Effects of slurry properties on simultaneous removal of SO2and NO by ammonia-Fe(II)EDTA absorption in sintering plants.
Simultaneous removal of SO2and NO by ammonia-Fe(II)EDTA absorption has become a research focus in recent years. In order to get useful data for further industrialization, in this work the practical operating conditions of the sintering plant were simulated in a pilot-scale reactor in order to explore the effects of slurry properties on simultaneous removal of SO2and NO. It was not conducive to the absorption of NO when (NH4)2SO4concentration and slurry temperature had been increased. The initial NO removal efficiency decreased from 90.63% to 44.12% as the (NH4)2SO4concentration increased from zero to 3.5 mol/L. With the increasing of Fe(II)EDTA concentration, SO32-concentration and pH value of absorption liquid and the absorption capacity of NO by Fe(II)EDTA solution increased. Especially the existence of SO32-ions in slurry had significantly improved the service life of chelating agents. The NO removal efficiency only decreased by 16.46% with the SO32-concentration of 0.3 mol/L after 30-min of operation. The chloride ions had no effects on the absorption of SO2and NO. The results indicated that changes of slurry properties had different effects on simultaneous removal of SO2and NO by ammonia-Fe(II)EDTA solution. The basic data offered by the experiments could effectively contribute to further industrial applications.
Hubei Key Laboratory of Coal Conversion and New Carbon Material, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China.
Qi
Q
Zhang
Hubei Key Laboratory of Coal Conversion and New Carbon Material, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China. Electronic address: shijie_wang@163.com.
Shijie
S
Wang
Hubei Key Laboratory of Coal Conversion and New Carbon Material, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China.
Gu
G
Zhang
Hubei Key Laboratory of Coal Conversion and New Carbon Material, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China.
Zhiyong
Z
Wang
Hubei Key Laboratory of Coal Conversion and New Carbon Material, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China.
Ping
P
Zhu
D000327:Adsorption; D000641:Ammonia / Q000737:chemistry; D004492:Edetic Acid / Q000737:chemistry; D004785:Environmental Pollutants / Q000302:isolation & purification*; D005740:Gases / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry; D008669:Metallurgy / Q000379:methods; D009569:Nitric Oxide / Q000737:chemistry / Q000302:isolation & purification*; D010084:Oxidation-Reduction; D012996:Solutions; D013458:Sulfur Dioxide / Q000737:chemistry / Q000302:isolation & purification*; D018505:Waste Management / Q000379:methods*
D004785:Environmental Pollutants; D005740:Gases; D012996:Solutions; D013458:Sulfur Dioxide; D009569:Nitric Oxide; D000641:Ammonia; D004492:Edetic Acid; D007501:Iron
Fe(II)EDTA; Pilot-scale reactor; Simultaneous removal of SO(2) and NO; Sintering flue gas; Slurry properties