Particle Separation and Filtration

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Code Completion Credits Range Language
E161005 Z,ZK 5 3P+1C English
Jiří Hemerka (guarantor), Pavel Vybíral
Jiří Hemerka (guarantor), Pavel Vybíral
Department of Environmental Engineering

Fundamentals of the particle separation from flue gases and working knowledge for choice and dimensioning type of the separator.

Theory of particle separation in the fibrous filter layer, classification and use of room air filters and HEPA filters. Industrial fabric filters - performance, filter media, use.


Following requirements are demanded: Particle properties and individual separation principles and separation velocities. Basic types of particle separators and its properties and field of use. Total and grade efficiency of separation.

Following requirements are demanded: Flow field around single fibre. Separation principles and overall grade efficiency of separation of single fibre and of the filter layer. Pressure drop of the filter layer and of the whole filter unit. Classification and use of filters for general ventilation. HEPA and ULPA filters and clean rooms. Industrial filtration - performance, choice of filter material and dimensioning the filter area.

Syllabus of lectures:

Particle size and particle size distribution. Particle properties. Particulate matter removal. General equation of particle motion. Gravitational, inertial, centrifugal and electrical principle of separation. Diffusion of particles. Total and grade efficiency of separation. Pressure drop. Classification of particle separators, characteristic features.

Industrial fabric filters and atmospheric air filters - differences and common feature. Fibrous filter layer. Particle efficiency of separation of single fibre and fibrous layer. Flow field around single fibre. Principles of particle separation. Pressure drop of fibrous layer (filter medium) and filter. Kinetics of filtration. Classification and use of filters for general ventilation. Clean rooms - definition, standardization, performance. HEPA and ULPA filters - classification and use. Industrial fabric filters, filter media, characteristic features, use.

Syllabus of tutorials:

Gaussian particle distribution. Log-normal particle distribution. Particle distribution Rosin - Rammler. Specific surface of particles. Aerodynamic drag force. Settling velocity for small and high Re. Particle stop distance. Mobility of the particle. Velocity of separation in centrifugal principle. Particle mean free path. Charge of particles and velocity of separation in electrical precipitators.

Velocity around the fibre. Comparison of different flow fields. Calculation of individual particle separation principles of single fibre. Overall grade efficiency of the single fibre and of the filter layer. Correction on non-homogenous fibre distribution. Pressure drop of the clean filter layer and pressure drop increase with dust loading.

Study Objective:

To get fundamental knowledge and skills in area of solid particles separation. To acquire context between surface, mobility, electrical and transfer particle properties and individual particle separation principles and particle separators. To get fundamental knowledge and skills in area of solid particle filtration in ventilation and air conditioning and in the industry. Knowledge of designing and dimensioning of filters for individual purposes.

Study materials:

Noel de Nevers: Air pollution control engineering, McGraw-Hill,Inc., 1995.

Brown R. C.: Air filtration, Pergamon Press, 1993

Flagan, R.C., Seinfeld, J.H.: Fundamentals of Air Pollution Engineering, Prentice Hall, 1988, ISBN 0-13-


· Hinds, W.C.: Aerosol Technology: Properties, Behaviour and Measurement of Airborne Particles, Wiley, 1999,

ISBN 0-471-19410-7

Time-table for winter semester 2020/2021:
Time-table is not available yet
Time-table for summer semester 2020/2021:
Time-table is not available yet
The course is a part of the following study plans:
Data valid to 2020-10-23
For updated information see http://bilakniha.cvut.cz/en/predmet5852006.html