CRT電視機火災之危害性

Harmfulness of CRT-TV Fire

本研究以CRT 電視機為試驗對象，進行火災燃燒試驗及煙毒性指數試驗，分析CRT 電視機引燃後之溫度場域分布、熱輻射值、熱釋放率、CO/CO2 氣體濃度及電視機外殼材料煙毒指數，以探討CRT 電視機火災之危害性。經由火災燃燒試驗結果顯示，在CRT 電視機溫度場域分布方面：上方80cm 及周圍60cm 處溫度皆可達300 ℃以上。在熱輻射方面：周圍20cm 內熱輻射值為1.02~3.20 W/cm2 。若於此範圍內置放可燃物、櫥櫃或無耐燃等級裝修材料，有可能造成火災延燒擴大。利用氣體分析儀分析CO/CO2 發現：CRT 電視機燃燒時產生CO ，已達到危害人體數值，造成1 小時內感覺頭痛、噁心、呼吸不暢之症狀，且與CRT 電視機尺寸有關。在NES-713 材料煙毒性指數試驗，發現CRT 電視機塑膠外殼材料會產生CO 、CO2 、NOX 、HCHO 等氣體，試驗之CRT 電視機外殼材料煙毒指數為1.73~4.334 ，皆大於1 ，足以讓人員於30 分鐘內造成死亡之危險性。

In this research, the Cathode Ray Tube television (CRT-TV) was considered for fire burning experiment and smoke toxicity index experiment. The field distribution of temperature, value of heat flux, heat release rate, CO/CO2 concentration, and smoke toxicity index of TV housing material were analyzed to determine the jeopardy of television fire. Findings were concluded from the experiment results as follows: the temperature was as high as 300 ℃ above at 80 cm in top of specimen and 60 cm in its circle in terms of the field distribution of temperature in CRT-TV: the value of heat flux was 1.02~3.20 W/cm2 within 20 cm in its surrounding and the fire tended to expand if flammable object was positioned within this range without fire resistance. From the analysis of CO/ CO2 by gas analyzer, it showed that the CO produced from the burning CRT-TV could cause symptoms of headache, disgusting and breathing difficulty in one hour as it reached to danger degree for human body. It was also found that such condition was correlated with the size of CRT-TV. In the experiment of NES-713 material smoky toxicity index experiment, the plastic housing material of CRT-TV could produce gases like CO, CO2 , NOX and HCHO; its smoky toxicity index was 1.73~4.334 and >1, this could cause jeopardy of human death within 30 minutes.