Environmentally friendly and high efficiency solid fuel production method using high-water-content organic waste, and combined heat and power system using same

Abstract

The present invention relates to an environmentally friendly and high efficiency solid fuel production method using high-water-content organic waste, and, more specifically, relates to a solid fuel production method using high-water-content organic waste, the method comprising: (a) a waste mixing step in which high-water-content organic waste and municipal waste are introduced into a Fe-based reactor and mixed; (b) a hydrolysis step in which high temperature steam is added to the reactor and the mixture of organic waste and municipal waste is placed under pressure and is then stirred in the pressurized state so as to hydrolyse the mixture; (c) a pressure-reducing step in which the steam in the reactor is discharged and the inside of the reactor is rapidly reduced in pressure and left to stand in such a way as to give the organic waste from step (b) a low molecular weight or in such a way as to enlarge the specific surface area of the municipal waste from step (b) and thereby break apart same; (d) a vacuum or differential pressure step in which the reactor is placed under vacuum or differential pressure, and the water content of the reaction product from step (c) is removed; and (e) a solid-fuel forming step in which the reaction product from step (d) is subjected to natural drying and compression moulding so as to produce a solid fuel having a water content of between 10 and 20%.

1 . An environmentally friendly and high efficiency solid fuel production method using a high-water-content organic waste, comprising:
 (a) a waste mixing step where a high-water-content organic waste and a municipal solid waste are inputted and mixed in a Fe-based reactor;   (b) a hydrolysis step where a mixture of the organic waste and the municipal solid waste is pressurized by adding high temperature vapor into the reactor and is agitated in the pressurized state for thereby hydrolyzing the mixture;   (c) a depressurization step where the reactor is controlled to remain in normal state after the interior of the reactor is suddenly depressurized by discharging the vapor from the interior of the reactor, and the mixture is crushed by depolymerizing the organic waste treated through the step (b) or by increasing the specific surface area of the municipal solid waste treated through the step (b);   (d) a vacuum or differential pressure step where water is eliminated from the reactant treated through the step (c) by providing the vacuum or differential pressure condition to the reactor; and   (e) a solid fuel preparation step where a solid fuel of which the water content is 10˜20% is prepared by naturally drying the reactant treated through the step (d).   
     
     
         2 . The method of  claim 1 , wherein in the step (a), the high-water-content waste is one or more than one waste selected from the wastes of livestock excrements, sewage sludgy and food waste and contains the water content of more than 80%, and the municipal solid waste contains paper and plastics. 
     
     
         3 . The method of  claim 2 , wherein in the step (a), the high-water-content waste and the municipal solid waste are inputted at a ratio of 3.5˜4:0.5˜1 and are mixed. 
     
     
         4 . The method of  claim 2 , wherein in the step (a), the high-water-content waste and the municipal solid waste are inputted at a filling ratio of 70˜90% into the Fe-based reactor and are mixed. 
     
     
         5 . The method of  claim 1 , wherein in the step (b), the mixture of the organic waste and the municipal solid waste is pressurized so that the internal pressure of the reactor becomes 20˜25 atm by adding the vapor of 200˜250° C. to the reactor using a boiler connected to the reactor. 
     
     
         6 . The method of  claim 1 , wherein in the step (c), the pressure is suddenly depressurized for the atmosphere to become 0.9˜1.1 atm by discharging the vapor from the interior of the reactor for 10˜120 seconds. 
     
     
         7 . The method of  claim 1 , wherein in the step (d), the vacuum or differential pressure condition is provided to the reactor for 1015 minutes using a vacuum pump connected to the reactor for thereby eliminating 5˜10% of the water from the reactant treated through the step (c). 
     
     
         8 . The method of  claim 1 , wherein the solid fuel prepared in the step (e) has a low calorific power of above 5,000 kcal/kg. 
     
     
         9 . A combined heat and power system characterized in that electricity is generated using superheated vapor produced by supplying the solid fuel to a reactor wherein the solid fuel is produced by the method of  claim 1 . 
     
     
         10 . A combined heat and power system characterized in that electricity is generated using superheated vapor produced by supplying the solid fuel to a reactor wherein the solid fuel is produced by the method of  claim 2 . 
     
     
         11 . A combined heat and power system characterized in that electricity is generated using superheated vapor produced by supplying the solid fuel to a reactor wherein the solid fuel is produced by the method of  claim 3 . 
     
     
         12 . A combined heat and power system characterized in that electricity is generated using superheated vapor produced by supplying the solid fuel to a reactor wherein the solid fuel is produced by the method of  claim 4 . 
     
     
         13 . A combined heat and power system characterized in that electricity is generated using superheated vapor produced by supplying the solid fuel to a reactor wherein the solid fuel is produced by the method of  claim 5 . 
     
     
         14 . A combined heat and power system characterized in that electricity is generated using superheated vapor produced by supplying the solid fuel to a reactor wherein the solid fuel is produced by the method of  claim 6 . 
     
     
         15 . A combined heat and power system characterized in that electricity is generated using superheated vapor produced by supplying the solid fuel to a reactor wherein the solid fuel is produced by the method of  claim 7 . 
     
     
         16 . A combined heat and power system characterized in that electricity is generated using superheated vapor produced by supplying the solid fuel to a reactor wherein the solid fuel is produced by the method of  claim 8 .