EXPERIMENTAL STUDIES OF SOLUBILITY OF ELEMENTAL SULPHUR IN SUPERCRITICAL CARBON DIOXIDE BETWEEN 10 AND 40 MPA

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Experimental Studies of solubility of Elemental Sulphur in Supercritical Nitrogen

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Experimental study of solubility of elemental sulphur in methane

International audienceThe chemical engineering department of LaTEP has been working for many years on theproblem of sulphur deposition especially in natural gas network [1, 2]. The solid sulphurappears immediately downstream of a pressure reduction facility. One of the hypothesesproposed to explain the solid formation, based on a thermodynamic approach, is thedesublimation of sulphur. During gas expansion, both pressure and temperature decrease.Consequently the gas may become over saturated in sulphur. Because we are below thetemperature of sulphur triple point, part of the gaseous sulphur can be transformed into solidparticles. Thus, it is important to obtain solubility data of sulphur in natural gases. Methane isthe major natural gas component. So, it is of importance to measure solubility of elementalsulphur in CH4. In this paper experimental measurements up to a pressure and temperature of30 MPA and 363.15 K are presented.The principle of the experimental pilot can be resumed following three steps: saturationof the gas with sulphur, trap of all the dissolved gaseous sulphur and finally quantification.Although the principle is simple, experimental difficulties occur at the three steps. A variablevolume equilibrium cell is used to saturate the gas with sulphur. Since sulphur solubility valueis weak in gas transport conditions, the volume of the cell is necessarily big (0.5 Litre). Thepressure of the equilibrium cell is held constant thanks to a piston during the trapping step. Anoriginal gaseous sulphur trapping method was developed. It is based on the reactiveabsorption of the gaseous sulphur with solvent. Indeed, the gas bubbles into a liquid solutionwhich traps gaseous sulphur. Finally, the solution which contains a standard is analysed bygas chromatography and sulphur is quantified. The total volume of the gas withdrawn isdetermined by a position transducer placed on the autoclave. Then, the sulphur solubilityvalue is calculated

Rigorous modelling of multicomponent mass transfer in reactive absorption

International audienceIn the last years, many works on the modelling of multicomponent reactive separation using the Maxwell-Stefan relations have been published. However, most of them use a bootstrap equation and need a film thickness. Thus, we have developed a general model of multicomponent mass transfer in reactive absorption for ionic system using continuum mechanics to describe the local phenomena in each phase. This description is based on the works of Truesdell [1] and Slattery [2]. It does not require any mass transfer coefficient or film thickness. Model description Using the transport theorem, the balances of each conservative quantity could be written as an equation of conservation applied to each point of the continua. In order to describe the evolution of the nc various components we require to solve the conservation of mass for species {

S8: Logiciel de calcul de détermination de la présence de dépôts au sein du réseau de transport européen de gaz naturel (manuels d’utilisation, de formation et de présentation de formation également fournis).

Logiciel de calcul de détermination de la présence de dépôts au sein du réseau de transport européen de gaz naturel (manuels d’utilisation, de formation et de présentation de formation également fournis).International audienc

Stockage thermique adapté à la serriculture Nordique : retours d’expérience

International audienceThe Inuit of the Canadian North live in isolated territories where there are no land routes. As a result, for the past few decades, they have been facing major adaptation challenges, particularly in terms of food and access to energy. Since June 2016, our research focuses on the potential of greenhouse farming in circumpolar territories with the case study of the cooperative greenhouse of Kuujjuaq (largest village in Nunavik in terms of population - 2375 inhabitants in 2011, latitude 58° north and longitude 68° west). Measurements in this greenhouse revealed a major problem: a temperature difference between day and night that was too large, hindering the development of crops. To address this, a thermal storage system was installed in October 2018. It is based on a rock bed of known porosity, positioned under the crop land, in which a heat transfer fluid that circulates, will allow the daily heat surplus to be stored during period with temperature peak, in order to reheat the greenhouse when the temperature in low, especially in the nighttime. The poster will focus on the performance of the system after two years of operation.Les Inuits du Nord canadien vivent sur des territoires isolés où aucune route terrestre ne permet de se rendre. De ce fait, depuis les dernières décennies ils affrontent de grands défis d’adaptation, notamment sur le plan de l’alimentation et de l'accès à l'énergie. Notre recherche s’intéresse depuis juin 2016 aux potentiels de la serriculture dans les territoires circumpolaires, avec comme cas d’étude la serre coopérative de Kuujjuaq (plus grand village du Nunavik en termes de population – 2375 habitants en 2011, latitude 58° nord et longitude 68° ouest). L’instrumentation de cette serre a permis de mettre en évidence une problématique majeure : un écart de température entre le jour et la nuit trop important, gênant le développement des cultures. Pour y répondre, un système de stockage de chaleur a été mis en place en octobre 2018. Il est basé sur un lit de roche de porosité connue, positionné sous la terre de culture, parcouru par un flux d’air servant de fluide caloporteur. Ce dispositif permet de stocker le surplus de chaleur journalier afin de combler le déficit nocturne. Le poster se focalisera sur les performances du système après deux années de fonctionnement