H4-DV-26-D g flange short spacer Housing flange long mou Helical gear reducer H4

Flender/Flender Gear Units/Helical gear reducer H4

ing operated with the control system developed for adjusting the extractor capacity. 3% reduction in diffuse emissions was determined in comparison with the reference area. The project goals were thus achieved. Dilution of the exhaust gases was successfully prevent- ed. This improvement was achieved by temporarily making throttled extractor capacity available to certain electrolysis cells undergoing an emission-intensive phase due to the respective proc- ess. This was made possible by the process control equipment exploiting de ree of freedom in order to suppress feedback effects on the cells on collecting manifold fofowing multiple increases in extractor capacity. Finally, comparison ofthisworkwiththepresentationsfromtheliteratureis intendedtoshow the problems of the feasible improvement as regards diffuse emission. In the graph below, the HAW characteristic curve ( is compared with other, similar cell coverings ()and () of differ- ent types. The straight line () is an ex erimentally determined limiting value which was meas- ured with hermetic sealing of the si& covering; this was presented in the same work. The HAW straight line ( presents the general degree of collection for closed cell in normal conditions, determined at 7 m3/min. The comparison shows that the slope of the functions on1 corresponds over small range; coverings ,, and ,, display pronounced de ression of tKe degree of collection after just slight reduction in the quantity extracted; thesequnctions suggest that an even lowervalue can be expected for the normal quantity of 7 m3/min. extracted at HAW, .. the HAW electrolysis cells already had comparatively good coverings at the start of this project; design measures for reducing diffuse emissions were already extensively utilised. 1 ~ ~ -___ - - -. Fig 1 Comparison of the degrees of collection 1 Duration: 0 0 - 3 0 8 0 ZH8 Subject: Environmentally friendly process for the manufacture of vanadium oxides from va