液化炭酸・液体窒素による液化ガス火災の消火

概要

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This experiment is related to extinguishment of the liquefied gas fires by carbon dioxide and liquid nitrogen. It was shown that the pool fires of liquefied gas be can extinguished as well as normal liquid pool fires. The extinguishants were discharged by tank side method or by an over head method. A fuel pan used was a square of 1 m2 made of SUS 304. Fuel used were liquefied natural gas, liquefied butane, and n-heptane. The extinction time (te) became long as the discharg rate (q') became little. Then critical discharge rate (qc') can be taken as a point that it can not extinguish no longer. The relation between extinction time and the discharge rate is calculated by following equation. te = − (V/Q) 1n (1 − qc'/q') (1) Where Q is a assumed flow rate of air and V is a assumed volume to be extinguished. The theoretical critical discharge rate is calclated by following equation. qc' = CeQ / (1 − Ce) (2) Where Ce is a flame extinguishing concentration. If the critical discharge rate is calculated from eq. 2, it can estimate the relation of the discharge rate the extinction time by using eq. 1. The calculations gave good agreement with the experimental data in case of tank side method, but disagreement with them in case of over head method.
日本火災学会の論文