static bed

static bed

[′stad·ik ′bed]
(chemical engineering)
A layer of solids in a process vessel (absorber, catalytic reactor, packed distillation column, or granular filter bed) in which the particles rest upon one another at essentially the settled bulk density of the solids phase; contrasted to moving-solids or fluidized-solids beds.
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References in periodicals archive ?
The height of the static bed containing the material was 100 mm.
The Effect of static bed height on the pressure distribution along the fluidized bed was investigated in this paper as well as the expansion of the bed.
Initially, the particles were loaded as a static bed. At the start of simulation gas flow is introduced to the bottom of column uniformly.
Again, with the increase in initial static bed height ([H.sub.s]), the bed expansion and fluctuation ratios are observed to decrease because of more materials in the bed requires more flow of fluid to fluidize.
List of symbols f frequency of sound(Hz) H static bed height (cm) [increment]P pressure drop across the bed (cm of water) Pressure Drop cm of water [U.sub.mf], [U.sub.mfo] minimum fluidization velocity without sound (cm/s) [U.sub.mfs] minimum fluidization velocity with sound (cm/s) [U.sub.mbs] minimum bubbling velocity with sound (cm/s) [U.sub.o] superficial gas velocity (cm/s) SPL sound pressure level (dB) W bed particle loading (kg)
Each four-tank system includes a microscreen rotating drum filter and protein skimmer for removal of solid and suspended wastes, a moving or static bed biofilter for ammonia and nitrite removal, supplemental oxygenation that is monitored and controlled using oxygen sensors and PLCs, micro-bubble aeration diffusers, centrifugal pumps and propeller pumps for water movement, UV sterilizers for return water disinfection, and degassing columns for [CO.sub.2] removal.
Simplicity and good agreement of the predictions of this model with the experimental results perhaps encouraged subsequent researchers to use static bed models in future.
where Z is the vertical coordinate measured from the bottom, [H.sub.s] the static bed height, [DELTA][P.sub.z] the gauge pressure at Z, and [DELTA][P.sub.s] the pressure drop across the whole bed.
Topics include the effect of static bed height on the combustion of rice husk in a fluidized bed combustor, alternative bed materials for high alkali fuels, the fouling tendency of ash from burning mixtures of biofuels, and reactivation of CFBC ash by sonic energy.
Measurements of the total pressure drop in the spouted bed system as a function of gas velocity were obtained for several static bed heights for both particle diameters.