CN101928024A - Method and device for reducing waste gas emission in carnallite dehydrating process - Google Patents
Method and device for reducing waste gas emission in carnallite dehydrating process Download PDFInfo
- Publication number
- CN101928024A CN101928024A CN2009103037149A CN200910303714A CN101928024A CN 101928024 A CN101928024 A CN 101928024A CN 2009103037149 A CN2009103037149 A CN 2009103037149A CN 200910303714 A CN200910303714 A CN 200910303714A CN 101928024 A CN101928024 A CN 101928024A
- Authority
- CN
- China
- Prior art keywords
- waste gas
- carnallite
- gas emission
- chlorinator
- purification system
- 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
- 239000002912 waste gas Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 46
- PALNZFJYSCMLBK-UHFFFAOYSA-K magnesium;potassium;trichloride;hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-].[Cl-].[K+] PALNZFJYSCMLBK-UHFFFAOYSA-K 0.000 title claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 31
- 230000018044 dehydration Effects 0.000 claims abstract description 20
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 20
- 238000000746 purification Methods 0.000 claims abstract description 20
- 239000010881 fly ash Substances 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- 239000003546 flue gas Substances 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 abstract description 5
- 239000000446 fuel Substances 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 abstract description 4
- 239000000779 smoke Substances 0.000 abstract description 2
- 208000005156 Dehydration Diseases 0.000 abstract 5
- 238000010438 heat treatment Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 8
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 8
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000000460 chlorine Substances 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000005868 electrolysis reaction Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The invention discloses a method and a device for reducing waste gas emission in a carnallite dehydrating process. In the method, waste gas generated by a secondary dehydration device is totally used as air required for burning fuel of a primary dehydration device and low-temperature gas required for regulating smoke temperature, and is delivered to the primary dehydration device, and a purification system is only arranged at the waste gas emission port of the primary dehydration device. The device is connected with the front end and the rear end of a heating furnace (4) at the waste gas emission port of a chlorinator (5) through a draft fan (6) and a blower (7) respectively in turn. Compared with the prior art, the method can meet the waste gas emission standard only by arranging a purification system at the waste gas emission port of the primary dehydration device, so that a purification system can be saved, the equipment investment can be saved, and the operation cost of the equipment can be reduced because the waste gas purification system also requires consuming alkaline liquid as a cleaning solution in daily running.
Description
Technical field
The present invention relates to the method and the device of a kind of exhaust gas purifying method and device, particularly a kind of reducing waste gas emission in carnallite dehydrating process.
Background technology
Producing with the Carnalite dehydration electrolysis in the technological process of MAGNESIUM METAL, the carnallitite that needs to contain a small amount of attached water and 6 crystal water makes the anhydrous carnallite melt through twice dehydration, makes MAGNESIUM METAL through electrolysis again.And carnallitite in dehydration in the exhaust gas discharged content of HCl can not satisfy environmental requirement, therefore need carry out purifying treatment to exhaust gas discharged.
Existing Carnalite dehydration flow process is respectively to be provided with a cover waste gas cleaning system after the dewatering unit in the first time dewatering unit and the second time, has not only increased facility investment, has also increased the equipment working cost.
Summary of the invention
The objective of the invention is to, a kind of method and device of reducing waste gas emission in carnallite dehydrating process is provided.This method can satisfy under the prerequisite of waste gas emission standard, reduces discharge amount of exhaust gas and saves a cover waste gas cleaning system, can save facility investment, reduces the equipment working cost.
Technical scheme of the present invention: a kind of method of reducing waste gas emission in carnallite dehydrating process, be that waste gas that the second dehydration device is produced is all as the required air of primary dewatering device burning with regulate the required cryogenic gas of flue-gas temperature, and deliver to the primary dewatering device, only the Waste gas outlet at the primary dewatering device is provided with a cover purification system.
In the method for above-mentioned reducing waste gas emission in carnallite dehydrating process, described primary dewatering device adopts fluidizing furnace, and the second dehydration device adopts chlorinator.
In the method for aforesaid reducing waste gas emission in carnallite dehydrating process, the waste gas that described chlorinator produces is delivered to the front-end and back-end of hotblast stove through induced draft fan, valve, gas blower.
Implement the used device of method that aforementioned carnallitite dewatering process flow reduces discharge amount of exhaust gas, its formation comprises fluidizing furnace, the Waste gas outlet of fluidizing furnace is connected with purification system through fly-ash separator, the hot blast input aperture of fluidizing furnace is provided with hotblast stove, and the material delivery port of fluidizing furnace is connected with the charging opening of chlorinator through pipeline; The Waste gas outlet of chlorinator is connected with the front-end and back-end of hotblast stove respectively with gas blower through induced draft fan successively.
In the device of above-mentioned reducing waste gas emission in carnallite dehydrating process, be provided with valve between described induced draft fan and the gas blower.
Compared with prior art, because the waste gas that the present invention produces the second dehydration device is all as the required air of the fuel combustion of primary dewatering device with regulate the required cryogenic gas of flue-gas temperature and deliver to the primary dewatering device, so can cancel a cover purification system of second dehydration device Waste gas outlet, a cover purification system only need be set at the Waste gas outlet of primary dewatering device can satisfy waste gas emission standard.Saved a cover waste gas cleaning system, can save facility investment, when day-to-day operation owing to waste gas cleaning system also needs to consume alkaline liquid as washings, so also reduced the running cost of equipment.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the prior art constructions synoptic diagram.
Being labeled as in the accompanying drawing: 1-fluidizing furnace, 2-fly-ash separator, 3-purification system, 4-hotblast stove, 5-chlorinator, 6-induced draft fan, 7-gas blower, 8-valve.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples, but not as the foundation of the present invention being done any restriction.
Embodiment.Existing Carnalite dehydration refining plant as shown in Figure 2.Its formation comprises fluidizing furnace 1, and the Waste gas outlet of fluidizing furnace 1 is connected with purification system 3 through fly-ash separator 2, and the hot blast input aperture of fluidizing furnace 1 is provided with hotblast stove 4, and the material delivery port of fluidizing furnace 1 is through warehouse and carry facility to be connected with the charging opening of chlorinator 5; The Waste gas outlet of chlorinator 5 is connected with another purification system 3.Can see by Fig. 2, use two cover purification systems 3 in the prior art, facility investment height, equipment running cost height.
The method of a kind of reducing waste gas emission in carnallite dehydrating process of the present invention and device are as shown in Figure 1, its method be waste gas that chlorinator is produced all as the first time dewatering unit the required air of fuel combustion and regulate the required cryogenic gas of flue-gas temperature and deliver to fluidizing furnace, only the Waste gas outlet at fluidizing furnace is provided with a cover purification system.Specific practice is the front-end and back-end that the waste gas that chlorinator produces are returned to fluidizing furnace input terminus hotblast stove through induced draft fan, valve, gas blower respectively.
Implement the used device of method of aforesaid reducing waste gas emission in carnallite dehydrating process, its formation comprises fluidizing furnace 1, the Waste gas outlet of fluidizing furnace 1 is connected with purification system 3 through fly-ash separator 2, fly-ash separator 2 is sent into purification system 3 after removing most of carnallitite dust in the tail gas, in purification system 3, wash chlorine and hydrogenchloride and the remaining a little light halogen stone flour dirt that absorbs in the tail gas through three grades of absorption towers with alkaline liquid, satisfy the tail gas of emission request after the purification and send into smoke stack emission, all use pipe connection between each equipment through induced draft fan.The hot blast input aperture of fluidizing furnace 1 is provided with hotblast stove 4, and the Waste gas outlet of chlorinator 5 is connected 4 with the front-end and back-end of process furnace 4 through induced draft fan 6 respectively with gas blower 7 successively.Be provided with valve 8 between described induced draft fan 6 and the gas blower 7.The tolerance that gas blower 7 required tolerance are provided greater than induced draft fan 6, insufficient section tolerance is replenished by the suction opening that pipeline enters gas blower 7 through valve 8 by atmosphere.
Working process of the present invention or principle
The Carnalite dehydration flow process comprises the primary dewatering and the second dehydration process of carnallitite.
The primary dewatering of carnallitite is exactly that the carnallitite that contains a small amount of attached water and 6 crystal water is sent in the fluidizing furnace, and feeds the hot blast that produces with hotblast stove and carry out the fluidization thermal dehydration, removes attached water and most crystal water, that is:
KCl.MgCl
2·6H
2O→KCl.MgCl.4H
2O+2H
2O↑
KCl.MgCl
2·4H
2O→KCl.MgCl.2H
2O+2H
2O↑
KCl.MgCl
2·2H
2O→KCl.MgCl+2H
2O↑
In this process, have a spot of carnallitite generation hydrolysis reaction simultaneously, generate MgOHCl or MgO and HCl gas, its reaction formula is:
KCl.MgCl
2·2H
2O→KCl.MgOHCl+H
2O↑+HCl↑
KCl.MgOHCl→KCl+MgO+HCl↑
Therefore, contain the composition of HCl from the tail gas that fluidizing furnace is discharged, tail gas must absorb with the alkaline liquid washing in the absorption tower after gathering dust, and makes the content of HCl in the discharging tail gas satisfy environmental requirement.
The second dehydration of carnallitite is exactly to allocate the primary dewatering material that makes through primary dewatering into a certain amount of carbon dust to add in the chlorinator, become molten state through electrically heated, simultaneously in the carnallitite melt, feed chlorine, make carnallitite further remove remaining moisture, make KCl.MgOHCl and MgO in the carnallitite melt change MgCl into simultaneously
2, its reaction formula is:
4KCl.MgOHCl+C+2Cl
2→4KCl.MgCl
2+CO
2↑+2H
2O↑
2MgO+C+2Cl
2→2MgCl
2+CO
2↑
The anhydrous carnallite melt that makes is sent to electrolysis and is produced MAGNESIUM METAL.From the waste gas that chlorinator is discharged, be mainly air, and contain a spot of CO
2, water vapour and participate in the Cl of reaction
2, the waste gas that chlorinator is produced is all as the required air of the fuel combustion of hotblast stove 4 with regulate the required cryogenic gas of flue-gas temperature and deliver to fluidizing furnace 1, so can be only at the Waste gas outlet of fluidizing furnace one cover purification system be set, makes Cl in the discharging waste gas
2Satisfy environmental requirement with the content of HCl.Specific practice is the waste gas that chlorinator produces to be delivered to the front-end and back-end of fluidizing furnace hot blast input terminus hotblast stove respectively through induced draft fan, valve, gas blower.
Claims (5)
1. the method for a reducing waste gas emission in carnallite dehydrating process, it is characterized in that: this method is that waste gas that the second dehydration device is produced is all as the required air of primary dewatering device burning with regulate the required cryogenic gas of flue-gas temperature, and deliver to the primary dewatering device, only the Waste gas outlet at the primary dewatering device is provided with a cover purification system.
2. the method for reducing waste gas emission in carnallite dehydrating process according to claim 1 is characterized in that: described primary dewatering device employing fluidizing furnace, second dehydration device employing chlorinator.
3. the method for reducing waste gas emission in carnallite dehydrating process according to claim 2 is characterized in that: the waste gas that described chlorinator produces is delivered to the front-end and back-end of hotblast stove respectively through induced draft fan, valve, gas blower.
4. implement the used device of method of the described reducing waste gas emission in carnallite dehydrating process of aforementioned claim 1 to 3, its formation comprises fluidizing furnace (1), the Waste gas outlet of fluidizing furnace (1) is connected with purification system (3) through fly-ash separator (2), the hot blast input aperture of fluidizing furnace (1) is provided with hotblast stove (4), and the material delivery port of fluidizing furnace (1) is through warehouse and carry facility to be connected with the charging opening of chlorinator (5); It is characterized in that: the Waste gas outlet of chlorinator (5) is connected with the front-end and back-end of process furnace (4) respectively with gas blower (7) through induced draft fan (6) successively.
5. the device of reducing waste gas emission in carnallite dehydrating process according to claim 4 is characterized in that: be provided with valve (8) between described induced draft fan (6) and the gas blower (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910303714 CN101928024B (en) | 2009-06-26 | 2009-06-26 | Method and device for reducing waste gas emission in carnallite dehydrating process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910303714 CN101928024B (en) | 2009-06-26 | 2009-06-26 | Method and device for reducing waste gas emission in carnallite dehydrating process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101928024A true CN101928024A (en) | 2010-12-29 |
| CN101928024B CN101928024B (en) | 2013-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910303714 Expired - Fee Related CN101928024B (en) | 2009-06-26 | 2009-06-26 | Method and device for reducing waste gas emission in carnallite dehydrating process |
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| Country | Link |
|---|---|
| CN (1) | CN101928024B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2503618C1 (en) * | 2012-07-06 | 2014-01-10 | Открытое Акционерное Общество "Корпорация Всмпо-Ависма" | Fluid-bed furnace for dehydration of chlorine-magnesium stock |
| RU2763833C1 (en) * | 2021-03-16 | 2022-01-11 | Публичное Акционерное Общество "Корпорация Всмпо-Ависма" | Method for preparation of carnallite for electrolytic production of magnesium and chlorine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2095481C1 (en) * | 1996-02-06 | 1997-11-10 | Акционерное общество открытого типа "Всероссийский алюминиево-магниевый институт" | Method of producing magnesium from sulfate-containing raw material |
| US7503946B2 (en) * | 2002-10-17 | 2009-03-17 | Nippon Chemical Plant Consultant Co., Ltd. | Autooxidation internal heating type steam reforming system |
| CN1926248B (en) * | 2004-02-27 | 2010-04-07 | 技术资源有限公司 | Direct smelting equipment and method |
-
2009
- 2009-06-26 CN CN 200910303714 patent/CN101928024B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2503618C1 (en) * | 2012-07-06 | 2014-01-10 | Открытое Акционерное Общество "Корпорация Всмпо-Ависма" | Fluid-bed furnace for dehydration of chlorine-magnesium stock |
| RU2763833C1 (en) * | 2021-03-16 | 2022-01-11 | Публичное Акционерное Общество "Корпорация Всмпо-Ависма" | Method for preparation of carnallite for electrolytic production of magnesium and chlorine |
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| Publication number | Publication date |
|---|---|
| CN101928024B (en) | 2013-10-30 |
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Free format text: CORRECT: ADDRESS; FROM: 550004 NO. 208, BEIJING ROAD, GUIYANG CITY, GUIZHOU PROVINCE TO: 550081 NO.2, JINZHU ROAD, JINYANG NEW DISTRICT, GUIYANG CITY, GUIZHOU PROVINCE |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20110531 Address after: 550081 Guiyang Province, Jinyang New District, Zhu Zhu Road, No. 2 Applicant after: Guiyang Aluminum & Magnesium Design Institute Co., Ltd. Address before: 550004 No. 208, Beijing Road, Guiyang, Guizhou Applicant before: Guiyang Aluminium and Magnesium Design Inst. |
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