In the process of firefighting and emergency rescue, firefighting boots are one of the most important personal protective equipments (PPEs) for firefighters to protect their feet and legs from thermal radiation injury. In this work, the self-designed long-term thermal radiation setup was employed to measure the critical failure temperature for firefighting boots with various radiation intensities and reveal the performance influence of radiation intensity on critical parameters, including the temperature rise inside or outside, hardness and mass loss of firefighting boots, when radiating from the front, the side or all around. The Henriques Burn Integral (HBI) was adopted to predict second-degree skin burn injury. The results show that with the radiation intensity increasing, the temperature inside or outside increases, and the hardness and mass of firefighting boots decrease. The declined magnitude of hardness goes down as the radiation time lapses. The second-degree burn time is advanced with the increase in radiation intensity. The second-degree skin burn time at 7 kW/m² is 166s and the predicted value was short. When the surface temperature of firefighting boots is up to about 140 °C, the boots’ toe color appears from bright yellow to scorched black, along with the bulge phenomenon, indicating its protection effect loss. At the identical radiation intensity, the temperature rises of the boots radiating from all around are larger than those of other conditions, and the maximum temperature of the inner surface of the boots radiating from the side at 7 kW/m² is 1.9 times higher than that radiating from the front, indicating that the side of firefighting boots is weakness in an actual fire.

在灭火和应急救援过程中，消防靴是消防员最重要的个人防护装备（PPE）之一，保护其脚部和腿部免受热辐射伤害。本工作采用自行设计的长期热辐射装置，测量了不同辐射强度下消防靴的临界失效温度，揭示了辐射强度对关键参数（包括内外温升、硬度等）性能的影响。消防靴从正面、侧面或四周辐射时的质量损失。采用 Henriques Burn Integral (HBI) 来预测二级皮肤烧伤。结果表明，随着辐射强度的增加，消防靴内部或外部的温度升高，消防靴的硬度和质量减小。硬度的下降幅度随着辐射时间的流逝而下降。随着辐射强度的增加，二度烧伤时间提前。^{7 kW/m 2}下皮肤二级灼伤时间为166s，预测值较短。当消防靴表面温度达到140℃左右时，靴头颜色由鲜黄色变为焦黑色，并出现鼓包现象，表明其防护效果丧失。在相同辐射强度下，靴子四周辐射的温升比其他条件下的要大，侧面辐射7 kW/m 2 时靴子内表面的最高温度^是周围辐射的1.9倍。从前面辐射出来，表明消防靴的侧面在实际火灾中是薄弱环节。