Numerical simulation of ventilation airflow organization during blasting excavation of underground powerhouse of Weifang Pumped-Storage Power Station in Shandong
[Objective]In order to solve the problem of excessive ventilation and smoke emission during the blasting and excava-tion of the underground powerhouse of the pumped-storage power station,[Methods]based on the actual construction during the blasting and excavation of the Weifang Pumped-Storage Power Station in Shandong,relevant data were collected on site,and the Fluent numerical simulation software was used to analyze the actual situation.Numerical simulation of ventilation air distribution during blasting and excavation of pumped-storage power station was carried out,and the ventilation air distribution was improved.[Results]The result show that:through the improvement measures of allocating a certain amount of air supply to the non-con-struction cavern,positive pressure can be maintained in the non-blasting cavern to avoid the entry of pollutants and the formation of secondary pollution.Set up improvement measures such as wind-shielding walls,air supply and exhaust can form downstream ventilation with the shortest ventilation path.Before the shaft is opened,the jet fan is installed in the middle of the long-distance tunnel to form mechanical ventilation,so that mechanical ventilation and the combination of natural exhaust can effectively short-en the time for pollutants to reach the standard.After the shaft is opened,the exhaust fan is installed at the exit of the shaft,and the combination of permanent exposure can improve the exhaust capacity of the shaft and greatly shorten the time for pollutants to reach the standard.[Conclusion]The research results provide the basis and technical support for the construction ventilation de-sign of similar projects.
pumped storage power stationunderground workshopblasting excavationair distributionthe numerical simulation
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