摘要
根据准稳态法测量热导率的原理，在69～580℃范围内，测试了微波辐照改性前后7种工况下高平无烟煤和海拉尔褐煤的热导率。它们的热导率随温度的变化总体接近正弦周期峰谷曲线分布，与B．14．Byropmi关于顿巴茨和卡拉干达7种煤在120～530℃的热导率变化规律相似。但所测煤样在300—320℃之间出现明显峰值，特别是微波辐照改性后峰值更加陡峭。在180—400℃范围内，高平无烟煤经微波辐照改性的热导率值比原煤样高，最高峰值为原煤样的2．5倍，出现波谷较原煤样有延迟；450℃以后，微波辐照改性的煤样热导率呈现上升趋势。海拉尔褐煤的热导率在580％以内随温度的变化基本相同，480℃以后微波辐照改性再烟气干燥的煤样热导率增长优势凸显。实验证明微波辐照改性可以大大地提高煤的热导率。
According to the principle of the quasi - steady state method, the thermal conductivities of coal samples which are four kinds of condition of Gaoping anthracite and three kinds of condition of Hailaer lignite before and after microwave radiation modification were heated and tested, within the scope of 69℃ to 580℃. The changes of their thermal conductivity with temperature were close to sinu- soidal periodic peak valley curve, which were similar with the laws of the thermal conductivity of seven kinds of bartz and Karaganda coal of B. FI. Byroprm of the former soviet union in 120℃-530℃; but the test of coal samples shows significant peak value between 300℃ - 320℃, especially the peak val- ues of coal samples after microwave radiation modification are more steep. Within the range of 180℃- 400℃, the thermal conductivity values of Gaoping anthracite ＂after microwave radiation modification are higher than the raw coal sample, the highest peak is 2. 5 times than the raw coal sample, and appea- ring the trough is put off than the raw coal sample; After 450℃, microwave radiation modification the thermal conductivities of coal samples after microwave radiation modification present a increasing tend- ency. But the changes of three kinds of condition of the thermal conductivity of Hailaer lignite are in basically the same with temperature, within 580℃, the growth advantages of coal samples which dried by flue gas after microwave radiation modification is highlighted after 480℃. The experiment proved that the thermal conductivity of coal can be greatly increased by microwave radiation modification.
出处
《冶金能源》
2016年第1期58-62,共5页
Energy For Metallurgical Industry
关键词
准稳态法
热导率
微波辐照改性
无烟煤
褐煤
quasi- steady state method thermal conductivity microwave radiation modification anthracite lignite
