CN107314677B - NOx abatement system based on dry pack ignition sintering - Google Patents

NOx abatement system based on dry pack ignition sintering Download PDF

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Publication number
CN107314677B
CN107314677B CN201710682127.XA CN201710682127A CN107314677B CN 107314677 B CN107314677 B CN 107314677B CN 201710682127 A CN201710682127 A CN 201710682127A CN 107314677 B CN107314677 B CN 107314677B
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flue gas
sintering
nox
temperature
drying
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CN107314677A (en
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吴高明
韩斌
吴晓晖
泰林波
陈铁军
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WUHAN WUTUO TECHNOLOGY Co Ltd
Wuhan University of Science and Engineering WUSE
Wuhan Iron and Steel Co Ltd
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WUHAN WUTUO TECHNOLOGY Co Ltd
Wuhan University of Science and Engineering WUSE
Wuhan Iron and Steel Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • 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
    • 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
    • F27D2017/009Cyclone for separating fines from gas

Abstract

The invention discloses a kind of NOx abatement systems based on dry pack ignition sintering, technical solution includes sintering machine, bellows are equipped with below the trolley of the sintering machine, it is divided into preheating and drying section, lighting section, flue gas along trolley direction of travel sintering machine to be rapidly heated 4 regions of section and tail section, the bellows below the tail section successively connect the high temperature circulation flue gas cover being located above the preheating and drying section through fluidized-bed reactor, high-temperature flue gas flue collector, dust collector for high-temperature flue, high-temperature flue gas circulating fan and high-temperature flue gas circulation pipe.Present system pollutant discharge amount is few, sintering flue gas waste heat recovery rate is high, without using outsourcing denitrating catalyst, NOx in flue gas be effectively reduced generate.

Description

NOx abatement system based on dry pack ignition sintering
Technical field
The present invention relates to environment protection field, a kind of particularly NOx abatement system based on dry pack ignition sintering.
Background technique
With the fast development of steel and iron industry, natural rich ore much can not meet blast furnace process in yield and quality It is required that in order to meet increasingly enlarged blast fumance, the sintering technology of ore agglomerates obtains significant progress.The place of its material Reason amount accounts for about the second of integrated iron and steel works, becomes production process important in modern steel industry.However, due to the process Energy consumption is high, pollutant yield is big, seriously restricts the sustainable development of steel and iron industry.It is total that the process energy consumption accounts for steel production The 10-20% of energy consumption, exhaust gas volumn 1500-2500m3The cold exhausted air quantity of/t-s, ring about 2200m3/ t-s, and flue gas contains dust, SO2、 The environmental contaminants of the Various Complexes such as NOx, dioxin, VOCs, heavy metal are steel primary pollution source.
Recent State Ministry of Environmental Protection has issued " steel sintering, pelletizing industrial air pollution object discharge standard " (GB 28662- 2012) it modifies single (exposure draft), the particulate matter limit value of sintering machine in table 3 and pellet roasting equipment is adjusted to 20mg/m3、 Sulfur dioxide limit value is adjusted to 50mg/m3, nitrogen oxides limit value be adjusted to 100mg/m3
The pollutant removal technology generallyd use at present is concentrated mainly on the end treatment outside sintering system.If foreign countries are to burning Smoke multi-pollutant control technology is tied, mainly includes desulfurization technology, activated coke integrated technique, cycle sintering technology, combined type Desulfurization+denitration technology etc..The Treatment process that the country uses is introduced from foreign countries substantially.2010, Taiyuan Iron and Steel Co. introduced Sumitomo Heavy Industries Ltd's activity Burnt flue gas purification device, realizes SO2, part NOx, dioxin, heavy metal, dust etc. joint removing.2013, in Taiwan Steel implements wet-type magnesia desulfurization+SCR denitration process to its No. 4 sintering machines.In steel industry at home, to coke oven flue gas Using sodium base SDA+SCR denitration, has multiprocessing engineering construction example.The prevailing technology of domestic sintering flue gas desulfurization denitration is at present SDA desulfurization+SCR denitration and active carbon/coke method.
It can be seen that from above technology and Engineering Projects, the Processing tecchnics of sintering flue gas pollutant mostly concentrate on single dirt The combination for the monomer technical unit that object is administered is contaminated, such scheme leads to flue gas managing technique route length, takes up a large area, is excessively program-controlled A series of problems, such as system is complicated, investment is big, operating cost is high, brings huge cost pressure to iron and steel enterprise.Especially work as For preceding more universally recognized SCR denitration technology in application, since sulphur can cause catalyst poisoning in sintering flue gas improvement, SCR is de- After generally desulphurization system is arranged in nitre system, flue-gas temperature is caused to further decrease, is far below SCR denitration temperature window.So In current sintering flue gas SCR denitration Engineering Projects, need to provide additional energy makes flue gas heating reach SCR denitration temperature window, Additional increased denitration cost.Meanwhile SCR denitration contains noble metal, manufacturing cost is high, and it is big that difficulty is disposed after failure.
For these problems, overall process regulation is produced by sintering process source, technique, develops sintering flue gas multi-pollutant Whole Process Control coupling technique, it has also become the research hotspot of steel sintering process pollution emission reduction, such as peaceful steel, Sha Gang at home Enterprise has carried out the engineer application for using flue gas recirculation technology to reduce gross contamination emission, although being recycled by sintering flue gas With certain energy conservation, emission reduction effect, but national environmental standard much can not meet to the NOx abatement effect in sintering flue gas and want It asks.
The existing strand exhaust sintering technique being widely used is to be equipped with mixture (Iron Ore Powder, fuel, flux and return mine) Suitable moisture is layered on the fire grate of continuous pallettype sintering machine after mixing, granulation, with certain negative pressure exhausting after igniting, makes sintered Journey carries out from top to down, i.e., sintering process runs through entire sintering machine.Since sintering process carries out from top to down, thus along material There are apparent layer structures in layer height direction.It is physico according to being occurred in the variation and sintering process of temperature in sinter bed The difference for learning variation, can be divided into 5 layers for the bed of material being sintered from top to down, be followed successively by sintering ore bed, burning zone, preheating Layer, drying layer, excessive moistening layer.Occur in succession for 5 layers after igniting, constantly moves down.It is divided along belt sintering trolley direction of travel, Sintering machine is divided into 4 regions, is followed successively by ignition zone, low-temperature flue gas region, flue gas are rapidly heated region, high-temperature flue gas area Domain.
In the sintering flue gas temperature and pollutant concentration of sintering machine different zones, there are biggish differences, such as in ignition zone Flue-gas temperature is low, and NOx concentration is also low;In low-temperature flue gas region, flue-gas temperature is low, and NOx concentration is high;Flue gas is rapidly heated region cigarette Temperature degree from 100 DEG C or less be quickly raised to 200 DEG C even more than, NOx concentration then shows opposite trend;High-temperature flue gas region 200 DEG C of flue-gas temperature or more, up to 400 DEG C, NOx concentration is lower, less than 100mg/Nm3
The characteristics of same amount does not pollute is generated by different periods in analysis sintering process, there is by changing existing sintering System realizes that the emission reduction of certain pollutants may during the sintering process.Such as during the sintering process, the higher area of sintering flue gas temperature Domain, the concentration of NOx is lower in flue gas, less than 100mg/Nm3.Sinter composition analysis is found simultaneously, containing big in sinter Amount can have the α-Fe of catalysis reduction to NOx2O3Phase, there is the generations of NOx and removal in sintering process itself for this explanation Process generated at sintering flame front before this, when the NOx of generation passes through sinter bed with flue gas, in suitable temperature and cigarette Under also gas point in gas, SCR reduction reaction is carried out.So recycling in conjunction with sintering flue gas, change existing sintering schedule, sintered The exploitation of the sintering new process of the emission reduction of pollutant is realized in journey, it has also become the urgent need of sintering process clean manufacturing.
Summary of the invention
The purpose of the present invention is to solve above-mentioned technical problem, provide a kind of simple system, sintering flue gas classified utilization, Flue gas waste heat recovery rate is high, without using outsourcing denitrating catalyst, denitration effect is good, NOx in flue gas is effectively reduced generate based on The NOx abatement system of dry pack ignition sintering.
Technical solution includes sintering machine, bellows is equipped with below the trolley of the sintering machine, along trolley direction of travel sintering machine It is divided into preheating and drying section, lighting section, flue gas to be rapidly heated 4 regions of section and tail section, the bellows below the tail section Successively followed through fluidized-bed reactor, high-temperature flue gas flue collector, dust collector for high-temperature flue, high-temperature flue gas circulating fan and high-temperature flue gas Endless tube connection is located at the high temperature circulation flue gas cover above the preheating and drying section.
The fluidized-bed reaction top sets fluidized bed airflow outlet, and lower part sets fluidized bed solid-phase outlet.
The preheating and drying section is additionally provided with heating device.
The heating device is infrared heating device, microwave heating equipment or electric heater unit.
The microwave heating equipment includes being located below material distributing machine, insertion trolley different depth in sinter mixture Multiple microwave applicators.
The waveguide ends of the microwave applicator protrude into 500-1000mm in sinter mixture.
It is horizontal along trolley direction of travel that the waveguide leading portion of the microwave applicator protrudes into the part inside sinter mixture Arrangement.
Below the preheating and drying section corresponding bellows outlet be sequentially connected low-temperature flue gas flue collector, low-temperature flue gas pipe, electrostatic/ Bag filter and main exhauster.
The corresponding bellows outlet below section region that is rapidly heated of the lighting section and flue gas is sequentially connected the high main cigarette of NOx flue gas Road, high NOx flue gas recirculation pipe, high NOx smoke duster, high NOx flue gas recirculation blower fan and sintering machine tail section correspond to trolley The high NOx circulating flue gas cover of top.
At least one layer of liquefied ammonia nozzle is circumferentially installed on corresponding bellows side wall below the tail section.
The liquefied ammonia nozzle is located at the top of the bellows, and circumferentially along bellows side wall, and nozzle ejiction opening is tilted towards On.
It is evenly arranged air balance pipe on the high NOx circulating flue gas cover, it is upper and lower for being connected to high NOx circulating flue gas cover Space.
The high temperature circulation flue gas cover is mounted on right above preheating and drying section, covers preheating and drying section part or whole area Domain.The preheating and drying section accounts for the 40-50% of sintering machine total length.
The problem of for background technique, inventor carry out subregion again to sintering machine, and different zones assign different Function.Preheating and drying section, lighting section, flue gas are divided into along trolley direction of travel sintering machine to be rapidly heated section and tail section, that is, are burnt Knot machine original moves back lighting section, while preheating and drying section is added before lighting section, and the purpose of setting preheating and drying section is: (1) Smoke-less pollution object formation zone is set, i.e., before sinter mixture ignition sintering, utilizes sintering flue gas waste heat and other auxiliary First dehumidification is dried to it in heat source, is completely dried mixture, does not increase gaseous pollutant newly;(2) sintering flue gas is effectively recycled Waste heat takes full advantage of the higher sintering flue gas waste heat of tail temperature, reduces sintering process energy consumption;(3) preheating is dry Dry section of a part for belonging to sintering machine, compact-sized, production process control is simple;(4) sinter mixture is in preheating and drying Duan Gan Dry to be warming up to 120 DEG C or more, mixture is easy to light a fire, and carries out stable sintering state rapidly, can shorten the length of lighting section, Firing temperature is reduced, the gaseous pollutant yield in ignition process is reduced;(5) length of the preheating and drying section preferably accounts for The 40-50% of knot machine total length, to guarantee the drying effect of mixture.On the other hand, inventor is each to improved sintering machine The flue gas that section generates has carried out research and has found: the only preheating and drying process of preheating and drying section, no sintering reaction, contains in flue gas Moisture content is higher, water content up to 10% (volume ratio) more than, NOx concentration < 100mg/Nm3, 150 DEG C of temperature <;Lighting section sintering Flue-gas temperature >=150 DEG C, NOx concentration 100-200mg/Nm3;Flue gas is rapidly heated section 150-250 DEG C of a sintering flue gas temperature, NOx Concentration 100-200mg/Nm3;250 DEG C of > of tail section sintering flue gas temperature, NOx concentration 100mg/Nm3Left and right.From the foregoing, it will be observed that machine NOx concentration is low in the sintering flue gas of endpiece, and it is close to generate flue gas with preheating and drying section, and temperature is much higher than preheating and drying section, Therefore, it can will be recycled to after this partial fume collecting dust-removing in preheating and drying section as heat source directly to mixed in predrying section It closes object to be dried, the waste heat being not only effectively utilized in flue gas, but also is conducive to fume centralized collection, this flue gas NOx concentration is low, It can be directly entered the further desulfurization of subsequent desulphurization system after dedusting, be not required to carry out denitration process by current national standard.Into One step, tail section region, which is sent into, after the sintering flue gas of lighting section and the section that is rapidly heated is collected participates in sintering reaction again, Purpose is: (1) this partially sinters NOx concentration height in flue gas, is re-fed into tail section and participates in sintering reaction, utilizes sintering The bed of material is rich in the reduction components contained in the SCR catalysis and flue gas that the iron series polyoxide having has, and in sinter bed In be suitable at a temperature of, the NOx contained further restores denitration, to reduce the NOx concentration in flue gas;(2) sufficiently sharp With the waste heat of this part of smoke, sintering process energy consumption is reduced;(3) reduce discharged gas fume amount, reduce pollutant Discharge amount;(4) load for reducing flue gas aftertreatment systems further reduced the subsequent treatment cost of flue gas.
In order to guarantee that mixture when entering lighting section on trolley is completely dried, temperature of charge can rise to 120-150 DEG C, it is also provided with assisted heating device in preheating and drying section, this assisted heating device can be other thermal currents, or Infrared heating device, microwave heating equipment or electric heater unit, this kind of heating device can flexibly, quickly and effectively pass through The mixture of preheating and drying section carries out auxiliary heating, be sintering flue gas as thermal current preheat predrying section shortage of heat when into The effective means of row auxiliary heating, when such as using microwave heating equipment, multiple microwave applicator waveguides are in insertion sinter layer Layered arrangement, the number or the number of plies of the microwave applicator that control is opened as needed, very flexibly and easily.The microwave applicator End of conduit protrude into 500-1000mm in sinter mixture, it is too deep to will increase equipment investment, shallowly will lead to live microwave spoke excessively It penetrates.Further, it is contemplated that the conduit leading portion of abrasion of the mixture to waveguide on trolley, the microwave applicator wave protrudes into burning The part tied in mixture is horizontally disposed along trolley direction of travel, and the abrasion of mixture can be greatly reduced, improve making for device Use the service life.
When using the heating of other thermal currents, individual flue gas cover, high NOx circulation are set above preheating and drying section trolley Flue gas cover covers preheating and drying section partial region, and the flue gas cover of other thermal currents setting covers preheating and drying section remainder subregion Domain, air-flow is drawn respectively into different subsequent smoke processing systems after corresponding drying.
Mixture when entering lighting section to realize on trolley is completely dried, and temperature of charge can rise to 120-150 DEG C, temperature sensor is set in 1-2 bellows of the preheating and drying section close to lighting section region, to monitor in the part bellows The temperature of sintering flue gas, and assisted heating device is controlled by the temperature value, it such as controls microwave applicator and opens the number of plies and heating Power increases the unlatching number of plies and heating power of microwave applicator when flue-gas temperature≤120 DEG C in bellows;When the region wind In case when flue-gas temperature >=150 DEG C, the unlatching number of plies and heating power of microwave applicator are reduced, or even all microwave heatings of closing the door Device.Since tail section corresponds to the NOx concentration 100mg/Nm of sintering flue gas in bellows3Left and right, is unable to stability contorting in 100mg/Nm3, After being recycled to preheating and drying section recovery waste heat, when final outlet, can not meet tighter discharge standard (100mg/Nm3Below) It is required that being sprayed by liquefied ammonia in view of this, circumferentially install at least one layer of liquefied ammonia nozzle below the tail section on corresponding bellows side wall Mouth sprays into liquefied ammonia in the sintering flue gas into bellows, since wind the temperature inside the box is high (temperature is at 250-400 DEG C), makes full use of this Region flue gas SCR denitration temperature window, creates the temperature for meeting denitration reaction, raw material and catalysts conditions, in flue gas Grain object sprays into liquefied ammonia rich in further denitration under the catalytic action of iron series polyoxide here, even if cannot completely consume, also It can continue that denitration reaction occurs during the conveying of subsequent flue and dedusting etc., expand the use function of existing apparatus, saved Save the equipment investment of denitration and the investment of denitrating catalyst.
The sintering flue gas that tail section corresponds to bellows out is introduced into fluidized-bed reactor before entering high-temperature flue gas flue collector, setting The main function of fluidized-bed reactor: first is that the particulate matter in enrichment flue dust;Second is that catalytic denitration, when sintering flue dust passes through fluidisation It is longer in this residence time when bed, and occur under the catalytic action of the ferrous oxide contained in close phase particulate matter efficiently also Former denitration reaction.As bed resistance >=2000Pa of fluidized-bed reactor, the fluidized bed for opening fluidized-bed reactor lower part is solid All or part of solid phase is discharged in phase exit valve 10-30 seconds.
Liquefied ammonia nozzle ejiction opening in bellows tilts upward, and purpose has three: (1) ammonia for being formed liquefied ammonia and its vaporization Gas is inversely contacted with sintering flue gas, improves the mixed effect of ammonia and sintering flue gas;(2) most of liquefied ammonia can spray to trolley bottom On the double-edged fine-toothed comb in face, and dust content is high in the zone sintering flue gas, and temperature is just in SCR denitration temperature window, denitration effect Most preferably;(3) fraction liquefied ammonia can pass through double-edged fine-toothed comb gap and enter in the sinter bottom material of pallet bottom, directly the iron contained by bottom material Be oxide catalytic action under in flue dust NOx occur it is catalytic-reduction denitrified react, further improve denitration effect.Cause This, the preferably described liquefied ammonia nozzle is located at the upper section of the bellows, and the liquefied ammonia nozzle can set one or more layers, and every layer uniformly distributed more It is a, to guarantee that ammoniacal liquor is uniformly mixed with sintering flue gas.
In order to improve fume afterheat utilization rate, high NOx circulating flue gas cover is mounted on right above tail section, covers tail section Whole region;High temperature circulation flue gas cover is mounted on right above preheating and drying section, covers preheating and drying section part or whole region.If Preheating and drying section partial region is covered, then remaining area is dried mixture as auxiliary thermal source using its thermal current, right Air-flow is drawn respectively into different subsequent smoke processing systems after the drying answered.
In order to guarantee the air balance in each region, it is evenly arranged air balance hole on high NOx circulating flue gas cover, to guarantee Air quantity into tail section whole region sinter bed is stablized, to guarantee steady into the air quantity of preheating and drying section whole region It is fixed.
The utility model has the advantages that
(1) four regions of sintering machine are repartitioned, lighting section moves back, and adds preheating and drying section, first carries out to mixture Predrying and preheating, then ignition greatly reduce the generation of NOx in sintering flue gas;Added by being added in preheating and drying section Thermal guarantees that mixture is fully warmed-up and dries before ignition.
(2) it according to by the smoke characteristic of sintering machine different zones, is introduced between different flues and carries out dual treatment, fill Divide the sintering flue gas temperature being utilized below rear of sintering machine section in corresponding bellows high, dustiness is big, it is rich in iron series polyoxide, Liquefied ammonia is sprayed into bellows, realizes the online denitration of flue gas, the external heat source that firing chamber need to supplement when saving SCR denitration and is urged Agent reduces the load of subsequent flue gas purification system;
(3) sintering flue gas of the high NOx concentration of lighting section and the section that is rapidly heated is recycled into tail section, is passing through sintering feed When layer, which, which is rich in, iron series polyoxide, while oxygen concentration is relatively low (lower than in air in circulating flue gas Oxygen concentration), the flue gas of sintering process contains certain reducing gas, when circulating flue gas passes through sinter bed, in iron series polyoxy NOx is removed under the catalytic action of compound;
(4) sinter mixture preheating and drying section drying be warming up to 120 DEG C or more, mixture is easy to light a fire, and rapidly into Row stable sintering state can shorten the length of lighting section, reduce firing temperature, reduce the gaseous pollutant in ignition process Yield;
(5) 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, are not required to any denitration device investment, Have a vast market application prospect.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Wherein, 1- high NOx flue gas recirculation cover, 1.1- air balance pipe, 2- sintering machine, 2.1- trolley, 3- sinter bed, 3.1- bottom material, 4- liquefied ammonia nozzle, 5- liquefied ammonia, 6- bellows, 7- high-temperature flue gas circulation pipe, 8- high-temperature flue gas circulating fan, 9- high temperature Smoke duster, 10- high-temperature flue gas flue collector, 11- high NOx circulating fan, 12- high NOx smoke duster, 13- high NOx flue gas Circulation pipe, 14- ignition system, 15- high temperature circulation flue gas cover, 16- material distributing machine, 17- electrostatic/bag filter, 18- high NOx cigarette Gas flue collector, 19- main exhauster, 20- microwave applicator, 20.1- waveguide, 21- low-temperature flue gas pipe, the main cigarette of 22- low-temperature flue gas Road, 23- fluidized-bed reactor, the outlet of 23.1- fluidized bed airflow, 23.2- fluidized bed solid-phase outlet.
Specific embodiment
Referring to Fig. 1, for the system of present invention process, including sintering machine 2, it is equipped with below the trolley 2.1 of the sintering machine 2 Bellows 6 are divided into preheating and drying section, lighting section, flue gas along trolley direction of travel sintering machine and are rapidly heated section and tail section 4 Region, the bellows 6 below the tail section are successively through fluidized-bed reactor 23, high-temperature flue gas flue collector 10, high temperature fume dust removal Device 9, high-temperature flue gas circulating fan 8 and the connection of high-temperature flue gas circulation pipe 7 are located at the high temperature circulation cigarette above the preheating and drying section Gas hood 15.The corresponding outlet of a bellows 6 below section region that is rapidly heated of the lighting section and flue gas is sequentially connected the high main cigarette of NOx flue gas Road 18, high NOx flue gas recirculation pipe 13, high NOx smoke duster 12, high NOx flue gas recirculation blower fan 11 and sintering machine 2 tail section High NOx circulating flue gas cover 1 above corresponding trolley, the high NOx circulating flue gas cover 1 are uniformly flat equipped with multiple air quantity for being used to lead to Weigh pipe 1.1;Below the preheating and drying section the corresponding outlet of bellows 6 be sequentially connected low-temperature flue gas flue collector 22, low-temperature flue gas pipe 21, Electrostatic/bag filter 17 and main exhauster 19.
At least one layer of ammonia spray nozzle 4 is circumferentially installed on corresponding 6 side wall of bellows below the tail section.The ammonium hydroxide spray Mouth 5 is located at the top of the bellows 6, and circumferentially along bellows side wall, and nozzle ejiction opening tilts upward.
23 top of fluidized-bed reactor sets fluidized bed airflow outlet 23.1, and lower part sets fluidized bed solid-phase outlet 23.2. The preheating and drying section is additionally provided with heating device, and the heating device can be infrared heating device, microwave heating equipment or electricity Heating device, preferably microwave heating equipment, the specific microwave heating equipment include positioned at 16 lower section of material distributing machine, insert stand On vehicle 2.1 in sinter mixture different depth multiple microwave applicators 20.20.1 end of waveguide of the microwave applicator 20 Portion deeply protrudes into 500-1000mm in sinter mixture, and leading portion is horizontally disposed along 2.1 direction of travel of trolley.
Each section of region of the sintering machine is defined as follows:
Preheating and drying section lighting section is located at 2 front end of sintering machine, accounts for the 40-50% of sintering machine total length, and only preheating is dry Dry process, no sintering reaction is higher containing moisture content in flue gas, water content up to 10% (volume ratio) more than, NOx concentration < 100mg/Nm3;Lighting section is burnt after preheating and drying section, sintering flue gas temperature >=150 DEG C, NOx concentration 100-200mg/Nm3, should Region accounts for 1-2 bellows in sintering machine;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, 150-250 DEG C of sintering flue gas temperature, NOx concentration 100-200mg/Nm3;Tail section is located at the later half of sintering machine Portion, the region account for the 30-40% of sintering machine total length, 250 DEG C of sintering flue gas temperature >, NOx concentration 100mg/Nm3Left and right.
Process example:
Sinter mixture is evenly distributed on the trolley 2.1 of sintering machine 2 through material distributing machine 16, and first preheated dryer section preheating is dry It is dry, subsequently into lighting section be ignited 14 ignition of system, again through flue gas be rapidly heated section heating, finally enter tail Duan Ji Sinter is discharged after continuous sintering;The sintering flue gas generated of burning passes through sintering feed, bottom material, sintering machine under the draft effect of blower Pallet bottom double-edged fine-toothed comb enters multiple bellows below trolley, wherein the sintering flue gas of the tail section is through corresponding below trolley 2.1 Bellows 6 collect after enter high-temperature flue gas flue collector 10, the particulate matter that flue dust is brought into is enriched in fluidized-bed reactor 10, simultaneously The iron series polyoxide being rich in carries out catalytic denitration reaction to the NOx in sintering flue dust, and the flue gas after denitration is again through high-temperature flue gas Deduster 9, high-temperature flue gas circulating fan 9 and high-temperature flue gas circulation pipe 8 are sent into the high temperature being located above the preheating and drying section and are followed In ring flue gas cover 15, sprayed by high temperature circulation flue gas cover 15 to the sintered compound on preheating and drying section trolley as the thermal current Material carries out preheating and drying, while carrying out auxiliary heating by sinter mixture of the microwave heating equipment to preheating and drying section, to protect Card enters preheating and drying section, and flue-gas temperature is at 120-150 DEG C in the 1-2 bellows in lighting section region, i.e. preheating and drying out The temperature of charge of section is at 120-150 DEG C, specifically: temperature sensing can be arranged in the 1-2 bellows 6 of preheating and drying section tail end Device increases microwave applicator 20 when sintering flue gas temperature≤120 DEG C with the temperature for monitoring sintering flue gas in the part bellows 6 Unlatching number and heating power;When sintering flue gas temperature >=150 DEG C in the region bellows 6, microwave applicator 20 is reduced Number and heating power are opened, all microwave applicators 20 are even switched off.
The denitration flue gas is discharged into high-temperature flue gas from the fluidized bed airflow on 23 top of fluidized-bed reactor outlet 23.1 Flue collector 10;As bed resistance >=2000Pa of fluidized-bed reactor 23, the fluidized bed of 23 lower part of fluidized-bed reactor is opened All or part of solid phase is discharged in 23.2 valve of solid-phase outlet 10-30 seconds.
The lighting section and flue gas are rapidly heated after the sintering flue gas that section region generates is corresponded to the collection of bellows 6 and are sent into connection Flue gas flue collector 18, high NOx flue gas recirculation pipe 13, then guided to through high NOx smoke duster 12, high NOx flue gas recirculation blower fan 11 The tail section of sintering machine 2 corresponds in the high NOx circulating flue gas cover 1 of the top of trolley 2.1, from high NOx circulating flue gas cover 1 to tail section Trolley direction spray enter sintering feed in participate in sintering process, pass through multiple air balance pipes on high NOx circulating flue gas cover 1 1.1 introduce the outside air of requirement, to keep the air quantity for entering tail section whole region sinter bed to stablize.
The sintering flue gas of the preheating and drying section corresponds to through lower section and is sent into low-temperature flue gas flue collector 22 after bellows 6 are collected, then It is drawn through low-temperature flue gas pipe 21, electrostatic/bag filter 17 and main exhauster 19 and enters subsequent flue gas desulphurization system.
Sintering flue gas NOx discharge after processing reduces 75%.It is urged using above-mentioned denitrating technique whole process without using outsourcing Agent reduces denitration device investment, simplifies denitrating technique, take full advantage of the waste heat in technical process, energy conservation and consumption reduction effects Obviously, compared with traditional SCR denitration process, denitration cost 60% is reduced, the investment of denitration device is eliminated.

Claims (14)

1. a kind of NOx abatement system based on dry pack ignition sintering, including sintering machine, the trolley lower section of the sintering machine Equipped with bellows, which is characterized in that be divided into preheating and drying section, lighting section, flue gas along trolley direction of travel sintering machine and quickly rise 4 regions of temperature section and tail section, the bellows below the tail section are successively through fluidized-bed reactor, high-temperature flue gas flue collector, height Warm smoke duster, high-temperature flue gas circulating fan and high-temperature flue gas circulation pipe connect the high temperature being located above the preheating and drying section Circulating flue gas cover.
2. as described in claim 1 based on the NOx abatement system of dry pack ignition sintering, which is characterized in that the stream Change bed reaction top and set fluidized bed airflow outlet, lower part sets fluidized bed solid-phase outlet.
3. as described in claim 1 based on the NOx abatement system of dry pack ignition sintering, which is characterized in that described pre- Heated drying section is additionally provided with heating device.
4. as claimed in claim 3 based on the NOx abatement system of dry pack ignition sintering, which is characterized in that described to add Hot charging is set to infrared heating device, microwave heating equipment or electric heater unit.
5. as claimed in claim 4 based on the NOx abatement system of dry pack ignition sintering, which is characterized in that described micro- Wave heating device includes multiple microwave heatings below material distributing machine, being inserted into different depth in sinter mixture on trolley Device.
6. as claimed in claim 5 based on the NOx abatement system of dry pack ignition sintering, which is characterized in that described micro- The waveguide leading portion of wave heater protrudes into 500-1000mm in sinter mixture.
7. as claimed in claim 6 based on the NOx abatement system of dry pack ignition sintering, which is characterized in that described micro- It is horizontally disposed along trolley direction of travel that the waveguide leading portion of wave heater protrudes into the part inside sinter mixture.
8. as described in claim 1 based on the NOx abatement system of dry pack ignition sintering, which is characterized in that described pre- Corresponding bellows outlet is sequentially connected low-temperature flue gas flue collector, low-temperature flue gas pipe, electrostatic/bag filter and master below heated drying section Exhaust fan.
9. such as the described in any item NOx abatement systems based on dry pack ignition sintering of claim 1-8, feature exists High NOx flue gas flue collector, height are sequentially connected in the corresponding bellows outlet below section region that is rapidly heated of, the lighting section and flue gas NOx flue gas recirculation pipe, high NOx smoke duster, high NOx flue gas recirculation blower fan and sintering machine tail section correspond to above trolley High NOx circulating flue gas cover.
10. such as the described in any item NOx abatement systems based on dry pack ignition sintering of claim 1-8, feature exists In at least one layer of liquefied ammonia nozzle is circumferentially installed below the tail section on corresponding bellows side wall.
11. as claimed in claim 10 based on the NOx abatement system of dry pack ignition sintering, which is characterized in that described Liquefied ammonia nozzle is located at the top of the bellows, and circumferentially along bellows side wall, and nozzle ejiction opening tilts upward.
12. as claimed in claim 9 based on the NOx abatement system of dry pack ignition sintering, which is characterized in that the height Multiple air balance pipes are evenly arranged on NOx circulating flue gas cover.
13. as claimed in claim 9 based on the NOx abatement system of dry pack ignition sintering, which is characterized in that the height Warm circulating flue gas cover is mounted on right above preheating and drying section, covers preheating and drying section part or whole region.
14. as described in claim 1 based on the NOx abatement system of dry pack ignition sintering, which is characterized in that described pre- Heated drying section accounts for the 40-50% of sintering machine total length.
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CN108159861A (en) * 2017-12-18 2018-06-15 中南大学 A kind of Whole Process Control reduces the method and its device of sintering flue gas NOx emission
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