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Analysis of vortex finder geometry and its influence on cyclone's efficiency and wearing processes by computational fluid dynamics

Nowak T., Gawlik J., Schmidt J.

Management and Production Engineering Review

2011

Vol. 2, No. 1

27-33

Cyclones are widely used for removal dust of gaseous flows in industrial processes, and various studies were conducted in last decades to improve their performance parameters. However, in process industry, the reliable and uninterrupted operation of the cyclone is of the same importance as performance capabilities. In this work, the effect of vortex finder geometry on wearing processes is analyzed. The work relates to the gas-solid flow, which can be found in real dry-process kiln systems used in cement plants. Numerical studies were performed using Computational Fluid Dynamics software package, and covered three different geometrical versions of analyzed object. The relevant velocities of gas-solid medium within the cyclone, as well as pressure values were calculated with help of DES turbulence model. As a result - the design variant offering best balance between performance parameters and wearing resistance was pointed out.

Modelowanie procesów zużycia warstwy tocznej szyn o bardzo wysokiej wytrzymałości

Kuziak R., Molenda R.

Prace Instytutu Metalurgii Żelaza

2005

T. 57, nr 3

41-44

Wykonano badania modelowe procesów zużycia profili szynowych poddanych zabiegom umacniania cieplnego. Badania prowadzono za pomocą maszyny Amslera, stosując zróżnicowane wartości nacisku i współczynnika poślizgu w zakresie pozwalającym odtworzyć rzeczywiste warunki eksploatacyjne. Próbki po doświadczeniach modelowych badano metalograficznie w celu zidentyfikowania mechanizmów zużycia. Stwierdzono, że wykazują one około trzykrotnie większą odporność na zużycie ścierne w porównaniu do materiału pobranego z szyn naturalnie chłodzonych. Podstawowy mechanizm zużycia polegał na powstawaniu delaminacji, które w sposób uprzywilejowany inicjowane były wzdłuż granic byłego ziarna austenitu, granic kolonii i ziarnperlitu, a także na siarczkach MnS.

Model tests of wearing processes occurring in the rail sections subject to heat strengthening treatments were carried out. The tests were carried out with Amsler machine, by using different values of pressure and slip ratio within the range that allowed the real operating conditions to be reconstructed. After the model tests have been finished, the samples were subject to metallographic tests the aim of was to identify the wearing mechanisms. It was found out that they showed about three times higher resistance to the abrasive wear as compared to the material taken from the naturally cooled rails. The primary wearing mechanism was delaminations, which were initiated in the privileged way along the boundaries of the former austenite grain, boundaries of pearlite colonies and grains, as well as on MnS.