Enhancement of the liquid feed distribution in gas‐solid fluidized beds by nozzle pulsations (induced by solenoid valve)

Sabouni, Rana; Leach, Aidan; Briens, Cédric; Berruti, Franco

doi:10.1002/aic.12538

Cited by 13 publications

(11 citation statements)

References 13 publications

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“…The jet penetration is predominantly related to the liquid flow rate, as shown in Figure 14, and there is a weak relationship between gas flow rate and jet penetration (Figure 15). In addition, this finding can be confirmed by the results obtained previously using a solenoid valve to impose pulsations of well‐defined frequency and described in the authors' previous work 15. Figure 16 shows that, for these earlier experiments, there also was a relationship between instantaneous liquid flow rate and jet penetration.…”

Section: Resultssupporting

confidence: 84%

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Enhancement of the liquid feed distribution in gas solid fluidised beds by non‐mechanically induced nozzle pulsations

2013

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The effect of non-mechanically induced nozzle pulsations was investigated in the current work, and it was found that appropriately tailored spray nozzles pulsations resulted in the dramatic improvement of the liquid feed spray distribution on particles of a fluidised bed. Non-mechanically induced pulsations were imposed on the liquid spray, using liquid and gas circuits that favour the development of beneficial pulsations. The resulting effect on liquid dispersion on the fluidised bed particles was determined with a conductance method.Keywords: non-mechanically induced pulsations, liquid and gas flowrates, nozzle performance index (NPI), air to liquid ratio (ALR), fluidised bed *

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Section: Resultssupporting

confidence: 84%

“…On the other hand, the authors' previous work15 showed that pulsations with the right characteristics can be very beneficial. For example, imposing liquid flow pulsations with a solenoid valve closing and opening with a frequency of 1–10 Hz nearly doubled the NPI.…”

Section: Introductionmentioning

confidence: 98%

Enhancement of the liquid feed distribution in gas solid fluidised beds by non‐mechanically induced nozzle pulsations

2013

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“…This can easily lead to the destabilization of the bed, and plugging of the product disengagement lines. Unfortunately, the majority of the open scientific literature in this field appears to be dedicated to studying how best to wet particles in an FCC solid–gas bed, which is pretty much the opposite of what we want to do here. What is clear from the open patent literature is that the number and positioning of the nozzles in the bed, their depth of penetration and orientation, the velocity and direction of the liquid stream will all be very important parameters in obtaining optimal liquid injection conditions .…”

Section: Fundamentals Of Condensed Mode Cooling In Modern Pe Plantsmentioning

confidence: 97%

Condensed Mode Cooling of Ethylene Polymerization in Fluidized Bed Reactors

McKenna

2018

Macro Reaction Engineering

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This review gives an overview of the evolution of the technology of condensed mode cooling, primarily for the case of ethylene polymerization on supported catalysts in fluidized bed reactors. It is well known that this mode of heat removal is quite effective in allowing polyolefin manufacturers to increase significantly production rates. What is perhaps less well understood are all of the issues that, in addition to the effect of the latent heat of vaporization of injected liquid components, also have an impact on the rate of production and behavior of the reactor. However, the liquid components injected into the reactor can vaporize rapidly under full‐scale conditions, leaving behind several heavy components (with respect to ethylene) that have numerous effects on how the particles behave, on the reaction rate, and on fluidization, fouling, and other parameters related to reactor and process performance.

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“…Sabouni et al used the active conductance technique from a previous study to study the effect of nozzle pulsations on the quality of liquid‐solid contact in a laboratory scale fluidized bed. The study focussed on gas‐line pulsations that were milder than those of previous studies and where the instantaneous gas‐to‐liquid (G/L) ratio in the nozzle was never reduced all the way to 0 wt %.…”

Section: Introductionmentioning

confidence: 99%

Use of pulsations to enhance the distribution of liquid injected into fluidized particles with commercial‐scale nozzles

et al. 2012

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Gas‐atomized liquid injections into fluidized beds are commonly used in industrial processes such as fluid coking, fluid catalytic cracking (FCC), and pharmaceutical granulation, where it is important to optimize the distribution of the injected liquid to prevent the formation of unwanted liquid–solid agglomerates and maximize product yields. This injection is typically a two‐phase, gas‐atomized liquid injection. One issue with such a liquid injection is that most of the liquid is deposited at the end of the jet tip within the reactor. This study proposes introducing artificial fluctuations into the injection flow, which causes the jet penetration to vary, allowing for a more even spread of liquid throughout a fluidized bed reactor. The effect of artificial pulsations in the atomized injection, of various frequency and amplitude, was investigated in this study. Using pulsations, greatly enhanced the liquid distribution on the bed particles. © 2012 American Institute of Chemical Engineers AIChE J, 59: 719–728, 2013

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Enhancement of the liquid feed distribution in gas‐solid fluidized beds by nozzle pulsations (induced by solenoid valve)

Cited by 13 publications

References 13 publications

Enhancement of the liquid feed distribution in gas solid fluidised beds by non‐mechanically induced nozzle pulsations

Enhancement of the liquid feed distribution in gas solid fluidised beds by non‐mechanically induced nozzle pulsations

Condensed Mode Cooling of Ethylene Polymerization in Fluidized Bed Reactors

Use of pulsations to enhance the distribution of liquid injected into fluidized particles with commercial‐scale nozzles

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