Open AccessFormation characteristics of ultra fine particles during oxy-coal combustion with flue gas recirculation
Author(s) -
Yongjun Xia,
Chen Linguo,
Jun Wang,
Ruixian Cai,
Zhiyong Tan
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/295/5/052019
Subject(s) - combustion , flue gas , coal , bituminous coal , coal combustion products , materials science , bottom ash , waste management , chemical engineering , fly ash , ultrafine particle , metallurgy , mineralogy , chemistry , composite material , nanotechnology , engineering , organic chemistry
A laboratory-scale oxy-fuel combustion experimental apparatus was built up to simulate the real oxy-fuel combustion. Under conditions with three kinds of recycles (no-RFG, de-ash and ash), combustion experiments of DT bituminous coal (rich in Si and Al) and SH bituminous coal (rich in Ca) were conducted to investigate the influence of recycled ash on formation of ultrafine particle matters. The results show that, compared with the no-RFG condition, under condition with de-ash flue gas recycle, the yields of ultrafine particle matters of the DT and SH coal were both basically invariant, while that under condition with ash recycle decreased by about 12.03% (DT coal) and 7.73% (SH coal), respectively. Under condition with ash recycle, the silicon aluminate, which was rich in the ash of DT coal, would absorb the Na and K vapor released during the combustion, and the rich CaO in the SH coal may also absorb the S element during the combustion to restrain the S from migrating to the ultrafine particles, both of the reactions decreased the formation of the ultrafine particles.