Filtration and regeneration behavior of polytetrafluoroethylene membrane for dusty gas treatment

Abstract

With micron talcum particles and nano-CaCO 3 powder as test dust, a series of experiments have been carried out to systematically study the gas filtration and regeneration behavior of polytetrafluoroethylene membrane, and some comparisons were made with common filter media. The experimental results showed that the PTFE membrane had a filtration efficiency of above 99.99% for micron particles, and excellent regeneration behavior was obtained, though a much higher initial pressure drop existed. Based on the results, it was concluded that the PTFE membrane is an excellent surface-filtration media for micron particles. Effects of operation parameters, including airflow velocity, particle concentration and particle characteristics were also investigated. To better understand the evolution of pressure drop during the filtration process, a mathematical model with operation parameters and characteristics of particles was derived from the gas-solid two-phase flow theories. A novel method on the determination of regeneration period of the filter media was put forward based on the analysis of the pressure drop according to this model.

Influencing factors on low-temperature deNOx performance of Mn–La–Ce–Ni–Ox/PPS catalytic filters applied for cement kiln

“…1(e) showed the Mn-La-Ce-Ni-O x /PPS after spraying PTFE emulsion and the PPS fibers which attaching catalyst powder has been coated by PTFE emulsion. The PTFE coating can not only improve the filter material resistance to chemical corrosion and ash removal performance but also prolong the life of fiber [6][7][8], fix catalyst particles and also make them more secure attachment.…”

Manufacturing of polytetrafluoroethylene fine fibers by waterjet impacting

“…These bers were used to purify dust from municipal solid waste incineration. [1][2][3][4][5] Current industrial lters use high-performance nonwoven fabrics manufactured by the needle punching technology. 6,7 Once industrial dust gets inside the lters, entangled bers in the nonwoven material capture and intercept micrometer-sized solid particles, achieving dust purication.…”

Effects of Surface Finish of Nonwoven Fabric Bag Filters on Filter Efficiency

“…The aim of Tomonori Fukasawa 1 Chikao Kanaoka 2 Toru Ishigami 1 Kunihiro Fukui 1, * -1 Dr. Tomonori Fukasawa, Dr. Toru Ishigami, Dr. Kunihiro Fukui kfukui@hiroshima-u.ac.jp Hiroshima University, Graduate School of Advanced Science and Engineering, 1-4-1 Kagamiyama, Higashi-hiroshima, Hiroshima, 739-8527, Japan. these surface finishes is to improve the dust removal efficiency during cleaning, increase the filtration efficiency after the removal of the dust cake, and limit the penetration of dust particles into the internal structure of the filter [16,[22][23][24][25]. However, studies on the effect of these surface finishes on filter performance are insufficient.…”