Particle size distribution and enrichment of selected metals from waste sludge combustion at air and oxy-fuel combustion

Ha Na Jang, Jin Ho Sung, Seung Ki Back, Hang Seok Choi, Yong Chil Seo

Research output: Contribution to conferencePaper

Abstract

Comparative tests in air and oxy-fuel combustion with oxygen injection rates ranging from 21% to 40% were conducted in a 30kWth circulating fluidized bed (CFB) pilot plant for waste sludge combustion. General combustion characteristics of the CFB such as pressure profiles, temperatures along the bed, and flue-gas composition, were different under the air and oxy-fuel conditions with various oxygen injection rates. Based on the results, the optimal oxygen injection rate was determined as 25% for the oxy-fuel combustion. In the bottom and fly ash, alkali and heavy metals had different distribution under the air and oxy-fuel combustion conditions. The particle size distribution in fly ash from air combustion was dominated by coarse particles over 2.5 |im in size, whereas with oxy-fuel combustion, most particles were submicron in size approximately 0.1 μm, and a smaller amount of coarse particles over 2.5 pμm in size formed than with air combustion. Mass fractions of Al, Ca, and K below 2.5 p.m in size found in the ashes from oxy-fuel combustion were higher than those in air combustion were. Submicron particle formation from the Cr, Ni, Cu, and Zn in the fly ash occurred more during oxy-fuel combustion than it did in air combustion.

Original languageEnglish
Pages517-523
Number of pages7
Publication statusPublished - 2017 Jan 1
Event12th International Conference on Fluidized Bed Technology, CFB 2017 - Krakow, Poland
Duration: 2017 May 232017 May 26

Other

Other12th International Conference on Fluidized Bed Technology, CFB 2017
CountryPoland
CityKrakow
Period17/5/2317/5/26

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Filtration and Separation
  • Fluid Flow and Transfer Processes
  • Energy Engineering and Power Technology

Cite this

Jang, H. N., Sung, J. H., Back, S. K., Choi, H. S., & Seo, Y. C. (2017). Particle size distribution and enrichment of selected metals from waste sludge combustion at air and oxy-fuel combustion. 517-523. Paper presented at 12th International Conference on Fluidized Bed Technology, CFB 2017, Krakow, Poland.