EP0169305A2 - Procédé pour la purification de gaz d'installations de pyrolyse de déchets - Google Patents

Procédé pour la purification de gaz d'installations de pyrolyse de déchets Download PDF

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Publication number
EP0169305A2
EP0169305A2 EP85103522A EP85103522A EP0169305A2 EP 0169305 A2 EP0169305 A2 EP 0169305A2 EP 85103522 A EP85103522 A EP 85103522A EP 85103522 A EP85103522 A EP 85103522A EP 0169305 A2 EP0169305 A2 EP 0169305A2
Authority
EP
European Patent Office
Prior art keywords
washing
gas
stage
water
washing stage
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.)
Ceased
Application number
EP85103522A
Other languages
German (de)
English (en)
Other versions
EP0169305A3 (fr
Inventor
Gebhard Dr. Bandel
Guido Engelke
Dirk Dr. Hankel
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.)
KRAFTWERK UNION-UMWELTTECHNIK GMBH
Original Assignee
Kraftwerk Union-Umwelttechnik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kraftwerk Union-Umwelttechnik GmbH filed Critical Kraftwerk Union-Umwelttechnik GmbH
Publication of EP0169305A2 publication Critical patent/EP0169305A2/fr
Publication of EP0169305A3 publication Critical patent/EP0169305A3/fr
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
    • C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids

Definitions

  • the invention relates to a method for cleaning gases containing combustible components from the pyrolysis of waste materials.
  • One method is that carbonization of the waste materials at temperatures of approximately 300 to 800 ° C. produces carbonization gases and a solid carbonization residue.
  • the carbonization gases are then cracked at higher temperatures of around 850 to 1200 ° C.
  • the cracked gases also contain toxic components such as NH 3 , HCN, H 2 S and COS in quantities that depend on the type of waste used.
  • the cracked gases must be freed from these components before they are burned. This happens in gas scrubbers.
  • Such methods are described for example in DE-PS 24 32 504, DE-OS 29 27 240, DE-AS 26 51 302, DE-AS 26 4 041, DE-OS 30 49 259, DE-OS 32 17 030.
  • the gas scrubbing is carried out by recycling with wash water containing Ca (OH) 2 .
  • wash water containing Ca (OH) 2 Only a few percent of the NH 3 and less than half of the H 2 S uno HCN are removed.
  • the object of the invention is to largely remove the toxic constituents from these gases and to convert them into forms which can be readily removed from the wash water.
  • the cooled raw gas 1 contains different contents of partially toxic components depending on the composition of the waste materials. For example, 1500 to 5000 mg NH 3 / NM 3 (based on dry gas), 200 to 1600 mg HCN / Nm 3 , 300 Lis 500 mg H 2 S / Nm 3 and 40 to 100 mg COS / N m 3 are included, which are particularly harmful and therefore must be largely removed.
  • water 3 and formalin 4 are injected and sprayed into the gas stream 1 in finely divided form.
  • the formalin is used, for example, in a concentration of about 37% by weight.
  • the HCN content of gas 1 is converted very quickly and largely to glyconitrile.
  • the NH 3 content is converted more slowly to hexamethylenetetramine.
  • the amount of formalin used is such that, in addition to the conversion of the HCN, at least the majority of the NH 3 is also converted.
  • water 7, alkali 8 and H 2 0 2 9 are injected or injected into the gas stream in finely divided form.
  • the amounts of lye and H 2 O 2 added are such that a pH of 8.5 to 9.5 is established in the scrubber 6 and the sulfur components H 2 S and COS contained in the gas 5 are largely dissolved and essentially closed Elemental sulfur are oxidized. In this pH range, a very good conversion is achieved with a relatively low consumption of reagents. Possibly. Traces of formaldehyde entering the second washing stage 6 with the gas 5 are eliminated by the H 2 O 2 .
  • the washing stages 2, 6 are advantageously operated with a circulation of the separated washing liquid 11, 12, an amount being withdrawn from the circuit which corresponds to the newly obtained amount of liquid.
  • the washing stages 2, 6 kc can be designed in one or more stages. The one drawn from the circuits of the first and second washing stages Washing liquid is passed into a cleaning system 11, in which the suspended substances are first removed and then the dissolved or chemically bound pollutants are converted into harmless compounds.
  • Ca (OH) 2 solution or lime milk is added, the Ca sulfate formed is removed with the suspended substances.
  • a preferred embodiment consists in that the pH is adjusted to 8.9 to 9.1 according to (d). Within this range, a particularly good implementation is achieved with a relatively low consumption of reagents.
  • a preferred embodiment consists of the washing liquid being circulated in (a) and (c).
  • a very good utilization of the reagents is achieved by the circulation, the content of reaction products in the washing liquid is increased and the amount of washing liquids led into the cleaning 11 is reduced.
  • the length L M of the washing water 3 in the circuit of the first washing stage 2 is either kept constant by the quantity of the condensed humidity of the gas or by addition of fresh water.
  • the liquid flowing out of the first washing stage is expediently passed into separators 12, in which the washed-out dust and condensed tars separate out.
  • the solution is pumped into the circuit and the sludge fraction 13 is passed into the water purification 11.
  • the amount of washing water in the circuit of the second washing stage is kept constant by adding water continuously or discontinuously.
  • a preferred embodiment is that the suspended conversion from the washing liquid according to (f) tion products 13 are separated, the remaining solution is treated with H 2 0 2 and lye in a first treatment stage 1 4, then treated in a second treatment stage 15 with further H 2 0 2 and heated to a maximum of 70 ° C. above 16 and then neutralized .
  • the suspended solids are separated off in a known manner, for example by flocculation, separation and filtration. NaOH solutions or Ca (OH) 2 solutions or lime milk or mixtures of these substances are used as lye. When Ca (OH) 2 solution or milk of lime is added, the poorly soluble Ca salt of glycolic acid precipitates.
  • the major part of the glyconitrile is converted to glycolic acid, the sulfur compounds to sulfate or elemental sulfur and the formaldehyde to Na or Ca formate by the H 2 0 2 .
  • the pH value is increased by the addition of lye and the reaction is improved by increasing the hydrolysis and oxidation potential.
  • the reaction is improved by increasing the hydrolysis and oxidation potential.
  • the conversion is optimized in the second treatment stage 15, so that no excess of H 2 O 2 has to be added in the first treatment stage 14.
  • the reaction is accelerated by the temperature increase in the second treatment stage. However, an increase above 70 ° C has a negative effect.
  • the neutralization 17 is generally carried out using sulfuric acid 18. After filtration, the solution of organic constituents contains only biodegradable compounds.
  • the advantages of the invention are that the cracked carbonization gases 1 are largely freed of harmful components, the washing water 3, 7 can also be largely freed of non-degradable components and the consumption of chemicals can be kept relatively low.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Treating Waste Gases (AREA)
  • Processing Of Solid Wastes (AREA)
EP85103522A 1984-04-04 1985-03-25 Procédé pour la purification de gaz d'installations de pyrolyse de déchets Ceased EP0169305A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843412581 DE3412581A1 (de) 1984-04-04 1984-04-04 Verfahren zur reinigung von gasen aus pyrolyseanlagen von abfallstoffen
DE3412581 1984-04-04

Publications (2)

Publication Number Publication Date
EP0169305A2 true EP0169305A2 (fr) 1986-01-29
EP0169305A3 EP0169305A3 (fr) 1988-03-23

Family

ID=6232606

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85103522A Ceased EP0169305A3 (fr) 1984-04-04 1985-03-25 Procédé pour la purification de gaz d'installations de pyrolyse de déchets

Country Status (4)

Country Link
EP (1) EP0169305A3 (fr)
DE (1) DE3412581A1 (fr)
FI (1) FI77259C (fr)
IL (1) IL74798A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0223904A2 (fr) * 1985-09-28 1987-06-03 Degussa Aktiengesellschaft Procédé pour nettoyer un gaz industriel ou un gaz de combustion
EP0514673A1 (fr) * 1991-05-23 1992-11-25 Degussa Aktiengesellschaft Procédé pour la séparation d'acide cyanhydrique des gaz et des gaz d'échappement

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2740355B1 (fr) * 1995-10-27 1998-01-16 Cos Ingenierie Procede de depollution ammoniacale d'effluents liquides ou gazeux
ATE230789T1 (de) * 1996-10-29 2003-01-15 Thermoselect Ag Verfahren zur vollständigen stofflichen, emissionslosen nutzung durch hochtemperatur- recycling und durch fraktionierte stofflich spezifische konvertierung des entstehenden synthese-rohgases
DE102008018698A1 (de) 2008-04-09 2009-10-22 Durtec Gmbh Neue mineralische Gasadsorber für Biogasanlagen
DE102011010525A1 (de) 2011-02-08 2012-08-09 Universität Rostock Verfahren zur Reinigung von Biogas, Rauchgas oder Flüssigkeiten, Adsorbens dafür, Filter, sowie Verwendung des Adsorptionsmittels

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE412113C (de) * 1922-03-03 1925-04-15 Hermann Rathert Dr Verfahren zur Vernichtung von Schwefelkohlenstoff in Abgasen
US2859090A (en) * 1955-02-07 1958-11-04 Exxon Research Engineering Co Treatment of fluids for removal of hydrogen cyanide
FR2267984A1 (fr) * 1974-04-22 1975-11-14 Degussa

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE412113C (de) * 1922-03-03 1925-04-15 Hermann Rathert Dr Verfahren zur Vernichtung von Schwefelkohlenstoff in Abgasen
US2859090A (en) * 1955-02-07 1958-11-04 Exxon Research Engineering Co Treatment of fluids for removal of hydrogen cyanide
FR2267984A1 (fr) * 1974-04-22 1975-11-14 Degussa

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHEMISTRY AND INDUSTRY, Nr. 14, Juli 1983, Seiten 555-558, London, GB; A.F.E. SIMS: "Industrial effluent treatment with hydrogen peroxide" *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0223904A2 (fr) * 1985-09-28 1987-06-03 Degussa Aktiengesellschaft Procédé pour nettoyer un gaz industriel ou un gaz de combustion
EP0223904A3 (en) * 1985-09-28 1988-04-13 Degussa Aktiengesellschaft Process for purifying an industrial or a flue gas
EP0514673A1 (fr) * 1991-05-23 1992-11-25 Degussa Aktiengesellschaft Procédé pour la séparation d'acide cyanhydrique des gaz et des gaz d'échappement
US5200161A (en) * 1991-05-23 1993-04-06 Degussa Aktiengesellschaft Process for the separation of hydrogen cyanide from gases and waste gases

Also Published As

Publication number Publication date
FI850678L (fi) 1985-10-05
FI77259B (fi) 1988-10-31
EP0169305A3 (fr) 1988-03-23
FI77259C (fi) 1989-02-10
IL74798A0 (en) 1985-07-31
FI850678A0 (fi) 1985-02-19
DE3412581A1 (de) 1985-10-24
IL74798A (en) 1988-09-30

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