【摘要】：為了分析煤階對液氮冷凍致裂效果的影響,對高階無煙煤和中階焦煤開展了液氮冷凍試驗(yàn),利用超聲波測試儀測試液氮冷凍致裂前后的波速變化,分析了煤階、飽水對液氮冷凍效果的影響。結(jié)果表明:無煙煤飽水后波速下降,焦煤飽水后波速增長;對于干燥煤樣,液氮作用后無煙煤的損傷程度要比焦煤的損傷程度嚴(yán)重;飽水煤樣液氮冷凍致裂效果更好;飽水無煙煤液氮作用后,波速平均下降19.8%;飽水焦煤液氮冷凍致裂作用后,波速平均下降27.6%;在飽和狀態(tài)下,液氮作用后焦煤的損傷程度比無煙煤更顯著。
[Abstract]:In order to analyze the effect of coal rank on cryogenic cracking effect of liquid nitrogen, liquid nitrogen freezing tests were carried out on high-order anthracite and middle rank coking coal. The changes of wave velocity before and after freezing cracking of liquid nitrogen were measured by ultrasonic testing instrument, and the coal rank was analyzed. The effect of saturated water on the freezing effect of liquid nitrogen. The results show that the wave velocity of anthracite decreases after saturation, the wave velocity of coke increases after saturation, the damage degree of anthracite treated with liquid nitrogen is more serious than that of coking coal, the cracking effect of frozen liquid nitrogen of saturated coal is better than that of coking coal. The wave velocities of saturated anthracite decreased by 19.8m after liquid nitrogen treatment, and by 27.6m after freezing cracking of saturated coking coal. Under saturated condition, the damage degree of coking coal after liquid nitrogen treatment was more significant than that of anthracite.
【作者單位】： 河北科技大學(xué)建筑工程學(xué)院;遼寧工程技術(shù)大學(xué)力學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51574139,51274079,51474121)
【分類號】：TD712.6
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本文編號：2408527