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Entrained Bed Reactor. Quak Foo Lee Department of Chemical and Biological Engineering. Entrained Bed Reactor. Entrained bed, pneumatic transport reactor Riser reactor, raining bed reactor Dilute suspension of solids and usually reactors have large L/D ratio Near plug flow

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entrained bed reactor

Entrained Bed Reactor

Quak Foo Lee

Department of Chemical and Biological Engineering

entrained bed reactor1
Entrained Bed Reactor
  • Entrained bed, pneumatic transport reactor
  • Riser reactor, raining bed reactor
    • Dilute suspension of solids and usually reactors have large L/D ratio
    • Near plug flow
    • If feed particles are all of the same size, them all have same residence time
entrained bed reactor2
Entrained Bed Reactor
  • Advantage is one can control the residence time
  • Small particle and co-current flow
  • Simplified analysis
    • Flat velocity profile for gas
    • Plug flow of solids
    • Isothermal
    • Constant fluid properties
reactor configurations
Reactor Configurations

Gas + Solid

Down flow

Up flow

D

L

Gas + Solid

riser reactor
Riser Reactor

Upward particle velocity

Superficial

gas velocity

Settling velocity of particle

Gas + Solids

Terminal velocity of a single particle in an unbounded fluid

Note: Concentration of solids is low

example
Example
  • If we considered U0 ~Up, and we have 1 mol of gas reacting with 1 mol of solid of Mwt = 100 g/mol and p = 2 g/cm3
slide10
For uniform gas composition
  • Plug flow of solids

Where,  = time for complete reaction

for strokes region and scm
For Strokes Region and SCM
  • With no Mass Transfer (MT) of Product Layer Diffusion (PLD) Resistance:
critical point
Critical Point

Goes through a maximum

at some critical R

Hcrit

Hmax

HXs=1

Rcrit

R

find h crit and r crit
Find Hcrit and Rcrit
  • Differentiate HXs=1
find h crit and r crit1
Find Hcrit and Rcrit
  • Substitute Rcrit into HXs=1 to get Hcrit

Note: To transport largest particles through the system:

within the strokes region
Within the Strokes Region

Substitute U0 into Hcrit to get

Up flow

notes
Notes
  • Comparison indicates Rcrit ~ 0.77 Rmax
  • One would do a similar calculation for any expression for τ and also can use more general equation for CD.
  • Note: for CA,f to be constant, e.g. at some over reactor height, we need small gas conversion (or large molar excess of species A in gas phase).
down flow raining bed
Down Flow – Raining Bed

Gas + Solid

For some simplified case:

At

For chemical reaction controlling:

Down flow

recall
Recall

Up flow

Down flow

Ratio