A CFD analysis of the pollutant dispersion from cooling towers with various configurations in the lower region of atmospheric boundary layer

Sedighi, Ali Asghar; Bazargan, Majid

doi:10.1016/j.scitotenv.2019.133939

Cited by 18 publications

(6 citation statements)

References 27 publications

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“…Granados-Ortiz et al [22] studied the influence of both experimental and parametric uncertainty from the turbulence intensity in the computation of an under-expanded jet flow. Sedighi and Bazargan [23] investigated the mixing and merging of buoyant exhaust plumes originating from multiple small cooling towers in the atmosphere, focusing on the counter-rotating vortex pair as the dominant mechanism affecting the flow pattern. Bai et al [24] used an existing meteorological model to study SO 2 diffusion from a single ship.…”

Section: Introductionmentioning

confidence: 99%

Uncertainty Quantification Analysis of Exhaust Gas Plume in a Crosswind

Domenico

Cravero

2023

Energies

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The design of naval exhaust funnels has to take into account the interaction between the hot gases and topside structures, which usually includes critical electronic devices. Being able to predict the propagation trajectory, shape and temperature distribution of an exhaust gas plume is highly strategic in different industrial sectors. The propagation of a stack plume can be affected by different uncertainty factors, such as those related to the wind flow and gas flow conditions at the funnel exit. The constant growth of computational resources has allowed simulations to gain a key role in the early design phase. However, it is still difficult to model all the aspects of real physical problems in actual applications and, therefore, to completely rely upon the quantitative results of numerical simulations. One of the most important aspects is related to input variable uncertainty, which can significantly affect the simulation result. With this aim, the discipline of Uncertainty Quantification provides several methods to evaluate uncertainty propagation in numerical simulations. In this paper, UQ procedures are applied to a CFD simulation of a single plume in a crossflow. The authors test the influence of the uncertainty propagation of the chimney exit velocity and the main flow angle on the plume flow development. Two different UQ methods are applied to the analysis: the surrogate-based approach and the polynomial chaos expansion method. A comparison of the two methods is performed in order to find their pros and cons, focusing on the different and detailed quantities of interest.

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Section: Introductionmentioning

confidence: 99%

Uncertainty Quantification Analysis of Exhaust Gas Plume in a Crosswind

Domenico

Cravero

2023

Energies

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“…During the operation of large natural draft cooling towers, a significant amount of water vapor is generated, forming wet plume that affects the surrounding landscape environment and impacts the local air humidity. If water vapor collects under the influence of the structure, it can also create a wide range of dark clouds, resulting in solar radiation loss and, in severe cases, reducing local crop yields 1 , 2 . For large natural draft cooling towers using seawater, the wet plume also contains a significant amount of salt particles.…”

Section: Introductionmentioning

confidence: 99%

An open GIS based 3D simulation software to predict cooling tower drift diffusion

Wang,

Lv,

Liu

et al. 2023

Sci Rep

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This paper developed XJCT-3D, a simulation software for cooling tower wet plume dispersion. By coupling it with the Open GIS component Dotspatial, we have achieved geospatial visual representation of the calculation results, which has solved the problems of low calculation efficiency and insufficient visual representation of the traditional CFD software in the calculation of cooling tower wet plume dispersion. In order to verify the validity of the XJCT-3D software simulation results, we have conducted tracer experimental data from the ChalkPoint power plant. XJCT-3D accurately models wet plume deposition during cooling tower operation. From the XJCT-3D calculation results, we have observed that the maximum value of the cooling tower thermal plume wet deposition occurs near 610 m with a maximum value of 6.9E−07 kg/m2 s. This finding suggests that the cooling tower emissions carry a significant load of particles or droplets that have settled on surfaces at this particular altitude. It provides insights into potential environmental and human health impacts and helps in identifying and assessing areas at relatively higher risk of deposition, such as nearby ecosystems, farmland, or urban areas. This information can contribute to the development of effective mitigation strategies and the implementation of appropriate measures to minimize the impact of cooling tower emissions.

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“…The other solution to product sustainable power is to use a SCPP that required heat can be supplied from another source in addition to the solar radiation. In some gas power plant, the hot outlet gas from turbine is released into the atmosphere which leads to the air pollution and wasting energy 33 , 34 . Researchers 35 – 38 tried to use the outlet hot gas from gas power plants in a SCPP to increase output power as well as product sustainable power.…”

Section: Introductionmentioning

confidence: 99%

Improvment of combined solar chimney power plant with gas power plant

Mirzamohammad

Yazdi

Lavasani

2023

Sci Rep

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Recently, several researches have been done to improve the perfomance of solar chimney power plants (SCPP) and increase their low output power during hours when the solar radiation is limited. In this study, by combining a SCPP and a gas power plant, the output power is increased and the power output of the combined power plant can be gained at all hours of the day and night. Pipes are buried under the ground and the outlet hot gas from gas power plant flows through the buried pipes instead of being released into the atmosphere through the stacks. Flowing of hot gas through the buried pipes at the soil under the canopy increases the temperature of soil which is exposed to the solar radiation. Increasing of the soil temperature leads to the growth in the value of air temperature under the canopy. The air density reduces as the air temperature increases which leads to the increase of air velocity and output power. By applying the buried pipes, the output power is not zero during the hours when there is no radiation flux. The results for air temperature, heat loss and output power are studied in detail and it is shown that the use of buried pipes in which hot gas flows leads to the increase of the output power of SCPP by 554%, 208% and 125% at the radiation flux of 200 W/m2, 500 W/m2 and 800 W/m2, respectively.

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A CFD analysis of the pollutant dispersion from cooling towers with various configurations in the lower region of atmospheric boundary layer

Cited by 18 publications

References 27 publications

Uncertainty Quantification Analysis of Exhaust Gas Plume in a Crosswind

Uncertainty Quantification Analysis of Exhaust Gas Plume in a Crosswind

An open GIS based 3D simulation software to predict cooling tower drift diffusion

Improvment of combined solar chimney power plant with gas power plant

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