EÚ-odbor energetického inženýrství

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Ceramic filters for high-temperature flue gas filtration and their regeneration: A review of the current state of knowledge
(ELSEVIER, 2024-07-22) Gregorovičová, Eva; Pospíšil, Jiří
The combustion of solid fuels in combustion devices produces pollutants that have a negative impact on human health and the environment. One way to reduce the concentration of sub-micron particulate matter (PM) in the flue gas is to filter the flue gas using ceramic filters. Their main advantage, compared to other flue gas cleaning methods, is the possibility of using them at high flue gas temperatures (>400 degrees C). This review article presents an overview of research articles published mainly between 2020 and 2023 on flue gas filtration using ceramic filters (candles, membranes, foams, and discs) and on their regeneration. Ceramic filters are used in many flue gas cleaning applications where the cleanliness of hot flue gas is required. Their inclusion in the flue gas path is associated with increased energy consumption for forced exhaust and pressure pulse filter regeneration. The review also includes an introduction to the materials and methods used to manufacture the filters and to test their effectiveness. This review provides a comprehensive overview of the current state of knowledge on ceramic filters. Specifically, the focus is on the filtration efficiency, pressure drop, and regeneration of the ceramic filters under consideration.
The Bulk Density and Cohesion of Submicron Particles Emitted by a Residential Boiler When Burning Solid Fuels
(MDPI, 2023-11-19) Gregorovičová, Eva; Pospíšil, Jiří; Sitek, Tomáš
Particles emitted from combustion sources have a negative impact on human health and the environment. The solid fuel boilers that are used in households are a significant source of air pollution. The present study analyzes particulate matter (PM) produced during the combustion of wood pellets, wood logs, and coke in a residential boiler. The captured particles’ particle size distribution, bulk density, and cohesion are identified. A cascade impactor was used to capture the particles, and an optical digital microscope was used to determine the bulk density and cohesion (angle of repose) of the particles. The results show that the highest particle mass concentration emitted by the boiler falls within the interval of 89–146 nm, with the combustion of wood logs producing the most particles and coke combustion producing the least. The bulk density of particles of 51–595 nm (impactor stages 4–8) ranges from 320 to 785 kg/m3 for wood logs, 372–1108 kg/m3 for wood pellets, and 435–1330 kg/m3 for coke. The PM1 particles (impactor stage 4) have the highest bulk density. In the particle size range studied, the bulk density of particles decreases significantly with increasing particle size.
Identification of Wind-Induced Particle Resuspension in Urban Environment Using CFD Modelling
(MDPI, 2023-01-01) Linda, Jakub; Pospíšil, Jiří; Köbölová, Klaudia
Air pollution caused by particulate matter (PM) is a current problem in many cities. With the introduction of strict emission limits and electric cars, lower particle production is expected in the future. However, there are sources of particles that cannot be easily influenced. These include resuspension, where particles deposited on surfaces re-enter the air, causing pollution multiple times. Resuspension can account for up to 18% of the total emissions in some cases. The present paper focuses on the use of the computational fluid dynamics (CFD) tools to describe the flow in a street canyon where resuspension by wind occurs. Based on the calculated flow, a resuspension model is applied to see where resuspension occurs and how far the particles can travel. The shear stresses on the surfaces and the character of the flow field in the boundary layer are evaluated. Different building configurations and flow parameters are tested using a simple 2D model. The model makes it possible to see in which parts of the street canyon resuspension can occur. It shows that the particles leave the street canyon only from the surfaces where the conditions are suitable for resuspension. These particles then enter the mainstream. However, most of the particles stay in the canyon, which can cause resuspension to pollute the air repeatedly. This effect can have a severe impact on human health. The total dispersion of particles in the urban environment is evaluated. The results may be useful for cities that clean the streets, as it is clear which areas will benefit most from the cleaning.
Seasonal Variability of Resuspension
(EDP Sciences, 2022-11-04) Linda, Jakub; Köbölová, Klaudia; Uhlík, Ondřej; Pospíšil, Jiří; Apeltauer, Tomáš
Particulate air pollution in cities is caused by a variety of sources. One of the less-studied contributors is wind-induced particle resuspension. As the wind speed increases, particles are removed from surfaces. These particles cause an increase in the total concentration in the air. It is known that particles of 10-2.5 m in size can be resuspended (PM10-2,5). Modern emission monitoring in cities also allows the monitoring of fine particles of 10, 2.5 and 1 m in size. The size fractions can then be sorted into PM10-2,5, PM2,5-1 and PM1. When breathed in, particles of different sizes cause various serious health risks. This paper focuses on the identification of the resuspension process of different particle size fractions by a data processing method. Data measured by automatic emission monitoring are used. It is confirmed that the concentration increase can be dominated by the fraction PM10-2,5. However, a concentration increase of fractions PM2,5-1 and PM1 is also evident with increasing wind speed. Although the increase in the PM1 fraction is smaller than PM10-2,5, it is more severe due to the respiratory deposition dose. The resuspension of particles of different fractions has different behaviours during the year. PM10-2,5 particles are dominantly resuspended in the summer months. In winter, on the other hand, the proportion of PM2.5-1 and PM1 particles increases, which may be related to the heating season
Heat transfer during condensation of water vapour in the presence of non-condensable gas in vertical tube of small diameter
(Elsevier, 2022-12-01) Toman, Filip; Kracík, Petr; Pospíšil, Jiří
The paper deals with a detailed analysis of published analytical relations for heat transfer during steam condensation in a vertical tube. The historical development of the approaches and the chronological development of the used analytical relations are presented. Attention is focused on the description of the processes at the gas phase-condensate film interface as well as on the inclusion of the influence of the presence of non-condensable gases. The analytical relations in 12 modifications are compared with each other for the same geometrical configuration of the vertical tube and identical boundary conditions. The authors performed comparative experimental measurements of the heat transfer coefficient during condensation of the vapour-gas mixture in vertical tubes of three diameters, namely 16, 20 and 26mm. Based on a comparison of the experimental results and analytical relations, recommendations are made on the validity interval of the tested relations.

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