Improvement of aerosol spray scavenging efficiency with water mist

Liang, Hui; Zhou, Qian; Erkan, Nejdet; Suzuki, Shunichi

doi:10.1016/j.jaerosci.2020.105697

Cited by 15 publications

(5 citation statements)

References 19 publications

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“…To determine the atomization performance of gas-liquid two-phase flow spray, including D 50 , D [3,2] , D [4,3] , etc.…”

Section: Experimental Schemesmentioning

confidence: 99%

“…The experimental group 2 is an experiment on atomization characteristics of gas-liquid two-phase flow nozzle, which involved atomization parameters of D 25 , D 50 , D 75 , D 90 , D [3,2] and D [4,3] . The water supply pressure of the nozzle was kept constant at 0.20MPa and the gas supply pressure was adjusted to 0.15 MPa, 0.18 MPa, 0.20 MPa, 0.25 MPa, 0.27 MPa and 0.29 MPa.…”

Section: Experimental Schemesmentioning

confidence: 99%

“…The size distributions of the mist particles that are produced by the gas-liquid twophase flow nozzle when the water supply pressure is 0.20 MPa and the gas supply pressure is 0.15 MPa, 0.18 MPa, 0.20 MPa, 0.25 MPa, 0.27 MPa and 0.29 MPa are shown in Figure 7. Obviously, all the parameters that describe the mist particle size, including D 25 , D 50 , D 75 , D 90, D [3,2] and D [4,3] , decrease with the increase in the gas supply pressure from 0.15 MPa to 0.29 MP when the water supply pressure is 0.20 MPa. 8 shows that, when the water supply pressure remained constant at 0.20 MPa with the increase in the air supply pressure, the peak for the differential distribution of the fogdrop particles gradually moved to the right, that is, the direction of reduced fogdrop particle size.…”

Section: Atomization Characteristics Of the Gas-liquid Two-phase Flow Nozzlementioning

confidence: 99%

“…The larger the inertia coefficient, the higher the collision probability of the dust and water droplets. Equation (3) shows that the coefficient of inertia is proportional to the relative velocity and diameter of the dust particles and is inversely proportional to the diameter of the droplets.…”

Section: Respirable Dust Capture Effect Of the Gas-liquid Two-phase Flow Nozzlementioning

confidence: 99%

“…Recently, dust pollution of the fully mechanized mining surface in underground coal mines has become increasingly prominent with the continuous improvement of the mechanization level and gradual growth of mining intensity [1][2][3][4]. These dusts, especially respirable dusts, threaten the physical health of workers and production safety in coal mining activities [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Atomization Characteristics of Gas–Liquid Two-Phase Flow Nozzle and Its Dust Removal Effect

et al. 2022

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An experimental study on the flow rate and atomization characteristics of a new gas–liquid two-phase flow nozzle was carried out to use high-concentration respirable dust in the workplace of high-efficiency sedimentation coal production based on the gas–liquid two-phase flow nozzle technology. The simulation roadway of dust fall in large coal mines was constructed, and the respirable rock dust produced by fully mechanized mining surfaces was chosen as the research object. The effects of humidity on the capture effect of respirable rock dust were analyzed in the experimental study. The results demonstrated that: (1) the distribution range of the particle size of fogdrops declines with the reduction in fogdrops D50, D[3,2] and D[4,3], which are produced by gas–liquid two-phase flow nozzles. (2) The initial ambient humidity in the simulated roadway was 64.8% RH. After the gas–liquid two-phase flow spray was started, the ambient humidity was elevated by 23.2 to 23.5% RH within 840s and tended to be stable and no longer grew after reaching 88.0–88.3% RH. The initial growth rate of the ambient humidity in the simulated roadway was high, and then was gradually slowed down. (3) Humidity is an important factor influencing the collection of respirable dust. The humidity at 10.0 m leeward of the dust-producing point was increased by 19.6% RH, and the sedimentation rate of respirable dust was increased by 6.73%; the two growth rates were 13.1% RH and 9.90% at 20.0 m; 16.4% RH and 15.42% at 30.0 m; 18.4% RH and 11.20% at 40.0 m. In practical applications of the gas–liquid two-phase flow nozzle in coal mining activities, attention shall be paid to not only the influences of its atomization characteristics on the capture effect of respirable dust but also the influences of the flow rate of the nozzle on the humidity of the working surface. Appropriate gas and water supply pressures shall be chosen according to the space and respirable dust concentration on the working surface to realize a better dust removal effect.

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“…To determine the atomization performance of gas-liquid two-phase flow spray, including D 50 , D [3,2] , D [4,3] , etc.…”

Section: Experimental Schemesmentioning

confidence: 99%

Section: Experimental Schemesmentioning

confidence: 99%

Section: Atomization Characteristics Of the Gas-liquid Two-phase Flow Nozzlementioning

confidence: 99%

Section: Respirable Dust Capture Effect Of the Gas-liquid Two-phase Flow Nozzlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Atomization Characteristics of Gas–Liquid Two-Phase Flow Nozzle and Its Dust Removal Effect

et al. 2022

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Experimental Investigation on Fresh Air Purification by Water Mist and Negative Ions

Yang,

Wu,

et al. 2024

Environmental Science and Engineering

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Experimental investigation on effective aerosol scavenging using different spray configurations with pre-injection of water mist for Fukushima Daiichi decommissioning

Xu,

Sharma,

Ozdemir

et al. 2024

NUCL SCI TECH

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During the decommissioning of the Fukushima Daiichi nuclear power plant, it is important to consider the retrieval of resolidified debris both in air and underwater configurations. For the subsequent retrieval of debris from the reactor building, the resolidified debris must be cut into smaller pieces using various cutting methods. During the cutting process, aerosol particles are expected to be generated at the submicron scale. It has been noted that such aerosols sizing within the Greenfield gap (0.1–1 μm) are difficult to remove effectively using traditional spraying methods. Therefore, to improve the aerosol removal efficiency of the spray system, a new aerosol agglomeration method was recently proposed, which involves injecting water mist to enlarge the sizes of the aerosol particles before removing them using water sprays. In this study, a series of experiments were performed to clarify the proper spray configurations for effective aerosol scavenging and to improve the performance of the water mist. The experimental results showed that the spray flow rate and droplet characteristics are important factors for the aerosol-scavenging efficiency and performance of the water mist. The results obtained from this study will be helpful for the optimization of the spray system design for effective aerosol scavenging during the decommissioning of the Fukushima Daiichi plant.

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Improvement of aerosol spray scavenging efficiency with water mist

Cited by 15 publications

References 19 publications

Experimental Study on Atomization Characteristics of Gas–Liquid Two-Phase Flow Nozzle and Its Dust Removal Effect

Experimental Study on Atomization Characteristics of Gas–Liquid Two-Phase Flow Nozzle and Its Dust Removal Effect

Experimental Investigation on Fresh Air Purification by Water Mist and Negative Ions

Experimental investigation on effective aerosol scavenging using different spray configurations with pre-injection of water mist for Fukushima Daiichi decommissioning

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