Removal of sulfur dioxide from diesel exhaust gases by using dry desulfurization MnO2 filter

Spray towers allow for controlling air pollution in which a liquid is sprayed in small droplets to produce a large interfacial area for mass transfer between a gas and a liquid phase. An experimental study of a spray tower for removing SO2 is described. The experiments were carried out under different operating conditions by varying the gas velocity, liquid flow rate, and SO2 concentration. SO2 removal efficiency, volumetric mass transfer coefficient, and liquid‐film formation as a result of the collision of droplets against the tower wall are investigated. Removal efficiency and volumetric mass transfer coefficient are analyzed as a function of gas velocity, liquid flow rate, and SO2 concentration, while liquid‐film formation is evaluated as a function of tower height. The results indicate high removal efficiency. Correlations to predict the volumetric mass transfer coefficient are also proposed.

Section: Introductionmentioning

confidence: 99%

Mass Transfer and Liquid‐Film Formation in a Spray Tower for SO₂ Removal in Sodium Hydroxide Solution

Codolo

Bizzo

2016

“…The relationship between the solid conversion (X) and the reaction time (t) for estimating the sulfate rate constants could be derived from Eqs. (5) and (6) as follows:…”

Section: So 2 Capture Rate Constant Estimation By the Grain Modelmentioning

confidence: 99%

“…However, the wet FGD methods require large amounts of water and further treatment of the by-products [4]. The dry desulfurization filter device with low operating costs and less water has been proposed for removing SO 2 from diesel exhaust [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Enhanced SO₂ Capture Performance of MnO₂ by Doping with Alkali Metal Ions for Diesel Emission Control

Liu

Chen

2018

Growing concern about sulfur dioxide (SO2) emission from diesel exhaust causing a serious threat to the environment and human health necessitated enhanced desulfurization materials for dry desulfurization filters. MnO2 was modified with various alkali metal ions by impregnation to strengthen its SO2 capture capacity. The prepared materials were characterized by various technologies. Their SO2 capture capacities were measured by thermogravimetry, and the sulfate reaction mechanism was also evaluated. The results confirm that the SO2 capture performance of MnO2 could be significantly enhanced by doping with alkali metals. The prepared Li‐doped MnO2 has good SO2 trap capacity with improved absorbance being 64 % higher than that of MnO2. The grain model can be applied to explain the sulfate reaction mechanism between Li‐doped MnO2 and SO2. The activation energy was calculated by the grain model equations.

“…Nowadays, high amounts of poisonous gases, such as sulfur dioxide (SO 2 ) and others, mainly generated from coal and fossil oil combustion, contribute to regional acid rain pollution and urban photochemical smog, which further causes chronic hazards for human health and the destruction of the ecological environment balance . Typically, China is one of the few countries in the world where more than 70 % of the country's total energy sources are supplied by coal combustion.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Flue Gas Desulfurization Using Different‐Grade Natural Manganese Oxides

Chen

et al. 2020

Different grades of natural manganese ores were used to remove SO 2 by dry flue gas desulfurization. The grades of the manganese ores were negatively correlated with the desulfurization performance. The produced MnSO 4 enriched on the surface would block the gas diffusion channels during desulfurization. The better desulfurization properties of the low-grade manganese ores are ascribed to the highly active g-MnO 2 , the porous structure, and the high specific surface area as well as the SiO 2 bridge-like effects. This study supports the cooperative use of sulfur-containing flue gases and low-grade natural manganese oxides.