Page 63 - Impiantistica Italiana

Amec Foster Wheeler (now Wood). Heater ∏2 was unchanged, but the symmetrical
To increase radiant tubes fluid mass velocity at a piping system adopted to control the fluid distribu-
more appropriate value, the radiant process tubes tion to heater passes was upgraded with dedicated
and supports of heaters ∏1 and ∏3 were totally control valves for each pass. Such pass-dedicated
replaced with smaller diameter, in such a way that control valves replaced the existing total flow con-
no other modifications were required, except for trol valve.
refractory touch-up. The three dewaxing heaters ∏1/∏2/∏3 modified
Convection section of heaters ∏1 and ∏3 was in accordance with the recommendations of the
modified. The last two tube rows of heater ∏1 con- process study were put back in operation and a
vection section were replaced with smaller tubes dedicated test run confirmed the adequacy of the
designed with extended surface. The existing feed implemented solutions. The smooth operation in
pumps and control valves were checked. the new conditions pleased the customer to the full
The last three convection tube rows of heater ∏3 satisfaction of Kirishinefteorgsyntez.
were replaced with new smaller tubes designed
with extended surface. The existing feed pumps A special thanks to Emiliano Cogliati for his valuable
and control valve were also verified. contribution to the article

Mauro Bertolini

Mauro is a graduated Chemical Engineer with over chemical plants.
20 years’ experience as Thermal Design Manager He has executed diverse projects worldwide rang-
in in Fired Heaters group of Amec Foster Wheeler ing from refineries and chemical projects and his
(now Wood). Experiences include process design, experience includes activities at site for survey,
process follow-up during engineering execution, commissioning and start-up, test run of projects
proposal preparation and management of all types executed in Europe, Russia and former CIS coun-
of fired heaters in oil refining, petrochemical and tries, America, Asia and Middle East.

Daniele Brambilla

Daniele is a graduated Chemical Engineer, with refinery and petrochemical sectors.
over 12 years’ experience as Principal Thermal De- Daniele has executed diverse projects worldwide,
sign Engineer in Fired Heaters group of Amec Fos- ranging from refineries and chemical projects, in
ter Wheeler (now Wood). Experiences range from Asia (Russia, Kazakhstan, Thailand, Malaysia), Mid-
process design to detail engineering of all types of dle East (UAE, KSA) and Europe (Belarus, Ukraine,
fired heaters and waste heat recovery boilers, in oil Albania).

Trouble shooting e revamp di tre forni nell’unità di dewaxing
della raffineria di Kirishi in Russia

Uno studio termodinamico e fluidodinamico per individuare le cause dei
problemi a tre forni recentemente installati

La raffineria di Kirishi ha richiesto supporto al gruppo Fired Heaters della Amec Foster Wheeler (ora Wood).
Lo studio ha incluso una visita in campo finalizzata a effettuare la verifica dei forni per individuare possibili
soluzioni ai problemi riscontrati in campo su tre forni recentemente installati. Lo studio ha incluso la verifica
termodinamica e fluidodinamica dei forni di dewaxing ∏-1, ∏ -2 e ∏ -3 per individuare l’origine dei gravi
problemi meccanici occorsi ai tubi e potenzialmente in grado di minare l’integrità meccanica delle parti a
pressione. Lo studio basato sulla verifica dei parametri operativi del forno e su una simulazione del moto di
flusso ha determinato le cause principali dei problemi.
Sono state proposte e implementate delle modifiche per ovviare alle problematiche riscontrate e poter operare i
61
Impiantistica Italiana - Marzo - Aprile 2018
forni in modo sicuro ed efficiente.