We research -
our customers benefit.
We conduct research in order to improve our products and solutions. This benefits our customers and our environment.
The results of our research should give us the ability to offer our customers the best, most effective and most energy-saving solutions.
The research project “Optimised water consumption in the separation of fine dust PM 2.5 with electrostatic influence on water dispersion systems” (abbreviated: OPTEB) is conducted in collaboration with the University of Wuppertal as a scientific partner under the patronage of the Federal Ministry of Education and Research.
The objective of the research is to achieve a better dust separation effect by electrostatically charging the spray mist and saving water in the process. On the basis of the research results, a unique water dispersion system should be developed that is suitable to effectively separate small dust particles in an effective and water-saving process without the need to use additives that could have a detrimental impact on the environment.
VSR Industrietechnik GmbH constructed a 20 m long wind tunnel for the project. A fan delivers a precisely measured dust-forming material flow to the tunnel, where multiple nozzles are installed for dust binding. The intensity of the dust-binding effect is determined with a laser aerosol spectrometer downstream from the nozzles. Testing is conducted with dust from different materials.
The following parameters can be varied during the testing:
- › Flow speed of the air
- › Material / bulk weight
- › Grain size
- › Dust quantity
- › Number
- › Design
- › Adjusted values: water and air quantity
- › Applied voltage
The results should give us the ability to offer our customers the best, most effective and most energy-saving solutions to their dust problems.
OpVib - investigation of modes of action and effectiveness of the process of vibration relief for metallic materials through a combination of experimentation and simulation.
The VSR process for reduction of internal stress has been known for a long time – its effectiveness is beyond doubt thanks to the positive experiences of many users.
However, the mechanisms that occur to reduce tension in components and workpieces have not been clearly quantified and the theoretical background has been discussed in literature for some time.
The objective of the research project was to provide clear evidence that internal stress is significantly reduced in a sample and later in a component with vibration treatment that is appropriate for the requirements.
The project was subsidised by the Federal Ministry for Economic Affairs and Energy (BMWi) in the framework of the Central Innovation Programme for Medium-Sized Businesses (ZIM).
Since the project could not be implemented with the originally chosen partners, subprojects were carried out with new partners:
- Simulation in collaboration with the Center for Wind Power Drives (CWD) of RWTH Aachen, by Prof. Jacobs, Dr. Schelenz and Dipl. Ing. Witter.
- Neutron beam examination on behalf of VSR by Dr. Hofmann of the Heinz Maier-Leibnitz Neutron Research Facility at the Technical University of Munich in Garching.
The desired evidence should be provided, wherein a simulation characteristic curve is determined and then the results are compared with those of the neutron beam examination in order to develop a method for computer-supported analysis of the optimised internal tension reduction of component with stress-reducing vibration, among other things.
The widely used construction steel S355 was chosen as the sample material for conditions that are as close to reality as possible. The creation and handling of the samples over the course of the project was very time-consuming, because any external influence would have changed the internal tension state.
Optimal positioning of the sample and the application of vibration were determined with the simulation model; the samples were assembled, radiated, vibration-treated and radiated again based on the specifications in Garching. The simulation calculation was being carried out at the same time in Aachen.
For investigation of the special samples that were welded to increase the potential internal tension, there was no evidence of major differences between tension states before and after the vibration treatment based on neutron beam measurement. The reason for this is assumed to be the interfering influence of natural relation over a comparably long time, which was necessary for the overall process of the testing in Duisburg, Berlin and Munich, as well as the external influences during the necessary transport.
On the other hand, the simulation based on actual boundary conditions (welding additive material and speed, material characteristics and the direction, amplitude and frequency of excitation) clearly demonstrated that undesired internal tension is reduced with a vibration treatment.
In the conclusive comparative study of a vibration-relieved sample and a low-tension annealed sample even showed that the internal tension would have been reduced more than annealing with the chosen material.
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