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Steel slag carbonation in a flow-through reactor system:The role of fluid-flux

Journal of Environmental Sciences 2015年第1期27卷 266-275页

作者： Eleanor J.Berryman Anthony E.Williams-Jones artashes a.migdisov Department of Earth and Planetary Sciences McGill University Technische Universitat Berlin Los Alamos National Laboratory

Steel production is currently the largest industrial source of atmospheric CO2. As annual steel production continues to grow, the need for effective methods of reducing its carbon footprint increases correspondingly. The carbonation of the calcium-bearing phases in steel slag generated during basic oxygen furnace（BOF） steel production, in particular its major constituent, larnite {Ca2SiO4}, which is a structural analogue of olivine {（MgFe）2SiO4}, the main mineral subjected to natural carbonation in peridotites, offers the potential to offset some of these emissions. However, the controls on the nature and efficiency of steel slag carbonation are yet to be completely understood. Experiments were conducted exposing steel slag grains to a CO2–H2O mixture in both batch and flow-through reactors to investigate the impact of temperature, fluid flux, and reaction gradient on the dissolution and carbonation of steel slag. The results of these experiments show that dissolution and carbonation of BOF steel slag are more efficient in a flow-through reactor than in the batch reactors used in most previous studies. Moreover, they show that fluid flux needs to be optimized in addition to grain size, pressure, and temperature, in order to maximize the efficiency of carbonation. Based on these results, a two-stage reactor consisting of a high and a low fluid-flux chamber is proposed for CO2 sequestration by steel slag carbonation,allowing dissolution of the slag and precipitation of calcium carbonate to occur within a single flow-through system.

关键词： CO2sequestration Steel slag carbonation Flow-through reactor Fluid flux

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A New Approach in Hail Prevention Technique for a Locally Restricted Area

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Agricultural Sciences 2017年第7期8卷 559-571页

作者： artashes K. Arakelyan ECOSERV Remote Observation Centre Co. Ltd. Yerevan Armenia

This article describes a new method for hail detection and an autonomous and automatically functioning complex for hail prevention, suppression or trapping for locally restricted application.

关键词： Hail Hail Detection Hail Prevention and Suppression Brightness Temperature Microwave Radiometer

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Hail Detector and Forecaster ArtAr-HDF

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Agricultural Sciences 2020年第11期11卷 966-982页

作者： artashes K. Arakelyan Vanik V. Karyan Maria K. Arakelyan ECOSERV Remote Observation Centre Co. Ltd. Yerevan Armenia

This article describes a new and low-cost microwave passive sensor for hail prediction (forecasting) and detection developed in Armenia, which can be used to implement fully autonomous and automatically functioning hail protection of locally limited or large agricultural and urban areas in order to prevent, suppress or catch hail in traps. The article also presents the results of measurements of the intrinsic emission characteristics of water and ice, rain and hail clouds, carried out in laboratory and field conditions in the Ku-band of radio frequencies. The results obtained showed that the intrinsic emission of a hail cloud in the Ku-band of radio frequencies differs significantly from the intrinsic emission of a rain cloud. The presented results show that indeed the radar is not very suitable for the timely detection and determination of hail with a high probability, which is very important for the timely starting up of anti-hail protection means. On the contrary, radiometers (passive microwave sensors) can become an effective sensing tool for timely detection and recognition of hail with a high probability of long-range approaches up to ~12 - 15 km.

关键词： Hail Hail Detection Hail Forecasting Hail Prevention and Suppression Hail Trapping Brightness Temperature Microwave Radiometer

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