CN1113883A - Ash ammonia scrubbing - Google Patents

Ash ammonia scrubbing Download PDF

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Publication number
CN1113883A
CN1113883A CN94106272A CN94106272A CN1113883A CN 1113883 A CN1113883 A CN 1113883A CN 94106272 A CN94106272 A CN 94106272A CN 94106272 A CN94106272 A CN 94106272A CN 1113883 A CN1113883 A CN 1113883A
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CN
China
Prior art keywords
ammonia
ash content
floating dust
air
burning
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Pending
Application number
CN94106272A
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Chinese (zh)
Inventor
卢瑟·沃尔芬登
拜恩·费希尔
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Nalco Fuel Tech
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Nalco Fuel Tech
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Filing date
Publication date
Priority to PCT/US1993/009603 priority Critical patent/WO1994008892A1/en
Application filed by Nalco Fuel Tech filed Critical Nalco Fuel Tech
Priority to CN94106272A priority patent/CN1113883A/en
Publication of CN1113883A publication Critical patent/CN1113883A/en
Pending legal-status Critical Current

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    • 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
    • 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
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • 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
    • B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/406—Ammonia
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001—Dry processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/02—Working-up flue dust
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processing Of Solid Wastes (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Treating Waste Gases (AREA)

Abstract

The present invention relates to a kind of method for decreasing the ammonia content adhered to the burning ash, it consists of burning the fuel under the condition of effectively forming burning fly-ash and collecting ash and exposing the ash to the air flow of at least 300 deg.F in temp. for at least 1 min.

Description

Ash ammonia scrubbing
The present invention relates to a kind of after the burning that fixed Combustion Source produces, disengage the floating dust or stripping adheres to ammonia (NH 3) method.
Reduction (NO along with oxynitride xX is an integer in the formula, be generally 1 or 2) appearance of Technology (oxynitride is a kind of pollutent that usually is present in the burning and gas-exhausting stream of big Industrial Boiler and other combustion equipment), as the by product that this Technology produced, contain ammonia in burning and gas-exhausting stream.Its major cause is owing to the NO that has adopted in nitrogen containing component (as ammonia or urea) and the evacuation circuit xReaction also reduces its content.This phenomenon usually is called as " ammonia slippage " or " ammonia penetrates ", it is believed that, this causes by introducing to surpass stoichiometric ammonia or generate ammonia in the oxynitride reduction process of ammonia or urea mediation.In addition, also can cause in evacuation circuit contain ammonia as the conditioning agent of evacuation circuit with the performance of improving electrostatic precipitator with ammonia.
When containing a large amount of ammonia in the burning effluent, a considerable amount of ammonia are caught with the grey branch that produces in the burned process of the form of ammonium salt, particularly ammonium sulfate, ammonium chloride and monoammonium sulfate and are absorbed with free ammonia.Usually these products are by absorbing or reaction and hold back in ash and be attached in the ash after the burning.In addition, a certain amount of these products of absorption also can take place on ash.
When being soaked after the combust, ammonium salt can decompose, and causes disengaging in atmosphere ammonia, and for example when ash content being piled up in the environment that does not add protection as external (common all be do) of open-air mine, grey branch is soaked by rainwater.In addition, when using described ash to assign to prepare concrete or other analogous composition, the alkalescence of these compositions (providing by the lime that adds or related substance usually) will cause that ammonia is separated out and bulk storage in atmosphere.No matter emitting of ammonia is which kind of reason causes in the combustion ash, it all is extremely undesirable, particularly when people when the adjacent domain of ash is worked, because ammonia is considered to a kind of pollutent of danger.
Thereby, no matter be to pile up processing or be used for other products such as concrete, all need a kind of method to eliminate or to reduce at least the release of ammonia in the combustion ash.
Some documents disclose with combustion ash and generate the available product, the preparation of a kind of Ru 2006101161 that contains coal ash is disclosed as the United States Patent (USP) 4,469,503 of Stockel, and a kind of water-insoluble polymkeric substance, it decomposes gradually and evenly is aggregated in nitrogen on the coal ash with slow release.Also have at United States Patent (USP) 4,659, Costopoulos and Newhouse point out to mix the preparation that forms similar concrete building material by floating dust with tackiness agent, air entrainment agent, water and whipping agent in 385.At United States Patent (USP) 4,088, in 804, Cornewell and Plunguian disclose in hydraulic cement composite with rigid (pozzolonic) floating dust with fixed attention and have prepared protective and decorative coating.
Utilize the oxynitride method of reducing of ammonia, urea or other nitrogenous composition still newer, therefore, the problem of distributing of ammonia is just noted by people as of late in the combustion ash, thus reduce this undesirable diffusion method open source literature seldom.
Epperly and Sprague be at United States Patent (USP) 5,069, discloses in 720 a kind ofly to be present in the stores as to reduce the method that ammonia distributes in the combustion ash in the open in the mine or in other exposed environment the time when ash content.The Epperly/Spregur method comprise to combust or with the physical barriers layer composition or with chemical barrier layer composition or two all in order to prevent that ammonia wherein is dispersed in the atmosphere.Obviously, this method is ammonia to be remained on do not provide a kind of means to eliminate ammonia and and then to utilize ash as in order to produce material of construction in the combustion ash.
Huller, Wirsching and Hamm be at European patent 0,135, discussed in 148 and eliminate ammonia or ammonium salt from combustion ash.This patent has been put down in writing a kind of method, comprises that the ash content (occupied in the catalyst nox reductive method and used ammonia treatment) that makes in the coal power station and calcium oxide (lime) or the oxide material of calcium and excessive water are mixed together.Ash reacts in reaction vessel with lime and reached 2 hours and condensation discharges from ash in condensing works ammonia.But the employed equipment of the method for this European patent is very expensive and very consuming time, and it also can reduce the rigid with fixed attention of ash.With regard to all waste materials of boiler being operated regularly generation, from economic aspect and satisfy the processing requirement aspect, this disclosed method all can not be satisfactory.
The present invention relates to a kind of method of removing ammonia in the burning floating dust, described ammonia is that the byproduct of the method for reducing of oxynitride adheres in the effluent that particularly burns as a kind of burning back flue gas treating process.This invention is usually included in effectively from ash content stripping or disengages under the condition of appended ammonia and makes the burning floating dust stand the effect of flowing air stream.
Floating dust be a kind of by stationary combustion source such as coal, oil or burning municipal solid waste (MSW) power station evacuation circuit or stack gas in the powdered material collected.Usually, it comprises the very thin dust of most of particle in the silt size range.The physics of floating dust is to change according to the different of Combustion Source with chemical property, and this depends on fuel source, burning and control method, before burning and material (for example nitrogenous NO that adds afterwards xThe reduction treatment agent) and the material that helps the floating dust collection process to be added.
The main component of floating dust is silicon oxide (silicon-dioxide SiO 2), general content between about 34% and about 55%, alumina (aluminium oxide Al 2O 3) usually content about 21%～about 30%, calcium oxide (CaO), general content is about 5%～27%, and magnesium oxide (MgO), its content general about 1.0%～about 5%.As everyone knows, the actual composition of floating dust can change in very wide scope, and in fact, the scope that is provided only is to represent the composition of general floating dust typically.Except above these compositions, the incendiary floating dust also contains other composition and unburned carbon usually.Several composition analyses that record by the floating dust of different sources the results are shown in the table I.
The table I
Floating dust 1 floating dust 2 floating dusts 3 floating dusts 4 floating dusts 5
SO 248.7 47.0 34.0 49.0 35.0
Al 2O 321.0 27.0 20.4 22.4 19.1
CaO 9.2 5.0 25.9 17.0 26.5
MgO 3.3 1.9 4.4 3.1 5.0
SO 38.8 - 2.3 0.4 1.7
Fe 2O 34.0 7.8 4.0 3.2 4.8
K 2O 2.0 3.2 0.2 0.1 0.1
TiO 20.7 1.1 - - -
Na 2O 0.3 0.8 2.3 0.2 0.7
P 2O 50.3 0.8 - - -
Moisture--0.0 0.3 0.0
Carbon--0.7 0.9 0.4
Table I (continuing)
Floating dust 6 floating dusts 7 floating dusts 8
SO 239.0 43.0 55.0
Al 2O 322.5 24.1 30.0
CaO 20.3 22.6 3.5
MgO 5.0 3.6 1.0
SO 31.0 1.0 0.3
Fe 2O 35.2 4.5 4.7
K 2O 0.2 - -
TiO 2- - -
Na 2O 0.5 - -
P 2O 5- - -
Moisture 0.1 0.0 0.0
Carbon 0.1 0.4 1.1
* all data are all approximately behind the radix point one and represent that with percentage ratio the measured value that does not provide is only represented not measure.The table I does not reflect whole compositions of measuring floating dust, and the special component of only reflection mensuration.
Generally, the proportion of floating dust is in 2.1～2.6 scopes, and most of particle of floating dust is glassy spheroid, but except the carbon particles, carbon particles is compared big slightly with inorganic particulate, and cerioid more.Floating dust particle average granularity is less than about 1.0 to about 80 micron diameters, and more common diameter is between 1.0～20.0 microns.
In stationary combustion source such as generating set or other similar system, produce combustion ash by coal combustion, oil, municipal solid waste or other material.The burned evacuation circuit of described ash content is carried secretly, and this air-flow often contains known pollutent oxynitride.Generating atomic oxygen and nitrogen and Chemical bond under the high-temperature atmosphere that produces in stationary combustion source becomes oxynitride, and they are pollutents of trouble and constitute a kind of main stimulator in the smog.In addition, NO xStanding a kind of process that photo-chemical smog forms that is called, is the important factor that forms acid rain, and relevant with the consumption of undesirable ozonosphere.Oxynitride also can make atmosphere heat up, and this is commonly referred to " Greenhouse effect ".
By introducing the content that nitrogenous treating agent can reduce oxynitride in the burning and gas-exhausting stream, described treatment agent or itself are reacted voluntarily or are promoted selective catalytic reduction process.Being used for the prevailing reagent of oxynitride non-catalytic reduction is urea and ammonia, can be according to some kinds of different methods of effective nitrogen oxides reduction and introduce them.The example of these methods is disclosed in the United States Patent (USP) 4,325,924 of the United States Patent (USP) 4,208,386 of United States Patent (USP) 3,900,544, Arand, Muzio and Sotter of Lyon and Arand, Muzio and Teixeira, and they are incorporated by reference in this article.
And introducing nitrogenous treating agent can be by nitrogen oxides reduction effectively but the mode that is the ammonia amount minimum that ammonia slippage or the ammonia state that penetrates produce is carried out.This mode by Epperly, Peter-Hoblyn, Shulof, Jr. and Sullivan at United States Patent (USP) 4,777,024, Epperly, Peter-Hoblyn, Shulof, Jr., Sullivan, Sprague and O ' Leary are in United States Patent (USP) 5,057,293; Epperly, O ' Leary and Sullivan are in United States Patent (USP) 4,780,289; And Epperly, Sullivan, Sprague and O ' Leary be at United States Patent (USP) 5,017, points out that above-mentioned disclosed document is incorporated by reference in this article in 347.
Recently, a kind of on-catalytic NO xThe application of reduction technique uniqueness, be to be that " with hydrolysis of urea product nitrogen oxides reduction " international publication number is to be on August 1st, 1991 the WO 92/02450(applying date at the international application exercise question with Von Harpe, Pachaly, Lin, Diep and Wegrzyn) in propose, wherein disclose a kind of method of utilizing hydrolysis of urea product nitrogen oxides reduction, above-mentioned file is incorporated by reference in this article.
The oxynitride catalytic reduction generally includes and makes evacuation circuit pass through catalyst bed under the condition that has ammonia to exist.Reductive NO xSelective catalytic reduction method be well-known and utilized various different catalysts, for example at european patent application WO 210, in 392, Eichholtz and Weiler have discussed with activated charcoal or activated charcoal, and add ammonia and catalyzer with catalytic removal of nitrogen oxides.People such as Kato are at United States Patent (USP) 4,138, in 469 and Henke at United States Patent (USP) 4,393, disclose with platinum metals and/or other metal such as titanium, copper, molybdenum, vanadium, tungsten or its oxide compound in 031 and added the ammonia Reduction of NO xTo realize desirable catalytic reduction.Another kind of catalytic reduction method be by Knight at Canadian Patent 1,100, disclosed in 292, wherein relate to and use platinum metals, gold and/or the silver-colored catalyzer that is deposited on the refractory oxide.People such as Mori are at United States Patent (USP) 4,107, have discussed in 272 with oxysulfide (oxysulfur), the vitriol or the sulfite compound of vanadium, chromium, manganese, iron, copper and mickel and add the ammonia Reduction of NO xIn addition, as Hofmann, Sun and Luftglass at United States Patent (USP) 4,978, in 514, Luftglass, Hofmann and Sun are at United States Patent (USP) 5,139, pointed in 754, provide (to small part) ammonia being used under the condition of effluent production ammonia, introducing urea, so that make NO in the upper reaches xCatalytic reduction, above-mentioned document is incorporated by reference here.
Regardless of by introducing the concrete grammar that nitrogenous treating agent comes nitrogen oxides reduction, in fact can not prevent at least some ammonia slippages.When it took place, ammonia just was attached in the floating dust, mainly by with its reaction and be absorbed in the floating dust.Usually, ammonia is present in the ash with ammonium salts, for example the free ammonia of ammonium chloride, ammonium sulfate and monoammonium sulfate and absorption.
In order to prevent that floating dust is diffused in the atmosphere, can pass through general equipment such as cloth bag dust suction chamber, electrostatic precipitator or similar device are collected it.Carry ash content then or handle as landfill or open-air mine and handle, or be utilized again as being used for the structure filling, or preparation cement or other material of construction.
As mentioned above, after the burning floating dust is collected,, can from ash, under the condition of the ammonia of the main quantity of stripping (as at least about 40%), make ash content stand the effect of fluidizing air effectively for the ammonia that from the burning floating dust, discharges or stripping adheres to.Though be described as fluidizing air here, it is understood to include dry air and contains water vapor and the air of steam.
Preferably, at the ammonia of stripping at least 65% effectively, more preferably therefrom make ash content stand the effect of fluidizing air under the condition of the ammonia of stripping at least 90%.For the ammonia of the main quantity of stripping from ash most effectively, air themperature should be about 300 °F at least, preferably is at least about 350 °F.Though air themperature does not have definite upper limit, if temperature is higher than about 650 °F, the efficient of stripping ammonia will can not increase significantly.
Should be noted that the air that will contact ash should be a mobile, fluidizing air must have enough speed and adhere to again avoiding so that remove deammoniation near ash content.For this purpose, the flow velocity of air most preferredly should be able to make ash fluidization.When air flowing is passed or during the about 5 feet flow velocitys of every square feet of grey per minute passing through, described fluidisation can be occurred.Flow rate depends on the thickness of ash content etc.If ash content in airflow be fluidizing or suspension the stripping of ammonia will take place.Ash content should be exposed to that time enough is with the fluidisation ash content in the airflow, and this depends on air themperature, and-temperature is high more, and exposure duration is just short more.
The exposure duration that meets the requirements is at least about 1 minute, preferably about 2 and about 10 minutes between with a large amount of ammonia of stripping from ash content.
When ash content is positioned at collecting device or can makes it stand the effect of airflow when conveying belt is carried.In a preferred embodiment of the invention, keep at utmost contact for making between ash content and the airflow, with airflow both from the surface current mistake of ash content, also by air is passed through ash content from following through the ash content bubbling.A kind of this destination device that reaches is called " air slide ", and it is a handling machinery of carrying ash content, passes through porous cloth incoming flow ashing branch with low-pressure air.Inclined transporter is to make the ash content input by gravity slightly.With air afterburning upwards by this cloth and by ash content with stripping ammonia therefrom.After being exposed to ash content in the hot blast, carry ash content to handle or utilization again as mentioned above then.
It is relevant that the temperature of fluidizing air is exposed to the airborne time with ash content, when air is in low temperature, needs to expose for a long time, and when requiring exposure duration in short-term, then needs high air themperature.As, in ash content is stored in bunker, being fit to long exposure duration, air themperature only must be between about 300 °F and about 400 °F, the temperature although some ash contents are had relatively high expectations (at least about 600) had both made long exposure duration.Yet when ash stream was carried on air slide, exposure duration was defined as about 1 to about 3 minutes, and air themperature should be between about 450 °F and about 650 °F.
Usually, carry the burning floating dust by forming mortar in water or in other liquid.Do although it is so and help carrying floating dust but for the ammonia in the stripping ash content effectively, when ash content was exposed in the flowing air stream, importantly it should be exsiccant basically, that is to say, it is about 7% that its humidity is not more than, and better is not more than approximately 3%, better is not more than 0.5%.
In addition, though ash content generally is alkaline (the pH value changes between about 5.0 and about 8.5 usually), the basicity (promptly improving pH) that improves ash content helps the ammonia stripping.Improve basicity ammonia will be separated out, carry ammonia by fluidizing air and leave.Improve basicity can by in ash content, add alkaline reagents for example lime finish, reach measured value arbitrarily but its amount will be enough to improve the basicity of ash content.Yet the basicity that improves ash may be disadvantageous, and this depends on the last use of ash content.For example, the high alkalinity ash content is not suitable for being used for some material of construction.
Be loaded with the air of ammonia, can have handled by universal method, to remove ammonia wherein, on the other hand, warm air can be used as the combustion air circulation to reclaim heat and the ammonia that burns.
With reference to the following examples explanation, use the ammonia amount of adhering in the floating dust after the present invention can significantly reduce burning.
Embodiment
One pilot scale air-lift device is provided here, and it has one can regulate the warm air supply pipe, by 4 inches carbon steel pipe manufacturings that approximately are five feet long.Along supply pipe length ,-1 inch slip-stream switch and 2 thermowell are installed monitoring air fed temperature and in hot blast, to introduce polluted ash content, heated air source is the space heater of self-contained 30,000 British thermal units (btu).The downstream of the glide path of supply pipe, the collecting chamber that uses a band filter bag is to collect the ash content of having handled.The collecting chamber downstream is a mobile control baffle plate and an outlet air temperature meter.
Contain ammonia concentration and be the 272 parts/burning floating dust (500 gram) of per 1,000,000 parts (ppm), be introduced in the hot blast in the pilot scale steam stripping unit that is in all temps and reach 2 minutes, in strainer, collect then, measure last ammonia concentration.The results are shown in the table II.
The table II
Temperature (°F) time (branch) original NH 3(ppm) last NH 3(ppm) reduce %
450 2 272 5 98.2
450 2 272 0 100
300 2 272 0 100
Observe present embodiment, illustrate that clearly implementing stripping effectively by the inventive method is attached to ammonia in the burning floating dust in a large number.
Above-mentioned illustrative purposes is in order to instruct one of skill in the art how to implement the present invention, but can not describing in detail, it whole after reading above-mentioned explanation, can carry out conspicuous improvement and variation to it for the professional, yet all these conspicuous improvement and variation all are included within the scope of the present invention that is limited by following claim.

Claims (19)

1, a kind of minimizing is attached to the method for the ammonia amount of burning in the floating dust, be included under the condition that can effectively form the burning floating dust combustion fuel and collect described ash content, and expose described ash content at least about in 300 the airflow at least about 1 minute.
2, the process of claim 1 wherein that described air themperature is at least about 350 °F.
3, the method for claim 2, wherein said air themperature are not higher than about 650 °F.
4, the process of claim 1 wherein that described ash content was exposed in the described airflow at least about 2 minutes.
5, the process of claim 1 wherein that the velocity of flow of described air will be enough to the described ash content of fluidisation effectively.
6, the process of claim 1 wherein that the humidity of described ash content is not more than about 7%.
7, the process of claim 1 wherein that described fuel comprises coal, oil or municipal solid waste.
8, the process of claim 1 wherein that the pH of described ash content improves by adding alkaline reagents.
9, the process of claim 1 wherein that described air contains steam.
10, a kind of method that reduces the amount of the ammonia that adheres in the burning floating dust comprises:
ⅰ. combustion fuel under the condition that effectively forms the burning and gas-exhausting stream that contains floating dust and oxynitride;
ⅱ. by handling described evacuation circuit in the described evacuation circuit to reduce the concentration of oxynitride wherein ammonia being attached under the condition for validity of described floating dust nitrogenous treating agent introduced;
ⅲ. collect described floating dust; With
ⅳ. expose in described floating dust is at least about 300 to temperature the airflow at least 1 minute, wherein said airflow stripping goes out the ammonia that contains in described floating dust.
11, the method for claim 10, wherein said fuel comprise coal, oil or municipal solid waste material.
12, the method for claim 10, wherein said nitrogenous treating agent comprise hydrolysate or its mixture of urea, ammonia, urea.
13, the method for claim 10, wherein said air themperature are at least 350 °F.
14, the method for claim 13, wherein said air themperature are not higher than 650 °F.
15, the method for claim 10, wherein said ash content were exposed in the described airflow at least about 2 minutes.
16, the method for claim 15, wherein said speed air flow will be enough to the described ash content of fluidisation effectively.
17, the method for claim 10, the humidity of wherein said ash content is not more than 7%.
18, the method for claim 10, the pH of wherein said ash content can improve by adding alkaline reagents.
19, the method for claim 10, wherein said air contains steam.
CN94106272A 1992-10-08 1994-04-25 Ash ammonia scrubbing Pending CN1113883A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/US1993/009603 WO1994008892A1 (en) 1992-10-08 1993-10-07 Ash ammonia stripping
CN94106272A CN1113883A (en) 1992-10-08 1994-04-25 Ash ammonia scrubbing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US95856392A 1992-10-08 1992-10-08
CN94106272A CN1113883A (en) 1992-10-08 1994-04-25 Ash ammonia scrubbing

Publications (1)

Publication Number Publication Date
CN1113883A true CN1113883A (en) 1995-12-27

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WO (1) WO1994008892A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6290066B1 (en) * 1998-03-26 2001-09-18 Board Of Control For Michigan Technological University Method for removal of ammonia from fly ash
US6755901B1 (en) 1999-08-17 2004-06-29 Wisconsin Electric Power Company Ammonia removal from fly ash
US7217401B2 (en) 1999-08-17 2007-05-15 Wisconsin Electric Power Company Mercury removal from activated carbon and/or fly ash
CN112591766A (en) * 2020-11-18 2021-04-02 苏州西热节能环保技术有限公司 Device and method for removing and utilizing ammonia in ash of coal-fired power plant

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2606863A (en) * 1945-05-14 1952-08-12 Shell Dev Process and apparatus for the conversion of hydrocarbons and the stripping of vaporizable hydrocarbons from the fouled catalyst
US4325924A (en) * 1977-10-25 1982-04-20 Electric Power Research Institute, Inc. Urea reduction of NOx in fuel rich combustion effluents
DK158841C (en) * 1984-01-09 1991-07-22 Superfos Dammann Luxol PROCEDURE FOR APPLYING ON A ROAD ROAD OF A POINT MARKING AND APPARATUS FOR CARRYING OUT THE PROCEDURE
DE3732560A1 (en) * 1987-09-26 1989-04-06 Babcock Anlagen Ag METHOD FOR SEPARATING AMMONIA REMAINS FROM FLIGHT ASH
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

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