Homogeneous and heterogeneous radiation induced NO and SO2 removal from power plants flue gases—modeling study

Kinetic Mechanisms of Electron-Beam Induced Polycyclic Aromatic Hydrocarbons Transformation in Flue Gases

“…There are many types of kinetic models that consider EB-induced gas-phase chemical reactions leading to conversion of SO 2 and NO into corresponding acids [13][14][15][16][17][18]. As a base for the present modeling study of EB-induced PAHs transformation in the industrial flue gases, it was chosen the previously developed optimal kinetic model of gas-phase SO 2 and NO oxidation [15] that consists of 34 gas-phase chemical reactions and 31 gas components (see Table 1).…”

“…As a base for the present modeling study of EB-induced PAHs transformation in the industrial flue gases, it was chosen the previously developed optimal kinetic model of gas-phase SO 2 and NO oxidation [15] that consists of 34 gas-phase chemical reactions and 31 gas components (see Table 1). The main groups of reactions represented in the Table 1 include charge transfer reactions 1-5 that lead to formation of comparable stable ions H 3 O ?…”

“…As the concentration of sulfuric acid in the gas is much lower than that of water vapor and Henry's Law constant for H 2 SO 4 is very high, it may be assumed that the whole amount of sulfuric acid transfers into solution and a change in the partial vapor pressure of water can be neglected. The volume condensation in the H 2 O-H 2 SO 4 system with formation of small droplets as applied to EBDS-process conditions was considered in [15]. Numerical estimations of the condensation process showed that formation of liquid phase is fast in comparison with gas-phase H 2 SO 4 generation.…”

Simulation of the formation and degradation of polycyclic aromatic compounds under the action of ionizing radiation

“…The kinetic model of the gas-phase conversion of sulfur oxides and nitrogen oxides is based on an optimum mechanism of this group of reactions, which was developed previously [10]. The model includes ion-molecule charge-exchange reactions, ion-molecule reactions, the formation of negative molecular ions, the recombination of positive ions with electrons and negative molecular ions, and a set of reactions between neutral components of the system.…”

“…At high temperatures ( T > 400 K), hydrogen abstraction and the formation of an A i • radical, which subsequently participates in reaction sequence (2), take place: OH + A i A i • + H 2 O. A simplified kinetic model for the formation and degradation of aromatic molecules in the temperature range under consideration was constructed based on an analysis of detailed kinetic models [6,9,[12][13][14] and a choice of principal steps in accordance with the procedure discussed previously [10]. The table summarizes a version of the model obtained as a result of excluding reactions from the full kinetic model with a 20% threshold of sensitivity for the concentration of C 6 H 6 over the region of integration over absorbed dose from zero to 20 kGy at a reaction temperature of T = 400-600 K. The reaction rate constants given were adapted to thermodynamic equilibrium conditions relevant to the Maxwell-Boltzmann distribution of gas particles over the degrees of freedom.…”