Patent ID: 8784650

Claim:
A multistage liquefying method of carbonaceous solid fuel, wherein said method comprising the following steps: 1) one or several kinds of carbonaceous solid fuels powder is mixed with heavy oil to make fuel-oil slurry, the fuel-oil slurry is subsequently dehydrated by heating at 150° C. to 200° C., and then partially liquefied by hydrogenation under a pressure of between 10 atm to less than 50 atm and a temperature of 350° C. to 450° C., then light oil components and a heavy oil-residue slurry are separated; 2) the light oil components from the step 1) are hydrorefined to yield refined oil; 3) the heavy oil-residue slurry from the step 1) is introduced into an oil-residue-slurry pressurized gasifier at a temperature of 100° C. to 400° C. to perform the gasification reaction with oxygen at a temperature of 1000° C. to 1800° C. to yield syngas, wherein the heating value of said heavy oil-residue slurry is in a range of 6000 kcal/kg to 9000 kcal/kg; 4) the syngas from the step 3) is treated by conventional process and then converted to F-T synthesis oil using conventional F-T synthesis process; and 5) the F-T synthesis oil from the step 4) is then hydrorefined and hydrocracked to produce refined oil, which is combined with the refined oil from the step 2), and then fractionated to yield high quality oil products including LPG, gasoline, aviation kerosene, diesel oil or other chemical products.