Modular hybrid plasma gasifier for use in converting combustible material to synthesis gas

A plasma gasifier, comprising:

• a first plasma unit having access ports, said first plasma unit defining a first internal plasma zone therein, wherein said first internal plasma zone is accessible through said access ports;
• electrode assemblies that extend into said access ports, wherein each of said electrode assemblies includes;
• an electrode base that receives electrical current;
• a conductive tube in contact with said electrode base that conducts said electrical current;
• a tubular support jacket that extends from said conductive tube, wherein said conductive tube and said tubular support jacket define an internal compartment that is actively cooled by flowing coolant;
• an electrode tip supported by said tubular support jacket and cooled by said flowing coolant in said internal compartment, wherein said electrode tip extends into said first internal plasma zone to an insertion depth, and wherein each said electrode tip receives said electrical current through each said tubular support jacket;
• an insulator that surrounds at least a portion of said conductive tube and said tubular support jacket;
• and
• a gas conduit for a supplied working gas disposed between said insulator and at least a portion of said tubular support jacket.