Smoke Movement And Mechanical Smoke Extraction Of Generatrix Layer For Main Workshop Of Underground Hydropower Station

In recent years, some hydropower station fire disasters make people concerningabout the safe production of hydropower stations. Some special project research hasbeen conducted in Xi’an University of Architecture and Technology University andsome valuable results has been obtained, which is new and original.The main plant room of hydropower station was made up of generator, generatrix,and turbine and worm-wheel layer. Because a large number of cables, transformers,low voltage distribution panels, hydraulic device, thrust bearings circulation pumpsand other equipments are arranged in the generatrix layer, this layer is more interestingin the process of research.The main purpose of this study is to provide an effectiveexperimental basis for the revised design of state fire prevention code throughinvestigating the smoke flow pattern of generatrix layer fire, thus contributing to thehealthy and safe development of hydropower industry and protecting life and health ofemployees.This paper chooses the Ludila hydropower station’s handling way as the researchobject, the method of research chooses1:12model experiment and the fire simulationsoftware FDS. The numerical simulated results are compared with the experimentalresults. The results show good agreements between FDS simulated results and modelexperimental results.In the paper,1:12model experiment is applied to study the smoke movements oncondition that natural smoke filling. The temperature of smoke and the height of smoke layer are also be research in this paper. When a fire occurs in the generatrix layer, a lotof hot smoke will be generated. The smoke will be spread to generator floor andturbine floor via the hole between floor and floor. The space of generator floor is huge,therefore, the capacity of containing smoke of main workshop is tremendous and thecooling effect is very obvious, so smoke temperature is not the key factor to influencethe escape time when the fire happens. When the fire release rate is4.78MW, ittakes35mins for the smoke layer to reach2m above the generator storey floor, it takes13mins for the smoke layer to reach2m above the generatrix storey floor, in thesituation of natural smoke filling. The distribution regularity of smoke concentration,smoke temperature, concentration of CO and visibility are also researched by FDSsimulation, in the condition of10MW fire release rate. The results of simulatesupplement the achievements of1:12model experiment.It also investigates the impact of various parameters including the volumetric flowrate for the smoke exhaust system, locations of smoke exhaust, heat release rate on theeffectiveness of a smoke management system by the fire simulation software FDS.