CN117604183A - Hot-blast stove blowing and coal injection device and process for top gas circulating blast furnace - Google Patents
Hot-blast stove blowing and coal injection device and process for top gas circulating blast furnace Download PDFInfo
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- CN117604183A CN117604183A CN202311573797.XA CN202311573797A CN117604183A CN 117604183 A CN117604183 A CN 117604183A CN 202311573797 A CN202311573797 A CN 202311573797A CN 117604183 A CN117604183 A CN 117604183A
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- 238000000034 method Methods 0.000 title claims abstract description 69
- 230000008569 process Effects 0.000 title claims abstract description 64
- 238000002347 injection Methods 0.000 title claims abstract description 59
- 239000007924 injection Substances 0.000 title claims abstract description 59
- 239000003245 coal Substances 0.000 title claims abstract description 53
- 238000007664 blowing Methods 0.000 title claims description 30
- 238000010926 purge Methods 0.000 claims abstract description 56
- 238000000926 separation method Methods 0.000 claims abstract description 31
- 239000000428 dust Substances 0.000 claims abstract description 16
- 239000000446 fuel Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 170
- 239000011261 inert gas Substances 0.000 claims description 21
- 238000012545 processing Methods 0.000 claims description 9
- 239000002817 coal dust Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 20
- 238000002485 combustion reaction Methods 0.000 abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- 229910052799 carbon Inorganic materials 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 238000004880 explosion Methods 0.000 description 5
- 238000004200 deflagration Methods 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000005474 detonation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/22—Dust arresters
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention belongs to the technical field of blast furnace ironmaking, and discloses a method capable of reducing N 2 Enrichment problem in top gas circulation process and reduction of CO in ironmaking process 2 A hot blast stove purging and coal injection device and a process for a top gas circulation blast furnace. The device comprises a dust removing device, a residual pressure utilizing device and CO 2 The separation treatment device and the hot blast stove are connected with an air inlet of the top gas circulating blast furnace, and after the gas generated by the top gas circulating blast furnace is dedusted by the dedusting device and recycled by the residual pressure of the residual pressure utilization device, part of the gas is used as fuel to enter the hot blast furnace for heating, and the other part of the gas enters the CO 2 Separation treatment system, CO 2 The high-purity gas obtained by the separation treatment system enters a hot blast stove and is heated to the process required temperature, and then is introduced into a top gas circulation blast furnace air inlet, so as to realize gas circulation and CO 2 Separating CO from the treatment system 2 The air enters the hot blast stove to be used as the purge gas in the combustion and air transferring process of the hot blast stove.
Description
Technical Field
The invention relates to the technical field of blast furnace ironmaking, in particular to a hot blast furnace blowing and coal injection device and a process for a top gas circulation blast furnace.
Background
Under the circumstance that the current double-carbon policy is continuously advancing, the pressure faced by the traditional iron making is increasingly higher. While the shaft furnace smelting process with obvious carbon reduction advantages is continuously developed, the shaft furnace smelting process needs longer development time from realization of large scale. The blast furnace ironmaking is still the main process of ironmaking at present, and will continue to be dominant in a short time, and from the perspective of economy and high efficiency, the development of the top gas circulation blast furnace is more suitable for the development condition of energy conservation and carbon reduction of the short-and-medium-term ironmaking process.
Top gas circulating blast furnaces are currently in a starting and developing stage, and many key problems are to be solved by ironmaking workers. Such as purging in the process of burning and blowing of a hot blast stove, N is adopted at present 2 Purging to ensure the safety of heating gas but to cause N 2 The continuous enrichment in the process can finally lead to continuous reduction of the process gas, thereby affecting the normal operation of the whole production system.
Disclosure of Invention
To reduce N 2 Enrichment problem in top gas circulation process and reduction of CO in ironmaking process 2 The invention provides a blowing and coal injection device and a blowing and coal injection process of a hot blast stove for a top gas circulation blast furnace.
The hot blast stove purging and coal injection device for the top gas circulation blast furnace comprises: dust collector connected to top gas outlet of top gas circulating blast furnace, residual pressure utilizing device connected to the dust collector, and CO connected to the residual pressure utilizing device 2 Separation processing device and CO 2 The hot blast stove connected with the separation treatment device is connected with an air inlet of the top gas circulating blast furnace, and after the gas generated by the top gas circulating blast furnace is dedusted by a dedusting device and recycled by the residual pressure of a residual pressure utilization device, part of the gas is used as fuel to enter the hot blast stove for heating, and the other part of the gas enters CO 2 Separation treatment system, CO 2 The high-purity gas obtained by the separation treatment system enters a hot blast stove and is heated to the process required temperature, and then is introduced into a top gas circulation blast furnace air inlet so as to realize the purposeGas circulation, CO 2 Separating CO from the treatment system 2 The air enters the hot blast stove to be used as the purge gas in the combustion and air transferring process of the hot blast stove.
Further, CO 2 The high-purity gas obtained by the separation treatment system enters the hot blast stove through a first pipeline, and CO 2 Separating CO from the treatment system 2 The gas is introduced into the hot blast stove through a second pipeline, and the hot blast stove purging and coal injection device for the top gas circulation blast furnace further comprises an inert gas adjusting pipeline which is selectively communicated with the second pipeline.
Further, a gas flowmeter is also connected to the second pipeline.
Further, the hot blast stove purging and coal injection device for the top gas circulation blast furnace further comprises a coal powder injection pipeline communicated with the injection port of the top gas circulation blast furnace, wherein the coal powder injection pipeline is used for injecting CO into the top gas circulation blast furnace 2 The gas is pulverized coal as a medium.
Further, CO 2 Separating CO from the treatment system 2 And is also communicated with the blowing pipeline through a third pipeline.
The hot blast stove purging and coal injection process for a top gas circulation blast furnace according to the present invention comprises: after the gas produced by the top gas circulation blast furnace is dedusted and recycled by residual pressure, part of the gas is used as fuel to be sent into the hot blast stove for heating the gas therein, and the rest part of the gas enters CO 2 Separation processing system for separating CO 2 The high-purity gas obtained by the separation treatment system is sent into a hot blast stove and is heated to the process required temperature, and then is introduced into the gas inlet of a top gas circulation blast furnace, so as to realize gas circulation, and simultaneously CO is recycled 2 Separating CO from the treatment system 2 The air is fed into the hot blast stove as the purge gas in the combustion-to-air supply process of the hot blast stove.
Further, the hot blast stove purging and coal injection process for the top gas circulation blast furnace further comprises the step of mixing CO 2 Separating CO from the treatment system 2 And the preset amount of inert gas is fed into the hot blast stove together to be used as purge gas in the combustion-to-air supply process of the hot blast stove.
Further, inert gas and CO 2 The dosage ratio of (2) is less than 1:3.
Further, the hot blast stove purging and coal injection process for the top gas circulation blast furnace further comprises the step of injecting CO into the injection port of the top gas circulation blast furnace 2 。
Further, the hot blast stove purging and coal injection process for the top gas circulation blast furnace further comprises the step of mixing CO 2 Separating CO from the treatment system 2 And is fed into the blowing port of the hot blast stove.
Compared with the prior art, the blowing and coal injection device and the process for the hot blast stove for the top gas circulating oxygen blast furnace have the following advantages that the process is smooth, the energy is saved, the carbon emission is reduced and the comprehensive utilization of resources is realized:
1) Using inert CO 2 The gas sweeps the hot blast stove, the sweeping process is safe, the higher sensible heat of the blast furnace can be brought, a foundation is laid for ensuring the process conditions of the blast furnace in the early stage of air supply, and the method has feasibility in technology;
2)CO 2 feeding into a furnace, combining high oxygen enrichment or pure oxygen feeding into the furnace, and enhancing the reduction atmosphere in the furnace while ensuring the combustion temperature of an iron-making tuyere of the blast furnace, reducing the direct reduction degree, and achieving the purposes of reducing the coke ratio and reducing the carbon emission;
3)CO 2 purge all or most of the N 2 Purging due to CO 2 The method is a by-product of the top gas circulation process, can realize further cyclic utilization of carbon, reduce the fuel ratio, greatly reduce the production cost and has great economic advantages;
4)CO 2 the separation treatment system obtains high-purity gas, can improve the utilization efficiency of the gas fed into the furnace, and separates CO 2 The gas is partially recycled, so that the carbon recycling rate is comprehensively improved, and the carbon emission is reduced.
Drawings
FIG. 1 is a schematic diagram of a top gas circulation oxygen blast furnace hot blast stove purging and coal injection apparatus according to an embodiment of the present invention;
FIG. 2 is CO 2 And respectively carrying out a graph of the relation between the injection quantity and the theoretical combustion temperature and the direct reduction degree.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings for a better understanding of the objects, structures and functions of the present invention.
Fig. 1 shows the structure of a hot blast stove purging and coal injection device 100 for a top gas circulation blast furnace according to an embodiment of the invention. As shown in fig. 1, the hot blast stove purging and coal injection device 100 for a top gas circulation blast furnace may include: a dust removing device 2 connected with a top gas outlet 11 of the top gas circulation blast furnace 1, a residual pressure utilizing device 3 connected with the dust removing device 2, and CO connected with the residual pressure utilizing device 3 2 Separation processing device 4 and CO 2 The hot blast stove 5 connected with the separation treatment device 4, the hot blast stove 5 is connected with the air inlet 12 of the top gas circulation blast furnace 100, the gas generated by the top gas circulation blast furnace 1 is dedusted by the dedusting device 2 and recycled by the residual pressure of the residual pressure utilization device 3, part of the gas is used as fuel to enter the hot blast stove 5 for heating, and the other part of the gas enters the CO 2 Separation treatment system 4, CO 2 The high-purity gas obtained by the separation treatment system 4 enters the hot blast stove 5 and is heated to the process required temperature and then is introduced into the bottom air inlet 12 of the top gas circulation blast furnace 1, so as to realize gas circulation and CO 2 Separating CO from the treatment system 4 2 And the air enters the hot blast stove 5 to be used as purge gas in the combustion-to-air supply process of the hot blast stove 5.
When the hot blast stove purging and coal injection device 100 for the top gas circulation blast furnace of the embodiment of the invention works, part of the gas generated by the top gas circulation blast furnace 1 enters the hot blast stove 5 as fuel for heating after dust removal and residual pressure recycling, and the other part enters CO 2 A separation processing system 4; CO 2 The high-purity gas obtained by the separation treatment system 4 is heated to the process requirement temperature through the hot blast stove 5 and then is introduced into the top gas circulating blast furnace 1, so that gas circulation is realized; in the process of changing the combustion of the hot blast stove 5 into the air supply, CO is utilized to avoid the explosion phenomenon after the high-purity coal gas is fed into the stove 2 Separating CO from the system 2 Purging with CO 2 After entering the top gas circulation blast furnace 1, a series of reactions are carried out, and the reactants and related products are all mixed with the gas in the furnaceThe components are the same, no impurity gas is introduced, and the method is similar to the prior art in application of N 2 Compared with the blowing gas in the process of burning and blowing the hot blast stove 5, the hot blast stove blowing and coal injection device 100 for the top gas circulation blast furnace solves the problem that residual flue gas and circulating gas in the hot blast stove 5 generate deflagration (explosion); at the same time due to CO 2 Other impurity gases are not introduced after the gas enters the top gas circulation blast furnace 1 through blowing, so that the reducibility of the gas in the furnace is ensured; in addition, due to CO 2 After entering the top gas circulation blast furnace 1, CO is generated by the reaction with C in the top gas circulation blast furnace, the reducing atmosphere in the furnace is further enhanced, the indirect reduction degree is increased, the direct reduction degree is reduced, and the reduction of the fuel ratio can be realized.
In the preferred embodiment as shown in FIG. 1, CO 2 The high-purity gas obtained by the separation treatment system 4 can enter the hot blast stove 5 and CO through the first pipeline 71 2 Separating CO from the treatment system 4 2 The stove 5 may be accessed through a second conduit 72 and the stove purging and coal injection device 100 for a top gas circulation blast furnace may further include an inert gas adjustment conduit 75 in optional communication with the second conduit 72. The inert gas conditioning line 75 is used for the CO 2 Insufficient amount of (C) or CO 2 Failure of separation processing system 4 to produce CO 2 In the case of (a) feeding an inert gas (preferably N) 2 ) So as to ensure an 'inert' atmosphere in the hot blast stove 5 to prevent deflagration, detonation or explosion with the flue gas when the gas is heated in the stove.
Preferably, the second pipeline 72 is also connected to a system for metering CO 2 Is a gas flow meter. Likewise, the inert gas adjustment pipe 75 may be provided with a second gas flow meter for metering inert gas, and the stove purging and coal injection device 100 for a top gas circulation blast furnace may further comprise detection means and control means, when the detection means detects CO delivered to the stove 5 via the second pipe 72 2 When the amount of (2) is insufficient, the control device controls the inert gas adjustment pipeline 75 to be opened so as to purge inert gas into the hot blast stove 5, thereby ensuring an 'inert' atmosphere in the hot blast stove 5; and when the detection means detects delivery via the second conduit 72CO to the stove 5 2 When the amount of (2) is sufficient, the control device controls the inert gas adjustment pipe 75 to be closed.
In accordance with the present invention, in a preferred embodiment as shown in FIG. 1, the hot blast stove purging and coal injection device 100 for a top gas circulation blast furnace may further comprise a pulverized coal injection pipe 73 communicating with the injection port 13 of the top gas circulation blast furnace 1, the pulverized coal injection pipe 73 being for injecting CO 2 The gas is medium and coal dust is blown into the top gas circulation blast furnace 1. This embodiment further employs CO during pulverized coal injection 2 The gas can further solve the problem that inert gas (such as N 2 ) Is a problem of enrichment.
Preferably, as shown in FIG. 1, CO 2 Separating CO from the treatment system 4 2 And may also be in communication with the blowing pipe 73 through a third pipe 74. The arrangement is such that the CO 2 Separating CO from the treatment system 4 2 Can be simultaneously introduced into the injection pipe 73 for injecting the top gas circulation blast furnace 1, thereby further improving the CO 2 Is used for the utilization efficiency of the system.
In the preferred embodiment shown in fig. 1, in order to enhance the dust removing effect of the dust removing device 2, the dust removing device 2 may include a gravity dust remover 21 and a bag dust remover 22 connected in sequence. Also preferably, the dust removing device 2 and the CO 2 The separation treatment system 4 is also connected with a pressure reducing valve group 6, and an air inlet and an air outlet of the residual pressure utilizing device 3 are respectively connected with two ends of the pressure reducing valve group 6, so that when the residual pressure utilizing device 3 fails, the pressure reducing valve group 6 is opened to ensure that the gas generated by the top gas circulating blast furnace 1 still can normally enter the hot blast stove 5 and CO 2 In the separation processing system 4.
The invention also provides a hot blast stove blowing and coal injection process for the top gas circulation blast furnace, which can comprise the following steps: after the gas generated by the top gas circulation blast furnace 1 is dedusted and recycled by residual pressure, part of the gas is used as fuel to be sent into the hot blast stove 5 for heating, and the other part of the gas enters CO 2 Separation processing system 4 for separating CO 2 The high-purity gas obtained by the separation treatment system 4 is sent into a hot blast stove 5 and is heated to the process required temperature and then is introduced into the gas inlet of the top gas circulation blast furnace 1Port 12 for gas circulation while CO 2 Separating CO from the treatment system 4 2 The air is fed into the hot blast stove 5 as the purge gas in the combustion-to-air blowing process of the hot blast stove.
Application N in the prior art 2 Compared with the process of blowing gas in the process of burning and blowing the hot blast stove 5, the hot blast stove blowing and coal injection process for the top gas circulation blast furnace solves the problem that residual flue gas and circulating gas in the hot blast stove 5 generate deflagration (explosion); at the same time due to CO 2 Other impurity gases are not introduced after the gas enters the top gas circulation blast furnace 1 through blowing, so that the reducibility of the gas in the furnace is ensured; in addition, due to CO 2 After entering the top gas circulation blast furnace 1, CO is generated by the reaction with C in the top gas circulation blast furnace, the reducing atmosphere in the furnace is further enhanced, the indirect reduction degree is increased, the direct reduction degree is reduced, and the reduction of the fuel ratio can be realized.
In a preferred embodiment, the hot blast stove purging and coal injection process for a top gas circulation blast furnace may further comprise CO 2 Separating CO from the treatment system 4 2 And a preset amount of inert gas is sent into the hot blast stove 5 together to be used as purge gas in the combustion-to-air supply process of the hot blast stove. The use of the preset amount of inert gas can be in CO 2 Insufficient amount of (C) or CO 2 Failure of separation processing system 4 to produce CO 2 In order to ensure an "inert" atmosphere in the stove 5 to prevent deflagration, detonation or explosion with the flue gases when the gas is heated in the stove.
Preferably, an inert gas (preferably N 2 ) With CO 2 The dosage ratio of (2) is less than or equal to 1:3. This arrangement allows N to be reduced while ensuring an "inert" atmosphere within the stove 5 2 Is enriched with an inert gas (preferably N 2 ) With CO 2 The amount of (c) may be adjusted according to the actual process, and is not particularly limited herein.
The hot blast stove purging and coal injection process for the top gas circulation blast furnace according to the embodiment of the invention can also comprise the step of injecting CO into the injection port 13 of the top gas circulation blast furnace 1 2 . This embodiment enables the top gas circulation blast furnace 1 to further perform pulverized coal injectionAdopts CO 2 The gas can further solve the problem that inert gas (such as N 2 ) Is a problem of enrichment.
Preferably, to further increase CO 2 Can also be used for CO 2 Separating CO from the treatment system 2 Into the injection port 13 of the stove 1.
Below at 400m 3 Blast furnace top gas circulation for example, the blowing and coal injection device and the process productivity of the blast furnace top gas circulation oxygen blast furnace adopting the embodiment of the invention are verified, wherein the raw materials for iron making and furnace feeding are pellets: sinter = 25:75, the comprehensive grade is 58.6%; reference period: 360kg coke ratio, 160kg coal ratio and 3% oxygen enrichment.
1. First study of CO 2 Influence of the blowing furnace on the theoretical combustion temperature and the direct reduction degree of the blast furnace:
(1) Pulverized coal injection burns at the tuyere (i.e., injection port 13):
C+1/2O 2 =co 9781.2kJ/kg (exothermic)
(2) Tuyere (i.e. bottom inlet 12) CO 2 Is a combustion of:
CO 2 +c=2co-13794 kJ/kg (endothermic)
Taking graphite state C as a standard, the reaction gibbs free energy is as follows:
CO 2 +c (stone) =2co Δ rGm θ=166550-171T J/mol
When T >974K, delta rGm theta <0, the reaction proceeds in the forward direction; and the reaction can be completely carried out in consideration of the strong reactivity of the graphite state C and the high temperature of the tuyere zone.
1)1mol CO 2 +1mol C reaction replaces 2mol C+O 2 CO generated by combustion keeps the reducing atmosphere in the furnace unchanged; the coke ratio is unchanged, and pulverized coal injection is replaced;
2)CO 2 +C is an endothermic reaction, taking into account CO 2 The sensible heat is brought in by high-temperature blowing; to ensure the combustion temperature of the tuyere, the oxygen enrichment rate is increased;
as can be seen from the calculation and fig. 2:
(1) Every 1Nm increase in ton iron injection 3 CO of (c) 2 Replacing 0.7kg of pulverized coal to realize partial carbonEmission reduction;
(2)CO 2 blowing, every 1Nm of ton iron increase 3 Deducting CO 2 The influence of equivalent coal powder replacement on combustion temperature, and each 1Nm of ton iron increase 3 The theoretical combustion temperature is reduced by 4-5 ℃;
(3) Per ton of iron increase of 1Nm 3 ，r d Reducing the reduction by 0.0002, and indirectly reducing and developing the furnace.
2. Study on CO for purging during smelting of top gas circulating blast furnace 1 2 Influence of furnace charging:
(1) Charging volume of the hot blast stove to 150Nm3, and CO for purging 2 Heating to 1200 ℃;
(2)400m 3 the utilization coefficient of the blast furnace is 4-4.5;
(3) The calculation shows that when the top gas circulating oxygen blast furnace realizes self circulation, the furnace inlet air quantity is 950Nm 3 /min；
(4) Theoretical calculation shows that CO is used for purging 2 All of the materials are put into the furnace within 0.16 seconds; when the utilization coefficient is increased, the blast volume per unit time is increased, and the CO is further shortened 2 And (5) charging time.
3. Conclusion(s)
(1)CO 2 Purging, namely, replacing equivalent pulverized coal by 0.7kg, and reducing the combustion temperature by 4-5 ℃;
(2) CO for purging 2 Blowing into the blast furnace within 0.16 seconds; when the utilization coefficient increases, CO 2 The furnace charging time is further shortened;
(3) Consider CO 2 The furnace charging time is extremely short, partial reaction can be carried out, the influence on the theoretical combustion temperature is reduced, and the smooth running of the blast furnace can be ensured; in cycle N 2 When the enrichment amount of (2) is balanced with the discharge amount of the top gas heating hot blast stove, a proper amount of N can be considered 2 With CO 2 Mixing and purging;
(4)CO 2 after blowing the hot air furnace, the furnace is put into the furnace, which can solve the problem of N 2 N of the purge process 2 Enrichment problems;
(5) Gas circulation blast furnace and conventional blast furnace using CO 2 The equivalent coal dust can be replaced by the blowing furnace technology, so that carbon circulation and carbon emission reduction are realized.
In conclusion, the method comprises the steps of,the hot blast stove purging and coal injection device 100 and the process for the top gas circulation blast furnace of the embodiment of the invention introduce no or less impurity gas (CO can be adopted according to actual needs 2 Purge while incorporating a small amount of inert gas), to CO 2 The furnace feeding mechanism and the influence of the furnace feeding mechanism on other process parameters are analyzed, and the CO is recycled on the premise of ensuring key process parameters such as theoretical combustion temperature and the like 2 The gas is used as the purge gas and the blowing gas in the process of burning and blowing the hot blast stove, so that the indirect reduction degree of iron can be increased, the direct reduction degree can be reduced, the fuel ratio can be reduced to a certain extent, and further, the technical support is provided for realizing carbon neutralization.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (10)
1. A hot blast stove purging and coal injection device for a top gas circulating blast furnace, comprising: the device comprises a dust removing device connected with a top gas outlet of the top gas circulating blast furnace, a residual pressure utilization device connected with the dust removing device, and CO connected with the residual pressure utilization device 2 Separation treatment device and CO 2 The hot blast stove is connected with the separation treatment device, is connected with the bottom air inlet of the top gas circulation blast furnace, and gas generated by the top gas circulation blast furnace passes through the top gas circulation blast furnaceAfter the dust removal device removes dust and the residual pressure utilization device recovers and utilizes the residual pressure, part of the residual pressure is used as fuel to enter the hot blast stove for heating, and the other part of the residual pressure enters the CO 2 Separation treatment system, said CO 2 The high-purity gas obtained by the separation treatment system enters the hot blast stove and is heated to the process required temperature and then is introduced into the gas inlet of the top gas circulation blast furnace, so as to realize gas circulation, and the CO is recycled 2 Separating CO from the treatment system 2 And the air enters the hot blast stove to be used as purge gas in the combustion-to-air supply process of the hot blast stove.
2. The hot blast stove purging and coal injection device for a top gas circulation blast furnace according to claim 1, wherein said CO 2 The high-purity gas obtained by the separation treatment system enters the hot blast stove through a first pipeline, and the CO 2 Separating CO from the treatment system 2 The hot blast stove purging and coal injection device for the top gas circulation blast furnace further comprises an inert gas adjusting pipeline which is selectively communicated with the second pipeline.
3. The hot blast stove purging and coal injection device for a top gas circulation blast furnace according to claim 2, wherein a gas flow meter is further connected to said second pipe.
4. A stove purging and coal injection device for a top gas circulation blast furnace according to any one of claims 1 to 3, further comprising a coal dust injection pipe in communication with the injection port of the top gas circulation blast furnace for injecting CO 2 And the gas is medium and coal dust is injected into the top gas circulation blast furnace.
5. The hot blast stove purging and coal injection device for a top gas circulation blast furnace as set forth in claim 4, wherein said CO 2 Separating CO from the treatment system 2 Still lead toAnd the third pipeline is communicated with the jetting pipeline.
6. A hot blast stove purging and coal injection process for a top gas circulating blast furnace, comprising: after the gas produced by the top gas circulation blast furnace is dedusted and recycled by residual pressure, part of the gas is used as fuel to be sent into the hot blast stove for heating, and the other part of the gas enters CO 2 Separation processing system for separating CO 2 The high-purity gas obtained by the separation treatment system is sent into the hot blast stove and is introduced into the bottom air inlet of the top gas circulation blast furnace after being heated to the process required temperature, so as to realize gas circulation, and simultaneously the CO is recycled 2 Separating CO from the treatment system 2 And the air is fed into the hot blast stove to be used as purge gas in the combustion-to-air supply process of the hot blast stove.
7. The hot blast stove purging and coal injection process for a top gas circulation blast furnace as set forth in claim 6, further comprising purging said CO 2 Separating CO from the treatment system 2 And the preset amount of inert gas is fed into the hot blast stove together to be used as purge gas in the combustion-to-air supply process of the hot blast stove.
8. The hot blast stove purging and coal injection process for a top gas circulation blast furnace as set forth in claim 7, wherein said inert gas is mixed with said CO 2 The dosage ratio of (2) is less than 1:3.
9. The hot blast stove purging and coal injection process for a top gas circulation blast furnace as set forth in claim 6, further comprising injecting CO into a injection port of said top gas circulation blast furnace 2 。
10. The hot blast stove purging and coal injection process for a top gas circulation blast furnace as set forth in claim 9, wherein said hot blast for a top gas circulation blast furnaceThe furnace purging and coal injection process further includes the step of adding the CO 2 Separating CO from the treatment system 2 And the air is fed into a blowing port of the hot blast stove.
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| CN202311573797.XA CN117604183A (en) | 2023-11-23 | 2023-11-23 | Hot-blast stove blowing and coal injection device and process for top gas circulating blast furnace |
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| CN202311573797.XA CN117604183A (en) | 2023-11-23 | 2023-11-23 | Hot-blast stove blowing and coal injection device and process for top gas circulating blast furnace |
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