Effect of interactions between spray jets on liquid distribution in a fluidized bed

Cedric Briens; Helal Elkolaly; Franco Berruti; Jennifer McMillan

doi:10.1002/cjce.22715

Effect of interactions between spray jets on liquid distribution in a fluidized bed

The Canadian Journal of Chemical Engineering ◽

10.1002/cjce.22715 ◽

2016 ◽

Vol 95 (4) ◽

pp. 680-687 ◽

Cited By ~ 3

Author(s):

Cedric Briens ◽

Helal Elkolaly ◽

Franco Berruti ◽

Jennifer McMillan

Keyword(s):

Fluidized Bed ◽

Liquid Distribution ◽

Spray Jets

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Enhancement of the Distribution of a Liquid Sprayed Into a Fluidized Bed

International Journal of Chemical Reactor Engineering ◽

10.2202/1542-6580.1122 ◽

2004 ◽

Vol 2 (1) ◽

Author(s):

David Zhou ◽

Mohammad Saberian ◽

Cedric Briens ◽

Franco Berruti ◽

Edward W Chan ◽

...

Keyword(s):

Fluidized Bed ◽

Evaporation Rate ◽

Water Solution ◽

Water Injection ◽

Fixed Bed ◽

Cylindrical Tube ◽

Invasive Technique ◽

Measured Concentration ◽

Liquid Distribution ◽

Wetted Area

In the fluid coking process, bitumen and steam are sprayed into a fluidized bed of coke particles. The liquid reacts on the surface of the hot particles to give distillate products, light gases and coke. A good primary particle/liquid mixing in the spray jet is required in order to achieve high yields of valuable products and minimize operability problems due to particles agglomeration or loss of bed fluidity.An Enhanced Solids Entrainment (ESE) device has been proposed to improve the mixing of droplets and particles during injection. It consists of a cylindrical tube mounted co-axially downstream of the spray nozzle. The objective of this study is to develop an effective and convenient non-invasive technique to quantify the improvements in liquid distribution on the particles that results from the use of ESE device.A slug of 30 vol% ethanol in water solution is sprayed into a fluidized bed of sand. The bed is defluidized shortly after the start of the ethanol water injection. Then, the gas-solid contacting pattern is changed to fixed bed, with downward airflow. The evaporation rate can be obtained from the measured concentration of ethanol in the gaseous effluent. The evaporation rate depends on the wetted area that is exposed to the gas. Good primary dispersion of the liquid on particles yields a large exposed wetted area and, hence, a high evaporation rate. A model is used to estimate the distribution of liquid on the particles from the measured evaporation rate.The experimental results show that the ESE device produces a more uniform primary liquid distribution on the particles, increasing by 7 to 21 % the mass of solids contacted by the injected liquid.

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