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为揭示粒径分布对聚甲基丙烯酸甲酯(PMMA)粉尘云火焰温度的影响,本文分别采用热电偶和高速比色测温法测量了开敞空间不同粒径PMMA粉尘云的火焰温度特性。结果表明:相比30μm粉尘粒子,100nm粉尘粒子热解/挥发速率较快,燃烧更加充分,粉尘云火焰的最高温度可达1551℃,而30μm粉尘云火焰最高温度仅为1108℃;在微米尺度,随着PMMA粉尘粒径的增大,火焰最高温度和高温火焰区面积先增大后减小。20μm粉尘粒子由于其分散性较好,裂解气化特征时间尺度与燃烧反应特征时间尺度较接近,燃烧反应充分,火焰最高温度和高温火焰区面积均最大。
In order to reveal the effect of particle size distribution on the flame temperature of PMMA dust cloud, the flame temperature characteristics of PMMA dust cloud with different particle sizes in open space were measured by thermocouple and high-speed colorimetry. The results show that compared with 30μm dust particles, the 100nm dust particles pyrolyze / volatilize faster and burn more fully, the highest temperature of dust cloud flame can reach 1551 ℃, while the highest temperature of 30μm dust cloud flame is only 1108 ℃. At the micron scale , With the increase of PMMA dust particle size, the maximum flame temperature and high temperature flame area first increased and then decreased. Due to their good dispersibility, the time scale of the cracked gasification characteristics is close to the time scale of the combustion reaction characteristics, and the combustion reaction is full, and the maximum flame temperature and the high temperature flame area are the largest.