Waste processing system

Abstract

A small scale integrated waste processing system for the thermal destructions of waste. The system comprises a compactor ( 12 ) for densifying waste and expressing air, a pyrolyzer ( 13 ) to receive waste delivered from the compactor, a gasifier ( 14 ) with an ash vessel ( 23 ) that receives dried waste, and an oxidizer ( 15 ) receiving gas from the gasifier to be combusted. Heat energy from the oxidizer can be routed back to the pyrolyzer.

1 . A waste processing system comprising a compactor for densifying waste and expressing air, a pyrolyzer to receive waste delivered from said compactor, a gasifier receiving waste from said pyrolyzer, and an oxidizer receiving gas from the gasifier to be combusted. 
     
     
         2 . The waste processing system of  claim 1  wherein the pyrolyzer includes a screw and a feed tube, wherein said screw is arranged therethrough said feed tube. 
     
     
         3 . The waste processing system of  claim 1  wherein energy from an output gas of the oxidiser is used to provide heat to the pyrolyzer. 
     
     
         4 . The waste processing system of  claim 1  further comprising a heat reclaimer to process excess heat from the oxidizer. 
     
     
         5 . The waste processing system of  claim 4  wherein the heat reclaimer is an indirect heat exchanger. 
     
     
         6 . The waste processing system of  claim 4  wherein energy from the heat reclaimer is used for absorption chilling and/or air conditioning and/or refrigeration and/or space heating and/or process heating and/or distillation and/or desalination. 
     
     
         7 . The waste processing system of  claim 4  wherein energy from the heat reclaimer is used for electrical energy generation. 
     
     
         8 . The waste processing system of  claim 1  including an ash vessel to receive ash from the pyrolyzer or gasifier. 
     
     
         9 . The waste processing system of  claim 2  wherein the feed tube of the pyrolyzer is anchored to the gasifier to allow said feed tube to expand towards its free end. 
     
     
         10 . The waste processing system of  claim 9  further including a main pyrolyzer tube and an expansion gaiter, wherein the feed tube is inserted into said main pyrolyzer tube with a clearance and sealed by said expansion gaiter. 
     
     
         11 . The waste processing system of  claim 1  wherein the pyrolyzer operates at over 500° C. 
     
     
         12 . The waste processing system of  claim 1  wherein the oxidizer operates at over 850° C. 
     
     
         13 . The waste processing system of  claim 1  wherein the equipment parts of said system are housed within two ISO containers for mobility. 
     
     
         14 . A method of processing waste comprising densifying waste and expressing air therefrom in a compactor, delivering the waste from a compactor to a pyrolyzer, heating the waste for thermal decomposition of organic material by action of heat alone in the pyrolyzer, receiving waste from the pyrolyzer in a gasifier, gasifying waste in the gasifier, receiving the gas from the gasifier in an oxidiser, and oxidising the gas to be combusted. 
     
     
         15 . The method of  claim 14  including processing excess heat from the pyrolyzer in a heat reclaimer. 
     
     
         16 . The method of  claim 15  including using the energy from the heat reclaimer for a process selected from the group consisting of absorption chilling, air conditioning, refrigeration, space heating, process heating, distillation and desalination. 
     
     
         17 . The method of  claim 15  including using the energy from the heat reclaimer for electrical energy generation. 
     
     
         18 . The method of  claim 14  including operating the pyrolyzer at a temperature of over 500° C. 
     
     
         19 . The method of  claim 14  including operating the oxidiser at a temperature of over 850° C.