Review on the NO removal from flue gas by oxidation methods

Meng, Shaoping; Shen, Boxiong; Adwek, George; Xiong, Lifu; Liu, Lijun; Yuan, Peng; Gao, Hongpei; Cai, Liang; Guo, Qihai

doi:10.1016/j.jes.2020.08.004

Cited by 72 publications

(37 citation statements)

References 150 publications

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“…ClO 2 and O 3 can operate at lower temperatures, 70-160 • C while maintaining efficiency [16,19]. H 2 O 2 and O 3 have an advantage compared to ClO 2 in that preferable reaction products are formed, H 2 O and O 2 , compared to the HCl formed from ClO 2 , but selectivity and reactivity with respect to NO to NO 2 oxidation is still below that of ClO 2 [20]. The high oxidation potential of O 3 has been shown to oxidize NO to higher oxidation states beyond NO 2 if the added O 3 exceeds a molar ratio with NO of 1.2 [21].…”

Section: Choice Of Oxidizing Agentmentioning

confidence: 99%

Techno-Economic Evaluation of Co-Removal of NOx and SOx Species from Flue Gases via Enhanced Oxidation of NO by ClO2—Case Studies of Implementation at a Pulp and Paper Mill, Waste-to-Heat Plant and a Cruise Ship

2021

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Co-absorption of NO2 and SO2 from flue gases, in combination with the enhanced oxidation of NO by ClO2(g), is studied for three different flue gas sources: a medium sized waste-to-heat plant; the kraft recovery boiler of a pulp and paper mill; and a cruise ship. Process modeling results are used to present the technical potential for each site together with cost estimation and optimization using a bottom-up approach. A process set-up is proposed for each site together with equipment sizing and resulting flows of process fluids. The simulation results, supported by experimental results, show that removal rates equal to or greater than current best available technologies are achievable with more than 90% of NOx and 99% of SO2 removed from the flue gas. The resulting cost of removing both NOx and SO2 from the flue gases is 2100 €/ton for the waste-to-heat plant, 800 €/ton for the cruise ship and 3900 €/ton for the recovery boiler. The cost estimation show that the consumption and cost of chemical additives will play a decisive role in the economic feasibility of the investigated concept, between 50% and 90% of the total cost per ton acid gas removed.

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Section: Choice Of Oxidizing Agentmentioning

confidence: 99%

Techno-Economic Evaluation of Co-Removal of NOx and SOx Species from Flue Gases via Enhanced Oxidation of NO by ClO2—Case Studies of Implementation at a Pulp and Paper Mill, Waste-to-Heat Plant and a Cruise Ship

2021

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Section: Nox Reduction Performances Of Ammonia Urea and Methanementioning

confidence: 99%

“…The NO x reduction efficiency equaled 80-85% for ammonia at an NSR of 1.5, 66-68% for urea at an NSR of 1.5, and 32-34% for methane at an NSR of 2. Moreover, the primary reactions affecting NO x reduction in the reactor during reducing agent injection were identified as reactions (1) and (2) for ammonia and urea and as reactions (3) and (4) for methane [29,30]: Methane exhibited a lower NOx reduction efficiency than ammonia and urea but generated a significantly smaller amount of N2O and offered the benefit of a lower (by ~80 °C) reaction temperature range. Considering that N2O is a potent greenhouse gas, it is The N 2 O levels generated using methane (18-21 ppm) were significantly lower than those generated using urea (157 ppm) and ammonia (51 ppm).…”

Section: No X Reduction Performances Of Ammonia Urea and Methanementioning

confidence: 99%

Reaction Characteristics of NOx and N2O in Selective Non-Catalytic Reduction Using Various Reducing Agents and Additives

Park

Dong

2021

Atmosphere

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Artificial nitrogen oxide (NOx) emissions due to the combustion of fossil fuels constitute more than 75% of the total NOx emissions. Given the continuous reinforcement of NOx emission standards worldwide, the development of environmentally and economically friendly NOx reduction techniques has attracted much attention. This study investigates the selective non-catalytic reduction (SNCR) of NOx by methane, ammonia, and urea in the presence of sodium carbonate and methanol and the concomitant generation of N2O. In addition, the SNCR mechanism is explored using a chemical modeling software (CHEMKIN III). Under optimal conditions, NOx reduction efficiencies of 80–85%, 66–68%, and 32–34% are achieved for ammonia, urea, and methane, respectively. The N2O levels generated using methane (18–21 ppm) were significantly lower than those generated using urea and ammonia. Addition of sodium carbonate and methanol increased the NOx reduction efficiency by methane to ≥40% and 60%, respectively. For the former, the N2O level and reaction temperature further decreased to 2–3 ppm and 850–900 °C, respectively. The experimental results were well consistent with simulations, and the minor discrepancies were attributed to microscopic variables. Thus, our work provides essential guidelines for selecting the best available NOx control technology.

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“…The design of the burner and its modes of operation largely determine the intensity of flame ignition, the conditions and rate of mixing of the fuel with the oxidizer and the maximum temperature level in the combustion core. By changing the design of the burner, it is possible to influence these parameters and, thereby, reduce the formation of NO X from 30 to 60% without worsening the combustion process at reduced capital and operating costs [23].…”

Section: Introductionmentioning

confidence: 99%

Applying the Random Forest Method to Improve Burner Efficiency

et al. 2022

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Fuel power plants are one of the main sources of pollutant emissions, so special attention should be paid to improving the efficiency of the fuel combustion process. The mathematical modeling of processes in the combustion chamber makes it possible to reliably predict and find the best dynamic characteristics of the operation of a power plant, in order to quantify the emission of harmful substances, as well as the environmental and technical and economic efficiency of various regime control actions and measures, and the use of new types of composite fuels. The main purpose of this article is to illustrate how machine learning methods can play an important role in modeling and predicting the performance and control of the combustion process. The paper proposes a mathematical model of an unsteady turbulent combustion process, presents a model of a combustion chamber with a combined burner, and performs a numerical study using the STAR-CCM+ multidisciplinary platform. The influence of various input indicators on the efficiency of burner devices, which is evaluated by several parameters at the output, is investigated. In this case, three possible states of the burners are assumed: optimal, satisfactory and unsatisfactory.

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Review on the NO removal from flue gas by oxidation methods

Cited by 72 publications

References 150 publications

Techno-Economic Evaluation of Co-Removal of NOx and SOx Species from Flue Gases via Enhanced Oxidation of NO by ClO2—Case Studies of Implementation at a Pulp and Paper Mill, Waste-to-Heat Plant and a Cruise Ship

Techno-Economic Evaluation of Co-Removal of NOx and SOx Species from Flue Gases via Enhanced Oxidation of NO by ClO2—Case Studies of Implementation at a Pulp and Paper Mill, Waste-to-Heat Plant and a Cruise Ship

Reaction Characteristics of NOx and N2O in Selective Non-Catalytic Reduction Using Various Reducing Agents and Additives

Applying the Random Forest Method to Improve Burner Efficiency

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