本文選題：熱提質(zhì) + 褐煤��； 參考：《化工學(xué)報(bào)》2017年10期

【摘要】：針對(duì)不同溫度熱提質(zhì)褐煤新鮮樣及其自然環(huán)境中儲(chǔ)存一定時(shí)間后的預(yù)氧化樣,利用訂制的自燃測(cè)定實(shí)驗(yàn)裝置測(cè)得各樣品的自燃傾向性差異,采用X-band電子自旋共振波譜儀進(jìn)行自由基動(dòng)態(tài)原位分析,研究預(yù)氧化對(duì)熱提質(zhì)褐煤自燃特性的影響。結(jié)果表明,熱提質(zhì)溫度升高,新鮮樣的自燃傾向性降低。但隨著儲(chǔ)存時(shí)間延長(zhǎng),105~500℃熱提質(zhì)褐煤發(fā)生預(yù)氧化,自燃傾向性不同程度地增加,400℃熱提質(zhì)后的預(yù)氧化樣與原煤一樣易自燃。在自燃氧化過程中,與新鮮樣不同,預(yù)氧化樣的吸氧量增加,自由基濃度也增加。預(yù)氧化不僅使熱提質(zhì)褐煤自由基增加;且在自燃的加速氧化階段后期,不斷產(chǎn)生自由基,維持氧化自熱升溫。而400℃熱提質(zhì)褐煤新鮮樣在自燃氧化初期消耗大量小分子自由基,損失達(dá)80%,因不能持續(xù)產(chǎn)生活性自由基難以維持自燃氧化反應(yīng)進(jìn)行。
[Abstract]:In view of the preoxidation samples of fresh lignite samples at different temperatures and their natural environment after storage for a certain time, the self-ignition tendency of each sample was measured by using a self-ignition experimental device. The effect of preoxidation on the spontaneous combustion of heat-extracted lignite was studied by using X-band electron spin resonance spectrometer. The results showed that the autoignition tendency of the fresh samples decreased with the increase of the temperature. However, with the prolongation of storage time, preoxidation occurs at 500 鈩，

本文編號(hào)：2017165