A mathematical model of the spouted bed gasifier has been constructed based on simplified first order reaction kinetics for the gasification reactions and the stream tube hydrodynamic model of Mathur and Lim. This two region model treats the spout as an isothermal plug flow reactor with cross flow into a series of streamtubes forming the annulus. Each streamtube is considered as a plug flow reactor. The effects of kinetic and hydrodynamic parameters on model predictions are illustrated, and a comparison made with experimental gas composition profiles obtained in a 0.30‐m dia. gasifier.
The Advanced Closed-Loop System ACLS is a regenerative life support system for closed habitats. With regenerative processes the ACLS covers the life support functions:(1) Removal of carbon dioxide from the spacecraft atmosphere via a regenerative adsorption/desorption process.(2) Supply of breathable oxygen via electrolysis of water,(3) Catalytic conversion of carbon dioxide with hydrogen to water and methane.
ACLS will be accommodated in a double ISPR Rack which will contain all main and support functions like power and data handling and process water management. It is foreseen to be installed onboard the International Space Station (ISS) in the Columbus Module. After an initial commissioning phase ACLS shall be operated as a supplement of the ISS Life SupportSubsystem thus enhancing its redundancy. Due to the regenerative processes applied in the ACLS it will allow a significant reduction of water upload to the ISS.
In 2011 the ACLS project was kicked-off by the European SpaceAgency under a commercial service procurement scheme. The project covers the design development & qualification of ACLS up to the completion of the ACLS flight model, its installation onboard the ISS in 2016 and its operation for life support service provision up to 2020. The paper summarizes the achieved development status. Nomenclature
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