DE2800994C2 - Process for shortening the oxidation of CaSO↓3↓ sludge resulting from the SO↓2↓ washing process - Google Patents
Process for shortening the oxidation of CaSO↓3↓ sludge resulting from the SO↓2↓ washing processInfo
- Publication number
- DE2800994C2 DE2800994C2 DE19782800994 DE2800994A DE2800994C2 DE 2800994 C2 DE2800994 C2 DE 2800994C2 DE 19782800994 DE19782800994 DE 19782800994 DE 2800994 A DE2800994 A DE 2800994A DE 2800994 C2 DE2800994 C2 DE 2800994C2
- Authority
- DE
- Germany
- Prior art keywords
- darr
- washing liquid
- calcium
- gas
- weight
- 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.)
- Expired
Links
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
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
- C01F11/464—Sulfates of Ca from gases containing sulfur oxides
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Geology (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)
Description
Die Erfindung betrifft ein Verfahren zum Reinigen von Rauchgasen und anderen Abgasen, die Schwefeldioxyd enthalten, bei dem das Gas mit einer im Kreislauf gefahrenen Waschflüssigkeit in Kontakt gebracht wird, der Kalziumkarbonat und/oder Kalziumoxyd und/oder Kalziumhydroxyd zugesetzt werden und deren in Lösung befindliche Kalziumionen beim Waschvorgang das Schwefeldioxyd des Gases binden, und bei dem die gebildeten Verbindungen mittels Luftsauerstoff zu Kalziumsulfat oxidiert werden und aus dem Kreislauf abgeschieden werden, wobei der Waschflüssigkeit als Zusatz Salze und/oder eine Mineralsäure zugegeben werden, die Waschflüssigkeit vor dem Kontakt mit dem Gas von Feststoffen befreit wird und der Waschflüssigkeit vor dem Kontakt mit dem Gas zusätzlich eine zur Pufferung dienende Karbonsäure und/oder deren Salz zugegeben wird, nach Patent 25 32 373.The invention relates to a method for cleaning flue gases and other exhaust gases that contain sulphur dioxide, in which the gas is brought into contact with a circulating washing liquid to which calcium carbonate and/or calcium oxide and/or calcium hydroxide are added and whose calcium ions in solution bind the sulphur dioxide of the gas during the washing process, and in which the compounds formed are oxidised to calcium sulphate by means of atmospheric oxygen and are separated from the circuit, wherein salts and/or a mineral acid are added to the washing liquid as an additive, the washing liquid is freed of solids before contact with the gas and a carboxylic acid and/or its salt is additionally added to the washing liquid before contact with the gas for buffering purposes, according to patent 25 32 373.
Die Oxidation nach dem genannten Verfahren muß mehrere Minuten nach der Kontaktierung der Waschflüssigkeit mit dem Rohgas in einem gesonderten Behälter mittels Luftzugabe durchgeführt werden.The oxidation according to the above-mentioned process must be carried out several minutes after the contact of the scrubbing liquid with the raw gas in a separate container by adding air.
Um diese Oxidationsverweilzeit auf ein Minimum herabzusetzen und teilweise, je nach Größe der Rauchgasentschwefelungsanlage, den Oxideur vollkommen einzusparen, wird erfindungsgemäß vorgeschlagen, die Waschflüssigkeit soweit mit Kalziumchlorid anzureichern, daß sie mindestens einen Gewichtsprozentanteil von 5% erhält.In order to reduce this oxidation residence time to a minimum and, depending on the size of the flue gas desulphurisation plant, to completely eliminate the need for the oxidiser, it is proposed according to the invention to enrich the washing liquid with calcium chloride to such an extent that it contains at least 5% by weight.
Vorzugsweise weist die Waschflüssigkeit einen Kalziumchloridgehalt zwischen 15 und 25 Gewichtsprozent und einen Karbonsäuregehalt unter 1 Gewichtsprozent auf. Bevorzugt beträgt der Kalziumchloridgehalt der Waschflüssigkeit 1 g/l.The washing liquid preferably has a calcium chloride content of between 15 and 25 percent by weight and a carboxylic acid content of less than 1 percent by weight. The calcium chloride content of the washing liquid is preferably 1 g/l.
Durch den erhöhten Kalziumchloridgehalt in Anwesenheit von Karbonsäure oder deren Salzen setzt die Oxidation bereits schon kurz nach der Kontaktierung der Waschflüssigkeit mit dem Rohgas ein und ist in der Regel bereits nach dem Austritt der Waschflüssigkeit aus dem Gaswäscher vollendet.Due to the increased calcium chloride content in the presence of carboxylic acid or its salts, oxidation begins shortly after the scrubbing liquid comes into contact with the raw gas and is usually completed after the scrubbing liquid leaves the gas scrubber.
Bei größeren Anlagen kann ein Wassersammelbehälter nach dem Wäscher eingesetzt werden, der kurzzeitig die gesamten Wassermengen, die aus dem Wäscher anfallen, aufnimt und über eine Luftbrause die Oxidation sehr schnell vollzogen wird.In larger systems, a water collection tank can be installed after the washer, which temporarily collects the entire amount of water coming from the washer and allows the oxidation to be carried out very quickly via an air shower.
Die Wandlung von Kalziumsulfit zu Kalziumsulfat-Dihydrat bei minimalem Lufteinsatz ist gewährleistet, wenn im Wäscher oder in einem kleinen Waschflüssigkeitsaufnahmebehälter, in dem die Leitungen für die aus dem Wäscher zurückfließende Waschflüssigkeit eingetaucht sind, der z. B. auch gleichzeitig als Wasserpumpe und Vorlagebehälter benutzt wird, eine Belüftungsvorrichtung, vorzugsweise in Form einer Luftbrause zugesetzt oder diese Luftbrause bereits im Waschwassersammelbereich des Wäschers ausbläst oder Wasserabflußleitung mit einer Luftzugabe versehen ist, wobei bei der erfindungsgemäßen Konzentration von über mindestens 5% Gewichtsanteil CaCl2 und einem entsprechenden geringen Zusatz von Karbonsäure oder derem Salz die Gewähr gegeben ist, daß eine stark beschleunigte Oxidation zu CaSO4 stattfindet.The conversion of calcium sulphite to calcium sulphate dihydrate with minimal use of air is ensured if an aeration device, preferably in the form of an air shower, is added to the washer or to a small washing liquid receiving container in which the lines for the washing liquid flowing back from the washer are immersed, which is also used, for example, as a water pump and storage container at the same time, or if this air shower already blows out in the washing water collection area of the washer or if the water discharge line is provided with an air supply, whereby with the concentration according to the invention of at least 5% by weight of CaCl 2 and a correspondingly small addition of carboxylic acid or its salt, it is guaranteed that a strongly accelerated oxidation to CaSO 4 takes place.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19782800994 DE2800994C2 (en) | 1978-01-11 | 1978-01-11 | Process for shortening the oxidation of CaSO↓3↓ sludge resulting from the SO↓2↓ washing process |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19782800994 DE2800994C2 (en) | 1978-01-11 | 1978-01-11 | Process for shortening the oxidation of CaSO↓3↓ sludge resulting from the SO↓2↓ washing process |
Publications (2)
Publication Number | Publication Date |
---|---|
DE2800994A1 DE2800994A1 (en) | 1979-07-19 |
DE2800994C2 true DE2800994C2 (en) | 1989-08-31 |
Family
ID=6029279
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19782800994 Expired DE2800994C2 (en) | 1978-01-11 | 1978-01-11 | Process for shortening the oxidation of CaSO↓3↓ sludge resulting from the SO↓2↓ washing process |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2800994C2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5558848A (en) * | 1993-08-20 | 1996-09-24 | Moser; Robert E. | Clear liquid acid flue gas desulfurization system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2532373C3 (en) * | 1975-07-19 | 1983-12-08 | Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck | Method and device for cleaning flue gases and other exhaust gases containing sulfur dioxide |
US4022869A (en) * | 1974-11-15 | 1977-05-10 | Kureha Kagaku Kogyo Kabushiki Kaisha | Method for removing hydrogen chloride from exhaust gas containing same |
-
1978
- 1978-01-11 DE DE19782800994 patent/DE2800994C2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2800994A1 (en) | 1979-07-19 |
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Legal Events
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