CN104096473A - Sintering flue gas synchronous desulfuration and denitration method - Google Patents
Sintering flue gas synchronous desulfuration and denitration method Download PDFInfo
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- CN104096473A CN104096473A CN201410352754.3A CN201410352754A CN104096473A CN 104096473 A CN104096473 A CN 104096473A CN 201410352754 A CN201410352754 A CN 201410352754A CN 104096473 A CN104096473 A CN 104096473A
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- fluidized bed
- sinter fume
- flue gas
- recirculating fluidized
- sintering flue
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Abstract
The invention discloses a sintering flue gas synchronous desulfuration and denitration method and aims to solve the problems of high investment, larger occupied area and high running cost in the prior art. The sintering flue gas synchronous desulfuration and denitration method comprises the followings: pyrolusite powder is added into a circulating fluidized bed, and spraying water is injected, sintering flue gas accelerated through an accelerator enters the circulating fluidized bed from the flue gas inlet of the circulating fluidized bed, and the sintering flue gas entering the circulating fluidized bed and the pyrolusite powder are in chemical reaction, so as to remove sulphur and saltpetre in the sintering flue gas. The sintering flue gas synchronous desulfuration and denitration method provided by the invention uses the pyrolusite powder as an absorbent, and uses the circulating fluidized bed as an absorber to remove the sulphur and saltpeter in the sintering flue gas. Since the circulating fluidized bed is used as main equipment, the equipment is simple, the investment is low, the occupied area is small, and the running cost is low; the desulfurization and denitrification byproduct formed in the invention is dry dust and can be developed and used in different places.
Description
Technical field
The present invention relates to a kind of sinter fume synchronized desulfuring and denitrifying method.
Background technology
Common sintering flue gas desulfurization method of denitration is the method for fractional steps, i.e. denitration and desulfurization are implemented step by step, the method that such as SCR denitration is combined with limestone/lime/gypsum wet, the method that SCR denitration is combined with lime recirculating fluidized bed etc.Well-known method of fractional steps investment is large, operating cost is large, it is large to take up an area, and be not suitable for the temperature environment of sinter fume, so some technical staff of this area are devoted to work out sinter fume synchronized desulfuring and denitrifying method, and obtained certain achievement, for example draw together active carbon dry desulfurization method of denitration, wet method pyrolusite pulp coal-fired flue-gas synchronized desulfuring and denitrifying method, liming FeSO
4.7H
2o spray ammonia sinter fume recirculating fluidized bed synchronized desulfuring and denitrifying method.
Active carbon dry desulfurization method of denitration needs dust pelletizing system, ash discharging system, active carbon transportation system, active carbon make-up system, thermal cycle and rich SO
2induction system, flue gas system and ammonia injection system.Utilize the investment of the method desulphurization denitration large, operating cost is high, accessory substance dust cannot recycle.
Wet method pyrolusite pulp coal-fired flue-gas synchronized desulfuring and denitrifying method is owing to adopting the limitation of wet method, the recycling of desulphurization denitration accessory substance resource can only be on the spot, be unfavorable for the recycling of extensive desulphurization denitration accessory substance resource, system cost of investment is high, occupation of land is large, operating cost is high.
Liming FeSO
4.7H
2o spray ammonia sinter fume recirculating fluidized bed synchronized desulfuring and denitrifying method, in order to spray ammonia, need to be established a set of ammonia preparation system.Because ammonia has peculiar smell, poisonous, explosive character, make whole system investment large, and desulphurization denitration accessory substance fail to make full use of, need further exploitation.
Summary of the invention
For the problems referred to above, the invention provides a kind of sinter fume synchronized desulfuring and denitrifying method that reduces investment, floor space and operating cost.
For achieving the above object, sinter fume synchronized desulfuring and denitrifying method of the present invention, described method for adding pyrolusite powder, spraying into water smoke in recirculating fluidized bed, sinter fume after accelerator accelerates enters described recirculating fluidized bed from the flue gas mouth that enters of described recirculating fluidized bed, the sinter fume and the described pyrolusite powder generation chemical reaction that enter described recirculating fluidized bed, remove sulphur and nitre in described sinter fume.
Further, described method also comprises that the described sinter fume to discharging from described recirculating fluidized bed carries out dust removal process, obtain removing sinter fume and dust after sulphur and nitre, 60%～90% described dust is returned to described recirculating fluidized bed, and described dust comprises pyrolusite powder and desulphurization denitration accessory substance.
Further, in described recirculating fluidized bed, the molal quantity of manganese element and the ratio of element sulphur and nitrogen element molal quantity sum are greater than 30, and formula table is shown n (Mn)/(n (S)+n (N)) >30.
Further, the sulphur and the nitre that in described recirculating fluidized bed, remove in described sinter fume are to carry out at the sinter fume temperature of 70 DEG C～80 DEG C.
Further, the air velocity of the sinter fume after accelerator accelerates is 50 meter per second～60 meter per seconds.
Further, described pyrolusite powder is not less than 100 orders
The present invention, taking pyrolusite powder as absorbent, taking recirculating fluidized bed as absorber, removes sulphur and nitre in sinter fume.Because capital equipment of the present invention is recirculating fluidized bed, equipment is simple, so small investment, floor space is few, and operating cost is low.In addition, the desulphurization denitration accessory substance that the present invention forms is dried dust, can develop in strange land.
Brief description of the drawings
Fig. 1 is the recirculating fluidized bed that uses in sinter fume synchronized desulfuring and denitrifying method of the present invention and the structural representation of deduster;
Detailed description of the invention
Below in conjunction with Figure of description, the present invention will be further described.
Sinter fume synchronized desulfuring and denitrifying method of the present invention, taking pyrolusite as absorbent, removes sulphur and nitre in sinter fume taking recirculating fluidized bed as absorber, sulphur refers to sulfur dioxide, and nitre refers to nitrogen oxide.In synchronized desulfuring and denitrifying process, utilize the oxidisability of the manganese dioxide in pyrolusite powder, under the sinter fume temperature environment of 70 DEG C～80 DEG C, sulfur dioxide and nitrogen oxide in sinter fume are oxidized, form manganese sulfate and manganese nitrate, thereby remove sulphur and the nitre in sinter fume.As shown in Figure 1, sinter fume synchronized desulfuring and denitrifying method of the present invention is:
In recirculating fluidized bed 1, add pyrolusite powder from charge door 12, and spray into water smoke in from water jet 11 to recirculating fluidized bed, sinter fume enters recirculating fluidized bed from the flue gas mouth 13 that enters of recirculating fluidized bed after accelerator accelerates, and pyrolusite powder, water smoke and sinter fume mix in recirculating fluidized bed.Wherein pyrolusite powder is ground and forms at the sky of 40% left and right pyrolusite by manganese dioxide content, and the pyrolusite powder grinding is not less than 100 orders.The air velocity of sinter fume after accelerator accelerates is 50 meter per second～60 meter per seconds, has just entered the temperature of sinter fume of recirculating fluidized bed 150 DEG C of left and right, and sinter fume runs into after water smoke, and temperature is reduced to 70 DEG C～80 DEG C.In recirculating fluidized bed, the molal quantity of manganese element and the ratio of element sulphur and nitrogen element molal quantity sum are greater than 30, and formula table is shown n (Mn)/(n (S)+n (N)) >30.
Due to the effect of sinter fume air-flow after accelerating, make sinter fume, water smoke and pyrolusite powder three fierce turbulence occur and mix, three fully contacts generation chemical reaction, form floccule to whereabouts, the floccule falling constantly disintegrates then again by gas lift in fierce turbulence, a small amount of floccule falls into the bottom of recirculating fluidized bed, and the floccule that falls into bottom is discharged to recirculating fluidized bed from ash discharging hole 14, then packaging outward transport.Wherein floccule refers to the desulphurization denitration accessory substance that sinter fume and pyrolusite powder generation chemical reaction form, and includes manganese sulfate and manganese nitrate in desulphurization denitration accessory substance.
The sinter fume of discharging from recirculating fluidized bed is carried out to dust removal process by deduster 2, obtain the sinter fume after dust and desulphurization denitration, sinter fume is discharged from exhaust smoke outlet 22, enter atmosphere.Be pyrolusite powder and desulphurization denitration accessory substance by the dust under removing.The discharge chute 21 that is entered deduster by the dust under removing, returns to 60%～90% dust to recirculating fluidized bed and recycles the pyrolusite powder in dust, and remaining dust is discharged recirculating fluidized bed, then packaging outward transport.Sulfur dioxide the sinter fume of discharging from recirculating fluidized bed by detection and the amount of nitrogen oxide, whether the sulphur and the nitre that judge sinter fume is oxidized completely, if the amount of the sulfur dioxide detecting and nitrogen oxide is higher, increase the amount of the pyrolusite powder adding to recirculating fluidized bed from charging aperture.
It is raw material that the present invention adopts natural pyrolusite, and grinding into and being not less than 100 object pyrolusite powders is absorbent.Natural pyrolusite is abundant in China's wide geographic area reserves, easily buy, and price is lower.The desulphurization denitration accessory substance forming after generation chemical reaction of the present invention contains manganese sulfate and manganese nitrate, so desulphurization denitration accessory substance can be used as the excellent resource of producing manganese sulfate, manganese nitrate and electrolytic manganese, and because the manganese element in desulphurization denitration accessory substance has been reduced to divalence, so the price of desulphurization denitration accessory substance is higher than pyrolusite powder price, thereby income of raising factory.Desulphurization denitration accessory substance of the present invention is dry dust, can pack rear outward transport, and the strange land of realizing desulphurization denitration accessory substance develops.
The present invention compares with active carbon dry desulfurization method of denitration of the prior art, capital equipment of the present invention is recirculating fluidized bed, and active carbon dry desulfurization method of denitration needs dust pelletizing system, ash discharging system, active carbon transportation system, active carbon make-up system, thermal cycle and rich SO
2induction system, flue gas system and ammonia injection system.The present invention does not need ammonia injection system, thus reduced investment of the present invention, take up an area less, operating cost is few.
The present invention is with respect to wet method pyrolusite pulp coal-fired flue-gas synchronized desulfuring and denitrifying method of the prior art, the strange land that the present invention can realize desulphurization denitration accessory substance develops, and the recycling of the desulphurization denitration accessory substance of wet method pyrolusite pulp coal-fired flue-gas synchronized desulfuring and denitrifying method can only be on the spot, be unfavorable for the recycling of extensive desulphurization denitration accessory substance, and wet method pyrolusite pulp coal-fired flue-gas synchronized desulfuring and denitrifying method system cost of investment compared with the present invention is high, occupation of land is many, operating cost is high.
The present invention is with respect to liming FeSO of the prior art
4.7H
2o spray ammonia sinter fume recirculating fluidized bed synchronized desulfuring and denitrifying method, the present invention does not need ammonia preparation system, has reduced investment, floor space and operating cost.
Above; be only preferred embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claim was defined.
Claims (6)
1. a sinter fume synchronized desulfuring and denitrifying method, it is characterized in that: described method for adding pyrolusite powder, spraying into water smoke in recirculating fluidized bed, sinter fume after accelerator accelerates enters described recirculating fluidized bed from the flue gas mouth that enters of described recirculating fluidized bed, the sinter fume and the described pyrolusite powder generation chemical reaction that enter described recirculating fluidized bed, remove sulphur and nitre in described sinter fume.
2. sinter fume synchronized desulfuring and denitrifying method according to claim 1, it is characterized in that: described method also comprises that the described sinter fume to discharging from described recirculating fluidized bed carries out dust removal process, obtain dust and remove the sinter fume after sulphur and nitre, 60%～90% described dust is returned to described recirculating fluidized bed, and described dust comprises pyrolusite powder and desulphurization denitration accessory substance.
3. sinter fume synchronized desulfuring and denitrifying method according to claim 1, it is characterized in that: in described recirculating fluidized bed, the molal quantity of manganese element and the ratio of element sulphur and nitrogen element molal quantity sum are greater than 30, and formula table is shown n (Mn)/(n (S)+n (N)) >30.
4. sinter fume synchronized desulfuring and denitrifying method according to claim 1, is characterized in that: the sulphur and the nitre that in described recirculating fluidized bed, remove in described sinter fume are to carry out at the sinter fume temperature of 70 DEG C～80 DEG C.
5. sinter fume synchronized desulfuring and denitrifying method according to claim 1, is characterized in that: the air velocity of the sinter fume after accelerator accelerates is 50 meter per second～60 meter per seconds.
6. sinter fume synchronized desulfuring and denitrifying method according to claim 1, is characterized in that: described pyrolusite powder is not less than 100 orders.
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Cited By (4)
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|---|---|---|---|---|
| CN105688647A (en) * | 2016-03-16 | 2016-06-22 | 贵州大学 | Method for dry desulfurization and demercuration of sintering flue gas containing mercury by means of low-grade pyrolusite |
| CN106039948A (en) * | 2016-07-25 | 2016-10-26 | 合肥天翔环境工程有限公司 | Boiler smoke chemical-process desulfurization and denitrification agent and preparation method thereof |
| CN106178947A (en) * | 2016-07-25 | 2016-12-07 | 合肥天翔环境工程有限公司 | Smoke denitrifier and preparation method thereof |
| CN109012134A (en) * | 2018-08-31 | 2018-12-18 | 张俊霞 | A kind of device and method removing sulfureous in flue gas oxide using pyrolusite fluidisation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105688647A (en) * | 2016-03-16 | 2016-06-22 | 贵州大学 | Method for dry desulfurization and demercuration of sintering flue gas containing mercury by means of low-grade pyrolusite |
| CN106039948A (en) * | 2016-07-25 | 2016-10-26 | 合肥天翔环境工程有限公司 | Boiler smoke chemical-process desulfurization and denitrification agent and preparation method thereof |
| CN106178947A (en) * | 2016-07-25 | 2016-12-07 | 合肥天翔环境工程有限公司 | Smoke denitrifier and preparation method thereof |
| CN109012134A (en) * | 2018-08-31 | 2018-12-18 | 张俊霞 | A kind of device and method removing sulfureous in flue gas oxide using pyrolusite fluidisation |
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Application publication date: 20141015 |