodium hydroxide as the common salt.
Turbomachinery Configuration for LNG Projects - Conceptual Selection
Speaker: Mounir MOSSOLLY
Refrigerant compressors are the pumping heart of any liquefied natural gas plant. Those compressors are centrifugal type, they vary in size and configuration, being influenced by the context of the project. Steam turbines, gas turbines (heavy duty or aero-derivative) and/or electric motors are all possible options to drive the refrigerant compressors. A single shaftline could couple one, two or three compressor casings depending on the liquefaction process technology and process balancing needs, and also linked to the output power(s) of the possible drivers options. This paper will technically elaborate on how decisions are technically made for selecting the optimum turbomachinery configuration of refrigerant compressors in LNG plants. The paper will list the various criteria that could be initially set (and given an importance weight), which shall be used as a basis for evaluation and decision making. Technical constraints that could be faced will also be discussed. This paper builds on technical experience attained through working on several conceptual and pre-FEED studies for turbomachinery selection in LNG projects.