Collection Efficiency of Various Filter Media in Diesel Exhaust

2001 ◽  
Author(s):  
M.S. Nikitidis ◽  
T. Manikas ◽  
D. Zarvalis ◽  
N. Divinis ◽  
C. Altiparmakis ◽  
...  
Keyword(s):  
Diesel Exhaust ◽  
Collection Efficiency ◽  
Filter Media

Experimental Study on the Reverse Cleaning and Regeneration of Diesel Engine's Metal Mesh Filter

2013 ◽  
Vol 416-417 ◽  
pp. 1834-1839
Author(s):  
Yao Wu Zhang
Keyword(s):  
Diesel Exhaust ◽  
Collection Efficiency ◽  
Wire Mesh ◽  
Fuel Oil ◽  
Bench Test ◽  
Power Performance ◽  
Regeneration System ◽  
Metal Mesh ◽  
Diesel Exhaust Particulate ◽  
Exhaust Particulate

This paper puts forward the suitable conditions of high sulphur fuel oil in China wire mesh particle trap counter blowing regeneration technology. The regeneration process is characterized by the filter body is separated from particle combustion, solve the problem of broken filter body and burning-out, at the same time remove the not burning material in the trap. By filtering body regeneration experiment made the counter blowing regeneration scheme, design and optimization of the diesel exhaust particulate trap wire mesh filter body and counter blowing regeneration system. Finally by engine bench test, test the diesel exhaust particulate after-treatment device influence on power performance and fuel economy of diesel engine, the jet pressure, jet time and scavenging time on back and collection efficiency effect.

Filter Media Design for High Purity Air Applications

1986 ◽  
Vol 29 (4) ◽  
pp. 27-31
Author(s):  
James Schaefer ◽  
Marty Barris ◽  
Benjamin Liu
Keyword(s):  
High Performance ◽  
Collection Efficiency ◽  
Particle Diameter ◽  
Particle Sizes ◽  
Filter Media ◽  
Media Design ◽  
Theoretical Predictions ◽  
Media Performance ◽  
Rating Criteria ◽  
Filtration Model

The design of high performance filter media for HEPA and ULPA applications is examined comparing theoretical predictions with experimental data. The analysis employs a hybrid filtration model. Pressure drop and particle collection efficiency in the region of minimum efficiency where particle diffusion is decreasing and particle interception is increasing as the particle size increases are examined as functions of particle diameter, velocity, and media geometry including fiber diameter, solidity, and thickness. Several grades of filter media are characterized and tested for particle sizes in the region of the point of minimum efficiency at typical media rating and application velocities. Filter media performance comparisons are made that show how the point of minimum efficiency can be altered by velocity and media geometry changes. This information is used for a discussion of HEPA and ULPA media performance rating criteria with respect to test and application conditions. Based upon the results of this study, filter media design, analysis, evaluation and application tools are presented for optimizing high performance filter media for HEPA applications, with suggested future trends based upon projected needs for improving the performance of HEPA media.

scholarly journals Development of Filter Media by Electrospinning for Air Filtration of Nanoparticles from PET Bottles

Membranes ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 293
Author(s):  
Daniela P. F. Bonfim ◽  
Fabiana G. S. Cruz ◽  
Vádila G. Guerra ◽  
Mônica L. Aguiar
Keyword(s):  
Collection Efficiency ◽  
Fine Particulate Matter ◽  
Electrospinning Process ◽  
Air Filtration ◽  
Filter Media ◽  
Gas Filtration ◽  
Pressure Drops ◽  
Support Materials ◽  
Pet Bottles ◽  
Needle Diameter

Air pollution and solid pollution are considered global problems, and endanger human health mainly due to the emission of fine particulate matter released into the atmosphere and improper disposal of post-consumer plastic bottles. Therefore, it is urgent to develop filter media to effectively protect the public. The properties of plastics make them potential candidates for nanofiber mat formers due to their attractive structural and mechanical characteristics. This work aims to produce and evaluate novel PET electrospun fibers dispensed with the use of support materials to be used as filter media to remove nanoparticles from the air. The electrospinning process was carried out by changing the concentration of the polymer solution, the needle diameter, and the electrospinning processing time at two rotation speeds. The average diameters of the micro- and nanofibers of the filter media produced ranged from 3.25 μm to 0.65 μm and it was possible to conclude that, as the size of the fibers decreased, the mechanical strength increased from 3.2 to 4.5 MPa. In filtration tests, a collection efficiency of up to 99% with low-pressure drops (19.4 Pa) was obtained for nanoparticles, demonstrating high quality factor filter media, which could be applicable in gas filtration.

To What Extent are Inelastically Scattered Electrons Useful in the Stem?

1973 ◽  
Vol 31 ◽  
pp. 286-287 ◽  
Author(s):  
H. Rose
Keyword(s):  
Electron Microscope ◽  
High Resolution ◽  
Electron Correlation ◽  
Quantum Noise ◽  
Collection Efficiency ◽  
Scanning Transmission Electron Microscope ◽  
Electron Cloud ◽  
Scanning Time ◽  
Transmission Electron ◽  
Scanning Transmission

The scanning transmission electron microscope offers the possibility of utilizing inelastically scattered electrons. Use of these electrons in addition to the elastically scattered electrons should reduce the scanning time (dose) Which is necessary to keep the quantum noise below a certain level. Hence it should lower the radiation damage. For high resolution, Where the collection efficiency of elastically scattered electrons is small, the use of Inelastically scattered electrons should become more and more favorable because they can all be detected by means of a spectrometer. Unfortunately, the Inelastic scattering Is a non-localized interaction due to the electron-electron correlation, occurring predominantly at the circumference of the atomic electron cloud.

Sign in / Sign up

Export Citation Format

Share Document