Analysis method for calculating influence range of fire

Abstract

The invention belongs to the technical field of fire damage range analysis and particularly relates to an analysis method for calculating an influence range of a fire. The method is used for analyzingdamage conditions of equipment in a room under the condition of the fire in the room. The method comprises the steps of S1, analyzing a condition of the room where the fire is located; S2, analyzingan ignition source and target equipment in the room; S3, determining a heat release rate of the ignition source and a damage criterion of the target equipment; S4, calculating an influence range of the ignition source during combustion and a hot gas layer temperature in the room; S5, judging whether secondary combustibles exist or not: S5.1, determining fire outbreak time of the secondary combustibles; S5.2, calculating a heat release rate of the secondary combustibles; and S5.3, judging whether all the secondary combustibles are considered or not; S6, calculating a total heat release rate anda final fire influence range; and S7, analyzing damage time and damage reasons of the target equipment. The method is simple in operation; and an analysis conclusion can be quickly obtained without complicated modeling.

Description

technical field [0001] The invention belongs to the technical field of fire damage range analysis, and in particular relates to an analysis method for calculating the fire influence range. Background technique [0002] If a fire occurs in an industrial building or a civil building room, the high temperature, heat radiation, and smoke generated by the fire will adversely affect the equipment in the room, and even cause damage. When conducting a probabilistic safety assessment of the risk of fire in a room, it is necessary to assess whether the fire has caused damage to the equipment in the room, the shortest time for the damage, and the cause of the damage. This requires comprehensive consideration of factors such as room size, ventilation, wall material, location of fire source ("fire source" is "ignition source"), fire size and other factors, and calculates the extent of damage caused by fire over time. [0003] Secondary combustibles that can be ignited, such as cables or...

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Problems solved by technology

Appendix R of NUREG / CR-6850 proposes the calculation formula of the heat release rate of the cable and the fixed interval value of the fire time, but this fixed interval value is based on experimental experience, and its scope of application is narrow; the THIEF model gives the failure time of the cable in the hot gas layer The calculation method cannot solve the calculation problem of the cable fire time and heat release rate; the FLASH-CAT model provides a calculation method for calculating the heat release rate of the cable tray stack, which is similar to NUREG / CR-6850 Appendix R, using the fire Time is also a fixed interval value

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