Fuel system and process for its production for environmental protective energetic use of urban sewage sludge

Abstract

The present invention relates to a fuel system and to a process for the production of such a fuel system by using urban sewage sludge. Environment protective energetic use of urban sewage sludge and the reduction of fossil Carbon dioxide are the important goals. The fuel system according to the present invention shows a content of fossil carbon which is clearly reduced compared to that of fossil fuels while the fuel-technological properties are the same. Thus the emission of the carbon dioxide based on fossil carbon is notably reduced during the use of the fuel system according to the invention. In one embodiment of the process according to the invention, the fuel system according to the invention is provided consisting of different fossil regular fuels and urban sewage sludge as biogenic carbon donor, with biomasses serving as a biogenic carbon donor.

1 - 12 . (canceled) 
     
     
         13 . A fuel system comprising:
 a fuel mixture comprising at least two different fossil regular fuels; and   urban sewage sludge as a biogenic carbon donor,   wherein the urban sewage sludge comprises at least about 10% by weight of a total mass of the fuel system.   
     
     
         14 . The fuel system of  claim 13 , wherein the at least two fossil regular fuels are chosen from brown coal, black coal, anthracite, and combinations thereof. 
     
     
         15 . The fuel system of  claim 13 , wherein a first fossil regular fuel has a mean random vitrinite reflectance of greater than 2.0, and a second fossil regular fuel has a mean random vitrinite reflectance ranging from 0.4 to 2.0. 
     
     
         16 . The fuel system of  claim 13 , wherein the fuel system comprises at least three different fossil regular fuels. 
     
     
         17 . The fuel system of  claim 16 , wherein a first fossil regular fuel has a mean random vitrinite reflectance of greater than 3.0, a second fossil regular fuel has a mean random vitrinite reflectance ranging from 2.0 to 3.0, and a third fossil regular fuel has a mean random vitrinite reflectance ranging from 0.4 to 2.0. 
     
     
         18 . The fuel system of  claim 13 , wherein a composition balance index of each of the fossil regular fuels ranges from 2.0 to 5.0. 
     
     
         19 . The fuel system of  claim 13 , wherein a composition balance index of each of the fossil regular fuels ranges from to 2.5 to 4.5. 
     
     
         20 . The fuel system of  claim 13 , wherein the urban sewage sludge is a product of anaerobic digestion of raw sludge. 
     
     
         21 . The fuel system of  claim 13 , wherein the urban sewage sludge is raw sludge from a sedimentation tank and/or a settling tank of an urban sewage plant. 
     
     
         22 . The fuel system of  claim 13 , further comprising a refinement product chosen from coke, petroleum coke, brown coal coke, and charcoal. 
     
     
         23 . A process for producing a fuel system, the process comprising:
 selecting a first fossil regular fuel having a low content of volatile matters and a mean random vitrinite reflectance of greater than 2.0;   selecting a second fossil regular fuel having a medium content of volatile matters and a mean random vitrinite reflectance ranging from 0.4 to 2.0;   mixing the first fossil regular fuel and the second fossil regular fuel together to form a fossil regular fuel mixture; and   mixing the fossil regular fuel mixture with an urban sewage sludge,   wherein the urban sewage sludge is at least about 10% by weight of a total mass of the fuel system.   
     
     
         24 . The process of  claim 23 , wherein the fossil regular fuel mixture is mixed with the urban sewage sludge after the urban sewage sludge is putrefied, drained, and dried. 
     
     
         25 . The process of  claim 23 , wherein the fossil regular fuel mixture is mixed with the urban sewage sludge before the urban sewage sludge is putrefied, drained, and dried. 
     
     
         26 . The process of  claim 23 , wherein each of the fossil regular fuels is selected to provide the fossil regular fuel mixture with a composition balance index ranging from 2.0 to 5.0. 
     
     
         27 . The process of  claim 23 , wherein each of the fossil regular fuels is selected to provide the fossil regular fuel mixture with a composition balance index ranging from 2.5 to 4.5. 
     
     
         28 . A process for producing a fuel system, the process comprising:
 selecting a first fossil regular fuel having a low content of volatile matters and a mean random vitrinite reflectance of greater than 2.0;   selecting a second fossil regular fuel having a medium content of volatile matters and a mean random vitrinite reflectance ranging from 0.4 to 2.0;   mixing one of the selected first or second fossil regular fuels with an urban sewage sludge to obtain a fuel mixture; and   mixing the other selected first or second fossil regular fuel with the fuel mixture,   wherein the urban sewage sludge is at least about 10% by weight of a total mass of the fuel system.   
     
     
         29 . The process of  claim 28 , wherein one of the selected first or second fossil regular fuels is mixed with the urban sewage sludge after the urban sewage sludge is putrefied, drained, and dried. 
     
     
         30 . The process of  claim 28 , wherein one of the selected first or second fossil regular fuels is mixed with the urban sewage sludge before the urban sewage sludge is putrefied, drained, and dried.