| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for reforming coal wherein a mixed vapor fed to a compressor can be purified in a process for dehydrating low-grade coal with a high water content and resultantly a low calorific value in an oil, and thereby reforming the low-grade coal into a fuel having a high calorific value for thermal power generation. SOLUTION: The method for reforming the coal comprises pulverizing the low-grade coal, mixing the pulverized low-grade coal with the oil, forming slurry, heating the slurry at the boiling point of water or above, thereby evaporating moisture contained in the low-grade coal, dehydrating the coal, compressing the mixed vapor comprising steam produced by heating the slurry and a part of oil simultaneously vaporized, thereby heating and pressurizing the mixed vapor, and utilizing the mixed vapor heated and pressurized by the compression as a high-temperature heat source for heating the slurry. In the method, the mixed vapor before the compression is brought into contact with the oil in a liquid state. COPYRIGHT: (C)2010,JPO&INPIT |
