CA2141302A1 - A process for the conditioning of flue gases - Google Patents
A process for the conditioning of flue gasesInfo
- Publication number
- CA2141302A1 CA2141302A1 CA002141302A CA2141302A CA2141302A1 CA 2141302 A1 CA2141302 A1 CA 2141302A1 CA 002141302 A CA002141302 A CA 002141302A CA 2141302 A CA2141302 A CA 2141302A CA 2141302 A1 CA2141302 A1 CA 2141302A1
- Authority
- CA
- Canada
- Prior art keywords
- conditioning
- flue gases
- flue gas
- solids
- spray drying
- 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
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D51/00—Auxiliary pretreatment of gases or vapours to be cleaned
- B01D51/10—Conditioning the gas to be cleaned
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/18—Evaporating by spraying to obtain dry solids
-
- 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
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen 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
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treating Waste Gases (AREA)
- Sampling And Sample Adjustment (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A process for the conditioning of flue gases polluted with solids, particularly from incinerating plants, for subsequent flue gas purification, preferably with dry additives, by spraying water into the gas stream, wherein said water is sprayed into the gas stream through a preceding spray drying installation, prefer-ably having a rotating atomizer.
Description
~ 2141302 SMB
A Process for the Conditioning of Flue Gases The object of the present invention is a process for the con-ditioning of flue gases polluted with solids, particularly from incinerating plants, for subsequent flue gas purification, preferably with dry additives, by spraying water into the gas stream.
For the purification of flue gases, it is necessary in general to condition the flue gas in terms of temperature and steam con-tent. In wet flue gas purification processes, for instance, this conditioning takes place in a quencher. For the purification of flue gases with dry additives, water is conventionally sprayed into the flue gas stream by means of spray lances. Subsequent ~lue gas purification with dry additives then causes elimination of acidic components, such as HCl, HF, SO2, and NOx. If the flue gases are polluted by solids, the latter are considerably en-riched in the quencher and thus channeled out of the process. In the flue gas purification with dry additives, the solid impur-ities are channeled out of the process and hence removed from the flue gas along with the dry additives. If the flue gases are conditioned by spraying in water by means of spray lances, high solids pollutions result in undesirable and obtrusive sticking and caking which may also interfere with the subsequent purifica-tion with dry additives. Such sticking and caking is observed in particular in cases when spraying of the water is done in an uneven manner and larger droplets get into the flue gas stream as well in addition to fine mists.
Unsufficient conditioning of the flue gases will result in un-sufficient purification. Overdosing of the water will result in sticking and caking of the solids present in the flue gas and in addition can cause the dry additives to cake as well.
The object of the invention is to provide a process for the conditioning of flue gases polluted with solids, particularly from incinerating plants, for subsequent flue gas purification, which process will avoid the observed obstructions especially in the flue gas purification with dry additives, and still to ensure good and even conditioning which can be readily controlled.
This problem can be solved surprisingly well by spraying the water into the gas stream through a preceding spray drying installation, preferably having a rotating atomizer.
To date, spray drying installations have been used uniquely to dry solutions or dispersions of solids. Spray drying is a relatively tedious but gentle drying method and therefore is used primarily to dry temperature sensitive solids of high quality.
In addition, spray drying installations have also been used already for quasi-dry flue gas purification by spraying solutions or dispersions of absorbing agents with water. At the end of the spray tower, a newly dried absorbing agent was then separated which additionally contains the impurities of the flue gas that are to be removed. However, spray drying installations have not been used to date to condition flue gases, because the require-ments with respect to instruments and process engineering seemed much too high. Surprisingly, it has now been found, however, that sticking and caking can be avoided with flue gases polluted with solids, particularly from incinerating plants, while still allow-ing a perfect, reproducable conditioning which can be readily controlled.
The subsequent flue gas purification can then be performed, for instance, by spraying in dry additives. In particular, alkali metal and alcaline earth metal hydroxides can be considered for the purification of flue gas. However, other absorbing agents, especially active charcoal, can be used as well as dry additives.
2l~l3n2 In principle, it is also possible, of course, to condition flue gases polluted with solids, particularly from incinerating plants, according to the invention and then to add dry additives thereto and optionally to further subject them to wet purifica-tion. Thereby it is possible to separate the solids of the flue gas from the flue gas in a dry form.
In case of spray drying installations, in principle all spray drying installations can be used that are conventionally used for spray drying and especially for flue gas purification. Prefera-bly, spray drying installations with rotating atomizers are employed, since they allow for a particularly good and even distribution of the liquid phase in the gas stream.
Spray drying installations with rotating spray atomizers have originally been developed for the recovery of milk powder, but are employed to a considerable extent for quasi-dry flue gas purification as well. With flue gases polluted with solids, particularly from incinerating plants, however, this method can lead to obstructions and unsatisfactory results.
Hence, an object of the present invention is first a process for the conditioning of flue gases polluted with solids, particularly from incinerating plants, for subsequent flue gas purification, preferably with dry additives, by spraying water into the gas stream, characterized in that the water is sprayed into the gas stream through a preceding spray drying installation, preferably having a rotating atomizer. A further object of the invention is the use of spray drying installations for the conditioning of flue gases polluted with solids, particularly from incinerating plants, for subsequent flue gas purification, preferably with dry additives, by spraying water into the gas stream.
Preferably, spray drying installations with rotating atomizers are employed.
~ 21~1302 The subsequent flue gas purification, for instance by blowing in dry alkali metal and alcaline earth metal hydroxides, is rendered substantially more reliable and efficient according to the invention.
The seemingly excessively high requirements of a spray drying installation with respect to instruments and process engineering just for the conditioning of the flue gases eventually leads to such improved results, however, that the overall plant works better and more economically.
A critical advantage is the improved security of the process, for it works in a more flexible way when more or less water is required or when more or less water is supplied. There is no sudden break but rather a slow increasing or decreasing of the amount of water supplied which is introduced in the flue gas.
Therefore, it is also easier for the process to be controlled.
Spray lances tend to get obstructed and thereby to suddenly interrupt the water supply. This results in severe obstructions of the process.
A typical spray drying installation which can also be used for abrasive aqueous liquids is described in U.S. Patent 4,530,822 and is sold, for instance, by the firm of NIRO. These installa-tions can be used for the present invention as well.
A Process for the Conditioning of Flue Gases The object of the present invention is a process for the con-ditioning of flue gases polluted with solids, particularly from incinerating plants, for subsequent flue gas purification, preferably with dry additives, by spraying water into the gas stream.
For the purification of flue gases, it is necessary in general to condition the flue gas in terms of temperature and steam con-tent. In wet flue gas purification processes, for instance, this conditioning takes place in a quencher. For the purification of flue gases with dry additives, water is conventionally sprayed into the flue gas stream by means of spray lances. Subsequent ~lue gas purification with dry additives then causes elimination of acidic components, such as HCl, HF, SO2, and NOx. If the flue gases are polluted by solids, the latter are considerably en-riched in the quencher and thus channeled out of the process. In the flue gas purification with dry additives, the solid impur-ities are channeled out of the process and hence removed from the flue gas along with the dry additives. If the flue gases are conditioned by spraying in water by means of spray lances, high solids pollutions result in undesirable and obtrusive sticking and caking which may also interfere with the subsequent purifica-tion with dry additives. Such sticking and caking is observed in particular in cases when spraying of the water is done in an uneven manner and larger droplets get into the flue gas stream as well in addition to fine mists.
Unsufficient conditioning of the flue gases will result in un-sufficient purification. Overdosing of the water will result in sticking and caking of the solids present in the flue gas and in addition can cause the dry additives to cake as well.
The object of the invention is to provide a process for the conditioning of flue gases polluted with solids, particularly from incinerating plants, for subsequent flue gas purification, which process will avoid the observed obstructions especially in the flue gas purification with dry additives, and still to ensure good and even conditioning which can be readily controlled.
This problem can be solved surprisingly well by spraying the water into the gas stream through a preceding spray drying installation, preferably having a rotating atomizer.
To date, spray drying installations have been used uniquely to dry solutions or dispersions of solids. Spray drying is a relatively tedious but gentle drying method and therefore is used primarily to dry temperature sensitive solids of high quality.
In addition, spray drying installations have also been used already for quasi-dry flue gas purification by spraying solutions or dispersions of absorbing agents with water. At the end of the spray tower, a newly dried absorbing agent was then separated which additionally contains the impurities of the flue gas that are to be removed. However, spray drying installations have not been used to date to condition flue gases, because the require-ments with respect to instruments and process engineering seemed much too high. Surprisingly, it has now been found, however, that sticking and caking can be avoided with flue gases polluted with solids, particularly from incinerating plants, while still allow-ing a perfect, reproducable conditioning which can be readily controlled.
The subsequent flue gas purification can then be performed, for instance, by spraying in dry additives. In particular, alkali metal and alcaline earth metal hydroxides can be considered for the purification of flue gas. However, other absorbing agents, especially active charcoal, can be used as well as dry additives.
2l~l3n2 In principle, it is also possible, of course, to condition flue gases polluted with solids, particularly from incinerating plants, according to the invention and then to add dry additives thereto and optionally to further subject them to wet purifica-tion. Thereby it is possible to separate the solids of the flue gas from the flue gas in a dry form.
In case of spray drying installations, in principle all spray drying installations can be used that are conventionally used for spray drying and especially for flue gas purification. Prefera-bly, spray drying installations with rotating atomizers are employed, since they allow for a particularly good and even distribution of the liquid phase in the gas stream.
Spray drying installations with rotating spray atomizers have originally been developed for the recovery of milk powder, but are employed to a considerable extent for quasi-dry flue gas purification as well. With flue gases polluted with solids, particularly from incinerating plants, however, this method can lead to obstructions and unsatisfactory results.
Hence, an object of the present invention is first a process for the conditioning of flue gases polluted with solids, particularly from incinerating plants, for subsequent flue gas purification, preferably with dry additives, by spraying water into the gas stream, characterized in that the water is sprayed into the gas stream through a preceding spray drying installation, preferably having a rotating atomizer. A further object of the invention is the use of spray drying installations for the conditioning of flue gases polluted with solids, particularly from incinerating plants, for subsequent flue gas purification, preferably with dry additives, by spraying water into the gas stream.
Preferably, spray drying installations with rotating atomizers are employed.
~ 21~1302 The subsequent flue gas purification, for instance by blowing in dry alkali metal and alcaline earth metal hydroxides, is rendered substantially more reliable and efficient according to the invention.
The seemingly excessively high requirements of a spray drying installation with respect to instruments and process engineering just for the conditioning of the flue gases eventually leads to such improved results, however, that the overall plant works better and more economically.
A critical advantage is the improved security of the process, for it works in a more flexible way when more or less water is required or when more or less water is supplied. There is no sudden break but rather a slow increasing or decreasing of the amount of water supplied which is introduced in the flue gas.
Therefore, it is also easier for the process to be controlled.
Spray lances tend to get obstructed and thereby to suddenly interrupt the water supply. This results in severe obstructions of the process.
A typical spray drying installation which can also be used for abrasive aqueous liquids is described in U.S. Patent 4,530,822 and is sold, for instance, by the firm of NIRO. These installa-tions can be used for the present invention as well.
Claims (2)
1. A process for the conditioning of flue gases from inciner-ating plants polluted with solids for subsequent flue gas purification with dry additives by spraying water into the gas stream, characterized in that said water is sprayed into the gas stream through a spray drying installation having a rotating atomizer.
2. The use of spray drying installations having a rotating atomizer for the conditioning of flue gases from incinerat-ing plants polluted with solids for subsequent flue gas purification with dry additives, for spraying water into the gas stream.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4225739A DE4225739A1 (en) | 1992-08-04 | 1992-08-04 | Process for conditioning flue gases |
| DEP4225739.5 | 1992-08-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2141302A1 true CA2141302A1 (en) | 1994-02-17 |
Family
ID=6464806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002141302A Abandoned CA2141302A1 (en) | 1992-08-04 | 1993-07-28 | A process for the conditioning of flue gases |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0653955B1 (en) |
| JP (1) | JPH07509402A (en) |
| KR (1) | KR100200316B1 (en) |
| AT (1) | ATE134153T1 (en) |
| CA (1) | CA2141302A1 (en) |
| DE (2) | DE4225739A1 (en) |
| ES (1) | ES2085167T3 (en) |
| WO (1) | WO1994003261A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL300960A1 (en) * | 1993-11-05 | 1995-05-15 | Roger Leloup | Combustion gas treating apparatus in particular for removing sulphur and nitrogen oxides therefrom |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3842615A (en) * | 1972-11-06 | 1974-10-22 | Standard Havens | Evaporative cooler |
| EP0049585B1 (en) * | 1980-10-03 | 1985-09-04 | Dresser U.K. Limited | Method and apparatus for treating, particularly desulphurising, a polluted gas |
| NL8203455A (en) * | 1982-09-03 | 1984-04-02 | Seac Int Bv | METHOD OF CONDITIONING A GAS STREAM LOADED WITH SOLID PARTICLES AND / OR VAPORS |
| DE3719284A1 (en) * | 1986-10-08 | 1988-04-21 | Krc Umwelttechnik Gmbh | METHOD FOR THE DISPOSAL OF WET FLUE GAS DESULFURATION PLANTS |
| DE3732353A1 (en) * | 1987-09-25 | 1989-04-06 | Metallgesellschaft Ag | METHOD AND DEVICE FOR SEPARATING GASEOUS POLLUTANTS FROM EXHAUST GASES |
| JP2844231B2 (en) * | 1989-12-06 | 1999-01-06 | 株式会社小森コーポレーション | Plate holding device for printing press |
| JP2844539B2 (en) * | 1989-12-15 | 1999-01-06 | 株式会社小森コーポレーション | Plate holding device for printing press |
-
1992
- 1992-08-04 DE DE4225739A patent/DE4225739A1/en not_active Ceased
-
1993
- 1993-07-28 KR KR1019950700410A patent/KR100200316B1/en not_active IP Right Cessation
- 1993-07-28 ES ES93917666T patent/ES2085167T3/en not_active Expired - Lifetime
- 1993-07-28 AT AT93917666T patent/ATE134153T1/en not_active IP Right Cessation
- 1993-07-28 WO PCT/EP1993/001998 patent/WO1994003261A1/en active IP Right Grant
- 1993-07-28 EP EP93917666A patent/EP0653955B1/en not_active Expired - Lifetime
- 1993-07-28 CA CA002141302A patent/CA2141302A1/en not_active Abandoned
- 1993-07-28 DE DE59301649T patent/DE59301649D1/en not_active Expired - Fee Related
- 1993-07-28 JP JP6504968A patent/JPH07509402A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE59301649D1 (en) | 1996-03-28 |
| DE4225739A1 (en) | 1994-02-10 |
| KR950702861A (en) | 1995-08-23 |
| ES2085167T3 (en) | 1996-05-16 |
| KR100200316B1 (en) | 1999-06-15 |
| ATE134153T1 (en) | 1996-02-15 |
| JPH07509402A (en) | 1995-10-19 |
| WO1994003261A1 (en) | 1994-02-17 |
| EP0653955A1 (en) | 1995-05-24 |
| EP0653955B1 (en) | 1996-02-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |