The effects of operating conditions on the pressure variation at the bottom of a 16.6 cm i.d. reciprocating plate column

• Published in: Chemical Industry and Chemical Engineering Quarterly 2005, Vol.11 (4), p.195-202
• Main Authors: Vasic, Ljubisa, Bankovic-Ilic, Ivana, Lazic, Miodrag, Veljkovic, Vlada, Skala, Dejan
• Format: Article
• Language: English
• ISSN: 1451-9372; 2217-7434
• DOI: 10.2298/CICEQ0504195V

The effects of the intensity of vibration, superficial gas velocity, content of solid particles and rheology of the liquid phase on the total and time-averaged pressure variation at the bottom of a 16.6 cm i.d. reciprocating plate column were studied. The total and time-averaged pressure variation at the column bottom were found to increase with increasing vibration intensity, liquid viscosity and content of solid particles, but to decrease with increasing superficial gas velocity. The pressure variation at the column bottom was greater in the column filled with CMC solutions than in the one with distilled water. The pressure variation at the column bottom was correlated with the vibration intensity and the liquid phase hold-up. The pressure variations at the bottom of columns of different diameter were also compared. The orifice coefficient for plates of approximately the same free fraction area was found to decrease with increasing column diameter. U radu je ispitivan uticaj intenziteta vibracije, prividne brzine strujanja gasa, udela cvrstih cestica i reoloskih osobina tecnosti na ukupnu i srednju promenu pritiska na dnu kolone sa vibracionom mesalicom precnika 16,6 cm. Srednja i ukupna promena pritiska na dnu kolone sa vibracionom mesalicom se povecavaju sa povecanjem intenziteta vibracije, viskoznosti tecnosti i udela cvrstih cestica, a smanjuje sa povecanjem prividne brzine strujanja gasa. Pri istim ostalim operativnim uslovima, promena pritiska na dnu kolone je veca kod rastvora karboksimetilceluloze nego kod vode. Izvedene su empirijske korelacije koje povezuju promenu pritiska na dnu kolone sa intenzitetom vibracije. Izvrseno je, takodje, poredjenje promene pritiska na dnu kolona razlicitog precnika. Sa povecanjem precnika kolone kod KVM sa plocicama priblizno iste povrsine slobodnog preseka smanjuje se vrednost koeficijenta otvora.