Hydrothermal Treatment of Brown Coal To Improve the Space Time Yield of a Direct Liquefaction Reactor
Hydrothermal Treatment of Brown Coal To Improve the Space Time Yield of a Direct Liquefaction Reactor
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DOI：
10.1021/ef300095s
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发表时间：
2012-04
期刊：
影响因子：
5.3
通讯作者：
Toshinori Inoue;O. Okuma;K. Masuda;M. Yasumuro;K. Miura
中科院分区：
文献类型：
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作者：
Toshinori Inoue;O. Okuma;K. Masuda;M. Yasumuro;K. Miura
考察了褐煤在200-350 °C下水热处理（HTT）作为用于提高维多利亚褐煤液化反应器时空产率的预处理方法的可能性。在低于350 °C的高温处理过程中，主要发生脱羧和脱水反应，大部分羧基被分解。褐煤中的钠和氯在HTT期间分别在低于250和300 °C下几乎完全去除。褐煤中约20-30%的Ca和Mg也通过低于350 °C的HTT去除。由HTT煤制备的煤溶剂浆料的粘度小于由刚脱水的煤制备的煤溶剂浆料的粘度的1/3。这使得煤溶剂浆料的煤浓度从28重量%增加到40重量%。从HTT煤制备的煤溶剂浆的煤浓度的显着增加被发现主要是通过通过HTT煤颗粒的孔体积的减少来实现的。这些结果表明，HTT将是一种有效的预处理方法，不仅可以提高空时收率，但抑制结垢的褐煤液化过程。
The possibility of hydrothermal treatment (HTT) of brown coal at 200–350 °C was examined as a pretreatment method for improving the space time yield of a Victorian brown coal liquefaction reactor. Main reactions occurring during HTT below 350 °C were decarboxylation and dehydration, by which most of carboxylic groups were decomposed. Sodium and chlorine in the brown coal were almost completely removed below 250 and 300 °C, respectively, during HTT. Around 20–30% of Ca and Mg in the brown coal was also removed by HTT below 350 °C. The viscosity of the coal–solvent slurry prepared from a HTT coal was less than ¹/₁₀ of the viscosity of the coal–solvent slurry prepared from a just dewatered coal. This enabled the increase of the coal concentration of the coal–solvent slurry from 28 to 40 wt %. The significant increase of the coal concentration of the coal–solvent slurry prepared from the HTT coal was found to be realized mainly by the decrease of the pore volume of the coal particles through HTT. These results suggest that HTT will be a pretreatment method effective not only to increase the space time yield but to suppress the scale formation of the brown coal liquefaction process.