Štúdium faktorov ovplyvňujúcich hasiaci účinok vody aplikovanej vo forme gélu

Abstract

Štefanický, B.: The Study of the Factors affecting the Extinguishing Effect of Water applied as a Gel. Ostrava, 2015. Dissertation thesis. Technical University, Faculty of Safety Engineering. Supervisor: prof. Ing. Pavel Poledňák, PhD.

The aim of the thesis is the study of the factors affecting the extinguishing effect of the water applied in gel form. The first chapter is focused on summarization of existing information about fire-fighting gels, their effectiveness in extinguishing fires, the experiences of their use around the world, and about conducted researches in protecting the forest cultures and structures against fire. There are given the psychochemical properties of the extinguishing substance FIRESORB® gel which was used in experimental trials and measurements at the end of the chapter. Fire-fighting FIRESORB® gel may be used as an admixture with water as the extinguishing agent for the protection of materials and structures prior to spreading fires. The examination of extinguishing efficiency of the gel at a concentration of 2% and fragmented water flow was carried out as modified examination of class A fire extinguishing. During the examination the consumption of extinguishing substance, the slaking time and optional re-flaring of the examining model was monitored. Experimental examinations of stability of the insulating layer of the extinguishing agent applied to the surface of the wood samples under the actions of heat flux were performed on the electrical radiation panel at the height of 53 kW.m-2 heat flux. Experimental measurements were conducted to determine the time to ignition of spruce wood samples which were protected by fire-fighting FIRESORB® gel with 1%, 2% and 3% concentration. The samples were placed in an upright position. The measurements of the effect of the heat flux at the time of ignition, and mass burning rate of unprotected samples and samples protected with FIRESORB®, and also the examinations of assessing the amount of the heat liberated in the thermal stress of the samples protected with fire-fighting gel were performed on a cone calorimeter. The samples were protected with the gel with 1%, 2% and 3% concentration.