[go: up one dir, main page]

WO2000029666A1 - Procede et appareil d'injection de sulfate de soude dans une chaudiere de recuperation - Google Patents

Procede et appareil d'injection de sulfate de soude dans une chaudiere de recuperation Download PDF

Info

Publication number
WO2000029666A1
WO2000029666A1 PCT/US1999/027028 US9927028W WO0029666A1 WO 2000029666 A1 WO2000029666 A1 WO 2000029666A1 US 9927028 W US9927028 W US 9927028W WO 0029666 A1 WO0029666 A1 WO 0029666A1
Authority
WO
WIPO (PCT)
Prior art keywords
salt
cake
recovery boiler
injecting
particles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1999/027028
Other languages
English (en)
Other versions
WO2000029666A8 (fr
Inventor
Eugene Sullivan
Daniel R. Higgins
Robert B. Hill
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ANTHONY-ROSS Co
Original Assignee
ANTHONY-ROSS Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ANTHONY-ROSS Co filed Critical ANTHONY-ROSS Co
Publication of WO2000029666A1 publication Critical patent/WO2000029666A1/fr
Publication of WO2000029666A8 publication Critical patent/WO2000029666A8/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J7/00—Arrangement of devices for supplying chemicals to fire
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0085—Introduction of auxiliary substances into the regenerating system in order to improve the performance of certain steps of the latter, the presence of these substances being confined to the regeneration cycle
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/06—Treatment of pulp gases; Recovery of the heat content of the gases; Treatment of gases arising from various sources in pulp and paper mills; Regeneration of gaseous SO2, e.g. arising from liquors containing sulfur compounds
    • D21C11/063—Treatment of gas streams comprising solid matter, e.g. the ashes resulting from the combustion of black liquor
    • D21C11/066—Separation of solid compounds from these gases; further treatment of recovered products
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/12—Combustion of pulp liquors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/006—Layout of treatment plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
    • F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
    • F23J3/023—Cleaning furnace tubes; Cleaning flues or chimneys cleaning the fireside of watertubes in boilers

Definitions

  • the present invention relates to an apparatus and method for reducing the rate of accumulation and force of adhesion of particulates and condensates on chemical recovery boiler surfaces and keeping them in suspension in flue gasses by injecting salt-cake particles into the flue gas stream of a chemical recovery boiler.
  • Pulp for papermaking is commonly manufactured according to the Kraft or sulfate process wherein wood chips are treated with a cooking liquor including sodium sulfide (Na 2 S) and sodium hydroxide (NaOH) . The wood chips and liquor are cooked in a digester under predetermined heat and temperature conditions. At a subsequent point in the process, a "black liquor", comprising spent chemicals and organic material is separated from the pulp, and is treated in a chemical recovery boiler for reclaiming the cooking chemicals. Without this reclamation and reuse of the cooking chemicals, the cost of the kraft papermaking process would be prohibitive.
  • This "black liquor” is the fuel for the recovery boiler. It has a high inorganic content, rich in sodium salts and carbonates.
  • the “black liquor” is sprayed into the firebox of the recovery boiler wherein its organic material burns at a high temperature, and the inorganic chemicals, are deposited on the floor of the firebox in the molten mass known as a smelt bed.
  • a fume of metallic salts is liberated into the flue gas stream and rises in the chemical recovery boiler with the flue gases generated from the burning organic material.
  • This fouling drastically affects the efficiency of the recovery boiler as the buildup decreases the heat transfer rates of the boiler, restricts flue gas passages, and affects operation of some boiler heat transfer surfaces, thereby forcing the recovery boiler to be shut down for cleaning, to remove the built up deposits.
  • the amount of time and the efficiency lost to cleaning the boiler surfaces is related to the rate of accumulation and force of adhesion the inorganic salts and organic materials have onto the boiler surfaces.
  • the effectiveness of the sootblowers is decreased, the sootblower duty cycle is increased, more steam is used for cleaning, and the run time between shut downs is decreased when the adhesion of the deposits is greater. It is known in the industry to inject magnesium oxide (MgO) into recovery boilers to react with the flue gas stream.
  • MgO magnesium oxide
  • the MgO acts to raise the melting temperature of the fume particles, thereby causing them to condense while in suspension. This causes the fume to not adhere as strongly to the boiler surfaces, but is costly, as the MgO is not a part of the recovery boiler' s normal chemical process and must constantly be added, and introduces a chemical into the boiler that is not normally employed as a part of the kraft pulping process .
  • salt-cake particles taken out of the salt-cake recovery stream are diverted via an extractor to a conveyance means which transports the salt-cake to an injection site located at a higher elevation with respect to the char bed, wherein the salt-cake particles are propelled into the flue gas stream to "seed" the rising fume and particulates.
  • the injected salt-cake gives the rising fume a surface to condense on. Similarly, it also gives the rising particulates a surface on which to agglomerate.
  • the apparatus has an extraction means which removes salt-cake from a salt-cake recovery stream and transports the salt-cake to a conveyance means.
  • the recyclable, reusable chemicals are known as salt-cake ash.
  • This salt-cake results from the material broken loose by the sootblowers and from the fume particulates that are collected and typically include: sodium sulfate Na 2 S0 4 , sodium carbonate Na 2 C0 3 , sodium chloride NaCl, sodium sulfide Na 2 S, potassium sulfate K 2 S0 4 , potassium carbonate K 2 C0 3 , potassium chloride KC1, and potassium sulfide K 2 S.
  • the extraction means has a sifting mechanism that can separate salt-cake particles by size or weight, thereby transporting to the conveyance means, substantially uniform salt-cake particles. This size or weight selection can be important to the method used for transporting the salt-cake particles to the injection sites.
  • the extraction means may incorporate a pelletizing means which will form the recovered salt-cake into substantially uniform salt-cake pellets. Incorporation of both the sifter and the pelletizer is also possible.
  • the extraction means may obtain its salt-cake from various points of the recovery boiler's salt-cake recovery stream such as: the electrostatic precipitator; the generating bank ash hopper; the economizer ash hopper, or inside the recovery boiler. In some cases, it may be desired to crush the obtained salt-cake and/or to dry it prior to use.
  • the extraction means may also obtain the salt-cake from a source external to the boiler.
  • the conveyance means receives the salt-cake from the extraction means and transports the salt-cake to the injection sites, depositing the salt-cake into an injection hopper.
  • the conveyance means can move the salt-cake in various ways. In the preferred embodiment, this would be accomplished pneumatically, although it may also be accomplished through such mechanical methods as screw drives, conveyors, etc. If the salt-cake is moved pneumatically, the properties, the size, moisture content and weight of the salt-cake particles can be crucial to effective transport.
  • the injection site may receive the salt-cake particles directly from the conveyance means, but in the preferred embodiment, the injection sites receive a substantially constant feed of salt-cake from the injection hopper. Upon receiving salt-cake particles, the injection sites direct the particles through an opening in the boiler, and into the flue stream of the boiler.
  • the salt-cake particles may be divided into several streams and propelled into the flue gas stream from multiple and various locations.
  • the salt-cake particles are injected into the flue stream through spray nozzles that would be located in the upper one third of the boiler, however injection may also occur at the central one third, lower one third, or char bed level of the chemical recovery boiler.
  • the opening in the boiler through which the salt-cake particles would be propelled may be specifically dedicated to salt-cake injection, or may be an existing opening into the boiler such as: an inspection port; a liquor gun opening; a personnel access door; a maintenance beam opening; or a sootblower opening.
  • the salt-cake "seeding" may also be accomplished by salt-cake injection into the combustion air system, which feeds into the flue gas stream.
  • the injected salt-cake particles Once the injected salt-cake particles enter into the rising flue gas stream, some of the rising fume will condense on the injected salt-cake. In a similar fashion, some of the rising particulate will aggregate on the injected salt-cake.
  • the resulting "seeded" flue gas forms larger particles and adheres to boiler heat transfer surfaces with less force than that of "unseeded” flue gases.
  • the injected salt-cake is electrostatically charged before injection into the boiler, to enhance attraction to the suspended particles or discourage attraction to the boiler heat transfer surfaces.
  • a further object of the present invention is to provide a method and apparatus to improve the retention of particulates or fume in suspension within a recovery boiler, to reduce the rate at which the fume or particulates attach to the boiler, thereby reducing the fouling rate.
  • FIG. 1 is a schematic representation of the preferred embodiment of the chemical recovery boiler salt-cake injection apparatus
  • FIG. 2 is a diagrammatic representation of an alternative preferred embodiment of the chemical recovery boiler salt-cake injection apparatus, showing mechanical conveyance and injection;
  • FIG. 3 is a representation of the pneumatic conveyance.
  • the system according to a preferred embodiment of the present invention is used in a recovery boiler 10.
  • the recovery boiler includes a char bed 100 at the bottom thereof, and employs primary air ports 102 in the boiler walls near the char bed level.
  • the primary air ports serve to introduce combustion air into the boiler.
  • secondary ports 104 Located some distance above the level of the primary ports are secondary ports 104 and even higher up the boiler are tertiary ports 106, to provide secondary and tertiary air injection for improved boiler operation.
  • Most recovery boilers employ three levels of air ports. However, some recovery boilers have only two levels of air ports, while still others have four levels of air ports. In any event, somewhere above the secondary ports are liquor gun openings 108, which provide an injection point for the liquor guns to spray the black liquor into the boiler.
  • inspection ports 110 and maintenance beam openings 112 are provided for inspection purposes and to receive beams for use during maintenance procedures.
  • a personnel access door 114 may also be provided to allow access to the interior of the boiler.
  • superheater tubes 51 At the top portion of the boiler as illustrated are superheater tubes 51, a generating bank 116 and economizer 118. Below the generating bank and the economizer are generating bank ash hopper 18 and economizer ash hopper 22 respectively.
  • Plural sootblower openings 50 are distributed to receive the sootblowers for knocking built up material off the various heat transfer surfaces of the upper furnace. In operation, the black liquor is injected into the boiler via the liquor gun openings while combustion air is injected through the various air ports to maintain a combustion operation.
  • the flue gas stream 42 rises in the boiler, past the generating bank and economizer, passing eventually to an electrostatic precipitator 120, which has ash hoppers 20 therebelow.
  • salt-cake ash is knocked off the generating bank and economizer tubes by the sootblowers and is precipitated out by the electrostatic precipitator and will collect at the generating bank ash hoppers 18, economizer ash hoppers 22 and electrostatic precipitator ash hoppers 20. Also, some percentage of the salt-cake will naturally drop out of suspension into the hoppers. In accordance with the prior art, the material from these hoppers was ultimately returned to the process stream.
  • an extraction system 12 receives salt-cake particles 5 that are separated out at separator 19 from a point along a salt-cake recovery stream, to provide a stream 56 for use in accordance with the invention.
  • the salt- cake may suitably be obtained from the generating bank ash hoppers 18, economizer ash hoppers 22 or electrostatic precipitator ash hoppers 20.
  • the salt-cake 5 may also be received from a source 24 external from the boiler.
  • the extraction system 12 transports the salt-cake particles 5 to a conveyance system 23, suitably depositing the salt-cake 5 in a conveyance system hopper 26. Material not separated out is returned to the process at 13.
  • the extraction system 12 may include a sifter 14 or other such size selection device.
  • the sifter separates and allows only salt-cake particles 5 of a specific weight or size, to continue through the extraction system 12.
  • Non-conforming salt-cake particles are returned to the process stream as illustrated at 13.
  • the extraction system 12 may also contain a salt-cake pelletizer 16 which is a mechanism to pelletize the salt-cake into substantially uniform sizes, or a crusher to reduce the size of the salt-cake if the particle size is too large, or a combination of these sizing mechanisms.
  • These sizing mechanisms can be important features if the conveyance system 23 used is pneumatic or otherwise has size or weight limitations as to the transportable material.
  • sizing may also be important, to enhance the effectiveness of the charging. Also, for other purposes, the sizing might be adjusted. For example, if injecting the salt-cake directly on to the char bed, larger size salt-cake particles may be more desirable. Hence, pelletizing can be advantageous in such an application. Also, the transport properties within the boiler can make a certain size salt-cake particle more desirable. For example, to maintain suspension of the particles in the flue gas stream, a particular size particle may be desired.
  • the conveyance system 23 may convey material in both a lean phase such as a powder suspended in air, or in a dense phase that resembles a flowing liquid.
  • the conveyance system 23 comprises a storage hopper 26 a dispensing vessel 28, an agitator 25, and an air injector 27.
  • the conveyance storage hopper 26 feeds salt-cake 5 into the conveyance dispensing vessel 28 via an air lock, since vessel 28 is pressurized in the pneumatic conveyance embodiments.
  • the agitator 25 stirs up the salt-cake 5 to allow for uniform feed into the air injector 27.
  • the conveyance air injector 27 at timed intervals pneumatically transports the salt-cake 5 via piping system 30 to the injection point (or points) 38.
  • a mechanical screw type conveyance mechanism 29 comprised of a conveyance hopper 26, a screw drive motor 31 and a screw drive 33 (FIG. 2 ) may alternatively be employed in place of the pneumatic conveyance mechanism.
  • the operation of the pneumatic injector is halted, the pressure in the vessel 28 is bled-off, and the air lock is opened so that additional salt-cake from the hopper 26 may be introduced into vessel 28.
  • the air lock is then again sealed, and vessel 28 is repressurized, and operation of the pneumatic injector again starts. Since the injection of the salt-cake is not essential to the operation of the recovery boiler, the temporary halting of injecting enables a relatively inexpensive single air lock storage vessel and hopper to be employed.
  • a double air lock system can be employed, wherein injection continues, and an intermediate vessel is placed between hopper 26 and vessel 28, with air locks between both hopper 26 and the intermediate vessel and between the intermediate vessel and vessel 28.
  • the intermediate vessel is then alternately depressurized with the air lock to vessel 28 closed, and replenished with salt-cake from hopper 26.
  • the air lock between the hopper and the intermediate vessel is then closed, the intermediate vessel is repressurized, and the air lock between the intermediate vessel and vessel 28 is opened.
  • Vessel 28 is then resupplied with salt-cake from the intermediate vessel.
  • the conveyance system propels the salt-cake 5 out through a minimum of one spray injector 38 (FIG. 1), which feeds through an opening in the boiler.
  • the spray injector can be relatively simple, just an opening in the end of the pipe carrying the material, or can be designed to provide a desired injection pattern (e.g. a fan-shaped spray).
  • the injection point will be located in the top one-third vertical section of the recovery boiler.
  • the boiler openings can be in the middle one-third vertical section, the bottom one-third vertical section, or directly at the level of the char bed of the recovery boiler.
  • feedback or other systems can be employed to control the injection.
  • operator control can be provided so that a boiler operator can govern the injection amounts and timing.
  • feedback based on, for example, the operation of the sootblowers can also be used to govern the injection operations.
  • the salt-cake 5 may be injected into the recovery boiler at an existing opening.
  • openings would be an inspection ports 110, personnel access door 114, maintenance beam openings 112, a sootblower opening 50, liquor gun openings 108, or a combustion air port, whether primary air ports 102, secondary air ports 104 or tertiary air ports 106.
  • new openings can be provided in the boiler if no suitable existing opening is available.
  • the injection of the salt-cake into the combustion air stream of the boiler will in turn propel the salt-cake out into the flue gas stream.
  • the injection system may propel the salt-cake by a mechanical conveyer 33 (FIG. 2) .
  • the injection of the salt-cake directly into the flue gas stream 42 causes a "seeding" effect.
  • This "seeding" of salt-cake provides the rising fume a surface to condense on and also gives the rising particulate a surface to agglomerate on.
  • These two mechanisms create particles that are larger and less adhesive than the rising fume and particulate that does not encounter the "seeds".
  • the resultant fouling on the boiler heat transfer surfaces is less adhesive, larger in particle size, and easier to remove.
  • the invention retains particulates or fume in suspension that otherwise would have fallen out of suspension and attached to heat transfer surfaces of the boiler. The fouling rate of the boiler is thereby reduced.
  • the preferred location to obtain the salt-cake is from the electrostatic precipitator ash hoppers, as this is likely to be the best quality material.
  • the generating bank ash hopper and the economizer ash hopper are also suitably employable. It may be desirable to add a drying mechanism to dry any salt-cake obtained from the generating, economizer or precipitator ash hoppers.
  • the salt-cake particles are suitably charged with an electrostatic charge of the same polarity of the overall charge of the boiler surfaces by charging device 122.
  • the charging device is suitably placed in the conveyance stream, so as to charge the particles just before they are introduced back into the furnace. This charge will result in the injected material and also the seeded or agglomerated fume to tend to avoid the boiler heat transfer surfaces by electrostatic repelling forces, lessening the likelihood that the material will come to rest on the boiler surfaces and increasing the chance that the material will remain suspended in the flue gas to exit the boiler until reaching the precipitators.
  • the applied charge can be chosen to be opposite that of the suspended material in the flue gas.
  • any oppositely charged particles in the flue gas stream will be attracted and more likely to join with the injected salt-cake.
  • other materials can be combined with or applied to the salt-cake prior to injection into the boiler.
  • the recycled salt-cake can be mixed with MgO or other dry or liquid form materials can be mixed with or sprayed onto the salt-cake. If liquid form material is applied, the salt-cake can alternatively be dried thereafter, prior to injection into the boiler.
  • a further embodiment of the invention adds the step of treating the salt-cake prior to injection, to raise the melting temperature and/or increase the heat capacity of the salt-cake.
  • Suitable ways to accomplish the treatment comprise chemical treatment or mixing of the salt-cake with other components.
  • the salt-cake is suitably frozen or otherwise cooled prior to injection in an alternative treatment process.
  • Suitable methods of freezing the salt-cake include using liquid nitrogen, for example, or a conventional freezing plant which pre-processes the salt-cake to a desired temperature before injection. Quantities of salt-cake may be processed in advance and stored for use, or may be frozen on demand.
  • the salt-cake is injected within the boiler to create a blanket of particles that will fall through the rising gases in the boiler to intercept fume and carryover, ultimately depositing below on the char bed.
  • the pellet size and injection spray pattern are suitably varied to adapt to the particular gas flow and fume characteristics of a given individual boiler.
  • the material that accumulates on the boiler generating bank and economizer tubes is not as strongly adhered thereto as compared with the material that heretofore would cool on the tubes.
  • Conventional sootblower action is thereby able to much more easily clean the boiler tubes, reducing the need for shutdown for cleaning, increasing the run time of the boiler, reducing the plugage rate, reducing the sootblower duty cycle, and reducing the amount of steam used for cleaning.
  • any manual cleaning or water wash via the sootblowers of the boiler tubes that would be necessary is reduced and made much easier, as the material is not fused to the boiler tubes to the extent that it would have been in accordance with the prior art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Paper (AREA)
  • Treating Waste Gases (AREA)
  • Incineration Of Waste (AREA)

Abstract

Cet appareil (12) conçu pour sélectionner des particules de sulfate de soude d'un calibre sensiblement uniforme à partir d'un courant de récupération de sel inorganique d'une chaudière de récupération (10), puis injecter lesdites particules dans le courant de gaz de combustion (42) de la chaudière. Cela permet «d'ensemencer» la fumée de sodium et les particules qui s'élèvent avec la fumée afin de créer une plus grande particule de salissure de la chaudière. Cette particule de salissure plus grande adhère moins aux surfaces de transfert thermique (51, 116, 118) de la chaudière que ses homologues «non ensemencés». L'augmentation du calibre combiné à la moindre adhésion permet une élimination plus facile et plus rapide, d'où une plus grande efficacité de la chaudière. Le ramonage (50) conventionnel par soufflage de suie donne une meilleure élimination des dépôts dans les tuyaux de la chaudière, ce qui en augmente la longévité et en réduit le taux d'obturation.
PCT/US1999/027028 1998-11-16 1999-11-16 Procede et appareil d'injection de sulfate de soude dans une chaudiere de recuperation Ceased WO2000029666A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US10866298P 1998-11-16 1998-11-16
US60/108,662 1998-11-16
US44068599A 1999-11-16 1999-11-16
US09/440,685 1999-11-16

Publications (2)

Publication Number Publication Date
WO2000029666A1 true WO2000029666A1 (fr) 2000-05-25
WO2000029666A8 WO2000029666A8 (fr) 2000-09-14

Family

ID=26806133

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/027028 Ceased WO2000029666A1 (fr) 1998-11-16 1999-11-16 Procede et appareil d'injection de sulfate de soude dans une chaudiere de recuperation

Country Status (1)

Country Link
WO (1) WO2000029666A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1728919A1 (fr) * 2005-06-02 2006-12-06 Kvaerner Power Oy Arrangement dans une chaudière de récuperation
WO2007085490A1 (fr) * 2006-01-30 2007-08-02 Gks - Gemeinschaftskraftwerk Schweinfurt Gmbh Dispositif et procédé destinés à séparer des polluants dans un gaz de fumée d'une installation thermique
US7735435B2 (en) 2006-05-24 2010-06-15 Diamond Power International, Inc. Apparatus for cleaning a smelt spout of a combustion device
US9102951B2 (en) 2011-08-31 2015-08-11 Iogen Energy Corporation Process for recovering salt during a lignocellulosic conversion process
EP3002366A1 (fr) * 2014-10-03 2016-04-06 Valmet Technologies Oy Agencement et procédé dans une chaudière de récupération de soude
WO2018026780A1 (fr) * 2016-08-04 2018-02-08 Fuel Tech, Inc. Contrôle de dépôt pour une chaudière de récupération de liqueur noire
EP3339505A1 (fr) * 2016-12-22 2018-06-27 Valmet Technologies Oy Chaudière de récupération chimique
EP3418445A1 (fr) * 2017-06-20 2018-12-26 Valmet Automation Oy Procede de controle d'une chaudiere de recuperation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5340440A (en) * 1991-09-09 1994-08-23 A. Ahlstrom Corporation Method for recovering chemicals using recovery boiler having at least 2 different melt sections
US5626651A (en) * 1992-02-18 1997-05-06 Francis A. L. Dullien Method and apparatus for removing suspended fine particles from gases and liquids

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5340440A (en) * 1991-09-09 1994-08-23 A. Ahlstrom Corporation Method for recovering chemicals using recovery boiler having at least 2 different melt sections
US5626651A (en) * 1992-02-18 1997-05-06 Francis A. L. Dullien Method and apparatus for removing suspended fine particles from gases and liquids

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7587994B2 (en) 2005-06-02 2009-09-15 Kvaerner Power Oy Arrangement in recovery boiler
EP1728919A1 (fr) * 2005-06-02 2006-12-06 Kvaerner Power Oy Arrangement dans une chaudière de récuperation
WO2007085490A1 (fr) * 2006-01-30 2007-08-02 Gks - Gemeinschaftskraftwerk Schweinfurt Gmbh Dispositif et procédé destinés à séparer des polluants dans un gaz de fumée d'une installation thermique
US7735435B2 (en) 2006-05-24 2010-06-15 Diamond Power International, Inc. Apparatus for cleaning a smelt spout of a combustion device
US9102951B2 (en) 2011-08-31 2015-08-11 Iogen Energy Corporation Process for recovering salt during a lignocellulosic conversion process
US10119700B2 (en) 2014-10-03 2018-11-06 Valmet Technologies Oy Arrangement and method in soda recovery boiler
EP3002366A1 (fr) * 2014-10-03 2016-04-06 Valmet Technologies Oy Agencement et procédé dans une chaudière de récupération de soude
WO2018026780A1 (fr) * 2016-08-04 2018-02-08 Fuel Tech, Inc. Contrôle de dépôt pour une chaudière de récupération de liqueur noire
CN109690265A (zh) * 2016-08-04 2019-04-26 燃料技术公司 用于黑液回收锅炉的沉积物控制
EP3339505A1 (fr) * 2016-12-22 2018-06-27 Valmet Technologies Oy Chaudière de récupération chimique
US10260744B2 (en) 2016-12-22 2019-04-16 Valmet Technologies Oy Chemical recovery boiler
EP3418445A1 (fr) * 2017-06-20 2018-12-26 Valmet Automation Oy Procede de controle d'une chaudiere de recuperation
CN109099442A (zh) * 2017-06-20 2018-12-28 维美德自动化有限公司 用于控制回收锅炉的方法

Also Published As

Publication number Publication date
WO2000029666A8 (fr) 2000-09-14

Similar Documents

Publication Publication Date Title
US8043478B2 (en) Retort heating apparatus
US4144088A (en) Process of reclaiming used foundry sand
US4354450A (en) Jet layer granulator
AU596064B2 (en) Method for improving solids distribution in a circulating fluidized bed system
US5320051A (en) Flyash injection system and method
EP0628767B1 (fr) Réacteur à lit fluidisé et méthode pour son fonctionnement
KR20000062384A (ko) 순환식 유동층 증기 발생기의 연료 및 흡착제 공급 방법 및 장치
US5282430A (en) Flyash injection system and method
WO1994006722A1 (fr) Procede, appareil et module de prechauffage de la composition et de depollution utilises dans la fabrication du verre
WO2000029666A1 (fr) Procede et appareil d'injection de sulfate de soude dans une chaudiere de recuperation
EP0587426B1 (fr) Réacteur et procédé pour réduire les émissions d'oxides de soufre dans un procédé de combustion
US4118309A (en) Separation and recovery of heat carriers in an oil shale retorting process
CN116951422A (zh) 一种垃圾焚烧炉高温烟气处理系统
US5603910A (en) Method for pollution emission reduction from glass melting furnaces
US4290786A (en) Apparatus for removing particulate matter from a gas stream
US20050169613A1 (en) Retort heating systems and methods of use
US6817304B2 (en) Process for generating heat to reduce the emission of oxides of sulphur and reduce adsorbent consumption
US4370309A (en) Method for removing carbon black deposits
US2978378A (en) Method and apparatus for cleaning heat exchange apparatus connected to receive flue gases from soda recovery-boilers
US5167931A (en) SO2 control using moving granular beds
GB2109100A (en) Rotary kiln coal gasifier with tar injection to suppress dust entrainment in gas
CA1117756A (fr) Methode et dispositif d'agglomeration de dechets solides non combustibles
JPH10110924A (ja) 循環流動層燃焼装置の異物排出装置及び異物排出方法
WO1988004013A1 (fr) Procede de purification de gaz de fumee
JP2667467B2 (ja) 黒液燃焼ボイラおよびその燃焼法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA FI PT SE

AK Designated states

Kind code of ref document: C1

Designated state(s): BR CA FI JP PT SE

CFP Corrected version of a pamphlet front page
CR1 Correction of entry in section i

Free format text: PAT. BUL. 21/2000 UNDER (81) ADD "BR, JP"; DUE TO LATE TRANSMITTAL BY THE RECEIVING OFFICE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)