CN1213580A - Flue gas desulfurizing tech. and appts. for by-product gypsum - Google Patents
Flue gas desulfurizing tech. and appts. for by-product gypsum Download PDFInfo
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- CN1213580A CN1213580A CN 97108252 CN97108252A CN1213580A CN 1213580 A CN1213580 A CN 1213580A CN 97108252 CN97108252 CN 97108252 CN 97108252 A CN97108252 A CN 97108252A CN 1213580 A CN1213580 A CN 1213580A
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- flue gas
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- gypsum
- desulfurizing tower
- desulfurizing
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Abstract
A desulfurizing technique for fume with the by-product of gypsum includes dusting the fume, bubbling suction and neutralization in desulfurizing tower to remove SO2 from fume, oxidizing with air, reaction on lime hydrate to form gypsum crystal and centrifugal dewatering. Said desulfurizing system is composed of duster, draught fan, oxidizing fan, desulfurizing tower and centrifuger. Its advantages are simple process and apparatus, and high desulfurizing effect.
Description
The invention relates to a flue gas dedusting and desulfurizing technology and a device, in particular to a technology and a device capable of converting flue gas desulfurized into gypsum products.
Currently, the SO removal of flue gas is carried out in foreign countries2The process is almost uniform with a cheap and efficient lime/gypsum method. From the practical operationdata in foreign countries, the highest absorption efficiency can reach 95 percent, and the lowest absorption efficiency is 60 to 70 percent; the domestic desulfurization technology is only simple desulfurization by a lime water method. Compared with the domestic and overseas desulfurization technologies, the method has obvious gap. The foreign complete technology is mature and reliable, has no secondary pollution, can generate a byproduct of gypsum, can offset the operating cost of the device, but the complete technology has extremely high selling price and is difficult to bear by general enterprises (taking a 12.5 ten thousand kilowatts/hour power plant as an example, the desulfurizing complete device has selling price of 3 hundred million yuan RMB); the domestic simple desulfurization technology is only to discharge SO from a chimney2Reduction of SO dissolved in water2And the waste gas is released in a sedimentation tank to generate secondary pollution, so that the method has no substantial desulfurization effect. Although the device is cheap, it has no significance for environmental protection.
The invention aims to overcome the defects of the prior art and provide a method which has simple process and simple and convenient equipment and can effectively remove SO in flue gas2And can convert the gypsum into a gypsum product.
The invention aims to realize the following technical scheme that firstly, dust particles are separated from flue gas through a dust remover, then the flue gas subjected to dust removal enters a desulfurization tower through pressurization of a draught fan, the flue gas is uniformly distributed through perforated plates in the tower and then is bubbled out to be neutralized with absorption liquid in the tower for desulfurization reaction, the flue gas which rises along the tower after leaving a bubble layer is continuously absorbedwith the absorption liquid sprayed in the middle of the tower, and the purified flue gas leaves the desulfurization tower through a gas-liquid separator at the top of the tower and enters a chimney for emission; absorption of SO2The desulfurizing liquid is oxidized with the air blown in from the lower part of the tower bottom and then reacts with slaked lime to form gypsum crystal, and then the gypsum crystal is centrifugally dehydrated to form a gypsum product.
The equipment comprises a dust remover, an induced draft fan, an oxidation fan, a desulfurizing tower, a centrifugal machine and a chimney; the dust remover is connected with the air inlet of the draught fan, the liquid outlet at the lower part of the desulfurizing tower is connected with the centrifugal machine, and the upper part of the desulfurizing tower is connected with the chimney.
The invention absorbs SO by lime water2Then the gypsum is generated by oxidation and calcium hydroxide neutralization and crystallization, and the whole process is very simple. Can effectively remove SO in the flue gas2The flue gas is purified, and the desulfurization efficiency is over 80 percent. The invention adopts cheap Ca (OH)2As a desulfurizer, the absorption liquid adopts a circulation mode, the cost is lower, the desulfurizing tower integrates absorption, oxidation, neutralization and crystallization, the secondary pollution can be thoroughly avoided, the whole set of device is simple and reliable, and the feeding is simple and reliableThe resources are less, the occupied area is less, the operation cost can be balanced against the byproduct gypsum, and the waste water after centrifugation can be used for preparing lime milk in a lime slaking tank. The initial estimation is about 1/10 of the cost of the import complete equipment, thereby greatly reducing the investmentAnd greatly saves foreign exchange, and is suitable for domesticpopularization and application. The invention can be widely applied to the smoke discharge treatment of industrial boilers in thermal power plants, sintering plants, sulfuric acid plants, chemical plants, nonferrous smelting plants, textile plants, paper mills and the like, and has wide application markets.
Description of the drawings:
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a block diagram of the process of the present invention.
Wherein: 1-a dust remover; 2-a draught fan; 3-oxidizing the fan; 4-a desulfurizing tower; 5-a circulating pump;
6-a centrifuge; 7-emulsion pump; 8-emulsion pool; 9-an ash dissolving tank; 10-chimney.
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in figures 1 and 2, the invention is completed by four processes of dedusting, desulfurizing, forming gypsum crystal and centrifugal dewatering.
1, dust removal: firstly, inputting sulfur-containing and dust-containing flue gas into a dust remover 1, and separating dust particles from the flue gas by adopting a dry dust removal mode, such as an electric dust remover, a cyclone dust remover and the like;
2, desulfurization: the flue gas after dust removal enters an induced draft fan 2 to be pressurized, then enters a desulfurizing tower 4, the flue gas is firstly sprayed into absorption liquid, is bubbled out after being uniformly distributed by perforated plates in the tower and can be fully contacted with the absorption liquid in the tower to carry out desulfurization reaction, the flue gas which is separated froma bubble layer and ascends along the tower is continuously neutralized with the absorption liquid sprayed at the middle part of the tower, thus the flue gas is desulfurized and neutralized for multiple times, the rest flue gas is purified, the purified flue gas continuously ascends and is subjected to gas-liquid separation by a gas-liquid separator on the top of the tower, and the gas leaves the desulfurizing tower and enters a chimney connected with the tower to be discharged.
3>Forming gypsum crystals: absorbs SO in the flue gas2The desulfurization liquid is oxidized at the bottom of the desulfurization tower 4 by air sucked by an oxidation fan 3 connected with the lower part of the tower. Then reacts with slaked lime to generate gypsumAnd (4) crystals. The chemical reaction formula is as follows:
4, centrifugal dehydration: the formed gypsum crystal is centrifugally dewatered by a centrifuge 6, and then a gypsum product is formed.
The centrifugal waste water produced by the method can be subjected to lime digestion through an emulsion pump 7 and an emulsion pool 8 to prepare lime milk.
The process equipment adopted by the invention comprises a dust remover 1, an induced draft fan 2, an oxidation fan 3, a desulfurizing tower 4, a centrifuge 6 and a chimney 10. The dust remover 1 is connected with an air inlet of an induced draft fan 2, outlets of the induced draft fan 2 and an oxidation fan 3 are respectively connected with an air inlet of a desulfurizing tower 4, an outlet at the lower part of the desulfurizing tower 4 is connected with a centrifugal machine 6, and the upper part of the desulfurizing tower is connected with a chimney 10.
In order to fully save the cost, the invention arranges a circulatingpump 5 on the outlet pipeline of the desulfurizing tower 4, the pump is connected with a spray pipe arranged on the desulfurizing tower 4, and the flue gas rising in the tower can continuously contact and react with the absorption liquid; the waste water after centrifugal dehydration by the centrifuge 6 flows into an emulsion pool 8, lime milk can be prepared by lime slaking, slaked lime is generated by an ash slaking pool 9, and then the slaked lime is conveyed into the desulfurizing tower 4 again by an emulsion pump 7 to become fresh absorption liquid.
Claims (2)
1. A flue gas desulfurization technology of by-product gypsum is characterized in that:
1, dust removal: the sulfur-containing and dust-containing flue gas enters a dust remover, and dust particles are separated from the flue gas through dry dust removal;
2, desulfurization: the flue gas after dust removal enters a desulfurizing tower after being pressurized by a draught fan, is uniformly distributed by perforated plates in the tower and then is bubbled out, the flue gas is neutralized with absorption liquid in the tower to carry out desulfurization reaction, the flue gas which leaves a bubble layer and rises along the tower continuously reacts with the absorption liquid sprayed in the middle of the tower, and the purified flue gas leaves the desulfurizing tower through a tower top gas-liquid separator and enters a chimney to be discharged.
3>Forming gypsum crystals: absorption of SO2The desulfurization solution is oxidized and re-mixed by air blown into the tower bottom and the lower partThe slaked lime reacts to form gypsum crystals.
4, centrifugal dehydration: the gypsum crystals formed are dewatered by a centrifuge to form a gypsum product.
2. The utility model provides a flue gas desulfurization device of byproduct gypsum, includes dust remover (1), draught fan (2), oxidation fan (3), desulfurizing tower (4), centrifuge (6), its characterized in that: the dust remover (1) is connected with the air inlet of the draught fan (2), the outlets of the draught fan (2) and the oxidation fan (3) are respectively connected with the air inlet of the desulfurizing tower (4), the outlet at the lower part of the desulfurizing tower (4) is connected with the centrifugal machine (6), and the upper part of the desulfurizing tower is connected with the chimney (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97108252 CN1213580A (en) | 1997-10-05 | 1997-10-05 | Flue gas desulfurizing tech. and appts. for by-product gypsum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97108252 CN1213580A (en) | 1997-10-05 | 1997-10-05 | Flue gas desulfurizing tech. and appts. for by-product gypsum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1213580A true CN1213580A (en) | 1999-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97108252 Pending CN1213580A (en) | 1997-10-05 | 1997-10-05 | Flue gas desulfurizing tech. and appts. for by-product gypsum |
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| CN (1) | CN1213580A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102154045A (en) * | 2011-03-04 | 2011-08-17 | 池吉安 | Method for processing low-concentration carbon dioxide in mashgas |
| CN101939080B (en) * | 2007-10-23 | 2014-08-06 | 巴布科克诺尔有限公司 | Installation and method for cleaning flue gases |
| CN104474870A (en) * | 2014-12-08 | 2015-04-01 | 冯学岭 | Novel desulfurization dust remover |
| CN104906942A (en) * | 2015-06-25 | 2015-09-16 | 湖州南浔石淙盛艳丝绸有限公司 | Boiler flue gas desulfurization system |
| CN107200489A (en) * | 2017-06-22 | 2017-09-26 | 合肥通用机械研究院 | A kind of centrifugal production system for separating gypsum |
| CN107921361A (en) * | 2015-08-20 | 2018-04-17 | 通用电器技术有限公司 | Flue gas desulfurization with seawater absorbers combination |
-
1997
- 1997-10-05 CN CN 97108252 patent/CN1213580A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101939080B (en) * | 2007-10-23 | 2014-08-06 | 巴布科克诺尔有限公司 | Installation and method for cleaning flue gases |
| CN102154045A (en) * | 2011-03-04 | 2011-08-17 | 池吉安 | Method for processing low-concentration carbon dioxide in mashgas |
| CN102154045B (en) * | 2011-03-04 | 2013-08-21 | 池吉安 | Method for processing low-concentration carbon dioxide in mashgas |
| CN104474870A (en) * | 2014-12-08 | 2015-04-01 | 冯学岭 | Novel desulfurization dust remover |
| CN104906942A (en) * | 2015-06-25 | 2015-09-16 | 湖州南浔石淙盛艳丝绸有限公司 | Boiler flue gas desulfurization system |
| CN107921361A (en) * | 2015-08-20 | 2018-04-17 | 通用电器技术有限公司 | Flue gas desulfurization with seawater absorbers combination |
| CN107200489A (en) * | 2017-06-22 | 2017-09-26 | 合肥通用机械研究院 | A kind of centrifugal production system for separating gypsum |
| CN107200489B (en) * | 2017-06-22 | 2019-05-28 | 合肥通用机械研究院有限公司 | A kind of centrifugal production system separating gypsum |
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