Patent ID: 8758602
Filing Date: 2014-06-24
Classification: C10G,C10L

Abstract:
1. A process for upgrading coal comprising: pulverizing low-grade coal; mixing the pulverized low-grade coal with an oil to form a slurry; heating the slurry to or above the boiling point of water so that water contained in the low-grade coal is evaporated, the slurry is dewatered, and a vapor mixture comprising water vapor and a part of the oil vaporized is formed; spraying a part of the oil in a liquid state to be in contact with the vapor mixture to cause coalescence and growth of bubbles in the vapor mixture to promote separation of gaseous and liquid phases of the vapor mixture; compressing the vapor mixture after spraying the part of the oil in the liquid state to elevate the temperature and pressure of the vapor mixture; and using the vapor mixture in which temperature and pressure are increased by the compression as a high-temperature heat source for heating the slurry, wherein at least most of the part of the oil in the liquid state is composed of liquid oil.