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Report No.
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Rationalization design on large equipment dismantling facility; The cell fire-extinguishing examination I

Donomae, Yasushi ; Matsumoto, Yoshihiro; Kikuchi, Yutaka ; Kato, Noriyoshi; Miyazaki, Hitoshi; Tanimoto, Kenichi

In order to rationalize for Large Equipment Dismantling Facility (LEDF), the plan of removing vaporizer belong to Cell-fire-extinguishing-system was investigated. In this test, in order to study the behavior of pressure in cell, when the liquefaction carbon dioxide (liq-CO$$_{2}$$) is emitted, and the performanee of extinguishing fires, the test of behavior of pressure and the extinguishing fires take effect. Also the extinguishing fires test used water-mist take effect for complement liq-CO$$_{2}$$. The results as follows; (1)In the test of behavior of pressure, Liq-CO$$_{2}$$ was emitted test room under -40mmAq negative pressure. Room pressure was increase about 0.8mmAq/sec at first. After 29sec, the pressure was increase slowly about 0.1mmAq/sec. After 120sec, the increase was drastic about 1.5mmAq/s. (2)In the test of extinguishing fires by liq-CO$$_{2}$$, under -40mmAq, Polyethylene and wooden chips + cotton (crib) was burn. Polyethylene was extinguished perfectly, but the embers remained in cribs. While the room pressure was increase about 1.3mmAq/sec for 10sec at first. After 30 sec, the pressure was increase about 1mmAq/sec. On the other hand, the drastic increase of pressure disappeared between 100sec to 120sec by change the nozzle size from 14mm$$^{2}$$ to 10mm$$^{2}$$. (3)In the test of extinguishing fires by water-mist, Cribs was extinguished perfectly, but Polyethylene was extinguished difficulty under the same condition of liq-CO$$_{2}$$ test. (4)Therefore the results, It's coped with the fire extinguishing and the keeping negative pressure for LEDF cells. Therefore nozzle size is fitted cell volume as changing 14mm$$^{2}$$ to 10mm$$^{2}$$. (5)As the performance of extinguishing fires by liq-CO$$_{2}$$, It is necessity the concentration of above 50% CO$$_{2}$$ for combustibles as cribs, remaining the embers. (6)On the other hand, It is necessity most study for the adoption of water-mist. Therefore water-mist was not effective for polyethylene, and it needed water ...

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