# US 11,029,025 B2 · Combustible waste injection device and method for operating the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,029,025 B2 - Document ID: US11029025B2 - Status: Granted - Kind: B2 - Application number: 16/976,724 - Filed: 2019-08-14 - Published: 2021-02-25 - Granted: 2021-06-08 - Earliest claimed: 2019-08-14 - Assignees: Taiheiyo Cement Corporation - Applicants: Taiheiyo Cement Corporation - Inventors: Yuya Sano; Kouichi Naitou; Hidenori Tsukidate; Hideyuki Sugaya - Web page: https://patentgrep.com/patent/US11029025B2 ## CPC - F23G 5/20: having rotating or oscillating drums - F23D 1/00: Burners for combustion of pulverulent fuel - F23G 5/444: {for solid waste (F23G5/448 takes precedence)} - F27B 7/34: Arrangements of heating devices - F23G 2205/20: using airblast or pneumatic feeding - F23G 2900/54402: Injecting fluid waste into incinerator - F23G: CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION - F23D: BURNERS - F27B: FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS ## Abstract There is provided a combustible waste injection device and a method for operating the same which can suppress a landing combustion of a combustible waste and suppress excessive change of a flame state from a cement kiln burner even if a rate of using the combustible waste fluctuates. A combustible waste injection device according to the present invention has a combustible waste flow channel which is arranged in an inner side of the air flow channel in an innermost shell, is installed in parallel to an axial direction of the cement kiln burner device and is provided for flow feeding a combustible waste flow, and the combustible waste flow channel has an inclined surface having a rising slope toward the injection port near the injection port in such a manner that a flow channel width in a vertical direction is narrowed toward the injection port. ## Claims ### Claim 1 A combustible waste injection device which can be attached to a cement kiln burner device having at least one air flow channel in an inner side of a powdered-solid-fuel flow channel, the combustible waste injection device comprising: a combustible waste flow channel which is arranged in an inner side of the air flow channel in an innermost shell, is installed in parallel to an axial direction of the cement kiln burner device and is provided for feeding a combustible waste flow, wherein the combustible waste flow channel has an inclined surface formed near the injection port, the inclined surface having a rising slope toward the injection port in such a manner that a combustible waste flow channel width in a vertical direction is narrowed toward the injection port with a combustible waste flow channel width in a horizontal direction being maintained. ### Claim 2 (depends on 1) The combustible waste injection device according to claim 1, wherein the inclined surface is positioned at a position where an opposite end portion to the injection port of the combustible waste flow channel in the axial direction is between 150 mm and 2000 mm away from the injection port, and an elevation angle thereof is between 1 degree and 4 degrees. ### Claim 3 (depends on 1) The combustible waste injection device according to claim 1, further comprising an assist air inflow port which can flow an assist air flow into the combustible waste flow channel toward the axis center of the combustible waste flow channel at a position where the inclined surface is formed in the combustible waste flow channel, wherein the assist air inflow port is arranged at a plurality of positions in a circumferential direction. ### Claim 4 (depends on 3) The combustible waste injection device according to claim 3, wherein the assist air inflow port is arranged at a plurality of positions sandwiching in a vertical direction a horizontal plane including the axis center of the combustible waste flow channel when cutting with a plane orthogonal to the axis center of the combustible waste flow channel. ### Claim 5 (depends on 4) The combustible waste injection device according to claim 4, wherein the combustible waste flow channel is adapted to be capable of ejecting the combustible waste flow upward in the vertical direction after a width of the combustible waste flow is reduced in the direction toward the axis center by the assist air flow flowing into the combustible waste flow channel from the assist air inflow port. ### Claim 6 (depends on 3) The combustible waste injection device according to claim 3, wherein the assist air inflow port is installed in a range between 10 mm and 600 mm from the injection port of the combustible waste flow channel. ### Claim 7 (depends on 1) A method for operating the combustible waste injection device according to claim 1, wherein the method comprises ejecting the combustible waste flow from the combustible waste flow channel vertically upward from the horizontal plane. ### Claim 8 (depends on 7) The method for operating the combustible waste injection device according to claim 7, further comprising an assist air inflow port which can flow an assist air flow into the combustible waste flow channel toward the axis center of the combustible waste flow channel at a position where the inclined surface is formed in the combustible waste flow channel, wherein the assist air inflow port is arranged at a plurality of positions in a circumferential direction, and wherein an upward assist air flow rate flowed into the combustible waste flow channel from the vertically lower side of the horizontal plane is equal to or more than a downward assist air flow rate flowed into the combustible waste flow channel from the vertically upper side of the horizontal plane. ### Claim 9 (depends on 8) The method for operating the combustible waste injection device according to claim 8, wherein a total amount of the air flow rates flowed into the combustible waste flow channel from the assist air inflow port is between 5 volume % to 65 volume % of a primary air flow rate flowing in the combustible waste flow channel. ### Claim 10 (depends on 8) The method for operating the combustible waste injection device according to claim 8, wherein a rate of the downward assist air flow rate with respect to the upward assist air flow rate is between 0.5 and 1.0. ### Claim 11 (depends on 8) The method for operating the combustible waste injection device according to claim 8, wherein an inflow angle of the assist air flow flowed into the combustible waste flow channel is greater than 0 degrees and equal to or less than 90 degrees with respect to the flow feeding direction of the combustible waste flow which flow feeds within the combustible waste flow channel.