A NUMERICAL ANALYSIS ON THE SUBMICRON- AND MICRON-SIZED PARTICLE SEDIMENTATION IN A WIRE-TO-PLATE ELECTROSTATIC PRECIPITATOR

Orçun Ekin

doi:10.17780/ksujes.1354863

TR EN

TELDEN-PLAKAYA TÜRDE BİR ELEKTROSTATİK ÇÖKTÜRÜCÜDE MİKRONALTI- VE MİKRON-BOYUTLU PARTİKÜL BİRİKİMİNİN NÜMERİK ANALİZİ

Öz

Elektrostatik çöktürücüler (ESP), küçük boyutlu organik ve inorganik maddelerin sürekli akışkan içerisinden elektriksel olarak yüklenmeleri suretiyle yüksek hassasiyetle ayrıştırılmalarında yararlanılan, yapılarında asgari hareketli aksam bulunduran cihazlardır. Bu çalışmada, deneysel verileri daha önce bir başka kaynakta yayınlanmış olan telden-plakaya tipteki elektrostatik çöktürücü sonlu elemanlar yöntemi ile 2 boyutlu kesit geometri olarak modellenmiş ve mikron- ve mikron-altı partiküllerin alansal ve difüzyon mekanizmaları ile elektriksel olarak yüklenmelerinin, ayrıca partikül çökelme davranışlarının detaylı elektrik alan özellikleri kapsamında incelenmesi amacıyla valide edilmiştir. Elektrik alan, gaz akışı ve partikül yörünge denklemleri bağlaşık hale getirilerek multifizik ortamında çözdürülmüştür. Partikül takibi Lagrange yaklaşımı ile modellenmiştir. Modelin sonuçları korona elektrotları arasında gerek elektrik alan kuvvetinde gerekse uzay yük yoğunluğunda kayda değer farklılıklar olduğunu ve uzay yükünün tüm çökelme kanalına yayıldığını ortaya koymaktadır. İki yüklenme mekanizmasından, difüzyon mekanizmasının mikron-altı partiküllerde oluşan yük birikiminde etkili iken alansal yüklenmenin daha ziyade 1μm’den daha büyük partiküllerde ön planda olmaktadır. Bununla birlikte, çalışma kapsamında dikkate alınmış olan ESP konfigürasyonunda partiküller 0.7 saniyeden kısa süre içerisinde elektriksel yük bakımından doygun hale gelmektedirler. Mikron boyutlu partiküllerin çökelme verimleri çapa bağlı olarak %100 mertebesine ulaşmakla birlikte mikron-altı partiküllerde artan partikül çapı ile difüzyon yüklenme mekanizması etkisini hızla kaybetmekte, dolayısıyla 50-250nm arasındaki partiküllerin çökelme verimlerinde önemli düşüş gözlenmektedir.

Anahtar Kelimeler

A NUMERICAL ANALYSIS ON THE SUBMICRON- AND MICRON-SIZED PARTICLE SEDIMENTATION IN A WIRE-TO-PLATE ELECTROSTATIC PRECIPITATOR

Abstract

Electrostatic precipitators (ESPs) are frequently utilized in collecting fine organic and inorganic materials from continuous liquid with few moving parts and high efficiency using electrically charging the particles. In this study, cross-sectional 2D geometry of a wire-to-plate electrostatic precipitator the parametric data of which originally published elsewhere was numerically modeled and validated to investigate submicron-micron particle charging in terms of diffusion and field charging mechanisms and precipitation behavior of particles with detailed electric field properties. Electric field, gas flow, and particle trajectory equations are coupled and solved in a multiphysics solver. Particle tracking is realized with the Lagrangian approach. Results indicate variations in electric field strength and space charge density between corona electrodes, with space charge present in the entire precipitation channel. Between two different charging mechanisms, diffusion charging prevails for charge accumulated on submicron particles, whereas field charging becomes dominant for particles larger than 1μm diameter. However, for the ESP configuration considered in this study, particles reach a charge saturation in less than 0.7 seconds, regardless of their size. Although calculated precipitation efficiencies for micron-sized particles can reach to 100%, efficiencies for submicron particle range drop with increasing particle size, as diffusion charging rapidly loses its effectiveness, in 50-250nm range.

Keywords

References

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Details

Primary Language

English

Subjects

Numerical Methods in Mechanical Engineering

Journal Section

Research Article

Authors

Orçun Ekin ^*
0000-0002-6779-885X
Türkiye

Publication Date

March 3, 2024

Submission Date

September 4, 2023

Acceptance Date

October 31, 2023

Published in Issue

Year 2024 Volume: 27 Number: 1

DOI

https://doi.org/10.17780/ksujes.1354863

IZ

https://izlik.org/JA65CE88AU

Cite

RIS / Bibtex

APA

Ekin, O. (2024). A NUMERICAL ANALYSIS ON THE SUBMICRON- AND MICRON-SIZED PARTICLE SEDIMENTATION IN A WIRE-TO-PLATE ELECTROSTATIC PRECIPITATOR. Kahramanmaraş Sütçü İmam Üniversitesi Mühendislik Bilimleri Dergisi, 27(1), 78-91. https://doi.org/10.17780/ksujes.1354863

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