During transportation, there will be vaporization of LNG producing boil-off gas (BOG) and its re-liquefaction is required considering that large volume of BOG to be vented out. A cryogenic refrigeration cycle is utilized in order to re-liquefy the BOG and returns it to the cargo tank. Kapitza and claude are the usually used LNG re-liquefaction cycles. The developments in the processes adopted f...

The combined use of heuristics such as expert systems, databases, mathematical process simulators, equipment sizing and cost estimation is a potential way of exploring improved chemical process synthesis. We report on the development of a software that integrates knowledge based system with HYSYS process simulator and Icarus economic evaluator utilising knowledge from existing processes to obta...

Title of Document: Efficiency Enhancement for Natural Gas Liquefaction with CO2 Capture and Sequestration through Cycles Innovation and Process Optimization Abdullah Alabdulkarem, Doctor of Philosophy, 2014 Directed By: Professor, Reinhard Radermacher, Mechanical Engineering Liquefied natural gas (LNG) plants are energy intensive. As a result, the power plants operating these LNG plants emit hi...

The article presents results of thermodynamic analysis using a zero-dimensional mathematical models negative CO2 emission power plant. developed cycle plant allows the production electricity gasified sewage sludge as main fuel. can be achieved by use this type fuel which is already “zero-emissive” energy source. Together with carbon capture installation, there possibility to decrease below “zer...

and Scope of the Work The present work is part of a research project that is currently in progress at Tarragona with the main objective to develop an open and distributed architecture capable of supporting applications of collaborative intelligent techniques to control chemical processing plants. In this paper new ways to integrate external components with the HYSYS Process Simulator are explor...

in this paper, we are going to improve the energy efficiency of an industrial c 3 mr base load lng plant by changing its refrigerant components and its mole fractions in liquefaction and subcooling cycles based on the cooling curves generated in the main liquefaction and subcooling heat exchangers. later on, selection features of the elements will be discussed. first, non-optimized c 3 mr plant...

The article shows examples of the use Aspen Hysys software for optimization AVT-3 and AT-2 crude oil distillation units at Atyrau Oil Refinery. was implemented Refinery first time.Calculations were carried out to optimize refinery with construction a model in Hysys. As result calculations, possibility improving efficiency individual parts revealed, pilot runs on confirm. During run unit, restri...

Optimization of the whole plant instead of important individual units is essential for maximizing savings and operational efficiency. Often, there are conflicting objectives for optimizing industrial processes. Many previous studies on multi-objective optimization involved a few critical units (and not complete plants) using models and simulation programs specifically developed for the respecti...

This paper presents a study on the data-driven modelling and optimisation of a crude oil hydrotreating process using bootstrap aggregated neural networks. Hydrotreating (HDT) is a chemical process that can be widely used in crude oil refineries to remove undesirable impurities like sulphur, nitrogen, oxygen, metal and aromatic compounds. In order to enhance the operation efficiency of HDT proce...