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Study of innovative cryogenic plants for efficient LH2 liquefaction & fusion reactors refrigeration H/F


Détail de l'offre

Informations générales

Entité de rattachement

Le Commissariat à l'énergie atomique et aux énergies alternatives (CEA) est un organisme public de recherche.

Acteur majeur de la recherche, du développement et de l'innovation, le CEA intervient dans le cadre de ses quatre missions :
. la défense et la sécurité
. l'énergie nucléaire (fission et fusion)
. la recherche technologique pour l'industrie
. la recherche fondamentale (sciences de la matière et sciences de la vie).

Avec ses 16000 salariés -techniciens, ingénieurs, chercheurs, et personnel en soutien à la recherche- le CEA participe à de nombreux projets de collaboration aux côtés de ses partenaires académiques et industriels.  

Référence

2022-24963  

Description de l'unité

Les activités du Département des Systèmes Basses Températures (DSBT) s'articulent principalement autour de trois piliers : la grande réfrigération et la thermohydraulique ; les combustibles et cibles pour la fusion et les lasers ; les cryoréfrigérateurs et la cryogénie spatiale. L‘objectif principal du département est le développement, dans le domaine des très basses températures, de solutions innovantes et adaptées à des demandes complexes. Une des spécificités du DSBT est sa capacité à mener un projet de sa phase de recherche de base (TRL0) jusqu'à sa réalisation finale à des niveaux élevés de maturité technologique (TRL9).

Description du poste

Domaine

Thermohydraulique et mécanique des fluides

Contrat

Stage

Intitulé de l'offre

Study of innovative cryogenic plants for efficient LH2 liquefaction & fusion reactors refrigeration H/F

Sujet de stage

The goal of the activity is to contribute to the development of the DSBT in-house numerical tools for steady and unsteady modelling of cryogenic systems focused on the efficient LH2 liquefaction systems, boil-off gas recovery architecture and the refrigeration of large HTS systems at intermediate temperatures. Such updates and improvements will be applied to carry out simulations of liquefaction system architectures. The results will also be used to assess the feasibility of the architectures and the availability of critical sub-systems. Sensitivity simulations on the boundary conditions and the main driving parameters of the cryogenic plant will also be performed.
The activity will be divided in several phases:
• Phase 1: Bibliographic review and numerical modelling update.
• Phase 2: Modelling of existing cryo-plant.
• Phase 3: Development of alternative cycles.
• Phase 4: Synthesis.

Durée du contrat (en mois)

6 mois

Description de l'offre

The sprawling development of cryogenic liquid hydrogen (LH2) mobility solutions for land [R1], sea [R2] and air [R3] applications as a way to reduce the carbon emissions and its global warming effect is a new technical and scientific trend rich of challenges and opportunities for innovation. Certainly, the widespread use of LH2 in such massive scale and tonnage as forecasted in [R4] will be affected by the energy and production efficiency of the H2 liquefaction and storage system up to the delivery to the end-user. The assessment of the efficiency of these processes is fundamental since it must be included in the global energy balance evaluation of the H2-based economy.

In recent years a number of academic publications have been devoted to the development of alternative and more efficient (in terms of specific energy consumption SEC in kWh/kg) thermodynamic cycles for the liquefaction of hydrogen based on larger plants [R5], complex precooling architectures with mixed refrigerants and low temperature cooling systems with high performance compressor and expansion turbines [R6]. While these solutions are aimed at reducing the current 12 – 15 kWh/kg efficiency down to ~6 kWh/kg the cost assessment as long the analysis of the state of the art of the hardware require further analysis especially for larger plants.

Another topic of interest is the close coupling of the liquefaction system to its environment: to the intrinsically intermittent renewable power sources which requires potentially the dynamic control of the operating modes to the recovery of boil-off vapour. The evaluation of the transient behaviour of the liquefaction system is necessary to verify the operability of the plant and its effectiveness.

Profil du candidat

Candidate required competences: Curiosity and autonomy. Fluids mechanics and thermodynamics. Numerical modelling & Matlab™/ Simulink/Simscape. Knowledge of cryogenic processes will be an added value.

A BAC+5 internship if foreseen with a duration of 6 months.

 

In accordance with the commitments made by the CEA in favor of the integration of people with disabilities, this application is open to all.

Localisation du poste

Site

Grenoble

Localisation du poste

France, Auvergne-Rhône-Alpes, Isère (38)

Ville

Grenoble

Demandeur

Disponibilité du poste

01/02/2023