CN1105900A - Simple dry desulfurizating apparatus - Google Patents
Simple dry desulfurizating apparatus Download PDFInfo
- Publication number
- CN1105900A CN1105900A CN 94117098 CN94117098A CN1105900A CN 1105900 A CN1105900 A CN 1105900A CN 94117098 CN94117098 CN 94117098 CN 94117098 A CN94117098 A CN 94117098A CN 1105900 A CN1105900 A CN 1105900A
- Authority
- CN
- China
- Prior art keywords
- mentioned
- water
- collect plant
- dust collect
- desulfurizating
- 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.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000000428 dust Substances 0.000 claims abstract description 50
- 230000003009 desulfurizing Effects 0.000 claims abstract description 22
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 19
- 239000007921 spray Substances 0.000 claims abstract description 11
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 5
- 238000000889 atomisation Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract 2
- 229910052815 sulfur oxide Inorganic materials 0.000 abstract 1
- 238000011144 upstream manufacturing Methods 0.000 abstract 1
- 239000002351 wastewater Substances 0.000 abstract 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium monoxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 22
- 238000006243 chemical reaction Methods 0.000 description 16
- 235000012255 calcium oxide Nutrition 0.000 description 11
- 239000000292 calcium oxide Substances 0.000 description 11
- 239000002956 ash Substances 0.000 description 9
- 239000002002 slurry Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000005755 formation reaction Methods 0.000 description 7
- 238000005406 washing Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000012492 regenerant Substances 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 230000032258 transport Effects 0.000 description 3
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
Images
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
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- 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
- F23J15/006—Layout of treatment plant
Abstract
To provide a desulfurization apparatus which performs its function efficiently, does not produce waste water to be discharged, and is inexpensive. A desulfurization agent 2 is fed into a boiler 10 to make primary-stage desulfurization take place therein. The apparatus is equipped with a dust collector 20 for removing dust from the gases discharged from the boiler 10, with a water sprinkler 40 for removing sulfur oxides from the gases discharged from the dust collector 20, and with a spray drier 30 which is disposed in the flue between the boiler 10 and the dust collector 20 and sprays in the flue part 43 of the discharged water from the water sprinkler 40. The collected matter 21 at the dust collector 20 may be mixed with part 63 of the discharged water, fed to an upstream point of the spray drier 30, or conveyed to the water sprinkler 40.
Description
The present invention relates to from the exhaust of the burner of sulfur-bearings such as coal combustion, heavy oil (S) fuel, reduce oxysulfide SO
xThe simple dry desulfurizating apparatus of discharging.
The example that desulfur technology is arranged earlier shown in Fig. 5.In Fig. 5, the sulphur in the fuel 1 (S) part is oxysulfide SO in boiler 10
xForm, in boiler 10, carry out following desulfuration in furnace with lime stone 2.
In boiler 10, carry out containing gypsum CaSO in the exhaust behind the desulfuration in furnace
4, ashes etc., but these materials reclaim by dust collect plant 20, handle by other approach.
In addition, owing to also contain unreacted quick lime CaO in the exhaust of boiler 10 outlets,, atomizing drier 30 is set carries out the interior desulfurization of flue in order to reuse its purpose.In atomizing drier 30, spray water 31, to produce following desulphurization reaction.
Gu this reaction is gas/liquid reactions → liquid/reaction,,, adopt bag dust filter mostly as common dust arrester 20 in order to promote this reaction.
As mentioned above, carry out flue desulfurization according to the reaction shown in the above-mentioned reaction equation, but the poor efficiency of gas/liquid reactions wherein.It is influenced by the quality of water spray situation, though be sprayed into goodish vaporific, at H
2O drips and SO
2Gas contact aspect also can be restricted, thereby requirement can be carried out this reaction effectively.
Solve one of countermeasure as it, normally in dust collect plant, used bag dust filter in the past, in case particle stops on filter cloth surface, it just reacts, but, if this mechanical device then passes through can not produce desulfurization performance under the situation of the non-stop dust collect plant of face at gas at this particles such as using electrostatic (electric dust) precipitator EP.
Problem of the present invention provides a kind of above-mentioned shortcoming and desulfurization efficiently that can overcome in the former desulfurizer, again can be with the cheap desulfurizer of no drainage pattern work.
The 1st aspect of the present invention is in order to solve above-mentioned problem, a kind of simple dry desulfurizating apparatus is provided, its constitutive characteristic is, has the combustion furnace that can in stove, drop into desulfurizing agent, thereby make the atomizing drier of its desulfurization to the exhaust water spray that this combustion furnace comes out, and from the gas that this drier is discharged, remove in the simple dry desulfurizating apparatus of dust collect plant of dust, the water dissemination apparatus of above-mentioned dust collect plant exhaust sulphur oxide is removed in setting, by the above-mentioned atomizing drier in the flue that is configured between above-mentioned combustion furnace and the above-mentioned dust collect plant, the part of the draining that will come out from above-mentioned water dissemination apparatus, atomisation in above-mentioned flue.
As this water dissemination apparatus, also can adopt the device of washing type.
According to this desulfurizer, then can be by means of the water dissemination apparatus that is configured in the dust collect plant downstream side with oxysulfide SO
xAlmost all be absorbed in the water, by the atomizing drier spraying in the flue of this draining before dust collect plant made its evaporation then.
So, by containing H
2SO
3(H
2SO
4Solid) spray water and the liquid/reaction of unreacted CaO in the flue, carry out the interior desulfurization of effective flue.
The 2nd aspect of the present invention provides a kind of simple dry desulfurizating apparatus, its formation is, except the desulfurizer of the 1st aspect of the invention described above constitutes, also will be with the part of the draining of coming out from above-mentioned water dissemination apparatus, after the ash mixing that obtains by above-mentioned dust collect plant, with above-mentioned atomizing drier spraying.Ashes that is obtained by dust collect plant and the draining of coming out from the water dissemination apparatus are mixed together and, then it are imported the atomizing drier with pulverizer simultaneously with its pulverizing.This formation can promote desulphurization reaction in the flue that the unreacted CaO from boiler causes.
The 3rd aspect of the present invention provides a kind of simple dry desulfurizating apparatus, its formation is, except the desulfurizer of the invention described above the 1st aspect constitutes, also have the desulfurizing agent sprayer unit that ash that above-mentioned dust collect plant is obtained imports and scatters is set on the flue before above-mentioned atomizing drier.
According to the desulfurizer of this formation, therefore dust-collector and import respectively in the flue before the atomizing drier from the draining of water dissemination apparatus can supply with dust-collector quantity-unlimitingly, carries out sufficient flue desulfurization.
The 4th aspect of the present invention provides a kind of simple dry desulfurizating apparatus, and its formation is that except the desulfurizer formation of the invention described above the 1st aspect, also the ash that above-mentioned dust collect plant is obtained is supplied with above-mentioned water dissemination apparatus.
According to this formation, infeeded the water dissemination apparatus owing to contain the ash of the unreacted CaO that reclaims by dust collect plant, therefore, the pH that flows through the water of water dissemination apparatus rises (acidity weakens) SO
xUptake increases.
In such cases, infeed the water dissemination apparatus after ash can being pulverized, so above-mentioned reaction further improves.
Reaction product (the CaSO that generates in the water dissemination apparatus
4Deng), can be used as slurries in dust collect plant and upper reaches spraying thereof, make it dry, in dust collect plant, only reclaim solid state component.In this slurries sprayer, from the unreacted CaO of boiler and the H in the slurries
2SO
3(H
2SO
4) carry out solid-liquid reaction and desulfurization.
Below specify simple dry desulfurizating apparatus of the present invention in accordance with the embodiments illustrated.
Fig. 1 is the desulfurizer system diagram of expression the present invention the 1st embodiment.
Fig. 2 is the desulfurizer system diagram of expression the present invention the 2nd embodiment.
Fig. 3 is the desulfurizer system diagram of expression the present invention the 3rd embodiment.
Fig. 4 is the desulfurizer system diagram of expression the present invention the 4th embodiment.
Fig. 5 is the system diagram of expression prior art desulfurizer example.
Embodiment 1
At first the 1st embodiment shown in Fig. 1 is described.
In Fig. 1, the sulphur in the fuel 1 (S) is to cause to produce oxysulfide SO in boiler 10
xReason, identical with prior art, in boiler 10, drop into lime stone 2, carry out primary desulfuration in furnace thus.
Contain the gypsum CaSO behind the desulfuration in furnace
4, ash etc. exhaust, import control of dust in the dust collect plant 20.Regenerant 21 is disposed by other approach.
In dust arrester 20 exits, dispose washing type water dissemination apparatus 40, the oxysulfide SO that contains in the exhaust that dust collect plant 20 is come out
xBe absorbed in the water.Infeed water 41 in the water dissemination apparatus 40, and, SO absorbed
xAfter water as (H
2SO
4) be stored in the jar of bottom, wherein a part 42 importing water dissemination apparatus recycle, and other parts 43 import in the atomizing drier 30 of the last flow flue that is in dust collect plant 20.Because water and SO herein
2Therefore the material that gas has reacted is sprayed, and only just can reach flue desulfurization efficiently by spray water and from the reaction of the unreacted CaO of boiler after.
And, residual SO in the atomizing drier herein
2Even have, also can be by the dirty washing type water dissemination apparatus 40 of dust collect plant 20, with most SO
2Be absorbed in the water, from chimney 50, discharge the few Purge gas of oxysulfide.
Embodiment 2
Second embodiment shown in Fig. 2.
Among Fig. 2, the part identical with device shown in Figure 1 is marked with same-sign, comprises following examples, only to describing with Fig. 1 example difference.
The a part 22 usefulness pulverizers 60 of the regenerant of control of dust in the part 43 of reacted draining in the washing type water dissemination apparatus 40 and the dust collect plant 20 are mixed, pulverize, import in the atomizing driers 30 as slurries 61 and spray.So, present from the teeth outwards owing to pulverizing from the unreacted CaO of boiler, thereby promoted reaction.
Embodiment 3
Fig. 3 illustrates the 3rd embodiment.
In the embodiment of Fig. 2,, adopt the method for slurries 61 sprayings of in flue, case of wet attrition being crossed, and in the present embodiment shown in Fig. 3, be the mode of using the unreacted CaO of dry type pulverizing effectively in order to use unreacted CaO effectively.
Just, the part 43 of the draining of washing type water dissemination apparatus 40 is directly sprayed by atomizing drier 30 at the upper reaches of dust collect plant 20, regenerant 22 from dust collect plant 20,,, after pulverizer 70 is pulverized, carry out air-flow and transport as driving gas with exhaust 23.Air-flow transports gas 71 and imports and be configured on the atomizing drier 30 of front in the desulfurizing agent sprayer unit 80 in the flow flue.
The advantage of present embodiment is, liquid and solid scatter in other flue, and therefore, the amount of control of dust thing 71 is unrestricted.
Different therewith, as former example, mix simultaneously under the situation of spraying as slurries the back, owing to conveying characteristic is subjected to the restriction of slurry viscosity, solid content just can not use more than ormal weight.
Embodiment 4
Fig. 4 illustrates the 4th embodiment of the present invention.
In this embodiment, the ash that dust collect plant 20 reclaims is supplied with water dissemination apparatus 40, thereby promote desulfurized effect herein more.
The part 22 of the regenerant that is obtained by dust collect plant 20 is imported into water dissemination apparatus 40.Absorb SO in the water dissemination apparatus 40
xAfter water contain H
2SO
3(H
2SO
4), it is stored in the jar of bottom, wherein a part of 42 water supply dissemination apparatus 40 recycle, and remainder 43 is same with preceding embodiment, imports the atomizing drier 30 that is in dust collect plant 20 upper reaches.Because water and SO herein
2Therefore the material that gas has reacted is sprayed, and only just can reach flue desulfurization efficiently by spray water and from the reaction of the unreacted CaO of boiler after.
And, even in the atomizing drier 30 herein residual SO is arranged
2, also can be by the dirty washing type water dissemination apparatus 40 of dust collect plant 20, with most SO
2Be absorbed in the water, from chimney 50, discharge oxysulfide SO
xFew Purge gas.
Infeed the regenerant 22 of the dust collect plant 20 in the water dissemination apparatus 40, increase SO especially in hope
2Under the situation of uptake, resupply after available pulverizer 60 is pulverized, the water pH that flows through water dissemination apparatus 40 is risen (acidity dies down) thus have SO
2The effect that uptake increases.
More than be to specify the present invention in accordance with the embodiments illustrated, but the present invention is not limited to these embodiment, in the shown scope of the invention of claim scope, can also does various changes.
Specify as above,, then can apply flexibly desulfurizing agent effectively, thereby can provide a kind of equipment cost and operating cost all cheap high-efficiency desulfurization device according to the present invention.
Each symbol in the accompanying drawing below is described.
1 fuel, 2 lime stones, 10 boilers, 20 dust collect plants, 23 exhausts, 30 atomizing driers, 40 washing type water dissemination apparatus, 50 chimneys, 60,70 pulverizers, 41,42,43 water, 21,22,71 regenerants (control of dust thing), 61 slurries, 71 air-flows transport gas, 80 desulfurizing agent sprayer units.
Claims (4)
1, simple dry desulfurizating apparatus, its constitutive characteristic is, has the combustion furnace that can in stove, drop into desulfurizing agent, thereby make the atomizing drier of its desulfurization to the exhaust water spray that this combustion furnace comes out, and from the gas that this drier is discharged, remove in the simple dry desulfurizating apparatus of dust collect plant of dust, the water dissemination apparatus of above-mentioned dust collect plant exhaust sulphur oxide is removed in setting, by the above-mentioned atomizing drier in the flue that is configured between above-mentioned combustion furnace and the above-mentioned dust collect plant, the part of the draining that will come out from above-mentioned water dissemination apparatus, atomisation in above-mentioned flue.
2, simple dry desulfurizating apparatus according to claim 1, its constitutive characteristic be, the part of the draining that above-mentioned water dissemination apparatus is come out and mix by the ash content that above-mentioned dust collect plant obtains after again by above-mentioned atomizing drier spraying.
3, simple dry desulfurizating apparatus according to claim 1, its constitutive characteristic be, the ash content that above-mentioned dust collect plant is obtained imports and make the desulfurizing agent sprayer unit of its distribution, is arranged in the flue of above-mentioned atomizing drier front.
4, simple dry desulfurizating apparatus according to claim 1 is characterized in that, the ash content that above-mentioned dust collect plant obtains is supplied with in the above-mentioned water dissemination apparatus.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5255746A JPH07110109A (en) | 1993-10-13 | 1993-10-13 | Dry type simplified desulfurizer |
| JP255746/93 | 1993-10-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1105900A true CN1105900A (en) | 1995-08-02 |
| CN1043128C CN1043128C (en) | 1999-04-28 |
Family
ID=17283060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94117098A Expired - Fee Related CN1043128C (en) | 1993-10-13 | 1994-10-12 | Simple dry desulfurizating apparatus |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPH07110109A (en) |
| CN (1) | CN1043128C (en) |
| AT (1) | AT405249B (en) |
| DE (1) | DE4436660A1 (en) |
| PL (1) | PL176281B1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104736224A (en) * | 2012-12-26 | 2015-06-24 | 三菱日立电力系统株式会社 | Exhaust gas processing device and exhaust gas processing method |
| CN104764032A (en) * | 2007-09-13 | 2015-07-08 | 巴布考克及威尔考克斯公司 | Bottom ash injection for enhancing spray dryer absorber performance |
| CN106914125A (en) * | 2017-05-17 | 2017-07-04 | 莱芜市泰钢工程设计研究有限公司 | Flue gas passes through grinding slag dust-removal and desulfurizing method of denitration and system equipment |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6152053A (en) * | 1999-07-30 | 2000-11-28 | Abb Alstom Power Inc. | Method and assembly for converting waste water accumulated in a fossil fuel-fired power generation system |
| DE50014551D1 (en) * | 2000-09-11 | 2007-09-20 | Thyssenkrupp Xervon Energy Gmb | METHOD FOR CLEANING SMOKE GASES BEHIND FIRE EXTRACTION SYSTEMS |
| JP4920993B2 (en) * | 2005-04-26 | 2012-04-18 | 三菱重工メカトロシステムズ株式会社 | Exhaust gas treatment apparatus and exhaust gas treatment method |
| JP5384799B2 (en) | 2007-03-30 | 2014-01-08 | 三菱重工メカトロシステムズ株式会社 | Exhaust gas treatment apparatus and exhaust gas treatment method |
| JP5835940B2 (en) * | 2011-05-12 | 2015-12-24 | 三菱重工メカトロシステムズ株式会社 | Exhaust gas treatment method and exhaust gas treatment apparatus |
| JP2015037764A (en) * | 2011-12-16 | 2015-02-26 | 日立造船株式会社 | Fly ash circulation exhaust gas treatment method |
| US9352274B2 (en) | 2014-01-02 | 2016-05-31 | Alstom Technology Ltd | Apparatus and method for evaporating waste water and reducing acid gas emissions |
| US9724638B2 (en) | 2014-01-02 | 2017-08-08 | General Electric Technology Gmbh | Apparatus and method for evaporating waste water and reducing acid gas emissions |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4472364A (en) * | 1982-06-23 | 1984-09-18 | Rockwell International Corporation | Process for removal of sulfur oxides from hot gases |
| JPH0638926B2 (en) * | 1986-02-07 | 1994-05-25 | 関西電力株式会社 | Exhaust gas treatment method from coal-fired boiler |
| DK163109C (en) * | 1986-11-17 | 1992-06-15 | Niro Atomizer As | PROCEDURE FOR SUBSTRATING WASTE ABSORPTION TO SULFUR A FLOW OF HEAT ROEGAS |
| JP2740533B2 (en) * | 1989-01-27 | 1998-04-15 | バブコツク日立株式会社 | Wet exhaust gas desulfurization method |
| JP2805497B2 (en) * | 1989-05-11 | 1998-09-30 | 千代田化工建設株式会社 | Treatment of wet flue gas desulfurization wastewater |
| DK165674C (en) * | 1989-07-17 | 1993-05-24 | Niro Atomizer As | PROCEDURE FOR DESULATING HOT ROEGGAS WITH A SUBSTANCE TO THE SULFUR DIOXIDE CONTENTS LOW CONDITIONS OF HYDROGEN CHLORIDE |
| JP2963488B2 (en) * | 1990-04-11 | 1999-10-18 | 電源開発株式会社 | Fluid bed combustion boiler exhaust gas treatment method and apparatus |
| EP0468357B1 (en) * | 1990-07-23 | 1993-11-24 | Mitsubishi Jukogyo Kabushiki Kaisha | Gasifying combustion method and gasifying power generation method |
-
1993
- 1993-10-13 JP JP5255746A patent/JPH07110109A/en active Pending
-
1994
- 1994-10-10 AT AT190794A patent/AT405249B/en not_active IP Right Cessation
- 1994-10-12 CN CN94117098A patent/CN1043128C/en not_active Expired - Fee Related
- 1994-10-12 PL PL94305419A patent/PL176281B1/en not_active IP Right Cessation
- 1994-10-13 DE DE19944436660 patent/DE4436660A1/en not_active Ceased
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764032A (en) * | 2007-09-13 | 2015-07-08 | 巴布考克及威尔考克斯公司 | Bottom ash injection for enhancing spray dryer absorber performance |
| CN104736224A (en) * | 2012-12-26 | 2015-06-24 | 三菱日立电力系统株式会社 | Exhaust gas processing device and exhaust gas processing method |
| US9573095B2 (en) | 2012-12-26 | 2017-02-21 | Mitsubishi Hitachi Power Systems, Ltd. | Flue gas treatment apparatus and flue gas treatment method |
| CN104736224B (en) * | 2012-12-26 | 2017-03-22 | 三菱日立电力系统株式会社 | Exhaust gas processing device and exhaust gas processing method |
| CN106914125A (en) * | 2017-05-17 | 2017-07-04 | 莱芜市泰钢工程设计研究有限公司 | Flue gas passes through grinding slag dust-removal and desulfurizing method of denitration and system equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4436660A1 (en) | 1995-04-20 |
| PL176281B1 (en) | 1999-05-31 |
| CN1043128C (en) | 1999-04-28 |
| PL305419A1 (en) | 1995-04-18 |
| AT405249B (en) | 1999-06-25 |
| JPH07110109A (en) | 1995-04-25 |
| ATA190794A (en) | 1998-11-15 |
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