Naslov
Design study of the heated surface discharge at the Sepen Site

Autori
Kuzmić, Milivoj ; Jeftić, Ljubomir ; Policastro, A J

Izvornik
Thalassia Jugoslavica (0495-4025) 16 (1980), 1; 17-30

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, stručni

Ključne riječi
heated surface discharge ; thermal plume modelling

Sažetak
The Dow Chemical Company and INA in a joint venture (DINA) are constructing a petrochemical complex at the Sepen Site on the Island of Krk in the Rijeka Bay. The design and loca­tion of the cooling water outlet is to be determined which satisfies the following criteria: (a) the plume from the discharge does not strike the opposite shore (with temperatures above lºC), (b) the plume does not raise the ambient temperature of the Bay inlet, and (e) the Jet discharge does not scour the bottom of the Bay. To aid in testing different alternative designs, preoperational measurements of relevant hydrographic and meteorological vari­ables in the site area have been made to provide the necessary input conditions for plume calculation. The measurements were made on four dates in different seasons of 1976 and 1977 and encompassed vertical profiles of temperature and. salinity, current speed and direction. After a preliminary evaluation of alternative designs, a detailed study was made of two most promising designs: (1) a slot of 0.5 m depth, and (2) circular port. For each of the two designs above, three possible exit temperature differences above ambient were considered, but with fixed total heat emission. These tem­perature differences were suggested by DINA where the largest temperature excesses were preferred. Employing the Shirazi-Davis surface thermal plume model, it was found that the round jet design was superior since it mixed the heated effluent sufficiently in the vertical direction to reduce surface temperatures without causing bottom inter­action. It was also found that the optimum location of the dis­charge is about 70 m offshore in 4 m depth water where the bottom drops off rapidly offshore. Plumes from the slot discharge were generally thin and encompassed larger surface spreading and temperatures than the round jet discharge. The case of high­est exit discharge temperature differences with both slot and round jet designs yielded larger surface plumes than all other cases tested due to suppressed vertical mixing arising from the greater buoyancy forces present. However, those plumes did strike the opposite shore. Among the different designs tested, a round jet discharge ·in the intermediate temperature· difference range best satisfied the design criteria.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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