公开(公告)号：US11746470B2

公开(公告)日：2023-09-05

申请号：US17015635

申请日：2020-09-09

申请人： Valmet Automation Oy

发明人： Jarmo Mansikkasalo ,  Jukka Koskinen

IPC分类号： D21C11/12 ,  F23G7/04 ,  F22B1/20 ,  F23G5/50 ,  F22B35/00

CPC分类号： D21C11/12 ,  F23G7/04 ,  F22B1/20 ,  F22B35/00 ,  F23G5/50 ,  F23G2207/101 ,  F23G2209/101

摘要： A method for controlling carryover in a chemical recovery boiler. The method comprises feeding black or brown liquor to a furnace of the chemical recovery boiler through an injection gun to burn the black or brown liquor. The chemical recovery boiler comprises a bullnose, which narrows the furnace, and a first superheater, of which at least a part is arranged at a higher vertical level than the bullnose. The method comprises measuring information indicative of a spatial temperature distribution on a cross section of the furnace, wherein the cross section is above the injection gun and below the first superheater; determining primary information indicative of carryover using the information indicative of the spatial temperature distribution on the cross section of the furnace; and controlling a temperature of the black or brown liquor that is fed to the furnace using the primary information. In addition, a system for performing the method.

公开(公告)号：US20230175689A1

公开(公告)日：2023-06-08

申请号：US17597284

申请日：2021-03-04

申请人： Sullivan, Higgins, and Brion Power Plant Engineering, LLC

发明人： Eugene Sullivan ,  Daniel R Higgins

IPC分类号： F23G5/00 ,  D21C11/12 ,  F23G7/04 ,  F23G5/50 ,  D21C11/10

CPC分类号： F23G5/006 ,  D21C11/122 ,  F23G7/04 ,  F23G5/50 ,  D21C11/10

摘要： A chemical recovery boilers is described in which the primary air system is reconfigured to provide aggressive charbed control and improved combustion in the lower furnace. The fewest number of primary air ports are used on two opposing walls to generate powerful air jets that penetrate across the boiler providing physical and thermal stability to the charbed while increasing the heat release and combustion stability in the lower furnace, increasing reduction efficiency, and lowering carryover and emissions. Various embodiments are described including operating strategies and multi-level black liquor injection.

公开(公告)号：US20220186927A1

公开(公告)日：2022-06-16

申请号：US17438078

申请日：2020-03-11

申请人： VALMET AB

发明人： Erik WALLIN

IPC分类号： F23G7/10 ,  D21C11/12 ,  F22B35/00

摘要： The present invention relates to a heat recovery system 10, 11, 12 for recovering heat from flue gas generated by combustion at a biomass plant installation. The heat recovery system 10, 11, 12 comprises a flue gas cooler 200 configured to receive flue gas 201 from a combustion and transfer heat from the flue gas 201 to feed water in a heat recovery fluid circuit101. The feed water in the heat recovery fluid circuit101 is taken from and returned to a feed water main system. The feed water main system could be provided with a feed water tank 100to which a heat recovery circuit inlet 112 and a heat recovery circuit outlet are connected. Further, the heat recovery system comprises a waste heat accumulator 300 configured to receive feed water, heated by flue gas 201 in a flue gas cooler 200, and cool by flashing the received feed water in order to generate flash steam, and the heat recovery system 10, 11, 12 comprises a control arrangement 533. Further, the present invention also relates to a method performed by the control arrangement for use in recovering heat from flue gas generated by combustion at a bio plant installation.

公开(公告)号：US20220162101A1

公开(公告)日：2022-05-26

申请号：US17304790

申请日：2021-06-25

申请人： Abdolreza Assadi ,  Ronald Scott Sleight

发明人： Abdolreza Assadi ,  Ronald Scott Sleight

IPC分类号： C02F3/28 ,  B09B3/00 ,  C02F9/00 ,  D21C11/12 ,  D21B1/02 ,  C02F1/68 ,  C02F3/34 ,  C12P5/02 ,  D21C5/02

摘要： An anaerobic digestion system may include a material grinding/pulping portion, a hydrolysis portion arranged downstream of the grinding portion, a multiple chamber anaerobic reactor arranged downstream from the hydrolysis portion and including a gas collection and reintroduction system, a collection system for collecting digestate and gas from the anaerobic reactor.

公开(公告)号：US20210071361A1

公开(公告)日：2021-03-11

申请号：US17015635

申请日：2020-09-09

申请人： Valmet Automation Oy

发明人： Jarmo MANSIKKASALO ,  Jukka KOSKINEN

IPC分类号： D21C11/12 ,  F23G7/04

摘要： A method for controlling carryover in a chemical recovery boiler. The method comprises feeding black or brown liquor to a furnace of the chemical recovery boiler through an injection gun to burn the black or brown liquor. The chemical recovery boiler comprises a bullnose, which narrows the furnace, and a first superheater, of which at least a part is arranged at a higher vertical level than the bullnose. The method comprises measuring information indicative of a spatial temperature distribution on a cross section of the furnace, wherein the cross section is above the injection gun and below the first superheater; determining primary information indicative of carryover using the information indicative of the spatial temperature distribution on the cross section of the furnace; and controlling a temperature of the black or brown liquor that is fed to the furnace using the primary information. In addition, a system for performing the method.

公开(公告)号：US10927498B2

公开(公告)日：2021-02-23

申请号：US15508963

申请日：2015-09-22

申请人： Huntsman International LLC

发明人： André Heeres ,  Niels Jan Schenk ,  Arend-Jan Zeeuw ,  Bart De Waele ,  Kornelis Jan Kamminga

IPC分类号： D21C11/12 ,  C10G3/00 ,  C10G1/00 ,  B01J29/40 ,  B01J29/89 ,  B01J35/10 ,  B01J37/00 ,  C07C4/16 ,  C07C4/18 ,  D21C11/00 ,  D21C11/06

摘要： A process for the preparation of small aromatic compounds from black liquor comprising: providing black liquor that derives from alkaline treatment of wood chips; subjecting the black liquor to a pyrolysis treatment to yield a pyrolysed black liquor gas and a solid mass comprising char and salts in a first reactor, wherein the salts substantially derive from the treatment of black liquor; contacting at least part of the pyrolysed black liquor gas with a catalyst in a second reactor, which is different from the first reactor to provide a conversion treatment to yield a conversion product; and recovering small aromatic compounds from the conversion product.

公开(公告)号：US20190309474A1

公开(公告)日：2019-10-10

申请号：US16374463

申请日：2019-04-03

申请人： CASCADES CANADA ULC

发明人： Jonathan LALONDE ,  Pierre HUDON ,  Claude AUDET ,  Pierre BOULAY ,  Smail KALLA ,  Gérard GOSSELIN ,  Robert MARTINEAU

IPC分类号： D21C11/12 ,  B01D37/00 ,  B01D1/00 ,  D21C1/02 ,  D21C11/10 ,  D21C11/00 ,  D21J1/00 ,  F23G7/04

摘要： Various techniques are described for enhanced combustion of hot water extraction (HWE) derived liquor. For example, the HWE derived liquor can be pre-treated prior to introduction into a combustion chamber. The pre-treatment can include subjecting HWE derived liquor to filtration to remove suspended solids, evaporation to produce a first stage concentrated HWE liquor; additional concentration to produce a second stage concentrated HWE liquor; additional filtration to remove additional suspended solids; and pre-heating to produce a preheated HWE liquor. The preheated HWE liquor can be atomized and combined with pre-heated combustion air supplied into a combustion chamber to effect combustion of the HWE derived liquor.

公开(公告)号：US20190249364A1

公开(公告)日：2019-08-15

申请号：US16330094

申请日：2017-09-05

申请人： SunCarbon AB

发明人： Anders ARKELL

IPC分类号： D21C11/12 ,  D21C11/10

CPC分类号： D21C11/122 ,  D21C11/00 ,  D21C11/10 ,  D21C11/12 ,  Y02P40/44

摘要： A system (10) for treating spent pulping liquor (14) comprising lignin to provide green liquor (47) is disclosed. The system (10) comprises an evaporator (22), a recovery boiler (34), at least one filter (58, 74), and a green liquor plant (46). The evaporator (22) concentrates a first stream (18) of the spent pulping liquor (14) to provide a concentrated pulping liquor (30). The recovery boiler (34) incinerates the concentrated pulping liquor (30) to provide a smelt (42). The at least one filter (58, 74) filters a second stream (54) of the spent pulping liquor (14) to remove lignin therefrom to provide a permeate (66, 82). The green liquor plant (46) is for dissolving the smelt (42) from the recovery boiler (34) in the permeate (66, 82) from the at least one filter (58, 74) to provide green liquor (47). Also disclosed is a method for treating spent pulping liquor (14) to provide green liquor (47).

公开(公告)号：US20190119852A1

公开(公告)日：2019-04-25

申请号：US16170014

申请日：2018-10-24

申请人： Sherif Farag

发明人： Sherif Farag ,  Jamal Chaouki

IPC分类号： D21C11/12 ,  D21C11/00 ,  C10B53/02

摘要： There is described a process for the recovering of inorganic chemicals of pulp and paper making processes (IC) and the production of biochemicals from black liquor (BL) using microwaves (MW) comprising: (a) filtration of BL to produce filtered BL, in a media, (b) drying of said filtered BL with MW in said media to produce dried BL, (c) pyrolysis of said dried BL with MW in said media to produce bio-oil, biogas, and solid residue, (d) recovering of said bio-oil, and (e) recovering of IC and biocarbon from said solid residue. The disclosed process does not require chemical additives compared to processes rely on precipitation of lignin to recover said IC. The disclosed process supports efficient, direct, and long-lasting reductions in greenhouse gas emissions and local air pollutants resulting from the current processes rely on burning BL in recovery boilers to recover said IC.

公开(公告)号：US10260744B2

公开(公告)日：2019-04-16

申请号：US15832400

申请日：2017-12-05

申请人： Valmet Technologies Oy

发明人： Jussi Nyman ,  Taisto Rajala ,  Ari Saarela

IPC分类号： F23J15/00 ,  D21C11/12 ,  F22B21/40 ,  F22B31/04 ,  F22G3/00 ,  F22G7/14

摘要： A chemical recovery boiler (100), including a furnace (1), comprising a front wall (2), a back wall (3), and the back wall (3) comprising a nose arch (4). The boiler further comprises at least one superheater (5) arranged in upper part of the furnace (1), and a screen pipe system (6), comprising an obliquely arranged screen pipe section (7) positioned before/under the at least one superheater (5) in the furnace (1). The obliquely arranged screen pipe section (7) comprises screen pipes (8) ascending (i) either from the front wall (2) to the back wall (3), and arranged to turn back in a turn (13) from the back wall (3) and extend obliquely upwards from the back wall (3), or (ii) from the back wall (3) to the front wall (2), and arranged to turn back in a turn (13) from the front wall (2) and extend obliquely upwards from the front wall (2). The screen pipe system (6) further comprises a vertically arranged screen pipe section (9) extending from the obliquely arranged screen pipe section (7). The screen pipes (8) of the vertically arranged screen pipe section (9) are arranged to extend parallel with the at least one superheater (5) in upper part of the furnace (1).