Hydrothermal Treatment of Brown Coal To Improve the Space Time Yield of a Direct Liquefaction Reactor
| Autor: | Motoharu Yasumuro, Kaoru Masuda, Toshinori Inoue, Osamu Okuma, Kouichi Miura |
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| Rok vydání: | 2012 |
| Předmět: |
Yield (engineering)
business.industry General Chemical Engineering technology industry and agriculture Energy Engineering and Power Technology chemistry.chemical_element Liquefaction respiratory system medicine.disease complex mixtures respiratory tract diseases Viscosity Fuel Technology Chemical engineering chemistry Volume (thermodynamics) otorhinolaryngologic diseases Chlorine Slurry medicine Coal Dehydration business |
| Zdroj: | Energy & Fuels. 26:2198-2203 |
| ISSN: | 1520-5029 0887-0624 |
| DOI: | 10.1021/ef300095s |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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