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Title: Method and system including a double rotary kiln pyrolysis or gasification of waste material

A method of destructively distilling an organic material in particulate form wherein the particulates are introduced through an inlet into one end of an inner rotating kiln ganged to and coaxial with an outer rotating kiln. The inner and outer kilns define a cylindrical annular space with the inlet being positioned in registry with the axis of rotation of the ganged kilns. During operation, the temperature of the wall of the inner rotary kiln at the inlet is not less than about 500.degree. C. to heat the particulate material to a temperature in the range of from about 200.degree. C. to about 900.degree. C. in a pyrolyzing atmosphere to reduce the particulate material as it moves from the one end toward the other end. The reduced particulates including char are transferred to the annular space between the inner and the outer rotating kilns near the other end of the inner rotating kiln and moved longitudinally in the annular space from near the other end toward the one end in the presence of oxygen to combust the char at an elevated temperature to produce a waste material including ash. Also, heat is provided which is transferred to the inner kiln. Themore » waste material including ash leaves the outer rotating kiln near the one end and the pyrolysis vapor leaves through the particulate material inlet.« less
Inventors:
 [1];  [2]
  1. (Bolingbrook, IL)
  2. (Naperville, IL)
Issue Date:
OSTI Identifier:
871125
Assignee:
United States Department of Energy (Washington, DC) ANL
Patent Number(s):
US 5662052
Contract Number:
W-31109-ENG-38
Research Org:
Argonne National Laboratory (ANL), Argonne, IL
Country of Publication:
United States
Language:
English
Subject:
method; including; double; rotary; kiln; pyrolysis; gasification; waste; material; destructively; distilling; organic; particulate; form; particulates; introduced; inlet; inner; rotating; ganged; coaxial; outer; kilns; define; cylindrical; annular; space; positioned; registry; axis; rotation; operation; temperature; wall; 500; degree; heat; range; 200; 900; pyrolyzing; atmosphere; reduce; moves; reduced; char; transferred; near; moved; longitudinally; presence; oxygen; combust; elevated; produce; ash; provided; leaves; vapor; rotary kiln; rotating kiln; particulate material; waste material; elevated temperature; particulate form; material including; organic material; annular space; particulates including; kiln pyrolysis; /110/432/