CN107166971B - Sintering flue gas recycles low NOxDischarge technology - Google Patents

Sintering flue gas recycles low NOxDischarge technology Download PDF

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Publication number
CN107166971B
CN107166971B CN201710443524.1A CN201710443524A CN107166971B CN 107166971 B CN107166971 B CN 107166971B CN 201710443524 A CN201710443524 A CN 201710443524A CN 107166971 B CN107166971 B CN 107166971B
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China
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flue gas
sintering
flue
bellows
circulating
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CN201710443524.1A
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Chinese (zh)
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CN107166971A (en
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吴高明
王丽娜
丁翠娇
杨超
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武汉钢铁有限公司
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004Systems for reclaiming waste heat
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases

Abstract

The present invention relates to a kind of sintering flue gas circulated low NOx discharge technologies, technical solution includes that bellows of the sintering flue gas below sinter bed, bottom material, sintering pallet bottom double-edged fine-toothed comb, trolley enter flue, it is mixed from the be rapidly heated sintering flue gas ammonia that vaporizes formation at high temperature with the liquefied ammonia of penetrating and liquefied ammonia in bellows in section region of the tail section and flue gas, enters flue collector after denitration reduction reaction occurs under catalytic action;Sintering flue gas from the head section is drawn after the collection of corresponding bellows by circulating flue gas flue collector, it is sent into the circulating flue gas cover above sintering pallet, it is again introduced into sinter bed under the draft effect of high pressure blower, participate in sintering process and is again introduced into bellows after restoring denitration across trolley double-edged fine-toothed comb.Present invention process process is simple, not outsourcing catalyst realizes that good effective denitration, controllability, environmentally friendly, low equipment investment, operating cost are low, and can effectively remove the NOx in outlet sintering flue gas.

Description

Sintering flue gas circulated low NOx discharge technology

Technical field

The present invention relates to the flue-gas denitration process of environment protection field, specifically a kind of sintering flue gas circulated low NOx discharge Technique.

Background technique

Steel industry smoke pollution is one of the main source of China's atmosphere pollution, though steel industry has been during " 12th Five-Year Plan " Sintering flue gas desulfurization is completed, but denitration work just starts to walk, more mature SCR denitration technology is due to catalytic denitration temperature window Restriction, denitrification apparatus investment and operating cost it is higher, one-time investment is at high cost, and (wherein catalyst cost accounts for investment totle drilling cost 30-40%);Temperature window needs to consume a large amount of thermal energy to flue gas, additional increase generally between 350-450 DEG C The operating cost of SCR denitration.Low-temperature denitration catalyst is noble metal mostly, and cost is higher, and easily occur oxygen inhibition and Sulfur poisoning.Even if it is catalytic-reduction denitrified to sintering flue gas progress SCR to develop low cost, the catalyst of low temperature window, function NOx can only can be also removed, for the purification overall process of sintering flue gas, it is a set of that the removing of every kind of pollutant need to correspond to construction The pollutant removal of facility, each independent facility has a single function, and causes flue gas purification system process route long, takes up a large area, control System is complicated.

In order to reduce the scale of flue-gas cleaning devices, assistant rattan legendary ruler of great antiquity, the first of the Three August Ones political affairs etc. have been carried out the research of sintering flue gas circulation, will be sintered Flue gas partial circulation is again introduced into sintering machine, can obviously reduce the discharge amount of exhaust gas, it can be achieved that emission reduction 25-50%, has weight Big environmental and social benefits.But the property that the flue gas recirculation carried out at present is not directed to flue gas carries out subregion, sub-prime circulation, section Energy and emission reduction effect are unobvious, so that domestic be also not fully promoted application.

Trace analysis, its flue gas physical property of sintering machine different zones and composition are carried out by the flue gas to sintering machine different zones It distinguishes larger, as shown in Fig. 1-1, Fig. 1-2, Fig. 2-1, Fig. 2-2, is rapidly heated a section early period in flue gas, before 9, No. 10 bellows (bellows number presses two sides serial number, digital big correspondence head, small correspondence tail), flue-gas temperature is low, and NOx concentration is high; After the section that is rapidly heated (after 9, No. 10 bellows), flue-gas temperature is high, and NOx concentration is low.

On the other hand, Yao etc. has found γ-Fe2O3To NH3SCR denitration has stronger activity, reaches 95% at 250 DEG C Best denitration efficiency.Wang Fang etc. also demonstrates iron ore to low concentration of NO in flue gasxCatalysis reduction characteristic.In view of this, this Technology is acted on using ferrous oxide multicomponent concerted catalysis in sinter, and the flue gas in the middle part of sintering machine is rapidly heated section, to Penetrating ammonia in bellows is rich in the denitration catalyst effect that ferrous oxide multicomponent has, and temperature using the dust in flue gas At 300 DEG C or more, high temperature (denitration temperature window) waste heat for realizing sintering dust and flue gas makes full use of and synchronizes denitration degree Purpose.Meanwhile sintering machine is guided into the flue gas recirculation being rapidly heated section early period and is rapidly heated a section back segment, it is again introduced into sintered Journey had both saved the investment of denitration device, also eliminated outsourcing denitrating catalyst.

Summary of the invention

The purpose of the present invention is to solve above-mentioned technical problem, the flue gas pollutant generated for sintering machine different zones The sinter or the different response characteristics in the sintered compound bed of material of concentration difference and different zones, provide a kind of process flow Simply, not outsourcing catalyst realizes that good effective denitration, controllability, environmentally friendly, equipment investment, operating cost are low, and can have Imitate the sintering flue gas circulated low NOx discharge technology of emission reduction NOx.

Technical solution includes that sintering flue gas passes through sinter bed, bottom material, sintering board under the draft effect of high pressure blower Bellows below vehicle bottom double-edged fine-toothed comb, trolley enter flue, and sintering machine is divided into lighting section, machine along trolley direction of travel Head section, flue gas are rapidly heated 4 regions of section and tail section, and lighting section is located at sintering machine front end, which accounts for 1-2 bellows; Head section is located at the sintering machine first half after lighting section and extends in the middle part of sintering machine, which accounts for sintering machine total length 35-45%;The flue gas section that is rapidly heated is located in the middle part of sintering machine tail direction partially, which accounts for 2-4 bellows;Tail section is located at Sintering machine it is latter half of, which accounts for the 35-45% of sintering machine total length;200 DEG C of > of tail section sintering flue gas temperature, NOx is dense Spend < 100mg/Nm3;Flue gas is rapidly heated section 80-200 DEG C of a sintering flue gas temperature, NOx concentration > 100mg/Nm3;Head section is burnt 80 DEG C of flue-gas temperature < of knot, NOx concentration 300mg/Nm3More than;80 DEG C of < of lighting section sintering flue gas temperature, NOx concentration < 100mg/Nm3, the flue includes flue collector and circulating flue gas flue collector, is quickly risen from the tail section and flue gas The ammonia that the sintering flue gas in temperature section region vaporizes formation with the liquefied ammonia of penetrating and liquefied ammonia in bellows at high temperature mixes, Enter flue collector after denitration reduction reaction occurs under the ferrous oxide catalytic action that sintering soot dust granule object is rich in;From described The sintering flue gas of head section is drawn after the collection of corresponding bellows by circulating flue gas flue collector, is sent into above sintering pallet In circulating flue gas cover, it is again introduced into sinter bed under the draft effect of high pressure blower, after participating in sintering process and restoring denitration It is again introduced into bellows across trolley double-edged fine-toothed comb.

The circulating flue gas cover is mounted on right above sintering machine, covers rear of sintering machine section and flue gas is rapidly heated section.

The rear of sintering machine section and flue gas are rapidly heated on the bellows side wall below section region and circumferentially install at least one Layer liquefied ammonia nozzle sprays into liquefied ammonia by nozzle and enters bellows and be vaporized into ammonia and mix with sintering flue gas, the richness in sintering flue gas Denitration reaction occurs with the NOx in flue gas under catalytic action containing ferrous oxide.

The liquefied ammonia nozzle ejiction opening that the tail section and flue gas are rapidly heated on the bellows side wall below section tilts upward, and makes Liquefied ammonia sprays on pallet bottom double-edged fine-toothed comb, or make liquefied ammonia emission direction and sintering flue gas flow direction on the contrary, or two directions angle Greater than 90 degree.

The flue gas that the flue collector is drawn is sent into subsequent electrostatic/cloth bag after the cooling of circulating flue gas heat exchanger indirect heat exchange and is removed In dirt device.

The flue further includes having head lighting section flue, and the sintering flue gas from the lighting section is by corresponding wind Case is directly led out after collecting to be entered in subsequent electrostatic/bag filter through head lighting section flue.

Sintering flue gas from circulating flue gas flue collector first enters circulating flue gas after circulating flue gas deduster dedusting and exchanges heat Circulating flue gas cover is sent into after the flue gas indirect heat exchange that device and circulating flue gas flue collector introduce.

Inventor's analysis finds, pollutant concentration is not in the sintering flue gas temperature and flue gas that sintering machine different zones generate Together, 200 DEG C of tail section sintering flue gas temperature >, NOx concentration < 100mg/Nm3;Flue gas is rapidly heated a section sintering flue gas temperature 80-200 DEG C, NOx concentration > 100mg/Nm3;80 DEG C of < of head section sintering flue gas temperature, NOx concentration 300mg/Nm3More than;Point Fiery 80 DEG C of section sintering flue gas temperature <, NOx concentration < 100mg/Nm3If directly all sintering flue gases all sent without difference Enter mixing in flue, then the flue dust temperature in flue collector can be made to decline, influence sintering flue gas in high-temperature flue gas flue collector row Reduction denitration reaction in.The flue is divided into flue collector, circulating flue gas flue collector and head lighting section cigarette accordingly Road, from tail section and flue gas be rapidly heated section sintering flue gas temperature it is higher, therefore can be mixed with liquefied ammonia in the bellows of lower section It closes, creates the temperature for meeting denitration reaction, raw material and catalysts conditions, it is direct that this partial fume is not mixed into other low-temperature flue gas It is sent into flue collector, can also continue to that denitration reaction occurs in subsequent flue collector;Sintering flue gas temperature from the head section is low And NOx concentration is higher, when this partial fume denitrating is handled, need to heat to denitration temperature window, energy consumption is high, also needs outsourcing de- Denox catalyst, processing cost is big, this partial fume is drawn after the collection of corresponding bellows separately through circulating flue gas flue collector, Inventor is dexterously sent into the circulating flue gas cover above sintering pallet, is again introduced into burning under the draft effect of high pressure blower Ramming material layer participates in sintering process and is again introduced into bellows after restoring denitration across trolley double-edged fine-toothed comb;By the way that circulating flue gas cover is pacified Right above the sintering machine, covers rear of sintering machine section and flue gas is rapidly heated section, this partial fume is made to be transmitted back to temperature highest Rear of sintering machine section and flue gas be rapidly heated a section region, such technical effect is main are as follows: the 1. cigarette of the high NOx concentration of head section Section that gas is recycled into tail section and flue gas is rapidly heated, when passing through sinter bed, the zone sintering bed of material is rich in there is iron series oxygen Compound, while oxygen concentration is relatively low (lower than the oxygen concentration in air) in circulating flue gas, the flue gas that sintering process is formed contains Certain reducing gas takes off NOx under the catalytic action of ferrous oxide when circulating flue gas passes through sinter bed It removes;2. head section draw circulating flue gas humidity ratio air humidity it is big, circulating flue gas pass through sinter bed when resistance compared with Air is low, reduces the drag losses that gas passes through sinter bed;3. tail section and flue gas are rapidly heated section by heat exchanger Flue gas and circulating flue gas exchange heat, recycled the waste heat of flue gas, reduced the flue-gas temperature into subsequent electrostatic/bag filter, Save needs supplement air at room temperature used by cooling down to sintering flue gas to be increased before entering deduster in former smoke processing system Energy consumption;4. the part circulation of sintering flue gas reduces the outer discharge capacity of flue gas, the load of subsequent flue gas purification system is reduced;⑤ It is rapidly heated in the corresponding bellows in section region to tail section and flue gas and sprays into liquefied ammonia, make full use of the region denitrating flue gas temperature window Mouthful, particulate matter is saved the equipment investment of denitration and is taken off rich in further denitration under the catalytic action of ferrous oxide in flue gas The investment of denox catalyst;6. lighting section sintering flue gas temperature is lower, if flue collector can be reduced by being directly mixed in the flue gas of flue collector Middle flue-gas temperature is unfavorable for creating advantageous denitration environment, therefore considers that this is partially sintered to flue gas collects through the bellows of lower section It is sent into electrostatic/bag filter dedusting together with after the sintering flue gas mixing in flue collector again by head lighting section flue.It is logical Crossing the flue gas of different zones according to its feature difference dual treatment is exactly the important inventive point of the application.

Tail section to flue gas is rapidly heated in the bellows below section region, and flue-gas temperature is higher (to meet the thermotonus of denitration Condition), and also highest (the containing a large amount of ferrous oxides) of the sintering flue gas dust content in bellows, sintering flue gas is in bellows Residence time it is also longer, liquefied ammonia is sprayed into bellows at this time, using the dust in flue gas rich in ferrous oxide multicomponent have Some denitration catalyst effects, and temperature, at 300 DEG C or so, (denitration temperature window) waste heat for realizing sintering dust and flue gas fills Divide the purpose for utilizing and synchronizing denitration.And it since the sintering flue gas in bellows is the first step of fume treatment, sprays into here It is anti-can also to continue generation denitration even if cannot completely consume during the conveying of subsequent flue collector, subsequent dedusting etc. for liquefied ammonia It answers, has expanded the use function of existing apparatus.

Further, the ammonia spray nozzle ejiction opening in bellows tilts upward, and purpose has three: (1) making liquefied ammonia and its vapour Change the ammonia formed inversely to contact with sintering flue gas, improves the mixed effect of ammonia and sintering flue gas;(2) most of liquefied ammonia meeting On the double-edged fine-toothed comb for spraying to trolley bottom surface, and dust content is high in the zone sintering flue gas, and temperature is just in SCR denitration temperature window Mouthful, denitration effect is best;(3) fraction liquefied ammonia can pass through double-edged fine-toothed comb gap and enter in the sinter bottom material of pallet bottom, directly exist Under the catalytic action of ferrous oxide contained by bottom material in flue dust NOx occur it is catalytic-reduction denitrified react, further increase Denitration effect.It is therefore preferable that the ammonia spray nozzle is located at the upper section of the bellows, the ammonia spray nozzle can set one layer or more Layer, every layer uniformly distributed multiple, to guarantee that ammoniacal liquor is uniformly mixed with sintering flue gas.

The utility model has the advantages that

(1) flue gas of sintering machine different zones is introduced between different flues and carries out dual treatment, taken full advantage of The flue dust temperature that rear of sintering machine section and flue gas are rapidly heated in section corresponding bellows in region lower section is high, and flue dust dustiness is big, is rich in Ferrous oxide sprays into liquefied ammonia into bellows, realizes the online denitration of flue gas, firing chamber need to supplement when saving SCR denitration External heat source and catalyst;

(2) flue gas recirculation of the high NOx concentration of head section enters tail section and flue gas is rapidly heated section, is passing through sinter bed When, which, which is rich in, ferrous oxide, while oxygen concentration is relatively low (lower than the oxygen in air in circulating flue gas Concentration), the flue gas of sintering process contains certain reducing gas, when circulating flue gas passes through sinter bed, in ferrous oxide NOx is removed under catalytic action;

(3) humidity of the humidity ratio air for the circulating flue gas that head section is drawn is big, when circulating flue gas is across sinter bed Resistance is low compared with air, reduces the drag losses that gas passes through sinter bed;

(4) by heat exchanger by tail section and flue gas be rapidly heated section flue gas and circulating flue gas exchange heat, recycled higher The fume afterheat of temperature reduces the flue-gas temperature of subsequent electrostatic/bag filter, saves original system using supplement air pair The increased power consumption of sintering flue gas cooling institute;

(5) the part circulation of sintering flue gas is again introduced into sinter bed, reduces the outer discharge capacity of flue gas, reduces subsequent cigarette The load of gas purification system;

(6) present invention process achievees the purpose that effective denitration under the premise of not adding catalyst outside, makes full use of more than system Heat, NOx abatement amount 70% reduce denitration cost 70% compared with traditional SCR denitration process, and denitration device investment can reduce 40%, have a vast market application prospect.

Detailed description of the invention

Fig. 1-1 is NOx concentration analytical table in 10-23 bellows flue gas;

Fig. 1-2 is NOx concentration analytical table in 24-46 bellows flue gas;

Fig. 2-1 is flue-gas temperature analytical table in 10-23 bellows flue gas;

Fig. 2-2 is flue-gas temperature analytical table in 24-46 bellows flue gas;

Fig. 3 is process flow chart of the invention.

Wherein, 1- circulating flue gas cover, 2- sintering machine, 2.1- trolley, 3- sinter bed, 3.1- bottom material, the spray of 4- liquefied ammonia Mouth, 5- liquefied ammonia, 6- bellows, 7- flue collector, 8- circulating flue gas pipeline, 9- circulating flue gas blower, 10- head lighting section cigarette Road, 11- circulating flue gas heat exchanger, 12- circulating flue gas deduster, 13- circulating flue gas flue collector, 14- electrostatic/bag filter, 15- high pressure blower.

Specific embodiment

Referring to Fig. 1, the present invention includes sintering machine 2, and bellows 6,6 bottom of bellows are equipped with below the trolley 2.1 of the sintering machine 2 Outlet flue duct, along trolley direction of travel sintering machine be divided into lighting section, head section, flue gas be rapidly heated section and 4 regions of tail section, the tail section to flue gas are rapidly heated in the bellows 6 below section region and are respectively arranged with liquefied ammonia nozzle 4;It is described Flue includes flue collector 7, circulating flue gas flue collector 13 and head lighting section flue 10, and the tail section and flue gas quickly rise The outlet of 6 outlet flue collector 7 of bellows below temperature section, flue collector 7 connects through the tube side of circulating flue gas heat exchanger 11 or shell side Connect electrostatic/bag filter 14;Bellows 6 below the head section are exported through circulating flue gas flue collector 13 through circulating flue gas dedusting Device 12, the shell side of circulating flue gas heat exchanger 11 or tube side, circulating flue gas pipeline 8 are connected to the circulation cigarette of 2.1 top of sintering pallet Gas hood 1, the circulating flue gas cover 1 are mounted on right above sintering machine 2, cover rear of sintering machine section and flue gas is rapidly heated section.Institute The tail section and flue gas for stating sintering machine 2 are rapidly heated on section region lower section 6 side wall of bellows, and circumferentially at least one layer of liquefied ammonia of installation sprays Mouth 4, preferably liquefied ammonia nozzle 4 tilt upward, and spray to liquefied ammonia 5 on 2.1 bottom double-edged fine-toothed comb of trolley, make liquefied ammonia emission direction and flue gas stream Contrary or two directions angles are moved greater than 90 degree.

With certain steel mill 450m2For the sintering flue gas processing that sintering machine generates, mixed flue gas (contains lighting section, head section, cigarette Gas is rapidly heated 4 regions of section and tail section) NOx content be 264mg/m3, 120-200 DEG C of flue-gas temperature, using the present invention The step of method, is as follows:

Sintering flue gas passes through sinter bed 3, bottom material 3.1,2.1 bottom of sintering pallet under the draft effect of high pressure blower Double-edged fine-toothed comb, the lower section of trolley 2.1 bellows 6 enter flue, along 2.1 direction of travel of trolley by sintering machine 1 be divided into lighting section, Head section, flue gas are rapidly heated 4 regions of section and tail section, and lighting section is located at sintering machine front end, which accounts for 1-2 wind Case;Head section is located at the sintering machine first half after lighting section and extends in the middle part of sintering machine, which accounts for sintering machine total length 35-45%;The flue gas section that is rapidly heated is located in the middle part of sintering machine tail direction partially, which accounts for 2-4 bellows;Tail section In the latter half of of sintering machine, which accounts for the 35-45% of sintering machine total length;200 DEG C of > of tail section sintering flue gas temperature, NOx Concentration < 100mg/Nm3;Flue gas is rapidly heated section 80-200 DEG C of a sintering flue gas temperature, NOx concentration > 100mg/Nm3;Head section 80 DEG C of sintering flue gas temperature <, NOx concentration 300mg/Nm3More than;80 DEG C of < of lighting section sintering flue gas temperature, NOx concentration < 100mg/Nm3, the flue includes flue collector 7, circulating flue gas flue collector 13 and head lighting section flue 10, comes from institute State tail section and flue gas be rapidly heated section region sintering flue gas in bellows 5 with the liquefied ammonia and liquid that are sprayed into through liquefied ammonia nozzle 4 Ammonia vaporizes the ammonia mixing of formation at high temperature, and denitration reduction occurs under the ferrous oxide catalytic action that sintering flue gas is rich in Enter flue collector 7 after reaction, then is sent after being sent into 14 dedusting of electrostatic/bag filter after the heat exchange cooling of circulating flue gas heat exchanger 11 Enter subsequent processing;Sintering flue gas from the head section is sent after the collection of corresponding bellows 6 by circulating flue gas flue collector 13 Enter 12 dedusting of circulating flue gas deduster, then after the heating of the sintering flue gas indirect heat exchange of circulating flue gas heat exchanger 11 and flue collector 7 It is sent into circulating flue gas cover 1 through circulating flue gas pipeline 8, since circulating flue gas cover 1 is mounted on right above sintering machine 2, covers sintering machine Tail section and flue gas are rapidly heated section, thus this to partially sinter tail section and flue gas that flue gas can be corresponded into sintering machine 1 quick Warming-up section, under the catalytic-reduction denitrified effect for the ferrous oxide being rich in the sinter bed in the region, circulating flue gas is being worn When the oversintering bed of material, NOx therein is reduced;The sintering flue gas of the lighting section is directly led out after being collected by corresponding bellows 6 Enter in subsequent electrostatic/bag filter 14 together through the flue gas in head lighting section flue 10 and flue collector 7.

The rear of sintering machine section and flue gas are rapidly heated on 6 side wall of bellows below section region and circumferentially install at least one The liquefied ammonia nozzle 4 that tilts upward of layer, sprays into liquefied ammonia by nozzle and enters bellows and be vaporized into ammonia and mix with sintering flue gas, is burning It ties and denitration reaction occurs with the NOx in flue gas under the catalytic action in flue gas rich in ferrous oxide.The liquefied ammonia spray tilted upward Mouth 4 can be such that liquefied ammonia sprays on pallet bottom double-edged fine-toothed comb, make liquefied ammonia emission direction and sintering flue gas flow direction on the contrary, or two directions Angle be greater than 90 degree.It is preferred that the liquefied ammonia amount sprayed into is by NOx: the NH in flue dust3=1: the molar ratio of (1.0-1.05) sprays into.

Sintering flue gas NOx discharge after processing reduces 70% or more.

Catalyst is not used using above-mentioned denitrating technique whole process, using containing in the particulate matter in sinter bed and sintering flue gas There is the denitration catalyst activity of ferrous oxide, make ammonia and NOx reaction denitration, reduces denitration device investment, take full advantage of technique Waste heat in the process reduces denitration cost 70% compared with traditional SCR denitration process, reduces denitration device investment 70%.

Claims (7)

1. a kind of sintering flue gas circulated low NOx discharge technology is passed through under the draft effect of high pressure blower including sintering flue gas and is burnt Ramming material layer, bottom material, sintering pallet bottom double-edged fine-toothed comb, the bellows below trolley enter flue, will burn along trolley direction of travel Knot machine is divided into lighting section, head section, flue gas and is rapidly heated 4 regions of section and tail section, before lighting section is located at sintering machine most End, which accounts for 1-2 bellows;Head section is located at the sintering machine first half after lighting section and extends in the middle part of sintering machine, should Region accounts for the 35-45% of sintering machine total length;The flue gas section that is rapidly heated is located in the middle part of sintering machine tail direction partially, which accounts for 2-4 bellows;Tail section is located at the latter half of of sintering machine, which accounts for the 35-45% of sintering machine total length;The sintering of tail section 200 DEG C of flue-gas temperature >, NOx concentration < 100mg/Nm3;Flue gas is rapidly heated section 80-200 DEG C of a sintering flue gas temperature, and NOx is dense Spend > 100mg/Nm3;80 DEG C of < of head section sintering flue gas temperature, NOx concentration 300mg/Nm3More than;Lighting section sintering flue gas temperature 80 DEG C of <, NOx concentration < 100mg/Nm3, which is characterized in that the flue includes flue collector and circulating flue gas flue collector, From the tail section and flue gas be rapidly heated section region sintering flue gas in bellows with the liquefied ammonia of penetrating and liquefied ammonia in height The ammonia mixing that the lower vaporization of temperature is formed, occurs denitration reduction under the ferrous oxide catalytic action that sintering soot dust granule object is rich in Enter flue collector after reaction;Sintering flue gas from the head section passes through circulating flue gas flue collector after the collection of corresponding bellows It draws, is sent into the circulating flue gas cover above sintering pallet, be again introduced into sinter bed under the draft effect of high pressure blower, It participates in sintering process and is again introduced into bellows after restoring denitration across trolley double-edged fine-toothed comb.
2. sintering flue gas circulated low NOx discharge technology as described in claim 1, which is characterized in that the circulating flue gas cover peace Right above the sintering machine, covers rear of sintering machine section and flue gas is rapidly heated section.
3. sintering flue gas circulated low NOx discharge technology as described in claim 1, which is characterized in that the rear of sintering machine section It is rapidly heated on the bellows side wall below section region with flue gas and at least one layer of liquefied ammonia nozzle is circumferentially installed, liquid is sprayed by nozzle Ammonia enters bellows and is vaporized into ammonia to be mixed with sintering flue gas, under the catalytic action in sintering flue gas rich in iron series polyoxide Denitration reaction occurs with the NOx in flue gas.
4. sintering flue gas circulated low NOx discharge technology as claimed in claim 3, which is characterized in that the tail section and flue gas Liquefied ammonia nozzle ejiction opening on bellows side wall below the section that is rapidly heated tilts upward, and sprays to liquefied ammonia on pallet bottom double-edged fine-toothed comb, Make liquefied ammonia emission direction and sintering flue gas flow direction on the contrary, or the angle in two directions be greater than 90 degree.
5. sintering flue gas circulated low NOx discharge technology according to any one of claims 1-4, which is characterized in that the main cigarette The flue gas that road is drawn is sent into subsequent electrostatic/bag filter after the cooling of circulating flue gas heat exchanger indirect heat exchange.
6. sintering flue gas circulated low NOx discharge technology as claimed in claim 5, which is characterized in that the flue also wraps Head lighting section flue is included, the sintering flue gas from the lighting section is directly led out after being collected by corresponding bellows through head point Fiery section flue enters in subsequent electrostatic/bag filter.
7. sintering flue gas circulated low NOx discharge technology as claimed in claim 5, which is characterized in that come from the main cigarette of circulating flue gas The sintering flue gas in road first enters what circulating flue gas heat exchanger was introduced with circulating flue gas flue collector after circulating flue gas deduster dedusting Circulating flue gas cover is sent into after flue gas indirect heat exchange.
CN201710443524.1A 2017-06-13 2017-06-13 Sintering flue gas recycles low NOxDischarge technology CN107166971B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5482304A (en) * 1977-12-14 1979-06-30 Sumitomo Metal Ind Ltd Nox decreasing method in manufacture of sintered ore
CN102188905A (en) * 2011-05-11 2011-09-21 宝钢工程技术集团有限公司 Low-carbon method for improving emission reduction efficiency of oxynitride in circulated flue gas from sintering machine
CN102936651A (en) * 2012-10-23 2013-02-20 鞍钢股份有限公司 Simultaneous sintering and desulphurization and denitration system, and desulphurization and denitration method
CN104764340A (en) * 2015-04-13 2015-07-08 清华大学 Flue gas circulation system and method for sintering machine flue gas recirculation denitration
CN104792186A (en) * 2015-03-31 2015-07-22 孙慕文 Sintering flue gas energy-saving type denitrification system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5482304A (en) * 1977-12-14 1979-06-30 Sumitomo Metal Ind Ltd Nox decreasing method in manufacture of sintered ore
CN102188905A (en) * 2011-05-11 2011-09-21 宝钢工程技术集团有限公司 Low-carbon method for improving emission reduction efficiency of oxynitride in circulated flue gas from sintering machine
CN102936651A (en) * 2012-10-23 2013-02-20 鞍钢股份有限公司 Simultaneous sintering and desulphurization and denitration system, and desulphurization and denitration method
CN104792186A (en) * 2015-03-31 2015-07-22 孙慕文 Sintering flue gas energy-saving type denitrification system
CN104764340A (en) * 2015-04-13 2015-07-08 清华大学 Flue gas circulation system and method for sintering machine flue gas recirculation denitration

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