Effects Of Fire Retardant Additin On The Combustion Properties Of A Charring Fuel

Abstract

Results are presented which show the effect of fire retardant addition on the fuel related properties used in diffusion flame calculations. Samples of cellulose retarded with up to 3 wt, percent of sodium hydroxide were subjected to a radiant heat flux of 40 kW/m 2 in a special apparatus designed for this purpose. The volatile products of pyrolysis were analyzed using a gas chromatograph to determine the concentration of inert gases (carbon dioxide and water). Retardant addition was found to increase both the char yield and the production of inert gases. This results in a decrease in the fuel fraction in the pyrolysate from 69 wt. percent for pure cellulose to 35 wt. percent for retarded cellulose. The corresponding change in the stoichiometric oxygen/fuel ratio is from 1.6 for pure cellulose to a maximum of 2.3 for retarded cellulose. Retardant addition also causes a decrease in the heat of gasification (defined as the energy input to generate a unit mass of volatiles) and an increase in the heat of combustion of the combustible gases in the pyrolysate.

Experimental Study of Material Thickness Effect on Combustion Characteristic for Molded Polystyrene Board

“…The combustion and pyrolysis behavior of polystyrene insulation board has a lot to do with whether the temperature over 300 ℃, when the temperature is higher than 300 ℃, the material begins to decompose and produce various kinds of low molecular compounds [5,6]. Its ignition temperature is about between 350 and 490 ℃.…”

Flammability Characteristics of Chemical Treated Woven Hemp Fabric

“…Shafizadeh, et al [13] in their work, evaluated the mechanistic of fire retardant and ranked NaOH in their list of retardants. Chen, et al [14], on the other hand, worked on the effects of fire retardant addition on the combustion properties of a charring fuel and used NaOH as the fire retardants. Mostashari, et al [15] investigated the effect of NaOH deposition on the cotton the rmogravimetry.…”