CN106839794A - A kind of sintering flue gas desulfurization denitration and waste heat recovery integral system and implementation method - Google Patents
A kind of sintering flue gas desulfurization denitration and waste heat recovery integral system and implementation method Download PDFInfo
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- CN106839794A CN106839794A CN201710226842.2A CN201710226842A CN106839794A CN 106839794 A CN106839794 A CN 106839794A CN 201710226842 A CN201710226842 A CN 201710226842A CN 106839794 A CN106839794 A CN 106839794A
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- flue gas
- sintering
- sintering flue
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a kind of sintering flue gas desulfurization denitration and waste heat recovery integral system and implementation method, bellows below sintering machine whole piece sintered production line are divided into three parts by methods described by tandem, before being divided into sintering flue gas, in, three tunnel afterwards, Road sintering flue gas is sequentially sent to central cooler after air blower, dust removing units, selective-catalytic-reduction denitrified unit is heated up respectively, dedusting and denitration, mixing feeding waste heat boiler with way of escape sintering flue gas again through the sintering flue gas after denitration carries out waste heat recovery recycling, mixed sintering flue gas carries out desulfurization through residual heat boiler for exchanging heat cooling Hou Zaiyuqian roads sintering flue gas mixing feeding desulfurization unit, smoke stack emission is sent into by the sintering flue gas after denitration desulfurization through air exhauster again.The present invention can not only reduce investment and the operating cost of sintering flue gas desulfurization denitration, be a kind of sintering flue gas desulfurization denitration innovated very much and waste heat reclaiming process while the waste heat in sintering process production process can be reclaimed.
Description
Technical field
The present invention is to be related to metallurgical industry field, and more particularly to a kind of sintering flue gas desulfurization denitration and waste heat recovery are integrated
System and implementation method.
Background technology
Substantial amounts of atmosphere pollution can be produced in steel art production process, SINTERING PRODUCTION is during modern steel is produced
One of most important technique unit, the NO produced in its sintering processXDischarge capacity accounts for steel plant NOXThe 48% of total release, because
This sintering denitrating flue gas desulfurization has turned into the most important thing of iron and steel enterprise's environmental improvement.At present, external sintering denitrating flue gas skill
Main active charcoal (Jiao) absorption method of art, ciculation fluidized bed process, high-energy radiation-chemical method, semi-dry spraying method and MWROS flue gases are net
Change technology.The investment of the above method and operating cost are very high.Generally using the choosing that technology is highly developed in present coal-burning power plant
The catalytic-reduction denitrified technology of selecting property, i.e. SCR denitration technology, its initial outlay and operating cost are very low, but it requires reaction temperature
It is 260~400 DEG C to spend, and the temperature for sintering flue gas it is relatively low (<200 DEG C), it is difficult to using this ripe SCR
(SCR) denitration technology.
Meanwhile, Steel Industrial is second largest highly energy-consuming, the industry of high pollution for being only second to power industry, wherein sintering
Process energy consumption accounts for the 10%~20% of steel industry total energy consumption, and according to statistics, the residual heat resources amount that production 1t sintering deposits are produced is
1000~1300MJ/t, mostlys come from cooling sintering deposit and sintering flue gas, and residual heat resources are enriched, but conventional sintering machine waste heat is returned
Receipts system, only a small amount of residual heat resources are recycled utilization, and residual heat resources waste serious.
For above-mentioned situation, it is necessary to a kind of sintering flue gas desulfurization denitration and waste heat recovery integral system for sintering machine
And its implementation.
The content of the invention
The technical problem to be solved in the present invention is：A kind of sintering flue gas desulfurization denitration and waste heat recovery integral system are provided
And implementation method, the sintering flue gas containing nitrogen oxides can be heated using the sensible heat for cooling down sintering deposit using the present invention, with full
Smoke reaction temperature requirement in sufficient SCR (SCR) denitration technology, but also reclaimed cooling sintering in central cooler
The sintering fume afterheat produced in sintering process in ore deposit sensible heat and sintering machine, while also reducing the investment of sintering flue gas desulfurization denitration
Cost and operating cost, with good economic benefit and social benefit.
The technical scheme that the present invention solves technical problem is as follows：
A kind of sintering flue gas desulfurization denitration of the present invention and waste heat recovery integral system, the system include that sintering machine, ring are cold
Machine, air blower, dust removing units, selective-catalytic-reduction denitrified unit, waste heat boiler, desulfurization unit, main exhauster, chimney, burning
Knot production line front portion bellows, sintered production line middle part bellows, sintered production line rear portion bellows；The sintering machine respectively with by front and rear
Order be sequentially arranged in below the sintered production line of sintering machine sintered production line front portion bellows, sintered production line middle part bellows,
Sintered production line rear portion bellows are connected；Sintered production line middle part bellows, air blower, central cooler, dust removing units, selectivity
Catalytic-reduction denitrified unit, waste heat boiler, desulfurization unit, main exhauster, chimney are sequentially connected by pipeline；The SINTERING PRODUCTION
The gas outlet of line front portion bellows is connected with the desulfurization unit air inlet；The gas outlet of sintered production line rear portion bellows and institute
State the connection of waste heat boiler air inlet.
Further, sintered production line front portion bellows account for the percentage of all bellows in sintered production line lower section of sintering machine
Than being 10%~20%.
Further, described sintered production line middle part bellows account for the hundred of all bellows in sintered production line lower section of sintering machine
Divide than being 50%~60%.
Further, described sintered production line rear portion bellows account for the hundred of all bellows in sintered production line lower section of sintering machine
Divide than being 10%~30%.
Further, the dust removing units are electric cleaner.
The present invention also provides another technical scheme for solving technical problem：
A kind of sintering flue gas desulfurization denitration of the present invention and the implementation method of waste heat recovery integration, it is characterised in that：To burn
Bellows below knot machine whole piece sintered production line are divided into three parts by tandem, three before, during and after being divided into sintering flue gas
Road, central cooler, dust removing units, selective-catalytic-reduction denitrified unit difference are sequentially sent to by Road sintering flue gas after air blower
Heated up, dedusting and denitration, mix with way of escape sintering flue gas again through the sintering flue gas after denitration more than feeding waste heat boiler carries out
Recuperation of heat is recycled, and mixed sintering flue gas is through the sintering flue gas mixing feeding desulfurization of residual heat boiler for exchanging heat cooling Hou Zaiyuqian roads
Unit carries out desulfurization, and smoke stack emission is sent into through air exhauster again by the sintering flue gas after denitration desulfurization.
Further, the sintering machine whole piece sintered production line lower section is accounted for respectively by the tripartite bellows of tandem
10%~20%, 50%~60% and the 10%~30% of whole bellows percentages.
Further, cooling sintering deposit is placed with the central cooler, the cooling sintering deposit comes from sintering machine.
Further, the temperature of three roads sintering flue gas is respectively 50 DEG C~100 DEG C, 50 DEG C~150 DEG C before, during and after described
With 300 DEG C~500 DEG C.
Further, the mixed flue gas temperature after the cooling through residual heat boiler for exchanging heat is 100 DEG C~200 DEG C.
Compared with prior art, the present invention has advantages below：(1) utilize and cool down sintering mine sensible heat raising sintering flue gas
Temperature, reaches the reaction temperature of selective-catalytic-reduction denitrified unit (SCR) denitration；(2) cooling sintering deposit will be absorbed to show
The high temperature sintering flue gas that sintering flue gas after heat is sent with sintered production line rear portion bellows mixes and residual heat boiler for exchanging heat, waste heat pot
The steam that stove absorbs the heat generation in flue gas is available for steam user to use, and such as generates electricity；(3) without extra consumption resource with regard to energy
Sintering denitrating flue gas desulfurization is completed, while also completing the recycling of residual heat resources；(4) selective-catalytic-reduction denitrified unit
(SCR) investment and operating cost are all very low, with economic benefit and social benefit very high.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention；
In figure：1. sintering machine, 2. central cooler, 3. air blower, 4. dust removing units, 5. selective-catalytic-reduction denitrified unit,
6. waste heat boiler, 7. desulfurization unit, 8. main exhauster, 9. chimney, 10. sintered production line front portion bellows, in 11. sintered production lines
Portion's bellows, 12. sintered production line rear portion bellows.
Specific embodiment
In order to preferably explain the present invention, come in the present invention is furture elucidated with specific embodiment below in conjunction with the accompanying drawings
Hold, but present disclosure is not limited only to following examples.
As shown in figure 1, a kind of sintering flue gas desulfurization denitration of the invention and waste heat recovery integral system, the system is including burning
Knot machine 1, central cooler 2, air blower 3, dust removing units 4, selective-catalytic-reduction denitrified unit 5, waste heat boiler 6, desulfurization unit 7,
Main exhauster 8, chimney 9, sintered production line front portion bellows 10, sintered production line middle part bellows 11, sintered production line rear portion bellows
12；Described sintering machine 1 respectively with sintered production line front portion bellows 10, sintered production line middle part bellows 11, sintered production line after
Portion's bellows 12 are connected；Sintered production line front portion bellows 10, sintered production line middle part bellows 11, sintered production line rear portion wind
Case 12 is sequentially arranged in the lower section of the sintered production line of sintering machine 1 by tandem；Sintered production line middle part bellows 11 go out
Mouth is connected with the air inlet of the air blower 3, and the gas outlet of the air blower 3 is connected with the air inlet of the central cooler 2, the central cooler
2 gas outlets are connected with the air inlet of the dust removing units 4, and the gas outlet of the dust removing units 4 is de- with the SCR
The air inlet of nitre unit 5 is connected, and the gas outlet of selective-catalytic-reduction denitrified unit 5 is connected with the air inlet of the waste heat boiler 6,
The gas outlet of the waste heat boiler 6 is connected with the air inlet of the desulfurization unit 7, the gas outlet of the desulfurization unit 7 with it is described
The air inlet of main exhauster 8 is connected, and the gas outlet of the main exhauster 8 is connected with the chimney 9；Described sintered production line front portion wind
The gas outlet of case 10 is connected with the described air inlet of desulfurization unit 7；The gas outlet of sintered production line rear portion bellows 12 is remaining with described
The air inlet of heat boiler 6 is connected.All bellows below the whole piece sintered production line of sintering machine 1 are divided into three portions by the present embodiment
Point：Sintered production line front portion bellows 10, sintered production line middle part bellows 11, sintered production line rear portion bellows 12, in three part
Each section can be constituted by by multiple bellows.In normal sintering process production process, sintered production line front portion bellows 10
It is 10%~20% to account for the percentage of the whole all bellows in sintered production line bottom, its internal sintering flue-gas temperature for 50 DEG C~
100 DEG C, amount of nitrogen oxides is very low；Sintered production line middle part bellows 11 account for the hundred of the whole all bellows in sintered production line bottom
Divide than being 50%~60%, its internal sintering flue-gas temperature is 50 DEG C~150 DEG C, and amount of nitrogen oxides is very high；SINTERING PRODUCTION
The percentage that line rear portion bellows 12 account for the whole all bellows in sintered production line bottom is 10%~30%, sintering flue gas temperature therein
It is 300 DEG C~500 DEG C to spend, and amount of nitrogen oxides is very low.In the present embodiment, the sintering flue gas in the bellows 11 of sintered production line middle part
The sensible heat absorbed in cooling sintering deposit is introduced into central cooler 2 by air blower 3, and cooling sintering deposit here comes from sintering machine
1, absorb the sintering flue-gas temperature after sensible heat and improve to 300 DEG C~450 DEG C, it is then fed into the dedusting of dust removing units 4, dedusting here
Unit 4 can select electric cleaner, to meet the demand of high temperature sintering flue gas ash removal so that high temperature sintering flue gas is avoided in denitration
Influenceed because flue dust is excessive or damage selective-catalytic-reduction denitrified unit 5, can be with by the sintering flue-gas temperature after dedusting
Meet the requirement of selective-catalytic-reduction denitrified unit 5, sintering flue gas sends into selective-catalytic-reduction denitrified unit 5 and by entering
After row denitration, sintering flue-gas temperature be 300 DEG C~450 DEG C, now sinter flue gas again with sintered production line rear portion bellows 12 in
Common after 300 DEG C~500 DEG C sintering flue gas mixing to enter in waste heat boiler 6, waste heat boiler 6 absorbs the heat in mixed sintering flue gas
Measure and produce steam to be used for steam user, such as generate electricity, mixed sintering flue gas is down to 100 by temperature after waste heat boiler 6
DEG C~200 DEG C after, then with sintered production line front portion bellows 10 in 50 DEG C~100 DEG C sintering flue gas mixing, again mix after
Sintering flue gas feeding desulfurization unit 7 in carry out desulfurization, then by main exhauster 8 feeding chimney 9 in, discharge and meet environmental protection
It is required that flue gas.
The present embodiment also provides the implementation method of a kind of sintering flue gas desulfurization denitration and waste heat recovery integration, by sintering machine
All bellows below whole piece sintered production line are divided into three parts by tandem, three before, during and after being divided into sintering flue gas
Road, central cooler, dust removing units, selective-catalytic-reduction denitrified unit difference are sequentially sent to by Road sintering flue gas after air blower
Heated up, dedusting and denitration, mix with way of escape sintering flue gas again through the sintering flue gas after denitration more than feeding waste heat boiler carries out
Recuperation of heat is recycled, and mixed sintering flue gas is through the sintering flue gas mixing feeding desulfurization of residual heat boiler for exchanging heat cooling Hou Zaiyuqian roads
Unit carries out desulfurization, and smoke stack emission is sent into through air exhauster again by the sintering flue gas after denitration desulfurization.Sintered in this implementation method
Machine whole piece sintered production line lower section by the tripartite bellows of tandem account for respectively whole bellows percentages 10%~
20%th, 50%~60% and 10%~30%；Cooling sintering deposit is placed with the central cooler, the cooling sintering deposit is from sintering
Machine；The temperature of three roads sintering flue gas is respectively 50 DEG C~100 DEG C, 50 DEG C~150 DEG C and 300 DEG C~500 DEG C before, during and after described；
Mixed flue gas temperature after the cooling through residual heat boiler for exchanging heat is 100 DEG C~200 DEG C.
The present invention is utilized in sintering process production process, flue gas nitrogen in the bellows of whole piece sintered production line various location
The difference of oxide content and temperature, while the sintering flue gas of nitrogen-containing oxide is heated using the sensible heat for cooling down sintering deposit, with
Meet the requirement of SCR (SCR) technology flue gas intake air temperature；But also reclaimed in central cooler sintering mine sensible heat and
The sintering fume afterheat produced in sintering process in sintering machine.Therefore, the present invention can not only reduce sintering flue gas desulfurization denitration
Cost of investment, be that a kind of sintering flue gas desulfurization innovated very much takes off while the waste heat in sintering process production process can be reclaimed
Nitre and waste heat reclaiming process.
Claims (10)
1. a kind of sintering flue gas desulfurization denitration and waste heat recovery integral system, it is characterised in that：The system includes sintering machine
(1), central cooler (2), air blower (3), dust removing units (4), selective-catalytic-reduction denitrified unit (5), waste heat boiler (6), de-
Sulphur unit (7), main exhauster (8), chimney (9), sintered production line front portion bellows (10), sintered production line middle part bellows (11),
Sintered production line rear portion bellows (12)；The sintering machine (1) respectively with the sintering that sintering machine (1) is sequentially arranged in by tandem
Sintered production line front portion bellows (10), sintered production line middle part bellows (11) below production line, sintered production line rear portion bellows
(12) it is connected；Sintered production line middle part bellows (11), air blower (3), central cooler (2), dust removing units (4), selectivity
Catalytic-reduction denitrified unit (5), waste heat boiler (6), desulfurization unit (7), main exhauster (8), chimney (9) are connected successively by pipeline
Connect；The gas outlet of sintered production line front portion bellows (10) is connected with the desulfurization unit (7) air inlet；The SINTERING PRODUCTION
The gas outlet at line rear portion bellows (12) is connected with the waste heat boiler (6) air inlet.
2. a kind of sintering flue gas desulfurization denitration and waste heat recovery integral system according to claim 1, it is characterised in that：Institute
State sintered production line front portion bellows (10) account for sintering machine (1) all bellows in sintered production line lower section percentage for 10%~
20%.
3. a kind of sintering flue gas desulfurization denitration and waste heat recovery integral system according to claim 1, it is characterised in that：Institute
Sintered production line middle part bellows (11) stated account for the percentage of all bellows in sintered production line lower section of sintering machine (1) for 50%~
60%.
4. a kind of sintering flue gas desulfurization denitration and waste heat recovery integral system according to claim 1, it is characterised in that：Institute
Sintered production line rear portion bellows (12) stated account for the percentage of all bellows in sintered production line lower section of sintering machine (1) for 10%~
30%.
5. a kind of sintering flue gas desulfurization denitration and waste heat recovery integral system according to claim 1, it is characterised in that：Institute
It is electric cleaner to state dust removing units (4).
6. a kind of sintering flue gas desulfurization denitration and waste heat recovery integration implementation method, it is characterised in that：By sintering machine whole piece
Bellows below sintered production line are divided into three parts by tandem, three tunnels before, during and after being divided into sintering flue gas, by Road
Sintering flue gas be sequentially sent to after air blower central cooler, dust removing units, selective-catalytic-reduction denitrified unit heated up respectively,
Dedusting and denitration, mixs with way of escape sintering flue gas and send into waste heat boiler to carry out waste heat recovery sharp again again through the sintering flue gas after denitration
With mixed sintering flue gas is taken off through residual heat boiler for exchanging heat cooling Hou Zaiyuqian roads sintering flue gas mixing feeding desulfurization unit
Sulphur, smoke stack emission is sent into by the sintering flue gas after denitration desulfurization through air exhauster again.
7. according to claim 6 a kind of sintering flue gas desulfurization denitration and waste heat recovery integration implementation method, its feature
It is：The sintering machine whole piece sintered production line lower section accounts for whole bellows percentages respectively by the tripartite bellows of tandem
10%~20%, 50%~60% and the 10%~30% of ratio.
8. according to claim 6 a kind of sintering flue gas desulfurization denitration and waste heat recovery integration implementation method, its feature
It is：Cooling sintering deposit is placed with the central cooler, the cooling sintering deposit comes from sintering machine.
9. according to claim 6 a kind of sintering flue gas desulfurization denitration and waste heat recovery integration implementation method, its feature
It is：The temperature of three roads sintering flue gas is respectively 50 DEG C~100 DEG C, 50 DEG C~150 DEG C and 300 DEG C~500 before, during and after described
℃。
10. according to claim 6 a kind of sintering flue gas desulfurization denitration and waste heat recovery integration implementation method, its feature
It is：Mixed flue gas temperature after the cooling through residual heat boiler for exchanging heat is 100 DEG C~200 DEG C.
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Cited By (4)
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| CN107174926A (en) * | 2017-06-28 | 2017-09-19 | 苏州华商新能源有限公司 | A kind of desulfuring and denitrifying apparatus automatically controlled |
| CN107335326A (en) * | 2017-06-28 | 2017-11-10 | 苏州华商新能源有限公司 | A kind of desulfuring and denitrifying apparatus |
| CN108088270A (en) * | 2017-12-01 | 2018-05-29 | 中冶长天国际工程有限责任公司 | A kind of sintering denitrating flue gas Tuo bioxin and UTILIZATION OF VESIDUAL HEAT IN integrated apparatus and method |
| CN111366003A (en) * | 2020-03-25 | 2020-07-03 | 攀钢集团攀枝花钢钒有限公司 | Sintering flue gas waste heat utilization structure in desulfurization and denitrification system |
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