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Innovative high thickness cutting technique with new filtration systems.

G. Pilot, J.P Grandjean, H. Gräber, J. Grimaldi, EURADWASTE'99, 15-18 novembre 1999, Luxembourg.

Document type > *Congrès/colloque

Keywords > ventilation and filtering, decommissioning, filtration

Research Unit > IRSN/DSU/SERAC

Authors > [et al.], PILOT Guy

Publication Date > 15/11/1999

Summary

The LSI (from the german words: Lichtbogen - Sauerstoff - Impulsschneiden) is an innovative thermal cutting technique. It involves the ignition of an oscillatory voltaic arc between a continuous-fed consumable electrode and the workpiece. The basic material is first locally heated to ignition temperature by the voltaic arc, then burnt due to the simultaneously exiting oxygen jet that is coaxially supplied at high speed and then blown out of the kerf The total sum of thermal energies allows the cutting of various metals and their respective alloys. This tool was tested in a 32 m3 cutting cell equipped with an exhaust system and numerous measurement devices. With a 1.6 mm diameter wire, the cutting of 100 mm thickness stainless steel plates and 200 mm thickness mild steel plates was possible. With a 2.4 mm diameter wire, the cutting of 250 mm thickness mild steel plates was possible. The cutting speed was faster for mild steel than for stainless steel plates (respectively 10 c d m i n and 3 cdmin for example in the case of 100 mm thickness plates). This tool produces a lot of fumes and it is necessary to use an adequate filtration system for managing these fumes. Two innovative filtration systems have been developed: B an electrostatic filter with acoustic declogging, B a pleated stainless steel cartridge with pneumatic declogging. These systems have been tested in different configurations in order to restore the filtration efficiency (electrostatic filter) or to restore the pressure drop (stainless steel cartridge) and have been satisfactory.
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