Pilot-scale experiment and simulation optimization of dual-loop wet flue gas desulfurization spray scrubbers

Qin, Mingchen; Dong, Yong; Cui, Lin; Yao, Junwen; Ma, Chunyuan

doi:10.1016/j.cherd.2019.06.011

Cited by 31 publications

(11 citation statements)

References 34 publications

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“…The mass transfer process between the gas and liquid phases is influenced by the partial pressures of both phases. Following the dual-mode theory, the mass transfer rates of SO 2 and NO can be expressed by eq . ,,,, Considering gravity and resistance as two key forces in a two-phase flow, the momentum source term, which refers to Crowe’s formulation in eq , can be expressed as eq . , Here, C d is the drag coefficient, which depends on the Reynolds number of the liquid droplets and is calculated using the correlation established by Morsi and Alexander . The mass and heat transfer processes of SO 2 and NO in the liquid phase were coupled by using UDF codes.…”

Section: Mathematical Methodsmentioning

confidence: 99%

Simulation of a Multistaggered Baffle Scrubber to Enhance the Efficiency of Simultaneous Desulfurization and Denitrification

Zeng,

Lee,

Kim

et al. 2024

ACS Omega

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In this study, we conduct simulation research on simultaneous desulfurization and denitrification in a multistaggered baffle spray scrubber. By employing two-phase flow simulations within the Euler–Lagrange framework and calculating the gas–liquid mass transfer rate with user-defined functions, we comprehensively analyzed the effects of various operational parameters. Initially, we validated our simulation model by comparing the simulation results with experimental data. Under conditions of a 0.2 mm droplet diameter, a liquid-to-gas ratio (L/G) of 12 L/m3, and a gas flow rate of 5 CMM using a full cone nozzle, the simulation indicated a desulfurization efficiency of 99.90 versus 99.84% obtained experimentally and a denitrification efficiency of 92.01 versus 90.67% obtained experimentally. This comparison confirmed the reliability of the simulation model. Our findings indicate that a droplet size of 2 mm is optimal, enhancing the desulfurization efficiency from 99.90 to 99.98% and the denitrification efficiency from 92.01 to 99.76%. However, when the droplet size exceeds 2 mm, efficiencies marginally decrease. Increasing the liquid-to-gas ratio to 16 L/m3 further improves desulfurization and denitrification efficiencies to 99.98 and 99.80%, respectively. In contrast, higher inlet flue gas flow rates reduce these efficiencies, with a decline observed from 100% to as low as 93.90% for denitrification with 2 mm droplets. Additionally, the use of a swirl cone nozzle, compared to full or hollow cone nozzles, better disperses droplets, enhancing the gas–liquid contact and achieving efficiencies of 99.99% for desulfurization and 99.81% for denitrification with 2 mm droplets. These insights are valuable for optimizing operational conditions in industrial-scale spray scrubbers, significantly contributing to mitigating the environmental impacts of industrial emissions.

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Section: Mathematical Methodsmentioning

confidence: 99%

Simulation of a Multistaggered Baffle Scrubber to Enhance the Efficiency of Simultaneous Desulfurization and Denitrification

Zeng,

Lee,

Kim

et al. 2024

ACS Omega

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“…This method is a wet desulfurization method using a double rotation sprayer, aimed at increasing the efficiency of absorption of sulfur dioxide gas in coal combustion gas which has a high sulfur content. Qin et al (2019) 6 Calcium formate as additive in fuel gas desulfurization in power plants Calcium formate is the salt used in the wet desulfurization process in order to avoid the formation of calcium carbonate in the desulfurization reactor and to increase the efficiency of the desulfurization. Because it can reduce the formation of lime sludge.…”

Section: Desulfurization Using Water Absorbermentioning

confidence: 99%

POST-COMBUSTION COAL DESULFURIZATION Review

Yuniar

Nursanto

Ernawati

2020

Eksergi

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The sulfur content in coal ranges from 0.5 to 5%, and it is an impurity that must be removed before burning coal, due to the toxic effects and acid rain caused by SO2 gas generated from sulfur oxidation. Sulfur cleaning technology can be carried out on coal before combustion (pre-combustion), and can reduce the inorganic sulfur content by up to 50%; however, it cannot reduce the organic sulfur content. Therefore, the industry relies on post-combustion desulfurization to remove SO2 from the gas from coal combustion. The aim of the coal desulfurization review is to direct desulfurization research to be efficient and effective, as well as to be environmentally friendly. Sulfur in coal consists of organic sulfur and inorganic sulfur. Coal inorganic sulfur consists of pyrite (FeS2), sulfate, and sulfide. The largest composition is pyrite. Organic sulfur consists of hetero-atomic and heterocyclic (thiophenic) macromolecules that bind N and O atoms, aromatic sulfides, and aromatic disulfides (small amounts). Inorganic sulfur can easily be separated from coal by means of flotation, microwave energy, magnetic forces, ultrasonic energy, and as well as microorganisms. Meanwhile, organic sulfur cannot be separated from coal by using the methods used in the inorganic sulfur separation process. Organic sulfur can be removed by chemical and biodesulfurization, however, this process is inefficient for industrial scale. The most recommended method is the absorption of SO2 gas in the gas from coal combustion, or post-combustion desulfurization. Various methods have also been investigated to separate SO2 gas, and more details will be described in this paper.

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“…The precombustion removal mainly uses low-sulfur fuels. The most common postcombustion removal technology is the wet flue gas desulfurization (WFGD), which has been widely used due to its high efficiency, fast gas–liquid reaction speed, low investment, and useful by-products. − Based on the design of reactors for the wet process, a range of reactors including packed beds, tray scrubbers, bubble reactors, and spray scrubbers can achieve efficient gas–liquid contact …”

Section: Introductionmentioning

confidence: 99%

Bionic Packings Enhance the Absorption of SO₂ in a Bubble Column

Cai,

Wang,

Liu

et al. 2023

Energy Fuels

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The development of compact reactors has attracted wide interest from chemical engineering society. Inspired by the special shape of "sea urchin", we propose that bionic packings with this type of shape are superior in breaking bubbles in a bubble column, and therefore, the mass transfer rate of gases in liquids may be greatly enhanced. In this study, different structures and quantities of bionic packings were added to a bubble column to enhance SO 2 absorption into water. The absorption rates of SO 2 into water with different bionic packings were compared with these systems with commercial packings of Pall rings and Dixon rings. The mass transfer coefficients and gas−liquid specific interfacial areas of different packings with the same volume of packings' addition were measured. Based on the comparison of SO 2 removal efficiency for systems with different packings, the system with the addition of 24 ″3.5 mm + 5 mm″ packings presented the optimum promotion effect. The liquid volumetric mass transfer coefficient (k L a) of adding 24 ″3.5 mm + 5 mm″ packings was 1.5 times of the baseline, indicating that the process was mainly controlled by liquid-phase mass transfer. The increase of the liquid volumetric mass transfer coefficient (k L a) was the combined effect of the increased liquid-phase mass transfer coefficient (k L ) and the specific interfacial area (a).

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Pilot-scale experiment and simulation optimization of dual-loop wet flue gas desulfurization spray scrubbers

Cited by 31 publications

References 34 publications

Simulation of a Multistaggered Baffle Scrubber to Enhance the Efficiency of Simultaneous Desulfurization and Denitrification

Simulation of a Multistaggered Baffle Scrubber to Enhance the Efficiency of Simultaneous Desulfurization and Denitrification

POST-COMBUSTION COAL DESULFURIZATION Review

Bionic Packings Enhance the Absorption of SO₂ in a Bubble Column

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Pilot-scale experiment and simulation optimization of dual-loop wet flue gas desulfurization spray scrubbers

Cited by 31 publications

References 34 publications

Simulation of a Multistaggered Baffle Scrubber to Enhance the Efficiency of Simultaneous Desulfurization and Denitrification

Simulation of a Multistaggered Baffle Scrubber to Enhance the Efficiency of Simultaneous Desulfurization and Denitrification

POST-COMBUSTION COAL DESULFURIZATION Review

Bionic Packings Enhance the Absorption of SO2 in a Bubble Column

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Product

Resources

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Bionic Packings Enhance the Absorption of SO₂ in a Bubble Column