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Institute
Biomass gasification is recognized as a viable avenue to accelerate the sustainable production of hydrogen. In this work, a numerical simulation model of air gasification of rice husks is developed using the Aspen Plus to investigate the feasibility of producing hydrogen-rich syngas. The model is experimentally validated with rice husk gasification results and other published studies. The influence of temperature and equivalence ratio on the syngas composition, H2 yield, LHVSyngas, H2/CO ratio, CGE, and PCG was studied. Furthermore, the synchronized effects of temperature and ER are studied using RSM to determine the operational point of maximizing H2 yield and PCG. The RSM analysis results show optimum performance at temperatures between 820 °C and 1090 °C and ER in the range of 0.06–0.10. The findings show that optimal operating conditions of the gasification system can be achieved at a more refined precision through simulations coupled with advanced optimization techniques.
SMath with Maxima
(2023)
Making and interpretation of drawings and schematics is an important skill to be developed in engineering education. The question type STACK in the Moodle learning management system combined with the interactive graphics library JSXGraph has a great potential for implementation of e-learning resources addressing these skills in formative and summative settings. The authoring process of such materials is complex due to multiple markup and programming languages like HTML, LaTeX, Maxima and JavaScript (JS) being involved. The Meclib concept mitigates this complexity and allows for efficient bulk production of material with consistent appearance and user experience. The core of Meclib is a set of pre-defined JSXGraph-based objects with an interface to Maxima, such that no problem specific JS code is required at all. The present paper outlines the basic ideas of the implementation and demonstrates the approach for some typical examples of different complexity. The focus is on applications in engineering mechanics, starting from static illustrations up to an editor for free body diagrams, with rich adaptive formative feedback.
Goal of the thesis is to research enhancement of the legislative robustness and its possibilities regarding nuclear security of mobile Small Modular Reactors (SMRs) in The Netherlands to improve the licensing process. SMRs are small Nuclear Power Plants (NPPs) with an electrical power output lower than 300 MWe with specific attributes like modularity and mobility, which is beneficial in serial manufacturing, like simplified design features, so fewer components allows for a higher reliability, like passive safety features, which connotes the behavior of components according to known laws of physics, for instance gravity, and like inherent safety features which are defined by reactor characteristics.
Chapter 2 reviews the inherent safety and security features of SMRs and its implications on nuclear safety and nuclear security. Chapter 3 deals with the international nuclear regulatory framework and its applicability towards licensing SMRs. Some IAEA Member States have revisioned their legal structure to optimize an SMR licensing process by applying a graded approach towards nuclear security and safety requirements. In Chapter 4 the Dutch nuclear regulatory framework and its impact on SMR developments related to nuclear safety and security are discussed. Suggestions and recommendations for possible legal adjustments are made. Chapter 5 approaches the harmonization of licensing requirements by proposing a more efficient alternative to the Dutch licensing process for all types of NPPs, including SMRs, as presented in international recommendations. Chapter 6 considers the need for SMRs and an alternative approach to the stakeholder involvement in the Dutch NPP licensing process.
Generally nuclear regulatory frameworks mainly focus on licensing conventional NPPs and the corresponding nuclear safety and security requirements and therefore prescribing overshooting regulations. Legal options to gradually approach safety and security requirements are deeply embedded in the Dutch Nuclear Energy Act and corresponding legislation. Combined with legal adjustments as denoted in the conclusions and recommendations, the adjustmenst are not only permittable and justifiable but also legally possible. Therefore, the licensing process of SMRs can be streamlined, establishing a harmonized and robust nuclear regulatory framework creating great opportunities for enriching the energy mix in The Netherlands with SMRs.
Competency Acquisition in Applied Knowledge Engineering An Approach based on Learning from Errors
(2018)