Aspen Technology Aspen Process Manual Contents 
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GC 5: Depth and Rigid Filters

GC 5: Depth and Rigid Filters
     Part 1: Introduction
     Part 2: State of the Art
         1 Granular Filters
             1.1 Savannah River and Related Filters
             1.2 Fixed Bed with Fluidised Expansion Cleaning
             1.3 Panel Beds
             1.4 Vibratory Beds
             1.5 Raked or Agitated Beds
             1.6 Dry Plate Scrubber
             1.7 Other Types of Filter Bed
             1.8 State of the Technology
         2 Filtration in Mobile Granular Beds
             2.1 Fluidised Beds
             2.2 Spouted Beds
             2.3 Electrofluidised Beds
         3 Fibrous Filters
             3.1 Ventilation filters
                 3.1.1 Oil wetted
                 3.1.2 Dry cell
                 3.1.3 Cartridge
                 3.1.4 Bag/Envelope
                 3.1.5 Roll filters
             3.2 High Efficiency Particulate Air (HEPA) filters
                 3.2.1 Rectangular filters
                 3.2.2 Circular filters
             3.3 Filter test methods
                 3.3.1 Bench-Testing
                 3.3.2 In-situ Testing
                 3.3.3 Comparisons between test results
             3.4 The classification of filters by efficiency
         4 Magnetic Separation
             4.1 Magnetically-stabilised granular bed filter
         5 Ceramic Filters
             5.1 Ceramic Fibre Filters
                 5.1.1 Woven Fabric Filters
                 5.1.2 Felted Fabric Filters
             5.2 Rigid Porous Filters
                 5.2.1 Ceramic Cross-flow Filters
                 5.2.2 Ceramic Candle Filters
                 5.2.3 Ceramic Through-flow Filters
         6 Metallic Filters
             6.1 Woven Wire
             6.2 Knitted Wire
             6.3 Perforated Metals
             6.4 Expanded Metal
             6.5 Electroformed
             6.6 Porous Sintering
                 6.6.1 Metal powders
                 6.6.2 Metal fibres
             6.7 Growth of Metal Whiskers
         7 High Temperature and Pressure
         8 REFERENCES
         9 APPENDICES
             9.1 APPENDIX 1: Filter Media
             9.2 APPENDIX 2: Manufacturers Address
     Part 3: State of the Science
             1.1 Stationary and non-stationary filtration
             2.1 Flow field models
             2.2 Collection mechanisms
                 2.2.1 Inertia
                 2.2.2 Interception
                 2.2.3 Diffusion
                 2.2.4 Gravitational
                 2.2.5 Combination mechanism
                 2.2.6 Electrostatic attraction
                 2.2.7 Phoretic effects
                 2.2.8 Magnetic
             2.3 Fibrous filter collection efficiency
                 2.3.1 Single fibre efficiency
                 2.3.2 Fan model
             2.4 Granular filter collection efficiency
                 2.4.1 Fixed beds
                 2.4.2 Mobile beds
             2.5 Magnetic separation efficiency
         3 PRESSURE DROP
             3.1 Fibrous filter
             3.2 Granular filters
         5 REFERENCES
         6 APPENDIX 1: Air Permeability
     Part 4: Industrial Application and Design

This Volume covers all principal types of depth filters, giving equipment surveys, mechanisms and applications for each type.

Part 1 Introduction
Part 2 State of the technology
Part 3 State of the science
Part 4 Industrial application & design

Volume GC V  Part 1 Introduction.

The wide range of gas cleaning categories which are included in this manual will be outlined, as well as the influence of legislation on their usage. A brief resumé of the limits of each category will aid in rapid evaluation for a given application.

Volume GC V  Part 2 State of the technology. 

This part includes pre-filter technology, HEPA and ULPA filters, fibrous filters, candle filters made from rigid metal or ceramic media, and those used for high temperature, nuclear and aerospace applications. Magnetic and granular bed filtration are also covered. New materials in particular are dealt with, including modern HEPA media, new ceramics, and high specification metallic materials.

Separations at high temperature and pressure, in granular and fluidised beds which have been covered in detail in existing reports, have been updated and incorporated into the manual.

Old style SARs which exist on gas cleaning under hostile and difficult conditions, and under stringent conditions, have and also been incorporated into the manual.

A review of current filter designs, seals and media is included.

Volume GC V  Part 3 State of the science. 

The focus here is on the theory of particle collection in filters and include all major phoretic effects and combined mechanisms. It thus provides a comprehensive review of particle collection theory. Models for predicting performance are also reviewed.

Volume GC V  Part 4 Industrial application and design. 

Design procedures in depth and rigid filters are largely based on experience and media selection expertise, but this is based on a number of manageable rules. These will be reviewed and presented in a usable form.