Oxy-combustion characteristics as a function of oxygen concentration and biomass co-firing ratio in a 0.1 MWth circulating fluidized bed combustion test-rig

Hoang Khoi Nguyen, Ji Hong Moon, Sung Ho Jo, Sung Jin Park, Myung Won Seo, Ho Won Ra, Sang Jun Yoon, Sung Min Yoon, Byungho Song, Uendo Lee, Chang Won Yang, Tae Young Mun, Jae Goo Lee

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Oxy-combustion with a circulating fluidized bed (Oxy-CFBC) can facilitate the separation of high CO2 concentration and reduce emissions by biomass co-firing. This study investigated Oxy-CFBC characteristics such as temperature, solid hold-up, flue gas concentrations including CO2, pollutant emissions (SO2, NO, and CO), combustion efficiency and ash properties (slagging, fouling index) with increasing input oxygen levels (21–29 vol%), and biomass co-firing ratios (50, 70, and 100 wt% with domestic wood pellet). The possibility of bio-energy carbon capture and storage for negative CO2 emission was also evaluated using a 0.1 MWth Oxy-CFBC test-rig. The results show that combustion stably achieved with at least 90 vol% CO2 in the flue gas. Compared to air-firing, oxy-firing (with 24 vol% oxygen) reduced pollutant emissions to 29.4% NO, 31.9% SO2 and 18.5% CO. Increasing the biomass co-firing from 50 to 100 wt% decreased the NO, SO2 and CO content from 19.2 mg/MJ to 16.1 mg/MJ, 92.8 mg/MJ to 25.0 mg/MJ, and 7.5 mg/MJ to 5.5 mg/MJ, respectively. In contrast to blends of sub-bituminous coal and lignite, negative CO2 emission (approximately −647 g/kWth) was predicted for oxy-combustion only biomass.

Original languageEnglish
Article number117020
JournalEnergy
Volume196
DOIs
StatePublished - 1 Apr 2020

Keywords

  • Biomass co-firing
  • CO
  • O concentration
  • Oxy-CFBC
  • Pollutant emissions

Fingerprint

Dive into the research topics of 'Oxy-combustion characteristics as a function of oxygen concentration and biomass co-firing ratio in a 0.1 MWth circulating fluidized bed combustion test-rig'. Together they form a unique fingerprint.

Cite this