The present paper analyzes the energy dynamics of process networks and/or staged processes whereby the material recycle streams interconnecting the units/stages take on the additional role of energy carriers. In the presence of large energy input and output flows, the networks considered are shown to exhibit a dynamic behavior with multiple time scales, with the variables in the energy balance ...

The problem of recovering ethylene and byproducts from the steam pyrolysis of light hydrocarbons is discussed. Opportunities for improved efficiency using distributed distillation, recycle coupling, heat pumping, and mixed refrigeration are presented. Emphasis is placed upon energy efficiency with potential savings in capital costs as applied to refrigerated processes.

The problem of separating the liquid components which have been recovered from natural gas is discussed. Opportunities for improved efficiency using distributed distillation, recycle coupling, heat pumping, and partial effect distillation are presented. Emphasis is placed upon energy efficiency with potential savings in capital costs as applied to heat driven processes.

Natural gas produced at high pressure (50-70 bar) is the only industrial source of helium (He). A membrane separation process may offer a more efficient production system with smaller footprint and lower operational cost than conventional cryogenic system. Inorganic membranes with high mechanical strength are known to exhibit good stability at high pressure. In this work, two inorganic membrane...

Supercritical fluid technology is a new technology being extensively studied in the past two decades. The research on application of supercritical fluid to PCB recycling is an attempt to equip the recycling industry with the state-of-the-art technique to achieve better economic benefits and environmental objectives. Through the exploratory research and the systematic study, it is proved that th...

Recycling is generally thought of as an attempt to close a material loop with an additional input of energy. That is, by nature’s own model, discarded mixed materials are restored to their original pure condition for re-use. Economically minded people recycle when the value of the reclaimed materials exceeds the cost to capture and restore them. Ecologically minded people recycle to conserve re...

Along with the spreading application of wireless sensor network, once the node energy is exhausted, it will cause environmental pollution. Therefore, the problem of node recovery becomes increasingly important. The automatic recycling of robot will become one of the feasible methods. The key is how to use less time and energy consumption to recycle all nodes as well as prolong the lifespan of w...

Abstract A novel method of modeling centrifugal compression systems for surge control purposes by using bond graphs is presented. By using the bond graph method, we get a simple description of compression systems based on physical phenomena and it is straight forward to get the dynamic equations. It is demonstrated that several active surge control methods can be represented by the same bond gr...