Aerosol & Particulate Research Lab109/22/2008 Fabric Filters Filtration Fabric Selection Fabric Cleaning Air/Cloth Ratio, Filtration Velocity Pressure.

Slides:

Advertisements

Similar presentations

Advertisements

Motion of particles trough fluids part 2

3. The Motion of Particles Drag force d particle diameter V flow velocity Spherical particle, Re < 1 Drag coefficient A projected area.

(IAQ). Introduction  A collective group of fine solid particles, aerosols, mist, smoke, dust, fibers and fumes are called Respirable particles  Particles.

Coupling a Network HVAC Model to a Computational Fluid Dynamics Model Using Large Eddy Simulation Jason Floyd Hughes Associates, Inc Fire + Evacuation.

Dust Collectors Baghouses and Cartridge Collectors.

FABRIC FILTER BAGS. Content Filter media for dedusting Fibers & Technologies Type of Bags Needle Felts Woven Fabrics Comparison between Needle Felt &

5. Filtration Fibrous filter High-efficiency glass fiber filter (a) 4150x (b) 800x. - Porosity: 70 to >99%. - Fiber size:

اسکرابرهای تر اساس کار این روش شستشوی گاز به کمک یک حلال می باشد.

Lecture Objectives -Finish with modeling of PM -Discuss -Advance discretization -Specific class of problems -Discuss the CFD software.

Motion of particles trough fluids part 2

Particulate Control-2 Fabric Filters Particulate Scrubbers Lecture notes adapted from Prof. Dr. Dentel Notes and Prof. Dr. Chang-Yu Wu.

NARAGHI HALL 3 rd FLOOR VENTILATION MANAGEMENT IMPROVEMENT BEST PRACTICE AWARD HVAC DESIGN/RETROFIT 2014 CALIFORNIA HIGHER EDUCATION SUSTAINABILITY CONFERENCE.

Module 2 Particles. MCEN 4131/ What are we doing in class today? Preliminaries –Grad students HW 2 add 3.17 and 5.16 –Assignment for Thurs find.

Cyclones & Electrostatic Precipitators

Baghouse Filters & Scrubbers

Air Pollution Control – Design Considerations: General Objectives: Background for equipment design To be conversant with equipment manufacturers Understand.

Particle Control Technologies

NAFA Technical Seminar April 19, 2012 ANSI/ASHRAE 52.2 Can we fix this Method of Test?

Sterilization (continued)

CLEAN AIR NANOSOLUTIONS. Actual situation Air pollution due to industry: PM10 – indicator for evaluation of acute impact on health PM2,5 – indicator for.

Basic Laws of Gases and Particulates

Copyright National Air Filtration Association 2006 Rev. 2 Clean Spaces.

Polymer Nanofibers from Recycling of Waste Expanded Polystyrene Research at The University Of Akron C. Shin and G. G. Chase Polymer Nanofibers from Recycling.

Houston Material Handling Society October 2008 Baghouse Cleaning Control Presented by: T.J. Winalski.

Fluid Resistance.

Particulate control techniques Gravity settling chamber Mechanical collectors Particulate wet scrubbers Electrostatic precipitators Fabric filters.

Properties of Fluids 16-2.

The Coudé Lab Environment Boulder 18 March The Coudé Lab.

Lecture Objectives -Finish with age of air modeling -Introduce particle dynamics modeling -Analyze some examples related to natural ventilation.

Formative Assessment. 1. Water flows at m/s down a pipe with an inner diameter of 1.27 cm. If the pipe widens to an inner diameter of 5.08 cm, what.

NAFA Guide To Air Filtration Chapter 2 Principles of Air Flow, Air Pressure And Air Filtration presented by the National Air Filtration Association Fourth.

A proposal of ion and aerosol vertical gradient measurement (as an example of application of the heat transfer equations) H. Tammet Pühajärve 2008.

Chapter 8. FILTRATION PART II. Filtration variables, filtration mechanisms.

Introduction to Energy Management. Week/Lesson 8 Air Cleaning Equipment.

V3 vs. v4 New Protocols for LEED Tommy Linstroth, Principal.

Particulate Control-2 Fabric Filters Particulate Scrubbers

2016/1/261 Aerosol & Particulate Research Lab Thermal & Radiometric Forces Thermophoresis: Particle motion in a temperature gradient, from a hotter to.

Cyclones Applications for cyclones Efficiency of cyclones Estimating costs of cyclones Fisher Klosterman, Inc Hannigan, Inc.

Electrostatic Precipitators (ESPs)

Aerosol & Particulate Research Lab

Objectives Finish heat exchangers Air Distribution Systems

APPLICATIONS OF ELECTROSPINNING Part 1: Air filtration

FLOW IN FLUIDIZED BEDS Fluidization refers to those gas-solids and liquid-solids system in which the solid phase is subjected to behave more or less like.

Welcome to the Amrit Filtration Equipments

Basics of Seed Conditioning

Adsorption 2018/7/1.

Sustainability and Life Cycle Costing of Air Filtration

ANSI/ASHRAE 52.2 A destructive test to measure minimum efficiency reporting value (MERV) Efficiency test aerosol is Potassium Chloride (KCl) particles,

Filter Installation Leak Testing

Polymer Nanofibers from Recycling of Waste Expanded Polystyrene

Lecture Objectives Learn about particle dynamics modeling

Filtration Reading Materials:

Comparison between Serrated & Notched Serrated Heat Exchanger Fin Performance Presented by NABILA RUBAIYA.

Effect of gravity on coalescence

Homework #5 1. a) What are the EPA standards dealing with air quality in terms of particulate matter? b) How are they being revised? c) Give the rationale.

ENG421 (7c) – Coagulation and Flocculation

Mechanical Separation

Developing relationship between ACFM vs SCFM for HEPA Filters

Fixed bed Filled with particles Usually not spherical

Electret, What Are The Important Parameters That Need To Be Considered

Mathematics of Air Filtration

Chapter 6 Cyclones.

Property of National Air Filtration Association

Nafa Tech Seminar Phoenix Arizona 2004

Chapter 7 Fabric Filters.

Volume 19, Pages (September 2019)

Presentation transcript:

Aerosol & Particulate Research Lab109/22/2008 Fabric Filters Filtration Fabric Selection Fabric Cleaning Air/Cloth Ratio, Filtration Velocity Pressure Drop and Design Consideration Nanofiber Filter Filtration Mechanisms Reading: Chap. 6

Aerosol & Particulate Research Lab209/22/2008 Types of Filter Fibrous filter Felted filter

Aerosol & Particulate Research Lab309/22/2008 Types of Filter Packing density/solidity For fiber filter,  < 0.1 For woven filter,  ~ 0.3 Do filters function simply as sieves (to collect particles larger than the sieve spacing)?

Aerosol & Particulate Research Lab409/22/2008 Theodore & Buonicore, Air Pollution Control Equipment, CRC Press, 1988.

Aerosol & Particulate Research Lab509/22/2008 Shaker Baghouse Theodore & Buonicore, Air Pollution Control Equipment, CRC Press, Shaker Cleaning Parameters What are the common problems encountered?

Aerosol & Particulate Research Lab609/22/2008 Reverse-Air

Aerosol & Particulate Research Lab709/22/2008 Reverse-Air Cleaning Parameters Cleaning dust on baghouse walls by traditional sledge-hammering Pros and Cons?

Aerosol & Particulate Research Lab809/22/2008 Pulse-Jet How can the blown-away particles by the on-line cleaning process be collected? Felted fabric or woven fabric?

Aerosol & Particulate Research Lab909/22/2008 Air/Cloth Ratio Filtration velocity (average velocity) If thicker fabric is needed to sustain the high force, is its operating cost higher?

Aerosol & Particulate Research Lab1009/22/2008 Parallel Flow Operation How do you determine when to clean?

Aerosol & Particulate Research Lab1109/22/2008 Pressure Drop (Filter Drag Model) Areal Dust Density Filter drag K2K2 K1K1 K 1 & K 2 to be determined empirically (resistance factor)  P f : fabric pressure drop  P f : particle layer pressure drop  P s : structure pressure drop Time (min)  P, Pa What is the pressure drop after 100 minutes of operation? L = 5 g/m 3 and V = 0.9 m/min.

Aerosol & Particulate Research Lab1209/22/2008 trtr tctc tftf tjtj Time Pressure pmpm Time to clean Flow rate Filtering velocity What are the parameters that affect our decision on the number of compartments to be used?

Aerosol & Particulate Research Lab1309/22/2008 Areal dust density Filter drag Actual filtering velocity Pressure drop

Aerosol & Particulate Research Lab1409/22/2008 Ex. Calculate the max pressure drop that must be supplied for the following baghouse for a filtration time of 60 minutes: K 1 = 1 inch H 2 O-min/ft, K 2 = inch H 2 O- min-ft/grain, t c = 4 min, 5 compartments, L = 10 grain/ft 3, Q = ft 3 /min, A c = 4000 ft 2 /compartment. Nanofiber Filter Nano-alumina on microglass Argonide E-spun PAN nanofiber Dr. Wolfgang Sigmund, MSE. UF

Aerosol & Particulate Research Lab1509/22/2008 Filtration Mechanisms Diffusion (Lee & Liu, 1982) Lee, K.W. & Liu, B.Y.H., Aerosol Sci. Technol., 1:47-61, How does efficiency change wrt d p ? How to increase efficiency by diffusion?

Aerosol & Particulate Research Lab1609/22/2008 Impaction (Yeh & Liu, 1974) Yeh. H.C. & Liu, B.Y.H., J. Aerosol Sci., 5: , 1974 (J = 2 for R > 0.4) How to increase impaction efficiency? How does efficiency change wrt dp?

Aerosol & Particulate Research Lab1709/22/2008 Interception (Krish & Stechkina, 1978) Krish, A. A. & Stechkina, I. B., “The theory of Aerosol Filtration with Fibrous Filters”, in Fundamentals of Aerosol Science, Ed. Shaw, D. T., Wiley, Fat Man’s Misery, Mammoth Cave NP How to increase interception efficiency?

Aerosol & Particulate Research Lab1809/22/2008 Gravitational Settling Total Single Fiber Efficiency Total Filter Efficiency S f : Solidarity factor How does the filter efficiency change wrt particle size?

Aerosol & Particulate Research Lab1909/22/2008 H = 1mm  = 0.05 d f = 2  m U 0 =10 cm/s Should we increase or decrease flow velocity in order to increase collection efficiency for (a) tobacco smoke, (b) cement dust?

Aerosol & Particulate Research Lab2009/22/2008 Minimum Efficiency Reporting Value (MERV) for HVAC (Heating, Ventilating and Air Conditioning) Filters DF/Merv_Rating_Chart.pdf

Aerosol & Particulate Research Lab2109/22/2008 Quick Reflection