The Vertical Leaching Migration Research on 137Cs in Soil Around Shidaowan Plant of CAP1400

The risk of radioactive material leakage caused by nuclear accidents increased with the increasing of number of Nuclear Power Plants in China. One of the serious threat of radiation harm to the human body is believed to be 137Cs. It can exist in the environment for a long time, due to the half-life of which is as long as about 30 years. In this research, the brown soil and aeolian sandy soil were selected as two kinds of classic soil around the site of Shidaowan demonstration plant of CAP1400 to carry out the 137Cs migration model experiments. The source of radioactivity was put on the 16 of experiment columns that were filled by undisturbed soil, the simulated raining weather was according to the local rainfall amount with two sprinklers, and the sunlight was replaced by fluorescent lamp. The result showed that the vertical migration model of radionuclides in soil is one-dimensional convective dispersion equation. three-year experiments showed that most of 137Cs in soil were distributed in the range of 0–4cm. The simulation results using the Hydrus 1D with 10 years that most of 137Cs in soil were distributed in the range of 0–10cm, so the nuclear accident caused by the serious nuclides have little impact on groundwater.

Container-Sized CO2 to Methane: Design, Construction and Catalytic Tests Using Raw Biogas to Biomethane

Direct catalytic methanation of CO2 (from CO2/CH4 biogas mixture) to produce biomethane was conducted in a pilot demonstration plant. In the demonstration project (MeGa-StoRE), a biogas desulfurization process and thermochemical methanation of biogas using hydrogen produced by water electrolysis were carried out at a fully operational biogas plant in Denmark. The main objective of this part of the project was to design and develop a reactor system for catalytic conversion of CO2 in biogas to methane and feed biomethane directly to the existing natural gas grid. A process was developed in a portable container with a 10 Nm3/h of biogas conversion capacity. A test campaign was run at a biogas plant for more than 6 months, and long-time operation revealed a stable steady-state conversion of more than 90% CO2 conversion to methane. A detailed catalytic study was performed to investigate the high activity and stability of the applied catalyst.

Entwicklung energieflexibler Anlagen/Development of energy-flexible machinery.

Mit der Energiewende geht durch Wind- und Photovoltaikanlagen eine erhöhte Volatilität in der Stromerzeugung einher. Daher müssen industrielle Fertigungsanlagen zunehmend in der Lage sein, energieflexibel zu arbeiten. Dies verbessert einerseits die Netzstabilität und bietet andererseits Unternehmen die Möglichkeit, Energiekosten einzusparen. In diesem Beitrag wird anhand einer Entwicklung einer energieflexiblen Demonstrationsanlage, aufzeigt, wie Energieflexibilitätsmaßnahmen auf der Fertigungsebene um- und eingesetzt werden können.   Wind energy and photovoltaic systems are accompanied by increased volatility in power generation due to the energy transition. To counteract the volatile generation, industrial production plants need to raise their ability to operate energy flexible. This improves grid stability and leads to cost savings for companies. In this paper it is shown how measures for energy flexibility can be successfully implemented and applied on the shop floor level. This is done by the development of an energy flexible demonstration plant.