DE4339777A1 - Process and apparatus for reducing metallic mercury content of flue gases - Google Patents

Process and apparatus for reducing metallic mercury content of flue gases

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Publication number
DE4339777A1
DE4339777A1 DE19934339777 DE4339777A DE4339777A1 DE 4339777 A1 DE4339777 A1 DE 4339777A1 DE 19934339777 DE19934339777 DE 19934339777 DE 4339777 A DE4339777 A DE 4339777A DE 4339777 A1 DE4339777 A1 DE 4339777A1
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DE
Germany
Prior art keywords
adsorbents
metallic mercury
gases
coke
hgcl2
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Withdrawn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
DE19934339777
Other languages
German (de)
Inventor
Ralf Dipl Ing Feldhoff
Michael Dipl Ing Ostertag
Peter Dipl In Kleine-Moellhoff
Gerhard Dipl Ing Pfannes
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.)
KRC Umwelttechnik GmbH
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KRC Umwelttechnik GmbH
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Publication date
Application filed by KRC Umwelttechnik GmbH filed Critical KRC Umwelttechnik GmbH
Priority to DE19934339777 priority Critical patent/DE4339777A1/en
Publication of DE4339777A1 publication Critical patent/DE4339777A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/64—Heavy metals or compounds thereof, e.g. mercury
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Treating Waste Gases (AREA)

Abstract

A process for reducing the metallic Hg content of flue gases, especially from sewage sludge incineration plant, uses solid adsorbents such as activated carbon, activated coke, open hearth furnace coke or molecular sieves. The adsorbents may, if necessary, also contain calcium hydroxide, powdered limestone and/or powdered calcium aluminium silicate and/or inert solid materials. The gases are brought into contact with adsorbent materials which are saturated with HgCl2 and/or other Hg(II) compounds. Also claimed is a device for carrying out this process which consists of a flow-stream reactor or fluidised bed reactor containing the solid adsorbent material described above.

Description

Gegenstand der vorliegenden Erfindung ist ein Verfahren und eine Vorrichtung zur Reduzierung des Gehaltes an metallischem Quecksilber von mit metallischem Quecksilber belasteten Rauch­ gasen insbesondere aus Klärschlammverbrennungsanlagen unter Verwendung von festen Adsorbentien wie Aktivkohle, Aktivkoks, Herdofenkoks oder Molekularsieben, die gegebenenfalls zusätz­ lich Calciumhydroxyd, Kalksteinmehl und/oder gemahlene Cal­ ciumaluminiumsilikate und/oder inerte Feststoffe enthalten.The present invention relates to a method and a device for reducing the content of metallic Mercury from smoke contaminated with metallic mercury gas in particular from sewage sludge incineration plants Use of solid adsorbents such as activated carbon, activated coke, Herd coke or molecular sieves, which may be additional Lich calcium hydroxide, limestone flour and / or ground cal contain ciumaluminiumsilikate and / or inert solids.

Ein derartiges Verfahren ist in der DE-A-41 24 844 beschrie­ ben. Das Verfahren hat sich gut bewährt. Ein Nachteil des Verfahrens besteht darin, daß der Verbrauch an festen Adsor­ bentien relativ hoch ist und somit auch relativ viel kostet.Such a method is described in DE-A-41 24 844 ben. The process has worked well. A disadvantage of The method is that the consumption of solid adsor bentien is relatively high and therefore also costs a lot.

Die Erfindung hat sich die Aufgabe gestellt, den Aufwand und die Kosten des bekannten Verfahrens zu reduzieren. Diese Auf­ gabe konnte jetzt überraschend einfach und gut gelöst werden, indem die Gase in Kontakt gebracht werden mit Adsorbentien, die bezüglich HgCl₂ und/oder anderen Hg-(II)-Verbindungen bereits gesättigt sind. Bei den Versuchen, die Adsorbentien möglichst gut auszunutzen und die Beladung mit den zu adsor­ bierenden Stoffen zu optimieren, wurde die überraschende Be­ obachtung gemacht, daß die Adsorbentien relativ rasch gesät­ tigt sind bezüglich HgCl₂ und/oder anderen Hg-(II)-Verbindun­ gen aber ihre Aufnahmekapazität für metallisches Quecksilber erhalten bleibt. Noch überraschender war der Befund, daß bei Verwendung von Adsorbentien, die bezüglich HgCl₂ und/oder anderen Hg-(II)-Verbindungen schon gesättigt sind, der Gehalt an HgCl₂ und/oder anderen Hg-(II)-Verbindungen im Gas nach Kontakt mit den Adsorbentien höher ist als vor dem Kontakt. The invention has set itself the task, the effort and to reduce the cost of the known method. This on gift could now be solved surprisingly easily and well, by bringing the gases into contact with adsorbents, the HgCl₂ and / or other Hg (II) compounds are already saturated. When trying the adsorbents to use as well as possible and to load the adsor optimizing substances, was the surprising Be made care that the adsorbents sown relatively quickly are related to HgCl₂ and / or other Hg (II) compounds but their absorption capacity for metallic mercury preserved. Even more surprising was the finding that Use of adsorbents related to HgCl₂ and / or other Hg (II) compounds are already saturated, the content of HgCl₂ and / or other Hg (II) compounds in the gas Contact with the adsorbents is higher than before contact.  

Eingehende Untersuchungen haben jetzt ergeben, daß die mit HgCl₂ und/oder anderen Hg-(II)-Verbindungen gesättigten Adsor­ bentien in der Lage sind, metallisches Quecksilber in HgCl₂ und/oder andere Hg-(II)-Verbindungen umzuwandeln und, daß diese Umwandlung immer dann stattfindet, wenn der zu reinigen­ de Gasstrom noch gewisse Mengen an Sauerstoff, Chlorwasser­ stoff und/oder Bromwasserstoff, SO₂ und Wasserdampf enthält. Es handelt sich offensichtlich um eine Oxidation des feinst verteilten metallischen Quecksilbers auf den Adsorbentien, da flüssiges metallisches Quecksilber von Rauchgasen gleicher Zusammensetzung nicht angegriffen wird. Sofern also andere Abgase als Rauchgase eine ähnliche Zusammensetzung besitzen, kann auch aus ihnen das metallische Quecksilber entfernt bzw. umgewandelt werden.In-depth investigations have now shown that with HgCl₂ and / or other Hg (II) compounds saturated adsor bentien are able to use metallic mercury in HgCl₂ and / or other Hg (II) compounds and convert that this conversion always takes place when the cleanse de gas flow still have certain amounts of oxygen, chlorinated water contains substance and / or hydrogen bromide, SO₂ and water vapor. It is obviously an oxidation of the finest distributed metallic mercury on the adsorbents because liquid metallic mercury from smoke gases of the same type Composition is not attacked. Unless others Exhaust gases have a similar composition as flue gases, can also remove the metallic mercury from them or being transformed.

Die erfindungsgemäß verwendete Oxidation von metallischem Quecksilber zu HgCl₂ und/oder anderen Hg-(II)-Verbindungen gestattet eine wesentlich längere, wenn nicht sogar nahezu unbegrenzte Verwendung der Adsorbentien.The oxidation of metallic used according to the invention Mercury to HgCl₂ and / or other Hg (II) compounds allows a much longer, if not nearly unlimited use of the adsorbents.

Das erfindungsgemäße Verfahren ist besonders geeignet für Rauchgase, die mit relativ hohen Mengen von metallischem Quecksilber belastet sind. Bereits ein Gehalt von 15 µg/m³ wird als störend und hoch angesehen. Die Rauchgase von reinen Klärschlammverbrennungsanlagen weisen einen Gehalt von 60 bis 1000 µg/m³ Gesamtquecksilber auf, von dem ein Anteil von bis zu 30% metallisches Quecksilber ist. Als weitere Hg-(II)- Verbindungen kommen vor allem das Sulfat und das Bromid in Frage.The method according to the invention is particularly suitable for Flue gases containing relatively high amounts of metallic Mercury are contaminated. Already a content of 15 µg / m³ is considered disruptive and high. The smoke gases from pure Sewage sludge incineration plants have a content of 60 to 1000 µg / m³ total mercury, of which a share of up to is 30% metallic mercury. As further Hg- (II) - Compounds mainly come in the sulfate and bromide Question.

Das erfindungsgemäße Verfahren kann somit auch zum Einsatz kommen in gemischten Verbrennungsanlagen, welche neben anderen Brennstoffen einen gewissen Anteil an Klärschlamm enthalten, wodurch erfahrungsgemäß der Gehalt an metallischem Quecksilber in den Rauchgasen ansteigt. Da auch derartige Rauchgase aus­ reichende Mengen an Sauerstoff, Chlorwasserstoff und/oder Bromwasserstoff, SO₂ und Wasserdampf enthalten, kann bei die­ sen Rauchgasen die erfindungsgemäße Umwandlung von metalli­ schem Quecksilber in HgCl₂ und/oder andere Hg-(II)-Verbindun­ gen durchgeführt werden. Die Entfernung von HgCl₂ und/oder anderen Hg-(II)-Verbindungen ist wesentlich leichter und ein­ facher durchzuführen, so daß alle herkömmlichen bekannten Maßnahmen zur Entfernung von HgCl₂ und/oder anderen Hg-(II)- Verbindungen zum Einsatz kommen können.The method according to the invention can thus also be used come in mixed incinerators, which among others Fuels contain a certain amount of sewage sludge, which, based on experience, shows the content of metallic mercury  increases in the flue gases. Because also such smoke gases sufficient amounts of oxygen, hydrogen chloride and / or Hydrogen bromide, SO₂ and water vapor can contain the Sen flue gases the conversion of metalli according to the invention chemical mercury in HgCl₂ and / or other Hg (II) compound conditions. The removal of HgCl₂ and / or other Hg (II) compounds is much lighter and one to perform facher, so that all conventional known Measures to remove HgCl₂ and / or other Hg- (II) - Connections can be used.

Das Verfahren gemäß DE-A-41 24 844 beschreibt vor allem die Reinigung von Rauchgasen, die eine Vorreinigung und eine vor­ zugsweise zweistufige nasse Rauchgasentschwefelung durchlau­ fen, wobei die Entfernung des Quecksilbers und einigen anderen Verunreinigungen in einem Flugstromreaktor erfolgt, bei dem die beladenen Adsorbentien vorzugsweise durch ein Gewebefilter wieder abgetrennt werden.The process according to DE-A-41 24 844 describes above all that Cleaning flue gases, one pre-cleaning and one pre preferably two-stage wet flue gas desulfurization through blue fen, the removal of the mercury and some others Contamination takes place in an entrained-flow reactor in which the loaded adsorbents preferably through a fabric filter be separated again.

Das erfindungsgemäße Verfahren gestattet eine wesentlich län­ gere und intensivere Nutzung der Adsorbentien. Es kann daher auch in einem Wirbelbett oder in einem durchströmbaren Fest­ bett durchgeführt werden.The method according to the invention permits a substantially longer period more and more intensive use of the adsorbents. It can therefore also in a fluidized bed or in a flowable festival be carried out in bed.

Die Durchführung des Verfahrens erfolgt vorzugsweise in einer Vorrichtung zur Reduzierung des Gehaltes an metallischem Quecksilber von mit metallischem Quecksilber belasteten Rauch­ gasen insbesondere aus Klärschlammverbrennungsanlagen beste­ hend aus einem Flugstromreaktor, einem Wirbelbettreaktor oder einem durchströmbaren Festbett enthaltend feste Adsorbentien, wie Aktivkohle, Aktivkoks, Herdofenkoks oder Molekularsiebe, die gegebenenfalls zusätzlich Calciumhydroxid, Kalksteinmehl und/oder gemahlene Calciumaluminiumsilikate und/oder inerte Feststoffe enthalten, dadurch gekennzeichnet, daß die Adsor­ bentien bezüglich HgCl₂ und/oder anderen Hg-(II)-Verbindungen gesättigt sind. Zu den inerten Feststoffen zählt auch Flug­ asche.The method is preferably carried out in a Device for reducing the content of metallic Mercury from smoke contaminated with metallic mercury best gases especially from sewage sludge incineration plants hend from an entrained flow reactor, a fluidized bed reactor or a flow-through fixed bed containing solid adsorbents, such as activated carbon, activated coke, hearth furnace coke or molecular sieves, the possibly additional calcium hydroxide, limestone powder and / or ground calcium aluminum silicates and / or inert  Contain solids, characterized in that the adsor bentien regarding HgCl₂ and / or other Hg (II) compounds are saturated. Flight is also one of the inert solids ash.

Da die erfindungsgemäß verwendete Umwandlung von metallischem Quecksilber in HgCl₂ und/oder andere Hg-(II)-Verbindungen anscheinend wenig von der Reaktionstemperatur beeinflußt wird, kann die erfindungsgemäße Reduzierung des Gehaltes an metalli­ schem Quecksilber auch in dem üblichen Temperaturbereich von Rauchgasen, nämlich zwischen 70 und 220°C erfolgen. Vorzugs­ weise wird das Verfahren durchgeführt in einem Bereich, der oberhalb des Wassertaupunktes der Rauchgase liegt, damit es nicht zu feuchten Kondensationen auf den Adsorbentien kommt. Der bevorzugte Temperaturbereich liegt somit zwischen 100 und 180°C.Since the conversion of metallic used according to the invention Mercury in HgCl₂ and / or other Hg (II) compounds apparently little is affected by the reaction temperature, can reduce the metal content according to the invention chemical mercury also in the usual temperature range of Flue gases, namely between 70 and 220 ° C. Preferential the method is carried out in an area which is above the water dew point of the flue gases so that it there is no moisture condensation on the adsorbents. The preferred temperature range is therefore between 100 and 180 ° C.

Claims (4)

1. Verfahren zur Reduzierung des Gehalts an metallischem Quecksilber von mit metallischem Quecksilber belasteten Rauchgasen insbesondere aus Klärschlammverbrennungsanla­ gen unter Verwendung von festen Adsorbentien wie Aktiv­ kohle, Aktivkoks, Herdofenkoks oder Molekularsieben, die gegebenenfalls zusätzlich Calciumhydroxid, Kalksteinmehl und/oder gemahlene Calciumaluminiumsilikate und/oder inerte Feststoffe enthalten, dadurch gekennzeichnet, daß die Gase in Kontakt gebracht werden mit Adsorbentien, die bezüglich HgCl₂ und/oder anderen Hg-(II)-Verbindungen gesättigt sind.1. A method for reducing the content of metallic mercury from smoke gases contaminated with metallic mercury, in particular from sewage sludge incineration plants, using solid adsorbents such as activated carbon, activated coke, hearth coke or molecular sieves, which optionally additionally contain calcium hydroxide, limestone powder and / or ground calcium aluminum silicates and / or inert Contain solids, characterized in that the gases are brought into contact with adsorbents which are saturated with respect to HgCl₂ and / or other Hg (II) compounds. 2. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß die zu reinigenden Rauchgase mehr als 15 µg/m³ metalli­ sches Quecksilber enthalten.2. The method according to claim 1, characterized in that the flue gases to be cleaned are more than 15 µg / m³ metalli contain mercury. 3. Verfahren gemäß Anspruch 1 oder 2, dadurch gekennzeich­ net, daß die Adsorbentien in Kontakt gebracht werden in einem Flugstrom, einem Wirbelbett oder einem durchström­ baren Festbett.3. The method according to claim 1 or 2, characterized in net that the adsorbents are brought into contact an entrained flow, a fluidized bed or a flow fixed bed. 4. Vorrichtung zur Reduzierung des Gehalts an metallischem Quecksilber von mit metallischem Quecksilber belasteten Rauchgasen insbesondere aus Klärschlammverbrennungsanla­ gen bestehend aus einem Flugstromreaktor, einem Wirbel­ bettreaktor oder einem durchströmbaren Festbett enthal­ tend feste Adsorbentien wie Aktivkohle, Aktivkoks, Herd­ ofenkoks oder Molekularsiebe, die gegebenenfalls zusätz­ lich Calciumhydroxid, Kalksteinmehl und/oder gemahlene Calciumaluminiumsilikate und/oder inerte Feststoffe ent­ halten, dadurch gekennzeichnet, daß die Adsorbentien bezüglich HgCl₂ und/oder anderen Hg-(II)-Verbindungen gesättigt sind.4. Device for reducing the content of metallic Mercury contaminated with metallic mercury Flue gases, especially from sewage sludge incineration plants gene consisting of an entrained-flow reactor, a vortex bed reactor or a flow-through fixed bed solid adsorbents such as activated carbon, activated coke, stove oven coke or molecular sieves, which may be additional Lich calcium hydroxide, limestone powder and / or ground Calcium aluminum silicates and / or inert solids ent keep, characterized in that the adsorbents with respect to HgCl₂ and / or other Hg (II) compounds are saturated.
DE19934339777 1993-11-23 1993-11-23 Process and apparatus for reducing metallic mercury content of flue gases Withdrawn DE4339777A1 (en)

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Cited By (20)

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EP0808650A1 (en) * 1996-05-18 1997-11-26 Metallgesellschaft Ag Process for removing pollutants from exhaust gases
DE19744470A1 (en) * 1996-10-12 2000-07-13 Mayer Guenter Pressure swing adsorption plant for recovery of materials from gases, removes e.g. polar solvent, especially water from process gases for re-use and releases benign emissions into environment
DE19901049A1 (en) * 1999-01-14 2000-07-20 Ftu Gmbh Forschung Und Tech En Agents for the purification of gases and exhaust gases, processes for producing these agents and their use
WO2001012316A1 (en) * 1999-08-13 2001-02-22 Merrick R T Moe Method and apparatus for treating flare stack gases to reduce toxic emissions
NL1017206C2 (en) * 2001-01-26 2002-07-29 Cdem Holland Bv Method for removing mercury from a gas stream.
DE102005003138A1 (en) * 2005-01-21 2006-07-27 Rwe Power Ag Sorbent, useful for e.g. purification of dry exhaust gas, comprises powdery carbon material that is reduced without addition of further inert components in its reactivity
DE102009057432A1 (en) * 2009-12-09 2011-06-16 Rheinbraun Brennstoff Gmbh Process for the separation of mercury from flue gases of high-temperature plants
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
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
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
US9044710B2 (en) 2011-06-01 2015-06-02 Rheinbraun Brennstoff Gmbh Method for precipitating mercury from flue gases of high-temperature plants
DE102014007746A1 (en) * 2014-05-30 2015-12-03 Rwe Power Aktiengesellschaft A process for removing mercury from the scrubbing suspension of a wet scrubber and adsorbent for use in a wet scrubber
US9669351B2 (en) 2003-06-03 2017-06-06 General Electric Technology Gmbh Removal of mercury emissions
US10465137B2 (en) 2011-05-13 2019-11-05 Ada Es, Inc. Process to reduce emissions of nitrogen oxides and mercury from coal-fired boilers
US10589292B2 (en) 2013-08-16 2020-03-17 ADA-ES, Inc. Method to reduce mercury, acid gas, and particulate emissions
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 (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0808650A1 (en) * 1996-05-18 1997-11-26 Metallgesellschaft Ag Process for removing pollutants from exhaust gases
US5895520A (en) * 1996-05-18 1999-04-20 Metallgesellschaft Aktiengesellschaft Method of separating noxious substances from exhaust gases
DE19744470A1 (en) * 1996-10-12 2000-07-13 Mayer Guenter Pressure swing adsorption plant for recovery of materials from gases, removes e.g. polar solvent, especially water from process gases for re-use and releases benign emissions into environment
DE19901049B4 (en) * 1999-01-14 2011-03-10 Ftu Gmbh Forschung Und Technische Entwicklung Im Umweltschutz Means for the purification of gases and waste gases and their use
DE19901049A1 (en) * 1999-01-14 2000-07-20 Ftu Gmbh Forschung Und Tech En Agents for the purification of gases and exhaust gases, processes for producing these agents and their use
WO2001012316A1 (en) * 1999-08-13 2001-02-22 Merrick R T Moe Method and apparatus for treating flare stack gases to reduce toxic emissions
NL1017206C2 (en) * 2001-01-26 2002-07-29 Cdem Holland Bv Method for removing mercury from a gas stream.
WO2002058823A1 (en) * 2001-01-26 2002-08-01 Cdem Holland B.V. A method for the removal of mercury from a gas stream
US6974564B2 (en) 2001-01-26 2005-12-13 Cdem Holland B.V. Method for the removal of mercury from a gas stream
US9669351B2 (en) 2003-06-03 2017-06-06 General Electric Technology Gmbh Removal of mercury emissions
DE102005003138A1 (en) * 2005-01-21 2006-07-27 Rwe Power Ag Sorbent, useful for e.g. purification of dry exhaust gas, comprises powdery carbon material that is reduced without addition of further inert components in its reactivity
US8124036B1 (en) 2005-10-27 2012-02-28 ADA-ES, Inc. Additives for mercury oxidation in coal-fired power plants
US8293196B1 (en) 2005-10-27 2012-10-23 ADA-ES, Inc. Additives for mercury oxidation in coal-fired power plants
DE102009057432A1 (en) * 2009-12-09 2011-06-16 Rheinbraun Brennstoff Gmbh Process for the separation of mercury from flue gases of high-temperature plants
US9221013B2 (en) 2010-02-04 2015-12-29 ADA-ES, Inc. Method and system for controlling mercury emissions from coal-fired thermal processes
US8372362B2 (en) 2010-02-04 2013-02-12 ADA-ES, Inc. Method and system for controlling mercury emissions from coal-fired thermal processes
US11213787B2 (en) 2010-02-04 2022-01-04 ADA-ES, Inc. Method and system for controlling mercury emissions from coal-fired thermal processes
US10843130B2 (en) 2010-02-04 2020-11-24 ADA-ES, Inc. Method and system for controlling mercury emissions from coal-fired thermal processes
US10427096B2 (en) 2010-02-04 2019-10-01 ADA-ES, Inc. Method and system for controlling mercury emissions from coal-fired thermal processes
US9884286B2 (en) 2010-02-04 2018-02-06 ADA-ES, Inc. Method and system for controlling mercury emissions from coal-fired thermal processes
US8496894B2 (en) 2010-02-04 2013-07-30 ADA-ES, Inc. Method and system for controlling mercury emissions from coal-fired thermal processes
US9352275B2 (en) 2010-02-04 2016-05-31 ADA-ES, Inc. Method and system for controlling mercury emissions from coal-fired thermal processes
US10124293B2 (en) 2010-10-25 2018-11-13 ADA-ES, Inc. Hot-side method and system
US8951487B2 (en) 2010-10-25 2015-02-10 ADA-ES, Inc. Hot-side method and system
US11298657B2 (en) 2010-10-25 2022-04-12 ADA-ES, Inc. Hot-side method and system
US9657942B2 (en) 2010-10-25 2017-05-23 ADA-ES, Inc. Hot-side method and system
US8524179B2 (en) 2010-10-25 2013-09-03 ADA-ES, Inc. Hot-side method and system
US10730015B2 (en) 2010-10-25 2020-08-04 ADA-ES, Inc. Hot-side method and system
US10731095B2 (en) 2011-05-13 2020-08-04 ADA-ES, Inc. Process to reduce emissions of nitrogen oxides and mercury from coal-fired boilers
US11118127B2 (en) 2011-05-13 2021-09-14 ADA-ES, Inc. Process to reduce emissions of nitrogen oxides and mercury from coal-fired boilers
US10465137B2 (en) 2011-05-13 2019-11-05 Ada Es, Inc. Process to reduce emissions of nitrogen oxides and mercury from coal-fired boilers
US9044710B2 (en) 2011-06-01 2015-06-02 Rheinbraun Brennstoff Gmbh Method for precipitating mercury from flue gases of high-temperature plants
US8883099B2 (en) 2012-04-11 2014-11-11 ADA-ES, Inc. Control of wet scrubber oxidation inhibitor and byproduct recovery
US10159931B2 (en) 2012-04-11 2018-12-25 ADA-ES, Inc. Control of wet scrubber oxidation inhibitor and byproduct recovery
US10758863B2 (en) 2012-04-11 2020-09-01 ADA-ES, Inc. Control of wet scrubber oxidation inhibitor and byproduct recovery
US9889405B2 (en) 2012-04-11 2018-02-13 ADA-ES, Inc. Control of wet scrubber oxidation inhibitor and byproduct recovery
US9409123B2 (en) 2012-04-11 2016-08-09 ASA-ES, Inc. Control of wet scrubber oxidation inhibitor and byproduct recovery
US11065578B2 (en) 2012-04-11 2021-07-20 ADA-ES, Inc. Control of wet scrubber oxidation inhibitor and byproduct recovery
US10767130B2 (en) 2012-08-10 2020-09-08 ADA-ES, Inc. Method and additive for controlling nitrogen oxide emissions
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