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A platform for research: civil engineering, architecture and urbanism
Minimizing the scrubbed flue gas concentration near ground by appropriate selection of sources in a tandem arrangement of cooling towers
Abstract The wet scrubbing is one of the effective techniques to reduce the pollutant concentration in the power plants. The low temperature scrubbed flue gas can be added to the outlet buoyant plume of a cooling tower to reach the desired altitude. In large power plants, there are a number of cooling towers located in different arrangements with respect to the wind direction. A tandem layout of the towers leads to a more complicated flow geometry to analyze as the flow outlet from each source is highly affected by others. In this study, the behavior of outlet plumes from single cooling tower, as well as tandem arrangements of sources with two, three and four towers are investigated to discover the more appropriate towers for the scrubbed flue gas to be released from. An additional species transport equation is included to the set of governing equations per each added cooling tower in order to recognize the contribution of each tower in the pollutant concentration at any point in the flow. This innovative numerical modeling technique makes it possible to clearly distinguish the details of the outflow from each cooling tower in the course of the flow. The interactions between the outlet plumes are explained by analyzing the vortex behavior and pressure distribution which are strongly affected by the number of the cooling towers in the wind direction.
Highlights CFD is used to model the intertwined outlet plumes from cooling towers in tandem. Most appropriate scenario for releasing scrubbed flue gas from towers is detected. Effects of vortices on surrounding air varies by the position and number of towers. Outlet column of plumes are affected by the low pressure area downstream of towers.
Minimizing the scrubbed flue gas concentration near ground by appropriate selection of sources in a tandem arrangement of cooling towers
Abstract The wet scrubbing is one of the effective techniques to reduce the pollutant concentration in the power plants. The low temperature scrubbed flue gas can be added to the outlet buoyant plume of a cooling tower to reach the desired altitude. In large power plants, there are a number of cooling towers located in different arrangements with respect to the wind direction. A tandem layout of the towers leads to a more complicated flow geometry to analyze as the flow outlet from each source is highly affected by others. In this study, the behavior of outlet plumes from single cooling tower, as well as tandem arrangements of sources with two, three and four towers are investigated to discover the more appropriate towers for the scrubbed flue gas to be released from. An additional species transport equation is included to the set of governing equations per each added cooling tower in order to recognize the contribution of each tower in the pollutant concentration at any point in the flow. This innovative numerical modeling technique makes it possible to clearly distinguish the details of the outflow from each cooling tower in the course of the flow. The interactions between the outlet plumes are explained by analyzing the vortex behavior and pressure distribution which are strongly affected by the number of the cooling towers in the wind direction.
Highlights CFD is used to model the intertwined outlet plumes from cooling towers in tandem. Most appropriate scenario for releasing scrubbed flue gas from towers is detected. Effects of vortices on surrounding air varies by the position and number of towers. Outlet column of plumes are affected by the low pressure area downstream of towers.
Minimizing the scrubbed flue gas concentration near ground by appropriate selection of sources in a tandem arrangement of cooling towers
Sedighi, Ali Asghar (author) / Bazargan, Majid (author)
Building and Environment ; 179
2020-05-07
Article (Journal)
Electronic Resource
English
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