CN109569183A - A kind of bi serie sintering system smoke comprehensive circulation process method and processing unit - Google Patents

A kind of bi serie sintering system smoke comprehensive circulation process method and processing unit Download PDF

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Publication number
CN109569183A
CN109569183A CN201910001940.5A CN201910001940A CN109569183A CN 109569183 A CN109569183 A CN 109569183A CN 201910001940 A CN201910001940 A CN 201910001940A CN 109569183 A CN109569183 A CN 109569183A
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sintering
flue gas
machine
flue
fan housing
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CN109569183B (en
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周志安
李康
周晓青
代友训
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Zhongye Changtian International Engineering Co Ltd
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Zhongye Changtian International Engineering Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D49/00—Separating dispersed particles from gases, air or vapours by other methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/68—Halogens or halogen compounds
    • B01D53/70—Organic halogen compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8628—Processes characterised by a specific catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8631—Processes characterised by a specific device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/20—Halogens or halogen compounds
    • B01D2257/206—Organic halogen compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/302—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds

Abstract

A kind of bi serie sintering system smoke comprehensive round-robin method, method includes the following steps: 1) sintering process: raw material is sintered generation sintering gas in sintering machine；2) cooling procedure: sintered raw material is cooling in ring cold machine；3) fume treatment: sintering gas is after through dust-extraction unit, and into system for desulfuration and denitration processing, A sintering system uses active carbon desulfurization denitrating system, and B system uses wet desulphurization denitrating system；Wherein, the sintering flue gas of A sintering system separates two circulation bronchials and each leads into the sintering machine of A sintering system and the sintering machine of B sintering system.The object of the present invention is to improve the concentration of sulfide in dry desulfurization denitrating system, the concentration of nitride is reduced, is conducive to dry desulfurization denitration；Simultaneously in wet desulphurization denitrating system, the concentration of sulfide and nitride is reduced, wet desulphurization denitration is conducive to；To reduce the energy consumption in industrial production, production cost is saved.

Description

A kind of bi serie sintering system smoke comprehensive circulation process method and processing unit
Technical field
The present invention relates to a kind of sintering system flue gas recirculation methods, and in particular to a kind of bi serie sintering system smoke comprehensive Round-robin method belongs to sintering flue gas processing technology field.
Background technique
If sinter is used for blast furnace ironmaking as steel sintering factory owner produces sinter.In steel sintering factory, mainly Process is that the raw materials such as iron ore concentrate, flux, fuel carry out ingredient, is then mixed and is pelletized, is burnt subsequently into sintering machine Knot, obtains sinter after crushing and screening after sintering.In sintering, air is pumped into from sintering machine top by sintering by blower It is sintered in machine material with the ignited fuel in material, is sintered the flue gas of generation and is taken away by blower, through the wind under sintering machine Case, large flue, deduster to system for desulfuration and denitration, flue gas outlet after desulphurization denitration.
With the development of industry and modern construction, also increasing to the throughput requirements of steel plant, blast furnace is also more next Bigger, corresponding blast furnace is also increasing to sinter demand, with previous sintering machine for a blast furnace, typically now wants two Platform sintering machine supplies a blast furnace.Sintering plant bi serie sintering system is more and more, and bi serie sintering system is generally side by side Two sintering machines, other than sharing same raw material mixing system, general every sintering machine has the smoke processing system of oneself by oneself, Processing system is generally outlet after respective desulphurization denitration.
And different desulphurization denitration processing methods, such as dry desulfurization denitration and wet desulphurization denitration, in sintering flue gas Various concentration sulfur and nitrogen oxides, the removal efficiency shown have significant difference.It sends out in the actual production process Existing, in dry desulfurization denitrification process, sulfide in flue gas concentration is higher in unit volume, and sulfide molecules and active carbon collide The probability of absorption is bigger, i.e., sulfide is easier to be tightly held by activated carbon, thus improve in adsorption tower the adsorption efficiency of active carbon and The removal efficiency of sulfide saves production cost；In wet desulphurization denitrification process, the concentration of sulfide in flue gas is lower, urges Agent demand is few, and water consumption is few, and pollutant discharge is few, and pollutant control is at low cost, saves production cost.
To sum up, existing bi serie sintering system handles sintering flue gas using free-standing sintering device flue gas processing system, not Maximum removal efficiency can be reached, there are also great rooms for promotion.
The flue gas that sintering process generates is major pollutants in sintering plant, as environmental requirement is higher and higher, fume treatment It is particularly important.Especially present bi serie sintering system, since yield is big, the exhaust gas volumn of generation is also big, corresponding flue gas Middle harmful substance is more, and so, environmentally friendly cost is also just higher and higher, and investment also increases, and energy consumption also increases.Therefore, such as The flue gas of the processing bi serie sintering system of what low cost, becomes current techniques research emphasis.
Summary of the invention
In view of the above shortcomings of the prior art, it is an object of the present invention in bi serie sintering system, active carbon will be used System for desulfuration and denitration partially sinters flue gas recirculation extremely, and the flue gas of active carbon desulfurization denitrating system and wet desulphurization denitrating system follows In ring cover.To improve the concentration of sulfide, reduce the concentration of nitride, be conducive to do in active carbon desulfurization denitrating system Method desulphurization denitration；Simultaneously in wet desulphurization denitrating system, the concentration of sulfide and nitride is reduced, reduce operating cost and is given up Expect treatment cost；To reduce the energy consumption in industrial production, production cost is saved.The present invention provides a kind of bi serie sintering system Smoke comprehensive round-robin method, method includes the following steps: 1) sintering process: raw material is sintered generation sintering gas in sintering machine 2) cooling procedure: sintered raw material is cooling in ring cold machine；3) fume treatment: being sintered gas after through dust-extraction unit, into Enter system for desulfuration and denitration processing, A sintering system uses active carbon desulfurization denitrating system, and B system uses wet desulphurization denitrating system； Wherein, the sintering flue gas of A sintering system separates sintering machine and the B sintering that two circulation bronchials each lead into A sintering system The sintering machine of system.
The first embodiment according to the present invention provides a kind of bi serie sintering system smoke comprehensive round-robin method:
A kind of bi serie sintering system smoke comprehensive circulation process method, the sintering system include A sintering system and B sintering System, method includes the following steps:
1) sintering process: sintering feed is respectively charged on the sintering machine in A sintering system and B sintering system, then by setting Set the ignition furnace in sintering machine front and ignition carried out to the sintering feed on sintering machine, be re-introduced into the hot wind from ring cold machine into The combustion-supporting sintering of row；Air (at least part) above sintering machine is by the master of main exhauster A, B sintering system of A sintering system Exhaust fan B is pumped into the sintering feed on sintering machine (again) each independently；The flue gas that sintering machine generates in A sintering system enters The flue gas that sintering machine generates in large flue A, B sintering system in A sintering system enters the large flue B in B sintering system；
2) cooling procedure: entering ring cold machine and cooled down by the mineral aggregate that sintering machine completes sintering process, cooling gas with It is cooled down by the sintered mineral aggregate of sintering machine by heat exchange；
3) fume treatment: the flue gas in large flue A is delivered to after main exhauster A by the first smoke conveying duct Active carbon desulfurization denitrating system carries out desulphurization denitration processing；Flue gas in large flue B passes through the second cigarette after main exhauster B Letter shoot road is delivered to wet desulphurization denitrating system and carries out desulphurization denitration processing；
Wherein: for the flue gas in large flue A after main exhauster A, the first smoke conveying duct separates two branches, wherein The first branch is connected in the flue gas recirculation fan housing of sintering machine in A sintering system, and second branch is connected in B sintering system and is sintered In the flue gas recirculation fan housing of machine；Flue gas in large flue A is transported to:
1. active carbon desulfurization denitrating system carries out desulphurization denitration processing,
2. in A sintering system in the flue gas recirculation fan housing of sintering machine, for the sintering of sintering machine in A sintering system,
3. the sintering in B sintering system in the flue gas recirculation fan housing of sintering machine, for sintering machine in B sintering system.
Preferably, 40-90 (vol) % in flue gas in large flue A is transported to active carbon desulfurization denitrating system；It is excellent It is selected as 45-85 (vol) % and is transported to active carbon desulfurization denitrating system；More preferably 50-80 (vol) % is transported to active carbon System for desulfuration and denitration.
Preferably, 5-40 (vol) % in flue gas in large flue A is transported to the cigarette of sintering machine in A sintering system Gas recycles in fan housing；Preferably 10-35 (vol) % is transported in the flue gas recirculation fan housing of sintering machine in A sintering system；It is more excellent 15-30 (vol) % is selected as to be transported in the flue gas recirculation fan housing of sintering machine in A sintering system.
Preferably, 5-40 (vol) % in flue gas in large flue A is transported to the cigarette of sintering machine in B sintering system Gas recycles in fan housing；Preferably 10-35 (vol) % is transported in the flue gas recirculation fan housing of sintering machine in B sintering system；It is more excellent 15-30 (vol) % is selected as to be transported in the flue gas recirculation fan housing of sintering machine in B sintering system.
Preferably, the gas of ring cold machine low-temperature zone discharge passes through flue gas in the flue gas of first branch conveying, A sintering system It is transported in the flue gas recirculation fan housing of sintering machine in A sintering system after mixer A mixing.
Preferably, the gas of ring cold machine low-temperature zone discharge passes through flue gas in the flue gas of second branch conveying, B sintering system It is transported in the flue gas recirculation fan housing of sintering machine in B sintering system after mixer B mixing.
Preferably, the flue gas in large flue A is after deduster A dedusting, it is defeated by the first flue gas by main exhauster A Pipeline to active carbon desulfurization denitrating system is sent to carry out desulphurization denitration processing.
Preferably, the deduster A is electric precipitator.
Preferably, after smoke duster B dedusting in large flue B, by being conveyed after main exhauster B by the second flue gas Pipeline to wet desulphurization denitrating system carries out desulphurization denitration processing；Preferably, the deduster B is electric precipitator.
Preferably, the gas of ring cold machine low-temperature zone discharge passes through flue gas in the flue gas of first branch conveying, A sintering system After mixer A mixing, mixed gas A is obtained；Oxygen content in mixed gas A is more than or equal to 17% (vol), preferably greater than etc. In 17.5% (vol), more preferably higher than it is equal to 18% (vol).
Preferably, the gas of ring cold machine low-temperature zone discharge passes through flue gas in the flue gas of second branch conveying, B sintering system After mixer B mixing, mixed gas B is obtained；Oxygen content in mixed gas B is more than or equal to 17% (vol), preferably greater than etc. In 17.5% (vol), more preferably higher than it is equal to 18% (vol).
Preferably, being equipped with ammonia injection apparatus A in flue gas mixer A, ammonia injection apparatus A sprays ammonia, is mixed into Enter mixed gas A, mixed gas A is transported in the flue gas recirculation fan housing of sintering machine in A sintering system, in mixed gas A NOxSCR denitration reaction occurs in the flue gas recirculation fan housing of sintering machine with ammonia.
Preferably, being equipped with ammonia injection apparatus B in flue gas mixer B, ammonia injection apparatus B sprays ammonia, is mixed into Enter mixed gas B, mixed gas B is transported in the flue gas recirculation fan housing of sintering machine in B sintering system, in mixed gas B NOxSCR denitration reaction occurs in the flue gas recirculation fan housing of sintering machine with ammonia.
Second of embodiment according to the present invention provides a kind of bi serie sintering system smoke comprehensive circulator.
A kind of bi serie sintering system smoke comprehensive cyclic processing device or for being followed described in the first embodiment The device of ring processing method, the device include A sintering system and B sintering system；Wherein A sintering system includes that sintering machine A, ring are cold Machine A, main exhauster A, active carbon desulfurization denitrating system；B sintering system includes sintering machine B, ring cold machine B, main exhauster B, wet process System for desulfuration and denitration.
The bellows of sintering machine A are connected to large flue A by wind box branch pipe A, and large flue A is connected by the first smoke conveying duct It is connected to active carbon desulfurization denitrating system, the low-temperature zone gas vent of ring cold machine A is connected to sintering by third smoke conveying duct In the flue gas recirculation fan housing of machine A；First smoke conveying duct is equipped with main exhauster A.
The bellows of sintering machine B are connected to large flue B by wind box branch pipe B, and large flue B is connected by the second smoke conveying duct It is connected to wet desulphurization denitrating system, the low-temperature zone gas vent of ring cold machine B is connected to sintering machine B by the 4th smoke conveying duct Flue gas recirculation fan housing in；Second smoke conveying duct is equipped with main exhauster B.
Wherein: the first smoke conveying duct separates two branches, and wherein the first branch is connected to the flue gas recirculation of sintering machine A In fan housing, second branch is connected in the flue gas recirculation fan housing of sintering machine B；The first branch be equipped with circulating fan A1, second Road is equipped with circulating fan B1.
Preferably, the device further includes flue gas mixer A, the end of the first branch is connected to flue gas mixer A, third The end of smoke conveying duct is connected to flue gas mixer A, and the gas vent of flue gas mixer A is connected to the flue gas of sintering machine A It recycles in fan housing.
Preferably, third smoke conveying duct is equipped with circulating fan A2.
Preferably, the device further includes flue gas mixer B, the end of second branch is connected to flue gas mixer B, the 4th The end of smoke conveying duct is connected to flue gas mixer B, and the gas vent of flue gas mixer B is connected to the flue gas of sintering machine B It recycles in fan housing.
Preferably, the 4th smoke conveying duct is equipped with circulating fan B2.
Preferably, the first smoke conveying duct is equipped with deduster A.
Preferably, the upstream of main exhauster A is arranged in deduster A.
Preferably, deduster A is electric precipitator.
Preferably, the second smoke conveying duct is equipped with deduster B.
Preferably, the upstream of main exhauster B is arranged in deduster B.
Preferably, deduster B is electric precipitator.
Preferably, being equipped with ammonia injection apparatus A in the flue gas recirculation fan housing of sintering machine A or in flue gas mixer A.
Preferably, being equipped with ammonia injection apparatus B in the flue gas recirculation fan housing of sintering machine B or in flue gas mixer B.
The method for using flue gas recirculation in process of production is that the part of smoke for generating sintering process returns to sintering machine Cycle sintering is carried out in the flue gas recirculation fan housing on top.Sintering flue gas is recycled to sinter bed, and sensible heat and latent heat can be effective It utilizes, dust therein can be by partial adsorbates in the bed of material, NOXCompound can be pyrolyzed by Partial digestion, dioxin, SO2Through inhaling It receives, discharge process again and be enriched in flue gas, be convenient for subsequent processing.
In this application, for bi serie sintering system, flue gas will be partially sintered using active carbon desulfurization denitrating system It is recycled to: in the flue gas recirculation cover of active carbon desulfurization denitrating system and wet desulphurization denitrating system.To de- in active carbon desulfurization In nitre system, the concentration of unit volume sulfide is improved, the concentration of nitride is reduced, is conducive to dry desulfurization denitration；Exist simultaneously In wet desulphurization denitrating system, reduce the concentration of unit volume sulfide and nitride, reduce operating cost and waste material administer at This.Flue gas recirculation simultaneously has the function of recycling sintered discharge gas waste heat, emission reduction exhaust gas volumn, degradation some of the contaminants, in addition in work In property charcoal system for desulfuration and denitration, sulphur dioxide rich reduces the energy consumption of subsequent desulphurization system；The concentration of nitride is reduced, is reduced Denitrating catalyst investment；Reduce operating cost.
In this application, for double sintering systems, the flue gas desulfurization and denitrification for setting A sintering system is de- using active carbon desulfurization The flue gas desulfurization and denitrification of the processing of nitre system, B sintering system uses wet desulphurization denitration process；A sintering system and B sintering system packet Contain the introducing of independent air and sintering flue gas exhaust system.
Raw material is packed into the sintering machine of A sintering system above the ignition furnace B of ignition furnace A and the B sintering system of A sintering system In the sintering machine B of A and B sintering system, after lighting a fire at ignition furnace, under the drive of conveyer belt, A sintering system is respectively enterd The hot gas sintering furnace B of hot gas sintering furnace A and B sintering system.Into after hot gas sintering furnace, cigarette is provided with above hot gas sintering furnace Gas recycles fan housing.Air after preheating and gas is partially sintered in flue gas mixer A and the B sintering system of A sintering system It mixes, is passed through after mixing in flue gas recirculation fan housing under the action of flue gas mixer B.It is burnt in the main exhauster A and B of A sintering system Under the action of the main exhauster B of clone system, the bellows below sintering machine generate uniform negative pressure, the sky in flue gas recirculation fan housing Gas under the influence of air pressure, the raw materials for sintering on sintering machine, after being reacted with raw material, by bellows, into A sintering system The large flue B of large flue A and B sintering system.Into the sintering flue gas of large flue, respectively in A sintering system main exhauster A and B It is each by entering after the deduster B of deduster A and the B sintering system of A sintering system under the action of sintering system main exhauster B From system for desulfuration and denitration in；The sintering flue gas of A sintering system enters active carbon desulfurization denitrating system, the sintering of B sintering system Flue gas enters wet desulphurization denitrating system.After system for desulfuration and denitration processing, atmosphere is discharged by chimney.
In this application, in this application, the large flue A being connect with A sintering system main exhauster A, and it is located at main exhausting On first smoke conveying duct of A sintering system in the downstream machine A, two bronchials are separated, are respectively connected to A sintering system cigarette The first branch of gas mixer and the second branch for being connected to B sintering system flue gas mixer.Circulation is provided in the first branch Blower A1 is provided with circulating fan B1 in second branch.
Under the Action of Wind pressure of A sintering system main exhauster A, circulating fan A and circulating fan B, into active carbon desulfurization The ratio Q that the air quantity of denitrating system accounts for the total blast volume of A sintering system main exhauster A is 40-90 (vol) %；Preferably 45-85 (vol) %；More preferably 50-80 (vol) %.
The ratio Q1 for the total blast volume for accounting for A sintering system main exhauster A into the air circulation of the first branch is 5-40 (vol) %；Preferably 10-35 (vol) %；More preferably 15-30 (vol) %.
The ratio Q2 for the total blast volume for accounting for A sintering system main exhauster A into the air circulation of second branch is 5-40 (vol) %；Preferably 10-35 (vol) %；More preferably 15-30 (vol) %.
It should be further noted that be recycled to B sintering system since A sintering system separates a part of sintering flue gas, then A The amount of flue gas emission that sintering system inputs active carbon desulfurization denitrating system is reduced, so after pipeline, in unit volume, The temperature for being delivered to the sintering flue gas of active carbon desulfurization denitrating system is relatively low, and since circulating flue gas (passing through the first branch) returns Into the sintering machine A of A sintering system, SO is generated2Enrichment effect, sintering machine A discharge sintering flue gas in SO2Concentration it is high.
In addition, having received the cycle sintering flue gas of a part of A sintering system due to the sintering machine of B sintering system, it is sintered in B In the case that the sintering reaction and preheated gas energy of system are constant, B sintering system sintering machine B discharge sintering flue gas it is total Volume is big, and unit energy value is high.So the sintering flue gas of B sintering system discharge is by pipeline to wet desulphurization denitration system After system, temperature is relatively high, and since gas gross is big, gas dilution, SO2Concentration it is low.
In this application, on first smoke conveying duct of A sintering system in A sintering system main exhauster downstream, two are separated Bronchial is respectively connected to the first branch of A sintering system flue gas mixer and is connected to the mixing of B sintering system flue gas The second branch of device.This partially sinters flue gas and is mixed by flue gas mixer with the air after preheating.The oxygen of mixed gas Concentration is being controlled between 16%-21%, preferably 17%-20%, and more preferably 18%.
It should be noted that the combustion reaction in order to keep sintering system, the oxygen content being passed through in flue gas recirculation fan housing It cannot be below 16%；Atmospheric oxygen content is 21%.By adjusting the circulating flue gas and third flue gas delivery pipe of the first branch The ratio of the preheated air in road then can adjust the content that the oxygen of sintering reaction is participated in A sintering system.By adjusting second The ratio of the preheated air of the circulating flue gas on road and the 4th smoke conveying duct then can adjust in B sintering system and participate in sintering instead The content for the oxygen answered.By the oxygen content in the flue gas in control input flue gas recirculation fan housing, guarantee the normal of sintering machine Sintering.
In this application, flue gas mixer A is provided with ammonia injection apparatus A；Ammonia injection is provided in flue gas mixer B Device B.Circulating flue gas mixes in flue gas mixer with ammonia, and is sent into flue gas recirculation fan housing, the raw material in sintering machine Under the action of sintering reaction generates high temperature, the NO of sintering flue gas generationXSCR denitration reaction occurs with ammonia, to reduce sintering NO in the sintering flue gas of machine dischargeXConcentration.
In June, 2017, State Ministry of Environmental Protection issued the revision of " steel sintering, pelletizing industrial air pollution object discharge standard " Bulletin, by NOx(with NO2Meter) emission limit is from 300mg/Nm3It is adjusted downward to 100mg/Nm3, sintering and pellet roasting flue gas benchmark contain Oxygen amount is 16%.Discharge content due in new discharge standard, calculating nitrogen oxides is based on oxygen-containing in the discharge gas What amount was calculated, therefore, while controlling the content of nitrogen oxides in gas, the oxygen content in the gas is suitably reduced, passed through Conversion is crossed, the content of nitrogen oxides in the discharge gas is also reduced.
In the present invention, the flue gas being discharged by the middle sintering machine of A sintering system, the oxygen content in the flue gas be less than from The oxygen content in gas is discharged in ring cold machine low-temperature zone.By one in the flue gas being discharged by the middle sintering machine of A sintering system Divide and be delivered in the flue gas recirculation fan housing of sintering machine A in A sintering system, by gas mixing is discharged with from ring cold machine low-temperature zone Afterwards, it reduces into the oxygen content in sintering machine A gas, after the sintering process of sintering machine A, is discharged from sintering machine A air hose Flue gas in oxygen content further lower.Meanwhile the flue gas for being partly recycled to sintering machine A passes through the sintering of sintering machine A After the bed of material, dioxin decomposes in the sinter bed of high temperature；Ammonia is sprayed into mixed gas A, utilizes sintering feed in sintering machine A The hot environment of layer, NOxThe out of stock reaction of SCR and the out of stock reaction of SNCR occurs on sinter bed with ammonia, is followed to reduce Dioxin and NO in ring flue gasxContent.After circulating flue gas again passes by sintering machine A, SO2It is enriched with, is increased from large flue A discharges SO in flue gas2Concentration, be conducive to subsequent active carbon desulfurization denitration, improve SO2Recycling.Similarly, it is burnt by A The flue gas of the middle sintering machine discharge of clone system, the oxygen content in the flue gas are less than the oxygen from ring cold machine low-temperature zone discharge gas Gas content.A part in the flue gas being discharged by the middle sintering machine of A sintering system is delivered to sintering machine B in B sintering system Flue gas recirculation fan housing in, by with from ring cold machine low-temperature zone be discharged gas mixing after, reduce into sintering machine B gas Oxygen content further lowers after the sintering process of sintering machine B from the oxygen content in the flue gas that sintering machine B air hose discharges. Meanwhile this is partly recycled to the flue gas of sintering machine B after the sinter bed of sintering machine B, sinter bed of the dioxin in high temperature Middle decomposition；Ammonia is sprayed into mixed gas B, utilizes the hot environment of sinter bed in sintering machine B, NOxIt is being sintered with ammonia The out of stock reaction of SCR and the out of stock reaction of SNCR occur on the bed of material, to reduce dioxin and NO in circulating flue gasxContent.
A sintering system of the invention uses active carbon desulfurization denitration.Due to the flue gas that sintering machine A is discharged in A sintering system In a part be recycled in the flue gas recirculation fan housing of sintering machine A and sintering machine B, so being delivered to active carbon desulfurization denitrating system Exhaust gas volumn reduce.The exhaust gas volumn for being delivered to active carbon desulfurization denitrating system is reduced, after pipeline, due to dissipating for heat It loses, smoke temperature drop is big, causes the temperature for being delivered to the flue gas of active carbon desulfurization denitrating system relatively low.Meanwhile the part cigarette A part in gas is recycled to sintering machine A, the SO after circulating flue gas again passes by sintering machine A, in circulating flue gas2It is enriched with, So that into the SO in the flue gas of active carbon desulfurization denitrating system2Concentration increases.The characteristics of due to active carbon desulfurization denitrating technique, At high cost, denitrification efficiency is high, and desulfurization temperature requires relatively low, SO2Recovery utilization rate height etc. is conveyed from A sintering system Flue gas to active carbon desulfurization denitrating system just agrees with These characteristics, handles the part cigarette using active carbon desulfurization denitrating system Gas reduces since amount of flue gas emission is opposite, saves cost；Temperature is relatively low, is suitble to active carbon desulfurization denitration；SO in flue gas2It is dense Degree is high, using active carbon desulfurization denitration, improves SO2The rate of recovery, reduce environmental pollution, by-product can produce additional warp Ji value.
B sintering system of the invention uses wet desulphurization denitration.Due in A sintering system sintering machine A discharge flue gas in A part be recycled in the flue gas recirculation fan housing of sintering machine B, so be delivered to wet desulphurization denitrating system exhaust gas volumn increase. The exhaust gas volumn for being delivered to wet desulphurization denitrating system increases, and after pipeline, due to scattering and disappearing for heat, smoke temperature drop is small, Cause the temperature for being delivered to the flue gas of active carbon desulfurization denitrating system relatively high.Meanwhile a part in the partial fume is followed Ring is to sintering machine B, and after circulating flue gas again passes by sintering machine B, the flue gas of sintering machine B discharge is not recycled, so that into SO in the flue gas of wet desulphurization denitrating system2Concentration is relatively low.The characteristics of due to wet desulphurization denitrating technique, cost is opposite Lower, the out of stock effect of the higher desulfurization of temperature is better, SO2Recovery utilization rate height etc. is delivered to wet desulphurization denitration from B sintering system The flue gas of system just agrees with These characteristics, the partial fume is handled using wet desulphurization denitrating system, due to amount of flue gas emission phase To larger, using wet desulphurization denitration, cost is saved；Temperature is relatively high, is suitble to wet desulphurization denitration；SO in flue gas2Concentration Relatively low (the SO in opposite entering charcoal desulphurization denitration flue gas2Concentration), using wet desulphurization denitration, effectively recycle SO2, It reduces environmental pollution.
Reducing agent is sprayed into flue gas recirculation fan housing or in flue gas mixer, at this point, reducing agent is mixed with circulating flue gas Afterwards, using sintered ore materials on sintering machine as reaction bedding, reducing agent and the nitrogen oxides (NO in flue gasx) SNCR denitration occurs Reaction and SCR denitration reaction generate nitrogen, to dispose the NO in flue gasx.In the prior art, the cigarette discharged from sintering machine Gas direct emission after desulfurization process and dust removal process, the present invention change this technology, this partial fume is sent to sintering machine Flue gas recirculation fan housing in, while reducing agent is sprayed into flue gas recirculation fan housing or in flue gas mixer, using in sintering machine Hot environment, realize SNCR denitration and SCR denitration, reduce the content of nitrogen oxides in effluent.The technique constantly recycles, finally From the flue gas of the sintering machine discharged in chimney, the content of nitrogen oxides be can control in 100mg/Nm3Below.
In the present invention, the technique is by by the high flue gas of oxygen content (in the prior art by the partial fume direct emission) In a part be recycled to sintering machine, by ignition sintering, to consume the oxygen in the part circulating flue gas, reduce discharge Oxygen content in gas, to further reduce the content of nitrogen oxides in discharge gas.
In this application, gas circulation is partially sintered, participates in sintering again, dust therein can be by partial adsorbates in the bed of material In, NOXCompound can be pyrolyzed by Partial digestion, dioxin, SO2It absorbed, discharge process again and be enriched in flue gas；It is sintered in A In system, the amount of flue gas emission that A sintering system sintering machine enters system for desulfuration and denitration is reduced, and flue-gas temperature is relatively relatively low, unit The concentration of sulfide can increase in volume, and overall nitride is reduced, and dust is reduced, and dioxin concentration reduces, and be conducive to improve A burning Active carbon desulfurization denitrating system improves the production efficiency of A sintering system to the removal efficiency of sulfide in clone system, reduces production Cost.In B sintering system, the amount of flue gas emission that B sintering system sintering machine enters system for desulfuration and denitration increases, and flue-gas temperature is opposite Higher, the concentration of sulfide reduces in unit volume, and overall nitride is reduced, and dust is reduced, and dioxin concentration reduces, and is conducive to The use for reducing B sintering system catalyst reduces the generation of pollutant, reduces pollutant control expense, reduces production cost.
In this application, two branch tracheaes are separated in the downstream A sintering system main exhauster A, improvement cost is low, Neng Goujin The production efficiency and reduction production cost of the double sintering systems of the raising of one step.
In this application, the circulation of high temperature sintering flue gas can further promote the combustion reaction of raw material, reduce igniting When and consumption when hot gas sintering, to fuel
In this application, the ring that sintered raw material respectively enters ring cold machine A and the B sintering system of A sintering system is completed In cold B.Ring cold machine is circular ring shape, and ring cold machine is divided into 3 sections, and the part that raw material after sintering flows through at the first time is defined as height Temperature section, the part that raw material flows through after being sintered after high temperature section are defined as middle-temperature section, the portion that raw material after sintering is finally flowed through Divide and is defined as low-temperature zone.Each temperature section can be passed through the air blasted by air blower, and the air of air and each temperature section fills Divide heat exchange and then by independent exhaust fan, air after the preheating of each temperature section is extracted out.Ring cold machine high temperature section is cooling to be generated Hot gas for carrying out cogeneration.The cooling hot gas generated of middle-temperature section in conjunction with ignition furnace for carrying out a baked wheaten cake on sintering machine Knot, provides oxygen to light raw material.The cooling low temperature hot gas generated of low-temperature zone is used to mix with the sintering flue gas of flue gas mixer, Oxygen concentration is adjusted, to maintain material combusting to provide oxygen.
In the present invention, the trolley total length (that is, the effective exhausting length of sintering machine) of sintering machine A is 60-160 meters, preferably It is 70-150 meters, it is 80-140 meters more preferable.The total length of sintering pallet refers to the sum of the length of all trolleys on sintering machine. The bellows number of sintering machine A is 20-40, preferably 22-36, more preferably 24-32.The cigarette being arranged above sintering machine A The bellows number that gas circulation fan housing covers is 12-24, preferably 14-22, more preferably 16-20.
The trolley total length (that is, the effective exhausting length of sintering machine) of sintering machine B be 60-160 meters, preferably 70-150 meters, More preferably 80-140 meters.The total length of sintering pallet refers to the sum of the length of all trolleys on sintering machine.The bellows of sintering machine B Number is 20-40, preferably 22-36, more preferably 24-32.The flue gas recirculation fan housing being arranged above sintering machine B covers Bellows number be 12-24, preferably 14-22, more preferably 16-20.
Compared with prior art, the invention has the following advantages:
1, further energy-saving and emission-reduction may be implemented in the present invention, carry out the transformation that forms a complete set of to subsequent fume treatment auxiliary, Effectively high cost active carbon desulfurization denitrification apparatus and inexpensive conventional wet lay desulfuring and denitrifying apparatus are organically combined, reached most The effect of good desulphurization denitration, reduces overall cost of ownership, and running cost during reduction is convenient for existing bi serie sintering system Transformation.
2, flue gas recirculation technique of the present invention has the high advantage of flue gas recirculation rate, participates in burning in flue gas recirculation to sintering machine Knot, high-temperature flue gas can further acceleration of sintering react, and can save some fuel；Flue gas recirculation is arranged on sintering machine to seal Cover avoids exhaust gas and leaks, be conducive to environmental protection so that sintering machine surrounding air environment improves；
3, the present invention can reduce smoke discharge amount, after partially sintering gas participation circulation, the flue gas row of two sintering systems It will high-volume reduce accordingly, and improve the follow-up sintering gas treatment ability of two systems, reduce smoke discharge amount, not only have Conducive to environmental requirement, and cost and resource are saved, as energy-saving and emission-reduction；
4, flue gas recirculation technique of the present invention can recycle sintered discharge gas waste heat, emission reduction exhaust gas volumn, degradation some of the contaminants, together When sulphur dioxide rich, reduce the energy consumption of subsequent desulphurization system, reduce operating cost.
Detailed description of the invention
Fig. 1 is bi serie sintering system primary structure schematic diagram of the present invention；
Fig. 2 is A series sinter system structure diagram of the present invention；
Fig. 3 is B series sinter system structure diagram of the present invention.
Appended drawing reference:
1:A sintering system；101: sintering machine A；10101: wind box branch pipe A；10102: large flue A；102: ring cold machine A； 103: main exhauster A；104: active carbon desulfurization denitrating system；105: circulating fan A1；106: flue gas mixer A；107: circulation Blower A2；108: deduster A；109: ammonia injection apparatus A；2:B sintering system；201: sintering machine B；20101: wind box branch pipe B； 20102: large flue B；202: ring cold machine B；203: main exhauster B；204: wet desulphurization denitrating system；205: circulating fan B1； 206: flue gas mixer B；207: circulating fan B2；208: deduster B；209: ammonia injection apparatus B；
L1: the first smoke conveying duct；L1a: the first branch；L1b: second branch；L3: third smoke conveying duct；L4: 4th smoke conveying duct.
Specific embodiment
A kind of bi serie sintering system smoke comprehensive circulation process method, the sintering system include that A sintering system 1 and B are burnt Clone system 2, method includes the following steps:
1) sintering process: sintering feed is respectively charged on the sintering machine in A sintering system 1 and B sintering system 2, is then passed through The ignition furnace that sintering machine front is arranged in carries out ignition to the sintering feed on sintering machine, is re-introduced into the hot wind from ring cold machine Carry out combustion-supporting sintering；Air above sintering machine is by the main exhausting of main exhauster A103, B sintering system 2 of A sintering system 1 Machine B203 is pumped into each independently in the sintering feed on sintering machine；The flue gas that sintering machine generates in A sintering system 1 enters A sintering The flue gas that sintering machine generates in large flue A10102, B sintering system 2 in system 1 enters the large flue in B sintering system 2 B20102；
2) cooling procedure: entering ring cold machine and cooled down by the mineral aggregate that sintering machine completes sintering process, cooling gas with It is cooled down by the sintered mineral aggregate of sintering machine by heat exchange；
3) fume treatment: the flue gas in large flue A10102 passes through the first flue gas delivery pipe after main exhauster A103 Road L1 is delivered to active carbon desulfurization denitrating system 104 and carries out desulphurization denitration processing；Flue gas in large flue B20102 passes through main pumping After blower B203, wet desulphurization denitrating system 204 is delivered to by the second smoke conveying duct L2 and carries out desulphurization denitration processing；
Wherein: for the flue gas in large flue A10102 after main exhauster A103, the first smoke conveying duct L1 separates two A branch, wherein first branch L1a is connected in the flue gas recirculation fan housing of sintering machine A101 in A sintering system 1, second branch L1b is connected in the flue gas recirculation fan housing of sintering machine B201 in B sintering system 2；Flue gas in large flue A10102 is transported to:
1. active carbon desulfurization denitrating system 104 carries out desulphurization denitration processing,
2. in A sintering system 1 in the flue gas recirculation fan housing of sintering machine, for the sintering of sintering machine in A sintering system 1,
3. the sintering in B sintering system 2 in the flue gas recirculation fan housing of sintering machine, for sintering machine in B sintering system 2.
Preferably, 40-90 (vol) % in flue gas in large flue A10102 is transported to active carbon desulfurization denitration system System 104；Preferably 45-85 (vol) % is transported to active carbon desulfurization denitrating system 104；More preferably 50-80 (vol) % quilt It is delivered to active carbon desulfurization denitrating system 104.
Preferably, 5-40 (vol) % in flue gas in large flue A10102 is transported in A sintering system 1 and is sintered In the flue gas recirculation fan housing of machine A；Preferably 10-35 (vol) % is transported to the flue gas recirculation wind of sintering machine A in A sintering system 1 In cover；More preferably 15-30 (vol) % is transported in the flue gas recirculation fan housing of sintering machine A in A sintering system 1.
Preferably, 5-40 (vol) % in flue gas in large flue A10102 is transported in B sintering system 2 and is sintered In the flue gas recirculation fan housing of machine B；Preferably 10-35 (vol) % is transported to the flue gas recirculation wind of sintering machine B in B sintering system 2 In cover；More preferably 15-30 (vol) % is transported in the flue gas recirculation fan housing of sintering machine B in B sintering system 2.
Preferably, the gas of ring cold machine low-temperature zone discharge passes through in the flue gas of first branch L1a conveying, A sintering system 1 It is transported in the flue gas recirculation fan housing of sintering machine A in A sintering system 1 after flue gas mixer A106 mixing.
Preferably, the gas of ring cold machine low-temperature zone discharge passes through in the flue gas of second branch L1b conveying, B sintering system 2 It is transported in the flue gas recirculation fan housing of sintering machine B in B sintering system 2 after flue gas mixer B206 mixing.
Preferably, the flue gas in large flue A10102 is passed through after deduster A108 dedusting by main exhauster A103 It crosses the first smoke conveying duct L1 and is delivered to the progress desulphurization denitration processing of active carbon desulfurization denitrating system 104.
Preferably, the deduster A108 is electric precipitator.
Preferably, after smoke duster B208 dedusting in large flue B20102, by after main exhauster B203 by Second smoke conveying duct L2 is delivered to wet desulphurization denitrating system 204 and carries out desulphurization denitration processing；Preferably, the dedusting Device B208 is electric precipitator.
Preferably, the gas of ring cold machine low-temperature zone discharge passes through in the flue gas of first branch L1a conveying, A sintering system 1 After flue gas mixer A106 mixing, mixed gas A is obtained；Oxygen content in mixed gas A is more than or equal to 17% (vol), preferably To be more preferably higher than equal to 18% (vol) more than or equal to 17.5% (vol).
Preferably, the gas of ring cold machine low-temperature zone discharge passes through in the flue gas of second branch L1b conveying, B sintering system 2 After flue gas mixer B206 mixing, mixed gas B is obtained；Oxygen content in mixed gas B is more than or equal to 17% (vol), preferably To be more preferably higher than equal to 18% (vol) more than or equal to 17.5% (vol).
Preferably, being equipped with ammonia injection apparatus A109 in flue gas mixer A106, ammonia injection apparatus A109 sprays ammonia Gas is mixed into mixed gas A, and mixed gas A is transported in the flue gas recirculation fan housing of sintering machine in A sintering system 1, mixing NO in gas AxSCR denitration reaction occurs in the flue gas recirculation fan housing of sintering machine with ammonia.
Preferably, being equipped with ammonia injection apparatus B209 in flue gas mixer B206, ammonia injection apparatus B209 sprays ammonia Gas is mixed into mixed gas B, and mixed gas B is transported in the flue gas recirculation fan housing of sintering machine in B sintering system 2, mixing NO in gas BxSCR denitration reaction occurs in the flue gas recirculation fan housing of sintering machine with ammonia.
A kind of bi serie sintering system smoke comprehensive cyclic processing device is used for bi serie sintering system smoke comprehensive The device of circulation process method, the device include A sintering system 1 and B sintering system 2；Wherein A sintering system 1 includes sintering machine A101, ring cold machine A102, main exhauster A103, active carbon desulfurization denitrating system 104；B sintering system 2 include sintering machine B201, Ring cold machine B202, main exhauster B203, wet desulphurization denitrating system 204；
The bellows of sintering machine A101 are connected to large flue A10102 by wind box branch pipe A10101, and large flue A10102 passes through First smoke conveying duct L1 is connected to active carbon desulfurization denitrating system 104, and the low-temperature zone gas vent of ring cold machine A102 passes through Third smoke conveying duct L3 is connected in the flue gas recirculation fan housing of sintering machine A101；First smoke conveying duct L1 is equipped with master Exhaust fan A103；
The bellows of sintering machine B201 are connected to large flue B20102 by wind box branch pipe B20101, and large flue B20102 passes through Second smoke conveying duct L2 is connected to wet desulphurization denitrating system 204, and the low-temperature zone gas vent of ring cold machine B202 passes through the Four smoke conveying duct L4 are connected in the flue gas recirculation fan housing of sintering machine B201；Second smoke conveying duct L2 is equipped with main pumping Blower B203；
Wherein: the first smoke conveying duct L1 separates two branches, and wherein first branch L1a is connected to sintering machine A101's In flue gas recirculation fan housing, second branch L1b is connected in the flue gas recirculation fan housing of sintering machine B201；First branch L1a is equipped with Circulating fan A1105, second branch L1b are equipped with circulating fan B1205.
Preferably, the device further includes flue gas mixer A106, the end of first branch L1a is connected to flue gas mixer A106, the end of third smoke conveying duct L3 are connected to flue gas mixer A106, and the gas vent of flue gas mixer A106 connects It is connected in the flue gas recirculation fan housing of sintering machine A101.
Preferably, third smoke conveying duct L3 is equipped with circulating fan A2107.
Preferably, the device further includes flue gas mixer B206, the end of second branch L1b is connected to flue gas mixer B206, the end of the 4th smoke conveying duct L4 are connected to flue gas mixer B206, and the gas vent of flue gas mixer B206 connects It is connected in the flue gas recirculation fan housing of sintering machine B201.
Preferably, the 4th smoke conveying duct L4 is equipped with circulating fan B2107.
Preferably, the first smoke conveying duct L1 is equipped with deduster A108.
Preferably, the upstream of main exhauster A103 is arranged in deduster A108.
Preferably, deduster A108 is electric precipitator.
Second smoke conveying duct L2 is equipped with deduster B208.
Preferably, the upstream of main exhauster B203 is arranged in deduster B208.
Preferably, deduster B208 is electric precipitator.
Preferably, being equipped with ammonia injection dress in the flue gas recirculation fan housing of sintering machine A101 or in flue gas mixer A106 Set A109.
Preferably, being equipped with ammonia injection dress in the flue gas recirculation fan housing of sintering machine B201 or in flue gas mixer B206 Set B209.
Embodiment 1
A kind of bi serie sintering system smoke comprehensive circulation process method, the sintering system include that A sintering system 1 and B are burnt Clone system 2, method includes the following steps:
1) sintering process: sintering feed is respectively charged on the sintering machine in A sintering system 1 and B sintering system 2, is then passed through The ignition furnace that sintering machine front is arranged in carries out ignition to the sintering feed on sintering machine, is re-introduced into the hot wind from ring cold machine Carry out combustion-supporting sintering；Air above sintering machine is by the main exhausting of main exhauster A103, B sintering system 2 of A sintering system 1 Machine B203 is pumped into each independently in the sintering feed on sintering machine；The flue gas that sintering machine generates in A sintering system 1 enters A sintering The flue gas that sintering machine generates in large flue A10102, B sintering system 2 in system 1 enters the large flue B in B sintering system 2 20102；
2) cooling procedure: entering ring cold machine and cooled down by the mineral aggregate that sintering machine completes sintering process, cooling gas with It is cooled down by the sintered mineral aggregate of sintering machine by heat exchange；
3) fume treatment: the flue gas in large flue A10102 passes through the first flue gas delivery pipe after main exhauster A103 Road L1 is delivered to active carbon desulfurization denitrating system 104 and carries out desulphurization denitration processing；Flue gas in large flue B 20102 passes through main pumping After blower B203, wet desulphurization denitrating system 204 is delivered to by the second smoke conveying duct L2 and carries out desulphurization denitration processing；
Wherein: for the flue gas in large flue A10102 after main exhauster A103, the first smoke conveying duct L1 separates two A branch, wherein first branch L1a is connected in the flue gas recirculation fan housing of sintering machine A 101 in A sintering system 1, second branch L1b is connected in the flue gas recirculation fan housing of sintering machine B 201 in B sintering system 2；Flue gas in large flue A10102 is conveyed Extremely:
1. active carbon desulfurization denitrating system 104 carries out desulphurization denitration processing,
2. in A sintering system 1 in the flue gas recirculation fan housing of sintering machine, for the sintering of sintering machine in A sintering system 1,
3. the sintering in B sintering system 2 in the flue gas recirculation fan housing of sintering machine, for sintering machine in B sintering system 2.
Embodiment 2
Embodiment 1 is repeated, only it is de- to be transported to active carbon desulfurization by 60 (vol) % in the flue gas in large flue A10102 Nitre system 104.20 (vol) % in flue gas in large flue A10102 are transported to the flue gas of sintering machine A in A sintering system 1 It recycles in fan housing.20 (vol) % in flue gas in large flue A10102 are transported to the flue gas of sintering machine B in B sintering system 2 It recycles in fan housing.
Embodiment 3
Embodiment 2 is repeated, only it is de- to be transported to active carbon desulfurization by 70 (vol) % in the flue gas in large flue A10102 Nitre system 104.15 (vol) % in flue gas in large flue A10102 are transported to the flue gas of sintering machine A in A sintering system 1 It recycles in fan housing.15 (vol) % in flue gas in large flue A10102 are transported to the flue gas of sintering machine B in B sintering system 2 It recycles in fan housing.
Embodiment 4
Embodiment 3 is repeated, only ring cold machine low-temperature zone discharge in the flue gas, A sintering system 1 of first branch L1a conveying Gas is transported in the flue gas recirculation fan housing of sintering machine A in A sintering system 1 after being mixed by flue gas mixer A 106.Second The flue gas of branch L1b conveying, after the gas of ring cold machine low-temperature zone discharge is mixed by flue gas mixer B 206 in B sintering system 2 It is transported in the flue gas recirculation fan housing of sintering machine B in B sintering system 2.
Embodiment 5
Embodiment 4 is repeated, only the flue gas in large flue A10102 passes through main exhausting after 108 dedusting of deduster A Machine A103 is delivered to active carbon desulfurization denitrating system 104 by the first smoke conveying duct L1 and carries out desulphurization denitration processing.It is described Deduster A 108 is electric precipitator.
Embodiment 6
It repeats embodiment 4 and passes through main exhauster only after 208 dedusting of smoke duster B in large flue B 20102 Wet desulphurization denitrating system 204, which is delivered to, by the second smoke conveying duct L2 after B203 carries out desulphurization denitration processing.It is described to remove Dirt device B208 is electric precipitator.
Embodiment 7
Embodiment 6 is repeated, only ring cold machine low-temperature zone discharge in the flue gas, A sintering system 1 of first branch L1a conveying After gas is mixed by flue gas mixer A 106, mixed gas A is obtained；Oxygen content in mixed gas A is 17% (vol).The The flue gas of two branch L1b conveying, the gas of ring cold machine low-temperature zone discharge passes through the mixing of flue gas mixer B 206 in B sintering system 2 Afterwards, mixed gas B is obtained；Oxygen content in mixed gas B is more than or equal to 17% (vol).
Embodiment 8
Embodiment 7 is repeated, only ring cold machine low-temperature zone discharge in the flue gas, A sintering system 1 of first branch L1a conveying After gas is mixed by flue gas mixer A 106, mixed gas A is obtained；Oxygen content in mixed gas A is 18% (vol).The The flue gas of two branch L1b conveying, the gas of ring cold machine low-temperature zone discharge passes through the mixing of flue gas mixer B 206 in B sintering system 2 Afterwards, mixed gas B is obtained；Oxygen content in mixed gas B is more than or equal to 18% (vol).
Embodiment 9
Embodiment 7 is repeated, ammonia injection apparatus A 109, ammonia injection apparatus A are only equipped in flue gas mixer A 106 109 injection ammonias, are mixed into mixed gas A, mixed gas A is transported to the flue gas recirculation wind of sintering machine in A sintering system 1 NO in cover, in mixed gas AxSCR denitration reaction occurs in the flue gas recirculation fan housing of sintering machine with ammonia.Flue gas mixer Ammonia injection apparatus B 209 is equipped in B 206, ammonia injection apparatus B 209 sprays ammonia, is mixed into mixed gas B, mixes Gas B is transported in the flue gas recirculation fan housing of sintering machine in B sintering system 2, the NO in mixed gas BxIt is being sintered with ammonia SCR denitration reaction occurs in the flue gas recirculation fan housing of machine.
Embodiment 10
A kind of bi serie sintering system smoke comprehensive cyclic processing device is used for bi serie sintering system smoke comprehensive The device of circulation process method, the device include A sintering system 1 and B sintering system 2；Wherein A sintering system 1 includes sintering machine A 101, ring cold machine A 102, main exhauster A103, active carbon desulfurization denitrating system 104；B sintering system 2 include sintering machine B 201, Ring cold machine B 202, main exhauster B203, wet desulphurization denitrating system 204.
The bellows of sintering machine A 101 are connected to large flue A10102 by wind box branch pipe A 10101, and large flue A10102 is logical It crosses the first smoke conveying duct L1 and is connected to active carbon desulfurization denitrating system 104, the low-temperature zone gas vent of ring cold machine A 102 is logical Third smoke conveying duct L3 is crossed to be connected in the flue gas recirculation fan housing of sintering machine A 101；It is set on first smoke conveying duct L1 There is main exhauster A103.
The bellows of sintering machine B 201 are connected to large flue B 20102, large flue B 20102 by wind box branch pipe B 20101 It is connected to wet desulphurization denitrating system 204 by the second smoke conveying duct L2, the low-temperature zone gas vent of ring cold machine B 202 is logical The 4th smoke conveying duct L4 is crossed to be connected in the flue gas recirculation fan housing of sintering machine B 201；It is set on second smoke conveying duct L2 There is main exhauster B203.
Wherein: the first smoke conveying duct L1 separates two branches, and wherein first branch L1a is connected to sintering machine A 101 Flue gas recirculation fan housing in, second branch L1b is connected in the flue gas recirculation fan housing of sintering machine B 201；It is set on first branch L1a There are circulating fan A1 105, second branch L1b to be equipped with circulating fan B1205.
Embodiment 11
Embodiment 10 is repeated, only the device further includes flue gas mixer A 106, and the end of first branch L1a is connected to Flue gas mixer A 106, the end of third smoke conveying duct L3 are connected to flue gas mixer A 106, flue gas mixer A 106 Gas vent be connected in the flue gas recirculation fan housing of sintering machine A 101.Third smoke conveying duct L3 is equipped with circulating fan A2 107。
Embodiment 12
Embodiment 11 is repeated, only the device further includes flue gas mixer B206, and the end of second branch L1b is connected to cigarette Gas mixer B 206, the end of the 4th smoke conveying duct L4 are connected to flue gas mixer B 206, flue gas mixer B's 206 Gas vent is connected in the flue gas recirculation fan housing of sintering machine B 201.4th smoke conveying duct L4 is equipped with circulating fan B2 107。
Embodiment 13
Embodiment 12 is repeated, only the first smoke conveying duct L1 is equipped with deduster A 108.Deduster A 108 is arranged In the upstream of main exhauster A103.Deduster A 108 is electric precipitator.
Embodiment 14
Embodiment 13 is repeated, only the second smoke conveying duct L2 is equipped with deduster B 208.Deduster B 208 is arranged In the upstream of main exhauster B203.Deduster B 208 is electric precipitator.
Embodiment 15
Embodiment 14 is repeated, is only equipped in the flue gas recirculation fan housing of sintering machine A 101 or in flue gas mixer A 106 Ammonia injection apparatus A 109.
Embodiment 16
Embodiment 15 is repeated, is only equipped in the flue gas recirculation fan housing of sintering machine B 201 or in flue gas mixer B 206 Ammonia injection apparatus B 209.
Bi serie sintering system, if not using flue gas recirculation method of the present invention, respective normal discharge flue gas, Mei Gedan It is 30000m that series sinter, which discharges exhaust gas volumn,3/ min, sinter per ton need to consume 50-55kg fuel.Using the embodiment of the present invention After 16 scheme, since flue gas is recycled, discharge amount is reduced, can emission reduction 17-20%, while can use inorganization outlet Ring cold machine low-temperature zone exhaust gas, improve ring cold machine periphery working environment, for emission reduction, improve environment it is significant.Using cigarette After gas circulation technology, for using gas sensible heat instead of fraction solids fuel, saving fuel is that sinter per ton saves coal 1.13- 1.5kg, therefore the CO generated in original production2Amount can be also effectively reduced, and sinter per ton can reduce CO2Discharge amount 1.5- 2.0kg.Using flue gas recirculation technique, it is possible to reduce surface layer sinter chilling phenomenon, the rotary drum that can effectively improve sinter are strong Degree and yield rate are advantageous to the yield for improving two sintering machines.And after increasing smoke circulating system, reduce the negative of main exhauster Lotus effectively configures different system for desulfuration and denitration, achievees the purpose that save the cost.

Claims (10)

1. a kind of bi serie sintering system smoke comprehensive circulation process method, which includes that A sintering system (1) and B are burnt Clone is united (2), method includes the following steps:
1) sintering process: sintering feed is respectively charged on the sintering machine in A sintering system (1) and B sintering system (2), is then passed through The ignition furnace that sintering machine front is arranged in carries out ignition to the sintering feed on sintering machine, is re-introduced into the hot wind from ring cold machine Carry out combustion-supporting sintering；Air above sintering machine is by the main exhauster A (103) of A sintering system (1), B sintering system (2) Main exhauster B (203) is pumped into each independently in the sintering feed on sintering machine；The flue gas that sintering machine generates in A sintering system (1) Into the large flue A (10102) in A sintering system (1), the flue gas that sintering machine generates in B sintering system (2) enters B sintering system Large flue B (20102) in system (2)；
2) cooling procedure: entering ring cold machine by the mineral aggregate that sintering machine completes sintering process and cooled down, cooling gas and process The sintered mineral aggregate of sintering machine is cooled down by heat exchange；
3) fume treatment: the flue gas in large flue A (10102) passes through the first flue gas delivery pipe after main exhauster A (103) Road (L1) is delivered to active carbon desulfurization denitrating system (104) and carries out desulphurization denitration processing；Flue gas warp in large flue B (20102) After crossing main exhauster B (203), wet desulphurization denitrating system (204) is delivered to by the second smoke conveying duct (L2) and is taken off Sulphur denitration process；
It is characterized by: the flue gas in large flue A (10102) is after main exhauster A (103), the first smoke conveying duct (L1) two branches are separated, wherein the first branch (L1a) is connected in A sintering system (1) in the flue gas recirculation fan housing of sintering machine, Second branch (L1b) is connected in B sintering system (2) in the flue gas recirculation fan housing of sintering machine；Cigarette in large flue A (10102) Gas is transported to:
1. active carbon desulfurization denitrating system (104) carries out desulphurization denitration processing,
2. in A sintering system (1) in the flue gas recirculation fan housing of sintering machine, it is used for the sintering of sintering machine in A sintering system (1),
3. the sintering in B sintering system (2) in the flue gas recirculation fan housing of sintering machine, for sintering machine in B sintering system (2).
2. bi serie sintering system smoke comprehensive circulation process method according to claim 1, it is characterised in that: large flue 40-90 (vol) % in flue gas in A (10102) is transported to active carbon desulfurization denitrating system (104)；Preferably 45-85 (vol) % is transported to active carbon desulfurization denitrating system (104)；More preferably 50-80 (vol) % is transported to active carbon desulfurization Denitrating system (104)；And/or
The flue gas that 5-40 (vol) % in flue gas in large flue A (10102) is transported to sintering machine in A sintering system (1) follows In ring fan housing；Preferably 10-35 (vol) % is transported in A sintering system (1) in the flue gas recirculation fan housing of sintering machine；It is more excellent 15-30 (vol) % is selected as to be transported in A sintering system (1) in the flue gas recirculation fan housing of sintering machine；And/or
The flue gas that 5-40 (vol) % in flue gas in large flue A (10102) is transported to sintering machine in B sintering system (2) follows In ring fan housing；Preferably 10-35 (vol) % is transported in B sintering system (2) in the flue gas recirculation fan housing of sintering machine；It is more excellent 15-30 (vol) % is selected as to be transported in B sintering system (2) in the flue gas recirculation fan housing of sintering machine.
3. bi serie sintering system smoke comprehensive circulation process method according to claim 1 or 2, it is characterised in that: the The flue gas of one branch (L1a) conveying, the gas of ring cold machine low-temperature zone discharge passes through flue gas mixer A in A sintering system (1) (106) it is transported in A sintering system (1) in the flue gas recirculation fan housing of sintering machine after mixing；And/or
The flue gas of second branch (L1b) conveying, the gas of ring cold machine low-temperature zone discharge passes through flue gas mixing in B sintering system (2) It is transported in B sintering system (2) in the flue gas recirculation fan housing of sintering machine after device B (206) mixing.
4. bi serie sintering system smoke comprehensive circulation process method according to any one of claim 1-3, feature Be: the flue gas in large flue A (10102) passes through first after deduster A (108) dedusting, through main exhauster A (103) Smoke conveying duct (L1) is delivered to active carbon desulfurization denitrating system (104) and carries out desulphurization denitration processing；Preferably, described remove Dirt device A (108) is electric precipitator；And/or
After smoke duster B (208) dedusting in large flue B (20102), by after main exhauster B (203) by the second flue gas Conveyance conduit (L2) is delivered to wet desulphurization denitrating system (204) and carries out desulphurization denitration processing；Preferably, the deduster B It (208) is electric precipitator.
5. bi serie sintering system smoke comprehensive circulation process method according to claim 3 or 4, it is characterised in that: the The flue gas of one branch (L1a) conveying, the gas of ring cold machine low-temperature zone discharge passes through flue gas mixer A in A sintering system (1) (106) after mixing, mixed gas A is obtained；Oxygen content in mixed gas A is more than or equal to 17% (vol), is preferably greater than equal to 17.5% (vol) is more preferably higher than equal to 18% (vol)；And/or
The flue gas of second branch (L1b) conveying, the gas of ring cold machine low-temperature zone discharge passes through flue gas mixing in B sintering system (2) After device B (206) mixing, mixed gas B is obtained；Oxygen content in mixed gas B is more than or equal to 17% (vol), preferably greater than Equal to 17.5% (vol), more preferably higher than it is equal to 18% (vol).
6. bi serie sintering system smoke comprehensive circulation process method according to claim 5, it is characterised in that: flue gas is mixed Ammonia injection apparatus A (109) is equipped in clutch A (106), ammonia injection apparatus A (109) sprays ammonia, is mixed into gaseous mixture Body A, mixed gas A are transported to the NO in A sintering system (1) in the flue gas recirculation fan housing of sintering machine, in mixed gas AxWith In the flue gas recirculation fan housing of sintering machine SCR denitration reaction occurs for ammonia；And/or
Ammonia injection apparatus B (209) is equipped in flue gas mixer B (206), ammonia injection apparatus B (209) sprays ammonia, mixing Into mixed gas B, mixed gas B is transported in B sintering system (2) in the flue gas recirculation fan housing of sintering machine, mixed gas B In NOxSCR denitration reaction occurs in the flue gas recirculation fan housing of sintering machine with ammonia.
7. a kind of bi serie sintering system smoke comprehensive cyclic processing device or for described in any one of claim 1-6 The device of reason method, the device include A sintering system (1) and B sintering system (2)；Wherein A sintering system (1) includes sintering machine A (101), ring cold machine A (102), main exhauster A (103), active carbon desulfurization denitrating system (104)；B sintering system (2) includes burning Knot machine B (201), ring cold machine B (202), main exhauster B (203), wet desulphurization denitrating system (204)；
The bellows of sintering machine A (101) are connected to large flue A (10102) by wind box branch pipe A (10101), large flue A (10102) It is connected to active carbon desulfurization denitrating system (104) by the first smoke conveying duct (L1), the low-temperature zone gas of ring cold machine A (102) Body outlet is connected in the flue gas recirculation fan housing of sintering machine A (101) by third smoke conveying duct (L3)；The conveying of first flue gas Pipeline (L1) is equipped with main exhauster A (103)；
The bellows of sintering machine B (201) are connected to large flue B (20102) by wind box branch pipe B (20101), large flue B (20102) It is connected to wet desulphurization denitrating system (204) by the second smoke conveying duct (L2), the low-temperature zone gas of ring cold machine B (202) Outlet is connected in the flue gas recirculation fan housing of sintering machine B (201) by the 4th smoke conveying duct (L4)；Second flue gas delivery pipe Road (L2) is equipped with main exhauster B (203)；
Wherein: the first smoke conveying duct (L1) separates two branches, and wherein the first branch (L1a) is connected to sintering machine A (101) Flue gas recirculation fan housing in, second branch (L1b) is connected in the flue gas recirculation fan housing of sintering machine B (201)；The first branch (L1a) circulating fan A1 (105) are equipped with, second branch (L1b) is equipped with circulating fan B1 (205).
8. bi serie sintering system smoke comprehensive cyclic processing device according to claim 7, it is characterised in that: the device It further include flue gas mixer A (106), the end of the first branch (L1a) is connected to flue gas mixer A (106), the conveying of third flue gas The end of pipeline (L3) is connected to flue gas mixer A (106), and the gas vent of flue gas mixer A (106) is connected to sintering machine A (101) in flue gas recirculation fan housing；Preferably, third smoke conveying duct (L3) is equipped with circulating fan A2 (107)；With/ Or
The device further includes flue gas mixer B (206), and the end of second branch (L1b) is connected to flue gas mixer B (206), the The end of four smoke conveying ducts (L4) is connected to flue gas mixer B (206), the gas vent connection of flue gas mixer B (206) To the flue gas recirculation fan housing of sintering machine B (201)；Preferably, the 4th smoke conveying duct (L4) is equipped with circulating fan B2 (107)。
9. bi serie sintering system smoke comprehensive cyclic processing device according to claim 7 or 8, it is characterised in that: the One smoke conveying duct (L1) is equipped with deduster A (108)；Preferably, deduster A (108) is arranged in main exhauster A (103) upstream；Preferably, deduster A (108) is electric precipitator；And/or
Second smoke conveying duct (L2) is equipped with deduster B (208)；Preferably, deduster B (208) is arranged in main exhausting The upstream of machine B (203)；Preferably, deduster B (208) is electric precipitator.
10. bi serie sintering system smoke comprehensive cyclic processing device according to claim 8 or claim 9, it is characterised in that: burn Ammonia injection apparatus A (109) is equipped in the flue gas recirculation fan housing of knot machine A (101) or in flue gas mixer A (106)；And/or
Ammonia injection apparatus B (209) is equipped in the flue gas recirculation fan housing of sintering machine B (201) or in flue gas mixer B (206).
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