Modelling the process of formation of welding aerosol in welding of mining equipment

Гришагин, В. М.; Demenkova, L. G.

doi:10.1080/09507116.2012.694636

Cited by 3 publications

(3 citation statements)

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“…Additionally, particles with a diameter smaller than 0.1 µm practically do not follow the law of gravity and are in uenced by aerodynamic forces that prevent them from settling down [12]. For example, for a particle radius of 25 nm, the settling velocity becomes practically equal to 0 [13].…”

Section: Introductionmentioning

confidence: 99%

Features of fume distribution in the working zone during arc welding operations with various covered electrodes

Kirichenko,

Stratidakis,

Kholodov

et al. 2024

Preprint

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Particles in welding fumes (WFs) generated through arc welding operations pose serious health concerns to the welders through their exposure to heavy metals. In this study, the influence of different covering types of industrial electrodes (rutile, basic, acid, rutile-cellulose) on the particle size distribution, morphology, and elemental composition of particles of welding fumes was investigated. Quantitative analysis was conducted in order to determine the distribution of particles with diameters of 10μm, or less, (PM10 fraction) of the WFs within the workplace, followed by the comparison of the results with the current international normative documents on the maximum permissible concentration of the PM10 fraction in the working zone air. The most hazardous types of electrode coverings were determined based on the dispersion, chemical composition, and concentration of formed particles of the PM10 fraction in space and time. The dependence of the particle size distribution time of the WFs in the working zone was identified for a basic covered industrial electrode. The maximum sizes of WF particles were reported for operations held at 100 A with electrodes having the rutile-cellulose type of covering, and at 150 A having the basic type of covering. A concentration of 0.05 mg/m3 for the PM10 fraction of WFs in the workplace was achieved after 1 hour of the welding machine operation at a current equal to 100 A. Thus, the results of the characterization of WFs demonstrate the risks of the arc welding process to human health and stress the need for their control and mitigation. According to the results of the study, a proportional relationship between the average particle diameter and the WF particle distribution period in the workplace has been demonstrated, which has been particularly evident from the height of the WF particles. 3D modeling of the dispersion of WF particles during welding arc operations proved to be a suitable method for their characterization.

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Section: Introductionmentioning

confidence: 99%

Features of fume distribution in the working zone during arc welding operations with various covered electrodes

Kirichenko,

Stratidakis,

Kholodov

et al. 2024

Preprint

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“…The most dangerous area with maximum density of nano-and microparticles of welding fumes was singled out: 1.3 m in height and 5 meters in all directions.Welding aerosol is a disperse system in which the solid component of the welding aerosol (SCWA) acts as the phase, and the mixture of gases (gaseous component of welding aerosol, or GCWA) -as the medium. SCWA stays suspended in the air for a long time spreading far beyond the working area of a welder [1].The aim of this work was to create a 3D-model of a welding aerosol cloud, demonstrating the spread of nano-and microparticles of welding aerosol in the working area of a welder. The 3D model was created using granulometric data of samples collected by the author's method.…”

mentioning

confidence: 99%

“…Welding aerosol is a disperse system in which the solid component of the welding aerosol (SCWA) acts as the phase, and the mixture of gases (gaseous component of welding aerosol, or GCWA) -as the medium. SCWA stays suspended in the air for a long time spreading far beyond the working area of a welder [1].…”

mentioning

confidence: 99%

3D-Modeling of the Distribution of Welding Aerosol Nano- and Microparticles in the Working Area

Kirichenko

Дрозд

Gridasov

et al. 2017

NHC

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The first results of the research of the distribution of welding aerosol nano- and microparticles in the working area based on substance and morphological analysis are presented in the paper. A 3D-model of the welding aerosol cloud demonstrating the distribution of nano- and microparticles in the working area of the welder was created using the granulometric data of the samples. The most dangerous area with maximum density of nano- and microparticles of welding fumes was singled out: 1.3 m in height and 5 meters in all directions.Welding aerosol is a disperse system in which the solid component of the welding aerosol (SCWA) acts as the phase, and the mixture of gases (gaseous component of welding aerosol, or GCWA) – as the medium. SCWA stays suspended in the air for a long time spreading far beyond the working area of a welder [1].The aim of this work was to create a 3D-model of a welding aerosol cloud, demonstrating the spread of nano- and microparticles of welding aerosol in the working area of a welder. The 3D model was created using granulometric data of samples collected by the author’s method.

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Метод Жидкостной Пленочной Нейтрализации Токсичных Газовых Выбросов

Statsenko¹,

Eremenko²,

Bernаvskaya³

2020

ВИШ ДВФУ

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Для очистки воздуха от газовых технологических выбросов и аэрозолей, а также выхлопных газов от энергетических установок (в том числе судовых) предлагается использование метода пленочной жидкостной нейтрализации, что применяется в химических технологиях. Установка представляет собой закрытый корпус, в котором организовано пленочное течение жидкости по вертикальным пластинам. При движении загрязненного воздуха между пластинами пленка жидкости как абсорбент интенсивно поглощает газообразные и твердые загрязняющие вещества. Для исследования интенсивности абсорбции газов авторами настоящей статьи спроектирован и изготовлен экспериментальный стенд, в котором на вертикальной латунной пластине задается пленочное течение воды и раствора соды, вдоль пленки вверх движется воздух, содержащий газы: двуокись углерода, окись углерода, окись азота различной концентрации. В экспериментах изменялись скорость воздуха, расход жидкости, концентрация газов. Анализ результатов показал: при использовании воды в качестве абсорбирующего элемента оптимальная скорость воздуха составляет 0,8–1 м/с, оптимальный расход – 1,2–1,37 л/мин. Это позволяет снизить концентрацию газа двуокиси углерода на 30–45%, окиси углерода – на 20–30% и окиси азота – на 18–23%. При использовании в качестве абсорбирующего элемента раствора соды для двуокиси углерода возможно снижение концентрации на 30–40%, для окиси углерода – на 50–55%. For the purification of air from gas emissions and aerosols, a liquid neutralization unit is pro-posed. It is a closed case, in which the film flow of liquid along vertical plates is organized. When polluted air moves between the plates, the liquid film as an absorbent intensively absorbs gaseous and solid pollutants. To study the intensity of gas absorption, an experimental stand was designed and manufactured in which a film flow of water and a soda solution is set on a vertical brass plate, air, which contains gases: carbon dioxide, carbon monoxide, nitric oxide of various concentra-tions, moves upward along the film. In the experiments, the air velocity, fluid flow rate, and gas concentration changed. As a result of the analysis of the obtained results, it was revealed that when using water as an absorbing element, the optimal air velocity is 0.8–1 m/s, the optimal water flow rate is 1,2–1,37 l/min. This allows you to reduce the concentration of carbon dioxide as by 30–45%, carbon mon-oxide as by 20–30% and nitric oxide gas by 18–23%. When using a solution of soda for carbon dioxide as an absorbing element, it is possible to reduce the concentration by 30–40%, for carbon monoxide by 50– 55%. When calculating the universal characteristics of the fluid flow in the form of a film, the irrigation value is obtained.

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Modelling the process of formation of welding aerosol in welding of mining equipment

Cited by 3 publications

References 0 publications

Features of fume distribution in the working zone during arc welding operations with various covered electrodes

Features of fume distribution in the working zone during arc welding operations with various covered electrodes

3D-Modeling of the Distribution of Welding Aerosol Nano- and Microparticles in the Working Area

Метод Жидкостной Пленочной Нейтрализации Токсичных Газовых Выбросов

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