CN109569183B - Comprehensive circulation treatment method and treatment device for flue gas of double-series sintering system - Google Patents

Comprehensive circulation treatment method and treatment device for flue gas of double-series sintering system Download PDF

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CN109569183B
CN109569183B CN201910001940.5A CN201910001940A CN109569183B CN 109569183 B CN109569183 B CN 109569183B CN 201910001940 A CN201910001940 A CN 201910001940A CN 109569183 B CN109569183 B CN 109569183B
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flue gas
sintering
gas
flue
sintering machine
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CN109569183A (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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    • B01D53/34—Chemical or biological purification of waste gases
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    • 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
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    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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    • 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
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    • B01D2251/00—Reactants
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
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    • 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
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Abstract

A comprehensive circulation method for flue gas of a double-series sintering system comprises the following steps: 1) and (3) sintering: sintering the raw materials in a sintering machine to generate sintering gas; 2) and (3) cooling: cooling the sintered raw materials in a circular cooler; 3) flue gas treatment: after passing through a dust removal device, the sintering gas enters a desulfurization and denitrification system for treatment, wherein the sintering system A adopts an activated carbon desulfurization and denitrification system, and the system B adopts a wet desulfurization and denitrification system; and the sintering flue gas of the sintering system A is divided into two circulating branch gas pipelines which are respectively introduced into the sintering machine of the sintering system A and the sintering machine of the sintering system B. The invention aims to improve the concentration of sulfide and reduce the concentration of nitride in a dry desulfurization and denitrification system, thereby being beneficial to dry desulfurization and denitrification; meanwhile, in a wet desulfurization and denitrification system, the concentration of sulfide and nitride is reduced, and wet desulfurization and denitrification are facilitated; thereby reducing the energy consumption in industrial production and saving the production cost.

Description

Comprehensive circulation treatment method and treatment device for flue gas of double-series sintering system
Technical Field
The invention relates to a flue gas circulation method of a sintering system, in particular to a comprehensive flue gas circulation method of a double-series sintering system, and belongs to the technical field of sintering flue gas treatment.
Background
As steel sintering plants mainly produce sinter, the sinter is used for blast furnace iron making. In a steel sintering plant, the main flow is that raw materials such as iron ore concentrate, flux, fuel and the like are proportioned, then mixed and granulated, then the mixture enters a sintering machine for sintering, and after sintering, the mixture is crushed and screened to obtain sintered ore. During sintering, air is pumped into the materials of the sintering machine from the upper part of the sintering machine through a fan and is ignited with the fuel in the materials for sintering, flue gas generated by sintering is pumped away by the fan and flows to a desulfurization and denitrification system through an air box, a large flue and a dust remover below the sintering machine, and the flue gas is discharged after desulfurization and denitrification.
With the development of industrial and modern construction, the demand for the output of steel plants is getting larger and larger, the demand for iron-making blast furnaces is getting larger and larger, and the demand for sintering ores of corresponding blast furnaces is also getting larger and larger, and now two sintering machines are generally used for supplying one blast furnace for one blast furnace. The double-series sintering systems of the sintering plant are more and more, the double-series sintering systems are generally two sintering machines side by side, each sintering machine generally has a flue gas treatment system except for sharing the same raw material proportioning system, and the flue gas treatment systems are generally discharged after respective desulfurization and denitrification.
Different desulfurization and denitrification treatment methods, such as dry desulfurization and denitrification and wet desulfurization and denitrification, have obvious difference in removal efficiency for sulfur oxides and nitrogen oxides with different concentrations in sintering flue gas. In the actual production process, the higher the sulfide concentration in the flue gas in unit volume is, the higher the probability of collision adsorption of sulfide molecules and the activated carbon is, namely, the sulfides are more easily adsorbed by the activated carbon, so that the adsorption efficiency of the activated carbon and the removal efficiency of the sulfides in the adsorption tower are improved, and the production cost is saved; in the wet desulfurization and denitration process, the lower the concentration of sulfides in the flue gas is, the less the catalyst is required, the less water consumption is realized, the less pollutants are discharged, the pollutant treatment cost is low, and the production cost is saved.
In conclusion, the existing double-series sintering system adopts the independent sintering machine flue gas treatment system to treat sintering flue gas, so that the maximum removal efficiency cannot be reached, and the space is greatly improved.
The flue gas generated in the sintering process is a main pollutant in a sintering plant, and along with the increasing environmental protection requirement, the flue gas treatment is particularly important. Especially, in the existing double-series sintering system, because the output is large, the amount of generated flue gas is also large, and the number of harmful substances in the corresponding flue gas is increased, so that the environmental protection cost is higher and higher, the investment is also increased, and the energy consumption is also increased. Therefore, how to treat the flue gas of the dual-series sintering system with low cost becomes the focus of the current technical research.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present invention is directed to a dual-system sintering system, in which a portion of the sintering flue gas from an activated carbon desulfurization and denitrification system is circulated into the flue gas circulation hoods of the activated carbon desulfurization and denitrification system and the wet desulfurization and denitrification system. Therefore, in the activated carbon desulfurization and denitrification system, the concentration of sulfide is improved, the concentration of nitride is reduced, and dry desulfurization and denitrification are facilitated; meanwhile, in a wet desulfurization and denitrification system, the concentration of sulfide and nitride is reduced, and the operation cost and the waste treatment cost are reduced; thereby reducing the energy consumption in industrial production and saving the production cost. The invention provides a comprehensive circulation method for flue gas of a double-series sintering system, which comprises the following steps: 1) and (3) sintering: sintering raw materials in a sintering machine to generate sintering gas 2) cooling process: cooling the sintered raw materials in a circular cooler; 3) flue gas treatment: after passing through a dust removal device, the sintering gas enters a desulfurization and denitrification system for treatment, wherein the sintering system A adopts an activated carbon desulfurization and denitrification system, and the system B adopts a wet desulfurization and denitrification system; and the sintering flue gas of the sintering system A is divided into two circulating branch gas pipelines which are respectively introduced into the sintering machine of the sintering system A and the sintering machine of the sintering system B.
According to a first embodiment of the invention, a method for comprehensively circulating flue gas of a double-series sintering system is provided:
a comprehensive circulation treatment method for flue gas of a double-series sintering system comprises a sintering system A and a sintering system B, and comprises the following steps:
1) and (3) sintering: the sintering materials are respectively loaded on the sintering machines in the sintering system A and the sintering system B, then ignition combustion is carried out on the sintering materials on the sintering machines through an ignition furnace arranged at the front part of the sintering machines, and then hot air from the circular cooler is introduced for combustion-supporting sintering; air above the sinter is (at least partially) drawn into the sinter on the sinter by main blowers B of the sintering system of main blower A, B of the sintering system A independently (again); flue gas generated by the sintering machine in the sintering system A enters a large flue A in the sintering system A, and flue gas generated by the sintering machine in the sintering system B enters a large flue B in the sintering system B;
2) and (3) cooling: the mineral aggregate which is sintered by the sintering machine enters the circular cooler for cooling, and the cooling gas and the mineral aggregate sintered by the sintering machine are cooled through heat exchange;
3) flue gas treatment: after passing through a main exhaust fan A, the flue gas in the large flue A is conveyed to an active carbon desulfurization and denitrification system through a first flue gas conveying pipeline for desulfurization and denitrification treatment; after passing through the main exhaust fan B, the flue gas in the large flue B is conveyed to a wet desulfurization and denitrification system through a second flue gas conveying pipeline for desulfurization and denitrification treatment;
wherein: after the flue gas in the large flue A passes through the main exhaust fan A, the first flue gas conveying pipeline is divided into two branches, wherein the first branch is connected into a flue gas circulation fan cover of a sintering machine in the sintering system A, and the second branch is connected into a flue gas circulation fan cover of a sintering machine in the sintering system B; the flue gas in the large flue a is conveyed to:
firstly, the active carbon desulfurization and denitrification system carries out desulfurization and denitrification treatment,
secondly, the flue gas circulation fan cover of the sintering machine in the sintering system A is used for sintering the sintering machine in the sintering system A,
and thirdly, the flue gas circulation fan cover of the sintering machine in the sintering system B is used for sintering the sintering machine in the sintering system B.
Preferably, 40-90 (vol)% of the flue gas in the large flue A is conveyed to an activated carbon desulfurization and denitrification system; preferably 45-85 (vol)% is conveyed to the activated carbon desulfurization and denitrification system; more preferably 50-80 (vol)% is conveyed to the activated carbon desulfurization and denitrification system.
Preferably, 5-40 (vol)% of the flue gas in the large flue A is conveyed into a flue gas circulating fan cover of a sintering machine in the sintering system A; preferably 10-35 (vol)% is conveyed into a flue gas circulation fan cover of a sintering machine in the sintering system A; more preferably 15-30 (vol)% is conveyed into the flue gas circulation hood of the sintering machine in the sintering system A.
Preferably, 5-40 (vol)% of the flue gas in the large flue A is conveyed into a flue gas circulating fan cover of a sintering machine in the sintering system B; preferably 10-35 (vol)% is conveyed into a flue gas circulating fan cover of a sintering machine in the B sintering system; more preferably 15-30 (vol)% is conveyed to the flue gas circulation hood of the sintering machine in the B sintering system.
Preferably, the flue gas conveyed by the first branch and the gas discharged by the low-temperature section of the circular cooler in the sintering system A are mixed by the flue gas mixer A and then conveyed into a flue gas circulation fan cover of the sintering machine in the sintering system A.
Preferably, the flue gas conveyed by the second branch and the gas discharged from the low-temperature section of the circular cooler in the sintering system B are mixed by the flue gas mixer B and then conveyed into a flue gas circulation fan cover of the sintering machine in the sintering system B.
Preferably, after the flue gas in the large flue A is dedusted by the deduster A, the flue gas is conveyed to the activated carbon desulfurization and denitrification system by the main exhaust fan A through the first flue gas conveying pipeline for desulfurization and denitrification treatment.
Preferably, the dust remover A is an electric dust remover.
Preferably, after being dedusted by the flue gas deduster B in the large flue B, the flue gas deduster B passes through the main exhaust fan B and is conveyed to a wet desulfurization and denitrification system through a second flue gas conveying pipeline for desulfurization and denitrification treatment; preferably, the dust remover B is an electric dust remover.
Preferably, the flue gas conveyed by the first branch and the gas discharged by the low-temperature section of the circular cooler in the sintering system A are mixed by a flue gas mixer A to obtain a mixed gas A; the oxygen content in the mixed gas A is not less than 17% (vol), preferably not less than 17.5% (vol), more preferably not less than 18% (vol).
Preferably, the flue gas conveyed by the second branch and the gas discharged by the low-temperature section of the circular cooler in the sintering system B are mixed by a flue gas mixer B to obtain a mixed gas B; the oxygen content in the mixed gas B is not less than 17% (vol), preferably not less than 17.5% (vol), more preferably not less than 18% (vol).
Preferably, an ammonia gas injection device A is arranged in the flue gas mixer A, ammonia gas is injected by the ammonia gas injection device A and mixed into the mixed gas A, and the mixed gas A is conveyed to the sintering system A to be sinteredNO in mixed gas A in smoke circulating fan cover of knot tying machinexAnd carrying out SCR denitration reaction with ammonia gas in a flue gas circulation fan cover of the sintering machine.
Preferably, an ammonia gas injection device B is arranged in the flue gas mixer B, ammonia gas is injected by the ammonia gas injection device B and mixed into mixed gas B, the mixed gas B is conveyed into a flue gas circulation fan cover of a sintering machine in a sintering system B, and NO in the mixed gas BxAnd carrying out SCR denitration reaction with ammonia gas in a flue gas circulation fan cover of the sintering machine.
According to a second embodiment of the invention, a double-series sintering system flue gas comprehensive circulation device is provided.
A double-series sintering system flue gas comprehensive circulation treatment device or a device used in the circulation treatment method in the first embodiment comprises an A sintering system and a B sintering system; the sintering system A comprises a sintering machine A, an annular cooler A, a main exhaust fan A and an active carbon desulfurization and denitrification system; the sintering system B comprises a sintering machine B, a circular cooler B, a main exhaust fan B and a wet desulfurization and denitrification system.
An air box of the sintering machine A is connected to a large flue A through an air box branch pipe A, the large flue A is connected to an active carbon desulfurization and denitrification system through a first flue gas conveying pipeline, and a low-temperature section gas outlet of the annular cooler A is connected into a flue gas circulation fan cover of the sintering machine A through a third flue gas conveying pipeline; the first flue gas conveying pipeline is provided with a main exhaust fan A.
An air box of the sintering machine B is connected to a large flue B through an air box branch pipe B, the large flue B is connected to a wet desulfurization and denitrification system through a second flue gas conveying pipeline, and a gas outlet of a low-temperature section of the annular cooler B is connected into a flue gas circulation fan cover of the sintering machine B through a fourth flue gas conveying pipeline; and a main exhaust fan B is arranged on the second flue gas conveying pipeline.
Wherein: the first flue gas conveying pipeline is divided into two branches, wherein the first branch is connected into a flue gas circulation fan cover of the sintering machine A, and the second branch is connected into a flue gas circulation fan cover of the sintering machine B; a circulating fan A1 is arranged on the first branch, and a circulating fan B1 is arranged on the second branch.
Preferably, the device further comprises a flue gas mixer a, the end of the first branch is connected to the flue gas mixer a, the end of the third flue gas conveying pipeline is connected to the flue gas mixer a, and a gas outlet of the flue gas mixer a is connected to the inside of a flue gas circulation fan housing of the sintering machine a.
Preferably, the third flue gas conveying pipeline is provided with a circulating fan A2.
Preferably, the device further comprises a flue gas mixer B, the end of the second branch is connected to the flue gas mixer B, the end of the fourth flue gas conveying pipeline is connected to the flue gas mixer B, and a gas outlet of the flue gas mixer B is connected to the inside of a flue gas circulation fan housing of the sintering machine B.
Preferably, the fourth flue gas conveying pipeline is provided with a circulating fan B2.
Preferably, the first flue gas conveying pipeline is provided with a dust remover A.
Preferably, the dust separator a is arranged upstream of the main blower a.
Preferably, the dust remover A is an electric dust remover.
Preferably, the second flue gas conveying pipeline is provided with a dust remover B.
Preferably, the dust separator B is arranged upstream of the main blower B.
Preferably, the dust remover B is an electric dust remover.
Preferably, an ammonia gas injection device a is arranged in the flue gas circulation fan housing of the sintering machine a or in the flue gas mixer a.
Preferably, an ammonia gas injection device B is arranged in the flue gas circulation fan cover of the sintering machine B or in the flue gas mixer B.
In the production process, a flue gas circulation method is adopted, and a part of flue gas generated in the sintering process is returned to a flue gas circulation fan cover at the upper part of the sintering machine for circulating sintering. The sintering flue gas is circulated to the sintering material layer, the sensible heat and the latent heat of the sintering flue gas can be effectively utilized, the dust in the sintering flue gas can be partially adsorbed in the material layer, and NO isXThe compound is partially degraded, dioxin is pyrolyzed, and SO2The smoke is enriched in the smoke through the processes of absorption and re-release, and the subsequent treatment is convenient.
In this application, to two series of sintering systems, will adopt the partial sintering flue gas circulation of active carbon SOx/NOx control system to: the flue gas circulation cover of the active carbon desulfurization and denitrification system and the wet desulfurization and denitrification system. Therefore, in the activated carbon desulfurization and denitrification system, the concentration of sulfide in unit volume is improved, the concentration of nitride is reduced, and dry desulfurization and denitrification are facilitated; meanwhile, in a wet desulfurization and denitrification system, the concentration of sulfide and nitride in unit volume is reduced, and the operation cost and the waste treatment cost are reduced. Meanwhile, the flue gas circulation has the functions of recovering waste heat of sintering waste gas, reducing the emission of flue gas and degrading partial pollutants, and sulfur dioxide is enriched in an activated carbon desulfurization and denitrification system, so that the energy consumption of a subsequent desulfurization system is reduced; the concentration of nitride is reduced, and the input of a denitration catalyst is reduced; the operation cost is reduced.
In the application, aiming at a double sintering system, the flue gas desulfurization and denitrification of a sintering system A are treated by an activated carbon desulfurization and denitrification system, and the flue gas desulfurization and denitrification of a sintering system B are treated by a wet desulfurization and denitrification system; the sintering system A and the sintering system B comprise independent air introduction and sintering flue gas discharge systems.
The raw materials are loaded into a sintering machine A of the sintering system A and a sintering machine B of the sintering system B from the upper parts of an ignition furnace A of the sintering system A and an ignition furnace B of the sintering system B, and after ignition is carried out at the ignition furnaces, the raw materials respectively enter a hot air sintering furnace A of the sintering system A and a hot air sintering furnace B of the sintering system B under the driving of a conveying belt. After entering the hot air sintering furnace, a smoke circulating air cover is arranged above the hot air sintering furnace. The preheated air and part of sintering gas are mixed under the action of a flue gas mixer A of the sintering system A and a flue gas mixer B of the sintering system B, and the mixed air and part of sintering gas are introduced into a flue gas circulation fan cover. Under the action of a main exhaust fan A of the sintering system A and a main exhaust fan B of the sintering system B, an air box below the sintering machine generates uniform negative pressure, and air in the flue gas circulation air cover passes through sintering raw materials on the sintering machine under the action of air pressure, reacts with the raw materials, and then enters a large flue A of the sintering system A and a large flue B of the sintering system B through the air box. Sintering flue gas entering the large flue passes through a dust remover A of the sintering system A and a dust remover B of the sintering system B and then enters respective desulfurization and denitrification systems under the action of a main exhaust fan A of the sintering system A and a main exhaust fan B of the sintering system B respectively; and the sintering flue gas of the sintering system A enters an activated carbon desulfurization and denitrification system, and the sintering flue gas of the sintering system B enters a wet desulfurization and denitrification system. And after being treated by the desulfurization and denitrification system, the waste gas is discharged into the atmosphere through a chimney.
In the application, a large flue A connected with a main exhaust fan A of the sintering system A is arranged on a first flue gas conveying pipeline of the sintering system A at the downstream of the main exhaust fan A, and two branch gas pipelines are branched out, namely a first branch connected to a flue gas mixer of the sintering system A and a second branch connected to a flue gas mixer of the sintering system B. A circulating fan A1 is arranged on the first branch, and a circulating fan B1 is arranged on the second branch.
Under the wind pressure action of a main exhaust fan A, a circulating fan A and a circulating fan B of the sintering system A, the ratio Q of the wind volume entering the activated carbon desulfurization and denitrification system to the total wind volume of the main exhaust fan A of the sintering system A is 40-90 (vol)%; preferably 45-85 (vol)%; more preferably 50 to 80 (vol)%.
The ratio Q1 of the circulating air volume entering the first branch to the total air volume of the main exhaust fan A of the sintering system A is 5-40 (vol)%; preferably 10-35 (vol)%; more preferably 15 to 30 (vol)%.
The ratio Q2 of the circulating air volume entering the second branch to the total air volume of the main exhaust fan A of the sintering system A is 5-40 (vol)%; preferably 10-35 (vol)%; more preferably 15 to 30 (vol)%.
It should be further noted that, because a part of the sintering flue gas is separated from the sintering system a and recycled to the sintering system B, the total amount of flue gas input into the activated carbon desulfurization and denitrification system by the sintering system a is reduced, SO that the temperature of the sintering flue gas conveyed to the activated carbon desulfurization and denitrification system in unit volume after being conveyed by a pipeline is relatively low, and the recycled flue gas (through the first branch) returns to the sintering machine a of the sintering system a to generate SO2Enrichment effect, SO in sintering flue gas discharged from sintering machine A2Has a high concentration.
In addition, the sintering machine of the sintering system B receives part of the circulating sintering flue gas of the sintering system A, and the sintering system B burns under the condition that the sintering reaction and the energy of the preheating gas of the sintering system B are not changedThe sintering flue gas discharged by the nodulizer B has large total volume and high unit energy value. Therefore, the sintering flue gas discharged by the B sintering system is relatively high in temperature after being conveyed to the wet desulphurization and denitration system through a pipeline, and the total gas amount is large, SO that the gas is diluted and SO is generated2Is low.
In the application, two branch gas pipelines are branched from a first flue gas conveying pipeline of the sintering system A at the downstream of a main exhaust fan of the sintering system A, and are respectively a first branch connected to a flue gas mixer of the sintering system A and a second branch connected to a flue gas mixer of the sintering system B. The part of the sintering flue gas is mixed with preheated air through a flue gas mixer. The oxygen concentration of the mixed gas is controlled between 16% and 21%, preferably 17% to 20%, and more preferably 18%.
It should be noted that, in order to maintain the combustion reaction of the sintering system, the oxygen content introduced into the flue gas circulation fan housing cannot be lower than 16%; the oxygen content in the atmosphere is 21%. By adjusting the ratio of the circulating flue gas of the first branch and the preheated air of the third flue gas conveying pipeline, the content of oxygen participating in the sintering reaction in the sintering system A can be adjusted. By adjusting the ratio of the circulating flue gas of the second branch and the preheated air of the fourth flue gas conveying pipeline, the content of oxygen participating in the sintering reaction in the sintering system B can be adjusted. The normal sintering of the sintering machine is ensured by controlling the oxygen content in the flue gas input into the flue gas circulation fan cover.
In the present application, the flue gas mixer a is provided with an ammonia gas injection device a; and an ammonia gas injection device B is arranged in the flue gas mixer B. The circulating flue gas and ammonia gas are mixed in a flue gas mixer and are sent into a flue gas circulating fan cover, and NO generated by sintering flue gas is reacted under the action of high temperature generated by sintering reaction of raw materials in a sintering machineXThe NOx removal reaction is carried out with ammonia gas, thereby reducing NO in the sintering flue gas discharged by the sintering machineXThe concentration of (c).
The national environmental protection agency of 6 months in 2017 issues a revised notice of 'emission standards of atmospheric pollutants for the iron and steel sintering and pelletizing industry', and NO is addedx(with NO)2Meter) emission limits from 300mg/Nm3Down-regulated to 100mg/Nm3Flue gas reference for sintering and pellet firingThe oxygen content was 16%. Since the emission content of nitrogen oxides is calculated based on the oxygen content in the exhaust gas in the new emission standard, the content of nitrogen oxides in the exhaust gas is reduced by appropriately reducing the oxygen content in the gas while controlling the content of nitrogen oxides in the gas, and the content of nitrogen oxides in the exhaust gas is also reduced by conversion.
In the invention, the oxygen content of the flue gas discharged by the middle sintering machine of the sintering system A is less than that of the gas discharged from the low-temperature section of the circular cooler. And (3) conveying a part of the flue gas discharged by the middle sintering machine in the sintering system A into a flue gas circulation fan cover of the sintering machine A in the sintering system A, mixing the part of the flue gas with the gas discharged from the low-temperature section of the circular cooler, reducing the oxygen content in the gas entering the sintering machine A, and further reducing the oxygen content in the flue gas discharged from the air pipe of the sintering machine A after the sintering process of the sintering machine A. Meanwhile, after the part of the flue gas circulated to the sintering machine A passes through a sinter bed of the sintering machine A, dioxin is decomposed in the sinter bed at high temperature; injecting ammonia gas into the mixed gas A, and utilizing the high-temperature environment of a sinter bed in the sintering machine A to obtain NOxThe ammonia gas and the ammonia gas have SCR denitration reaction and SNCR denitration reaction on a sinter bed, thereby reducing dioxin and NO in the circulating flue gasxThe content of (a). After the circulating flue gas passes through the sintering machine A again, SO2Is enriched, increases SO in the flue gas discharged from a large flue A2The concentration of the active carbon is beneficial to the subsequent desulfurization and denitrification of the active carbon and the improvement of SO2And (4) recycling. Similarly, the oxygen content of the flue gas discharged by the middle sintering machine of the sintering system A is less than that of the flue gas discharged from the low-temperature section of the circular cooler. And (3) conveying a part of the flue gas discharged by the middle sintering machine in the sintering system A into a flue gas circulation fan cover of the sintering machine B in the sintering system B, mixing the part of the flue gas with the gas discharged from the low-temperature section of the circular cooler, reducing the oxygen content in the gas entering the sintering machine B, and further reducing the oxygen content in the flue gas discharged from an air pipe of the sintering machine B after the sintering process of the sintering machine B. Meanwhile, after the part of the flue gas circulated to the sintering machine B passes through a sintering material layer of the sintering machine B, dioxin is decomposed in the high-temperature sintering material layer; spraying in the mixed gas BAdding ammonia gas, and using the high-temperature environment of the sinter bed in the sintering machine B to obtain NOxThe ammonia gas and the ammonia gas have SCR denitration reaction and SNCR denitration reaction on a sinter bed, thereby reducing dioxin and NO in the circulating flue gasxThe content of (a).
The sintering system A adopts activated carbon for desulfurization and denitrification. Because a part of the flue gas discharged by the sintering machine A in the sintering system A is circulated into the flue gas circulation wind hoods of the sintering machine A and the sintering machine B, the amount of the flue gas conveyed to the activated carbon desulfurization and denitrification system is reduced. The flue gas volume of carrying to active carbon SOx/NOx control system reduces, and after the pipe-line transportation, because thermal scattering and disappearing, flue gas temperature drop is big, leads to the temperature of carrying the flue gas to active carbon SOx/NOx control system lower relatively. Meanwhile, one part of the flue gas is circulated to the sintering machine A, and SO in the circulating flue gas passes through the sintering machine A again2Is enriched to ensure that SO in the flue gas entering the activated carbon desulfurization and denitrification system2The concentration increases. Due to the characteristics of the activated carbon desulfurization and denitrification process, the cost is high, the desulfurization and denitrification efficiency is high, the desulfurization temperature requirement is relatively low, and SO is2The flue gas conveyed from the sintering system A to the activated carbon desulfurization and denitrification system is just in accordance with the characteristics, the activated carbon desulfurization and denitrification system is adopted to treat the part of the flue gas, and the total amount of the flue gas is relatively reduced, so that the cost is saved; the temperature is relatively low, and the method is suitable for desulfurization and denitrification of the activated carbon; SO in flue gas2High concentration, adopts active carbon for desulfurization and denitrification, and improves SO2The recovery rate of the method reduces environmental pollution, and the by-product can generate additional economic value.
The sintering system B adopts wet desulphurization and denitration. Because a part of the flue gas discharged by the sintering machine A in the sintering system A is circulated into the flue gas circulation fan cover of the sintering machine B, the amount of the flue gas conveyed to the wet desulfurization and denitrification system is increased. The flue gas volume of carrying to wet flue gas desulfurization deNOx systems increases, and after the pipeline transport, because thermal scattering and disappearing, flue gas temperature drops for a short time, leads to the temperature of carrying to the flue gas of active carbon desulfurization deNOx systems higher relatively. Meanwhile, one part of the flue gas is circulated to the sintering machine B, and after the circulating flue gas passes through the sintering machine B again, the sintering machine B discharges the flue gasThe flue gas is not circulated, SO that SO in the flue gas entering the wet desulphurization and denitration system2The concentration is relatively low. Due to the characteristics of the wet desulfurization and denitration process, the cost is relatively low, the higher the temperature is, the better the desulfurization and denitration effects are, and the SO2The recycling rate is high, the flue gas conveyed from the sintering system B to the wet desulphurization and denitration system just accords with the characteristics, the wet desulphurization and denitration system is adopted to treat the flue gas, and the total amount of the flue gas is relatively large, so that the cost is saved by adopting the wet desulphurization and denitration system; the temperature is relatively high, and the method is suitable for wet desulphurization and denitration; SO in flue gas2The concentration is relatively low (relative to SO in the entering carbon desulfurization and denitrification flue gas)2Concentration), adopts wet desulfurization and denitration, and effectively recovers SO2And environmental pollution is reduced.
Spraying a reducing agent into the flue gas circulation fan cover or the flue gas mixer, mixing the reducing agent with the circulation flue gas, and taking the sintered ore material on the sintering machine as a reaction bed, wherein the reducing agent and Nitrogen Oxide (NO) in the flue gasx) SNCR denitration reaction and SCR denitration reaction are carried out to generate nitrogen, thereby treating NO in the flue gasx. In the prior art, flue gas discharged from a sintering machine is directly discharged after desulfurization treatment and dust removal treatment, the invention changes the technology, the part of flue gas is sent into a flue gas circulation fan cover of the sintering machine, and simultaneously a reducing agent is sprayed into the flue gas circulation fan cover or a flue gas mixer, thereby realizing SNCR (selective non-catalytic reduction) denitration and SCR (selective catalytic reduction) denitration by utilizing the high-temperature environment in the sintering machine and reducing the content of nitrogen oxides in the flue gas. The process is circulated continuously, and the content of nitrogen oxides in the flue gas of the sintering machine discharged from a chimney can be controlled to be 100mg/Nm3The following.
In the invention, the process recycles a part of the flue gas with high oxygen content (the part of the flue gas is directly discharged in the prior art) to the sintering machine, and the oxygen in the part of the recycled flue gas is consumed by ignition sintering, so that the oxygen content in the discharged gas is reduced, and the content of nitrogen oxide in the discharged gas is further reduced.
In this application, part of the sintering gas is circulated and re-participates in sintering, and the dust therein will be partially adsorbed to the materialIn layer of NOXThe compound is partially degraded, dioxin is pyrolyzed, and SO2The smoke is enriched through the processes of absorption and re-release; in A sintering system, the total amount of flue gas that A sintering machine of sintering system got into the SOx/NOx control system reduces, and flue gas temperature is also lower relatively, and the concentration of sulphide can rise in the unit volume, and overall nitride reduces, and the dust reduces, and dioxin concentration reduces, is favorable to improving among the A sintering system the desorption efficiency of active carbon SOx/NOx control system to the sulphide, improves the production efficiency of A sintering system, reduction in production cost. In the B sintering system, the total amount of flue gas that B sintering system sintering machine got into the SOx/NOx control system increases, and flue gas temperature is higher relatively, and the concentration of sulphide in the unit volume reduces, and overall nitride reduces, and the dust reduces, and dioxin concentration reduces, is favorable to reducing the use of B sintering system catalyst, reduces the production of pollutant, reduces the pollutant treatment cost, reduction in production cost.
In this application, two branch road trachea of branch off at A sintering system main air exhauster A downstream, reform transform with low costsly, the production efficiency and the reduction in production cost of improvement two sintering systems that can be further.
In the application, the circulation of the high-temperature sintering flue gas can further promote the combustion reaction of the raw materials, and reduce the consumption of fuel during ignition and hot air sintering
In the application, the raw materials after sintering respectively enter a circular cooler A of a sintering system A and a circular cooler B of a sintering system B. The ring cooling machine is in a ring shape and is divided into 3 sections, the part of the sintered raw material which flows through at the first time is defined as a high-temperature section, the part of the sintered raw material which flows through after the high-temperature section is defined as a medium-temperature section, and the part of the sintered raw material which flows through at last is defined as a low-temperature section. Air blown by the air blower is introduced into each temperature section, and after the air and the air of each temperature section are subjected to sufficient heat exchange, the preheated air of each temperature section is extracted by the independent exhaust fan. And hot gas generated by cooling the high-temperature section of the circular cooler is used for performing waste heat power generation. The hot gas generated by the cooling of the middle temperature section is used for being combined with an ignition furnace on a sintering machine for ignition and sintering, and provides oxygen for igniting the raw materials. The low-temperature hot gas generated by cooling the low-temperature section is used for mixing with the sintering flue gas of the flue gas mixer, adjusting the oxygen concentration and providing oxygen for maintaining the combustion of the raw materials.
In the present invention, the total length of the pallet of the sintering machine a (i.e., the effective draft length of the sintering machine) is 60 to 160 meters, preferably 70 to 150 meters, and more preferably 80 to 140 meters. The total length of a sintering pallet is the sum of the lengths of all pallets on the sintering machine. The number of windboxes of the sintering machine A is 20 to 40, preferably 22 to 36, and more preferably 24 to 32. The number of the windboxes covered by the flue gas circulation wind cover arranged above the sintering machine A is 12-24, preferably 14-22, and more preferably 16-20.
The total length of the pallet of the sintering machine B (i.e., the effective draft length of the sintering machine) is 60 to 160 meters, preferably 70 to 150 meters, and more preferably 80 to 140 meters. The total length of a sintering pallet is the sum of the lengths of all pallets on the sintering machine. The number of windboxes of the sintering machine B is 20 to 40, preferably 22 to 36, and more preferably 24 to 32. The number of windboxes covered by the flue gas circulation hood provided above the sintering machine B is 12 to 24, preferably 14 to 22, and more preferably 16 to 20.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can realize further energy conservation and emission reduction, carries out matching combination transformation on subsequent flue gas treatment equipment, effectively and organically combines the high-cost active carbon desulfurization and denitrification device with the low-cost conventional wet desulfurization and denitrification device, achieves the best desulfurization and denitrification effect, reduces the total investment cost, reduces the running cost in the process and is convenient for transforming the traditional double-series sintering system.
2. The flue gas circulation process has the advantage of high flue gas circulation rate, the flue gas circulates to the sintering machine to participate in sintering, the high-temperature flue gas can further promote the sintering reaction, and a little fuel can be saved; the smoke circulation sealing cover is arranged on the sintering machine, so that the air environment around the sintering machine is improved, the leakage of waste gas is avoided, and the environment protection is facilitated;
3. the invention can reduce the emission of flue gas, and after part of sintering gas participates in circulation, the emission of flue gas of two sintering systems is correspondingly reduced, so that the subsequent sintering flue gas treatment capacity of the two systems is improved, the emission of flue gas is reduced, the environmental protection requirement is facilitated, the cost and resources are saved, and the energy conservation and emission reduction are realized;
4. the flue gas circulation process can recover the waste heat of sintering waste gas, reduce the emission of flue gas, degrade partial pollutants, enrich sulfur dioxide, reduce the energy consumption of a subsequent desulfurization system and reduce the operation cost.
Drawings
FIG. 1 is a schematic diagram of the main structure of a dual-series sintering system according to the present invention;
FIG. 2 is a schematic diagram of a series A sintering system according to the present invention;
FIG. 3 is a schematic structural diagram of a B-series sintering system according to the present invention.
Reference numerals:
1: a, sintering a system; 101: a sintering machine A; 10101: an air box branch pipe A; 10102: a large flue A; 102: a circular cooler A; 103: a main exhaust fan A; 104: an activated carbon desulfurization and denitrification system; 105: circulating fan a 1; 106: a flue gas mixer A; 107: circulating fan a 2; 108: a dust remover A; 109: an ammonia gas injection device A; 2: b, sintering the system; 201: b, sintering machine B; 20101: an air box branch pipe B; 20102: a large flue B; 202: a circular cooler B; 203: a main exhaust fan B; 204: a wet desulfurization and denitrification system; 205: a circulation fan B1; 206: a flue gas mixer B; 207: a circulation fan B2; 208: a dust remover B; 209: an ammonia gas injection device B;
l1: a first flue gas delivery duct; l1 a: a first branch; l1 b: a second branch circuit; l3: a third flue gas delivery duct; l4: a fourth flue gas delivery duct.
Detailed Description
A comprehensive circulation treatment method for flue gas of a double-series sintering system comprises an A sintering system 1 and a B sintering system 2, and comprises the following steps:
1) and (3) sintering: the sintering materials are respectively loaded on the sintering machines in the sintering system A1 and the sintering system B2, then ignition combustion is carried out on the sintering materials on the sintering machines through an ignition furnace arranged at the front part of the sintering machines, and then hot air from the circular cooler is introduced for combustion-supporting sintering; air above the sintering machine is independently pumped into sintering materials on the sintering machine by a main exhaust fan A103 of the sintering system A1 and a main exhaust fan B203 of the sintering system B2; flue gas generated by the sintering machine in the sintering system A1 enters a large flue A10102 in the sintering system A1, and flue gas generated by the sintering machine in the sintering system B2 enters a large flue B20102 in the sintering system B2;
2) and (3) cooling: the mineral aggregate which is sintered by the sintering machine enters the circular cooler for cooling, and the cooling gas and the mineral aggregate sintered by the sintering machine are cooled through heat exchange;
3) flue gas treatment: after passing through a main exhaust fan A103, flue gas in the large flue A10102 is conveyed to an activated carbon desulfurization and denitrification system 104 through a first flue gas conveying pipeline L1 for desulfurization and denitrification treatment; after passing through a main exhaust fan B203, the flue gas in the large flue B20102 is conveyed to a wet desulfurization and denitrification system 204 through a second flue gas conveying pipeline L2 for desulfurization and denitrification treatment;
wherein: after the flue gas in the large flue A10102 passes through a main exhaust fan A103, a first flue gas conveying pipeline L1 is divided into two branches, wherein the first branch L1a is connected into a flue gas circulation fan housing of a sintering machine A101 in a sintering system A1, and the second branch L1B is connected into a flue gas circulation fan housing of a sintering machine B201 in a sintering system B2; the flue gas in the large flue a10102 is conveyed to:
firstly, the activated carbon desulfurization and denitrification system 104 carries out desulfurization and denitrification treatment,
② the flue gas circulation fan cover of the sintering machine in the sintering system A1 is used for sintering of the sintering machine in the sintering system A1,
and thirdly, the flue gas circulation fan cover of the sintering machine in the sintering system B2 is used for sintering the sintering machine in the sintering system B2.
Preferably, 40-90 (vol)% of the flue gas in the large flue A10102 is conveyed to the activated carbon desulfurization and denitrification system 104; preferably 45-85 (vol)% is conveyed to the activated carbon desulfurization and denitrification system 104; more preferably 50-80 (vol)% is delivered to the activated carbon desulfurization and denitrification system 104.
Preferably, 5-40 (vol)% of the flue gas in the large flue A10102 is conveyed into a flue gas circulating fan cover of the sintering machine A in the sintering system A1; preferably 10-35 (vol)% is conveyed into a flue gas circulation fan cover of a sintering machine A in the sintering system A1; more preferably 15-30 (vol)% is fed into the flue gas circulation hood of sintering machine a in sintering system a 1.
Preferably, 5-40 (vol)% of the flue gas in the large flue A10102 is conveyed into a flue gas circulating fan cover of a sintering machine B in the sintering system B2; preferably 10-35 (vol)% is conveyed into a flue gas circulating fan cover of a sintering machine B in the sintering system B2; more preferably 15-30 (vol)% is conveyed to the flue gas circulation hood of the sintering machine B in the B sintering system 2.
Preferably, the flue gas conveyed by the first branch L1a and the gas discharged from the low-temperature section of the circular cooler in the sintering system A1 are mixed by the flue gas mixer a106 and then conveyed into the flue gas circulation hood of the sintering machine a in the sintering system A1.
Preferably, the flue gas conveyed by the second branch L1B and the gas discharged from the low-temperature section of the circular cooler in the B sintering system 2 are mixed by the flue gas mixer B206 and then conveyed into the flue gas circulation hood of the sintering machine B in the B sintering system 2.
Preferably, the flue gas in the large flue a10102 is dedusted by the deduster a108, and then is conveyed to the activated carbon desulfurization and denitrification system 104 through the first flue gas conveying pipeline L1 by the main exhaust fan a103 for desulfurization and denitrification treatment.
Preferably, the dust remover a108 is an electric dust remover.
Preferably, after dust is removed by the flue gas dust remover B208 in the large flue B20102, the flue gas is conveyed to the wet desulfurization and denitrification system 204 through the second flue gas conveying pipeline L2 by the main exhaust fan B203 for desulfurization and denitrification treatment; preferably, the dust collector B208 is an electric dust collector.
Preferably, the flue gas conveyed by the first branch L1a and the gas discharged from the low-temperature section of the circular cooler in the sintering system A1 are mixed by a flue gas mixer a106 to obtain a mixed gas a; the oxygen content in the mixed gas A is not less than 17% (vol), preferably not less than 17.5% (vol), more preferably not less than 18% (vol).
Preferably, the flue gas conveyed by the second branch L1B and the gas discharged from the low-temperature section of the circular cooler in the sintering system 2B are mixed by a flue gas mixer B206 to obtain a mixed gas B; the oxygen content in the mixed gas B is not less than 17% (vol), preferably not less than 17.5% (vol), more preferably not less than 18% (vol).
Preferably, an ammonia gas injection device A109 is arranged in the flue gas mixer A106, the ammonia gas injection device A109 injects ammonia gas, the ammonia gas is mixed and enters the mixed gas A, the mixed gas A is conveyed into a flue gas circulation fan cover of a sintering machine in the sintering system A1, and NO in the mixed gas AxAnd carrying out SCR denitration reaction with ammonia gas in a flue gas circulation fan cover of the sintering machine.
Preferably, an ammonia gas injection device B209 is arranged in the flue gas mixer B206, the ammonia gas injection device B209 injects ammonia gas to be mixed into the mixed gas B, the mixed gas B is conveyed into a flue gas circulation fan cover of a sintering machine in the sintering system B2, and NO in the mixed gas BxAnd carrying out SCR denitration reaction with ammonia gas in a flue gas circulation fan cover of the sintering machine.
A double-series sintering system flue gas comprehensive circulation treatment device or a device for a double-series sintering system flue gas comprehensive circulation treatment method comprises an A sintering system 1 and a B sintering system 2; the sintering system A comprises a sintering machine A101, a circular cooler A102, a main exhaust fan A103 and an active carbon desulfurization and denitrification system 104; the sintering system B2 comprises a sintering machine B201, a circular cooler B202, a main exhaust fan B203 and a wet desulfurization and denitrification system 204;
the air box of the sintering machine A101 is connected to a large flue A10102 through an air box branch pipe A10101, the large flue A10102 is connected to an activated carbon desulfurization and denitrification system 104 through a first flue gas conveying pipeline L1, and a low-temperature section gas outlet of the annular cooling machine A102 is connected into a flue gas circulation fan cover of the sintering machine A101 through a third flue gas conveying pipeline L3; a main exhaust fan A103 is arranged on the first flue gas conveying pipeline L1;
an air box of the sintering machine B201 is connected to a large flue B20102 through an air box branch pipe B20101, the large flue B20102 is connected to a wet desulfurization and denitrification system 204 through a second flue gas conveying pipeline L2, and a low-temperature section gas outlet of the annular cooling machine B202 is connected into a flue gas circulation fan housing of the sintering machine B201 through a fourth flue gas conveying pipeline L4; a main exhaust fan B203 is arranged on the second flue gas conveying pipeline L2;
wherein: the first flue gas conveying pipeline L1 is divided into two branches, wherein the first branch L1a is connected into a flue gas circulation fan housing of the sintering machine A101, and the second branch L1B is connected into a flue gas circulation fan housing of the sintering machine B201; a circulating fan A1105 is arranged on the first branch L1a, and a circulating fan B1205 is arranged on the second branch L1B.
Preferably, the device further comprises a flue gas mixer a106, the end of the first branch L1a is connected to the flue gas mixer a106, the end of the third flue gas conveying pipeline L3 is connected to the flue gas mixer a106, and the gas outlet of the flue gas mixer a106 is connected to the flue gas circulation fan housing of the sintering machine a 101.
Preferably, the third flue gas conveying pipeline L3 is provided with a circulating fan a 2107.
Preferably, the device further comprises a flue gas mixer B206, the end of the second branch L1B is connected to the flue gas mixer B206, the end of the fourth flue gas conveying pipeline L4 is connected to the flue gas mixer B206, and the gas outlet of the flue gas mixer B206 is connected to the flue gas circulation fan housing of the sintering machine B201.
Preferably, the fourth flue gas duct L4 is provided with a circulation fan B2107.
Preferably, the first flue gas conveying pipeline L1 is provided with a dust remover a 108.
Preferably, a scrubber A108 is provided upstream of the main blower A103.
Preferably, the dust collector a108 is an electric dust collector.
The second flue gas conveying pipeline L2 is provided with a dust remover B208.
Preferably, the dust separator B208 is arranged upstream of the main blower B203.
Preferably, the dust collector B208 is an electric dust collector.
Preferably, an ammonia gas injection device a109 is provided in the flue gas circulation hood of the sintering machine a101 or in the flue gas mixer a 106.
Preferably, an ammonia gas injection device B209 is provided in the flue gas circulation hood of the sintering machine B201 or in the flue gas mixer B206.
Example 1
A comprehensive circulation treatment method for flue gas of a double-series sintering system comprises an A sintering system 1 and a B sintering system 2, and comprises the following steps:
1) and (3) sintering: the sintering materials are respectively loaded on the sintering machines in the sintering system A1 and the sintering system B2, then ignition combustion is carried out on the sintering materials on the sintering machines through an ignition furnace arranged at the front part of the sintering machines, and then hot air from the circular cooler is introduced for combustion-supporting sintering; air above the sintering machine is independently pumped into sintering materials on the sintering machine by a main exhaust fan A103 of the sintering system A1 and a main exhaust fan B203 of the sintering system B2; flue gas generated by the sintering machine in the sintering system A1 enters a large flue A10102 in the sintering system A1, and flue gas generated by the sintering machine in the sintering system B2 enters a large flue B20102 in the sintering system B2;
2) and (3) cooling: the mineral aggregate which is sintered by the sintering machine enters the circular cooler for cooling, and the cooling gas and the mineral aggregate sintered by the sintering machine are cooled through heat exchange;
3) flue gas treatment: after passing through a main exhaust fan A103, flue gas in the large flue A10102 is conveyed to an activated carbon desulfurization and denitrification system 104 through a first flue gas conveying pipeline L1 for desulfurization and denitrification treatment; after passing through a main exhaust fan B203, flue gas in the large flue B20102 is conveyed to a wet desulfurization and denitrification system 204 through a second flue gas conveying pipeline L2 for desulfurization and denitrification treatment;
wherein: after the flue gas in the large flue A10102 passes through a main exhaust fan A103, a first flue gas conveying pipeline L1 is divided into two branches, wherein the first branch L1a is connected into a flue gas circulation fan housing of a sintering machine A101 in a sintering system A1, and the second branch L1B is connected into a flue gas circulation fan housing of a sintering machine B201 in a sintering system B2; the flue gas in the large flue a10102 is conveyed to:
firstly, the activated carbon desulfurization and denitrification system 104 carries out desulfurization and denitrification treatment,
② the flue gas circulation fan cover of the sintering machine in the sintering system A1 is used for sintering of the sintering machine in the sintering system A1,
and thirdly, the flue gas circulation fan cover of the sintering machine in the sintering system B2 is used for sintering the sintering machine in the sintering system B2.
Example 2
Example 1 was repeated except that 60 (vol)% of the flue gas in the large flue A10102 was fed to the activated carbon desulfurization and denitrification system 104. 20 (vol)% of the flue gas in the large flue A10102 is conveyed into a flue gas circulating fan housing of the sintering machine A in the sintering system A1. 20 (vol)% of the flue gas in the large flue A10102 is conveyed into a flue gas circulating fan cover of a sintering machine B in the sintering system B2.
Example 3
Example 2 was repeated except that 70 (vol)% of the flue gas in the large flue A10102 was supplied to the activated carbon desulfurization and denitrification system 104. 15 (vol)% of the flue gas in the large flue A10102 is conveyed into a flue gas circulating fan cover of the sintering machine A in the sintering system A1. 15 (vol)% of the flue gas in the large flue A10102 is conveyed into a flue gas circulating fan cover of a sintering machine B in the sintering system B2.
Example 4
Example 3 was repeated except that the flue gas conveyed by the first branch L1a and the flue gas discharged from the low temperature section of the cold machine in the sintering system A1 were mixed by the flue gas mixer a106 and conveyed into the flue gas circulation hood of the sintering machine a in the sintering system A1. The flue gas conveyed by the second branch L1B and the gas discharged from the low-temperature section of the circular cooler in the sintering system B2 are mixed by a flue gas mixer B206 and then conveyed into a flue gas circulation fan housing of the sintering machine B in the sintering system B2.
Example 5
Example 4 is repeated, except that the flue gas in the large flue a10102 is dedusted by the deduster a108, and then is conveyed to the activated carbon desulfurization and denitrification system 104 by the main exhaust fan a103 through the first flue gas conveying pipeline L1 for desulfurization and denitrification treatment. The dust remover A108 is an electric dust remover.
Example 6
Example 4 is repeated, except that the flue gas deduster B208 in the large flue B20102 removes dust, and the dust is conveyed to the wet desulfurization and denitrification system 204 through the second flue gas conveying pipeline L2 by the main exhaust fan B203 for desulfurization and denitrification treatment. The dust remover B208 is an electric dust remover.
Example 7
Example 6 is repeated, except that the flue gas conveyed by the first branch L1a and the gas discharged from the low temperature section of the circular cooler in the sintering system 1a are mixed by a flue gas mixer a106 to obtain a mixed gas a; the oxygen content in the mixed gas A was 17% (vol). The flue gas conveyed by the second branch L1B and the gas discharged by the low-temperature section of the circular cooler in the sintering system B2 are mixed by a flue gas mixer B206 to obtain a mixed gas B; the oxygen content in the mixed gas B is not less than 17% (vol).
Example 8
Example 7 is repeated except that the flue gas conveyed by the first branch L1a and the gas discharged from the low-temperature section of the circular cooler in the sintering system 1a are mixed by a flue gas mixer a106 to obtain a mixed gas a; the oxygen content in the mixed gas A was 18% (vol). The flue gas conveyed by the second branch L1B and the gas discharged by the low-temperature section of the circular cooler in the sintering system B2 are mixed by a flue gas mixer B206 to obtain a mixed gas B; the oxygen content in the mixed gas B is 18% (vol) or more.
Example 9
Example 7 was repeated except that the flue gas mixer a106 was internally provided with an ammonia gas injection device a109, the ammonia gas injection device a109 injected ammonia gas, mixed into the mixed gas a, the mixed gas a was transported into the flue gas circulation hood of the sintering machine in the sintering system A1, and NO in the mixed gas axAnd carrying out SCR denitration reaction with ammonia gas in a flue gas circulation fan cover of the sintering machine. An ammonia gas injection device B209 is arranged in the flue gas mixer B206, the ammonia gas injection device B209 injects ammonia gas, the ammonia gas is mixed and enters a mixed gas B, the mixed gas B is conveyed into a flue gas circulation fan cover of a sintering machine in the sintering system B2, and NO in the mixed gas BxAnd carrying out SCR denitration reaction with ammonia gas in a flue gas circulation fan cover of the sintering machine.
Example 10
A double-series sintering system flue gas comprehensive circulation treatment device or a device for a double-series sintering system flue gas comprehensive circulation treatment method comprises an A sintering system 1 and a B sintering system 2; the sintering system A comprises a sintering machine A101, a circular cooler A102, a main exhaust fan A103 and an active carbon desulfurization and denitrification system 104; the sintering system B2 comprises a sintering machine B201, a circular cooler B202, a main exhaust fan B203 and a wet desulfurization and denitrification system 204.
The air box of the sintering machine A101 is connected to a large flue A10102 through an air box branch pipe A10101, the large flue A10102 is connected to an activated carbon desulfurization and denitrification system 104 through a first flue gas conveying pipeline L1, and a low-temperature section gas outlet of the annular cooler A102 is connected into a flue gas circulation fan cover of the sintering machine A101 through a third flue gas conveying pipeline L3; the main exhaust fan A103 is arranged on the first flue gas conveying pipeline L1.
An air box of the sintering machine B201 is connected to a large flue B20102 through an air box branch pipe B20101, the large flue B20102 is connected to a wet desulphurization and denitration system 204 through a second flue gas conveying pipeline L2, and a low-temperature section gas outlet of the annular cooling machine B202 is connected into a flue gas circulation fan cover of the sintering machine B201 through a fourth flue gas conveying pipeline L4; the second flue gas conveying pipeline L2 is provided with a main exhaust fan B203.
Wherein: the first flue gas conveying pipeline L1 is divided into two branches, wherein the first branch L1a is connected into a flue gas circulation fan housing of the sintering machine A101, and the second branch L1B is connected into a flue gas circulation fan housing of the sintering machine B201; a circulating fan A1105 is arranged on the first branch L1a, and a circulating fan B1205 is arranged on the second branch L1B.
Example 11
Example 10 is repeated, except that the apparatus further comprises a flue gas mixer a106, the end of the first branch L1a is connected to the flue gas mixer a106, the end of the third flue gas conveying pipeline L3 is connected to the flue gas mixer a106, and the gas outlet of the flue gas mixer a106 is connected to the flue gas circulation fan housing of the sintering machine a 101. And a circulating fan A2107 is arranged on the third flue gas conveying pipeline L3.
Example 12
Example 11 is repeated, except that the apparatus further comprises a flue gas mixer B206, the end of the second branch L1B is connected to the flue gas mixer B206, the end of the fourth flue gas conveying pipeline L4 is connected to the flue gas mixer B206, and the gas outlet of the flue gas mixer B206 is connected to the flue gas circulation fan housing of the sintering machine B201. A circulating fan B2107 is arranged on the fourth flue gas conveying pipeline L4.
Example 13
Example 12 was repeated except that the first flue gas duct L1 was provided with a dust separator A108. A scrubber a108 is arranged upstream of the main blower a 103. Dust collector a108 is an electric dust collector.
Example 14
Example 13 is repeated, except that the second flue gas duct L2 is provided with a dust separator B208. A dust separator B208 is provided upstream of the main blower B203. The dust collector B208 is an electric dust collector.
Example 15
Example 14 was repeated except that the ammonia gas injection device a109 was provided in the flue gas circulation hood of the sintering machine a101 or in the flue gas mixer a 106.
Example 16
Example 15 was repeated except that an ammonia gas injection device B209 was provided in the flue gas circulation hood of the sintering machine B201 or in the flue gas mixer B206.
If the flue gas circulation method is not adopted in the double-series sintering system, the flue gas is normally discharged respectively, and the discharged flue gas amount of each single-series sintering system is 30000m3And/min, 50-55kg of fuel is consumed for each ton of sinter. After the scheme of the embodiment 16 of the invention is adopted, as the flue gas is recycled, the emission is reduced, the emission can be reduced by 17-20%, and meanwhile, the peripheral working environment of the ring cooler can be improved by utilizing the unorganized externally-discharged waste gas at the low-temperature section of the ring cooler, thus having important significance for reducing emission and improving the environment. After the flue gas circulation process is adopted, the sensible heat of the gas is used for replacing part of solid fuel, the fuel is saved by 1.13-1.5kg of coal per ton of sinter, and therefore, CO generated in the original production is reduced2The amount can be effectively reduced, and CO can be reduced per ton of sinter2The discharge amount is 1.5-2.0 kg. By adopting the flue gas circulation process, the quenching phenomenon of the surface layer sinter can be reduced, the drum strength and the yield of the sinter can be effectively improved, and the flue gas circulation process is favorable for improving the yield of two sintering machines. And after the flue gas circulation system is added, the load of the main exhaust fan is reduced, different desulfurization and denitrification systems are effectively configured, and the purpose of saving cost is achieved.

Claims (23)

1. A comprehensive circulation treatment method for flue gas of a double-series sintering system comprises an A sintering system (1) and a B sintering system (2), and the method comprises the following steps:
1) and (3) sintering: the sintering materials are respectively loaded on the sintering machines in the sintering system A (1) and the sintering system B (2), then ignition combustion is carried out on the sintering materials on the sintering machines through an ignition furnace arranged at the front part of the sintering machines, and then hot air from a circular cooler is introduced for combustion-supporting sintering; air above the sintering machine is independently pumped into sintering materials on the sintering machine by a main exhaust fan A (103) of the sintering system A (1) and a main exhaust fan B (203) of the sintering system B (2); flue gas generated by the sintering machine in the sintering system A (1) enters a large flue A (10102) in the sintering system A (1), and flue gas generated by the sintering machine in the sintering system B (2) enters a large flue B (20102) in the sintering system B (2);
2) and (3) cooling: the mineral aggregate which is sintered by the sintering machine enters the circular cooler for cooling, and the cooling gas and the mineral aggregate sintered by the sintering machine are cooled through heat exchange;
3) flue gas treatment: after passing through a main exhaust fan A (103), flue gas in a large flue A (10102) is conveyed to an activated carbon desulfurization and denitrification system (104) through a first flue gas conveying pipeline (L1) for desulfurization and denitrification treatment; after passing through a main exhaust fan B (203), flue gas in the large flue B (20102) is conveyed to a wet desulfurization and denitrification system (204) through a second flue gas conveying pipeline (L2) for desulfurization and denitrification treatment;
the method is characterized in that: after the flue gas in the large flue A (10102) passes through a main exhaust fan A (103), a first flue gas conveying pipeline (L1) is divided into two branches, wherein the first branch (L1 a) is connected into a flue gas circulation fan housing of a sintering machine in a sintering system A (1), and the second branch (L1B) is connected into a flue gas circulation fan housing of a sintering machine in a sintering system B (2); the flue gas in the large flue a (10102) is conveyed to:
firstly, an active carbon desulfurization and denitrification system (104) carries out desulfurization and denitrification treatment,
② the flue gas circulation fan cover of the sintering machine in the sintering system A (1) is used for sintering the sintering machine in the sintering system A (1),
thirdly, the flue gas circulation fan cover of the sintering machine in the sintering system B (2) is used for sintering the sintering machine in the sintering system B (2);
wherein: 40-90vol% of flue gas in the large flue A (10102) is conveyed to an activated carbon desulfurization and denitrification system (104);
5-40vol% of flue gas in the large flue A (10102) is conveyed into a flue gas circulating fan cover of a sintering machine in the sintering system A (1);
5-40vol% of flue gas in the large flue A (10102) is conveyed into a flue gas circulating fan cover of a sintering machine in the sintering system B (2).
2. The comprehensive circulation treatment method for flue gas of a double-series sintering system according to claim 1, characterized in that: 45-85vol% of flue gas in the large flue A (10102) is conveyed to an activated carbon desulfurization and denitrification system (104); and/or
10-35vol% of flue gas in the large flue A (10102) is conveyed into a flue gas circulating fan cover of a sintering machine in the sintering system A (1); and/or
10-35vol% of flue gas in the large flue A (10102) is conveyed into a flue gas circulating fan cover of a sintering machine in the sintering system B (2).
3. The comprehensive circulation treatment method for flue gas of a double-series sintering system according to claim 2, characterized in that: 50-80vol% of flue gas in the large flue A (10102) is conveyed to an activated carbon desulfurization and denitrification system (104); and/or
15-30vol% of flue gas in the large flue A (10102) is conveyed into a flue gas circulating fan cover of a sintering machine in the sintering system A (1); and/or
15-30vol% of flue gas in the large flue A (10102) is conveyed into a flue gas circulating fan cover of a sintering machine in the sintering system B (2).
4. The double-series sintering system flue gas comprehensive circulation treatment method according to any one of claims 1 to 3, characterized in that: the flue gas conveyed by the first branch (L1 a) and the gas discharged by the low-temperature section of the circular cooler in the sintering system A (1) are mixed by a flue gas mixer A (106) and then conveyed into a flue gas circulation fan cover of the sintering machine in the sintering system A (1); and/or
The flue gas conveyed by the second branch (L1B) and the gas discharged from the low-temperature section of the circular cooler in the sintering system B (2) are mixed by a flue gas mixer B (206) and then conveyed into a flue gas circulation fan cover of the sintering machine in the sintering system B (2).
5. The double-series sintering system flue gas comprehensive circulation treatment method according to any one of claims 1 to 3, characterized in that: after the flue gas in the large flue A (10102) is dedusted by a deduster A (108), the flue gas is conveyed to an activated carbon desulfurization and denitrification system (104) through a first flue gas conveying pipeline (L1) by a main exhaust fan A (103) for desulfurization and denitrification treatment; and/or
And after dust is removed by a flue gas dust remover B (208) in the large flue B (20102), the flue gas dust remover B passes through a main exhaust fan B (203) and then is conveyed to a wet desulfurization and denitrification system (204) through a second flue gas conveying pipeline (L2) for desulfurization and denitrification treatment.
6. The comprehensive circulation treatment method for flue gas of a double-series sintering system according to claim 4, characterized in that: after the flue gas in the large flue A (10102) is dedusted by a deduster A (108), the flue gas is conveyed to an activated carbon desulfurization and denitrification system (104) through a first flue gas conveying pipeline (L1) by a main exhaust fan A (103) for desulfurization and denitrification treatment; and/or
And after dust is removed by a flue gas dust remover B (208) in the large flue B (20102), the flue gas dust remover B passes through a main exhaust fan B (203) and then is conveyed to a wet desulfurization and denitrification system (204) through a second flue gas conveying pipeline (L2) for desulfurization and denitrification treatment.
7. The comprehensive circulation treatment method for flue gas of a double-series sintering system according to claim 5, characterized in that: the dust remover A (108) is an electric dust remover; and/or
The dust remover B (208) is an electric dust remover.
8. The comprehensive circulation treatment method for flue gas of a double-series sintering system according to claim 6, characterized in that: the dust remover A (108) is an electric dust remover; and/or
The dust remover B (208) is an electric dust remover.
9. The comprehensive circulation treatment method for flue gas of a double-series sintering system according to claim 4, characterized in that: mixing the flue gas conveyed by the first branch (L1 a) and the gas discharged by the low-temperature section of the circular cooler in the sintering system A (1) by a flue gas mixer A (106) to obtain a mixed gas A; the oxygen content in the mixed gas A is more than or equal to 17 vol%; and/or
Mixing the flue gas conveyed by the second branch (L1B) and the gas discharged by the low-temperature section of the circular cooler in the sintering system B (2) by a flue gas mixer B (206) to obtain a mixed gas B; the oxygen content in the mixed gas B is not less than 17 vol%.
10. The double-series sintering system flue gas comprehensive circulation treatment method according to any one of claims 6 to 8, characterized in that: mixing the flue gas conveyed by the first branch (L1 a) and the gas discharged by the low-temperature section of the circular cooler in the sintering system A (1) by a flue gas mixer A (106) to obtain a mixed gas A; the oxygen content in the mixed gas A is more than or equal to 17 vol%; and/or
Mixing the flue gas conveyed by the second branch (L1B) and the gas discharged by the low-temperature section of the circular cooler in the sintering system B (2) by a flue gas mixer B (206) to obtain a mixed gas B; the oxygen content in the mixed gas B is not less than 17 vol%.
11. The comprehensive circulation treatment method for flue gas of a double-series sintering system according to claim 9, characterized in that: the oxygen content in the mixed gas A is more than or equal to 17.5 vol%; and/or
The oxygen content in the mixed gas B is not less than 17.5 vol%.
12. The comprehensive circulation treatment method for flue gas of a double-series sintering system according to claim 10, characterized in that: the oxygen content in the mixed gas A is more than or equal to 17.5 vol%; and/or
The oxygen content in the mixed gas B is not less than 17.5 vol%.
13. The double-series sintering system flue gas comprehensive circulation treatment method according to claim 11 or 12, characterized in that: the oxygen content in the mixed gas A is more than or equal to 18 vol%; and/or
The oxygen content in the mixed gas B is 18vol% or more.
14. The double-series sintering system flue gas comprehensive circulation treatment method according to any one of claims 9 and 11-12, characterized in that: an ammonia gas injection device A (109) is arranged in the flue gas mixer A (106), the ammonia gas injection device A (109) injects ammonia gas, the ammonia gas is mixed and enters a mixed gas A, the mixed gas A is conveyed into a flue gas circulation fan cover of a sintering machine in the sintering system A (1), and NO in the mixed gas AxCarrying out SCR denitration reaction with ammonia gas in a flue gas circulation fan cover of the sintering machine; and/or
An ammonia gas injection device B (209) is arranged in the flue gas mixer B (206), the ammonia gas injection device B (209) injects ammonia gas, the ammonia gas is mixed and enters a mixed gas B, the mixed gas B is conveyed into a flue gas circulation fan cover of a sintering machine in a sintering system B (2), and NO in the mixed gas BxAnd carrying out SCR denitration reaction with ammonia gas in a flue gas circulation fan cover of the sintering machine.
15. The comprehensive circulation treatment method for flue gas of a double-series sintering system according to claim 10, characterized in that: an ammonia gas injection device A (109) is arranged in the flue gas mixer A (106), the ammonia gas injection device A (109) injects ammonia gas, the ammonia gas is mixed and enters a mixed gas A, the mixed gas A is conveyed into a flue gas circulation fan cover of a sintering machine in the sintering system A (1), and NO in the mixed gas AxCarrying out SCR denitration reaction with ammonia gas in a flue gas circulation fan cover of the sintering machine; and/or
An ammonia gas injection device B (209) is arranged in the flue gas mixer B (206), the ammonia gas injection device B (209) injects ammonia gas, the ammonia gas is mixed and enters a mixed gas B, the mixed gas B is conveyed into a flue gas circulation fan cover of a sintering machine in a sintering system B (2), and NO in the mixed gas BxAnd carrying out SCR denitration reaction with ammonia gas in a flue gas circulation fan cover of the sintering machine.
16. A double-series sintering system flue gas integrated cycle treatment device used for the treatment method of any one of claims 1 to 15, which comprises an A sintering system (1) and a B sintering system (2); the sintering system A (1) comprises a sintering machine A (101), an annular cooler A (102), a main exhaust fan A (103) and an active carbon desulfurization and denitrification system (104); the sintering system B (2) comprises a sintering machine B (201), an annular cooler B (202), a main exhaust fan B (203) and a wet desulfurization and denitrification system (204);
the air box of the sintering machine A (101) is connected to a large flue A (10102) through an air box branch pipe A (10101), the large flue A (10102) is connected to an activated carbon desulfurization and denitrification system (104) through a first flue gas conveying pipeline (L1), and a low-temperature section gas outlet of the annular cooler A (102) is connected into a flue gas circulation fan cover of the sintering machine A (101) through a third flue gas conveying pipeline (L3); a main exhaust fan A (103) is arranged on the first flue gas conveying pipeline (L1);
an air box of the sintering machine B (201) is connected to a large flue B (20102) through an air box branch pipe B (20101), the large flue B (20102) is connected to a wet desulfurization and denitrification system (204) through a second flue gas conveying pipeline (L2), and a low-temperature section gas outlet of the annular cooler B (202) is connected into a flue gas circulation fan cover of the sintering machine B (201) through a fourth flue gas conveying pipeline (L4); a main exhaust fan B (203) is arranged on the second flue gas conveying pipeline (L2);
wherein: the first flue gas conveying pipeline (L1) is divided into two branches, wherein the first branch (L1 a) is connected into a flue gas circulation fan housing of the sintering machine A (101), and the second branch (L1B) is connected into a flue gas circulation fan housing of the sintering machine B (201); a circulating fan A1 (105) is arranged on the first branch (L1 a), and a circulating fan B1 (205) is arranged on the second branch (L1B).
17. The integrated circulation treatment device for flue gas of a double-series sintering system according to claim 16, wherein: the device also comprises a flue gas mixer A (106), the tail end of the first branch (L1 a) is connected to the flue gas mixer A (106), the tail end of the third flue gas conveying pipeline (L3) is connected to the flue gas mixer A (106), and a gas outlet of the flue gas mixer A (106) is connected into a flue gas circulation fan housing of the sintering machine A (101); and/or
The device also comprises a flue gas mixer B (206), the tail end of the second branch (L1B) is connected to the flue gas mixer B (206), the tail end of the fourth flue gas conveying pipeline (L4) is connected to the flue gas mixer B (206), and a gas outlet of the flue gas mixer B (206) is connected into a flue gas circulation fan housing of the sintering machine B (201).
18. The integrated circulation treatment device for flue gas of a double-series sintering system according to claim 17, wherein: a circulating fan A2 (107) is arranged on the third flue gas conveying pipeline (L3); and/or
And a circulating fan B2 (107) is arranged on the fourth flue gas conveying pipeline (L4).
19. The double-series sintering system flue gas comprehensive circulation treatment device according to any one of claims 16 to 18, wherein: a dust remover A (108) is arranged on the first flue gas conveying pipeline (L1); and/or
A dust remover B (208) is arranged on the second flue gas conveying pipeline (L2).
20. The integrated circulation treatment device for flue gas of a double-series sintering system according to claim 19, wherein: the dust remover A (108) is arranged at the upstream of the main exhaust fan A (103); and/or
The dust separator B (208) is disposed upstream of the main blower B (203).
21. The integrated circulation treatment device for flue gas of a double-series sintering system according to claim 20, wherein: the dust remover A (108) is an electric dust remover; and/or
The dust collector B (208) is an electric dust collector.
22. The integrated circulation treatment device for flue gas of a double-series sintering system according to claim 19, wherein: an ammonia gas injection device A (109) is arranged in a flue gas circulation fan cover of the sintering machine A (101) or in a flue gas mixer A (106); and/or
An ammonia gas injection device B (209) is arranged in a flue gas circulation fan cover of the sintering machine B (201) or in a flue gas mixer B (206).
23. The integrated circulation treatment device for flue gas of a double-series sintering system according to claim 20 or 21, wherein: an ammonia gas injection device A (109) is arranged in a flue gas circulation fan cover of the sintering machine A (101) or in a flue gas mixer A (106); and/or
An ammonia gas injection device B (209) is arranged in a flue gas circulation fan cover of the sintering machine B (201) or in a flue gas mixer B (206).
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