CA2240765A1 - Process for removing sulfur dioxide from flue gasses - Google Patents
Process for removing sulfur dioxide from flue gasses Download PDFInfo
- Publication number
- CA2240765A1 CA2240765A1 CA002240765A CA2240765A CA2240765A1 CA 2240765 A1 CA2240765 A1 CA 2240765A1 CA 002240765 A CA002240765 A CA 002240765A CA 2240765 A CA2240765 A CA 2240765A CA 2240765 A1 CA2240765 A1 CA 2240765A1
- Authority
- CA
- Canada
- Prior art keywords
- scrubbing solution
- scrubbing
- solution
- potassium sulfate
- flue gas
- 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.)
- Abandoned
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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
- B01D53/48—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
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
Abstract
A process for removing sulfur dioxide from flue gasses by scrubbing with a scrubbing solution, in particular for flue gas produced in a waste, sludge, orsewage sludge incineration plant, using a scrubbing solution containing potassium hydroxide.
Description
CA 0224076~ 1998-06-10 Background of the Invention Field of the Invention The invention relates to a process for removing sulfur dioxide from flue gasses by scrubbing with a scrubbing solution.
5 Discussion of the Prior Art It is known that, in flue gas purification plants or flue gas desulfurization plants, the sulfur dioxide present in the flue gasses can be reacted either directly with calcium hydroxide or indirectly by means of a scrubbing solution with addition of sodium hydroxide and subsequent reaction with calcium 10 hydroxide to form gypsum.
A disadvantage of these known processes is that the gypsum obtained, for example in a waste incineration plant, contains impurities and is therefore a useless product. Since the product cannot be utilized, it additionally incurs costs for disposal. The gypsum has to be taken to a landfill which, apart from 15 the high disposal costs, additionally leads to environmental pollution.
Summary of the Invention It is an object of the present invention to provide a process for flue gas purification or for flue gas desulfurization which does not require landfilling and does not cause environmental pollution.
The process of the invention for flue gas desulfurization uses a solution comprising potassium hydroxide for scrubbing the flue gas to remove the sulfur dioxide .
An advantage of the process of the invention is that the sulfur dioxide present in the flue gas reacts with the potassium hydroxide present in the CA 0224076~ l998-06-lO
scrubbing solution to form potassium sulfate which is a marketable, saleable product which can be utilized, in particular as fertilizer.
The flue gas comprising sulfur dioxide is scrubbed with a scrubbing solution which is maintained at a pH of from 4 to 7, preferably a pH of from 5 5 to 6. 5, by addition of potassium hydroxide. The following reactions presumably occur during scrubbing:
a) KOH + SO2 KHSO3 b) 2 KOH + SO2 K2SO3 + H20 C) K2SO3 + 1/2 ~2 K2SO4 The potassium sulfate can be sold as a marketable product as solution or in crystalline form, for example as a fertilizer.
The process of the invention is particularly suitable for purifying flue gasses from waste, sludge or sewage sludge incineration plants.
If the flue gas has a low ~2 content, the reaction c) proceeds slowly. In 15 an advantageous embodiment of the invention, oxygen, for example in the form of compressed air, is introduced into the scrubbing solution, in particularwith formation of turbulence, which significantly accelerates the reaction c).
In another embodiment of the process, trace elements, such as trace metals which may be present in the scrubbing solution in addition to the 20 potassium sulfate, are precipitated completely or specifically in such a way that the fertilizer also contains trace elements in a sufficient concentration. The concentration can be selected so that the fertilizer contains trace elements in a concentration preferred for fertilization or for the fertilization purpose.
The various features of novelty which characterize the invention are 25 pointed out with particularity in the claims annexed to and forming a part ofthe disclosure. For a better understanding of the invention, its operating CA 0224076~ 1998-06-10 advantages, and specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
Brief Description of the Drawings 5 Fig. 1 schematically shows an apparatus for removing sulfur dioxide from flue gasses of a waste incineration plant pursuant to the inventive process.
Detailed Description of the Preferred Embodiments A flue gas R from a combustion chamber (not shown) in which waste 10 is incinerated is fed to the flue gas purification apparatus 1 also referred to as a flue gas scrubber. After flowing through the flow gas purification apparatus 1 the gas is discharged to the environment as purified gas Re. In order to absorb the hydrogen halides (HCI, HF, HBr) present in the flue gasses R
separately from sulfur dioxide S02 and to saturate the flue gas R with water 15 vapour, the flue gas R is first fed to a first scrubbing stage, viz. a quench stage 2, which removes from about 80% to 90% of the hydrogen halides present in the flue gas R. The quench stage 2 has a water circuit 15 and a circulation pump 6a. A substream of the quenching water is conveyed via a line 1 5a and valves not shown to a wastewater treatment plant A. A second scrubbing 20 stage arranged downstream is configured as a packed stage 3 and serves to improve the saturation of the flue gas R and to remove hydrogen halides remaining in the flue gas R after passing through the quench stage 2 so that the purified gas Re and the fertilizer produced have a low halide content. The packed stage 3 has a liquid circuit 14 and a circulation pump 6b. The liquid 25 circuit 14 is connected to the liquid circuit 15 by a connection 14b.
The packed stage 3 is followed by a further packed stage 4 to remove sulfur dioxide. Downstream of the packed stage 4 there is arranged a further scrubbing stage, configured as a fine dust removal stage 5, for example CA 0224076~ 1998-06-10 comprising a ring jet stage. This fine dust removal stage 5 is provided for removal of very fine dust and aerosols and likewise has a liquid circuit 12 witha circulation pump 6d. The liquid circuit 12 is connected to the liquid circuit 14 via the line 1 4c. If removal of very fine dust is achieved by an upstream or5 downstream cloth filter, the ring jet stage can be omitted.
Potassium hydroxide (KOH) is metered into the scrubbing solution W
which is used in the packed stage 4 to remove sulfur dioxide and is conveyed around a liquid circuit 13 by means of a circulation pump 6c. The potassium hydroxide is stored in a stock container (not shown) and is conveyed by a 10 pump 6e through the feed line 1 3c to the liquid circuit 13. In an advantageous embodiment, the pH of the scrubbing solution W is measured using a sensor and this signal is used to control the pump 6e so as to keep the pH of the scrubbing solution W at a pH of from 4 to 7 by means of the addition of potassium hydroxide.
The flue gas R from a waste incineration plant has, for example, an oxygen excess of from 10% to 1 1%. If the waste incineration plant has flue gas recirculation, the oxygen excess in the flue gas R is reduced, for example, to from 6% to 7%, which leads to a high proportion of potassium sulfite (K2SO3) in the scrubbing solution W. In order to reduce the content of 20 potassium sulfite and to increase the content of potassium sulfate, oxygen, for example in the form of compressed air, is advantageously introduced via a line 1 3a into the scrubbing solution W after leaving the packed stage 4, for example by generating turbulence in the scrubbing solution W immediately upstream of the circulation pump 6c so as to significantly accelerate the 25 above-mentioned reaction c).
During scrubbing, the scrubbing solution W usually also takes up traces of heavy metals such as Hg, Cd, Zn or Pb. To obtain a high-quality potassium sulfate, it is found to be advantageous to remove these trace metals and also further trace metals, either partially or completely. This is achieved by addition 30 of a sulfur-containing precipitant which is fed via a feed line 1 3d into the liquid CA 0224076~ 1998-06-10 circuit 13 in order to precipitate sparingly soluble compounds. Suitable precipitants are, for example, trimercaptotriazine or Nalmet~. As a further additive, activated carbon or open-hearth furnace coke can be added in aqueous suspension to achieve the following effects:
5 - to remove organic trace impurities originating from the flue gas, for example chlorinated phenols, benzenes, dioxins or furans, - to remove metallic mercury which can be formed by reduction of mercury compounds, e.g. HgCI2, by residual sulfite concentrations, - as a filtration aid in the downstream filtration located in feed line 1 3b.
The concentration of potassium sulfate in the scrubbing solution W is preferably kept at a constant high value by measuring the concentration in the scrubbing solution W by means of a conductivity measuring apparatus 7 and using this value, via an electrodiode connection 15, as a setting parameter for the regulating valve 8, so that a regulated amount of scrubbing solution W is 15 taken from the circuit 13. The concentration is advantageously regulated suchthat the scrubbing solution W has a potassium sulfate concentration of at most 15%. A filtration apparatus 9 is located downstream of the regulating valve 8 and serves to remove solid constituents such as impurities and additives from the scrubbing solution W. The filtration apparatus 9 is preferably configured as20 a candle filter with membrane-coated filter cloths. The solids collect in theconical bottom of the filtration apparatus 9 and are periodically taken off a sludge via the line 1 4a. The sludge can be recirculated to the liquid circuit 15 of the quench stage 2.
The purified scrubbing solution W is passed to an evaporation or 25 crystallization unit 10 arranged downstream of the filtration apparatus 9. Inthis unit 10, the potassium sulfate concentration is increased to above 20%.
The potassium sulfate which crystallizes is separated off in a downstream decanter 1 1 and discharged as end product via the outlet 1 3e. The remaining solution is recirculated via the line 1 3b to the liquid circuit 13. If the potassium 30 sulfate is required only in the form of a solution, crystallization of the CA 0224076~ 1998-06-10 potassium sulfate can be omitted by concentrating the scrubbing solution W
to, for example, 15% by evaporation and then selling it as solution.
The invention is not limited by the embodiments described above which are presented as examples only but can be modified in various ways within the 5 scope of protection defined by the appended patent claims.
5 Discussion of the Prior Art It is known that, in flue gas purification plants or flue gas desulfurization plants, the sulfur dioxide present in the flue gasses can be reacted either directly with calcium hydroxide or indirectly by means of a scrubbing solution with addition of sodium hydroxide and subsequent reaction with calcium 10 hydroxide to form gypsum.
A disadvantage of these known processes is that the gypsum obtained, for example in a waste incineration plant, contains impurities and is therefore a useless product. Since the product cannot be utilized, it additionally incurs costs for disposal. The gypsum has to be taken to a landfill which, apart from 15 the high disposal costs, additionally leads to environmental pollution.
Summary of the Invention It is an object of the present invention to provide a process for flue gas purification or for flue gas desulfurization which does not require landfilling and does not cause environmental pollution.
The process of the invention for flue gas desulfurization uses a solution comprising potassium hydroxide for scrubbing the flue gas to remove the sulfur dioxide .
An advantage of the process of the invention is that the sulfur dioxide present in the flue gas reacts with the potassium hydroxide present in the CA 0224076~ l998-06-lO
scrubbing solution to form potassium sulfate which is a marketable, saleable product which can be utilized, in particular as fertilizer.
The flue gas comprising sulfur dioxide is scrubbed with a scrubbing solution which is maintained at a pH of from 4 to 7, preferably a pH of from 5 5 to 6. 5, by addition of potassium hydroxide. The following reactions presumably occur during scrubbing:
a) KOH + SO2 KHSO3 b) 2 KOH + SO2 K2SO3 + H20 C) K2SO3 + 1/2 ~2 K2SO4 The potassium sulfate can be sold as a marketable product as solution or in crystalline form, for example as a fertilizer.
The process of the invention is particularly suitable for purifying flue gasses from waste, sludge or sewage sludge incineration plants.
If the flue gas has a low ~2 content, the reaction c) proceeds slowly. In 15 an advantageous embodiment of the invention, oxygen, for example in the form of compressed air, is introduced into the scrubbing solution, in particularwith formation of turbulence, which significantly accelerates the reaction c).
In another embodiment of the process, trace elements, such as trace metals which may be present in the scrubbing solution in addition to the 20 potassium sulfate, are precipitated completely or specifically in such a way that the fertilizer also contains trace elements in a sufficient concentration. The concentration can be selected so that the fertilizer contains trace elements in a concentration preferred for fertilization or for the fertilization purpose.
The various features of novelty which characterize the invention are 25 pointed out with particularity in the claims annexed to and forming a part ofthe disclosure. For a better understanding of the invention, its operating CA 0224076~ 1998-06-10 advantages, and specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
Brief Description of the Drawings 5 Fig. 1 schematically shows an apparatus for removing sulfur dioxide from flue gasses of a waste incineration plant pursuant to the inventive process.
Detailed Description of the Preferred Embodiments A flue gas R from a combustion chamber (not shown) in which waste 10 is incinerated is fed to the flue gas purification apparatus 1 also referred to as a flue gas scrubber. After flowing through the flow gas purification apparatus 1 the gas is discharged to the environment as purified gas Re. In order to absorb the hydrogen halides (HCI, HF, HBr) present in the flue gasses R
separately from sulfur dioxide S02 and to saturate the flue gas R with water 15 vapour, the flue gas R is first fed to a first scrubbing stage, viz. a quench stage 2, which removes from about 80% to 90% of the hydrogen halides present in the flue gas R. The quench stage 2 has a water circuit 15 and a circulation pump 6a. A substream of the quenching water is conveyed via a line 1 5a and valves not shown to a wastewater treatment plant A. A second scrubbing 20 stage arranged downstream is configured as a packed stage 3 and serves to improve the saturation of the flue gas R and to remove hydrogen halides remaining in the flue gas R after passing through the quench stage 2 so that the purified gas Re and the fertilizer produced have a low halide content. The packed stage 3 has a liquid circuit 14 and a circulation pump 6b. The liquid 25 circuit 14 is connected to the liquid circuit 15 by a connection 14b.
The packed stage 3 is followed by a further packed stage 4 to remove sulfur dioxide. Downstream of the packed stage 4 there is arranged a further scrubbing stage, configured as a fine dust removal stage 5, for example CA 0224076~ 1998-06-10 comprising a ring jet stage. This fine dust removal stage 5 is provided for removal of very fine dust and aerosols and likewise has a liquid circuit 12 witha circulation pump 6d. The liquid circuit 12 is connected to the liquid circuit 14 via the line 1 4c. If removal of very fine dust is achieved by an upstream or5 downstream cloth filter, the ring jet stage can be omitted.
Potassium hydroxide (KOH) is metered into the scrubbing solution W
which is used in the packed stage 4 to remove sulfur dioxide and is conveyed around a liquid circuit 13 by means of a circulation pump 6c. The potassium hydroxide is stored in a stock container (not shown) and is conveyed by a 10 pump 6e through the feed line 1 3c to the liquid circuit 13. In an advantageous embodiment, the pH of the scrubbing solution W is measured using a sensor and this signal is used to control the pump 6e so as to keep the pH of the scrubbing solution W at a pH of from 4 to 7 by means of the addition of potassium hydroxide.
The flue gas R from a waste incineration plant has, for example, an oxygen excess of from 10% to 1 1%. If the waste incineration plant has flue gas recirculation, the oxygen excess in the flue gas R is reduced, for example, to from 6% to 7%, which leads to a high proportion of potassium sulfite (K2SO3) in the scrubbing solution W. In order to reduce the content of 20 potassium sulfite and to increase the content of potassium sulfate, oxygen, for example in the form of compressed air, is advantageously introduced via a line 1 3a into the scrubbing solution W after leaving the packed stage 4, for example by generating turbulence in the scrubbing solution W immediately upstream of the circulation pump 6c so as to significantly accelerate the 25 above-mentioned reaction c).
During scrubbing, the scrubbing solution W usually also takes up traces of heavy metals such as Hg, Cd, Zn or Pb. To obtain a high-quality potassium sulfate, it is found to be advantageous to remove these trace metals and also further trace metals, either partially or completely. This is achieved by addition 30 of a sulfur-containing precipitant which is fed via a feed line 1 3d into the liquid CA 0224076~ 1998-06-10 circuit 13 in order to precipitate sparingly soluble compounds. Suitable precipitants are, for example, trimercaptotriazine or Nalmet~. As a further additive, activated carbon or open-hearth furnace coke can be added in aqueous suspension to achieve the following effects:
5 - to remove organic trace impurities originating from the flue gas, for example chlorinated phenols, benzenes, dioxins or furans, - to remove metallic mercury which can be formed by reduction of mercury compounds, e.g. HgCI2, by residual sulfite concentrations, - as a filtration aid in the downstream filtration located in feed line 1 3b.
The concentration of potassium sulfate in the scrubbing solution W is preferably kept at a constant high value by measuring the concentration in the scrubbing solution W by means of a conductivity measuring apparatus 7 and using this value, via an electrodiode connection 15, as a setting parameter for the regulating valve 8, so that a regulated amount of scrubbing solution W is 15 taken from the circuit 13. The concentration is advantageously regulated suchthat the scrubbing solution W has a potassium sulfate concentration of at most 15%. A filtration apparatus 9 is located downstream of the regulating valve 8 and serves to remove solid constituents such as impurities and additives from the scrubbing solution W. The filtration apparatus 9 is preferably configured as20 a candle filter with membrane-coated filter cloths. The solids collect in theconical bottom of the filtration apparatus 9 and are periodically taken off a sludge via the line 1 4a. The sludge can be recirculated to the liquid circuit 15 of the quench stage 2.
The purified scrubbing solution W is passed to an evaporation or 25 crystallization unit 10 arranged downstream of the filtration apparatus 9. Inthis unit 10, the potassium sulfate concentration is increased to above 20%.
The potassium sulfate which crystallizes is separated off in a downstream decanter 1 1 and discharged as end product via the outlet 1 3e. The remaining solution is recirculated via the line 1 3b to the liquid circuit 13. If the potassium 30 sulfate is required only in the form of a solution, crystallization of the CA 0224076~ 1998-06-10 potassium sulfate can be omitted by concentrating the scrubbing solution W
to, for example, 15% by evaporation and then selling it as solution.
The invention is not limited by the embodiments described above which are presented as examples only but can be modified in various ways within the 5 scope of protection defined by the appended patent claims.
Claims (16)
1. A process for removing sulfur dioxide from flue gas, comprising the steps of: scrubbing the flue gas with a scrubbing solution comprising potassium hydroxide solution (KOH); and obtaining potassium sulfate from the scrubbing solution.
2. A process as defined in claim 1, including introducing the potassium hydroxide solution into the scrubbing solution in an amount so that the scrubbing solution has a pH from 4 to 7.
3. A process as defined in claim 2, including introducing the potassium hydroxide solution into the scrubbing solution so that the pH of the scrubbing solution is from 5 to 6.5.
4. A process as defined in claim 1, including maintaining the potassium sulfate formed in the scrubbing solution at a concentration of at most 15 %.
5. A process as defined in claim 1, and further comprising the step of introducing oxygen into the scrubbing solution for oxidizing any potassium sulfite present into potassium sulfate.
6. A process as defined in claim 5, wherein the oxygen introducing step includes introducing air into the scrubbing solution.
7. A process as defined in claim 5, wherein the oxygen introducing step includes introducing compressed air into the scrubbing solution.
8. A process as defined in claim 1, and further comprising the step of adding an additive to the scrubbing solution.
9. A process as defined in claim 8, wherein the additive adding step includes adding at least one of a sulfur-containing precipitant and an adsorbentto the scrubbing solution.
10. A process as defined in claim 8, wherein the adsorbent is activated carbon.
11. A process as defined in claim 1, and further comprising the step of concentrating the potassium sulfate present in the scrubbing solution to give one of a saleable solution and a crystallized potassium sulfate.
12. A process as defined in claim 1, and further comprising partially precipitating trace elements from the scrubbing solution to produce potassium sulfate containing trace elements.
13. A process as defined in claim 12, wherein the trace elements are trace metals.
14. A fertilizer produced by removing sulfur dioxide from flue gas by scrubbing the flue gas with a scrubbing solution comprising potassium hydroxide, obtaining potassium sulfate from the scrubbing solution and concentrating the potassium sulfate present in the scrubbing solution to give the fertilizer.
15. A fertilizer as defined in claim 14, wherein trace elements are partially precipitated from the scrubbing solution to produce potassium sulfate containing trace elements.
16. A fertilizer as defined in claim 15, wherein the trace elements are trace metals.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH19971452/97 | 1997-06-13 | ||
| CH145297 | 1997-06-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2240765A1 true CA2240765A1 (en) | 1998-12-13 |
Family
ID=4210803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002240765A Abandoned CA2240765A1 (en) | 1997-06-13 | 1998-06-10 | Process for removing sulfur dioxide from flue gasses |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0884092A1 (en) |
| JP (1) | JPH1170317A (en) |
| KR (1) | KR19990006890A (en) |
| CA (1) | CA2240765A1 (en) |
| CZ (1) | CZ183798A3 (en) |
| HU (1) | HUP9801348A2 (en) |
| NO (1) | NO982684L (en) |
| PL (1) | PL326775A1 (en) |
| TW (1) | TW358038B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6363869B1 (en) * | 1999-02-03 | 2002-04-02 | Clearstack Combustion Corporation | Potassium hydroxide flue gas injection technique to reduce acid gas emissions and improve electrostatic precipitator performance |
| KR100742336B1 (en) * | 2005-06-17 | 2007-07-24 | 주식회사 실트론 | Apparatus and method for controlling the concentration of scrubbing solution using in scrubber |
| JP5851440B2 (en) * | 2013-03-11 | 2016-02-03 | 日本山村硝子株式会社 | Selenium recovery system and method for recovering selenium in exhaust gas |
| DE102014007746A1 (en) * | 2014-05-30 | 2015-12-03 | Rwe Power Aktiengesellschaft | A process for removing mercury from the scrubbing suspension of a wet scrubber and adsorbent for use in a wet scrubber |
| US10005667B2 (en) * | 2015-12-30 | 2018-06-26 | Tessenderlo Kerley, Inc. | Sulfur dioxide scrubbing system and process for producing potassium products |
| KR102603249B1 (en) * | 2020-12-21 | 2023-11-15 | 주식회사 포스코 | Manufacturing method of lithium compound |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4201753A (en) * | 1978-01-26 | 1980-05-06 | Gilbert Associates, Inc. | Flue gas desulfurization process |
| DE3235559A1 (en) * | 1982-09-25 | 1984-05-24 | Metallgesellschaft Ag, 6000 Frankfurt | Process for the removal of sulphur oxides from flue gas |
| FI73603C (en) * | 1985-06-17 | 1987-11-09 | Catena Oy | Process for collecting and utilizing the sulfur dioxide in sulfur-containing gases such as flue gases. |
| DE3526008A1 (en) * | 1985-07-20 | 1987-01-22 | Metallgesellschaft Ag | METHOD FOR REMOVING POLLUTANTS FROM SMOKE GAS |
| DE3607357C1 (en) * | 1986-03-06 | 1987-05-07 | Babcock Anlagen Ag | Process for cleaning flue gases containing SO2 |
| JPH07100331A (en) * | 1993-10-04 | 1995-04-18 | Idemitsu Eng Co Ltd | Flue gas desulfurizing method |
| JPH08108042A (en) * | 1994-10-14 | 1996-04-30 | Tatsuyasu Nishimura | Desulfurization and denitrification of flue gas,method and device for removal of carbon dioxide and catalyst and absorbent used therein |
-
1998
- 1998-06-05 TW TW087108954A patent/TW358038B/en active
- 1998-06-09 EP EP98110590A patent/EP0884092A1/en not_active Withdrawn
- 1998-06-10 CA CA002240765A patent/CA2240765A1/en not_active Abandoned
- 1998-06-10 PL PL98326775A patent/PL326775A1/en unknown
- 1998-06-11 KR KR1019980021723A patent/KR19990006890A/en not_active Application Discontinuation
- 1998-06-11 NO NO982684A patent/NO982684L/en not_active Application Discontinuation
- 1998-06-12 JP JP10165087A patent/JPH1170317A/en active Pending
- 1998-06-12 CZ CZ981837A patent/CZ183798A3/en unknown
- 1998-06-12 HU HU9801348A patent/HUP9801348A2/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| HU9801348D0 (en) | 1998-08-28 |
| TW358038B (en) | 1999-05-11 |
| KR19990006890A (en) | 1999-01-25 |
| PL326775A1 (en) | 1998-12-21 |
| NO982684L (en) | 1998-12-14 |
| NO982684D0 (en) | 1998-06-11 |
| CZ183798A3 (en) | 1999-03-17 |
| JPH1170317A (en) | 1999-03-16 |
| EP0884092A1 (en) | 1998-12-16 |
| HUP9801348A2 (en) | 1999-06-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |