科研之友
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摘要
This article evaluates the fire risk of petrol utilising a novel testing procedure that enables the measurement of heat release rate (HRR), specific mass loss rate and carbon monoxide (CO) yield of flammable liquids in a cone calorimeter. The testing procedure is a modification of the procedure described in ISO 5660-1:2002. The modification includes the use of a sample pool enabling the testing of flammable liquids. Pure petrol samples were tested. They were ignited with a spark igniter, without the use of a cone heater. The cone heater was removed before testing to avoid its heating by the flame and consequent heat radiation onto the tested sample surface. The average HRR was 612 kW m(-2) and the maximum HRR was 842 kW m(-2). The total CO yield related to mass loss was 58.6 g kg(-1) and related to the effective heat of combustion was 1.48 g MJ(-1). The immediate CO yield increased significantly with an increase in testing time (an increase in the depth level of liquid below the upper edge of the pool). Dependence equations of HRR and specific CO production rate (SCPR) on the specific mass loss rate were calculated from the obtained data. Substituting the specific mass loss rate of petrol (55 g m(-2)), which burns in an infinite diameter pool, the HRR (1,581 kW m(-2)) and SCPR (3.99 g m(-2) s(-1)) were calculated for petrol pool fire under real conditions (at pool diameter larger than 1.5 m). The calculated SCPR accounted for a CO yield of 72.55 g kg(-1).
- 出版日期2014-7
