CFD analýza proudění ve Venturiho vypírce

Computational fluid dynamics simulation of venturi wet scrubber

článek ve sborníku ve WoS nebo Scopus

en

Environmental regulations limiting atmospheric emissions of pollutants are progressively becoming stricter. It is therefore necessary to develop new flue gas cleaning technologies and improve already existing ones. To achieve this, it is important to apply in the design phase new, more reliable modelling approaches to process description, like computational fluid dynamics (CFD). This way, we can obtain better understanding of processes, occurring inside the respective devices. Namely, the present work is concerned with wet scrubbing process, which is one of the most popular methods of flue gas cleaning. One of the biggest handicaps of wet scrubbing is a large pressure drop. Its prediction is a difficult task, requiring modelling of the flow in the wet scrubber. Two-phase flow, which occurs in the wet scrubbing process, is typically described more or less successfully by empirical correlations. However, recent advances in computer technology and CFD modelling of two-phase flows open the door for simulations as an attractive alternative to empiricism. This work is concerned with characterization of two-phase flow in a venturi scrubber using commercial code FLUENT 6.2. Euler-Euler model is employed. Computations are performed for laboratory equipment and the results are validated by measured pressure drop data.

Emisní limity znečišťujících látek se progresivně zpřísňují. Je proto nutné vyvíjet nové technologie čištění spalin a stávající technologie zlepšovat. Abychom toho mohli dosáhnout, je důležité využívat již při návrhu zařízení nové přístupy k popisu procesů jako je CFD (computational fluid dynamics). Touto cestou můžeme dosáhnout lepšího porozumění procesům, probíhajícím v příslušných aparátech. Zde prezentovaná práce se zaměřuje na mokré praní, které je jednou z nejoblíbenějších metod čištění spalin. Jednou z největších nevýhod tohoto procesu je velká tlaková ztráta. Její předpověď je těžkým úkolem, vyžadujícím modelování proudění z tomto zařízení. Dvoufázový tok, který se při tomto procesu uplatňuje, je více či méně úspěšně popisován empirickými korelacemi. Současný pokrok ve výpočetní technice a simulace dvoufázového proudění nabízí k empirii atraktivní alternativu. Tato práce se zabývá popisem proudění ve Venturiho pračce použitím komerčního výpočetního programu FLUENT 6.2. Je použit model Euler-Eulerův model. Výpočty jsou prováděny pro laboratorní zařízení a výsledky srovnány s naměřenými daty tlakové ztráty.

Environmental regulations limiting atmospheric emissions of pollutants are progressively becoming stricter. It is therefore necessary to develop new flue gas cleaning technologies and improve already existing ones. To achieve this, it is important to apply in the design phase new, more reliable modelling approaches to process description, like computational fluid dynamics (CFD). This way, we can obtain better understanding of processes, occurring inside the respective devices. Namely, the present work is concerned with wet scrubbing process, which is one of the most popular methods of flue gas cleaning. One of the biggest handicaps of wet scrubbing is a large pressure drop. Its prediction is a difficult task, requiring modelling of the flow in the wet scrubber. Two-phase flow, which occurs in the wet scrubbing process, is typically described more or less successfully by empirical correlations. However, recent advances in computer technology and CFD modelling of two-phase flows open the door for simulations as an attractive alternative to empiricism. This work is concerned with characterization of two-phase flow in a venturi scrubber using commercial code FLUENT 6.2. Euler-Euler model is employed. Computations are performed for laboratory equipment and the results are validated by measured pressure drop data.

Venturi scrubber, two phase flow, off gas cleaning, CFD, pressure drop

2006

27.08.2006

Process Engineering Publisher

Praha

80-86059-45-6

CHISA 2006 Summaries 3 - Hydrodynamic Processes

8