Advanced

Fly ash penetration through electrostatic precipitator and flue gas condenser in a 6 MW biomass fired boiler

Strand, Michael; Pagels, Joakim LU ; Wierzbicka, Aneta LU ; Gudmundsson, Anders LU ; Swietlicki, Erik LU ; Bohgard, Mats LU and Sanati, Mehri LU (2002) In Energy & Fuels 16(6). p.1499-1506
Abstract
The effects of an electrostatic precipitator and a flue gas condenser on size resolved fly ash particle concentration and composition were studied in a 6 MW biomass combustion unit, fired with moist forest residue. The boiler was of moving grate type. The fly ash particles were sampled upstream and downstream of the electrostatic precipitator and flue gas condenser, respectively. Fine particle number size distributions were measured using an electric mobility spectrometer (SMPS) and coarse particle number size distributions were measured using a time-of-flight instrument (APS). The mass size distributions were measured using a multi-jet low pressure cascade impactor (DLPI). For chemical analyses of the impactor substrates particle induced... (More)
The effects of an electrostatic precipitator and a flue gas condenser on size resolved fly ash particle concentration and composition were studied in a 6 MW biomass combustion unit, fired with moist forest residue. The boiler was of moving grate type. The fly ash particles were sampled upstream and downstream of the electrostatic precipitator and flue gas condenser, respectively. Fine particle number size distributions were measured using an electric mobility spectrometer (SMPS) and coarse particle number size distributions were measured using a time-of-flight instrument (APS). The mass size distributions were measured using a multi-jet low pressure cascade impactor (DLPI). For chemical analyses of the impactor substrates particle induced X-ray emission analysis (PIXE) was used. After the flue gas passed the electrostatic precipitator (ESP), the fly ash particle concentration was reduced by approximately 96% by number and 83% by mass. After the particles passed the flue gas condenser, particle number concentration was only marginally altered, whereas the mass concentration was reduced by half. Both the ESP and the condenser showed, size dependent particle separation efficiency. The main elements (Z > 12) in the fine fly ash fraction were K, S, and Cl, whereas the main elements in the coarse fraction were Ca, K, S, and Cl. After passing the ESP the mass ratio of Ca decreased in the coarse fraction, while the ratios of K, S, and Cl increased, indicating transference of fly ash material from the fine to the coarse particle fraction. There was no significant difference in the elemental composition for any particle size fraction sampled upstream or downstream of the condenser. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Energy & Fuels
volume
16
issue
6
pages
1499 - 1506
publisher
The American Chemical Society
external identifiers
  • wos:000179454700024
  • scopus:0036864791
ISSN
0887-0624
DOI
10.1021/ef020076b
language
English
LU publication?
yes
id
04d92da4-bce2-42d4-a155-f406e8182119 (old id 322851)
date added to LUP
2007-11-09 12:35:06
date last changed
2017-10-01 04:48:21
@article{04d92da4-bce2-42d4-a155-f406e8182119,
  abstract     = {The effects of an electrostatic precipitator and a flue gas condenser on size resolved fly ash particle concentration and composition were studied in a 6 MW biomass combustion unit, fired with moist forest residue. The boiler was of moving grate type. The fly ash particles were sampled upstream and downstream of the electrostatic precipitator and flue gas condenser, respectively. Fine particle number size distributions were measured using an electric mobility spectrometer (SMPS) and coarse particle number size distributions were measured using a time-of-flight instrument (APS). The mass size distributions were measured using a multi-jet low pressure cascade impactor (DLPI). For chemical analyses of the impactor substrates particle induced X-ray emission analysis (PIXE) was used. After the flue gas passed the electrostatic precipitator (ESP), the fly ash particle concentration was reduced by approximately 96% by number and 83% by mass. After the particles passed the flue gas condenser, particle number concentration was only marginally altered, whereas the mass concentration was reduced by half. Both the ESP and the condenser showed, size dependent particle separation efficiency. The main elements (Z > 12) in the fine fly ash fraction were K, S, and Cl, whereas the main elements in the coarse fraction were Ca, K, S, and Cl. After passing the ESP the mass ratio of Ca decreased in the coarse fraction, while the ratios of K, S, and Cl increased, indicating transference of fly ash material from the fine to the coarse particle fraction. There was no significant difference in the elemental composition for any particle size fraction sampled upstream or downstream of the condenser.},
  author       = {Strand, Michael and Pagels, Joakim and Wierzbicka, Aneta and Gudmundsson, Anders and Swietlicki, Erik and Bohgard, Mats and Sanati, Mehri},
  issn         = {0887-0624},
  language     = {eng},
  number       = {6},
  pages        = {1499--1506},
  publisher    = {The American Chemical Society},
  series       = {Energy & Fuels},
  title        = {Fly ash penetration through electrostatic precipitator and flue gas condenser in a 6 MW biomass fired boiler},
  url          = {http://dx.doi.org/10.1021/ef020076b},
  volume       = {16},
  year         = {2002},
}