Smoke Movement And Controlling In The Handling Way Fires Of Main Transformer Room In The Underground Hydropower Station

The development and construction of our country’s hydropower resources is in thefast development period. Because of hydropower station’s production process, some ofthe cavities have the big fire hazards. So the fire safety problems in hydropower stationare of critical importance. Research on the law of the fire’s occurrence and developmentin the underground hydropower station’s cavities is significant for strengthening thesafety design and smoke exhaust design of the underground hydropower station’scavities. Nowadays, the research on the fire risk control of the underground hydropowerstation’s cavities is still in the blank. The purpose of this article is that through the fireresearch of the underground hydropower station’s handling way of the main transformerroom, we can put forward the expected control methods for the large and medium-sizedhydropower station, and then determine appropriate ventilation airflow organizationplans, providing the basis for the revision of our countries’ fire prevention designspecification of the hydropower station.This paper chooses the Ludila hydropower station’s handling way as the researchobject, and it mainly focus on the law of the smoke movement and the various ways ofsmoke exhaust effect in the burning stage. The specific content is as follows:(1) In this paper,1:12model experiment is applied to study the smoke movementunder different fire scenarios. Further more, in order to study the mechanical smoke exhaust effect, we changed the mechanical smoke exhaust rate.(2) According to the Ludila hydropower station’s ventilation design, the reasonablefire scenario was designed. We used the fire simulation software FDS simulating thesmoke movement of several fire scenarios, and studied the law of the smoke movement,the speed of the smoke movement, the distribution regularity of smoke concentration,smoke temperature, concentration of CO and visibility.(3) This paper studied the mechanical smoke exhaust effect with the handling wayinstalled the inverted T word shape smoke screen. It comes to the conclusion that thesmoke control effect under the condition of combination of the mechanical smokeexhaust and the smoke screen is better than only of the mechanical smoke exhaust.(4)This paper further made some research on controlling effect when the handlingway was installed smoke exhaust passage (on the top of the handling way).Under thecondition that the handling way was installed smoke exhaust passage, through changingthe mechanical smoke exhaust rate, the smoke layer won’t appear the “plugholing”phenomenon in the larger exhaust rate case, instead, most of the smoke will be suckedthrough the exhaust port so that the smoke will be controlled on both sides of theexhaust port, reducing the risk of fire. In addition, when the handling way is on fire,only opening the two exhaust ports on both sides of the fire, the smoke control effectwill be better, and it will be more conducive for the personnel to escape. The study willbe providing the reference for the design and revision of our countries’ fire preventiondesign specification of the hydropower station’s handling way.