Basic Concepts of Sterilization Techniques

Sterilization, which is any process, physical or chemical, that destroys all forms of life, it is used especially to destroy microorganisms, spores, and viruses. Precisely defined, sterilization is the complete destruction of all microorganisms by a suitable chemical agent or by heat, either wet steam. In this review, we discussed about various suitable techniques that used for removing of infectious agents. The heat sterilization can be applied only to the thermostable products, and chemical sterilization is also used for any types of plastic or glass materials that degrade with heat. The Gas sterilization involves exposing equipment to chemical gases in an enclosed heated or pressurized chamber.

A Numerical Analysis of the Influence of Nozzle Geometric Structure on Spontaneous Steam Condensation and Irreversibility in the Steam Ejector Nozzle

The spontaneous condensation of wet steam often occurs in the steam ejector nozzle, this deteriorates the performance of the steam ejector. In this paper, we take changing the geometric parameters of the nozzle as the focus of our research and construct an internal connection between steam’s condensation behavior and the nozzle’s throat radius, the nozzle’s divergent section expansion angle, and the nozzle’s divergent section length. Our numerical simulation results indicate that an increase in the throat diameter and reduction of the divergent section’s expansion angle can inhibit steam condensation behavior, to a certain extent. In particular, the steam condensation behavior will disappear at a 0° expansion angle, but it is not affected by the change in the divergent section’s length. In addition, the irreversibility that is seen under different changes to the nozzle’s structure parameters was investigated and the results show that the entropy generation that is caused by a phase change accounts for a much higher proportion of the total entropy generation than heat transport and viscous dissipation do. This indicates that steam’s condensation behavior makes a large amount of irreversible energy, resulting in energy waste and reducing the performance of the nozzle. Therefore, this study can provide a theoretical reference for suppressing the spontaneous condensation behavior of steam by changing the nozzle’s geometry.

Conceptual Design of Nuclear Wet Steam Turbines for Ease of Mass Manufacture

If the nuclear electricity generation is to play a significant role in the decarbonisation of the advanced economies in line with international commitments, construction rates will have to be achieved that are much greater than those achieved historically. This will require a root and branch reassessment of the nuclear technology base to maximise achievable industrial mobilisation. It is important to avoid ‘reactor chauvinism’ that might constrain us to technologies that whilst suited for regular times are un-suited to a challenge of this scale. A conceptual design for a CANDU reactor conventional island is proposed in this work. The design economises on components with laborious fabrication requirements, such as tubed heat exchangers, as well as leveraging developments in other sectors such as power electronics, and its potential performance is evaluated.