Wyniki wyszukiwania - BazTech

1

Wpływ skali zbiornika na warunki wytwarzania zawiesiny lekkiej w obecności fazy gazowej

Karcz J., Mackiewicz B.

Inżynieria i Aparatura Chemiczna

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2006

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Nr 6s

108-109

EN

In the paper investigation results dealing with the suspension preparation in a mixer with the disc agitator are presented. Critical conditions for suspending of solid particles in the liquid phase were determined. The influence of particle concentration on the power input was analysed. The results obtained were elaborated using the Froude number in a form of the dimensionless correlation describing the influence of process parameters on suspension, formation.

2

Simulation of the gluconic acid production in the internal loop airlift bioreactor

Sikula I., Jurascik M., Markos J.

Inżynieria i Aparatura Chemiczna

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2006

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Nr 6s

212-214

EN

Airlift reactors have found potential application in biotechnology and chemical industries due to their simple construction and less performance costs compared with mechanically stirred tanks. However, an accurate description of their performance and "a priori" design are still difficult. This work deals with mathematical modelling of the fermentation process in an internal loop airlift reactor (IALR). To verify the simulation results, fermentation of gluconic acid by the strain Aspergillus niger has been chosen as a model system. Fermentation was carried out in three laboratory lALRs (each one with different scale of the reactor volume: 12, 40 and 200 litres). The parameters of the model, e.g. parameters of the kinetic model, mass transfer coefficients, circulation velocities and gas hold-ups were estimated by employing correlations available in the literature or independent experiments using model media. In the present paper the influence of different performance conditions (gas inlet flow rate, oxygen concentration in the feed gas, initial concentration of glucose) on the reactor behaviour is investigated. The results of simulations and experiments are in a sufficient agreement. The developed and tested model can be used as a very useful tool for process design, optimization and scale-up.

3

Design and scale-up of airlift bioreactors

Jurascik M., Sikula I., Annus J., Markos J.

Inżynieria i Aparatura Chemiczna

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2006

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Nr 6s

96-98

EN

In the presented paper the role of airlift bioreactor size and geometric design, and composition of fermentation broth on the liquid circulation velocity, gas hold-up and the oxygen mass transfer rate are investigated. Three laboratory internal loop airlift reactors (lALRs) with a different scale of total reactor volumes: 12, 40 and 200 litres were used. As a model system, transformation of glucose to gluconic acid using Aspergillus ni-ger strains was chosen. A comparison of hydrodynamic characteristics of lALRs with water - air system and three-phase real fermentation media was made.

4

Suspending in the stirrer tank equipped with various baffles

Broniarz-Press L., Borowski J., Trybus A.

Inżynieria i Aparatura Chemiczna

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2005

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Nr 5s

8-12

EN

Present study is concerned with, the experimental analysis of the effect of baffle shape (planar, tubular and half-tubular) on the uniform suspension of solid particles in an agitated vessel. It has been found that the most effective solution for suspending of solids is a tank equipped with tubular baffles. Optimal construction of mixers for both, liquid agitation and suspending of solids have been proposed.

PL

W pracy przedstawiono wyniki analizy doświadczalnej wpływu kształtu przegród (płaskie, rurowe, półrurowe) na wytwarzanie zawiesiny ciała stałego w mieszalniku. Wykazano, że najbardziej efektywnym rozwiązaniem jest zbiornik z przegrodami rurowymi. Zaproponowano optymalne konstrukcje mieszalników dla mieszania cieczy i wytwarzania zawiesin.

5

Problemy powiększania skali dla układów dyspersyjnych

Bałdyga J., Podgórska W.

Zeszyty Naukowe. Inżynieria Chemiczna i Procesowa / Politechnika Łódzka

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2000

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Z. 27

17-24

PL

W pracy przedstawiono i przedyskutowano metody powiększenia skali zbiorników z mieszadłem stosowane celem zapewnienia zbliżonych rozkładów wielkości kropel i agregatów cząstek ciała stałego w układach dyspersyjnych ciecz-ciecz i ciecz-ciało stałe. Przedyskutowano metody powiększenia skali wykorzystując klasyczną teorię burzliwości Kołmogorowa oraz teorię burzliwości uwzględniającą zjawisko intermittencji wewnętrznej (model multifraktalny przepływu burzliwego).

EN

A multifractal model of turbulence is used to predict the size of drops and aggregates and to interprete some popular methods for scaling up. New scaling method are considered as well.