Engineering Commons^™

Impact Of Local Fluidized Bed Hydrodynamics On The Distribution Of Liquid Sprayed Into The Bed, Yuan Li

Electronic Thesis and Dissertation Repository

In Fluid Coking, heavy oil is sprayed into a fluidized bed of hot coke particles that provide heat for the reaction and vaporization of the products, using nozzles located at different radial and axial locations of the reactor. In industrial units, imperfect initial liquid-solid contact results in the formation of wet agglomerates, which have been shown to cause fouling of the stripper sheds.

This thesis aims to reduce agglomerate formation by modifying the bed hydrodynamics in the spray region by adjusting the initial fluidization gas distribution or using a baffle.

Experimental methods were developed to study local gas flow, solids …

Development And Application Of An Experimental Model For The Fluid Coking Process, Carolina B. Morales

Electronic Thesis and Dissertation Repository

Liquid injection into a fluidized bed is used in industrial applications such as the Fluid Coking^TM process for heavy oil thermal cracking. Poor initial liquid-solid contact results in the formation of agglomerates that limit heat and mass transfer processes, reduce the yield of valuable compounds and create operating problems. The present study develops a new experimental model to simulate the complex phenomena that occur when heavy oil is injected in a Fluid Coker through two-phase nozzles. The model is applied in a pilot scale fluidized bed using scaled-down industrial spray nozzles. The experimental results indicate that agglomerate formation slows …

Developing Novel Methods To Characterize Liquid Dispersion In A Fluidized Bed, Masoumeh Farkhondehkavaki

Electronic Thesis and Dissertation Repository

The performance of several important industrial processes, such as fluid coking or fluid catalytic cracking, is dependent on the good distribution of liquid feed sprayed into a fluidized bed of hot inert or catalytic particles, respectively.

Liquid injected into a fluidized bed is distributed in three different ways: (i) free moisture, or liquid coating individual particles; (ii) wet micro-agglomerates, which are fluidized; and (iii) wet macro-agglomerates, which settle to the bottom of the bed. This study develops and evaluates various methods for the determination of this moisture.

In the study using electrical techniques, two different kinds of electrodes geometries are …