Pyrolysis processing of solid waste from a water treatment plant

Abstract

The present invention provides methods and apparatus for treating waste, such as municipal waste via pyrolysis and yielding one or more of heat energy; electrical energy and fuel. In some embodiments, waste feed stock can be municipal waste in black bag form. In some the present invention additionally provides for processing of hundreds of tons of municipal waste each day.

What is claimed is: 
     
         1 . A method of generating electricity for an electrical grid using solid waste, the method comprising:
 conveying said waste from a water treatment plant comprising one or both of inorganic material and organic material into a pre-conditioner unit;   exposing the waste to an environment of saturated steam;   heating the environment of saturated steam containing the waste to a temperature of 160° C. or more;   following the exposing of the waste to an environment of saturated steam, pyrolysizing the waste as a result of heating of the waste in an retort comprising multiple heat radiant tubes providing increased retention time of the waste in the retort and heat distribution within the retort, the retort comprising an environment depleted of oxygen and maintained at about 700° C. or more;   producing hot synthetic gas via the pyrolysizing of the waste;   discharging the hot synthetic gas by product via ports from the retort into a gas turbine, wherein the gas turbine is in mechanical connection with an electrical grid;   driving the turbine with the hot synthetic gas to generate electricity; and   distributing the generated electricity across the electrical grid.   
     
     
         2 . The method of  claim 1  wherein the organic material comprises one or more of:
 cellulosic flakes, wood and textiles. 
 
     
     
         3 . The method of  claim 1  wherein the inorganic material comprises one or both of aluminum and magnetic metals. 
     
     
         4 . The method of  claim 1  wherein the step of pyrolysizing the waste from the water treatment plant additionally comprises passing the waste from the water treatment plant through a retort comprising a heated multi-zoned pyrolysis muffle chamber. 
     
     
         5 . The method of  claim 4  additionally comprising the step of providing heat through radiant tubes within the multi-zoned pyrolysis muffle chamber. 
     
     
         6 . The method of  claim 5 , wherein the heat provided through the radiant tubes promotes pyrolysis of the waste from the water treatment plant. 
     
     
         7 . The method of  claim 6  additionally comprising the step of generating synthetic gas as a result of the pyrolysis of the waste from the water treatment plant. 
     
     
         8 . The method of  claim 7  additionally comprising the step of passing the synthetic gas through gas take off ports in gaseous communication with the multi-zoned pyrolysis muffle chamber. 
     
     
         9 . The method of  claim 8  additionally comprising the step of cooling said synthetic gas in a cooling chamber. 
     
     
         10 . The method of  claim 9  additionally comprising the step of cooling the cooling chamber via circulation of a coolant in thermal communication with said cooling chamber. 
     
     
         11 . The method of  claim 10  wherein said coolant comprises an aqueous solution. 
     
     
         12 . The method of  claim 11 , additionally comprising the step of scrubbing the synthetic gas via a gas scrubber. 
     
     
         13 . The method of  claim 12  additionally comprising the step of conveying condensed tar and oil to a collector, wherein the condensed tar and oil result from placing organic material in the pyrolysis chamber. 
     
     
         14 . The method of  claim 1 , wherein the turbine powers an electrical generator.