# US 10,502,417 B2 · Exhaust gas treatment method and exhaust gas treatment device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,417 B2 - Document ID: US10502417B2 - Status: Granted - Kind: B2 - Application number: 15/541,757 - Filed: 2015-09-10 - Published: 2017-12-28 - Granted: 2019-12-10 - Earliest claimed: 2015-01-21 - Assignees: Taiyo Nippon Sanso Corporation - Applicants: Taiyo Nippon Sanso Corporation - Inventors: Yasuyuki Yamamoto; Kimio Iino; Yoshiyuki Hagihara - Web page: https://patentgrep.com/patent/US10502417B2 ## CPC - F23G 7/06: of waste gases or noxious gases, e.g. exhaust gases (exhaust apparatus for engines with means for rendering the exhaust innocuous, e.g. by thermal or catalytic conversion, F01N3/08; combustion of uncombusted material from primary combustion within apparatus for combustion of solid or fluent fuel F23B {, of non combusted material from primary combustion of solid fuels; of gases produced by primary combustion of solid fuels F23B90/04}, F23C) - D01F 9/32: Apparatus therefor - F23G 5/16: in a separate combustion chamber - F23G 5/46: Recuperation of heat - F23G 7/065: {using gaseous or liquid fuel} - F23L 7/007: {Supplying oxygen or oxygen-enriched air} - D01F 9/328: {for manufacturing filaments from polyaddition, polycondensation, or polymerisation products} - F23G 2202/101: with controlled oxidant supply - F23G 2202/102: with supplementary heating - F23G 2202/103: in separate chambers - F23G 2209/14: Gaseous waste or fumes - Y02E 20/34: Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery - F23G: CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION - D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS - F23L: SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ({air-supply arrangements for fluent fuels F23C;} firebridges with means for feeding air or steam F23M3/04; baffles or shields with air supply passages F23M9/04); VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS {(dampers and throat restrictors for open fire-places F24; air inlet valves for open fire fronts F24)}; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract The present invention provides an exhaust gas treatment method and an exhaust gas treatment device which prevent the generation of NOX, and treat a first exhaust gas and a second exhaust gas with a small amount of fuel, and the exhaust gas treatment method comprises a first combustion step which treats a first exhaust gas discharged from a carbonization furnace for carbonizing a fibrous substance in an inert atmosphere and a graphitization furnace for graphitizing a fibrous substance in an inert atmosphere and a second combustion step of treating a second exhaust gas discharged from a flameproofing furnace for flameproofing a fibrous substance in air atmosphere, wherein the first exhaust gas is combusted at an oxygen ratio of 0.8 or less in the first combustion step, and the second exhaust gas is combusted in the second combustion step using sensible heat and latent heat of a third exhaust gas discharged in the first combustion step. ## Claims ### Claim 1 An exhaust gas treatment device comprising: a first combustion furnace which treats a first exhaust gas; a second combustion furnace which treats a second exhaust gas; a first exhaust gas supplying device which supplies the first exhaust gas into the first combustion furnace; a second exhaust gas supplying device which supplies the second exhaust gas into the second combustion furnace; and a first burner which is provided in the first combustion furnace, wherein the second combustion furnace is provided on the secondary side of the first combustion furnace, and an internal space of the first combustion furnace and an internal space of the second combustion furnace communicate with each other, wherein the exhaust gas treatment device further comprises a first thermometer which measures a temperature in the first combustion furnace, a second thermometer which measures a temperature in the second combustion furnace, and a control unit which controls an amount of combustion of the first burner, and the amount of combustion of the first burner is controlled based on the temperatures obtained from the first thermometer and the second thermometer. ### Claim 2 (depends on 1) The exhaust gas treatment device according to claim 1, wherein oxygen-enriched air having an oxygen concentration of 25 to 100% by volume is used as a combustion-supporting gas of the first burner provided in the first combustion furnace. ### Claim 3 (depends on 1) The exhaust gas treatment device according to claim 1, wherein the first exhaust gas supplying device is the first burner and the first exhaust gas is supplied from the first burner. ### Claim 4 (depends on 1) The exhaust gas treatment device according to claim 1, wherein the first exhaust gas supplying device is a first blowing port provided in a wall of the first combustion furnace, and the first exhaust gas is supplied from the first blowing port. ### Claim 5 (depends on 1) The exhaust gas treatment device according to claim 1, wherein the second exhaust gas supplying device is a second blowing port provided in a wall of the second combustion furnace, and the second blowing port is configured so as to blow the second exhaust gas in a tangential direction of the wall of the second combustion furnace. ### Claim 6 (depends on 1) The exhaust gas treatment device according to claim 1, wherein the exhaust gas treatment device further comprises a heat exchanger at a stage subsequent to the exhaust gas treatment device, and the second exhaust gas is preheated using sensible heat of an exhaust gas discharged from the second combustion furnace. ### Claim 7 (depends on 1) The exhaust gas treatment device according to claim 1, wherein the first combustion furnace and the second combustion furnace each have an aperture, and the apertures are joined while being opposed to each other. ### Claim 8 The exhaust gas treatment device according to 7, wherein at least one of the first combustion furnace and the second combustion furnace has a throttle portion which regulates an aperture area of the aperture. ### Claim 9 (depends on 1) The exhaust gas treatment device according to claim 1, wherein the exhaust gas treatment device further comprises a communication pipe which is provided between the first combustion furnace and the second combustion furnace and allows the internal space of the first combustion furnace and the internal space of the second combustion furnace to communicate with each other. ### Claim 10 (depends on 8) An exhaust gas treatment method using the exhaust gas treatment device according to claim 8 comprising: a first combustion step of treating a first exhaust gas discharged from a carbonization furnace for carbonizing a fibrous substance in an inert atmosphere and a graphitization furnace for graphitizing a fibrous substance in an inert atmosphere; and a second combustion step of treating a second exhaust gas discharged from a flameproofing furnace for flameproofing a fibrous substance in air atmosphere; wherein the first exhaust gas is combusted at an oxygen ratio of 0.8 or less in the first combustion step, and the second exhaust gas is combusted in the second combustion step using sensible heat and latent heat of a third exhaust gas discharged in the first combustion step. ### Claim 11 (depends on 10) The exhaust gas treatment method according to claim 10, wherein the first exhaust gas is combusted at 1,000 to 1,600° C. in the first combustion step, and the second exhaust gas is combusted at 700 to 1,200° C. in the second combustion step. ### Claim 12 An exhaust gas treatment device comprising: a first combustion furnace which treats a first exhaust gas; a second combustion furnace which treats a second exhaust gas; a first exhaust gas supplying device which supplies the first exhaust gas into the first combustion furnace; a second exhaust gas supplying device which supplies the second exhaust gas into the second combustion furnace; and a first burner which is provided in the first combustion furnace, wherein the second combustion furnace is provided on the secondary side of the first combustion furnace, and an internal space of the first combustion furnace and an internal space of the second combustion furnace communicate with each other, wherein the exhaust gas treatment device further comprises a second burner which is provided in the second combustion furnace, and wherein the exhaust gas treatment device further comprises a first thermometer which measures a temperature in the first combustion furnace, a second thermometer which measures a temperature in the second combustion furnace, and a control unit which controls an amount of combustion of the first burner and the second burner, and the amount of combustion of the first burner and the second burner is controlled based on the temperatures obtained from the first thermometer and the second thermometer. ### Claim 13 (depends on 12) The exhaust gas treatment device according to claim 12, wherein oxygen-enriched air having an oxygen concentration of 25 to 100% by volume is used as a combustion-supporting gas of the first burner provided in the first combustion furnace. ### Claim 14 (depends on 12) The exhaust gas treatment device according to claim 12, wherein the first exhaust gas supplying device is the first burner and the first exhaust gas is supplied from the first burner. ### Claim 15 (depends on 12) The exhaust gas treatment device according to claim 12, wherein the first exhaust gas supplying device is a first blowing port provided in a wall of the first combustion furnace, and the first exhaust gas is supplied from the first blowing port. ### Claim 16 (depends on 12) The exhaust gas treatment device according to claim 12, wherein the second exhaust gas supplying device is a second blowing port provided in a wall of the second combustion furnace, and the second blowing port is configured so as to blow the second exhaust gas in a tangential direction of the wall of the second combustion furnace. ### Claim 17 (depends on 12) The exhaust gas treatment device according to claim 12, wherein the exhaust gas treatment device further comprises a heat exchanger at a stage subsequent to the exhaust gas treatment device, and the second exhaust gas is preheated using sensible heat of an exhaust gas discharged from the second combustion furnace. ### Claim 18 (depends on 12) The exhaust gas treatment device according to claim 12, wherein the first combustion furnace and the second combustion furnace each have an aperture, and the apertures are joined while being opposed to each other. ### Claim 19 (depends on 18) The exhaust gas treatment device according to claim 18, wherein at least one of the first combustion furnace and the second combustion furnace has a throttle portion which regulates an aperture area of the aperture. ### Claim 20 (depends on 12) The exhaust gas treatment device according to claim 12, wherein the exhaust gas treatment device further comprises a communication pipe which is provided between the first combustion furnace and the second combustion furnace and allows the internal space of the first combustion furnace and the internal space of the second combustion furnace to communicate with each other. ### Claim 21 (depends on 12) An exhaust gas treatment method using the exhaust gas treatment device according to claim 12 comprising: a first combustion step of treating a first exhaust gas discharged from a carbonization furnace for carbonizing a fibrous substance in an inert atmosphere and a graphitization furnace for graphitizing a fibrous substance in an inert atmosphere; and a second combustion step of treating a second exhaust gas discharged from a flameproofing furnace for flameproofing a fibrous substance in air atmosphere; wherein the first exhaust gas is combusted at an oxygen ratio of 0.8 or less in the first combustion step, and the second exhaust gas is combusted in the second combustion step using sensible heat and latent heat of a third exhaust gas discharged in the first combustion step. ### Claim 22 (depends on 21) The exhaust gas treatment method according to claim 21, wherein the first exhaust gas is combusted at 1,000 to 1,600° C. in the first combustion step, and the second exhaust gas is combusted at 700 to 1,200° C. in the second combustion step.