The newly developed Simetal Merim process from Siemens boasts an energy recovery level 20-30 percent higher than that achieved by conventional dedusting plants.
A Simetal Merim dedusting plant is now being installed for use with a new blast furnace at a facility operated by Turkish steel producer Kardemir. The Merim (Maximized Emission Reduction and energy recovery in IronMaking) process does not require water or sludge processing facilities, which frees up space and lowers the required investment. The new dedusting plant in Turkey is scheduled to go into operation in the second half of 2013.
The blast furnace process for manufacturing crude steel creates a very dusty exhaust gas (blast furnace gas), which can be used for energy recovery by having it drive a turbine. All dust must be removed from the gas beforehand, however; otherwise the turbine blades will be damaged. Furnace dust consists mainly of fine and coarse ore particles that can be recycled after being separated.
Wet-type dedusting techniques that produce wastewater and sludge as byproducts have commonly been used up until now. Another possibility is to employ dry-type dedusting units. Their dust filters are very temperature-sensitive, however, which is why the technique is not utilized very extensively.
The newly developed Merim dry-type dedusting method enables optimal purification of the exhaust gas prior to the energy recovery process, as well as efficient separation of the dust into useful and non-useful components. With the help of a two-stage dry-type dedusting process that includes an innovative centrifugal separator and fabric filters, the Merim system improves the energy recovery performance of furnace gas turbines by 20-30 percent.
Siemens' patented Advanced Temperature Control System solves the problem of fabric filter temperature sensitivity by continually maintaining a furnace gas temperature of between 80 and 250 degrees Celsius. This ensures the fabric filters are not damaged by excessively high temperatures, and that no deposits can build up through condensation at low temperatures. To this end, the blast furnace gas is either cooled by injecting water or heated using a burner.
Merim lowers the dust content in blast furnace gas to less than three milligrams per standard cubic meter and achieves a useful dust component separation efficiency of up to 90 percent. The plant in Kardemir is designed to be able to clean a maximum of 400,000 standard cubic meters of blast furnace gas per hour.
Dr. Norbert Aschenbrenner | Siemens InnovationNews
Filter may be a match for fracking water
26.09.2017 | Swansea University
Fraunhofer ISE Pushes World Record for Multicrystalline Silicon Solar Cells to 22.3 Percent
25.09.2017 | Fraunhofer-Institut für Solare Energiesysteme ISE
Controlling electronic current is essential to modern electronics, as data and signals are transferred by streams of electrons which are controlled at high speed. Demands on transmission speeds are also increasing as technology develops. Scientists from the Chair of Laser Physics and the Chair of Applied Physics at Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) have succeeded in switching on a current with a desired direction in graphene using a single laser pulse within a femtosecond ¬¬ – a femtosecond corresponds to the millionth part of a billionth of a second. This is more than a thousand times faster compared to the most efficient transistors today.
Graphene is up to the job
At the productronica trade fair in Munich this November, the Fraunhofer Institute for Laser Technology ILT will be presenting Laser-Based Tape-Automated Bonding, LaserTAB for short. The experts from Aachen will be demonstrating how new battery cells and power electronics can be micro-welded more efficiently and precisely than ever before thanks to new optics and robot support.
Fraunhofer ILT from Aachen relies on a clever combination of robotics and a laser scanner with new optics as well as process monitoring, which it has developed...
Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.
A warming planet
Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.
The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
19.09.2017 | Event News
12.09.2017 | Event News
06.09.2017 | Event News
26.09.2017 | Life Sciences
26.09.2017 | Physics and Astronomy
26.09.2017 | Information Technology