Open AccessResearch on removal of NOX, SO2 and PM from flue gas of coal-fired boilers and engineering application
Author(s) -
Z. Tang,
Zhou Ru-lu,
DongFeng Cui,
Yang Jiang,
Stefan Ma,
Ran Wei
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/510/4/042023
Subject(s) - flue gas , nox , chemistry , ozone , molar ratio , analytical chemistry (journal) , nuclear chemistry , absorption (acoustics) , materials science , environmental chemistry , catalysis , organic chemistry , combustion , composite material
Removal of NO X and SO 2 from flue gas by Ozone (O 3 ) oxidation and NaOH absorption was carried out in practical engineering. The effects of the liquid to gas ratio (L/G), the molar ratio of O 3 dosage and initial content of NO X (O 3 /NO X ), pH and NaOH concentrations on the removal efficiencies of NOx and SO 2 were investigated. In addition, the influences of O 3 /NO X and voltage on the removal of PM were analyzed. The results show that the NO X removal efficiency increases with the increasing of O 3 /NO X (0∼2.0), solution pH (4∼7) and L/G (2∼8), while is slightly affected by NaOH concentration (0.05∼1%). The SO 2 removal efficiency increases with the increase of L/G from 2 to 8 L/Nm 3 , but is hardly changed by O 3 /NO X (0∼2.0), NaOH concentration (0.05∼1%) and solution pH (4∼10). It was found that the outlet concentration of PM (C PM ) decreased with the rise of voltage ranging from 0 to 40 kV, however, slightly increases with the increment of O 3 /NO X at a range from 1.6 to 2.0. The optimal operating conditions can be established when taking running costs and rigorous ultra-low emission standards into consideration. Under the optimal conditions, the removal efficiencies of NO X and SO 2 reached more than 75% and 98% respectively, and C PM could be also controlled within 5 mg/Nm 3 .