# US 5,716,205 A · Rotatable heating chamber for solid material > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,716,205 A - Document ID: US5716205A - Status: Granted - Kind: A - Application number: 08/610,520 - Filed: 1996-03-04 - Granted: 1998-02-10 - Earliest claimed: 1993-09-03 - Assignees: Siemens Aktiengesellschaft - Inventors: Herbert Tratz - Web page: https://patentgrep.com/patent/US5716205A ## CPC - C10B 53/00: Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form (wet carbonising of peat C10F) - C10B 47/30: in rotary ovens or retorts - F23G 2205/121: Screw conveyor - F23G 2900/50201: Waste pyrolysis, gasification or cracking by indirect heat transfer - F23G 2900/52001: Rotary drums with co-current flows of waste and gas - C10B: DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS (cracking oils C10G; underground gasification of minerals E21B43/295) - F23G: CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION ## Abstract A heating chamber for solid material, preferably a low-temperature carbonization drum for waste, is rotatable about its longitudinal axis and is equipped with a number of heating tubes that are disposed in an interior space and are aligned approximately parallel to one another. In order to ensure that only fine material can collect between the heating tubes and the inner wall surface of the heating chamber, the heating tubes, as viewed in cross-section, are disposed in a virtually closed row along the wall. Dummy tubes which are preferably easy to remove and preferably have the same diameter as the heating tubes, are located in this row, which may be circular. ## Claims ### Claim 1 A heating chamber for solid waste material, comprising: a wall defining an interior space and a longitudinal axis about which the heating chamber is rotatable; and a number of heating tubes being disposed along said wall in said interior space as seen in cross section of said interior space, said heating tubes being aligned approximately parallel to one another and having a given diameter, said heating tubes along said wall being spaced apart from each other by a spacing being less than half of said given diameter, said spacing being in a range of between 20 and 40 mm, and said heating tubes along said wall being spaced apart from said wall by a spacing being less than half of said given diameter for protecting said wall from being damaged by lumps of solid waste material when the heating chamber is rotated. ### Claim 2 (depends on 1) The heating chamber according to claim 1, wherein said spacing of said heating tubes from said wall is between 20 mm and 40 mm. ### Claim 3 (depends on 1) The heating chamber according to claim 1, including easily removable dummy tubes in place of some of said heating tubes. ### Claim 4 (depends on 3) The heating chamber according to claim 3, wherein said dummy tubes have the same diameter as said heating tubes. ### Claim 5 (depends on 1) The heating chamber according to claim 1, including additional heating tubes in said interior space being disposed in non-radial rows, each of said rows beginning a short distance from said wall and extending into said interior space. ### Claim 6 (depends on 5) The heating chamber according to claim 5, wherein the heating chamber rotates in a given direction, and each of said rows of said additional heating tubes is curved counter to said given direction of rotation, as seen from said wall into said interior. ### Claim 7 (depends on 5) The heating chamber according to claim 5, wherein the heating chamber rotates in a given direction, and each of said rows of said additional heating tubes is disposed along a straight line and is inclined counter to said given direction of rotation, as seen from said wall into said interior. ### Claim 8 (depends on 5) The heating chamber according to claim 5, wherein said rows include longer and shorter non-radial rows in said interior space. ### Claim 9 (depends on 6) The heating chamber according to claim 6, wherein said rows include longer and shorter non-radial rows in said interior space. ### Claim 10 (depends on 7) The heating chamber according to claim 7, wherein said rows include longer and shorter non-radial rows in said interior space. ### Claim 11 A heating chamber for solid waste material, comprising: a wall defining an interior space and a longitudinal axis about which the heating chamber is rotatable; a number of heating tubes being disposed along said wall in said interior space as seen in cross section of said interior space, said heating tubes being aligned approximately parallel to one another and having a given diameter, said heating tubes being spaced apart from each other by a spacing being less than half of said given diameter, and said heating tubes being spaced apart from said wall by a spacing being less than half of said given diameter; and shields disposed on said heating tubes disposed along said wall for protection against damage. ### Claim 12 A low-temperature carbonization drum for waste, comprising: a wall defining an interior space and a longitudinal axis about which the heating chamber is rotatable; and a number of heating tubes being disposed along said wall in said interior space as seen in cross section of said interior space, said heating tubes being aligned approximately parallel to one another and having a given diameter, said heating tubes along said wall being spaced apart from each other by a spacing being less than half of said given diameter, said spacing being in a range of between 20 and 40 mm, and said heating tubes along said wall being spaced apart from said wall by a spacing being less than half of said given diameter for protecting said wall from being damaged by lumps of solid waste material when the heating chamber is rotated.