Travail de fin d'études et stage[BR]- Travail de fin d'études : Compressor-turbine unit for CO2 separation by membranes: operating points for ideal energy integration.[BR]- Stage

Abstract

This master’s thesis focuses on the development and optimisation of a post-combustion CO2 capture plant utilising membrane separation. The primary goal is to design a configuration that meets operational requirements while minimising power consumption and equipment costs. Ensuring system durability by minimising condensation within critical components, including an atom-thick membrane, is also a key objective. This involves the conception of a cooling and drying unit to remove humidity from the flue gases. Additionally, the thesis addresses the preliminary design of the compressor-turbine unit (CTU), incorporating small-scale turbomachinery and gas-lubricated bearings. The initial design phase consists in simulating multiple configurations using Aspen Plus, which enables quick evaluations and the elimination of non-feasible options. However, Aspen has some limitations in optimizing complex systems, which are overcome by using a custom- coded Matlab model, offering greater flexibility and control over key parameters. The thesis ultimately compares different feasible configurations and determines the Pareto front of one process layout depending on several design parameters. The conclusion emphasises the need for further refinement of the models and accurate equip- ment sizing. A detailed analysis of capital and operational expenses associated with addi- tional plant equipment is also recommended to identify the most cost-effective solution.