000			01872nmc a2200169 4500
005			20260522172144.0
008			260224s xxu
100	1		_aKnowlton, T.M. _912702
111	2		_aCongreso Latinoamericano de Refinación (2 do. : 2009 nov. 1-4 : Mendoza, Argentina) _944897
245	0	0	_aPressure buildup in standpipes
270			_a2011-04-18 ; 04/04/2011
300			_a18 p.
520			_aTranscripción del resumen del autor. Standpipes are an important element in Fluidized Catalytic Cracking (FCC) units. They supply the pressure buildup required to "drive" the solids through a controlling slide valve at the catalyst flux required. Most operators assume that the buildup in a fluidized underflow standpipe (the type used in FCC units) should be equivalent to the material's fluidized density multiplied by the length of the standpipe. Certainly, this is the maximum buildup possible in the standpipe, but standpipes do not always operate at this maximum pressure buildup condition. One reason that the standpipe does not always operate at its optimum pressure buildup condition is that the standpipe also serves another function in the pressure balance loop. The standpipe is the only element that can adjust itself to automatically balance the pressure drop in the circulation loop. Because of this, the standpipe does not always operate at optimum (maximum pressure buildup) conditions - it is constrained by the parameters of the pressure drop loop. If these constraints occur, standpipe pressure profiles and gas flows in the standpipe will be adjusted automatically to allow the pressure balance to occur, and negative standpipe buildups are even possible in certain limiting situations.
856			_uhttps://biblioteca.iapg.org.ar/ArchivosAdjuntos/2doCongresoLatRefinacion/99.pdf
942			_cCONGTP _2ddc
999			_c174456 _d174456