DE3711503A1 - Ammonia removal from combustion ash esp. fly ash - using small amt. of water, and drying under alkaline conditions with reduced drying energy - Google Patents

Ammonia removal from combustion ash esp. fly ash - using small amt. of water, and drying under alkaline conditions with reduced drying energy

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Publication number
DE3711503A1
DE3711503A1 DE19873711503 DE3711503A DE3711503A1 DE 3711503 A1 DE3711503 A1 DE 3711503A1 DE 19873711503 DE19873711503 DE 19873711503 DE 3711503 A DE3711503 A DE 3711503A DE 3711503 A1 DE3711503 A1 DE 3711503A1
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DE
Germany
Prior art keywords
ash
water
drying
ammonia
alkaline conditions
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.)
Withdrawn
Application number
DE19873711503
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German (de)
Inventor
Ilona Haese
Heinz Dr Koeser
Siegfried Dr Pollmann
Bernhard Dr Vosteen
Herbert Wolf
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.)
Hitachi Zosen Inova Steinmueller GmbH
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L&C Steinmueller GmbH
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Application filed by L&C Steinmueller GmbH filed Critical L&C Steinmueller GmbH
Priority to DE19873711503 priority Critical patent/DE3711503A1/en
Publication of DE3711503A1 publication Critical patent/DE3711503A1/en
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/02—Preparation, purification or separation of ammonia
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/02—Preparation, purification or separation of ammonia
    • C01C1/10—Separation of ammonia from ammonia liquors, e.g. gas liquors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

Sepn. of NH3 and opt. ammonium cpds. from ash from combustion esp. fly ash, involves treating the ash with water and liberating the NH3 under alkaline conditions, if necessary in the presence of a basic additive and drying. The novelty is that the opt. hot ash, coming from ash sepn. is moistened with water and/or steam to a H2O content of max. 15 wt.%. Pref. the ash is mixed with hot water, opt. contg. a basic additive and pref. contg. a wetting agent to reduce the surface tension. Removal of the NH3 liberated is assisted by purging air in contact drying of the ash. USE/ADVANTAGE - The drying energy can be reduced (cf. the usual method in which the ash is made into a cake with 30-40 wt.% water). The process is useful for removing residual NH3 and ammonium cpds. used to reduce the NOx content of the flue gas e.g. from power stations.

Description

Die Erfindung betrifft ein Verfahren der im Oberbegriff des vorstehenden Anspruches 1 genannten Art.The invention relates to a method in the preamble of aforementioned claim 1 Art.

Bei der Minderung der Stickoxidgehalte in Rauchgasen von Feuerungen werden Ammoniak und Ammoniakvorstufen eingesetzt. Soweit das Ammoniak vor der Staubabscheidung eingesetzt wird, werden die Aschen mehr oder weniger stark mit Ammoniumverbindungen verunreinigt.When reducing nitrogen oxide levels in flue gases from Furnaces become ammonia and ammonia precursors used. So much for the ammonia before dust separation is used, the ashes become more or less strong contaminated with ammonium compounds.

Bei gewissen Einsatzgebieten der Asche stören erhöhte Ammoniumgehalte. Aus der DE-Zeitschrift VGB "Kraftwerkstechnik" 66, (1986) Heft 9, Seite 865 sind verschiedene Möglichkeiten der Ammoniakabtrennung bekannt. Zu den chemischen Verfahren zählt die Alkalisierung der Aschen. Da Ammoniak eine schwache Base ist, wird es aus wäßriger Lösung von stärkeren Basen verdrängt. Zur Erzielung eines hohen pH-Wertes werden nach einer Aufschlämmung mit Wasser - je nach Charakter der Aschen - unterschiedliche Mengen eines basischen Additives, z. B. Kalkhydrat zugesetzt. Die Freisetzung erfolgt langsam; das dabei austretende Ammoniak muß abgeführt werden.In certain areas of application, the ash is a problem Ammonium levels. From the DE magazine VGB "Kraftwerkstechnik" 66, (1986) Issue 9, page 865 different ways of ammonia separation known. The chemical processes include the alkalization of Ashes. Because ammonia is a weak base, it will run out aqueous solution displaced by stronger bases. To Achieving a high pH is after a Slurry with water - depending on the character of the ashes - different amounts of a basic additive, e.g. B. Hydrated lime added. The release is slow; the escaping ammonia must be removed.

Bei der Aufschlämmung muß für den anfallenden und 30-40 Gew.-% Wasser enthaltenden Aschekuchen Trocknungsenergie in großem Maße aufgebracht werden. The slurry must be used for the accumulated and 30-40 % By weight of water-containing ash cake drying energy be applied to a large extent.  

Es ist daher die Aufgabe der vorliegenden Erfindung, ein Verfahren anzugeben, bei dem die Trocknungsenergie verringert werden kann.It is therefore the object of the present invention Specify the process in which the drying energy can be reduced.

Diese Aufgabe wird dadurch gelöst, daß die gegebenenfalls heiß aus der Ascheabscheidung kommende Asche, insbesondere Flugasche, durch Zumischung von Wasser und/oder Dampf in die Asche bis zu einer H2O-Beladung von höchstens 15 Gew.-% befeuchtet wird.This object is achieved in that the ash, particularly fly ash, which may come hot from the ash separation, is moistened by admixing water and / or steam into the ash to an H 2 O loading of at most 15% by weight.

Erfindungsgemäß wird also die Asche nicht aufgeschlämmt, sondern auf den Oberflächen der Aschepartikel wird ein dünner wäßriger Oberflächenfilm erzeugt. Dies reicht aus, da das Ammoniak bzw. die Ammoniumverbindungen auf der Oberfläche der Aschepartikel auskondensiert sind. Die massebezogene Konzentration der Ammoniumverbindungen steigt mit abnehmender Partikelgröße.According to the invention, the ash is not slurried, but on the surfaces of the ash particles produces a thin aqueous surface film. This is enough since the ammonia or the ammonium compounds on the Surface of the ash particles are condensed. The mass-related concentration of ammonium compounds increases with decreasing particle size.

Beim Eindampfen bzw. Trocknen des Oberflächenfilmes verflüchtigt sich das Ammoniak, und es bleibt eine weitgehend ammoniumfreie trockene Asche, insbesondere Flugstaub zurück.When evaporating or drying the surface film The ammonia evaporates and remains one largely ammonium-free dry ash, especially Dust back.

Vorzugsweise wird heißes Wasser zugemischt, damit die Haufwerkstemperatur der Asche nicht wesentlich unter 90°C sinkt. Bei dieser Temperaturhaltung läßt sich die Freisetzungszeit und die Trocknungszeit in der Regel verkürzen.Hot water is preferably added so that the Pile temperature of the ashes is not significantly below 90 ° C sinks. With this temperature maintenance the Release time and drying time usually shorten.

Da die Oberflächen von Flugaschen häufig Freikalk enthalten, wird der Oberflächenfilm sich in diesen Fällen auf den gewünschten alkalischen Bereich einstellen. Reicht der Freikalkgehalt nicht aus, wird vorzugsweise dem Wasser in an sich bekannter Weise ein basisches Additiv zugesetzt.Because the surfaces of fly ash often free lime contain the surface film in these cases adjust to the desired alkaline range. Enough the free lime content is not sufficient, preferably the water a basic additive is added in a manner known per se.

Zur Verbesserung des Benetzungsverhaltens von Wasser und Dampf und damit zur Minimierung der zur Freisetzung des Ammoniaks notwendigen Wasserbeladung wird in bevorzugter Weise dem Wasser ein geeignetes Netzmittel zur Herabsetzung der Oberflächenspannung beigegeben. Hierzu eignet sich z. B. das unter dem Handelsnamen "Pril" vertriebene Spülmittel.To improve the wetting behavior of water and Steam and thus to minimize the release of the  Ammonia necessary water loading is preferred in Assign a suitable wetting agent to the water Reduced surface tension added. For this is suitable for. B. that under the trade name "Pril" distributed washing up liquid.

Aus der Literaturstelle ist es auch bekannt, das Ammonium mit Chlorgas oder Hypochlorit zu oxidieren. Auch in diesem Falle wird die Flugasche unter Zugabe erheblicher Wassermengen aufgeschlämmt, wobei Ammoniak in Lösung geht und durch Reaktion mit Chlor zu unschädlichen Stickstoffverbindungen oder zu elementarem Stickstoff umgesetzt wird. Es erscheint daher auch bei der erfindungsgemäßen Verfahrensführung unter Umständen von Vorteil, dem zur Befeuchtung eingesetzten Wasser ein Hilfsmittel zur Ammoniumoxidation zuzugeben, wie z. B. Natriumhypochlorit.It is also known from the literature, the ammonium oxidize with chlorine gas or hypochlorite. Also in this Trap the fly ash becomes more substantial with the addition Slurried amounts of water, whereby ammonia dissolves and harmless by reaction with chlorine Nitrogen compounds or elemental nitrogen is implemented. It therefore also appears in the Procedure according to the invention under circumstances of Advantage of the water used for humidification Add tools for ammonium oxidation, such as. B. Sodium hypochlorite.

In besonders einfacher Weise kann bei einer Kontakttrocknung der Asche die Abfuhr des freigesetzten Ammoniaks unterstützt werden, wenn durch die Asche Spülluft geführt wird.In a particularly simple manner Contact drying of the ashes removes the released Ammoniaks are supported when through the ashes Purge air is led.

Apparativ ergibt sich eine besonders wirtschaftliche Verfahrensführung, wenn die einmischende Befeuchtung und die Trocknung in einem mit Einbauten versehenen Drehrohr- Reaktor erfolgen.The apparatus results in a particularly economical one Procedure when the humidification and interference drying in a built-in rotary tube Reactor.

Für die Wasserbeladung bei Befeuchtung wird in der Regel ein Wasserzusatz von ≦5 Gew.-% ausreichen. Der für die Durchführung des Verfahrens zu verwendende Befeuchter/Mischer ist so auszulegen, daß eine möglichst gleichmäßige Verteilung der wäßrigen Phase auf den Partikeln des Asche-Haufwerkes, insbesondere Flugstaub- Haufwerkes, erzielt wird. Die Güte dieser Verteilung bestimmt den Bedarf an Wasser. Hierbei ist es von besonderem Vorteil, daß durch die halbtrockene Verfahrensführung das angefeuchtete Haufwerk seine rieselfähige Konsistenz nicht einbüßt.As a rule, for water loading when humidifying a water addition of ≦ 5% by weight is sufficient. The one for the Execution of the method to be used Humidifier / mixer should be designed so that one is possible uniform distribution of the aqueous phase on the Particles of the ash pile, in particular flue dust Pile, is achieved. The goodness of this distribution determines the need for water. Here it is from particular advantage that through the semi-dry Process control of the moistened pile  free-flowing consistency does not lose.

Die Erfindung soll nun anhand der Figur und an Beispielen näher erläutert werden.The invention is now based on the figure and Examples are explained in more detail.

Flugstaub (F) mit einer Ammoniakbeladung von 50-2000 mg NH3/kg wird in einen Befeuchter/Mischer (1) eingebracht, dem über eine Leitung (2) oder getrennte Leitungen Wasser und/oder Dampf und ggf. Kalkmilch zugeführt wird. Das Aufbringen der H2O-Beladung erfolgt vorzugsweise durch Aufdüsen des Wassers und/oder des Dampfes auf im Befeuchter/Mischer (1) bewegte Flugasche. Dem Mischer ist eine Mischeinrichtung (3) zugeordnet. Es wird so viel flüssige Phase zugeführt, daß der Flugstaub eine H2O-Beladung von höchstens 15 Gew.-% erfährt. Der so befeuchtete Flugstaub wird in einen Konditionierer (4) überführt, in dem er so lange verbleibt, bis die oberflächlichen Ammoniumsalze und das anhaftende Ammoniak gelöst werden. Die Ammoniumsalze können mit den OH-Ionen des Wassers unter Bildung von Ammoniak reagieren. Aus dem Konditionierer (4) wird der Flugstaub in einen Trockner (5) überführt, dem Wärme (Q) über eine Leitung (6) zugeführt wird. Als Wärmeträger eignen sich Rauchgas oder Dampf. Aus dem Trockner (5) wird der Flugstaub mit einem Ammoniak-Gehalt von höchstens 50 mg NH3/kg abgezogen. Der Trockner wird über eine Leitung (7) mit Spülluft beaufschlagt, um das freigesetzte NH3 aus dem Trockner abzuführen. Die NH3-haltigen Brüden werden zusammen mit den bereits beim Befeuchten entstehenden NH3-haltigen Brüden über Leitung (8) abgezogen und z. B. der Feuerung zugeführt. Der Flugstaub (F) tritt mit einer durchschnittlichen Temperatur von 150°C aus dem Elektrofilter aus. Er wird durch die Zugabe von heißem Dampf und Wasser und gegebenenfalls durch Zugabe der Additivaufschlämmung so befeuchtet, daß die Haufwerkstemperatur im wesentlichen nicht unter 90°C absinkt. Es kann dabei erforderlich sein, heißes Wasser zu verwenden. Flying dust (F) with an ammonia load of 50-2000 mg NH 3 / kg is introduced into a humidifier / mixer ( 1 ), to which water and / or steam and possibly milk of lime is fed via a line ( 2 ) or separate lines. The H 2 O load is preferably applied by spraying the water and / or steam onto fly ash moved in the humidifier / mixer ( 1 ). A mixer ( 3 ) is assigned to the mixer. So much liquid phase is supplied that the flying dust experiences an H 2 O loading of at most 15% by weight. The flight dust moistened in this way is transferred to a conditioner ( 4 ) in which it remains until the surface ammonium salts and the adhering ammonia are dissolved. The ammonium salts can react with the OH ions in the water to form ammonia. The flying dust is transferred from the conditioner ( 4 ) to a dryer ( 5 ), to which heat (Q ) is fed via a line ( 6 ). Flue gas or steam are suitable as heat carriers. The fly dust with an ammonia content of at most 50 mg NH 3 / kg is drawn off from the dryer ( 5 ). The dryer is supplied with purge air via a line ( 7 ) in order to remove the released NH 3 from the dryer. The NH 3 -containing vapors are extracted together with the resultant already when wetted NH 3 -containing vapors via line (8) and z. B. fed to the furnace. The fly dust (F) exits the electrostatic filter at an average temperature of 150 ° C. It is moistened by the addition of hot steam and water and, if appropriate, by the addition of the additive slurry, in such a way that the pile temperature does not essentially drop below 90 ° C. It may be necessary to use hot water.

Für die Trocknungsstufe (5) kann ein an den betrieblichen Erfordernissen und Gegebenheiten angepaßter Kontakt- oder Konvektionstrockner eingesetzt werden.A contact or convection dryer adapted to the operational requirements and conditions can be used for the drying stage ( 5 ).

Es ist aber auch denkbar, die apparativen Baugruppen (1, 4 und 5) in einem Aggregat zusammenzufassen. Dieses kann z. B. ein mit geeigneten Einbauten versehener Drehrohr- Reaktor sein.However, it is also conceivable to combine the apparatus assemblies ( 1, 4 and 5 ) in one unit. This can e.g. B. be a rotary tube reactor provided with suitable internals.

Beispiel 1example 1

20 g Flugstaub werden mit einem Wasserzusatz von 100 g H2O/kg Flugstaub ohne Benetzungsmittel befeuchtet. Nach einer Trocknungszeit von 1,5 Stunden bei einer Trocknungstemperatur von 110°C wird der NH4-Endgehalt von 918 mg/kg auf 72 mg/kg reduziert, was einer NH4-Minderung von 92% entspricht.20 g of fly dust are moistened with a water additive of 100 g H 2 O / kg fly dust without wetting agent. After a drying time of 1.5 hours at a drying temperature of 110 ° C, the final NH 4 content is reduced from 918 mg / kg to 72 mg / kg, which corresponds to a NH 4 reduction of 92%.

Beispiel 2Example 2

20 g Flugstaub werden mit einem Wasserzusatz, dem seinerseits etwas "Pril" zugesetzt worden ist, von 100 g H2O/kg befeuchtet. Nach einer Trocknungszeit von 1,5 Stunden bei einer Trocknungstemperatur von 150°C beträgt der NH4-Endgehalt 44 mg/kg, was einer NH4-Minderung von 95% entspricht.20 g of flying dust are moistened with 100 g of H 2 O / kg with a water additive to which a little "Pril" has been added. After a drying time of 1.5 hours at a drying temperature of 150 ° C, the final NH 4 content is 44 mg / kg, which corresponds to a NH 4 reduction of 95%.

Beispiel 3Example 3

Bei 10 g Flugstaub und einem Wasserzusatz von 50 g H2O/kg Flugstaub ohne "Pril"-Zusatz wird nach einer Trocknungszeit von 1,3 Stunden bei 150°C eine NH4- Minderung von immer noch 89% erreicht.With 10 g of fly dust and a water addition of 50 g H 2 O / kg fly dust without "Pril" addition, a NH 4 reduction of still 89% is achieved after a drying time of 1.3 hours at 150 ° C.

Claims (5)

1. Verfahren zum Abtrennen von Ammoniak und ggf. Ammoniumverbindungen aus Feuerungsasche, insbesondere Flugasche, bei der die Feuerungsasche mit Wasser behandelt und der Ammoniak unter alkalischen Bedingungen ggf. unter Zugabe eines basischen Additivs und unter Trocknung freigesetzt wird, dadurch gekennzeichnet, daß die ggf. heiß aus der Ascheabscheidung kommende Asche durch Zumischung von Wasser und/oder Dampf in die Asche bis zu einer H2O-Beladung von höchstens 15 Gew.-% befeuchtet wird.1. A process for separating ammonia and possibly ammonium compounds from combustion ash, in particular fly ash, in which the combustion ash is treated with water and the ammonia is released under alkaline conditions, if appropriate with the addition of a basic additive and with drying, characterized in that the hot ashes coming from the ash separation are moistened by adding water and / or steam to the ashes up to an H 2 O load of at most 15% by weight. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß heißes Wasser zugemischt wird.2. The method according to claim 1, characterized characterized that hot water is admixed. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß dem Wasser in an sich bekannter Weise ein basisches Additiv zugesetzt wird.3. The method according to claim 1 or 2, characterized characterized in that the water in a basic additive is known to be added becomes. 4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß dem Wasser ein Netzmittel zur Herabsetzung der Oberflächenspannung beigegeben wird.4. The method according to any one of claims 1 to 3, characterized in that the Water a wetting agent to reduce the Surface tension is added. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß bei einer Kontakttrocknung der Asche die Abfuhr des freigesetzten Ammoniaks durch Spülluft unterstützt wird.5. The method according to any one of claims 1 to 4, characterized in that at a contact drying of the ashes the removal of the released ammonia is supported by purge air.
DE19873711503 1987-04-04 1987-04-04 Ammonia removal from combustion ash esp. fly ash - using small amt. of water, and drying under alkaline conditions with reduced drying energy Withdrawn DE3711503A1 (en)

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Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4041380A1 (en) * 1990-12-21 1992-07-02 Martin Umwelt & Energietech METHOD FOR RECOVERY OR RECOVERY FOR DISPOSAL OF AMMONIAK OR AMMONIUM COMPOUNDS OF MIXTURES
DE4041379A1 (en) * 1990-12-21 1992-07-02 Martin Umwelt & Energietech METHOD FOR RECOVERY OR RECOVERY FOR DISPOSAL OF AMMONIAK OR AMMONIUM COMPOUNDS OF MIXTURES AND WASHING WATER
EP0538647A1 (en) * 1991-10-24 1993-04-28 Von Roll Ag Method for recovery of ammonia from residues of stack gases
WO2000050123A1 (en) * 1999-02-24 2000-08-31 Separation Technologies, Inc. Method for removing ammonia from ammonia contaminated fly ash
US6290066B1 (en) * 1998-03-26 2001-09-18 Board Of Control For Michigan Technological University Method for removal of ammonia from fly ash
EP1155732A1 (en) * 2000-05-15 2001-11-21 Reatec GmbH Process for treating residues from flue gas purification and/or flue gas desulphurisation plant
EP1296907A1 (en) * 2000-03-08 2003-04-02 ISG Resources, Inc. Control of ammonia emission from ammonia-laden fly ash in concrete
WO2006029190A2 (en) * 2004-09-08 2006-03-16 Headwaters Incorporated Method and device for pre-treating fly ash
US7329397B2 (en) 2005-09-02 2008-02-12 Boral Material Technologies Inc. Method of removing ammonia from fly ash and fly ash composition produced thereby
US8124036B1 (en) 2005-10-27 2012-02-28 ADA-ES, Inc. Additives for mercury oxidation in coal-fired power plants
US8372362B2 (en) 2010-02-04 2013-02-12 ADA-ES, Inc. Method and system for controlling mercury emissions from coal-fired thermal processes
US8383071B2 (en) 2010-03-10 2013-02-26 Ada Environmental Solutions, Llc Process for dilute phase injection of dry alkaline materials
US8496894B2 (en) 2010-02-04 2013-07-30 ADA-ES, Inc. Method and system for controlling mercury emissions from coal-fired thermal processes
US8524179B2 (en) 2010-10-25 2013-09-03 ADA-ES, Inc. Hot-side method and system
US8784757B2 (en) 2010-03-10 2014-07-22 ADA-ES, Inc. Air treatment process for dilute phase injection of dry alkaline materials
US8883099B2 (en) 2012-04-11 2014-11-11 ADA-ES, Inc. Control of wet scrubber oxidation inhibitor and byproduct recovery
US8951487B2 (en) 2010-10-25 2015-02-10 ADA-ES, Inc. Hot-side method and system
US8974756B2 (en) 2012-07-25 2015-03-10 ADA-ES, Inc. Process to enhance mixing of dry sorbents and flue gas for air pollution control
US9017452B2 (en) 2011-11-14 2015-04-28 ADA-ES, Inc. System and method for dense phase sorbent injection
US10350545B2 (en) 2014-11-25 2019-07-16 ADA-ES, Inc. Low pressure drop static mixing system
US10465137B2 (en) 2011-05-13 2019-11-05 Ada Es, Inc. Process to reduce emissions of nitrogen oxides and mercury from coal-fired boilers
CN110917793A (en) * 2019-12-16 2020-03-27 湖南众鑫新材料科技股份有限公司 Method for preparing ammonia water from low-valence vanadium waste gas
US10767130B2 (en) 2012-08-10 2020-09-08 ADA-ES, Inc. Method and additive for controlling nitrogen oxide emissions
US11298657B2 (en) 2010-10-25 2022-04-12 ADA-ES, Inc. Hot-side method and system

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Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4041380A1 (en) * 1990-12-21 1992-07-02 Martin Umwelt & Energietech METHOD FOR RECOVERY OR RECOVERY FOR DISPOSAL OF AMMONIAK OR AMMONIUM COMPOUNDS OF MIXTURES
DE4041379A1 (en) * 1990-12-21 1992-07-02 Martin Umwelt & Energietech METHOD FOR RECOVERY OR RECOVERY FOR DISPOSAL OF AMMONIAK OR AMMONIUM COMPOUNDS OF MIXTURES AND WASHING WATER
US5211926A (en) * 1990-12-21 1993-05-18 Martin Gmbh Fur Umwelt- Und Energietechnik Process for extracting of disposing of ammonia or ammonia compounds from dust mixtures
EP0538647A1 (en) * 1991-10-24 1993-04-28 Von Roll Ag Method for recovery of ammonia from residues of stack gases
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