熱解氣氛與溫度對褐煤半焦“一步法”甲烷化活性的影響
[Abstract]:In order to improve the utilization efficiency of semi-coke in the co-production technology of lignite pyrolysis, the low-temperature pyrolysis semi-coke was used to produce methane by one-step process. The effects of pyrolysis conditions on the properties of semi-coke and the activity of one-step methanation were investigated. Pyrolysis semi-coke of lignite at different atmosphere and temperature was prepared by tube furnace. The surface chemistry, microcrystal structure and methanation activity of semi-coke were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and fixed-bed reactor. The results showed that, compared with N2 and H2 atmosphere, lignite pyrolysis in steam atmosphere resulted in higher content of oxygen-containing functional groups on the surface of semicoke, lower graphitization degree and higher methanization activity than those in N2 and H2 atmospheres. In water vapor atmosphere, with the increase of pyrolysis temperature, the degree of lignite pyrolysis deepened, the number of oxygen-containing functional groups on the surface of semi-coke decreased and the graphitization degree increased, resulting in a decrease in methanation activity. In conclusion, a lignite semi-coke with the best methanation activity was formed at 773K in steam atmosphere, which is of great guiding significance for the optimization of co-production of low-order lignite pyrolysis process and gasification process.
【作者單位】: 青島科技大學化工學院清潔化工過程山東省高校重點實驗室;
【基金】:國家自然科學基金(21276129,51506105) 山東省自然科學基金重點項目(ZR2015QZ02) 山東省自然科學基金(ZR2015BL028)項目
【分類號】:TD849.2
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