The Chemical Coupling between Moist CO Oxidation and Gas-Phase Potassium Sulfation

Chanpirak, Arphaphon; Hashemi, Hamid; Frandsen, Flemming; Wu, Hao; Glarborg, Peter; Marshall, Paul

doi:10.2139/ssrn.4255546

Cited by 1 publication

(13 citation statements)

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“…The experimental results were interpreted in terms of the detailed chemical kinetic models of Berdugo Vilchez et al 62 and Chanpirak et al 61 In both mechanisms, the reaction SO 3 + 2H 2 O ⇌ H 2 SO 4 + H 2 O was added to describe decomposition of sulfuric acid. Modeling predictions were conducted using the temperature profile of the isothermal and cooling zones.…”

Section: Resultsmentioning

confidence: 99%

“…The flow reactor setup was established to supply submicrometer-sized substrates (aerosols) from an aqueous solution for examining homogeneous sulfation. The setup is described in detail elsewhere, 61 and only a brief description of the dosing unit, the experimental process, and the reactor size is given here. A total gas flow rate of 4 NL/min (298 K, 1 atm) was used in all experiments.…”

Section: Methodsmentioning

confidence: 99%

“…The generated aerosol droplets and gases were transported into the reactor via a tube, supplied by a stable and continuous flow. 61 The vaporization temperatures of the solution droplets were assumed to be close to the boiling point of pure water. The uncertainty in these values did not affect the interpretation of experiments, however; due to the high set point temperature of the reactor, complete evaporation in the preheating zone would be expected.…”

Section: Methodsmentioning

confidence: 99%

“…The modeling simulations shown in Figure 4 were conducted with the mechanisms of Berdugo Vilchez et al 62 and Chanpirak et al, 61 respectively, taking into account the isothermal zone and the cooling region. Because part of the KCl was in condensed form and thus unavailable for reaction below 1000 K, modeling predictions are only shown for experiments with set temperatures above 1000 K, and the preheating section was not considered in the calculations.…”

Section: Sulfation Of Kcl By H 2 Somentioning

confidence: 99%

“…Figure 8 shows the predicted concentrations of the major potassium and sulfur species in KCl sulfation with H 2 SO 4 for the conditions of set 1 and two different peak temperatures (1173 and 1473 K), based on the mechanism Chanpirak et al 61 In both cases, the first part (0−50 cm) corresponds to the isothermal zone, while the second part (50−60 cm) represents the cooling zone. At 1173 K, KCl is partly converted to KHSO 4 and K 2 SO 4 during the first 5−10 cm, approaching a partial equilibrium between the potassium species.…”

Section: Predicted Potassium and Sulfur Transformationsmentioning

confidence: 99%

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Sulfation of Gaseous KCl by H₂SO₄

Chanpirak

Jensen

et al. 2023

Energy Fuels

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The sulfation of gaseous KCl by H2SO4 in the presence of O2 and H2O was investigated in a laboratory laminar flow reactor at atmospheric pressure and temperatures ranging from 873 to 1523 K. The degree of sulfation was characterized by analysis of the elemental composition (Cl, S, and K) of the submicrometer particles captured on a filter downstream of the reactor. Furthermore, concentrations of HCl and SO2 in the outlet were measured. The experimental results were interpreted in terms of a detailed chemical kinetic model for the K/S/Cl chemistry. The degree of KCl sulfation depends on the reaction temperature and the reactant concentrations. The results show that H2SO4 is effective in sulfating KCl to K2SO4 at temperatures in the range 1073–1273 K, in particular at high H2SO4/KCl ratios. At temperatures of 1373 K and above, the sulfation efficiency decreases rapidly because alkali sulfate formation is no longer thermodynamically favored. The kinetic analysis shows that reaction is initiated by decomposition of sulfuric acid: H2SO4 + H2O ⇄ SO3 + H2O + H2O. Then KCl reacts directly with SO3 to form the intermediate KSO3Cl, which is further converted via KHSO4 to gaseous K2SO4. As the gas is cooled downstream of the isothermal zone, potassium sulfate nucleates homogeneously to form an aerosol, promoting further sulfation in the gas phase. The simulations are in satisfactory agreement with the experimental results, predicting correctly the temperature window for the process. However, the model overpredicts the SO2 yield at high temperature, indicating that the K/S interactions under these conditions are not fully understood. The results are important, both for validation of models of K/Cl/S interactions in combustion and for characterization of the sulfation of KCl by sulfuric acid to evaluate the potential of the sulfur recirculation process and identify the optimum process conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Sulfation Of Kcl By H 2 Somentioning

confidence: 99%

Section: Predicted Potassium and Sulfur Transformationsmentioning

confidence: 99%

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