The
features of integral lump-shaped carrier include below for parts:
1)
mass transfer
2)
intra-particle diffusion
3) Bed pressure
drop
4）Heat transfer
As the limitation of mass transfer, the conversion rate
of graininess type catalyst is not only depending on its granule size but the
height of the reactor; usually the diameter of reactor must be longer than
granule 10 times. Thus the horizontal reactor is not suit for graininess type
catalyst. Besides, Because of the pressure fluctuation and the volume shrinkage
of catalyst during its working, or catalyst particles flowing caused by some mechanical
factor, it is easily channeling. Thus the static bed of graininess type
catalyst must be vertical installation, enable the air flowing from top to the
bottom or from bottom to the top of the catalyst to avoid short circuit because
of particles flowing.
The shape of integral lump-shaped
catalyst has no relationship with mass transfer, that is to say when the flow
rate is the same, the performance of the shinny and long integral lump-shaped
catalyst is the same with stubby shape. This property enables the integral lump-shaped
catalyst used in horizontal reactor, and special suit for catalyst installation
for waste gas treatment of car. Reaction matters (The Gaseous State or fluid
state) will not be mixed again when enter the channels of integral lump-shaped
catalyst, thus the reaction matter should be mixed fully before enter catalyst
bed to assure they will spread inside reactor uniformly.
