CN109813129A - One kind being based on circulation of tail gas O2-CO2Combustion-supporting pelletizing production technique and preparation system - Google Patents
One kind being based on circulation of tail gas O2-CO2Combustion-supporting pelletizing production technique and preparation system Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/32—Direct CO2 mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
It is of the invention a kind of based on circulation of tail gas O2‑CO2Combustion-supporting pelletizing production technique and preparation system belong to Ferrous Metallurgy process pelletizing green high-efficient and prepare production field, the physical thermal of tail gas in production process is used for the drying and preheating of pelletizing, will contain high concentration CO2The tail gas of gas is directly or through the combustion-supporting gas mixed with industrial pure oxygen after purification as fuel.The invention takes full advantage of the waste heat of tail gas, improves the heating efficiency of pelletizing preparation system；Nearly zero input for realizing pelletizing preparation system nitrogen, from reducing NO in production process on sourcexGeneration；Contain high concentration CO2The tail gas of gas can low cost prepare technical grade/food-class CO2Gas provides a kind of CO2Recycling and emission reduction approach.
Description
Technical field
The invention belongs to Ferrous Metallurgy process pelletizing green high-efficients to prepare production field, and in particular to one kind is followed based on tail gas
Ring O2-CO2Combustion-supporting pelletizing production technique and preparation system.
Background technique
Chemically reacting during blast furnace ironmaking most of is carried out between gas phase and solid-state furnace charge, and this requires in furnace
Filled layer have good gas permeability, furnace charge have certain particle size and uniformly；With the extensive development of steel and iron industry, taste compared with
High, the suitable iron ore yield of granularity drastically reduces, and after largely developing and using poor iron ore deposit, it is provided by ore-dressing technique
A large amount of fine grinding Iron concentrates for being less than 0.074mm, this raw material are used for the production not only serious waste energy, but also technique of sinter
Technical difficulty, product quality are poor.
In the 1920s, Sweden proposes pelletizing process, the characteristic which can be big passes through
Adsorbed film of water is formed in fine iron breeze particle surface with addition of part water, is bonded to one another between particle, then by rolling molding mode
The pelletizing that diameter is 9-16mm is formed, there is very high mechanical strength after high-temperature roasting, not only meet wanting for blast furnace process
It asks, and can be subjected to transporting for long-distance and store without broken.
The main technique for preparing pelletizing at present has belt type roasting machine technique, grate kiln technique and shaft furnace process,
China's grate-kiln pelletizing production line production capacity has reached hundred million tons of 1.5-1.6 at present, and account for about China's pellet production capacity 70% is left
The right side, the technique are mainly characterized by for the equipment of three kinds of different function being cascaded, and the drying of pelletizing is completed on drying grate
And preheating is cooled down, equipment is simple and reliable, and every equipment can be independent in revolution roasting in kilns hardening consolidation in ring cold machine
Control, flexible modulation is strong to raw material and fuel tolerance, uniform in quality.
But since China's pelletizing industry start-up time is later, development time is shorter, drying grate-rotary kiln-circular cooler pelletizing
There is also some problems for production technology, larger with external advanced enterprises gap in terms of energy-saving and emission-reduction, such as revolution at present
Coke oven/blast furnace gas or coal dust are often used in kiln as fuel, air progress is combustion-supporting, provides required for the roasting of pelletizing drying and preheating
Heat, but since there are a large amount of N in furnace atmosphere2, the high temperature on flame combustion sharp side leads to NO in exhaust gasxConcentration over-standard is simultaneously big
Amount discharge, in general NO in the technical process tail gasxConcentration is 100mg/m3More than, and if using pure oxygen as combustion adjuvant,
Then will lead to flame combustion sharp side temperature is more than 2500 DEG C or more, seriously affects the rotary kiln furnace wall resistance to material service life；Secondly in equipment
Fuel and power consumption are higher in operational process, CO2Discharge amount is big, according to statistics pelletizing preparation process CO2Discharge amount accounts for about steel work
The 11.5% of industry discharge amount is primarily due to a large amount of heat of the nitrogen adsorption in air, and in tail gas entrained by nitrogen
Physics efficiency of heating- utilization is lower.
Therefore existing drying grate-rotary kiln-circular cooler pelletizing production equipment and technique how are improved, made full use of more than tail gas
Heat reduces NO in production processxAnd CO2Emission reduction, for realizing that the development of steel industry high quality is significant with transition and upgrade.
Summary of the invention
To solve the above problems, the present invention proposes one kind based on circulation of tail gas O2-CO2Combustion-supporting pelletizing production technique and system
The physical thermal of tail gas in production process, is used for the drying and preheating of pelletizing, will contain high concentration CO by standby system2The tail gas of gas is straight
As the combustion-supporting gas of fuel after connecing or mixing after purification with industrial pure oxygen, nearly the zero of whole system nitrogen is realized
Input, from reducing NO in production process on sourcexGeneration；Tail gas obtains the CO of high concentration after recycling2Gas,
By simple fume treatment and CO2After purifying can low cost prepare technical grade/food-class CO2Gas is advantageously implemented
CO2Recycling and emission reduction.
The present invention is achieved by the following technical solutions:
One kind being based on circulation of tail gas O2-CO2Combustion-supporting pelletizing production technique, which is characterized in that use grate kiln-
Main equipment of the ring cold machine as pelletizing production uses the lower industrial gas of nitrogen content or coal dust as the combustion of rotary kiln
Material, combustion adjuvant is by cold I section of industrial pure oxygen and ring cold machine ring and the cold II section of tail gas of ring or drying grate dryer section tail gas after purification
Obtained high concentration CO2Gas is mixed in a certain ratio to obtain；
The high temperature rotating kiln exhaust gas that rotary kiln fuel burning generates is used for the pelletizing warm of drying grate preheating section, is changed
The drying grate preheating section tail gas that low temperature is generated after heat is recycled to cold I section and cold II section of ring of ring cold machine ring after being dehydrated dedusting, with
Finished product hot-bulb nodulizing exchanges heat again, realizes that the pressure of pelletizing is cooling and absorbs the heat of finished ball nodulizing, later ring cold machine ring cold I
Section and the cold II section of circulation of tail gas of ring contain high concentration CO for the drying of pelletizing in drying grate to drying grate dryer section2Chain comb
Machine dryer section tail gas is directed into CO after dedusting is dehydrated desulfurization and the denitration of underload2In thick purifying plant, it is used to prepare height
Concentration C O2Gas, part high concentration CO2Gas is delivered to CO2Cryogenic liquefying purifying plant, for producing technical grade/food-grade
CO2Gas.
Further, described to be based on circulation of tail gas O2-CO2The specific production process of combustion-supporting pelletizing production technique include with
Lower step:
Step 1: the rotary kiln exhaust gas that rotary kiln generates being led to the preheating section of drying grate, for preheating the ball in drying grate
Nodulizing；
Step 2: the rotary kiln exhaust gas after heat exchange is led in tail gas after circulation section dedusting de-watering apparatus through booster fan, is imported
To cold I section and cold II section of ring of ring cold machine ring, for forcing cooling finished product pellet；
Step 3: in cold I section of ring cold machine ring and ring cold II section of outlet conduit P10, gas componant detection device I, analysis are set
CO in cold I section of ring cold machine ring and the cold II section of tail gas of ring2Concentration；
Step 3a: if N in cold I section of ring cold machine ring and the cold II section of tail gas of ring2Concentration is less than 5%, and reversal valve II acts, by one
Cold I section of part ring cold machine ring and the cold II section of tail gas of ring are directed into oxidant matching system, carry out by a certain percentage with industrial pure oxygen
Mix the combustion adjuvant to burn as rotary kiln fuel；Cold I section of remaining ring cold machine ring and the cold II section of tail gas of ring add through booster fan
Drying grate dryer section is imported after pressure, for drying pellet；
Step 3b: if N in cold I section of ring cold machine ring and the cold II section of tail gas of ring2Concentration is higher than 5%, and reversal valve II acts, will be complete
Cold I section of portion's ring cold machine ring and the cold II section of tail gas of ring are directed into drying grate dryer section after booster fan pressurizes, for drying pelletizing
Mine；Reversal valve III acts, by high concentration CO2Gas gas storage holder middle and high concentration CO2Gas is directed into oxidant matching system, and ties up
Hold cold I section of the ring cold machine ring and the cold II section of tail gas (b) of ring measured after the state 3min, 3min according to gas componant detection device I
Middle CO2Concentration selects step 3a or 3b；
Step 4: drying grate dryer section tail gas (c) imports tail gas outer circulation section dedusting water removal desulfurization after booster fan pressurizes
Denitrification apparatus, and gas componant detection device II is set in equipment export；
Step 4a: if CO in drying grate dryer section tail gas (c)2Gas concentration is directly discharged through reversal valve lower than 75%；
Step 4b: if CO in drying grate dryer section tail gas (c)2Gas concentration is higher than 75%, then is introduced into CO2Slightly mention
Pure device, obtains CO2Gas concentration is greater than 98% high concentration CO2Gas (d), and store to high concentration CO2Gas gas storage holder；
Step 5: high concentration CO2Gas (d) a part is for N in cold I section of ring cold machine ring and the cold II section of tail gas (b) of ring2Concentration
In the case of 5%, carry out mixing the combustion adjuvant as rotary kiln fuel burning by a certain percentage with industrial pure oxygen；Rest part
Then it is sent into CO2Cryogenic liquefying purifying plant, for producing technical grade/food-class CO2Gas (e).
Further, the rotary kiln firing up mode is outsourcing technical grade CO2Gas (f) is directed into commodity CO2
Gas storage holder is simultaneously delivered to oxidant matching system, helping as rotary kiln fuel burning after being mixed in a certain ratio with industrial pure oxygen
Fire agent, when kiln bore temperature be higher than 1250 DEG C, pelletizing preparation system operation mode is switched to normal production model.
One kind being based on circulation of tail gas O2-CO2Combustion-supporting pelletizing preparation system, comprising: drying grate dryer section, drying grate preheating
Section, rotary kiln, cold I section of ring cold machine ring, cold II section of ring cold machine ring, cold III section of ring cold machine ring, oxidant matching system, coal dust concentrated phase
Conveying device, reversal valve I, oxidant nozzle, fuel nozzle, circulation section dedusting de-watering apparatus in tail gas, gas componant detection dress
Set I, reversal valve II, reversal valve III, tail gas outer circulation section dedusting removes water desulfuring and denitrifying apparatus, and gas componant detection device II is changed
To valve IV, CO2Thick purifying plant, high concentration CO2Gas gas storage holder, reversal valve V, CO2Cryogenic liquefying purifying plant, commodity CO2
Gas storage holder, outsourcing CO2Gas source, booster fan.
Further, industrial oxygen accesses oxidant matching system by pipeline P1, and II gas vent of reversal valve passes through pipeline
P2 is connect with oxidant matching system, and oxidant matching system gas vent is connect by pipeline P3 with oxidant nozzle, coal dust
Transport device for dense phase is connect by pipeline P4 with reversal valve I, and gaseous fuel is connect by pipeline P5 with reversal valve I, and reversal valve I goes out
Mouth is connect by pipeline P6 with fuel nozzle, and drying grate preheating pars infrasegmentalis exhaust outlet is connect by pipeline P7 with booster fan, is increased
Pressure fan is connect by pipeline P8 with circulation section dedusting de-watering apparatus in tail gas, and circulation section dedusting de-watering apparatus passes through pipe in tail gas
Road P9 and ring cold machine ring are I section cold, the cold II pars infrasegmentalis exhaust outlet of ring cold machine ring is connect, and ring cold machine ring is I section cold, cold II section of ring cold machine ring
Top exhaust outlet is connect by pipeline P10 with II entrance of reversal valve, and exhaust gas component detection device I passes through pipeline P11 and pipeline P10
Connection, the outlet of reversal valve II 1 are connect by pipeline P12 with booster fan entrance, and booster fan outlet passes through pipeline P13 and changes
It is connected to III 1 entrance of valve, another outlet of reversal valve II is connect by pipeline P14 with booster fan entrance, and booster fan outlet is logical
Piping P15 is connect with drying grate dryer section top air inlet, and the dry pars infrasegmentalis exhaust outlet of drying grate passes through pipeline P16 and pressurization
Air inlet connection, booster fan exhaust outlet by pipeline P17 and tail gas outer circulation section dedusting remove water desulfuring and denitrifying apparatus into
Air port connection, tail gas outer circulation section dedusting remove water desulfuring and denitrifying apparatus exhaust outlet and are connected by pipeline P18 and IV 1 entrance of reversal valve
It connects, exhaust gas component detection device II is connect by pipeline P19 with pipeline P18, and the outlet of reversal valve IV 1 passes through pipeline P20 and release
Mouth connection, another outlet of reversal valve IV pass through pipeline P21 and CO2Thick purifying plant entrance connection, CO2Thick purifying plant outlet is logical
Piping P22 and high concentration CO2The connection of gas gas storage holder, high concentration CO2The outlet of gas gas storage holder passes through P23 and reversal valve V 1
Entrance connection, the outlet of reversal valve V 1 are connect by pipeline P24 with booster fan entrance, and booster fan outlet passes through pipeline P25
It is connect with III 1 entrance of reversal valve, the outlet of reversal valve V 1 passes through pipeline P26 and CO2The connection of cryogenic liquefying purifying plant entrance,
CO2The outlet of cryogenic liquefying purifying plant passes through pipeline P27 and commodity CO2The connection of gas storage holder entrance, outsourcing CO2Gas source passes through pipeline
P28 and commodity CO2Another entrance connection of gas storage holder, commodity CO2The outlet of gas storage holder one passes through pipeline P29 and III 1 entrance of reversal valve
Connection, commodity CO2The outlet of gas storage holder one is connect by pipeline P30 with coal dust transport device for dense phase carrier gas inlet, commodity CO2Gas storage
The outlet of cabinet one passes through pipeline P31 and conveying outlet connection.
Further, the preparation system further includes feed inlet atmosphere protection device and ring cold machine fuselage atmosphere protection dress
It sets, the feed inlet atmosphere protection device is installed on the drying grate Handpiece Location, the ring cold machine fuselage atmosphere protection device
Be installed on ring cold machine ring it is cold II section and ring it is cold between III section, cold I section of ring cold machine ring and the cold II section of tail gas of ring are directed into the ring
Cold fuselage atmosphere protection device is blown flow according to atmosphere protection device local environment pressure-regulated gas, guarantees the position
Gas pressure be higher than environmental pressure, prevent air enter drying grate, rotary kiln, ring cold machine ring it is I section cold, II section of He Huanleng, revolution
Kiln firing up mode, commodity in use CO2The technical grade CO of outsourcing in gas storage holder2Gas is as protective gas, normal production model
Use CO2Thick purifying plant middle and high concentration CO2Gas is as protective gas.
Further, fuel used in the rotary kiln can be coal dust, coke-stove gas and natural gas, or pass through nitrogen
Qi exhaustion removes rear blast furnace gas of the nitrogen volume less than 1%, coal gas of converter or coke-stove gas；The carrier gas of coal dust uses the commodity
CO2CO in gas storage holder (20)2Gas (f), oxygen concentration >=99.5vol% in industrial pure oxygen.
Further, it uses normal temperature air as the cooling gas of finished ball nodulizing for cold III section of the ring, further strengthens
The cooling of finished ball nodulizing meets the requirement of the storage of finished ball nodulizing and transport.
The beneficial effect comprise that
(1) using ring cold machine tail gas or drying grate tail gas through CO2High concentration CO after purification2Gas is mixed with industrial pure oxygen
As combustion adjuvant, combustion adjuvant is used air as instead of original technique, farthest reduces nitrogen in pelletizing production system
Input quantity, the generation of nitrogen oxides is reduced from source；
(2) tail gas of high temperature is used for the drying and preheating of drying grate pelletizing, pelletizing production system is farthest utilized
Waste heat in system；
(3) nitrogen amount largely reduces in drying grate-rotary kiln-circular cooler pelletizing production system, accordingly reduces nitrogen liter
The heat that temperature is absorbed, and effectively improve the heating efficiency of whole system；
(4) it ultimately generates in drying grate-rotary kiln-circular cooler pelletizing production system containing higher concentration CO2The tail of gas
Gas can pass through simple vent gas treatment and CO2Purifying produces technical grade/food-class CO at low cost2Gas is conducive to
CO2The recycling and emission reduction of gas.
Detailed description of the invention
Fig. 1, which is that the present invention is a kind of, is based on circulation of tail gas O2-CO2The system of combustion-supporting pelletizing production technique and preparation system is shown
It is intended to.
In figure: drying grate dryer section (1-1), drying grate preheating section (1-2), rotary kiln (2), the cold I section of (3- of ring cold machine ring
1), ring cold machine ring is cold II section (3-2), and ring cold machine ring is cold III section (3-3), oxidant matching system (4), coal dust transport device for dense phase
(5), reversal valve I (6), oxidant nozzle (7), fuel nozzle (8), circulation section dedusting de-watering apparatus (9) in tail gas, gas componant
Detection device I (10), reversal valve II (11), reversal valve III (12), tail gas outer circulation section dedusting remove water desulfuring and denitrifying apparatus (13),
Gas componant detection device II (14), reversal valve IV (15), CO2Thick purifying plant (16), high concentration CO2Gas gas storage holder (17),
Reversal valve V (18), CO2Cryogenic liquefying purifying plant (19), commodity CO2Gas storage holder (20), outsourcing CO2Gas source (21) is pressurized wind
Machine (22), feed inlet atmosphere protection device (23), ring cold machine fuselage atmosphere protection device (24).
Each gas number in system are as follows: rotary kiln exhaust gas (a), cold I section of ring cold machine ring and the cold II section of tail gas (b) of ring, chain are combed
Machine dryer section (1-1) tail gas (c), high concentration CO2Gas (d), technical grade/food-class CO2Gas (e).
Specific embodiment
In the present embodiment, the system and method is applied to produce grate kiln-ring of 800,000 tons of iron ore pellets per year
In cold process units.
It is described a kind of based on circulation of tail gas O2-CO2Combustion-supporting pelletizing preparation system includes: drying grate dryer section (1-1), chain
Comb machine preheating section (1-2), rotary kiln (2), ring cold machine ring is cold I section (3-1), and ring cold machine ring is cold II section (3-2), ring cold machine ring cold III
Section (3-3), oxidant matching system (4), coal dust transport device for dense phase (5), reversal valve I (6), oxidant nozzle (7), fuel spray
Mouth (8), circulation section dedusting de-watering apparatus (9) in tail gas, gas componant detection device I (10), reversal valve II (11), reversal valve III
(12), tail gas outer circulation section dedusting water removal desulfuring and denitrifying apparatus (13), gas componant detection device II (14), reversal valve IV
(15), CO2Thick purifying plant (16), high concentration CO2Gas gas storage holder (17), reversal valve V (18), CO2Cryogenic liquefying purification dress
It sets (19), commodity CO2Gas storage holder (20), outsourcing CO2Gas source (21), booster fan (22) feed inlet atmosphere protection device (23), ring
Cold fuselage atmosphere protection device (24).
It is described a kind of based on circulation of tail gas O2-CO2Combustion-supporting pelletizing preparation system, each equipment room connection type are as follows: industry
Oxygen accesses oxidant matching system (4) by pipeline P1, and reversal valve II (12) gas vent is matched by pipeline P2 and oxidant
System (4) connection, oxidant matching system (4) gas vent are connect by pipeline P3 with oxidant nozzle (7), and coal dust concentrated phase is defeated
Device (5) are sent to connect by pipeline P4 with reversal valve I (6), gaseous fuel is connect by pipeline P5 with reversal valve I (6), reversal valve
I (6) outlet is connect by pipeline P6 with fuel nozzle (8), and drying grate preheating section (1-2) lower part exhaust outlet is by pipeline P7 and increases
Pressure fan (22-1) connection, booster fan (22-1) are connect by pipeline P8 with circulation section dedusting de-watering apparatus (9) in tail gas, tail
Circulation section dedusting de-watering apparatus (9) passes through under pipeline P9 and ring cold machine ring cold I section (3-1), ring cold machine ring cold II section (3-2) in gas
The connection of portion's exhaust outlet, cold II section of (3-2) the top exhaust outlet of ring cold machine ring cold I section (3-1), ring cold machine ring pass through pipeline P10 and change
It is connected to valve II (11) entrance, exhaust gas component detection device I (10) is connect by pipeline P11 with pipeline P10, reversal valve II (11)
One outlet is connect by pipeline P12 with booster fan (22-2) entrance, and booster fan (22-2) outlet passes through pipeline P13 and commutation
The connection of valve III (12) entrance, another outlet of reversal valve II (11) are connect with booster fan (22-3) entrance by pipeline P14, are increased
Pressure fan (22-3) outlet is connect by pipeline P15 with the top drying grate dryer section (1-1) air inlet, drying grate dryer section (1-
1) lower part exhaust outlet is connect by pipeline P16 with booster fan (22-4) air inlet, and booster fan (22-4) exhaust outlet passes through pipe
Road P17 is connect with tail gas outer circulation section dedusting water removal desulfuring and denitrifying apparatus (13) air inlet, and tail gas outer circulation section dedusting water removal is de-
Sulphur denitrification apparatus (13) exhaust outlet is connect by pipeline P18 with reversal valve IV (15) entrance, exhaust gas component detection device II
(14) it is connect by pipeline P19 with pipeline P18, the outlet of reversal valve IV (15) one is connect by pipeline P20 with diffusion mouth, reversal valve
Another outlet in IV (15) passes through pipeline P21 and CO2Thick purifying plant (16) entrance connection, CO2Thick purifying plant (16) outlet passes through
Pipeline P22 and high concentration CO2Gas gas storage holder (17) connection, high concentration CO2Gas gas storage holder (17) outlet passes through P23 and commutation
The connection of valve V (18) entrance, the outlet of reversal valve V (18) one are connect with booster fan (22-5) entrance by pipeline P24, are pressurized
Blower (22-5) outlet is connect by pipeline P25 with reversal valve III (12) entrance, and the outlet of reversal valve V (18) one passes through pipeline
P26 and CO2The connection of cryogenic liquefying purifying plant (19) entrance, CO2Cryogenic liquefying purifying plant (19) outlet by pipeline P27 with
Commodity CO2The connection of gas storage holder (20) entrance, outsourcing CO2Gas source (21) passes through pipeline P28 and commodity CO2Gas storage holder (20) it is another enter
Mouth connection, commodity CO2The outlet of gas storage holder (20) one is connect by pipeline P29 with reversal valve III (12) entrance, commodity CO2Gas storage
The outlet of cabinet (20) one is connect by pipeline P30 with coal dust transport device for dense phase (5) carrier gas inlet, commodity CO2Gas storage holder (20) one
Outlet passes through pipeline P31 and conveying outlet connection.
It is described a kind of based on circulation of tail gas O2-CO2Combustion-supporting pelletizing preparation system includes feed inlet atmosphere protection device (23)
With ring cold machine fuselage atmosphere protection device (24), the feed inlet atmosphere protection device (23) is installed on drying grate head position
Set, the ring cold machine fuselage atmosphere protection device (24) be installed on cold II section of III section of (3-2) He Huanleng (3-3) of ring cold machine ring it
Between, cold I section of (3-1) He Huanleng, II section of (3-2) tail gas (b) of ring cold machine ring is directed into the ring cold machine fuselage atmosphere protection device
(24), flow is blown according to atmosphere protection device local environment pressure-regulated gas, guarantees that the position gas pressure is higher than environment
Pressure prevents air from entering cold I section of II section of (3-1) He Huanleng (3-2) of drying grate (1)-rotary kiln (2)-ring cold machine ring.
It is described a kind of based on circulation of tail gas O2-CO2Combustion-supporting pelletizing production technique the following steps are included:
System runs 0min, into rotary kiln firing up mode: outsourcing part technical grade CO2Gas is stored in commodity
CO2Gas storage holder (20), and oxidant matching system (4) are delivered to, it is matched with industrial pure oxygen, mixed proportion (volume ratio) is
CO2:O2=4:1, CO2Flow is 24800Nm3/ h, O2Flow is 6200Nm3/ h, rotary kiln fuel are natural gas, and flow is
2000Nm3/ h, rotary kiln exhaust gas (a) ingredient after burning: 86.45vol%CO2, 12.90vol%H2O, 0.6452vol%O2, stream
Amount is 31000Nm3/ h, temperature are 600 DEG C, drying grate preheating section (1-2) are led to, for preheating the pellet in drying grate；
Rotary kiln exhaust gas (a) temperature after heat exchange is 100 DEG C, leads to circulation section dedusting in tail gas through booster fan (22-1)
De-watering apparatus (9), after processing gas componant are as follows: 99.26%CO2, 0.7407%O2, and cold I section is conducted into ring cold machine ring
II section of (3-1) He Huanleng (3-2), for forcing cooling finished product pellet, cold I section of (3-1) He Huanleng of ring cold machine ring after exchanging heat
II section of (3-2) tail gas (b) temperature is 400 DEG C；
Cold I section of part ring cold machine ring and the cold II section of tail gas (b) of ring are directed into oxidant matching system (4), flow is
24800Nm3/ h carries out mixing the combustion adjuvant as rotary kiln fuel burning with industrial pure oxygen by a certain percentage；Remaining ring is cold
Cold I section of machine ring and the cold II section of tail gas (b) of ring import drying grate dryer section (1-1) after booster fan (22-3) pressurization, for doing
Dry pellet；Drying grate dryer section (1-1) tail gas (c) temperature is 40 DEG C after heat exchange, is imported after booster fan (22-4) pressurization
Tail gas outer circulation section dedusting remove water desulfuring and denitrifying apparatus (13), after be introduced into CO2Thick purifying plant (16), obtains CO2Gas
Concentration is greater than 98% high concentration CO2Gas (d), and store to high concentration CO2Gas gas storage holder (17), is wanted according to production plan
It asks part high concentration CO2Gas is sent into CO2Cryogenic liquefying purifying plant (19), for producing technical grade/food-class CO2Gas
(e)；
System runs 30min, and kiln bore temperature is increased to 1250 DEG C, switches to normal production model, rotary kiln
Fuel is coal dust, and carbon content 80.3wt%, hydrogen content 3.5wt%, blowing flow is 3.2t/h, commodity in use CO2Gas storage
Technical grade/food-class CO in cabinet (20)2Gas (e) is used as coal dust carrier gas, carrier gas flux 200Nm3/h；By part ring cold machine ring
Cold I section is directed into oxidant matching system (4), flow 25000Nm with the cold II section of tail gas (b) of ring3/ h, industrial oxygen flow are
6500Nm3/ h, rotary kiln exhaust gas (a) ingredient after burning: 94.39vol%CO2, 4.01vol%H2O, 1.6vol%N2, flow is
31251Nm3/ h, temperature are 750 DEG C, drying grate preheating section (1-2) are led to, for preheating the pellet in drying grate；
Rotary kiln exhaust gas (a) temperature after heat exchange is 120 DEG C, leads to circulation section dedusting in tail gas through booster fan (22-1)
De-watering apparatus (9), after processing gas componant are as follows: 98.33%CO2, 1.67%N2, and cold I section is conducted into ring cold machine ring
II section of (3-1) He Huanleng (3-2), for forcing cooling finished product pellet, cold I section of (3-1) He Huanleng of ring cold machine ring after exchanging heat
II section of (3-2) tail gas (b) temperature is 400 DEG C；
Cold I section of part ring cold machine ring and the cold II section of tail gas (b) of ring are directed into oxidant matching system (4), with technical pure
Oxygen carries out the combustion adjuvant that mixing is burnt as rotary kiln fuel by a certain percentage；Cold I section and cold II section of ring of remaining ring cold machine ring
Tail gas (b) imports drying grate dryer section (1-1) after booster fan (22-3) pressurization, for drying pellet；Chain is combed after heat exchange
Machine dryer section (1-1) tail gas (c) temperature is 40 DEG C, and tail gas outer circulation section dedusting water removal is imported after booster fan (22-4) pressurization
Desulfuring and denitrifying apparatus (13), after be introduced into CO2Thick purifying plant (16), obtains CO2Gas concentration is greater than 98% high concentration
CO2Gas (d), and store to high concentration CO2Gas gas storage holder (17) is required according to production plan by part high concentration CO2Gas
It is sent into CO2Cryogenic liquefying purifying plant (19), for producing technical grade/food-class CO2Gas (e)；
System runs 50min, and nitrogen content is in cold II section of (3-2) tail gas of cold I section of (3-1) the ring cold machine ring of ring cold machine ring
5.13%, reversal valve III (12) movement uses high concentration CO2Gas gas storage holder (17) middle and high concentration CO2Gas as combustion adjuvant,
It is directed into oxidant matching system (4), flow 25000Nm3/ h, reversal valve II (11) movement, cold I section of whole ring cold machine rings and
The cold II section of tail gas (b) of ring imports drying grate dryer section (1-1) after booster fan (22-3) pressurization, for drying pellet.
System runs 53min, N in cold I section of ring cold machine ring and the cold II section of tail gas (b) of ring2Concentration is 1.5vol%, commutation
Cold I section of part ring cold machine ring and the cold II section of tail gas (b) of ring are directed into oxidant matching system (4), flow by valve II (11) movement
For 24800Nm3/ h, other systems operating parameter are constant.
System totality NOxConcentration of emission is less than 10mg/Nm3, year can about 8000 tons of CO of emission reduction2。
Claims (7)
1. one kind is based on circulation of tail gas O2-CO2Combustion-supporting pelletizing production technique, which is characterized in that use grate kiln-ring
Main equipment of the cold as pelletizing production uses the lower industrial gas of nitrogen content or coal dust as the combustion of rotary kiln (2)
Material, combustion adjuvant is by industrial pure oxygen and ring cold machine ring II section of (3-2) tail gas (b) of cold I section of (3-1) He Huanleng or drying grate dryer section
The high concentration CO that (1-1) tail gas obtains after purification2Gas is mixed in a certain ratio to obtain；
Pelletizing of the high temperature rotating kiln exhaust gas (a) that rotary kiln (2) fuel combustion is generated for drying grate preheating section (1-2) preheats
Process generates drying grate preheating section (1-2) tail gas (b) of low temperature, ring cold machine ring cold I is recycled to after being dehydrated dedusting after heat exchange
II section of (3-1) He Huanleng of section (3-2), exchanges heat again with finished product hot-bulb nodulizing, realizes that the pressure of pelletizing is cooling and absorbs finished ball
The heat of nodulizing, cold I section of ring cold machine ring and the cold II section of tail gas (b) of ring are recycled to drying grate dryer section (1-1) later, comb for chain
The drying of pelletizing, contains high concentration CO in machine (1)2Drying grate dryer section (1-1) tail gas (c) by dedusting dehydration desulfurization and low
After the denitration of load, it is directed into CO2In thick purifying plant (16), it is used to prepare high concentration CO2Gas (d), part high concentration CO2
Gas (d) is delivered to CO2Cryogenic liquefying purifying plant (19), for producing technical grade/food-class CO2Gas (e).
2. a kind of according to claim 1 be based on circulation of tail gas O2-CO2Combustion-supporting pelletizing production technique, which is characterized in that tool
Body production process the following steps are included:
Step 1: the rotary kiln exhaust gas (a) that rotary kiln (2) generate being led to the preheating section (1-2) of drying grate, is combed for preheating chain
Pellet in machine；
Step 2: the rotary kiln exhaust gas (a) after heat exchange leads to circulation section dedusting de-watering apparatus in tail gas through booster fan (22-1)
(9) after, it is directed into cold I section of II section of (3-1) He Huanleng (3-2) of ring cold machine ring, for forcing cooling finished product pellet；
Step 3: in II section of (3-2) outlet conduit P10 of cold I section of (3-1) He Huanleng of ring cold machine ring, gas componant detection device I is set
(10), CO in cold I section of ring cold machine ring and the cold II section of tail gas (b) of ring is analyzed2Concentration；
Step 3a: if N in cold I section of ring cold machine ring and the cold II section of tail gas (b) of ring2Concentration is less than 5%, and reversal valve II (11) movement will
Cold I section of a part of ring cold machine ring and the cold II section of tail gas (b) of ring are directed into oxidant matching system (4), with industrial pure oxygen by certain
Ratio carries out the combustion adjuvant that mixing is burnt as rotary kiln fuel；Cold I section of remaining ring cold machine ring and cold II section of tail gas (b) warp of ring
Drying grate dryer section (1-1) is imported after booster fan (22-3) pressurization, for drying pellet；
Step 3b: if N in cold I section of ring cold machine ring and the cold II section of tail gas (b) of ring2Concentration is higher than 5%, and reversal valve II (11) movement will
Cold I section of whole ring cold machine rings and the cold II section of tail gas (b) of ring are directed into drying grate dryer section (1- after booster fan (22-3) pressurization
1), for drying pellet；Reversal valve III (12) movement, by high concentration CO2Gas gas storage holder (17) middle and high concentration CO2Gas (d)
Oxidant matching system (4) are directed into, and are measured after maintaining the state 3min, 3min according to gas componant detection device I (10)
Cold I section of ring cold machine ring and the cold II section of tail gas (b) of ring in CO2Concentration selects step 3a or 3b；
Step 4: drying grate dryer section (1-1) tail gas (c) imports tail gas outer circulation section dedusting after booster fan (22-4) pressurization
It removes water desulfuring and denitrifying apparatus (13), and gas componant detection device II (14) is set in equipment export；
Step 4a: if CO in drying grate dryer section (1-1) tail gas (c)2Gas concentration is directly arranged through reversal valve (15) lower than 75%
It puts；
Step 4b: if CO in drying grate dryer section (1-1) tail gas (c)2Gas concentration is higher than 75%, then is introduced into CO2Slightly mention
Pure device (16), obtains CO2Gas concentration is greater than 98% high concentration CO2Gas (d), and store to high concentration CO2Gas gas storage
Cabinet (17)；
Step 5: high concentration CO2Gas (d) a part is for N in cold I section of ring cold machine ring and the cold II section of tail gas (b) of ring2Concentration is greater than
In the case of 5%, carry out mixing the combustion adjuvant as rotary kiln (2) fuel combustion by a certain percentage with industrial pure oxygen；Rest part
Then it is sent into CO2Cryogenic liquefying purifying plant (19), for producing technical grade/food-class CO2Gas (e).
3. according to claim 1 a kind of based on circulation of tail gas O2-CO2Combustion-supporting pelletizing preparation process, it is characterised in that:
Rotary kiln firing up mode are as follows: outsourcing technical grade CO2Gas (f) is directed into commodity CO2Gas storage holder (20) is simultaneously delivered to oxidant
Matching system (4), the combustion adjuvant after being mixed in a certain ratio with industrial pure oxygen as rotary kiln fuel burning, when rotary kiln burner hearth
Temperature is higher than 1250 DEG C, and pelletizing preparation system operation mode is switched to normal production model.
4. one kind is based on circulation of tail gas O2-CO2Combustion-supporting pelletizing preparation system, it is characterised in that: system includes: that drying grate is dry
Section (1-1), drying grate preheating section (1-2), rotary kiln (2), ring cold machine ring is cold I section (3-1), and ring cold machine ring is cold II section (3-2), ring
Cold ring is cold III section (3-3), oxidant matching system (4), coal dust transport device for dense phase (5), reversal valve I (6), oxidant nozzle
(7), fuel nozzle (8), circulation section dedusting de-watering apparatus (9) in tail gas, gas componant detection device I (10), reversal valve II
(11), reversal valve III (12), tail gas outer circulation section dedusting remove water desulfuring and denitrifying apparatus (13), gas componant detection device II
(14), reversal valve IV (15), CO2Thick purifying plant (16), high concentration CO2Gas gas storage holder (17), reversal valve V (18), CO2It is deep
Cold liquefaction purifying plant (19), commodity CO2Gas storage holder (20), outsourcing CO2Gas source (21), booster fan (22)；
Industrial oxygen accesses oxidant matching system (4) by pipeline P1, and reversal valve II (12) gas vent passes through pipeline P2 and oxygen
Agent matching system (4) connection, oxidant matching system (4) gas vent are connect by pipeline P3 with oxidant nozzle (7), coal
Powder transport device for dense phase (5) is connect by pipeline P4 with reversal valve I (6), and gaseous fuel is connected by pipeline P5 and reversal valve I (6)
It connects, reversal valve I (6) outlet is connect by pipeline P6 with fuel nozzle (8), and the lower part drying grate preheating section (1-2) exhaust outlet passes through
Pipeline P7 is connect with booster fan (22-1), and booster fan (22-1) passes through circulation section dedusting de-watering apparatus in pipeline P8 and tail gas
(9) it connects, circulation section dedusting de-watering apparatus (9) is cold by pipeline P9 and ring cold machine ring cold I section (3-1), ring cold machine ring in tail gas
II section of (3-2) lower part exhaust outlet connection, cold II section of top (3-2) exhaust outlet of ring cold machine ring cold I section (3-1), ring cold machine ring pass through
Pipeline P10 is connect with reversal valve II (11) entrance, and exhaust gas component detection device I (10) is connect by pipeline P11 with pipeline P10,
The outlet of reversal valve II (11) one is connect by pipeline P12 with booster fan (22-2) entrance, and booster fan (22-2) outlet passes through
Pipeline P13 is connect with reversal valve III (12) entrance, and another outlet of reversal valve II (11) passes through pipeline P14 and booster fan (22-
3) entrance connects, and booster fan (22-3) outlet is connect by pipeline P15 with the top drying grate dryer section (1-1) air inlet, chain
Comb machine dryer section (1-1) lower part exhaust outlet is connect by pipeline P16 with booster fan (22-4) air inlet, booster fan (22-4)
Exhaust outlet removes water desulfuring and denitrifying apparatus (13) air inlet with tail gas outer circulation section dedusting by pipeline P17 and connect, tail gas outer circulation
Section dedusting water removal desulfuring and denitrifying apparatus (13) exhaust outlet is connect by pipeline P18 with reversal valve IV (15) entrance, exhaust gas component
Detection device II (14) is connect by pipeline P19 with pipeline P18, and the outlet of reversal valve IV (15) one passes through pipeline P20 and diffusion mouth
Connection, another outlet of reversal valve IV (15) pass through pipeline P21 and CO2Thick purifying plant (16) entrance connection, CO2Thick purifying plant
(16) outlet passes through pipeline P22 and high concentration CO2Gas gas storage holder (17) connection, high concentration CO2Gas gas storage holder (17) outlet is logical
It crosses P23 to connect with reversal valve V (18) entrance, the outlet of reversal valve V (18) one is entered by pipeline P24 with booster fan (22-5)
Mouth connection, booster fan (22-5) outlet are connect by pipeline P25 with reversal valve III (12) entrance, and reversal valve V (18) one goes out
Mouth passes through pipeline P26 and CO2The connection of cryogenic liquefying purifying plant (19) entrance, CO2Cryogenic liquefying purifying plant (19) outlet passes through
Pipeline P27 and commodity CO2The connection of gas storage holder (20) entrance, outsourcing CO2Gas source (21) passes through pipeline P28 and commodity CO2Gas storage holder
(20) another entrance connection, commodity CO2The outlet of gas storage holder (20) one is connect by pipeline P29 with reversal valve III (12) entrance,
Commodity CO2The outlet of gas storage holder (20) one is connect by pipeline P30 with coal dust transport device for dense phase (5) carrier gas inlet, commodity CO2Storage
The outlet of gas holder (20) one passes through pipeline P31 and conveying outlet connection.
5. according to claim 4 a kind of based on circulation of tail gas O2-CO2Combustion-supporting pelletizing preparation system, which is characterized in that
The system includes feed inlet atmosphere protection device (23) and ring cold machine fuselage atmosphere protection device (24), and the feed inlet atmosphere is protected
Protection unit (23) is installed on the drying grate Handpiece Location, and the ring cold machine fuselage atmosphere protection device (24) is installed on ring cold machine
Between cold II section of III section of (3-2) He Huanleng (3-3) of ring, cold I section of (3-1) He Huanleng, II section of (3-2) tail gas (b) of ring cold machine ring is led
Enter to the ring cold machine fuselage atmosphere protection device (24), is blown and is flowed according to atmosphere protection device local environment pressure-regulated gas
Amount guarantees that the position gas pressure is higher than environmental pressure, prevents air from entering drying grate (1)-rotary kiln (2)-ring cold machine ring cold I
II section of (3-1) He Huanleng of section (3-2), rotary kiln firing up mode, commodity in use CO2The technical grade of outsourcing in gas storage holder (20)
CO2Gas uses CO as protective gas, normal production model2Thick purifying plant (16) middle and high concentration CO2Gas is as protection gas
Body.
6. according to claim 1 a kind of based on circulation of tail gas O2-CO2Combustion-supporting pelletizing production technique, which is characterized in that
Fuel used in the rotary kiln (2) can be coal dust, coke-stove gas and natural gas, or the nitrogen after nitrogen removes
Blast furnace gas, coal gas of converter or coke-stove gas of the product less than 1%；The carrier gas of coal dust uses the commodity CO2In gas storage holder (20)
CO2Gas (f), oxygen concentration >=99.5vol% in industrial pure oxygen.
7. according to claim 4 a kind of based on circulation of tail gas O2-CO2Combustion-supporting pelletizing preparation system, it is characterised in that ring
Cold III section (3-3) uses normal temperature air as the cooling gas of finished ball nodulizing, further strengthens the cooling of finished ball nodulizing, full
The requirement of sufficient finished ball nodulizing storage and transport.
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