DE3637518A1 - Process for separating off acidic constituents downstream of fossil fuel plants - Google Patents

Process for separating off acidic constituents downstream of fossil fuel plants

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Publication number
DE3637518A1
DE3637518A1 DE19863637518 DE3637518A DE3637518A1 DE 3637518 A1 DE3637518 A1 DE 3637518A1 DE 19863637518 DE19863637518 DE 19863637518 DE 3637518 A DE3637518 A DE 3637518A DE 3637518 A1 DE3637518 A1 DE 3637518A1
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DE
Germany
Prior art keywords
cyclone
lime
filter
station
acidic constituents
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Withdrawn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
DE19863637518
Other languages
German (de)
Inventor
Heinz Dipl Ing Hoelter
Heinrich Dipl Ing Igelbuescher
Heinrich Ing Grad Gresch
Heribert Dipl Ing Dewert
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to DE19863637518 priority Critical patent/DE3637518A1/en
Publication of DE3637518A1 publication Critical patent/DE3637518A1/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Withdrawn legal-status Critical Current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
    • B01D53/68—Halogens or halogen compounds
    • 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
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/508—Sulfur oxides by treating the gases with solids

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

Abstract

It is known that in combustion boilers which bear acidic constituents in the flue gas, these are bound by blowing in lime substances. However, the degree of binding is far below 30% and thus in no way corresponds to the values demanded. In order to eliminate this disadvantage and to separate off the acidic constituents, in particular SO2, eg. at 90@, from the crude gas stream, according to the invention it is proposed that the loaded dust-containing crude gas stream from a coal boiler is predominantly separated from the ash via a cyclone (1) and an additive, preferably hydrated lime, is fed downstream of the cyclone station to a contacting section (8) which opens out into a chemisorption filter (3), the used lime from the filter (3) being collected in a silo (5) and fed again to the cyclone station, and the cyclone station being designed in such a way that the vortex chamber of the cyclone (1) contacts the as yet unreacted fine dust, eg. hydrated lime, with the crude gas, and thus forced multiple contacting with circulated used lime for SO2 binding is imposed upon the contact section (2) and the chemisorption filter (3). <IMAGE>

Description

Es ist bekannt, daß in Kesseln, die saure Bestandteile im Rauchgas führen, diese durch Einblasen von Kalk­ substanzen gebunden werden. Es ist bekannt, daß der Einbindegrad weit unter 30% liegt. Weiterhin ist bekannt, hinter Kesselanlagen Sprühtrockner oder trockenarbeitende Filter zu schalten, die im Filter selbst oder im Sprühtrockner mit angefeuchteten alka­ lischen Massen SO2, HCl und HF einbinden.It is known that in boilers that contain acidic components in the flue gas, these are bound by blowing lime substances. It is known that the degree of integration is well below 30%. It is also known to switch spray dryers or dry-working filters behind boiler systems, which incorporate SO 2 , HCl and HF in the filter itself or in the spray dryer with moistened alkali masses.

Es ist weiterhin bekannt, alkalische Absorptionsmassen über Kontaktstrecken zur Abbindung von z. B. SO2 einzu­ blasen.It is also known to use alkaline absorption masses via contact lines for setting z. B. SO 2 blow.

Alle diese erwähnten Verfahren haben nicht den ge­ wünschten Wirkungsgrad gebracht, der erforderlich ist, z. B. um 90% SO2 aus dem Rohgasstrom abzuscheiden.All of these mentioned methods have not brought the desired efficiency that is required, e.g. B. to separate 90% SO 2 from the raw gas stream.

Erfindungsgemäß wird daher vorgeschlagen, ein Ver­ fahren zu wählen, das wie folgt mehrstufig arbeitet.According to the invention it is therefore proposed a Ver drive to choose, which works in several stages as follows.

In der Zeichnung ist das Verfahren erläutert.In the drawing is the procedure explained.

Mit (1) ist der Zyklonabscheider dargestellt, der so ausgebildet ist, daß er Flugstaub abscheidet und die Kalkhydratmasse durch das Tauchrohr durchläßt, um es in der nachgeschalteten Kontaktstrecke (2) erneut wirksam werden zu lassen. Im nachgeschalteten Filter (3) wird der eingeblasene Aktivstaub weiterhin zur Nutzung der Einbindung von sauren Bestandteilen ge­ nutzt.With ( 1 ) the cyclone separator is shown, which is designed so that it separates flying dust and the hydrated lime mass passes through the immersion tube to make it effective again in the downstream contact section ( 2 ). In the downstream filter ( 3 ), the blown-in active dust continues to be used to incorporate acidic components.

In die Kontaktstrecke (2) wird frisches z. B. Ca(OH)2 über ein Silo (4) der Kontaktstrecke zugegeben, und am Ende des Filters bei (5) ist ein Silo aufgestellt, in dem der Altkalk, der teilreagiert ist, aufgefangen wird. In the contact path ( 2 ) fresh z. B. Ca (OH) 2 via a silo ( 4 ) of the contact section, and at the end of the filter at ( 5 ) a silo is set up, in which the old lime, which is partially reacted, is collected.

Über ein pneumatisches Fördersystem wird der teilreagierte und noch nicht letztlich verbrauchte Kalk der Zyklon­ gruppe zugeführt, wobei die Zyklongruppe, wie oben erwähnt, erfindungsgemäß so ausgeführt ist, daß die Asche abgeschieden wird und der Feinkalk über die Tauch­ rohre erneut wiederum den Kreisweg über Kontaktstrecke (2) und Filter (3) geht.The partially reacted and not yet finally used lime is fed to the cyclone group via a pneumatic conveying system, whereby the cyclone group, as mentioned above, is designed according to the invention in such a way that the ash is separated off and the fine lime via the immersion pipes again circulates the contact path ( 2 ) and filter ( 3 ).

Das Zwischensilo (5) ist für eine größere Verweilzeit des teilreagierten Kalkes ausgelegt. Man hat heraus­ gefunden, daß die an der Oberfläche des Kalkes ange­ lagerten Ca-Verbindungen in den Kern des Kalkteilchens hinein diffundieren und somit die Oberfläche reaktiviert wird, um stärkere SO2-Aufnahme herbeizuführen.The intermediate silo ( 5 ) is designed for a longer residence time of the partially reacted lime. It has been found that the calcium compounds deposited on the surface of the lime diffuse into the core of the lime particle and thus the surface is reactivated in order to bring about greater SO 2 uptake.

Der Feinstaub wird insbesondere in der Wirbelsenke des Zyklons praktisch wieder über das Tauchrohr mit dem Rohgas kontaktiert.The particulate matter is particularly in the spine of the Cyclones practically again with the dip tube Raw gas contacted.

Weiterhin wird erfindungsgemäß vorgeschlagen, zur Ver­ besserung der Reaktion eine Teilkonditionierung inner­ halb des Kessels - Wärmetauschbereich - durchzuführen, um die notwendige Feuchte dem Rauchgas zuzuführen, um die Rauchgastemperatur abzusenken.Furthermore, it is proposed according to the invention for ver improvement of the reaction a partial conditioning inside half of the boiler - heat exchange area -  to supply the necessary moisture to the flue gas, to lower the flue gas temperature.

Claims (1)

. Verfahren zum Abscheiden von sauren Bestandteilen, vorzugsweise SO2 hinter fossilen Brennstoffanlagen, dadurch gekennzeichnet, daß der aus einem Kohle­ kessel beladene, staubhaltige Rohgasstrom über ein Zyklon überwiegend von der Asche getrennt wird und ein Additiv, vorzugsweise Kalkhydrat, hinter der Zyklonstation einer Kontaktstrecke zugeführt wird, die in einem Chemisorptionsfilter (3) mündet, wobei der Altkalk aus dem Filter (3) im Silo (5) gesammelt, wiederum der Zyklonstation zugeführt wird, und die Zyklonstation so ausgebildet ist, daß die Wirbel­ senke des Zyklons den noch nicht reagierten feinen Staub, z. B. Kalkhydrat, mit dem Rohgas kontaktiert, und somit der Kontaktstrecke (2) und dem Chemi­ sorptionsfilter (3) ein im Kreislauf geführter Altkalk eine zwangsläufige Mehrfachkontaktierung zur SO2- Bindung aufgezwungen wird.. Process for separating acidic constituents, preferably SO 2, behind fossil fuel systems, characterized in that the dust-containing raw gas stream loaded from a coal boiler is predominantly separated from the ashes by a cyclone and an additive, preferably hydrated lime, is fed to a contact path behind the cyclone station which opens into a chemical sorption filter (3), wherein the Altkalk from the filter (3) in the silo collected (5), turn the cyclone station is supplied, and the cyclone station is designed so that the swirl valley of the cyclone to the not yet reacted fine Dust, e.g. B. hydrated lime, contacted with the raw gas, and thus the contact section ( 2 ) and the chemi sorption filter ( 3 ) a recycled old lime is forced an inevitable multiple contact for SO 2 binding.
DE19863637518 1986-11-04 1986-11-04 Process for separating off acidic constituents downstream of fossil fuel plants Withdrawn DE3637518A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19863637518 DE3637518A1 (en) 1986-11-04 1986-11-04 Process for separating off acidic constituents downstream of fossil fuel plants

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19863637518 DE3637518A1 (en) 1986-11-04 1986-11-04 Process for separating off acidic constituents downstream of fossil fuel plants

Publications (1)

Publication Number Publication Date
DE3637518A1 true DE3637518A1 (en) 1988-05-05

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ID=6313124

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19863637518 Withdrawn DE3637518A1 (en) 1986-11-04 1986-11-04 Process for separating off acidic constituents downstream of fossil fuel plants

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Country Link
DE (1) DE3637518A1 (en)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1119432A (en) * 1965-01-30 1968-07-10 Mitsubishi Heavy Ind Ltd Gas-powder contact process and apparatus therefor
DE2225686A1 (en) * 1971-05-28 1972-12-14 Tam Process and device for the adsorption of fluorine and fluorine compounds on aluminum oxide
DE2437750A1 (en) * 1974-08-06 1976-02-26 Huenlich Hans Werner Dipl Ing Single or multistage gas-solid contacting - by solids injection into cyclone for pollutant removal from exhaust gases
DE2520045A1 (en) * 1975-05-06 1976-11-25 Heinz Hoelter Gas purificn. by addn. of absorbent - in series of stages with sepn. and recycling of absorbent after each stage
DE2645026A1 (en) * 1976-10-06 1978-04-13 Steag Ag PROCESS AND SYSTEM FOR PROCESSING SMOKE GASES, E. THE SMOKE GASES FROM POWER PLANTS, FIRED WITH FOSSIL FUELS, IN PARTICULAR WITH TON COAL
DE3107226A1 (en) * 1981-02-26 1982-09-02 Azo-Maschinenfabrik Adolf Zimmermann Gmbh, 6960 Osterburken DEVICE FOR SEPARATING FLOATING SUBSTANCES LIKE ASHES OR THE LIKE FROM SMOKE GASES
DE3242651A1 (en) * 1981-11-19 1983-05-26 Shell Internationale Research Maatschappij B.V., 2596 Den Haag Process for the separation of dry fly ash from a gas
DE3146465A1 (en) * 1981-04-23 1983-06-01 Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck Dry flue gas desulphurisation with upstream partial dust precipitation
DE3244075A1 (en) * 1981-12-01 1983-07-28 Shell Internationale Research Maatschappij B.V., 2596 Den Haag Process for purifying and cooling a hot gas and apparatus for carrying out the process
DE3438267A1 (en) * 1984-10-18 1986-06-12 Air System Barlage Vertriebs GmbH, 4593 Emstek Apparatus for neutralising and separating out pollutants in flue gases
DE3510669A1 (en) * 1985-03-23 1986-09-25 Walter 2848 Vechta Kärcher Apparatus for eliminating pollutants from flue gas streams and process for operating the apparatus

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1119432A (en) * 1965-01-30 1968-07-10 Mitsubishi Heavy Ind Ltd Gas-powder contact process and apparatus therefor
DE2225686A1 (en) * 1971-05-28 1972-12-14 Tam Process and device for the adsorption of fluorine and fluorine compounds on aluminum oxide
DE2437750A1 (en) * 1974-08-06 1976-02-26 Huenlich Hans Werner Dipl Ing Single or multistage gas-solid contacting - by solids injection into cyclone for pollutant removal from exhaust gases
DE2520045A1 (en) * 1975-05-06 1976-11-25 Heinz Hoelter Gas purificn. by addn. of absorbent - in series of stages with sepn. and recycling of absorbent after each stage
DE2645026A1 (en) * 1976-10-06 1978-04-13 Steag Ag PROCESS AND SYSTEM FOR PROCESSING SMOKE GASES, E. THE SMOKE GASES FROM POWER PLANTS, FIRED WITH FOSSIL FUELS, IN PARTICULAR WITH TON COAL
DE3107226A1 (en) * 1981-02-26 1982-09-02 Azo-Maschinenfabrik Adolf Zimmermann Gmbh, 6960 Osterburken DEVICE FOR SEPARATING FLOATING SUBSTANCES LIKE ASHES OR THE LIKE FROM SMOKE GASES
DE3146465A1 (en) * 1981-04-23 1983-06-01 Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck Dry flue gas desulphurisation with upstream partial dust precipitation
DE3242651A1 (en) * 1981-11-19 1983-05-26 Shell Internationale Research Maatschappij B.V., 2596 Den Haag Process for the separation of dry fly ash from a gas
DE3244075A1 (en) * 1981-12-01 1983-07-28 Shell Internationale Research Maatschappij B.V., 2596 Den Haag Process for purifying and cooling a hot gas and apparatus for carrying out the process
DE3438267A1 (en) * 1984-10-18 1986-06-12 Air System Barlage Vertriebs GmbH, 4593 Emstek Apparatus for neutralising and separating out pollutants in flue gases
DE3510669A1 (en) * 1985-03-23 1986-09-25 Walter 2848 Vechta Kärcher Apparatus for eliminating pollutants from flue gas streams and process for operating the apparatus

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