# US 10,119,700 B2 · Arrangement and method in soda recovery boiler > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,119,700 B2 - Document ID: US10119700B2 - Status: Granted - Kind: B2 - Application number: 14/870,628 - Filed: 2015-09-30 - Published: 2016-04-07 - Granted: 2018-11-06 - Earliest claimed: 2014-10-03 - Assignees: Valmet Technologies Oy - Applicants: Valmet Technologies Oy - Inventors: Jussi Nyman; Kari Haaga; Taisto Rajala - Web page: https://patentgrep.com/patent/US10119700B2 ## CPC - F22B 1/1892: {Systems therefor not provided for in F22B1/1807 - F22B1/1861} - D21C 11/12: Combustion of pulp liquors - F22B: METHODS OF STEAM GENERATION; STEAM BOILERS - D21C: PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR ## Abstract An arrangement and a method in a soda recovery boiler. The soda recovery boiler comprises a second pass which is provided with at least one superheater and a second pass ash hopper, a front and/or rear wall of the ash hopper being connected to steam circulation of the soda recovery boiler. ## Claims ### Claim 1 A soda recovery boiler comprising: a second pass, the second pass being provided with at least one superheater; a second pass ash hopper, at least one of a front or a rear wall of the ash hopper being connected to steam circulation of the soda recovery boiler; and a drum connected to at least one of the front or the rear wall of the ash hopper and configured for feeding steam for the steam circulation of the soda recovery boiler. ### Claim 2 (depends on 1) The soda recovery boiler as claimed in claim 1, wherein the drum is directly connected to at least one of the front or the rear wall. ### Claim 3 (depends on 1) The soda recovery boiler as claimed in claim 1, wherein the drum is indirectly connected to at least one of the front or the rear wall. ### Claim 4 (depends on 3) The soda recovery boiler as claimed in claim 3, wherein: the soda recovery boiler further comprises a furnace before the superheaters; and the furnace is provided with a steam screen pipe system connected to at least one of the front or the rear wall of the ash hopper, the steam screen pipe system being configured for feeding steam. ### Claim 5 (depends on 3) The soda recovery boiler as claimed in claim 3, wherein: the soda recovery boiler further comprises a furnace before the superheaters; and the furnace comprises a furnace roof superheater connected to at least one of the front or the rear wall of the ash hopper, the furnace roof superheater being configured for feeding steam. ### Claim 6 (depends on 3) The soda recovery boiler as claimed in claim 3, wherein the second pass ash hopper comprises an ash hopper roof superheater connected to at least one of the front or the rear wall of the ash hopper, the ash hopper roof superheater being configured for feeding steam. ### Claim 7 (depends on 1) The soda recovery boiler as claimed in claim 1, wherein the front and rear walls of the ash hopper are connected to the steam circulation in series so that steam is fed from the front wall of the ash hopper to the rear wall thereof. ### Claim 8 (depends on 1) The soda recovery boiler as claimed in claim 1, wherein the front and rear walls of the ash hopper are connected to the steam circulation in series so that steam is fed from the rear wall of the ash hopper to the front wall thereof. ### Claim 9 (depends on 1) The soda recovery boiler as claimed in claim 1, wherein the front and rear walls of the ash hopper are connected to the steam circulation in parallel so that only some of the steam to be conveyed to the front and rear walls is fed to each of them. ### Claim 10 (depends on 1) The soda recovery boiler as claimed in claim 1, wherein the front wall of the ash hopper is connected to the steam circulation and the rear wall is water-cooled. ### Claim 11 (depends on 10) The soda recovery boiler as claimed in claim 10, wherein the rear wall of the ash hopper is integrated into a front wall of the boiler bank, which is connected to water circulation. ### Claim 12 (depends on 11) The soda recovery boiler as claimed in claim 11, wherein steam is arranged to be fed from the second pass side wall to a hanging superheater arranged inside the second pass. ### Claim 13 (depends on 1) The soda recovery boiler as claimed in claim 1, wherein steam is arranged to be fed from at least one of the front or the rear wall of the ash hopper to a second pass side wall. ### Claim 14 A method in a soda recovery boiler, the method comprising the steps of: providing a soda recovery boiler comprising: a second pass; at least one superheater positioned in the second pass; a second pass ash hopper having a front and a rear wall; and a drum connected to at least one of the front or the rear wall of the ash hopper and configured for feeding steam; and cooling the second pass by conveying steam, via the drum, to at least one of the front or the rear wall of the second pass ash hopper. ### Claim 15 (depends on 14) A method as claimed in claim 14, wherein: the drum is directly connected to at least one of the front or the rear wall; and the step of conveying steam occurs from the drum directly to at least one of the front or the rear wall of the ash hopper. ### Claim 16 (depends on 14) A method as claimed in claim 14, wherein: the drum is indirectly connected to at least one of the front or the rear wall; and the step of conveying steam occurs from the drum, indirectly and via a temperature surface, to at least one of the front or the rear wall of the second pass ash hopper. ### Claim 17 (depends on 14) A method as claimed in claim 14, wherein the method further comprises the step of feeding the steam from at least one of the front or the rear wall of the ash hopper directly to the drum. ### Claim 18 (depends on 14) A method as claimed in claim 14, further comprising the step of feeding the steam from at least one of the front or the rear wall of the ash hopper to a temperature surface of the soda recovery boiler. ### Claim 19 A soda recovery boiler comprising: a second pass, the second pass being provided with at least one superheater; a second pass ash hopper, at least a front wall of the ash hopper being connected to steam circulation of the soda recovery boiler; and a drum connected to at least the front wall of the ash hopper and configured for feeding steam for the steam circulation of the soda recovery boiler.