CN101928024B - 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
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- CN101928024B CN101928024B CN 200910303714 CN200910303714A CN101928024B CN 101928024 B CN101928024 B CN 101928024B CN 200910303714 CN200910303714 CN 200910303714 CN 200910303714 A CN200910303714 A CN 200910303714A CN 101928024 B CN101928024 B CN 101928024B
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- waste gas
- chlorinator
- purification system
- gas emission
- fluidizing furnace
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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 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
In the technological process with Carnalite dehydration Electrowinning 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 the content of HCl can not satisfy environmental requirement in the waste gas that carnallitite discharges in dehydration, therefore need to carry out purifying treatment to the waste gas of discharging.
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 object of the invention is to, a kind of method and device of reducing waste gas emission in carnallite dehydrating process is provided.The 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, 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 arranges 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 of aforementioned reducing waste gas emission in carnallite dehydrating process, 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 gas blower with the front-end and back-end of hotblast stove through induced draft fan successively and is connected.
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 to 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, owing to waste gas cleaning system also needs to consume alkaline liquid as washings, so also reduced the running cost of equipment when day-to-day operation.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of prior art.
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 connected with the charging opening of chlorinator 5 through warehouse and conveying facility; The Waste gas outlet of chlorinator 5 is connected with another purification system 3.Can be seen that by Fig. 2 used two cover purification systems 3 in the prior art, facility investment is high, equipment running cost is high.
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 arranges a cover purification system.Specific practice is the front-end and back-end that the waste gas that chlorinator produces are returned to respectively fluidizing furnace input terminus hotblast stove through induced draft fan, valve, gas blower.
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, chlorine and hydrogenchloride and remaining a small amount of carnallitite dust in three grades of absorption towers usefulness alkaline liquid washing absorption tail gas, satisfy the tail gas of emission request after the purification and send into smoke stack emission through induced draft fan, all connect with pipeline between each equipment.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 with gas blower through induced draft fan 6 successively and is connected 4 with the front-end and back-end of process furnace 4 respectively.Be provided with valve 8 between described induced draft fan 6 and the gas blower 7.The tolerance that gas blower 7 required tolerance provide 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 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 passes into 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 simultaneously a small amount of carnallitite generation hydrolysis reaction, 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 be used the alkaline liquid washing absorption in the absorption tower after gathering dust, and makes that the content of HCl satisfies environmental requirement in the emission.
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, pass into chlorine, make carnallitite further remove remaining moisture, make simultaneously KCl.MgOHCl and MgO in the carnallitite melt change MgCl into
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 the Electrowinning MAGNESIUM METAL.From the waste gas that chlorinator is discharged, be mainly air, and contain a small amount 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 respectively the front-end and back-end of fluidizing furnace hot blast input terminus hotblast stove through induced draft fan, valve, gas blower.
Claims (2)
1. the method for a reducing waste gas emission in carnallite dehydrating process is characterized in that: the method is to be mainly air with what the second dehydration device produced, and contains a small amount of CO
2, water vapour and participate in the Cl of reaction
2Waste gas 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 arranges a cover purification system; Described primary dewatering device adopts fluidizing furnace, and the second dehydration device adopts chlorinator; The waste gas that chlorinator produces is delivered to respectively the front-end and back-end of hotblast stove through induced draft fan, valve, gas blower.
2. implement the used device of method of aforementioned reducing waste gas emission in carnallite dehydrating process claimed in claim 1, 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 connected with the charging opening of chlorinator (5) through warehouse and conveying facility; It is characterized in that: the Waste gas outlet of chlorinator (5) is connected 7 through induced draft fan (6) with gas blower successively) respectively the front-end and back-end with hotblast stove (4) be connected; 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 |
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| Publication Number | Publication Date |
|---|---|
| CN101928024A CN101928024A (en) | 2010-12-29 |
| CN101928024B true 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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Families Citing this family (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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1165206A (en) * | 1996-02-06 | 1997-11-19 | 俄罗斯国家铝镁研究所 | Method of producing magnesium from raw material containing sulfates |
| CN1714042A (en) * | 2002-10-17 | 2005-12-28 | 株式会社T.Rad | Autooxidation internal heating type steam reforming system |
| CN1926248A (en) * | 2004-02-27 | 2007-03-07 | 技术资源有限公司 | Direct smelting plant and process |
-
2009
- 2009-06-26 CN CN 200910303714 patent/CN101928024B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1165206A (en) * | 1996-02-06 | 1997-11-19 | 俄罗斯国家铝镁研究所 | Method of producing magnesium from raw material containing sulfates |
| CN1714042A (en) * | 2002-10-17 | 2005-12-28 | 株式会社T.Rad | Autooxidation internal heating type steam reforming system |
| CN1926248A (en) * | 2004-02-27 | 2007-03-07 | 技术资源有限公司 | Direct smelting plant and process |
Non-Patent Citations (1)
| Title |
|---|
| 中国冶金百科全书总编辑委员会《冶金建设》卷编辑委员会 等.镁原料脱水车间设计.《中国冶金百科全书：冶金建设（上）》.1999, * |
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|---|---|
| CN101928024A (en) | 2010-12-29 |
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