Residence time distribution diagnosis on four lamps photochemical reactor
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2023-12-04 17:01
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SUDITU, Gabriel Dan, PUITEL, Adrian Catalin, DRAGOI, Elena Niculina, NECHITA, Mircea Teodor, PINTILIE, Loredana. Residence time distribution diagnosis on four lamps photochemical reactor. In: Achievements and perspectives of modern chemistry, 9-11 octombrie 2019, Chişinău. Chisinau, Republic of Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2019, p. 193. ISBN 978-9975-62-428-2.
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Achievements and perspectives of modern chemistry 2019
Conferința "International Conference "Achievements and perspectives of modern chemistry""
Chişinău, Moldova, 9-11 octombrie 2019

Residence time distribution diagnosis on four lamps photochemical reactor


Pag. 193-193

Suditu Gabriel Dan, Puitel Adrian Catalin, Dragoi Elena Niculina, Nechita Mircea Teodor, Pintilie Loredana
 
Gheorghe Asachi Technical University of Iasi
 
Disponibil în IBN: 11 noiembrie 2019


Rezumat

The four lamps photochemical reactor under study is the central element of a laboratory scale hybrid wastewater treatment system that combines photo, sono and chemical methods. It is equipped with four UV-C lamps protected with quartz tubes that can be used in three configurations of one, three or four at one time and it is designed to function either horizontally or vertically. Residence time distribution method (RTD) or “tracer” method was proposed by Dankwerts in 1953 [1] and was further developed by Levenspiel [2, 3]. Nowadays it is considered a classical analysis method and a convenient diagnosis tool for understanding the vessel hydrodynamic and characterization of flow systems [4]. A sodium chloride solution of 20% mass concentration was used as a tracer, the response being registered with a WTW conductivity meter Cond 315i. The RTD methodology was used to characterize mixing and flow inside the real reactor and to compare with an ideal model. Since the primary data, (obtained earlier) clearly indicated the occurrence of short-circuits (tracer leaving the photochemical reactor very fast) even at low volumetric flow rates, some design solutions were considered. The most appropriate from constructive point of view was the modification of the inlet nozzle geometry in such manner that the inlet flow would enter not parallel with the reactor axis, quartz tubes and walls (axial flow) as in the initial design but perpendicularly on the reactor axis (radial flow). Consequently, the quartz tubes could act like baffles or turbulence promoters improving the mixing within the reactor. This paper presents a RTD based comparative study of axial vs radial flow in horizontal and vertical set-up of a four lamps photochemical reactor. The evidence of short-circuits and dead-zones was experimentally demonstrated using the tracer method. Constructive design solution were considered in order to achieve a convenient mean residence time.