富氢气氛下煤热解脱硫脱氮的研究

本文对兖州高硫煤在１０ｍｌ固定床反应器中分别与相当条件下的焦炉煤气、合成气、氢气共热解所得半焦及焦油元素进行系统的分析比较。结果表明，在压力为３ＭＰａ，温度为６５０℃，升温速率为１０℃／ｍｉｎ相对温和的热解条件下，兖州高硫煤与焦炉气、合成气、氢气共热解脱氮率分别为３０１％、３５７％、４４０％（ｗ％，ａｄ），脱硫率基本相当约为８０％（ｗ％，ａｄ），且在此三种热解气氛下煤中硫在热解固、液、气产物中的分布极为相似，分别约为２０％、１０％、７０％。与相当氢分压下的纯氢加氢热解相比，５ＭＰａ焦炉气气氛下兖州煤热解脱硫率增加约４５％，脱氮率降低约３５％。用焦炉气顶替纯氢气进行煤加氢热解具有较大的脱硫优势，这不失为我国高硫煤洁净利用的新途径

DESULFURIZATION AND DENITROGENATION INCOPYROLYSIS OF COAL WITH HYDROGEN-RICH GASES

The desulfurization and denitrogenation were systematically investigated by analyzing the chars and tars from copyrolysis of Yanzhou high sulfur bituminous coal with coke-oven gas (COG), synthesis gas (SG) and hydrogen The results indicated that at the conditions of 3MPa, upto 650 with a heating rate of 10/min, the desulfurization of coal pyrolysis with COG, SG adn hydrogen were almost equal (about 80% w%, ad), the order of denitrogenation were: hydrogen (41%)>SG(35%)>COG(30%) The distributions of sulfur in char, oil and gas was very similar under the three reactive gases, and ie, about 20% in char, 10% in tar and 70% (diff) in gas, respectively Compared with hydropyrolysis at the same hydrogen partial pressure, the desulfurization of coal pyrolysis with coke-oven gas increased about 45%, however, the denitrogenation decreased about 35% There is an improtant desulfurization advantage for hydropyrolysis using COG and SG instead of pure hydrogen Compared with the co-pyrolysis of coal with COG, Yanzhou coal pyrolysis under SG can reach the same desulfurization and higher denitrogenation