Method and apparatus for manufacturing solid fuel from raw material coal

Abstract

A raw material slurry in which a coal is mixed with a mixed oil containing a heavy oil and a solvent oil is subjected to a water vaporization treatment with a vaporizer, and is subjected to solid-liquid separation with a mechanical solid-liquid separator. A separated solid is heated with a dryer while a carrier gas is flown, so as to vaporize the oil and produce a solid fuel. The carrier gas is fed to a cooler through a pipe, and the above-described vaporization oil is condensed and recovered. In a method and an apparatus for manufacturing a solid fuel, an occurrence of blocking in a pipe between the above-described dryer and the cooler can be prevented. An oil is flown on an inner wall surface of the pipe in the neighborhood of a cooler inlet portion with respect to the pipe between the dryer and the cooler.

1 . A method for manufacturing a solid fuel from a raw material coal, the method comprising the steps of: 
 mixing the coal into a mixed oil containing a heavy oil and a solvent oil to prepare a raw material slurry;    heating the raw material slurry to vaporize water;    subjecting the resulting raw material slurry in a vaporizer to solid-liquid separation with a mechanical solid-liquid separator to obtain a separated solid;    heating the separated solid in a dryer while a carrier gas is flown, so as to vaporize the oil and produce a solid fuel; and    cooling the carrier gas from the dryer in a cooler to recover oil in the carrier gas,    wherein an oil is flown in the neighborhood of a cooler inlet portion of a pipe for introducing the carrier gas into the cooler.    
   
   
       2 . The method for manufacturing a solid fuel according to  claim 1 , wherein at least one type of: 
 the oil condensed in the cooler;    the oil separated by the solid-liquid separation with the mechanical solid-liquid separator; and    the oil condensed and recovered with the cooler is used as the oil to be flown into the pipe for introducing the carrier gas into the cooler.    
   
   
       3 . The method for manufacturing a solid fuel according to  claim 1  or  claim 2 , wherein the oil recovered with the cooler is introduced from an upper portion of the cooler, so as to be brought into contact with the carrier gas.  
   
   
       4 . The method for manufacturing a solid fuel according to any one of  claims 1  to  3 , wherein the oil recovered with the cooler is used as a part of the oil to be mixed with the coal in the preparation of the raw material slurry.  
   
   
       5 . An apparatus for manufacturing a solid fuel, the apparatus comprising: 
 a vaporizer for heating a raw material slurry prepared by mixing a coal into a mixture containing a heavy oil and a solvent oil to vaporize water;    a mechanical solid-liquid separator for subjecting the raw material slurry to obtain a separated solid, from which water has been vaporized, to mechanical solid-liquid separation;    a dryer for heating the separated solid while a carrier gas is flown, so as to vaporize the oil; and    a cooler for cooling the carrier gas from the dryer, so as to recover oil in the carrier gas,    wherein a device for flowing an oil in the neighborhood of a cooler inlet portion of a pipe for introducing the carrier gas into the cooler is included.    
   
   
       6 . The apparatus for manufacturing a solid fuel according to  claim 5 , wherein the device for flowing the oil into the pipe comprises: 
 an oil inflow pipe connected to an upper side wall of the pipe; and    a device for supplying the oil to the oil inflow pipe.    
   
   
       7 . The apparatus for manufacturing a solid fuel according to  claim 6 , wherein the device for supplying the oil to the oil inflow pipe supplies the oil condensed in the cooler to the oil inflow pipe.  
   
   
       8 . The apparatus for manufacturing a solid fuel according to  claim 6 , wherein the device for supplying the oil to the oil inflow pipe is connected to the oil inflow pipe and an upper portion of the cooler.