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For Corrosive Mists, Gases and Entrained Solids.
 The
high-efficiency packing for air pollution control with lower equipment
costs and operating expense.
- Up to 35% free volume.
- 25% the weight of ceramic packing.
- No breakage in loading.
- Two to three times more interstitial hold-up points.
- Non-wetting surface for better gas absorption.
- Lower pressure drops as much as 86%.
- Non-plugging.
Johndec Concept Revolutionises - Mass Transfer Engineering
Johndec packing now has more than 20 years of successful service
behind it. Industry now uses Johndec Packing to solve any gas
absorption and air pollution control problems involving mass transfer.
The invention of this packing was the result of a new insight
into a major mass transfer principle: Re-generation of the scrubbing
liquid surface which maximises absorption capacity is of far more
critical importance to gas absorption efficiency that the need
for large surface areas - based on which conventional packing
is often used.
Johndec packers create greater liquid surface regeneration -
and 30% to 40% greater gas absorption capacity. It's unique helical
toroid design provides significantly superior agglomeration/dispersion
of liquid drops.
Johndec Packers greater free area permits greater gas throughput.
The superior gas absorption and higher capacity are achieved with
lower energy requirements - smaller fans and pumps, lower horsepower
- than required by any other type of packing.
Advantages of Converting to Johndec Packers
- Increase gas flow capacities.
- Improve scrubbing efficiencies to high levels.
- Provide efficiencies to 99.95% in gas absorption towers.
- Non-plugging with moderate dust loadings.
- Eliminate future cost of replacing packing. Minimise investment
in fume scrubbers.
- Reduce daily operating costs, replacing conventional ceramic
or other ting-type packing with permanent Johndec Packers immediately
provides the user many of the operating advantages listed above.
- Converting to Johndec Packers may also eliminate the need
for adding or replacing existing equipment in order to accommodate
growing plant operation. Higher scrubbing efficiencies provided
by replacing old packaging with Johndec Packers may also permit
the user to comply with new pollution control legislation.
Liquid Distribution Characteristics
As a result of the droplet flow mechanism, mal-distribution
of liquid does not occur within heights of packing as great as
nine metres. This means high efficiency at low liquid flows. Considerable
savings are achieved since there is no need for expensive redistributors
with their corresponding extended column length requirements.
The use of intermediate support trays are necessitated only by
the temperature effect on the structural stability of the packing.
Recommended intermediate support distance is as follows:
- 3 metres at 100 degrees Celsius.
- 4.5 metres at 90 degrees Celsius.
- 6 metres at 50 degrees Celsius.
- Below 50 degrees Celsius, there should be an immediate support
plate at nine metre intervals.
For Best Gas Absorption
The superior gas absorption capacity of Johndec Packers
compared to other types of packing. A given fresh drop of scrubbing
liquid goes through a series of agglomeration/dispersion/surface
renewal cycles as it passes over the Johndec Packer filaments.
The relatively slight liquid surface renewal in the other conventional
packing designs is achieved largely through a surface "rippling"
obtained at the expense of higher energy costs.
For Removal of Entrained Particles
With its unique filamentous helical toroid shape, Johndec Packers
packing can be used effectively as an entrained liquids and solids
from air steams. This is accomplished by allowing the air stream
to pass through or around fixed targets interposed in its path.
Since Johndec Packers packing offers smaller impingement targets
- and significantly more targets per cubic metre than any other
extended surface packer - higher efficiencies are obtained. Because
the suspended liquid or solid particles have greater inertia,
they will tend to impact and deposit on this target rather than
following the air around the target the better chance it has of
striking the target and being removed.
Design Advantages of High-Efficiency
- 20% to 50% Lower Column Heights.
- 40% to 70% Smaller Columns Diameters.
- 75% Lighter Internals.
- Smaller Fan and Motor Requirements.
- Higher Flooding Limits.
- Good Efficiencies at Low Rates.
The combination of the low weight (120KG m3) and the use of smaller
towers for the same service, permits lighter shell construction.
A further significant advantage is that "open" support
plates of inexpensive construction can be used. This produces
a significant saving over the complex cap-type support plate necessary
for heavier packing.
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