Solid fuel manufacturing method and manufacturing device

Abstract

A method and device manufacturing solid fuel, the method includes: mixing porous coal with a mixture oil containing solvent oil and heavy oil, to obtain material slurry; heating the material slurry to promote dehydration of porous coal and impregnating the mixture oil into pores of porous coal, to obtain dehydrated slurry; separating upgraded porous coal and the mixture oil from the dehydrated slurry; drying the upgraded porous coal by heating and conveying it while supplying carrier gas; setting a target value of the circulation amount of carrier gas and a target value of the pressure of carrier gas at the drying; calculating control outputs, based on deviations between the target values and measured values corresponding respectively thereto; and adjusting the supply amount of carrier gas, based on a smaller value between the control outputs obtained.

1 : A method of manufacturing solid fuel comprising:
 mixing porous coal with a mixture oil containing solvent oil and heavy oil, to obtain material slurry;   heating the material slurry to promote dehydration of porous coal and impregnating the mixture oil into pores of porous coal, to obtain dehydrated slurry;   separating upgraded porous coal and the mixture oil from the dehydrated slurry;   drying the upgraded porous coal by heating and conveying it while supplying carrier gas;   setting a target value of the circulation amount of carrier gas and a target value of the pressure of carrier gas at the drying;   calculating control outputs, based on deviations between the target values and measured values corresponding respectively thereto; and   adjusting the supply amount of carrier gas, based on a smaller value between the control outputs obtained.   
     
     
         2 : The method of manufacturing solid fuel according to  claim 1 , wherein
 the target values are each decided based on the supply amount of upgraded porous coal to be dried at the drying and on the amount of oil contained in upgraded porous coal subjected to the drying.   
     
     
         3 : The method of manufacturing solid fuel according to  claim 2 , wherein
 the target values are each decided such that the pressure of carrier gas at the drying lies within a preset range.   
     
     
         4 : A device for manufacturing solid fuel comprising:
 a mixing vessel that mixes porous coal with a mixture oil containing solvent oil and heavy oil, to obtain material slurry;   an evaporator that heats the material slurry to promote dehydration of porous coal and that impregnates the mixture oil into pores of porous coal, to obtain dehydrated slurry;   a centrifuge that separates upgraded porous coal and the mixture oil from the dehydrated slurry;   a dryer that dries the upgraded porous coal by heating and conveying it while supplying carrier gas; and   a controller that sets a target value of the circulation amount of carrier gas and a target value of the pressure of carrier gas in the dryer, that calculates control outputs, based on deviations between the target values and measured values corresponding respectively thereto, and that adjusts the supply amount of carrier gas, based on a smaller value between the control outputs obtained.   
     
     
         5 : The device for manufacturing solid fuel according to  claim 4 , wherein
 the controller decides the target values, each based on the supply amount of upgraded porous coal to be dried in the dryer and on the amount of oil contained in upgraded porous coal leaving the dryer.   
     
     
         6 : The device for manufacturing solid fuel according to  claim 5 , wherein
 the controller decides each of the target values such that the pressure of carrier gas at a drying operation in the dryer lies within a preset range.