CN108895837A - Low NO based on the igniting of double-layer cloth bilayerxSintering system - Google Patents

Low NO based on the igniting of double-layer cloth bilayerxSintering system Download PDF

Info

Publication number
CN108895837A
CN108895837A CN201810244507.XA CN201810244507A CN108895837A CN 108895837 A CN108895837 A CN 108895837A CN 201810244507 A CN201810244507 A CN 201810244507A CN 108895837 A CN108895837 A CN 108895837A
Authority
CN
China
Prior art keywords
layer
sintering
sinter mixture
flue gas
cloth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810244507.XA
Other languages
Chinese (zh)
Inventor
吴高明
陈铁军
许丽娟
付本全
周仙霖
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan University of Science and Engineering WUSE
Wuhan University of Science and Technology WHUST
Wuhan Iron and Steel Co Ltd
Original Assignee
Wuhan University of Science and Engineering WUSE
Wuhan Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan University of Science and Engineering WUSE, Wuhan Iron and Steel Co Ltd filed Critical Wuhan University of Science and Engineering WUSE
Priority to CN201810244507.XA priority Critical patent/CN108895837A/en
Publication of CN108895837A publication Critical patent/CN108895837A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • F27D3/00Charging; Discharging; Manipulation of charge
    • F27D3/0084Charging; Manipulation of SC or SC wafers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27MINDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2003/00Type of treatment of the charge
    • F27M2003/04Sintering

Abstract

The invention discloses a kind of low NO based on the igniting of double-layer cloth bilayerxSintering system comprising the trolley lower section of sintering machine, sintering machine is equipped with bellows;Along trolley direction of travel, sintering machine is divided into lighting section of lower layer's sinter mixture cloth section, upper layer sinter mixture cloth section, regnition section, oxygen-enriched sintering section, tail section;Lower layer's sinter mixture material distributing machine is equipped with above lower layer's sinter mixture cloth section;Sinter mixture material distributing machine in upper layer is equipped with above the sinter mixture cloth section of upper layer;One time lighting section is equipped with lower layer's sinter mixture ignition system;Regnition section is equipped with upper layer sinter mixture ignition system.The present invention reduces NO by using two sets of sinter mixture material distributing machines and two sets of ignition systems from sourcexGeneration, reduce flue gas pollutant treatment cost;Sintering material layer thickness is improved, to improve Sintering Yield.

Description

Low NO based on the igniting of double-layer cloth bilayerxSintering system
Technical field
The invention belongs to Metallurgy Energy Saving environmental technology fields, and in particular to a kind of based on the low of double-layer cloth bilayer igniting NOxSintering system.
Background technique
Selective catalytic reduction denitration efficiency with higher is widely used to coal-fired power plant flue gas NOxIt is de- It removes.But the SCR gas denitrifying technology one-time investment in selective catalytic reduction is at high cost(Wherein catalyst cost accounts for investment The 30-40% of totle drilling cost), and existing SCR gas denitrifying technology generally carries out at 350-450 DEG C, needs to consume big calorimetric It can be heated to flue gas after desulfurization, add additional the operating cost of SCR denitration.In order to save energy consumption, many researchers carry out The research work of low temperature catalyst.But low-temperature denitration catalyst is mostly noble metal, at high cost, and is easily occurred in oxygen inhibition and sulphur Poison.
The Processing tecchnics of existing sintering flue gas pollutant mostly concentrate on the monomer technical unit of single pollutant control Combination, this result in flue gas managing technique there are routes it is long, take up a large area, process control is complicated, investment is big, operating cost is high A series of problems, such as, huge cost pressure is brought to iron and steel enterprise.Especially current more universally recognized SCR denitration technology In application, since sulphur can cause catalyst poisoning in sintering flue gas improvement, desulphurization system is generally arranged in SCR denitration system Afterwards, cause flue-gas temperature to further decrease, be far below SCR denitration temperature window.So in current sintering flue gas SCR denitration engineering In case, need to provide additional energy makes flue gas heating reach SCR denitration temperature window, adds additional denitration cost.Meanwhile SCR denitration contains noble metal, and manufacturing cost is high, and it is big that difficulty is disposed after failure.
Summary of the invention
The purpose of the present invention is to provide a kind of low NO based on the igniting of double-layer cloth bilayerxSintering system, by using Two sets of sinter mixture material distributing machines and two sets of ignition systems, reduce NO from sourcexGeneration, reduce flue gas pollutant and control Manage cost;The thickness for improving sinter mixture, to improve Sintering Yield.
The technical scheme adopted by the invention is that:
A kind of low NO based on the igniting of double-layer cloth bilayerxSintering system, including sintering machine, sintering machine are equipped with sintering bottom material, Bellows are equipped with below the trolley of sintering machine;Along trolley direction of travel, sintering machine is divided into lower layer's sinter mixture cloth section, one Secondary lighting section, upper layer sinter mixture cloth section, regnition section, oxygen-enriched sintering section, tail section;
The lower layer for setting layer sinter mixture on sintering machine upper berth is equipped with above lower layer's sinter mixture cloth section to be sintered Mixture distributor machine, lower layer's sinter mixture material distributing machine is respectively and under lower layer sinter mixture lower hopper, lower layer's sinter mixture Expect gate, the connection of lower layer's sinter mixture feeding chute;
It is equipped with above the upper layer sinter mixture cloth section for being laid with upper layer sinter mixture on lower layer's sinter mixture Upper layer sinter mixture material distributing machine, upper layer sinter mixture material distributing machine respectively with upper layer sinter mixture lower hopper, upper layer burn Tie mixture blanking gate, the connection of upper layer sinter mixture feeding chute;
Lighting section is equipped with lower layer's sinter mixture ignition system for lighting a fire to lower layer's sinter mixture;
The regnition section is equipped with the upper layer sinter mixture ignition system for lighting a fire to upper layer sinter mixture.
According to the above scheme, several sinter mixture cloth sections and point are additionally provided between regnition section, oxygen-enriched sintering section Fiery section, and the corresponding lighting section of a sinter mixture cloth section, form two layers or more clothes and two layers or more ignition sintering. For example third layer dry combustion method knot mixture distributor section, three times lighting section, are successively arranged between regnition section, oxygen-enriched sintering section Four layers of dry combustion method knot mixture distributor section, four-ignition section ... n-th layer dry combustion method knot mixture distributor section, n times lighting section.
According to the above scheme, predrying section is equipped between a lighting section, upper layer sinter mixture cloth section;The predry Dry section of top is equipped with high temperature circulation flue gas cover, and lower layer's sinter mixture cloth section, predrying section, a lighting section, upper layer are burnt Bellows below knot mixture distributor section are connect with single layer sintering flue gas flue collector, and the single layer sintering flue gas flue collector passes through list Layer sintering flue gas pipe is connect with subsequent flue gas purification system, is successively arranged electrostatic/bag-type dust on the single layer sintering flue gas pipe Device, main exhauster;
The top of oxygen-enriched sintering section is equipped with oxygen-enriched air cover, and the air inlet of oxygen-enriched air cover is connect with oxygen-enriched air source;Oxygen-enriched burning Bellows and high NO below knot section, regnition sectionxThe connection of flue gas flue collector, the high NOxFlue gas flue collector passes through high NOxCigarette High NO above gas circulation pipe and tail sectionxThe connection of circulating flue gas cover, meanwhile, high NOxFlue gas flue collector is also and in oxygen-enriched sintering section The oxygen-enriched air cover connection of side;High NOxHigh NO is successively arranged on flue gas recirculation pipexSmoke duster, high NOxFlue gas recirculation blower fan; The sintering flue gas that oxygen-enriched sintering section generates enters the high NO above tail section after region bellows collectionxCirculating flue gas cover carries out It recycles;
Bellows below tail section are connect with fluidized bed, and the fluidized bed airflow outlet and high-temperature flue gas flue collector of fluidized bed connect It connects, high-temperature flue gas flue collector is connected by the air inlet of the high temperature circulation flue gas cover above high-temperature flue gas circulation pipe and predrying section It connects;Dust collector for high-temperature flue, high-temperature flue gas circulating fan are successively arranged on the high-temperature flue gas circulation pipe;The burning that tail section generates It ties flue gas and enters high temperature circulation flue gas cover progress flue gas heat recovery after region bellows collection.
According to the above scheme, at least one layer of nozzle is circumferentially installed on the bellows side wall below tail section, by nozzle to Trolley double-edged fine-toothed comb sprays into liquefied ammonia;The liquefied ammonia emission direction of nozzle is contrary with flow of flue gas or the liquefied ammonia emission direction of nozzle with The angle in flow of flue gas direction is greater than 90 °.The liquefied ammonia that nozzle sprays is directly injected to the bottom above trolley double-edged fine-toothed comb and double-edged fine-toothed comb gap In material, at high temperature, the catalytic action for the ferrous oxide that the gasification of liquefied ammonia droplet mixes with flue dust, and contains in flue dust is issued It survives former denitration reaction;Part liquefied ammonia enters on the sintering bottom material on double-edged fine-toothed comb gap simultaneously, the ferrous oxide contained by bottom material Catalytic action under with the NO in flue gasxCatalytic-reduction denitrified reaction occurs.Because air leak rate of air curtain is low at bellows, NOx concentration is high at this, Therefore be conducive to improve denitration efficiency.
According to the above scheme, the high temperature circulation flue gas cover, laterally covers entire trolley, and cover lower bead is rolled certainly by flexible Sealing is connect with trolley;The 25-30% of longitudinally covered entire sintering machine length;High NOxThe air inlet of circulating flue gas cover can with it is oxygen-enriched Air-source connection, and high NOxCirculating flue gas cover laterally covers entire trolley, and cover lower bead is by flexible from rolling seal and platform Vehicle connection, the 25-30% of longitudinally covered entire sintering machine length;Oxygen-enriched air cover, laterally covers entire trolley, and cover lower bead is logical It crosses flexibility to connect from rolling seal with trolley, the 40-45% of longitudinally covered entire sintering machine length.
According to the above scheme, the coke powder content 4% of lower layer's sinter mixture, particle diameter 5-8mm, sinter mixture cloth Doses accounts for the 50-55% of total cloth doses;The thickness of feed layer of lower layer's sinter mixture is 400-450mm, accounts for entire sintering material layer thickness 50-55%;The coke powder content 4% of upper layer sinter mixture, particle diameter 3-6mm, thickness of feed layer 350-400mm;With Sintering Yield is improved to greatest extent.
According to the above scheme, lower layer's sinter mixture cloth section, predrying section and a lighting section account for entire sintering machine length 25-30%;Oxygen-enriched sintering section accounts for entire sintering machine length 40-45%, and tail section accounts for entire sintering machine length 25-30%.So that entire It is structurally reasonable, to improve Sintering Yield and to save smoke gas treatment cost.
It is equipped in front of lower layer's sinter mixture cloth section for adding to lower layer's sinter mixture on sintering machine The heater of heat.
The beneficial effects of the present invention are:
By using two sets and the above sinter mixture material distributing machine and two sets and the above ignition system, NO is reduced from sourcex Generation;The thickness for improving sinter mixture, to improve Sintering Yield;
The heater of predrying section need to only be dried lower layer's sinter mixture, shorten drying time, and then also improve Sintering Yield;
Take full advantage of flue dust waste heat in tail section bellows, the external world that firing chamber need to supplement when saving sintering flue gas SCR denitration Heat source, not only energy conservation and environmental protection, but also also reduce the control expense of sintering flue gas pollutant;
There is catalytic-reduction denitrified characteristic using iron series polyoxide is rich in flue dust, save sintering flue gas SCR denitration institute The catalyst needed, has saved the control expense of sintering flue gas pollutant;
The online denitration in bellows saves newly-built denitration device investment, reduces denitration facility occupied area, save denitration Cost;
The ingredient that the present invention makes full use of lower layer's high-temp combustion band itself to contain reducing catalyst effect, it is sharp during the sintering process Use lower layer's high temperature sinter as denitrating catalyst effectively to the NO generated in the sintering process of upper layerxCatalysis reduction is carried out, and It is sintered online progress synchronous with denitration, the demand of sintering efficiency and catalyst is ensure that, greatly reduces the denitration of sintering process Cost.
The present invention is while using sintered discharge gas waste heat, since upper layer sintering flue gas temperature is higher, CO therein etc. Combustible component can also be fully utilized, and the preheating and drying for lower layer's sinter mixture provides heat, make full use of sintering waste heat, To save the consumption of solid fuel;
The present invention utilizes the hot environment of lower layer's combustion zone, and upper layer sintering process is generated bioxin and NOxThermal decomposition to Its concentration of emission is reduced, while dust is also partly absorbed and is retained in sinter, to improve efficiency of dust collection, is conducive to ring Border protection;
The present invention makes full use of sinter waste heat, it is no longer necessary to which additional heating device is to flue gas, due to lower layer's sinter temperature Spend it is higher, before on upper layer, excessive moistening layer terminates, when upper layer sintering flue gas enters lower layer, flue gas first through lower layer's sinter heat temperature raising, It totally can achieve 200 DEG C or more, fully meet the temperature requirement of denitration catalyst reaction in this temperature range, denitration can be saved The cost of investment of process.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the structural schematic diagram of the embodiment of the present invention;
Wherein:1-1, upper layer sinter mixture, 1-2, lower layer's sinter mixture, 1-3, sintering bottom material, 2-1, high NOxCirculating flue gas Cover, 2-2, oxygen-enriched air cover, 2-3, high temperature circulation flue gas cover, 3, sintering machine, 3.1, trolley, 4, nozzle, 5, ammonium hydroxide, 6, stream Change bed, 6.1, fluidized bed airflow outlet, 6.2, fluidized bed solid-phase outlet pipe, 7, high-temperature flue gas circulation pipe, 8, high-temperature flue gas follows Ring blower, 9, dust collector for high-temperature flue, 10, high-temperature flue gas flue collector, 11, high NOxFlue gas recirculation blower fan, 12, high NOxFlue gas master Flue, 13, high NOxSmoke duster, 14, high NOxFlue gas recirculation pipe, 15-1, lower layer's sinter mixture ignition system, 15-2, on Layer sinter mixture ignition system, 16-1, lower layer's sinter mixture feeding chute, 16-2, upper layer sinter mixture feeding chute, 17-1, lower layer's sinter mixture lower hopper, 17-2, upper layer sinter mixture lower hopper, 18-1, lower layer's sinter mixture blanking lock Door, 18-2, upper layer sinter mixture blanking gate, 19-1, lower layer's sinter mixture material distributing machine, 19-2, upper layer sinter mixture Material distributing machine, 20, microwave applicator, 20.1, microwave power source, 20.2, waveguide, 21, bellows, 22, single layer sintering flue gas pipe, 23, single layer sintering flue gas flue collector, 24, electrostatic/bag filter, 25, main exhauster.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not For limiting the present invention.
Embodiment 1, referring to Fig. 1, a kind of low NO based on the igniting of double-layer cloth bilayerxSintering system, including sintering machine 3, Sintering machine 3 is equipped with sintering bottom material 1-3, is equipped with bellows 21 below the trolley 3.1 of sintering machine 3.Along trolley direction of travel, sintering machine 3 are divided into lower layer's sinter mixture cloth section, predrying section, a lighting section, upper layer sinter mixture cloth section, secondary point Fiery section, oxygen-enriched sintering section, tail section.It is equipped with above lower layer's sinter mixture cloth section for setting layer on 3 upper berth of sintering machine The lower layer sinter mixture material distributing machine 19-1 of sinter mixture 1-2, lower layer sinter mixture material distributing machine 19-1 are burnt with lower layer respectively Tie mixture lower hopper 17-1, lower layer sinter mixture blanking gate 18-1, lower layer's sinter mixture feeding chute 16-1 connection. It is equipped with above the sinter mixture cloth section of upper layer for being laid with upper layer sinter mixture 1-1's on lower layer sinter mixture 1-2 Upper layer sinter mixture material distributing machine 19-2, upper layer sinter mixture material distributing machine 19-2 respectively with upper layer sinter mixture lower hopper 17-2, upper layer sinter mixture blanking gate 18-2, upper layer sinter mixture feeding chute 16-2 connection.In lower layer's sintered compound Expect to be equipped with the microwave applicator 20 for heating the lower layer sinter mixture 1-2 on sintering machine 3, microwave in front of cloth section Heater 20 includes microwave heating source 20.1 and waveguide 20.1, and waveguide 20.1 is inserted into lower layer's sinter mixture 1-2.Predry Dry section of top is equipped with high temperature circulation flue gas cover 2-3.One time lighting section is equipped with for carrying out a little to lower layer sinter mixture 1-2 The lower layer sinter mixture ignition system 15-1 of fire.Regnition section is equipped with for carrying out a little to upper layer sinter mixture 1-1 The upper layer sinter mixture ignition system 15-2 of fire.Lower layer's sinter mixture cloth section, predrying section, lighting section, a upper layer Bellows 21 below sinter mixture cloth section are connect with single layer sintering flue gas flue collector 23, and single layer sintering flue gas flue collector 23 is logical Cross single layer sintering flue gas pipe 22 and subsequent flue gas purification system(Into flue gas desulphurization system)Connection, on single layer sintering flue gas pipe 22 according to It is secondary to be equipped with electrostatic/bag filter 24, main exhauster 25.The top of oxygen-enriched sintering section is equipped with oxygen-enriched air cover 2-2, oxygen-enriched air The air inlet of cover 2-2 is connect with oxygen-enriched air source;Bellows 21 and high NO below oxygen-enriched sintering section, regnition sectionxFlue gas master Flue 12 connects, high NOxFlue gas flue collector 12 passes through high NOxHigh NO above flue gas recirculation pipe 14 and tail sectionxCirculating flue gas cover 2-1 connection, high NOxThe air inlet of circulating flue gas cover 2-1 is connect with oxygen-enriched air source;High NOxFlue gas flue collector 12 passes through high NOx Flue gas recirculation pipe 14 is also connect with the air inlet of oxygen-enriched air cover 2-2, high NOxHigh NO is successively arranged on flue gas recirculation pipe 14xFlue gas Deduster 13, high NOxFlue gas recirculation blower fan 11;The sintering flue gas that oxygen-enriched sintering section generates enters after the region bellows 21 collection High NO above tail sectionxCirculating flue gas cover 2-1, then recycle simultaneously heat recovery through sinter bed, meanwhile, there are also portions The sintering flue gas for dividing oxygen-enriched sintering section to generate enters oxygen-enriched air cover 2-2 after the region bellows 21 collection, oxygen-enriched with being passed through Air mixing is again introduced into sinter bed.Bellows 21 below tail section are connect with fluidized bed 6, and fluidized bed 6 includes fluidized bed gas Outflux pipe 6.1, fluidized bed solid-phase outlet pipe 6.2, fluidized bed airflow outlet 6.1 is connect with high-temperature flue gas flue collector 10, high The air inlet that warm flue gas flue collector 10 passes through high-temperature flue gas circulation pipe 7 and the high temperature circulation flue gas cover 2-3 of the top of predrying section It connects, is successively arranged dust collector for high-temperature flue 9, high-temperature flue gas circulating fan 8 on high-temperature flue gas circulation pipe 7;Tail section generates Sintering flue gas through the region bellows 21 collection after enter high temperature circulation flue gas cover 2-3 be recycled.
Denitration efficiency in order to better improve can circumferentially install at least one on the side wall of the bellows 21 below tail section Layer nozzle 4;The liquefied ammonia emission direction of nozzle 4 is contrary with flow of flue gas or the liquefied ammonia emission direction and flow of flue gas of nozzle 4 The angle in direction is greater than 90 °.The liquefied ammonia that nozzle 4 sprays is directly injected to the sintering bottom material 1- above trolley double-edged fine-toothed comb and double-edged fine-toothed comb gap In 3, at high temperature, the catalytic action for the ferrous oxide that the gasification of liquefied ammonia droplet mixes with flue dust, and contains in flue dust is issued It survives former denitration reaction;Part liquefied ammonia enters on the sintering bottom material 1-3 on double-edged fine-toothed comb gap simultaneously, contained by sintering bottom material 1-3 Under the catalytic action of ferrous oxide with the NO in flue gasxCatalytic-reduction denitrified reaction occurs.
In order to preferably utilize fume afterheat, high temperature circulation flue gas cover 2-3 is made laterally to cover entire trolley 3.1, cover lower edge Mouth is connect from rolling seal with trolley 3.1 by flexibility;The 25-28% of longitudinally covered 3 length of entire sintering machine;High NOxRecycle cigarette Gas hood 2-1 laterally covers entire trolley, and cover lower bead is connect from rolling seal with trolley 3.1 by flexibility.
In order to improve Sintering Yield to greatest extent, it is mixed that the coke powder content of lower layer sinter mixture 1-2 accounts for lower layer's sintering The 4% of material is closed, particle diameter 5-8mm, sinter mixture cloth doses accounts for the 50-55% of total cloth doses;Lower layer's sinter mixture The thickness of feed layer of 1-2 is 400-450mm, accounts for the 50-55% of entire sintering material layer thickness;The coke powder of upper layer sinter mixture 1-1 contains Amount accounts for the 4% of upper layer sinter mixture 1-1, particle diameter 3-6mm, thickness of feed layer 350-400mm.
In the present invention, lower layer's sinter mixture cloth section, predrying section, a lighting section and upper layer sinter mixture cloth Material section accounts for entire 3 length 26-30% of sintering machine;Oxygen-enriched sintering section accounts for entire 3 length 40-45% of sintering machine, and tail section accounts for entire burning 3 length 25-30% of knot machine.
With 450m2For sintering machine:
First raw materials for sintering is mixed well, adds water mixed pelletization, carries out first time cloth, lower layer's sinter mixture coke powder content 4%, particle diameter 5-8mm, cloth doses account for the 50-55% of total cloth doses, thickness of feed layer 400-450mm;
Predrying is carried out to well laid lower layer's sinter mixture using tail section flue gas, removes and carries out the after partial moisture therein Ignition sintering, sintering negative pressure are 6KPa;
After lower layer's sinter mixture ignition sintering, second of cloth, upper layer sinter mixture coke powder content 4%, particle diameter are carried out For 3-6mm, upper layer sinter mixture cloth doses accounts for the 45-50%, thickness of feed layer 350-400mm of total cloth doses;
Cloth finishes second of progress and lights a fire, and carries out oxygen-enriched down draft sintering, oxygen concentration 26-36%, and sintering negative pressure is 10KPa;Sintering terminates, and obtains sinter, during the sintering process, NOxDischarge amount reduces 35% or so compared to normal sintering.
The present embodiment using lower layer's high temperature sinter as denitrating catalyst effectively to the NO generated in sintering processxInto Row catalysis reduction, compared with conventional sintering technique, the sintering process of same thickness, the present invention can reduce by 30 ~ 60% NOxDischarge Amount, and online progress synchronous with denitration is sintered in the present invention, it ensure that the demand of sintering efficiency and catalyst, improve sintering life Efficiency is produced, denitration facility investment is saved, greatly reduces the denitration cost of sintering process.
The present embodiment also uses sinter mixture and is in different temperatures section to NO in flue gasxCatalysis reducing power not Same characteristic changes proportion scheme and sintering schedule, and assists flue gas recirculation, and the catalytic temperature window for creating sintering ore bed is realized Sintering process denitration realizes the coupling of sintering flue gas waste heat recycling and denitrating flue gas, improves smoke gas treatment efficiency, also reduce Smoke gas treatment cost.
Embodiment 2, a kind of low NO based on the igniting of double-layer cloth bilayerxSintering system, including sintering machine are set on sintering machine There is sintering bottom material, is equipped with bellows below the trolley of sintering machine, flue gas is discharged bellows;Along trolley direction of travel, sintering machine is successively It is divided into lower layer's sinter mixture cloth section, a lighting section, upper layer sinter mixture cloth section, regnition section, oxygen-enriched sintering Section, tail section;It is equipped with above lower layer's sinter mixture cloth section for being set under layer sinter mixture on sintering machine upper berth Layer sinter mixture material distributing machine, lower layer's sinter mixture material distributing machine are mixed with lower layer sinter mixture lower hopper, lower layer's sintering respectively Close material blanking gate, the connection of lower layer's sinter mixture feeding chute;It is equipped with above the sinter mixture cloth section of upper layer under The upper layer sinter mixture material distributing machine of upper layer sinter mixture, upper layer sinter mixture material distributing machine point are laid on layer sinter mixture It is not connect with upper layer sinter mixture lower hopper, upper layer sinter mixture blanking gate, upper layer sinter mixture feeding chute;One Secondary lighting section is equipped with lower layer's sinter mixture ignition system for lighting a fire to lower layer's sinter mixture;Regnition section It is equipped with the upper layer sinter mixture ignition system for lighting a fire to upper layer sinter mixture.
Embodiment 3, with embodiment 2 the difference is that being additionally provided with several sintering between regnition section, oxygen-enriched sintering section Mixture distributor section and lighting section, and the corresponding lighting section of a sinter mixture cloth section.
The present invention has system simple, energy conservation and environmental protection, saves pollutant control cost of investment, and can be effectively reduced sintering NO in the processxThe characteristics of, bioxin and dust emission concentration.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description, And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.

Claims (10)

1. a kind of low NO based on the igniting of double-layer cloth bilayerxThe trolley lower section of sintering system, including sintering machine, sintering machine is equipped with Bellows;It is characterized in that:Along trolley direction of travel, sintering machine be divided into lower layer's sinter mixture cloth section, a lighting section, Upper layer sinter mixture cloth section, regnition section, oxygen-enriched sintering section, tail section;
The lower layer for setting layer sinter mixture on sintering machine upper berth is equipped with above lower layer's sinter mixture cloth section to be sintered Mixture distributor machine;
It is equipped with above the upper layer sinter mixture cloth section for being laid with upper layer sinter mixture on lower layer's sinter mixture Upper layer sinter mixture material distributing machine;
Lighting section is equipped with lower layer's sinter mixture ignition system for lighting a fire to lower layer's sinter mixture;
The regnition section is equipped with the upper layer sinter mixture ignition system for lighting a fire to upper layer sinter mixture.
2. the low NO according to claim 1 based on the igniting of double-layer cloth bilayerxSintering system, it is characterised in that:Secondary Several sinter mixture cloth sections and lighting section, and a sinter mixture cloth are additionally provided between lighting section, oxygen-enriched sintering section The corresponding lighting section of section, forms two layers or more clothes and two layers or more ignition sintering.
3. the low NO according to claim 1 based on the igniting of double-layer cloth bilayerxSintering system, it is characterised in that:Primary Predrying section is equipped between lighting section, upper layer sinter mixture cloth section;
The top of the predrying section is equipped with high temperature circulation flue gas cover, lower layer's sinter mixture cloth section, predrying section, primary point Bellows below fiery section, upper layer sinter mixture cloth section are connect with single layer sintering flue gas flue collector, the single layer sintering flue gas Flue collector is connect with single layer sintering flue gas pipe;
The top of oxygen-enriched sintering section is equipped with oxygen-enriched air cover, and the air inlet of oxygen-enriched air cover is connect with oxygen-enriched air source;Oxygen-enriched burning Bellows and high NO below knot section, regnition sectionxThe connection of flue gas flue collector, the high NOxFlue gas flue collector passes through high NOxCigarette High NO above gas circulation pipe and tail sectionxThe connection of circulating flue gas cover;Meanwhile high NOxFlue gas flue collector is also and in oxygen-enriched sintering section The oxygen-enriched air cover connection of side;
Bellows below tail section are connect with fluidized bed, and the fluidized bed airflow outlet and high-temperature flue gas flue collector of fluidized bed connect It connects, high-temperature flue gas flue collector is connect by high-temperature flue gas circulation pipe with the high temperature circulation flue gas cover above predrying section.
4. the low NO according to claim 3 based on the igniting of double-layer cloth bilayerxSintering system, it is characterised in that:In tail At least one layer of nozzle is circumferentially installed on the bellows side wall of section lower section, liquefied ammonia is sprayed into trolley double-edged fine-toothed comb by nozzle.
5. the low NO according to claim 4 based on the igniting of double-layer cloth bilayerxSintering system, it is characterised in that:Nozzle Liquefied ammonia emission direction is contrary with flow of flue gas or the liquefied ammonia emission direction of nozzle and the angle in flow of flue gas direction are greater than 90°。
6. the low NO according to claim 3 based on the igniting of double-layer cloth bilayerxSintering system, it is characterised in that:The height Warm circulating flue gas cover, laterally covers entire trolley, and cover lower bead is connect from rolling seal with trolley by flexibility;It is longitudinally covered whole The 25-30% of a sintering machine length.
7. the low NO according to claim 3 based on the igniting of double-layer cloth bilayerxSintering system, it is characterised in that:High NOx The air inlet of circulating flue gas cover is connect with oxygen-enriched air source, and, the high NOxCirculating flue gas cover laterally covers entire trolley, cover Lower bead is connect from rolling seal with trolley by flexibility, the 25-30% of longitudinally covered entire sintering machine length;Oxygen-enriched air cover, Entire trolley is laterally covered, cover lower bead is connect from rolling seal with trolley by flexibility, longitudinally covered entire sintering machine length 40-45%.
8. the low NO according to claim 1 based on the igniting of double-layer cloth bilayerxSintering system, it is characterised in that:Lower layer burns The coke powder content 4% of mixture, particle diameter 5-8mm are tied, sinter mixture cloth doses accounts for the 50-55% of total cloth doses, expects Layer is with a thickness of 400-450mm.
9. the low NO based on the igniting of double-layer cloth bilayer according to claim 1 or 8xSintering system, it is characterised in that:On The coke powder content 4% of layer sinter mixture, particle diameter 3-6mm, thickness of feed layer 350-400mm.
10. the low NO according to claim 3 based on the igniting of double-layer cloth bilayerxSintering system, it is characterised in that:Lower layer Sinter mixture cloth section, predrying section and a lighting section account for entire sintering machine length 25-30%.
CN201810244507.XA 2018-03-23 2018-03-23 Low NO based on the igniting of double-layer cloth bilayerxSintering system Pending CN108895837A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810244507.XA CN108895837A (en) 2018-03-23 2018-03-23 Low NO based on the igniting of double-layer cloth bilayerxSintering system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810244507.XA CN108895837A (en) 2018-03-23 2018-03-23 Low NO based on the igniting of double-layer cloth bilayerxSintering system

Publications (1)

Publication Number Publication Date
CN108895837A true CN108895837A (en) 2018-11-27

Family

ID=64342235

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810244507.XA Pending CN108895837A (en) 2018-03-23 2018-03-23 Low NO based on the igniting of double-layer cloth bilayerxSintering system

Country Status (1)

Country Link
CN (1) CN108895837A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5337103A (en) * 1976-09-17 1978-04-06 Nippon Steel Corp Operation method for restraining no# in sintering
CN1086266A (en) * 1992-08-20 1994-05-04 新日本制铁株式会社 Sintering mine making method and manufacturing installation
JP2013023730A (en) * 2011-07-20 2013-02-04 Nippon Steel & Sumitomo Metal Corp Method for producing sintered ore
CN205119810U (en) * 2015-08-21 2016-03-30 上海梅山钢铁股份有限公司 Oxygen boosting jetting sintering device based on combustible gas assists sintering
CN106350665A (en) * 2016-09-12 2017-01-25 鞍钢股份有限公司 Ultra-thick bed sintering method for reducing sinter return ratio and employing presintering
CN107314677A (en) * 2017-08-10 2017-11-03 武汉钢铁有限公司 NOx abatement system based on dry pack igniting sintering

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5337103A (en) * 1976-09-17 1978-04-06 Nippon Steel Corp Operation method for restraining no# in sintering
CN1086266A (en) * 1992-08-20 1994-05-04 新日本制铁株式会社 Sintering mine making method and manufacturing installation
JP2013023730A (en) * 2011-07-20 2013-02-04 Nippon Steel & Sumitomo Metal Corp Method for producing sintered ore
CN205119810U (en) * 2015-08-21 2016-03-30 上海梅山钢铁股份有限公司 Oxygen boosting jetting sintering device based on combustible gas assists sintering
CN106350665A (en) * 2016-09-12 2017-01-25 鞍钢股份有限公司 Ultra-thick bed sintering method for reducing sinter return ratio and employing presintering
CN107314677A (en) * 2017-08-10 2017-11-03 武汉钢铁有限公司 NOx abatement system based on dry pack igniting sintering

Similar Documents

Publication Publication Date Title
CN105135895B (en) A kind of selective sintering flue gas segmented comprehensive processing technique
CN104764340A (en) Flue gas circulation system and method for sintering machine flue gas recirculation denitration
CN107314677B (en) NOx abatement system based on dry pack ignition sintering
CN108704463A (en) A kind of sintering flue gas desulfurization denitration, flue gas disappear white total system and technique
CN104403697A (en) Flue gas emission pollutant control process device for coal-fired boiler in power plant and control method
CN108895837A (en) Low NO based on the igniting of double-layer cloth bilayerxSintering system
CN109078467A (en) Sintering flue gas dedusting denitrification integral process
CN104748572A (en) Oxidizing-absorbing type wet denitration system and method for smoke of sintering machine
CN104772014A (en) Combined denitration device for flue gas of cement rotary kiln and denitration technology for flue gas
CN107456863B (en) Online denitration process based on sintering flue gas multistage circulation
CN106642085A (en) Staged combustion technology for achieving efficient combustion of fire-retardant coal in pre-decomposition kiln and low NOx emission
CN208583169U (en) A kind of sintering flue gas desulfurization denitration, flue gas disappear white total system
CN107238297B (en) Sintering flue gas sub-prime directed circulation and online denitrating system
CN207600229U (en) A kind of sinter cooling and sintering flue gas cogeneration denitration integrated device
CN205850566U (en) Industrial furnace burning, denitrification integral system
CN108704464A (en) A kind of sintering flue gas desulfurization denitration, flue gas disappear white total system and technique
CN107349783B (en) Sintering flue gas denitration process based on sintering flue gas circulation and flue gas catalysis
CN110273065A (en) A kind of iron ore microwave sintering method
CN107504825B (en) The sintering process that low NOx is generated
CN107413193B (en) Sintering flue gas zoned circulating smoke catalytic denitration process
CN107198944A (en) Sintering flue gas self-catalysis denitrating technique based on bellows flue dust UTILIZATION OF VESIDUAL HEAT IN
CN213747933U (en) Grate-kiln pelletizing flue gas circulation processing system
CN106512687A (en) Powdered coal industrial boiler flue gas denitrifying system and denitrifying method
CN213335589U (en) Pellet flue gas circulation coupling treatment system of chain grate machine, rotary kiln and circular cooler
CN206404591U (en) Granule materials Industrial Boiler flue gas denitrification system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20181127

RJ01 Rejection of invention patent application after publication