Abstract
A mathematical model for an absorption of nitrogen oxides into water in packed column was developed based on the mass-transfer coefficient in packed column and the chemical reaction accompanying NO x absorption produces HNO3 and HNO2 in the liquid phase. The subsequent dissociation of HNO2 in the liquid-phase results in the formation of HNO3 and NO gas, and then this NO gas follows to be oxidized by O2 in air. The important factors influenced on the absorption of NO x are the oxidation state of NO gas and the partial pressure of nitrogen oxides in the gas. The efficiency of NO x absorption increases with the increase of the partial pressure of NO x . The most critical value for using the model is the constant of\(\left( {\sqrt {DK_{3/} H} } \right)_{N_2 O_4 } \).The selection of 11×10−4kg·mol/atm·m2·sec for\(\left( {\sqrt {DK_{3/} H} } \right)_{N_2 O_4 } \) resonable for this model.
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Abbreviations
- a:
-
gas-liquid interfacial area per unit volune [m2/m3]
- at :
-
total surface area of packing per unit volume [m−1]
- Cj :
-
liquid-phase concentration of component j [kg·mol/m3]
- C ij :
-
interfacial concentration of component j [kg·mol/m3]
- Dj :
-
diffusivity of component j [m2/s]
- DG :
-
diffusivity in the gas phase [m2/s]
- DL :
-
diffusivity in the liquid phase[m2/s]
- E:
-
enhancement factor [−]
- G:
-
gas flow rate [m3/s]
- G′:
-
superficial mass velocity of gas [kg/m2·s]
- L′:
-
superficial mass velocity of liquid [kg/m2·s]
- g:
-
gravitational constant [m2/s]
- Hj :
-
Henry’s law constant of component j [m3 atm/kg·mol]
- Ij :
-
local absorption rate of component j [kg·mol/m3·s]
- Kj :
-
reaction rate constant for reaction i [(kg·mol/m)1−n/s]
- kGj :
-
gas-phase mass-transfer coefficient for component j[kg·mol/m2atm·s]
- kL·j :
-
liquid-phase mass-transfer coefficient for component j [kg·mol/m2·atm·s]
- K P, 1 :
-
pressure equilibrium constant for reaction (1) [atm]
- L:
-
liquid flow rate [m3/s]
- NO2*:
-
NO2+2N2O4
- NOx :
-
NO+NO2*
- Pj :
-
partial pressure of gas compoent j [atm]
- R:
-
gas constant [m3·atm/kg·mol·K]
- T:
-
absolute temperature [K]
- V:
-
volume of column [m3]
- XN0 :
-
conversion fraction of NO [−]
- τ:
-
residence time [S]
- ΔV:
-
incremental column volume [m3]
- σc :
-
critical surface tension [kg/s]
- σL :
-
surface tension [kg/s]
- μG :
-
viscosity of gas [kg/m·s]
- τL :
-
viscosity of liquid [kg/m·s]
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Lee, H.K., Chun, K.S., Park, H.S. et al. Absorption of NO x in packed column (I). Korean J. Chem. Eng. 6, 294–299 (1989). https://doi.org/10.1007/BF02705217
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DOI: https://doi.org/10.1007/BF02705217