EP0936405B1 - Circulating fluidized bed boiler with improved NOx reduction - Google Patents
Circulating fluidized bed boiler with improved NOx reduction Download PDFInfo
- Publication number
- EP0936405B1 EP0936405B1 EP99400288A EP99400288A EP0936405B1 EP 0936405 B1 EP0936405 B1 EP 0936405B1 EP 99400288 A EP99400288 A EP 99400288A EP 99400288 A EP99400288 A EP 99400288A EP 0936405 B1 EP0936405 B1 EP 0936405B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flow
- reagent
- boiler
- fluidized bed
- injection tube
- 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.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
- F23C10/10—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
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- 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
- F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2206/00—Fluidised bed combustion
- F23C2206/10—Circulating fluidised bed
- F23C2206/103—Cooling recirculating particles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2219/00—Treatment devices
- F23J2219/20—Non-catalytic reduction devices
Definitions
- the invention relates to a circulating fluidized bed boiler, with a duct which extends in a longitudinal direction and which channels a flow of particles and gases containing nitrogen oxides, and a means for injecting into the flow a reagent making it possible to reduce nitrogen oxides.
- WO 96 21825 describes a bed boiler circulating fluidized additionally comprising an external bed heat exchanger fluidized.
- an injection of reagent, ammonia, to reducing nitrogen oxides is done in the post- / combustion part from the fire or at the entrance to the separation cyclone.
- the object of the invention is to improve the mixing of the reagent with the nitrogen oxides contained in the gases to promote their reduction.
- the invention relates to a fluidized bed boiler circulating with a combustion hearth and a cyclone of separation linked together by a conduit which extends along a longitudinal direction and which channels a flow of particles and gases containing nitrogen oxides, and means for injecting into the stream a reagent for reducing nitrogen oxides, and further comprising an external exchanger with a dense fluidized bed connecting the separation cyclone to the combustion furnace, characterized in that the upper part of said exchanger forms a conduit for the flow of particles and gas which extends in a longitudinal direction and in that said means for injecting said reagent comprises at least one tubular rod placed in said upper part of the exchanger exterior, arranged so as to inject the reagent in the longitudinal direction of the conduit and co-routinely to the flow.
- the reagent is injected right into the flow and in a region of the flow sparse in particles which allows strengthen the mixture with nitrogen oxides and increase the reduction yield.
- a circulating fluidized bed boiler shown schematic in Figure 1, includes a combustion hearth 1 which extends vertically and a lower part of which is supplied by a fuel 3, for example crushed coal, and by a flow air 7 directed towards the top of the fireplace. Combustion takes place within a large mass of fine ash particles 5 strongly agitated and kept in suspension by the air flow 7 to form a fluidized bed having a particle density which decreases rapidly in depending on the height of the fireplace. Combustion takes place at a typical temperature of 850 degrees Celsius (° C) and generates NOx nitrogen oxides.
- the air flow charged with fine particles and nitrogen oxides is channeled in the upper part of the hearth by a first conduit 9 which extends in a longitudinal direction L1 substantially horizontal and which opens into the upper part 11A of a cyclone of separation 11 arranged vertically.
- a first conduit 9 which extends in a longitudinal direction L1 substantially horizontal and which opens into the upper part 11A of a cyclone of separation 11 arranged vertically.
- the fumes 14 exit from the separation cyclone 11 and pass through heat exchangers conventional before being evacuated by a chimney.
- a second conduit 17 forming an upper part of the exchanger exterior 15 extends parallel to a longitudinal direction L2 substantially horizontal and channels the flow of particles and gases from the separation cyclone 11 to the combustion furnace 1 through a fluidized system 19 to recycle the particles.
- a reagent is injected, for example from ammonia in the gaseous state, by means of at least one tubular cane arranged so as to release the reagent in the direction longitudinal of line 17 and co-current with the flow of charged gas particles.
- each tubular rod 21 is disposed in a second conduit 17 formed by an upper part 17A of the external exchanger 15, where the carbon is partially elutriated in particles from the cyclone 11.
- the combustion of elutriated carbon takes place in a strong excess of air above the dense fluidized bed and produces oxides nitrogen which are reduced by injecting the reagent.
- each tubular rod 21 is arranged in relation to the flow current downstream of the entry zone 17B in the second conduit 17 particles from the cyclone 11 to extend the residence time of the reagent, account given the fact that in this entry zone 17B, the carbon elutriation is important.
- Each tubular rod 21 includes, figure 3, at least one injection nozzle 23.
- Each tubular rod 21 is lowered into the second conduit 17, substantially perpendicular to the longitudinal direction L2 and by orienting the injection nozzle 23 in the direction of flow of the flow of particles and gases to inject the reagent according to the longitudinal direction of the conduit and co-current to the flow.
- each injection nozzle 21 in the second conduit 17 is made by means of a flange 25 which preferably allows a translational movement of each rod perpendicular to the longitudinal direction of the duct to adjust the descent in the leads according to a lower density in particles in the flow and thus reinforce the mixing of the reagent with the nitrogen oxides.
- each tubular rod is treated by depositing for example by plasma, a coating of tungsten carbide or carbide chromium.
- a circulation of water 27 The reagent is injected through a channel 29 which opens out through the injection nozzle 23.
- ammonia gas is used, or droplets ammonia solution, or a liquid ammonia precursor like urea in solution, pulsed by air.
Description
L'invention se rapporte à une chaudière à lit fluidisé circulant, avec un conduit qui s'étend suivant une direction longitudinale et qui canalise un flux de particules et de gaz contenant des oxydes d'azote, et un moyen pour injecter dans le flux un réactif permettant de réduire les oxydes d'azote.The invention relates to a circulating fluidized bed boiler, with a duct which extends in a longitudinal direction and which channels a flow of particles and gases containing nitrogen oxides, and a means for injecting into the flow a reagent making it possible to reduce nitrogen oxides.
Dans une chaudière de ce type, avec un conduit reliant un foyer de combustion à un cyclone de séparation, les particules sont séparées dans le cyclone de séparation et sont recyclées dans le foyer de combustion. Les gaz sont évacués par une cheminée après avoir traversé des échangeurs de chaleur conventionnels situés en aval du cyclone de séparation. La réduction des oxydes d'azote en azote moléculaire inerte est une mesure corrective qui permet de diminuer le rejet des oxydes d'azote avec les gaz évacués par la cheminée.In a boiler of this type, with a duct connecting a fireplace combustion at a separation cyclone, the particles are separated in the separation cyclone and are recycled in the combustion hearth. The gases are evacuated through a chimney after have passed through conventional heat exchangers located in downstream of the separation cyclone. Reducing nitrogen oxides to inert molecular nitrogen is a corrective measure which reduce the rejection of nitrogen oxides with the gases evacuated by the fireplace.
D'une manière générale, on injecte dans le flux de particules et de gaz de l'ammoniac pour réduire les oxydes d'azote selon un schéma réactionnel connu sous le nom de réduction sélective non catalytique. Il est admis aujourd'hui que trois principaux paramètres, la température, le temps de séjour, et le mélange de l'ammoniac réactif avec les oxydes d'azote, influencent la réaction de réduction dans l'installation.Generally, we inject into the particle flow and ammonia gas to reduce nitrogen oxides according to a reaction scheme known as selective reduction no Catalytic. It is now accepted that three main parameters, the temperature, residence time, and mixture of reactive ammonia with nitrogen oxides influence the reduction reaction in installation.
Le document WO 96 21825 décrit une chaudière à lit fluidisé circulant comportant en outre un échangeur extérieure à lit fluidisé. Dans ce document, une injection de réactif, de l'ammoniac, pour réduire les oxydes d'azote est faite dans la partie post-/combustion du foyer ou bien à l'entrée du cyclone de séparation. WO 96 21825 describes a bed boiler circulating fluidized additionally comprising an external bed heat exchanger fluidized. In this document, an injection of reagent, ammonia, to reducing nitrogen oxides is done in the post- / combustion part from the fire or at the entrance to the separation cyclone.
Le but de l'invention est d'améliorer le mélange du réactif avec les oxydes d'azote contenus dans les gaz pour favoriser leur réduction.The object of the invention is to improve the mixing of the reagent with the nitrogen oxides contained in the gases to promote their reduction.
A cet effet, l'invention a pour objet une chaudière à lit fluidisé circulant avec un foyer de combustion et un cyclone de séparation reliés entre eux par un conduit qui s'étend suivant une direction longitudinale et qui canalise un flux de particules et de gaz contenant des oxydes d'azote, et un moyen pour injecter dans le flux un réactif permettant dé réduire les oxydes d'azote, et comprenant en outre un échangeur extérieure à lit fluidisé dense reliant le cyclone de séparation au foyer de combustion, caractérisé en ce que la partie supérieure dudit échangeur forme un conduit pour le flux de particules et de gaz qui s'étend suivant une direction longitudinale et en ce que ledit moyen pour injecter ledit réactif comprend au moins une canne tubulaire disposée dans ladite partie supérieure de l'échangeur extérieur, disposée de façon telle à injecter le réactif suivant la direction longitudinale du conduit et de façon co-courante au flux.To this end, the invention relates to a fluidized bed boiler circulating with a combustion hearth and a cyclone of separation linked together by a conduit which extends along a longitudinal direction and which channels a flow of particles and gases containing nitrogen oxides, and means for injecting into the stream a reagent for reducing nitrogen oxides, and further comprising an external exchanger with a dense fluidized bed connecting the separation cyclone to the combustion furnace, characterized in that the upper part of said exchanger forms a conduit for the flow of particles and gas which extends in a longitudinal direction and in that said means for injecting said reagent comprises at least one tubular rod placed in said upper part of the exchanger exterior, arranged so as to inject the reagent in the longitudinal direction of the conduit and co-routinely to the flow.
Avec cet agencement, le réactif est injecté à coeur dans le flux et dans un région du flux peu dense en particules ce qui permet de renforcer le mélange avec les oxydes d'azote et d'augmenter le rendement de réduction.With this arrangement, the reagent is injected right into the flow and in a region of the flow sparse in particles which allows strengthen the mixture with nitrogen oxides and increase the reduction yield.
D'autres caractéristiques et avantages de l'invenfion apparaítront
à la lecture de la description faite
ci-après en référence au dessin annexé dans lequel:
Une chaudière à lit fluidisé circulant, représentée de façon
schématique sur la figure 1, comprend un foyer de combustion 1 qui
s'étend verticalement et dont une partie inférieure est alimentée par
un combustible 3, par exemple du charbon concassé, et par un flux
d'air 7 dirigé vers le haut du foyer. La combustion s'effectue au sein
d'une importante masse de fines particules de cendres 5 fortement
agitées et maintenues en suspension par le flux d'air 7 pour former un
lit fluidisé ayant une densité en particules qui diminue rapidement en
fonction de la hauteur du foyer. La combustion a lieu à une
température typique de 850 degrés celsius (°C) et génère des
d'oxydes d'azote NOx.A circulating fluidized bed boiler, shown
schematic in Figure 1, includes a combustion hearth 1 which
extends vertically and a lower part of which is supplied by
a
Le flux d'air chargé des fines particules et des oxydes d'azote est
canalisé dans la partie haute du foyer par un premier conduit 9 qui
s'étend suivant une direction longitudinale L1 sensiblement
horizontale et qui débouche dans la partie haute 11A d'un cyclone de
séparation 11 disposé verticalement. Par un écoulement circulaire du
flux d'air dans le cyclone, les fines particules de cendre sont séparées
des fumées et sont recyclées vers le foyer de combustion 1 par
l'intermédiaire d'un siphon fluidisé 13. Les fumées 14 sortent du
cyclone de séparation 11 et traversent des échangeurs de chaleur
conventionnels avant d'être évacuées par une cheminée.The air flow charged with fine particles and nitrogen oxides is
channeled in the upper part of the hearth by a
Pour faciliter le contrôle de la température du foyer, on dispose
en parallèle avec le siphon fluidisé 13, un échangeur extérieur à lit
fluidisé dense 15, qui est alimenté en air 16 et en particules prélevées
dans la partie inférieure 11B du cyclone de séparation 11. Un
deuxième conduit 17 formant une partie supérieure de l'échangeur
extérieur 15 s'étend parallèlement à une direction longitudinale L2
sensiblement horizontale et canalise le flux des particules et de gaz
provenant du cyclone de séparation 11 vers le foyer de combustion 1
par l'intermédiaire d'un système fluidisé 19 pour recycler les
particules.To facilitate control of the hearth temperature,
in parallel with the
Selon l'invention, pour réduire les oxydes d'azote contenus dans
les gaz et les fumées, on injecte un réactif, par exemple de
l'ammoniac à l'état gazeux, au moyen d'au moins une canne tubulaire
disposée de façon telle à libérer le réactif suivant la direction
longitudinale du conduit 17 et de façon co-courante au flux de gaz chargé
des particules. According to the invention, to reduce the nitrogen oxides contained in
gases and fumes, a reagent is injected, for example from
ammonia in the gaseous state, by means of at least one tubular cane
arranged so as to release the reagent in the direction
longitudinal of
Ainsi, comme le montre la figure 2, au-moins
une canne tubulaire 21 (deux dans l'exemple décrit) est disposée dans un deuxième conduit 17
formé par une partie supérieure 17A de l'échangeur extérieur 15, où le
carbone est élutrié en partie dans les particules provenant du cyclone
de séparation 11. La combustion du carbone élutrié s'effectue dans un
fort excès d'air au dessus du lit fluidisé dense et produit des oxydes
d'azote qui sont réduits par l'injection du réactif. De préférence,
chaque canne tubulaire 21 est
disposée par rapport au courant du flux en aval de la zone d'entrée
17B dans le deuxième conduit 17 des particules provenant du cyclone
de séparation 11 pour allonger le temps de séjour du réactif, compte
tenu du fait que dans cette zone d'entrée 17B, l'élutriation du carbone
est importante.So, as shown in Figure 2, at least
a tubular rod 21 (two in the example described) is disposed in a
Chaque canne tubulaire 21 comprend, figurer 3, au moins une
buse d'injection 23.
Chaque canne tubulaire 21 est descendue dans le
deuxième conduit 17,
sensiblement perpendiculairement à la direction longitudinale
L2 et en orientant la buse d'injection 23 dans le sens d'écoulement du
flux des particules et des gaz pour injecter le réactif suivant la
direction longitudinale du conduit et de façon co-courante au flux. Each
La fixation de chaque canne d'injection 21 dans le
deuxième conduit 17 est
réalisée au moyen d'une bride 25 qui de préférence permet un
déplacement en translation de chaque canne perpendiculairement à
la direction longitudinale du conduit pour régler la descente dans le
conduit en fonction d'une moindre densité en
particules dans le flux et ainsi renforcer le mélange du réactif avec les
oxydes d'azote.The fixing of each
Il est prévu également de traiter chaque canne tubulaire en
surface pour améliorer ses propriétés de tenue à la corrosion. Compte
tenu de la température du flux et de la nature abrasive des particules
et des gaz, on traite chaque canne en déposant par exemple par
plasma, un revêtement de carbure de tungstène ou de carbure de
chrome. Pour améliorer la tenue mécanique des cannes, on prévoit
également de les refroidir par une circulation d'eau 27. Le réactif est
injecté par un canal 29 qui débouche par la buse d'injection 23.
Comme réactif, on utilise de l'ammoniac gazeux, ou des gouttelettes
d'ammoniaque en solution, ou un précurseur liquide de l'ammoniac
comme l'urée en solution, pulsé par de l'air.It is also planned to treat each tubular rod in
surface to improve its corrosion resistance properties. Account
given the temperature of the flux and the abrasive nature of the particles
and gases, each rod is treated by depositing for example by
plasma, a coating of tungsten carbide or carbide
chromium. To improve the mechanical strength of the rods, provision is made
also to cool them by a circulation of
Claims (6)
- A circulating fluidized bed boiler having a combustion hearth and a separator cyclone (11) interconnected by a duct (9) which extends along a longitudinal axis (L1) and which channels a flow of particles and of gas containing nitrogen oxides (NOx), and means for injecting into the flow a reagent that enables the nitrogen oxides to be reduced, and the boiler further comprising an external dense fluidized bed heat exchanger (15) connecting the separator cyclone (11) to the combustion hearth (1), the boiler being characterized in that the top portion (17A) of said exchanger forms a duct (17) for a flow of particles and gas extending along a longitudinal axis (L2), and in that said means for injecting said reagent comprises at least one injection tube (21) disposed in said top portion (17A) of the external heat exchanger (15) to inject the reagent into said flow and disposed so as to inject the reagent along said longitudinal axis (L2) of the duct (17) and in the same direction as the flow.
- A boiler according to claim 1, in which each injection tube (21) has at least one reagent injection nozzle (23).
- A boiler according to claim 1 or claim 2, in which each injection tube (21) is movable in a direction that is substantially perpendicular to the longitudinal axis (L1, L2) of the duct (9, 17).
- A boiler according to any one of claims 1 to 3, in which each injection tube (21) has a cooling circuit (27) using a flow of water.
- A boiler according to any one of claims 1 to 4, in which each injection tube (21) has a plasma coating of tungsten carbide or of chromium carbide for withstanding abrasion by the flow.
- A boiler according to any preceding claim, in which the reagent is gaseous ammonia, or droplets of ammonia in solution, or of a liquid precursor of ammonia such as urea in solution, driven by air.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9801839 | 1998-02-16 | ||
FR9801839A FR2775061B1 (en) | 1998-02-16 | 1998-02-16 | CIRCULATING FLUIDIZED BED BOILER WITH IMPROVED NITROGEN OXIDE REDUCTION |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0936405A1 EP0936405A1 (en) | 1999-08-18 |
EP0936405B1 true EP0936405B1 (en) | 2004-08-18 |
Family
ID=9523008
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99400288A Expired - Lifetime EP0936405B1 (en) | 1998-02-16 | 1999-02-09 | Circulating fluidized bed boiler with improved NOx reduction |
Country Status (7)
Country | Link |
---|---|
US (1) | US6067943A (en) |
EP (1) | EP0936405B1 (en) |
CN (1) | CN1135319C (en) |
DE (1) | DE69919424T2 (en) |
ES (1) | ES2227980T3 (en) |
FR (1) | FR2775061B1 (en) |
MX (1) | MXPA99001556A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7670569B2 (en) | 2003-06-13 | 2010-03-02 | Mobotec Usa, Inc. | Combustion furnace humidification devices, systems & methods |
US8069825B1 (en) | 2005-11-17 | 2011-12-06 | Nalco Mobotec, Inc. | Circulating fluidized bed boiler having improved reactant utilization |
US8069824B2 (en) | 2008-06-19 | 2011-12-06 | Nalco Mobotec, Inc. | Circulating fluidized bed boiler and method of operation |
DE102010036749A1 (en) | 2010-07-19 | 2012-01-19 | Heizkraftwerksgesellschaft Cottbus Mbh | Method for reducing deposits in boilers, involves inserting fresh water in combustion chamber, particularly in proximity of boiler tube during current operation |
US8449288B2 (en) | 2003-03-19 | 2013-05-28 | Nalco Mobotec, Inc. | Urea-based mixing process for increasing combustion efficiency and reduction of nitrogen oxides (NOx) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2803020B1 (en) * | 1999-12-22 | 2002-04-12 | Abb Alstom Power Comb | PROCESS FOR REDUCING NITROGEN OXIDE EMISSIONS IN A FLUIDIZED BED COMBUSTION PLANT |
US6269778B1 (en) * | 1999-12-17 | 2001-08-07 | The Babcock & Wilcox Company | Fine solids recycle in a circulating fluidized bed |
US8353698B2 (en) * | 2003-06-13 | 2013-01-15 | Nalco Mobotec, Inc. | Co-axial injection system |
US8251694B2 (en) | 2004-02-14 | 2012-08-28 | Nalco Mobotec, Inc. | Method for in-furnace reduction flue gas acidity |
WO2008137548A1 (en) * | 2007-05-01 | 2008-11-13 | Phase Inc. | Methods and apparatus for classification of suspended materials |
US8555797B2 (en) * | 2007-05-10 | 2013-10-15 | Alstom Technology Ltd | System and method for decreasing NOx emissions from a fluidized bed combustion system |
AT505526B1 (en) * | 2007-08-14 | 2010-09-15 | Univ Wien Tech | FLUID BED REACTOR SYSTEM |
DE102011052788B4 (en) | 2011-08-17 | 2014-03-20 | Harald Sauer | Process and apparatus for purifying exhaust gases |
CN102626586B (en) * | 2012-04-01 | 2014-06-04 | 无锡雪浪环境科技股份有限公司 | Treatment device for emission reduction control over nitrogen oxide in flue gas |
US10746141B2 (en) * | 2017-03-14 | 2020-08-18 | Kohler Co. | Engine air cleaner |
US10653996B1 (en) * | 2019-05-13 | 2020-05-19 | The Babcock & Wilcox Company | Selective non-catalytic reduction (SNCR) of NOx in fluidized bed combustion reactors |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3728557A1 (en) * | 1987-08-27 | 1989-03-09 | Didier Eng | Process for the distribution of ammonia in a gas stream and apparatus for carrying out the process |
SE466814B (en) * | 1989-06-01 | 1992-04-06 | Kvaerner Generator Ab | DEVICE FOR DEGRADATION OF GASES GENERATED FOR PRESENT BURNING AT UNGEFER 850 DEGREES C OF THE SOLID BROWN IN A LIQUID BED |
US5342592A (en) * | 1989-07-04 | 1994-08-30 | Fuel Tech Europe Ltd. | Lance-type injection apparatus for introducing chemical agents into flue gases |
GB2271517A (en) * | 1992-10-14 | 1994-04-20 | Dorr Oliver Inc | Flue gas NOx reduction in a fluidized bed reactor |
US5315941A (en) * | 1993-06-07 | 1994-05-31 | The Babcock & Wilcox Company | Method and apparatus for injecting nox inhibiting reagent into the flue gas of a boiler |
US5465690A (en) * | 1994-04-12 | 1995-11-14 | A. Ahlstrom Corporation | Method of purifying gases containing nitrogen oxides and an apparatus for purifying gases in a steam generation boiler |
US5462718A (en) | 1994-06-13 | 1995-10-31 | Foster Wheeler Energy Corporation | System for decreasing NOx emissions from a fluidized bed reactor |
CH689312A5 (en) * | 1995-01-10 | 1999-02-15 | Von Roll Umwelttechnik Ag | Method for the combustion of waste material with production of thermal energy. |
-
1998
- 1998-02-16 FR FR9801839A patent/FR2775061B1/en not_active Expired - Lifetime
-
1999
- 1999-02-09 EP EP99400288A patent/EP0936405B1/en not_active Expired - Lifetime
- 1999-02-09 ES ES99400288T patent/ES2227980T3/en not_active Expired - Lifetime
- 1999-02-09 DE DE69919424T patent/DE69919424T2/en not_active Expired - Lifetime
- 1999-02-13 CN CNB991027175A patent/CN1135319C/en not_active Expired - Lifetime
- 1999-02-15 MX MXPA99001556A patent/MXPA99001556A/en not_active Application Discontinuation
- 1999-02-16 US US09/250,688 patent/US6067943A/en not_active Expired - Fee Related
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8449288B2 (en) | 2003-03-19 | 2013-05-28 | Nalco Mobotec, Inc. | Urea-based mixing process for increasing combustion efficiency and reduction of nitrogen oxides (NOx) |
US7670569B2 (en) | 2003-06-13 | 2010-03-02 | Mobotec Usa, Inc. | Combustion furnace humidification devices, systems & methods |
US8021635B2 (en) | 2003-06-13 | 2011-09-20 | Nalco Mobotec, Inc. | Combustion furnace humidification devices, systems and methods |
US8069825B1 (en) | 2005-11-17 | 2011-12-06 | Nalco Mobotec, Inc. | Circulating fluidized bed boiler having improved reactant utilization |
US8069824B2 (en) | 2008-06-19 | 2011-12-06 | Nalco Mobotec, Inc. | Circulating fluidized bed boiler and method of operation |
DE102010036749A1 (en) | 2010-07-19 | 2012-01-19 | Heizkraftwerksgesellschaft Cottbus Mbh | Method for reducing deposits in boilers, involves inserting fresh water in combustion chamber, particularly in proximity of boiler tube during current operation |
Also Published As
Publication number | Publication date |
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FR2775061B1 (en) | 2000-03-10 |
FR2775061A1 (en) | 1999-08-20 |
CN1135319C (en) | 2004-01-21 |
CN1226653A (en) | 1999-08-25 |
ES2227980T3 (en) | 2005-04-01 |
DE69919424T2 (en) | 2005-09-08 |
DE69919424D1 (en) | 2004-09-23 |
US6067943A (en) | 2000-05-30 |
MXPA99001556A (en) | 2004-10-28 |
EP0936405A1 (en) | 1999-08-18 |
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