Back to Search
Start Over
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
- Source :
- Energy. 196:117020
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
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.
- Subjects :
- Flue gas
020209 energy
Biomass
02 engineering and technology
Combustion
Industrial and Manufacturing Engineering
chemistry.chemical_compound
020401 chemical engineering
0202 electrical engineering, electronic engineering, information engineering
Coal
Fluidized bed combustion
0204 chemical engineering
Electrical and Electronic Engineering
Sulfur dioxide
Civil and Structural Engineering
business.industry
Mechanical Engineering
Building and Construction
Pulp and paper industry
Pollution
General Energy
chemistry
Carbon dioxide
Environmental science
Limiting oxygen concentration
business
Subjects
Details
- ISSN :
- 03605442
- Volume :
- 196
- Database :
- OpenAIRE
- Journal :
- Energy
- Accession number :
- edsair.doi...........8191dca5d8d440b6c3d33b5091f61e4a