Objective
To make it possible to significantly reduce dust pollution in mechanised, advanced workings in steep-dipping seams, while maintaining conditions for personnel transport and material transportation.
The idea was to design a reliable and safe secondary ventilation exhausting system consisting of:
- an exhausting ventilation column located in the site and made of light materials so as to facilitate handling, being smooth to avoid build-ups of dust and approved for use underground.
- a fan with dust-extractor device in the primary ventilation system, the dust-extracting function being necessary to prevent the dust from being reintroduced into the main ventilation circuit.
The tests carried out on the complete dust-extraction system provide the following results:
- The complete dust-extraction system achieves the anticipated aeraulic performance (ie. 13.1 m{3}/s and 403 mm CE) and makes it possible to maintain an underground airflow of 10 m{3}/s with a maximum line extension of 700 m.
- The dust treatment is effective. In fact, in all cases the overall effective values exceeded 99%, and those for dusts liable to be inhaled are broadly better than 93% for a concentration of 2000 mg/m{3}, thus complying with the specification.
- In addition, filter clogging is reduced and self-cleaning seems to take place in a satisfactory manner.
- The average level of acoustic pressure at the intake louvre, with the soundproofing cover removed, is 101 dBA. The figure for points at a distance of 1 m from the outer edges is 93 dBA. These values may be reduced by approximately 3 dBA with the soundproofing covers in place.
As the complete dust-extraction system maintained the required aeraulic performance right through to the completion of cutting in the gateroad, the dust treatment system proved its effectiveness, even with regard to time-related developments, and with the build-up of dust in the conduits at the end of the advanced workings being relatively insignificant, we are in a position to report that the research has satisfied all of the requirements originally stipulated.
Research Programme
- to define and design an exhausting ventilation system with rigid, light and smooth conduits, with the fan and dust-extraction device located within the main ventilation system
- to design and implement measures or control and monitoring procedures ensuring the proper functioning of the installation as part of the firedamp prevention regime for the site
- to decide on the measures required to avoid or neutralise any build-ups of dust in the ventilation column.
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Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding Scheme
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Coordinator
57802 Freyming Merlebach
France
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.