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WO1980000797A1 - Procede et installation pour depoussierer et absorber les gaz nocifs d'installations d'incineration et de fours a air chaud - Google Patents

Procede et installation pour depoussierer et absorber les gaz nocifs d'installations d'incineration et de fours a air chaud Download PDF

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Publication number
WO1980000797A1
WO1980000797A1 PCT/DE1979/000128 DE7900128W WO8000797A1 WO 1980000797 A1 WO1980000797 A1 WO 1980000797A1 DE 7900128 W DE7900128 W DE 7900128W WO 8000797 A1 WO8000797 A1 WO 8000797A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
washing liquid
sludge
dust
fresh water
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
PCT/DE1979/000128
Other languages
German (de)
English (en)
Inventor
L Leisegang
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.)
LEISEGANG UMWELTTECHN KG
LEISEGANG UMWELTTECH
Original Assignee
LEISEGANG UMWELTTECHN KG
LEISEGANG UMWELTTECH
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
Priority claimed from DE19782846457 external-priority patent/DE2846457C2/de
Priority claimed from DE19792929974 external-priority patent/DE2929974A1/de
Application filed by LEISEGANG UMWELTTECHN KG, LEISEGANG UMWELTTECH filed Critical LEISEGANG UMWELTTECHN KG
Publication of WO1980000797A1 publication Critical patent/WO1980000797A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B1/18—Arrangements of dust collectors

Definitions

  • the invention relates to a method for dedusting and harmful gas absorption, in particular absorption of hydrogen halide from exhaust gases. From waste incineration plants.
  • the cleaning of the exhaust gases from incineration plants with hydrogen halide emissions is usually carried out dry for the suspended matter, i.e. hot electrostatic filters or hot tissue filters are used for this.
  • gas is saturated and scrubbed with dilute acid, the concentration of which is regulated by the addition of fresh water. This determines the final purity of the exhaust gases.
  • the SOp also contained in the exhaust gas is generally not yet absorbed today, but remains in the exhaust gas.
  • the acid solution that arises during the absorption of hydrogen halide is neutralized separately and a hot neutral salt solution is produced as waste, which leads to very considerable wastewater problems, since it increases the salt load of the receiving waters (if discharge is made).
  • the object of the invention is to provide a method and a system for dedusting and purifying exhaust gas, for example top gas, wherein hydrogen halides and, if appropriate, additional SO 2 are to be removed from the exhaust gas.
  • the top gas emerging from the cupola furnace first arrives in a presaturator 1, where it is dedusted and, in the melting phase, is also cooled by evaporating fresh water.
  • the top gas is then fed to a dryer / cooler / pre-absorber 2.
  • the neutralizing agent and sludge from the circulating wash water contained in the subsequent washing stages are finely distributed, as a result of which fluorides and SO 2 are pre-separated, the blast furnace gas is further cooled and, on the other hand, the sludge is dried so that it is drier Waste sludge are removed can.
  • the thus cooled and partially cleaned blast furnace gas is fed to a cyclone group 3 and freed from the dust and the reaction products.
  • a universal Venturi scrubber 4 In the first stage of the washing process, the blast furnace gas is cooled with fresh water to the saturation point and washed. In the subsequent venturi washing process of the second stage of the scrubber, the top gas is washed with the separation of the residual dust and the alkaline washing of the remaining constituents of fluorides, hydrogen fluoride and SO 2 . The cleaned top gas is then available for further use in the extractor of the scrubber 4 I. For example, it can be used for combustion in the recuperator.
  • a limescale milk generator is assigned to the scrubber 4, ie CaCO 3 passes from a limestone silo 5 into a mixer and from there as limestone milk into an oxidation basin 7.
  • the washing liquid from the scrubber 4 is also introduced into this oxidation basin and the neutralization of the Wash water. Furthermore, the liquid in the oxidation basin is aerated for the conversion of CaCO 3 to CaCO 4 . Furthermore, a flocculant is added in this basin 7. The sludge water drawn off is fed to the dryer / cooler / pre-absorber 2 for injection. Clarified washing liquid is drawn off in the overflow of the basin 7 and is fed back to the scrubber 4. The process can also be carried out without the oxidation basin so that the sludge water from the scrubber 4 is enriched with neutralizing agent and then passed directly into the dryer / cooler / pre-absorber 2.
  • FIG. 2 shows a flow diagram which almost completely corresponds to the diagram in FIG. 1.
  • the dust bag is identified by 1 and the subsequent dryer or cooler by 2.
  • the pre-dedusted hot exhaust gas emerging from the dust bag enters the dryer or cooler, where finely divided, sludge-containing cycle wash water is fed in for cooling and sludge drying .
  • the gas then passes into cyclones 3, where the bulk of the dust remaining in the gas is separated. It is also possible for all of the dry residue (sludge) drawn off to be fed to the cyclones.
  • the gas is fed from the cyclones to the scrubber 4, with cooling to the saturation point in a first stage of the washing process with fresh water and then the residual dust components being removed in a delicate wash, and the hydrogen halides and SO 2 in the system shown in FIG. 2 .
  • the cleaned exhaust gas is then ready for further use on the extractor of the scrubber 4.
  • a trigger fan is indicated here with 9.
  • a lime silo 5 and a lime milk receiver 6 are assigned and the washing water passes from the washer 4 into a basin 7, where the neutralizing agent is simultaneously introduced from the lime milk receiver 6.
  • the sludge water drawn off is fed to the dryer or cooler 2, while the clarified washing liquid is fed back into the scrubber 4.
  • the ash is added to the lime milk reservoir 6 from the silo 10.
  • the ash can come from an e-filter, which is usually the Combustion plants is connected downstream, that would be upstream of the plant shown in FIG. 2. If no ash is available, sand (quartz sand), for example, can also be easily added as a sludge-generating agent.
  • a slightly modified method can be seen from FIG. 3, namely that a weakly acidic solution is used here in the washer and the clarified washing liquid is not returned from the neutralization basin 7 to the washer 4. In this procedure, only hydrogen halide is used, but not SO 2 deposited.
  • the particular advantage of the process according to the invention is that when the common spray drying of salt solutions with suitable additives such as ash, a free-flowing, landfillable, dry product is obtained which does not cause any problems in waste disposal, such as occur in the case of acidic waste sludge.
  • the method according to the invention can - as can be seen from the above explanations - carry out the overall cleaning of the gas from pollutants but also from suspended matter, i.e. it can also be applied to the separators present in the current incineration plants e.g. E-filters are dispensed with, in which case the "aggregate" is still contained in the exhaust gas and necessarily leads to the desired sludge formation during washing.
  • the neutralization in basin 7 can be carried out with lime milk (as indicated) or another neutralizing agent.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

L'operation essentielle du procede consiste en la pulverisation (2) d'eau en circuit ferme sur les poussieres seches des gaz. Les gaz debarrasses de leurs poussieres etant conduits a une installation de lavage (4) qui eloigne les gaz nocifs. Le liquide de lavage (7) est neutralise, le cas echeant mele a des cendres, et remis en circulation.
PCT/DE1979/000128 1978-10-23 1979-10-23 Procede et installation pour depoussierer et absorber les gaz nocifs d'installations d'incineration et de fours a air chaud Ceased WO1980000797A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19782846457 DE2846457C2 (de) 1978-10-23 1978-10-23 Verfahren und Anlage zur Gichtgas-Entstaubung und Schadgasabsorption für einen Heißwindkupolofen
DE2846457 1978-10-23
DE19792929974 DE2929974A1 (de) 1979-07-20 1979-07-20 Verfahren zur entstaubung und schadgasabsorption von abgasen aus abfallverbrennungsanlagen

Publications (1)

Publication Number Publication Date
WO1980000797A1 true WO1980000797A1 (fr) 1980-05-01

Family

ID=25776213

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1979/000128 Ceased WO1980000797A1 (fr) 1978-10-23 1979-10-23 Procede et installation pour depoussierer et absorber les gaz nocifs d'installations d'incineration et de fours a air chaud

Country Status (1)

Country Link
WO (1) WO1980000797A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0230139A1 (fr) * 1986-01-17 1987-07-29 A/S Niro Atomizer Méthode pour purifier un courant chaud de gaz de rejet provenant de l'incinération de déchets

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2261799A1 (fr) * 1974-02-21 1975-09-19 Bischoff Gasreinigung
FR2409080A1 (fr) * 1977-11-17 1979-06-15 Ciba Geigy Ag

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2261799A1 (fr) * 1974-02-21 1975-09-19 Bischoff Gasreinigung
FR2409080A1 (fr) * 1977-11-17 1979-06-15 Ciba Geigy Ag

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0230139A1 (fr) * 1986-01-17 1987-07-29 A/S Niro Atomizer Méthode pour purifier un courant chaud de gaz de rejet provenant de l'incinération de déchets

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