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hSP - Structured Packing Bed
The ‘helier-Structured Packing’ has different diameters ( 1`` - 1,5`` - 4`` - 12` ). Geometrically they apply the synergy arising from the contemporary use of two “simple surfaces:the cylinder, the helix included inside. Thanks to this property and to their specific Diameter/Helix ratio , the ’helier – Structured Packing’ - hSP – have: High Specific Transfer Areas (from 80 m2/m3 up to 320 m2/m3), the lowest Pressure Drops per Trasfer Unit η DP*Hog [mmH2O].
As a consequence of their geometry and of the fluid-dynamic properties of the passing phases , the ‘helier - Structured Packing’ have
- no engulfing velocity
- the highest wet area/specific area ratio
- the lo west pressure drops Delta P: (mm H2O/m)
- the lowest specific pressare drops DP*HOG (mm H2O)
- High Mass Transfer Coefficient both for
- gas phase resistance: (SO2)
- liquid phase resistance: (CO2, NH3)
when compared to other solutions
These properties have been duly documented by the Industrial Research done by the University of Pisa and by the consequent scientific bibliography than edited , such as :
A) “ An Economic Analysis on Packed Columns for Absorption ”
Elisabetta Brunazzi, Giuliano Nardini and Alessandro Paglianti
B) “ Performance of Absorption Columns Equipped with Low Pressure Drops Structured Packing ”
Pier Massimiliano LAunaro and Alessandro Paglianti
C) “ Absorption of Nitrogen Oxides in Columns Equipped with Low Pressure Drop Structured Packing ”
Edoardo Decanini, Giuliano Nardini and Alessandro Paglianti
D) “ Studio Teorico Sperimentale sui Riempimenti Tipo Jet-Helix ”
Pier Massimiliano Launaro
E) “ An Economical Criterion for Packed Absorption Column Design ”
Elisabetta Brunazzi, Giuliano Nardini and Alessandro Paglianti and published by primary papers and institutions such as:
A) La Chimica e L’Industria
B) Industrial Engineering & Chemical Research
C) Chem. Biochem. Eng
D) Dipartimento di Ingegneria Chimica – Università di Pisa.
E) Chem. Biochem. Eng
The result of these indipendent evaluation performed by experts universally knoens in the Mass Transfer sector is that the ‘helier - Structured Packing’ have the
- lowest pressue drops per transfer unit
- lowest column operating cost
when compared to other systems.
The construction of the structured packing bed is done using the helier packing `without windows` (closed) . The internals have
- a specific exchange area between 80 and 320 m2/m3
- an high value of the available wet area
- the hightest ratio betwenn wet area/specific area
After the choice of the proper packing and after the proper design of the Structured PAcking Bed so to complain with the
Specifications of the application
the construction of the Structured Bed Needed starts.
The Structured Bed Needed is build and pre-assembled in the workshop on the base of
Strictly technical specifications
tha are relevant to the industrial application for which the Structured Bed is built.
These technical specifications for the construction of each Structured Packing Bed include:
- the diameter of the packing (Dhelier)
- the Number of Columns (N°COL)
- the Number of Elements (N°EL)
- the Geometry of Distribution
- the Materials
AVAILABLE DIAMETERS
Available in different diameters ( 1`` - 1,5`` - 4`` ) the helier-Structured Packing
- are characterized by modularity of assembling
- provide the construction of structured packing bed that can be directly inserted into columns (also existing columns)
AVAILABLE MATERIALS
The hSP packings are made in plastic materials and can be done with different materials such as
- HDPP: High Density Polypropylene
- PS : Poly-Sulphonates
- PPS : Poly-Phenylene-Sulfide
- MOPLEN : various
The choice of the material is properly done in accordance to
- the process parameters
- the resistance to Chemical Agents
- the resistance to Temperature
Engineering and Design of an helier Structured Packing Bed
The helier Structured Packing and the relevant Structured Packing bed were subjected to an experimental industrial research and have been the subject of a degree thesis, as reported above.
The experimental analysis was conducted in two different steps:
Phase 1 : Experimental characterization of geometrical and fluidodynamic properties of helier packings
June 1997 ÷ September 1998
Phase 2 : Experimental data analysis and identification of a computation model for gas phase and liquid phase resistance
September 1998 ÷ February 1999
The results achieved, and, in particular, the identification of a mathematical estimation model for mass transfer resistance both in gas phase and in liquid phase, were a target not planned when we started the research.
The identification of a mathematical estimation model made it possible the development of a software system for
- the design
- the simulation of columns
with helier – Structured Packing in the Absorption, Desorption and Stripping operations.
Today we have the simulation software system (SSS) obtained from the mathematical estimation model developed after the cocnlusion of the Experimental Activity.
When we have to design any application for the use of the helier Structured Packing – hSP and, hence, build the proper Structured Packing Bed we apply the following software:
- helier – Assorbimento 3.0
- helier – Desorbimento 2.5
The helier Structured Packing - hSP - are prepared and preassembled in the workshop in accordance to the design required by the application.
Each hSP is assembled so to form a Structured Packing Bed that, after delivery, it is ready to be easly inserted in the column
where it will be used.
Some mechanical details to fast and to facilitate the insertion of the Structured Packing Bed in the column may vary from application to application, in accordance to
- specifications
- materials
Usually the Structured Packing Bed is inserted from the Top, as per near by photo. The way on how to properly insert the Structured Packing Bed previously preassembled in the workshop is of course influenced by the application.
The helier Structured Packing - hSP - can be used in all the Mass Transfer Operation ( Absorption, Desorption, Stripping, Washing ... Cleaning ) and its application guarantees
- an High-efficiency
In particular, the Structured Packing Bed using the helier Structured Packing - HSP - are succesfully used for the folllowing Mass Transfer Operations :
- Liquid / Liquid Operation
- Gas / Liquid Operations
- Absorption of NOx
- Stripping
- Drying
- Distillation
- Distillation with Solvent