SE425293B - Method for removing sulphur dioxide from exhaust gases - Google Patents

Method for removing sulphur dioxide from exhaust gases

Info

Publication number
SE425293B
SE425293B SE8006603A SE8006603A SE425293B SE 425293 B SE425293 B SE 425293B SE 8006603 A SE8006603 A SE 8006603A SE 8006603 A SE8006603 A SE 8006603A SE 425293 B SE425293 B SE 425293B
Authority
SE
Sweden
Prior art keywords
additive
flue gas
liquid phase
absorption
dust
Prior art date
Application number
SE8006603A
Other languages
Swedish (sv)
Other versions
SE8006603L (en
Inventor
L Lindau
S Ahman
Original Assignee
Flaekt Ab
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 Flaekt Ab filed Critical Flaekt Ab
Priority to SE8006603A priority Critical patent/SE425293B/en
Priority to AT81107351T priority patent/ATE11229T1/en
Priority to DE8181107351T priority patent/DE3168330D1/en
Priority to EP81107351A priority patent/EP0048449B1/en
Priority to FI812941A priority patent/FI74626C/en
Priority to NO813198A priority patent/NO153321C/en
Priority to DK418381A priority patent/DK153212C/en
Publication of SE8006603L publication Critical patent/SE8006603L/en
Publication of SE425293B publication Critical patent/SE425293B/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/06—Spray cleaning
    • 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
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds

Landscapes

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

Abstract

In this method of cleaning exhaust gases by removing the sulphur dioxide, the hot gas is brought into contact with an absorption liquid in a drying apparatus, where evaporation of any water carried in and reaction between the sulphur dioxide and the absorption material take place, after which the solids are removed in a dust separator. In order to bring about a higher reaction speed in the dust separator, a substance is added to the exhaust gas which forms a liquid phase distributed over the surface of the solids. The liquid phase normally contains water and has good solubility for reactants and products of reaction.

Description

15 20 25 80066 03- 8 som råder vid absorptiøn av svaveldioxid ur rökgaser från fossiïeïdade panncr är bïand annat: FeC13, Fe(N03)3, Fe(N03)2, A1(N03)3, Ca(N03)2, Mg(C103)2, MnC12, KZSO4 . MgS04, NaA1(S04)¿, NaCi0, Na3P04, Na2Si03, Na2S04, Zn(N0 3)2. 80066 03- 8 prevailing in the absorption of sulfur dioxide from flue gases from fossil-fired boilers are among others: FeCl 3, Fe (NO 3) 3, Fe (NO 3) 2, Al (NO 3) 3, Ca (NO 3) 2, Mg ( C103) 2, MnCl2, K2SO4. MgSO 4, NaAl (SO 4) ¿, NaClO, Na 3 PO 4, Na 2 SiO 3, Na 2 SO 4, Zn (NO 3) 2.

Exempel I en försöksanïäggning med en kapacitet av 10 000 Nm3/tim bestående av en torkapparat i vilken atomiserad absorptionsvätska insprutas jämte ett textiït spärrfiïter som stortavskiljare utfördes försök för att faststäïïa prestanda med och utan tiïïsats av några av ovanstående ämnen. Som absörbent användes kaïciumhydroxid, viïket tiïisattes i en mängd som svarar mot ett moïförhåïlande Ca/S02 = 1,1 (räknat på ingående gas). Ingående gas hade en temperatur på 140°C och ett S02-innehåïï av 850 ppm. Det textila spärrfiïtrets beïastning var 92 m/tim. Gasens temperatur efter passage av spärr- fiitret var 70°C. Härvid uppmättes föïjande avskiïjningsgraderz Försök nr Tiïïsats Avskiïjning, % 1 - 70 2 FeC13 74 3 FeS04 83 4 Fe(N03)3 81 5 A1(NO3)3 71 6 Ca(N03)2 76 7 NaAJ(S04)¿ 78 8 NaS04 74 9 Zn(N03)2 77Example In a test plant with a capacity of 10,000 Nm3 / h consisting of a dryer in which atomized absorption liquid is injected together with a textile barrier filter as a bulk separator, attempts were made to determine performance with and without the addition of any of the above substances. As the absorbent, calcium hydroxide was used, which was added in an amount corresponding to a ratio Ca / SO 2 = 1.1 (based on the input gas). The incoming gas had a temperature of 140 ° C and an SO 2 content of 850 ppm. The load of the textile barrier fiber was 92 m / h. The temperature of the gas after passing the barrier filter was 70 ° C. The following deposition rates were measured. Experiment no. Deposition Deposition,% 1 - 70 2 FeCl 3 74 3 FeSO 4 83 4 Fe (NO 3) 3 81 5 A 1 (NO 3) 3 71 6 Ca (NO 3) 2 76 7 NaAJ (SO 4) ¿78 8 Na 9 Zn (NO3) 2 77

Claims (8)

1. (H l5 20 25 8006603-8 PATENTKRÅV l. Sätt att rena rökgaser från svaveldioxid i en i en våt-torr process, vilken omfattar ett tork och absorptionssteg där en absorp- tionsvätska tillföres rökgasen samt ett stoftavskiljnings- och sekundärt absorptionssteg, k ä n n e t e c k n a t a v att förutom absorptionsvätskan sättes ett tillsatsämne till rökgasen vilket i stoftavskiljaren bildar en flytande fas distribuerad över de fasta fasernas yta.1. (H l5 20 25 8006603-8 PATENT CLEARANCE 1. Method of purifying flue gases from sulfur dioxide in a wet-dry process, which comprises a drying and absorption step where an absorption liquid is supplied to the flue gas and a dust separation and secondary absorption step, k It is indicated that in addition to the absorption liquid an additive is added to the flue gas which in the dust separator forms a liquid phase distributed over the surface of the solid phases. 2. Sätt enligt krav l, k ä n n e t e c k n a t a v att den flytande fasen är vattenhaltig samt har god löslighet för reaktanter och reaktionsprodukter.2. A method according to claim 1, characterized in that the liquid phase is aqueous and has good solubility for reactants and reaction products. 3. Sätt enligt patentkrav l, k ä n n e t e c k n a t a v att den tillsats, som i stoftavskiljaren bildar en flytande fas utgöres av något av ämnena FeCl3, Fe(N03)3, Fe(NO3)2, Al(N03)3, Ca(N03)2, Mg(Cl03)2, MnCl2, KZSO4 . MgSD4, NaAl(S04)2, NaCl0, Na3P04, Na2Si03, Na2S04, Zn(N03)2.3. A method according to claim 1, characterized in that the additive which forms a liquid phase in the dust trap consists of one of the substances FeCl 3, Fe (NO 3) 3, Fe (NO 3) 2, Al (NO 3) 3, Ca (NO 3) 2, Mg (ClO 3) 2, MnCl 2, K 2 SO 4. MgSD 4, NaAl (SO 4) 2, NaClO, Na 3 PO 4, Na 2 SiO 3, Na 2 SO 4, Zn (NO 3) 2. 4. Sätt enligt patentkrav l-3, k ä n n e t e c k n a t a v att tillsatsämnet utgör maximalt 20 volymprocent, företrädesvis maximalt 5 volymprocent, av de i stoftavskiljaren föreliggande fasta faserna.4. A method according to claims 1-3, characterized in that the additive constitutes a maximum of 20% by volume, preferably a maximum of 5% by volume, of the solid phases present in the dust collector. 5. Sätt enligt patentkrav l-4, k ä n n e t e c k n a t a v att absorbenten utgöres av kalciumhydroxid, kalciumkarbonat, magnesiumkalciumkarbonat, natriumkarbonat, natriumhydroxid eller blandningar därav. o.5. A method according to claims 1-4, characterized in that the absorbent consists of calcium hydroxide, calcium carbonate, magnesium calcium carbonate, sodium carbonate, sodium hydroxide or mixtures thereof. O. 6. Sätt enligt patentkrav l-2, att tillsatsämnet åtminstone delvis extraheras ur av ur rökgasen k ä n n e t e c k n a t a v avskild flygaska.6. A method according to claim 1-2, that the additive is at least partially extracted from flue gas known from the flue gas. 7. Sätt enligt patentkrav l-6, k ä n n e t e c k n a t a v att tillsatsämnet blandas i absorptionsvätskan före dess atomisering.7. A method according to claims 1-6, characterized in that the additive is mixed in the absorption liquid before its atomization. 8. Sätt enligt patentkrav l-6, k ä n n e t e c k n a t a v att tillsatsämnet tillsättes rökgasen medelst ett speciellt atomiseringsorgan. 8006605-8 V, _* å s A Mhrjuxe ng: R A e a wrap* gv-àçgfwá' _ .. . Vid rening av rökgaser från svaveïdioxid bríngas den varma gasen í kontakt med en absorptíonsvätska i en torkapparat där förångning av tílïfört vatten samt reaktion mellan svaveïdioxíd och absorptíonsämnet äger rum, varefter den fasta produktfasen avskí1jes 1 en stoftavskiïjare. För att åstadkomma en högre reaktionshastíghet i stoftavskíljaren tí11sättes tiïï rökgasen ett ämne som biïdar en fïytande fas distribuerad över de fasta fasernas yta. Den flytande fasen är vanïígen vattenhaïtig och har god ïösïighet för reaktanter och reaktíonsprodukter.8. A method according to claims 1-6, characterized in that the additive is added to the flue gas by means of a special atomizing means. 8006605-8 V, _ * å s A Mhrjuxe ng: R A e a wrap * gv-àçgfwá '_ ... When purifying flue gases from sulfur dioxide, the hot gas is brought into contact with an absorption liquid in a dryer where evaporation of supplied water and reaction between sulfur dioxide and the absorption substance takes place, after which the solid product phase is separated in a dust separator. In order to achieve a higher reaction rate in the dust separator, a substance is added to the flue gas which provides a liquid phase distributed over the surface of the solid phases. The liquid phase is usually aqueous and has good solubility for reactants and reaction products.
SE8006603A 1980-09-22 1980-09-22 Method for removing sulphur dioxide from exhaust gases SE425293B (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
SE8006603A SE425293B (en) 1980-09-22 1980-09-22 Method for removing sulphur dioxide from exhaust gases
AT81107351T ATE11229T1 (en) 1980-09-22 1981-09-17 PROCESS FOR SEPARATING ACIDIC GAS COMPONENTS FROM GASES, ESPECIALLY SULFUR DIOXIDE FROM EXHAUST GASES.
DE8181107351T DE3168330D1 (en) 1980-09-22 1981-09-17 Method of purifying gases from acid gas components, especially purifying flue gases from sulphur dioxide
EP81107351A EP0048449B1 (en) 1980-09-22 1981-09-17 Method of purifying gases from acid gas components, especially purifying flue gases from sulphur dioxide
FI812941A FI74626C (en) 1980-09-22 1981-09-21 SAETT ATT RENA GASER FRAON SURA GASKOMPONENTER, SPECIELLT ROEKGASER FRAON SVAVELDIOXID.
NO813198A NO153321C (en) 1980-09-22 1981-09-21 PROCEDURE FOR CLEANING OF GASES FOR AA REMOVE ACID COMPONENTS FROM THESE, SPECIAL SULFUR Dioxide FROM SMOKE GASES
DK418381A DK153212C (en) 1980-09-22 1981-09-21 PROCEDURES FOR CLEANING GASES FOR THE REMOVAL OF ACID COMPONENTS FROM THESE, SPECIFIC Sulfur Dioxide From Exhaust Gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8006603A SE425293B (en) 1980-09-22 1980-09-22 Method for removing sulphur dioxide from exhaust gases

Publications (2)

Publication Number Publication Date
SE8006603L SE8006603L (en) 1982-03-23
SE425293B true SE425293B (en) 1982-09-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
SE8006603A SE425293B (en) 1980-09-22 1980-09-22 Method for removing sulphur dioxide from exhaust gases

Country Status (1)

Country Link
SE (1) SE425293B (en)

Also Published As

Publication number Publication date
SE8006603L (en) 1982-03-23

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