CN108579300B - Wet-type purification treatment method and system for blast furnace flue gas of steel plant - Google Patents
Wet-type purification treatment method and system for blast furnace flue gas of steel plant Download PDFInfo
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- CN108579300B CN108579300B CN201810470788.0A CN201810470788A CN108579300B CN 108579300 B CN108579300 B CN 108579300B CN 201810470788 A CN201810470788 A CN 201810470788A CN 108579300 B CN108579300 B CN 108579300B
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 239000003546 flue gas Substances 0.000 title claims abstract description 51
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 38
- 239000010959 steel Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000000746 purification Methods 0.000 title claims abstract description 31
- 239000000428 dust Substances 0.000 claims abstract description 101
- 239000007789 gas Substances 0.000 claims abstract description 79
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000003513 alkali Substances 0.000 claims abstract description 54
- 238000005507 spraying Methods 0.000 claims abstract description 54
- 239000007788 liquid Substances 0.000 claims abstract description 40
- 238000001179 sorption measurement Methods 0.000 claims abstract description 35
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 33
- 230000001590 oxidative effect Effects 0.000 claims abstract description 31
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000002245 particle Substances 0.000 claims abstract description 19
- 238000005189 flocculation Methods 0.000 claims abstract description 15
- 230000016615 flocculation Effects 0.000 claims abstract description 15
- 238000001556 precipitation Methods 0.000 claims abstract description 12
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 9
- 239000000243 solution Substances 0.000 claims description 18
- 238000000889 atomisation Methods 0.000 claims description 16
- 239000008394 flocculating agent Substances 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 239000007800 oxidant agent Substances 0.000 claims description 11
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 10
- 230000003311 flocculating effect Effects 0.000 claims description 8
- 239000000443 aerosol Substances 0.000 claims description 6
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 230000005684 electric field Effects 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 239000002808 molecular sieve Substances 0.000 claims description 6
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 6
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000012286 potassium permanganate Substances 0.000 claims description 4
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 4
- JHWIEAWILPSRMU-UHFFFAOYSA-N 2-methyl-3-pyrimidin-4-ylpropanoic acid Chemical compound OC(=O)C(C)CC1=CC=NC=N1 JHWIEAWILPSRMU-UHFFFAOYSA-N 0.000 claims description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 3
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- AXZAYXJCENRGIM-UHFFFAOYSA-J dipotassium;tetrabromoplatinum(2-) Chemical compound [K+].[K+].[Br-].[Br-].[Br-].[Br-].[Pt+2] AXZAYXJCENRGIM-UHFFFAOYSA-J 0.000 claims description 3
- 150000002505 iron Chemical class 0.000 claims description 3
- 229910001487 potassium perchlorate Inorganic materials 0.000 claims description 3
- 239000008263 liquid aerosol Substances 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 22
- 229910052742 iron Inorganic materials 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 abstract description 5
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
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- 239000003595 mist Substances 0.000 description 8
- 239000007921 spray Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000003463 adsorbent Substances 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
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- 239000002253 acid Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003517 fume Substances 0.000 description 3
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910052815 sulfur oxide Inorganic materials 0.000 description 2
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
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- 239000011449 brick Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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- 230000000630 rising effect Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D51/00—Auxiliary pretreatment of gases or vapours to be cleaned
- B01D51/02—Amassing the particles, e.g. by flocculation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/38—Removing components of undefined structure
- B01D53/44—Organic components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
-
- 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
- B01D53/75—Multi-step processes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/22—Dust arresters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/104—Ozone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D2253/10—Inorganic adsorbents
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
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- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
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Abstract
The invention relates to the field of steel production, in particular to a wet-type purification treatment method and system for blast furnace flue gas of a steel plant. The invention provides a wet purification treatment method for blast furnace flue gas of a steel plant, which comprises the following steps: introducing flocculation liquid into the flue gas to be treated, and performing water film dust removal treatment; introducing an oxidizing solution into the obtained gas, and carrying out alkali liquor spraying treatment; introducing ozone into the obtained gas, and performing wet-type electric precipitation treatment; the resulting gas is subjected to an adsorption treatment. The wet purification treatment method and the wet purification treatment system for the blast furnace flue gas of the iron and steel plant provided by the invention can effectively reduce pollutants such as dust particles, oxysulfide, nitric oxide, carbon monoxide and the like in the blast furnace flue gas of the iron and steel plant through treatment methods such as flocculation, water film dust removal, oxidation, alkali liquor spraying, ozone mixing, wet electric dust removal, adsorption and the like, are reasonable and efficient post-treatment methods, and are suitable for industrial large-scale application.
Description
Technical Field
The invention relates to the field of steel production, in particular to a wet-type purification treatment method and system for blast furnace flue gas of a steel plant.
Background
Blast furnaces are generally smelting equipment in which a steel plate is used as a furnace shell, and a refractory brick lining is built in the shell. Because the blast furnace ironmaking technology has the advantages of good economic index, simple process, large production capacity, high labor production efficiency, low energy consumption and the like, the iron produced by the method accounts for the vast majority of the total iron production in the world.
In the production of blast furnaces, iron ore, coke, and a flux for slag formation (limestone) are generally charged from the top of the furnace, and preheated air is blown through tuyeres located along the periphery of the furnace at the lower part of the furnace. Carbon in coke (some blast furnaces also blow auxiliary fuel such as coal dust, heavy oil, natural gas and the like) at high temperature is combusted with oxygen blown into air to generate carbon monoxide and hydrogen, and oxygen in iron ore is removed in the ascending process in the furnaces, so that iron is obtained by reduction. The molten iron thus produced is discharged from the taphole, and the unreduced impurities in the iron ore are combined with a flux such as limestone to produce slag, which is discharged from the taphole, and the resulting exhaust gas is discharged from the furnace top.
In recent years, with the development of science and technology and the progress of human beings, the requirements on the post-treatment of the emission of various wastes and waste gases are higher and higher, and the smelting industry has the characteristics of large emission of waste gases, high pollutant content and the like, so that the post-treatment technology of the waste gases like blast furnace smoke and the like is urgently required to be further improved.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, the present invention provides a wet cleaning method and system for blast furnace flue gas in steel plant, which is used to solve the problems in the prior art.
In order to achieve the above and other related objects, a first aspect of the present invention provides a wet purification treatment method for blast furnace flue gas from a steel plant, comprising:
1) introducing flocculation liquid into the flue gas to be treated, and performing water film dust removal treatment;
2) introducing an oxidizing solution into the obtained gas, and carrying out alkali liquor spraying treatment;
3) introducing ozone into the obtained gas, and performing wet-type electric precipitation treatment;
4) the resulting gas is subjected to an adsorption treatment.
In some embodiments of the present invention, the flocculation liquid is a flocculation liquid mist, the particle size of the atomized liquid droplets is 5-200 um, and the amount of the flocculation liquid mist is 1-100 ml/(m)3*min)。
In some embodiments of the invention, the flocculation liquid is an aqueous solution of a flocculant selected from an inorganic flocculant and/or an organic flocculant.
In some embodiments of the invention, the flocculant is selected from an aluminum salt flocculant and/or an iron salt flocculant.
In some embodiments of the invention, the concentration of the flocculant is 1 to 500 mg/L.
In some embodiments of the invention, the liquid-gas ratio of the water film dedusting treatment is 0.1-0.6L/m3。
In some embodiments of the invention, the method of water film dedusting treatment is selected from the group consisting of one or more of shock water film treatment, inert water film treatment, and centrifugal water film treatment.
In some embodiments of the present invention, the oxidizing liquid is an oxidizing liquid mist, the particle size of the atomized liquid droplets is 5-200 um, and the amount of the oxidizing liquid mist is 1-100 ml/(m)3*min)。
In some embodiments of the present invention, the oxidizing solution is an aqueous solution of an oxidizing agent, and the oxidizing agent is selected from one or a mixture of potassium permanganate, potassium perchlorate, ammonium persulfate, sodium dichromate and sodium hypochlorite.
In some embodiments of the invention, the concentration of the oxidizing solution is 0.05 to 2 mol/L.
In some embodiments of the invention, the lye used in the lye spray treatment comprises NH4HCO3And/or (NH)4)2CO3The concentration of the alkali liquor is 0.1-5 mol/L.
In some embodiments of the invention, the liquid-gas ratio in the lye spraying treatment is 1.5-3L/m3Spraying density of 50-100m3/(m2*h)。
In some embodiments of the invention, the amount of ozone introduced into the gas is 100-1500mg/m3。
In some embodiments of the invention, the wet electric precipitation treatment is selected from cross-flow wet electric precipitation treatment and/or vertical-flow wet electric precipitation treatment.
In some embodiments of the invention, the wet electric dust collector adopts a plate type or multilayer screen plate type anode and a fishbone needle line type cathode, the wind speed of an electric field is 0.4-1.5m/s, the retention time is 6-12s, the water consumption is 0.2-10t/h, and the power is 400 KW/h.
In some embodiments of the invention, the adsorption treatment is performed using activated carbon and/or molecular sieves.
In some embodiments of the invention, the space velocity of the adsorption treatment is 2000--1The superficial velocity is 0.2-0.5m/s, and the retention time is 2-5 s.
The invention provides a wet purification treatment system for blast furnace flue gas of a steel plant, which comprises:
the device comprises a water film dust removal device, a first atomizing device and a second atomizing device, wherein the water film dust removal device is used for performing water film dust removal treatment on gas to be treated;
the alkali liquor spraying device is used for carrying out alkali liquor spraying treatment on the gas obtained by the water film dust removal treatment, and a second atomizing device used for introducing oxidizing liquid into the gas obtained by the water film dust removal treatment is arranged at the inlet of the alkali liquor spraying device;
the wet-type electric dust removal device is used for carrying out wet-type electric dust removal treatment on the gas obtained by the alkali liquor spraying treatment, and an ozone generating device used for introducing ozone into the gas obtained by the alkali liquor spraying treatment is arranged at an inlet of the wet-type electric dust removal device;
and the adsorption device is used for carrying out adsorption treatment on the gas obtained by wet electric precipitation treatment.
In some embodiments of the invention, the first and/or second atomization means is selected from the group consisting of a pressure atomizer, an ultrasonic atomizer, and a combination of one or more of ultrasound.
In some embodiments of the present invention, the first atomization device and/or the second atomization device has atomized droplets with a particle size of 5-200 um, and the amount of the aerosol is 1-100 ml/(m)3*min)。
In some embodiments of the invention, the liquid-gas ratio of the water film dust removal device is 0.1-0.6L/m3。
In some embodiments of the invention, the water film dust removal device is selected from the group consisting of an impact water film dust remover, an inert water film dust remover, and a centrifugal water film dust remover.
In some embodiments of the present invention, the lye used in the lye spraying device comprises NH4HCO3And/or (NH)4)2CO3The concentration of the alkali liquor is 0.1-5 mol/L.
In some embodiments of the invention, the liquid-gas ratio in the lye spraying devices is 1.5-3L/m3Spraying density of 50-100m3/(m2*h)。
In some embodiments of the present invention, the ozone generating amount of the ozone generating device is 100-1500mg/m3。
In some embodiments of the invention, the wet electric dust removal device is selected from a cross-flow wet electric dust removal device and/or a vertical-flow wet electric dust removal device.
In some embodiments of the invention, the adsorbent media in the adsorbent device is selected from activated carbon and/or molecular sieves.
Drawings
FIG. 1 is a schematic diagram of the processing method and system of the present invention.
Description of the element reference numerals
1 Water film dust removal device
2 first atomizing device
3 alkali liquor spraying device
4 second atomization device
5 wet type electric dust remover
6 ozone generator
7 adsorption device
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The invention provides a wet purification treatment method for blast furnace flue gas of a steel plant, which comprises the following steps: will be provided withIntroducing flocculation liquid into the flue gas to be treated, and performing water film dedusting treatment. The wet-type purification treatment method for the blast furnace flue gas of the steel plant provided by the invention can be mainly used for treating the blast furnace flue gas of the steel plant, the main components of the flue gas to be treated generally comprise dust particles, sulfur oxides, nitrogen oxides, carbon monoxide and other components, wherein the dust particles can reach 1600mg/Nm3Above, the sulfur dioxide content can reach 1000mg/Nm3Above, the content of nitric oxide can reach 400mg/Nm3Above, the content of carbon monoxide can reach 1000mg/Nm3Above, the rest is mainly N2. . The flocculating solution can be flocculating solution aerial fog, the particle size of atomized liquid drops can be 5-200 um, and the using amount of the flocculating solution aerial fog can be 1-100 ml/(m)3Min). The person skilled in the art may select suitable methods for introducing the mist of flocculating liquid into the gas, for example by spraying. The flocculating solution can be an aqueous solution of a flocculating agent, the flocculating agent can be selected from inorganic flocculating agents and/or organic flocculating agents, the flocculating agent is preferably selected from aluminum salt flocculating agents and/or iron salt flocculating agents, and the concentration of the flocculating agent can be 1-500 mg/L. The water film dust removal treatment generally refers to a treatment method of capturing dust by a water film caused by a certain method by utilizing dust-containing gas to impact the inner wall of a dust remover or other special members, and purifying gas, and large particle dust flocculated in flue gas can be captured by the water film to be purified. The liquid-gas ratio of the water film dedusting treatment can be 0.1-0.6L/m3The method of the water film dust removal treatment may be selected from one or more of a combination of an impact water film treatment, an inert water film treatment and a centrifugal water film treatment, and large particle dust in the gas obtained by the water film dust removal treatment may be flocculated and substantially removed by the flocculation solution.
The wet purification treatment method for the blast furnace flue gas of the steel plant provided by the invention can also comprise the following steps: and introducing an oxidizing solution into the obtained gas, and carrying out alkali liquor spraying treatment. In the treatment method, the main function of the introduced oxidant is to oxidize SO in the flue gas2NO and volatile organic compounds, the oxidizing liquid can be oxidizing liquid aerial fog, the particle size of atomized liquid drops can be 5-200 um, and the using amount of the oxidizing liquid aerial fogCan be 1-100 ml/(m)3Min) (1-100 ml of atomized liquid per cubic meter of exhaust gas per minute). The person skilled in the art may select a suitable method for introducing the aerosol of oxidizing liquid into the gas, for example by spraying. The oxidizing solution can be an aqueous solution of an oxidizing agent, the oxidizing agent can be one or a mixture of potassium permanganate, potassium perchlorate, ammonium persulfate, sodium dichromate and sodium hypochlorite, and the concentration of the oxidizing solution can be 0.05-2 mol/L. The main effect of the alkali liquor spraying treatment is to remove SO in the oxidized flue gas3、NO2And the like. The lye used in the lye spray treatment may comprise NH4HCO3And/or (NH)4)2CO3The concentration of the alkali liquor can be 0.1-5mol/L, and the liquid-gas ratio in the alkali liquor spraying treatment can be 1.5-3L/m3The spraying density can be 50-100m3/(m2H), the nitrogen oxides (mainly NO) in the gas obtained by the alkali liquor spraying treatment can be oxidized into NO which is easily dissolved in water2Higher order Nitrogen Oxides (NO)2) With Sulfur Oxides (SO)2、SO3) Finally absorbed by the alkali liquor and basically removed.
The wet purification treatment method for the blast furnace flue gas of the steel plant provided by the invention can also comprise the following steps: introducing ozone into the obtained gas, performing wet-type electric precipitation treatment, wherein the main function of the introduced ozone is to generate ozone with strong oxidizing property, and spraying SO escaped from the alkali liquor spray tower2NO and other substances which are difficult to oxidize and CO are further oxidized and destroyed to basically destroy and remove the substances which can be oxidized, and the introduction amount of ozone in the gas can be 100-1500mg/m3. The wet-type electric precipitation treatment generally refers to a treatment method for charging dust by using high-voltage corona discharge, and the charged dust is collected under the action of an electric field force so as to remove the dust in gas, wherein the main action of the wet-type electric precipitation treatment is to acid mist, heavy metals and PM10And PM2.5The fine dust has good removing effect and can effectively trap fine Particulate Matters (PM)2.5、SO3Aerosol formed by acid mist), heavy metals (Hg, As, Se, Pb, Cr), organic matters (polycyclic aromatic hydrocarbon, dioxan)Quartz), etc., to substantially remove the above-mentioned effectively trapped species, which may be selected from cross-flow wet electric precipitation treatment and/or vertical wet electric precipitation treatment. The wet electric dust collector can be a plate type or multilayer screen printing plate type anode and a fishbone needle line type cathode, the wind speed of an electric field can be 0.4-1.5m/s, the retention time can be 6-12s, the water consumption can be 0.2-10t/h, and the power can be 100 KW/h.
The wet purification treatment method for the blast furnace flue gas of the steel plant provided by the invention can also comprise the following steps: and subjecting the obtained gas to adsorption treatment, wherein the adsorption treatment generally refers to a treatment method for removing adsorbable substances in the gas by adsorbing the gas by using an adsorption medium, and carbon dioxide in the gas obtained by the adsorption treatment can be effectively adsorbed by an adsorbent so as to be mostly or basically removed. The adsorbent treatment may be carried out by any suitable material or method, typically by using the adsorption capacity of the microporous medium, to further adsorb the adsorbable component of the gas to achieve emission standards, for example, activated carbon and/or molecular sieves.
As shown in fig. 1, another aspect of the present invention provides a wet purification treatment system for blast furnace flue gas of a steel plant, comprising:
the device comprises a water film dust removal device 1 for performing water film dust removal treatment on gas to be treated, wherein a first atomization device 2 for introducing flocculation liquid into treated flue gas is arranged at an inlet of the water film dust removal device;
the alkali liquor spraying device 3 is used for carrying out alkali liquor spraying treatment on the gas obtained by the water film dust removal treatment, and a second atomizing device 4 used for introducing oxidizing liquid into the gas obtained by the water film dust removal treatment is arranged at the inlet of the alkali liquor spraying device;
the wet-type electric dust removal device 5 is used for carrying out wet-type electric dust removal treatment on the gas obtained by the alkali liquor spraying treatment, and an ozone generating device 6 used for introducing ozone into the gas obtained by the alkali liquor spraying treatment is arranged at an inlet of the wet-type electric dust removal device;
and the adsorption device 7 is used for performing adsorption treatment on the gas obtained by wet electric dust removal treatment.
In the wet purification treatment system for blast furnace flue gas of steel plant provided by the invention, the atomization device generally refers to a treatment device capable of atomizing and dispersing liquid into gas, the first atomization device 2 can atomize liquid containing a flocculating agent and disperse the liquid into gas to be treated, and the second atomization device 4 can atomize liquid containing an oxidizing agent and disperse the liquid into gas obtained by water film dust removal treatment. The first atomization device 2 and/or the second atomization device 4 can be selected from one or more of a pressure atomizer and ultrasonic atomizer, the particle diameter of atomized liquid drops of the first atomization device 2 and/or the second atomization device 4 is 5-200 um, and the using amount of aerial fog is 1-100 ml/(m)3*min)。
In the wet purification treatment system for blast furnace flue gas of steel plant provided by the invention, the water film dust removal device 1 generally refers to a device capable of treating gas by a water film dust removal treatment method, and gas to be treated can be introduced into the water film dust removal device 1 so as to achieve the effect of water film dust removal treatment. The liquid-gas ratio of the water film dust removal device 1 is 0.1-0.6L/m3The water film dust removing device 1 may be one or a combination of more selected from an impact water film dust remover, an inert water film dust remover and a centrifugal water film dust remover.
In the wet-type purification treatment system for blast furnace flue gas of steel plant provided by the invention, the alkali liquor spraying device 3 can be used for spraying alkali liquor into gas SO as to utilize SO in flue gas after oxidation of alkali liquor3、NO2When the acid gas is absorbed by the device, the gas obtained by the water film dedusting treatment can be introduced into the alkali liquor spraying device 3, thereby achieving the effect of alkali liquor spraying treatment. The lye spraying devices can be, for example, spray towers or the like. The alkali liquor used in the alkali liquor spraying device 3 comprises NH4HCO3And/or (NH)4)2CO3The concentration of the alkali liquor is 0.1-5 mol/L. The liquid-gas ratio in the alkali liquor spraying device is 1.5-3L/m3Spraying density of 50-100m3/(m2*h)。
In the wet purification treatment system for blast furnace flue gas of steel plant provided by the invention, the ozone generator 6 can generate ozone gasAnd ozone gas can be introduced into the gas to be treated, and the gas obtained by the alkali liquor spraying treatment can be introduced into the ozone. The ozone generating device 6 can be an ozone generator, etc., and the ozone generating amount of the ozone generating device 6 can be 100-1500mg/m3。
In the wet purification treatment system for blast furnace flue gas of steel plant provided by the invention, the wet electric dust removal device 5 generally refers to a device which utilizes high-voltage corona discharge to charge dust, the charged dust is collected under the action of electric field force so as to remove dust in gas, and gas obtained by alkali liquor spraying treatment can be introduced into the wet electric dust removal device 5 so as to be subjected to wet electric dust removal treatment. The wet electric dust collector 5 can be selected from a cross-flow wet electric dust collector and/or a vertical-flow wet electric dust collector, etc.
In the wet purification treatment system for blast furnace flue gas of steel plant provided by the present invention, the adsorption device 7 may be capable of accommodating an adsorption medium, so as to adsorb gas by using the adsorption medium, for example, by using the adsorption capacity of a microporous medium, so as to make the gas meet the emission standard. The gas resulting from the wet electric dust removal treatment may be introduced into the adsorption device 7 to thereby perform the adsorption treatment. The adsorption treatment may be performed by adsorbing the gas with an adsorption medium to remove adsorbable substances in the gas, wherein the adsorption medium in the adsorption device 7 is selected from activated carbon and/or molecular sieves.
The wet purification treatment method and the wet purification treatment system for the blast furnace flue gas of the iron and steel plant provided by the invention can effectively reduce pollutants such as dust particles, oxysulfide, nitric oxide, carbon monoxide and the like in the blast furnace flue gas of the iron and steel plant through treatment methods such as flocculation, water film dust removal, oxidation, alkali liquor spraying, ozone mixing, wet electric dust removal, adsorption and the like, are reasonable and efficient post-treatment methods, and are suitable for industrial large-scale application.
Example 1
The blast furnace fume outlet is provided with atomizing equipment, and the fume parameter at the fume outlet is 20000Nm3Dust particles 1600 mg/Nm/h31000mg/Nm of sulfur dioxide3Nitric oxide 400mg/Nm31000mg/Nm of carbon monoxide3The remainder being mainly N2. Spraying flocculation liquid aerosol into the smoke, wherein the flocculating agent is polyaluminium chloride with the concentration of 350mg/L and the dosage of 0.1L/m3And then the flue gas enters an impact type granite water film dust remover, the rising wind speed of the tower body is 5.5m/s, and the circulating water amount is 2.4 t/h. An atomizing device is arranged at an outlet of the water film dust collector, oxidant aerosol is sprayed to outlet flue gas, the oxidant is a mixture of potassium permanganate and sodium hypochlorite according to a mass ratio of 1:2, the total concentration of oxidant solution is 0.5mol/L, and the dosage is 50 ml/(m)3Min), oxidizing and spraying the smoke gas to oxidize nitric oxide into nitrogen dioxide, and then feeding the smoke gas into an alkali liquor spray tower, wherein the alkali liquor is (NH)4)2CO3The concentration of the alkali liquor is 0.8mol/L, and the liquid-gas ratio in the alkali liquor spraying device is 1.5L/m3Spraying density of 50-100m3/(m2H), the empty tower flow rate is 4 m/s; an ozone generator is arranged at the outlet of the alkali liquor spray tower, ozone mist is sprayed into the flue gas, and the introduction amount of ozone is 500mg/m3Then, the flue gas enters a vertical flow type wet electric dust remover, the wind speed of an electric field is 0.4-1.5m/s, the retention time is 6-12s, the water consumption is 0.8t/h, and the power is 300 KW/h; the outlet flue gas of the wet electric precipitator finally enters an adsorption tower, an adsorber is made of active carbon, and the adsorption airspeed is 3500h-1The empty tower speed is 0.5m/s, the residence time is 2s, the standard discharge is achieved, finally, the dust particle removal efficiency can reach 99 percent, and the discharge concentration is 16 mg/Nm3(ii) a The sulfur dioxide removal efficiency is 98%, and the emission concentration is 20mg// Nm3(ii) a The removal efficiency of nitrogen oxides can reach 90 percent, and the emission concentration is 40mg/Nm3(ii) a The dust removal efficiency of the carbon monoxide is 95 percent, and the emission concentration is 50mg/Nm3All pollutants can reach the standard emission.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. A wet purification treatment method for blast furnace flue gas of a steel plant comprises the following steps:
1) introducing flocculating liquid into flue gas to be treated, and performing water film dust removal treatment, wherein the flocculating liquid is aerial fog of an aqueous solution of a flocculating agent, the flocculating agent is selected from an aluminum salt flocculating agent and/or an iron salt flocculating agent, the concentration of the flocculating agent is 1-500mg/L, the particle size of atomized liquid drops is 5-200 um, and the using amount of the aerial fog of the flocculating liquid is 1-100 ml/(m/L)3Min), the liquid-gas ratio of the water film dedusting treatment is 0.1-0.6L/m3；
2) Introducing an oxidizing solution into the obtained gas, and carrying out alkali liquor spraying treatment, wherein the oxidizing solution is aqueous solution aerosol of an oxidant, the oxidant is one or a mixture of more of potassium permanganate, potassium perchlorate, ammonium persulfate, sodium dichromate and sodium hypochlorite, the concentration of the oxidizing solution is 0.05-2mol/L, the particle size of atomized liquid drops is 5-200 um, and the using amount of the oxidizing solution aerosol is 1-100 ml/(m3Min), the liquid-gas ratio in the alkali liquor spraying treatment is 1.5-3L/m3Spraying density of 50-100m3/(m2H), the alkali liquor used in the alkali liquor spraying treatment comprises NH4HCO3And/or (NH)4)2CO3The concentration of the alkali liquor is 0.1-5 mol/L;
3) introducing ozone into the obtained gas, and performing wet electric precipitation treatment, wherein the introduction amount of the ozone in the gas is 100-1500mg/m3The wet electric dust removal treatment comprises cross-flow wet electric dust removal treatment and/or vertical-flow wet electric dust removal treatment, the wet electric dust remover adopts a plate-type or multi-layer screen plate-type anode and a fishbone needle-punched linear cathode, the electric field wind speed is 0.4-1.5m/s, the retention time is 6-12s, the water consumption is 0.2-10t/h, and the power is 100-400 KW/h;
4) carrying out adsorption treatment on the obtained gas;
in the blast furnace flue gas of the steel plant, the dust particles are 1600mg/Nm3Above, the sulfur dioxide content is 1000mg/Nm3Above, the content of nitric oxide is 400mg/Nm3Above, the carbon monoxide content is 1000mg/Nm3The above.
2. The wet purification treatment method for the blast furnace flue gas of the steel plant according to claim 1, wherein the water film dedusting treatment method is selected from one or more of impact water film treatment, inert water film treatment and centrifugal water film treatment.
3. The wet purification treatment method for the flue gas of the blast furnace of the steel plant according to claim 1, characterized by further comprising one or more of the following technical features:
D1) adopting active carbon and/or molecular sieve for adsorption treatment;
D2) the space velocity of the adsorption treatment is 2000-9000h-1The superficial velocity is 0.2-0.5m/s, and the retention time is 2-5 s.
4. A wet purification treatment system for blast furnace flue gas of a steel plant comprises:
a water film dust collector (1) for inciting somebody to action gas to be handled carries out water film dust removal processing, water film dust collector's entry is equipped with and is used for introducing first atomizing device (2) of flocculation liquid in handling the flue gas, the flocculation liquid is flocculation liquid air fog, and the liquid-to-gas ratio of water film dust collector (1) is 0.1-0.6L/m3；
An alkali liquor spraying device (3) for performing alkali liquor spraying treatment on the gas obtained by the water film dust removal treatment, wherein the inlet of the alkali liquor spraying device is provided with a second atomizing device (4) for introducing oxidizing liquid into the gas obtained by the water film dust removal treatment, the oxidizing liquid is oxidizing liquid aerosol, and the liquid-gas ratio in the alkali liquor spraying device (3) is 1.5-3L/m3Spraying density of 50-100m3/(m2*h)；
A wet-type electric dust removal device (5) for performing wet-type electric dust removal treatment on the gas obtained by the alkali liquor spraying treatment, wherein an ozone generating device (6) for introducing ozone into the gas obtained by the alkali liquor spraying treatment is arranged at an inlet of the wet-type electric dust removal device, and the ozone generating amount of the ozone generating device (6) is 100-1500 mg/m-3；
An adsorption device (7) for performing adsorption treatment on the gas obtained by wet electric dust removal treatment;
in the blast furnace flue gas of the steel plant, the dust particles are 1600mg/Nm3Above, the sulfur dioxide content is 1000mg/Nm3Above, the content of nitric oxide is 400mg/Nm3Above, the carbon monoxide content is 1000mg/Nm3The above.
5. The wet purification treatment system for the blast furnace flue gas of the steel plant according to claim 4, wherein the first atomization device (2) and/or the second atomization device (4) is selected from one or more of a pressure atomizer and an ultrasonic atomizer;
and/or the particle diameter of the atomized liquid drops of the first atomization device (2) and/or the second atomization device (4) is 5-200 um, and the using amount of the aerial fog is 1-100 ml/(m)3*min)。
6. The wet purification treatment system for blast furnace flue gas of steel plant according to claim 4,
the water film dust removal device (1) is selected from one or more of an impact water film dust remover, an inert water film dust remover and a centrifugal water film dust remover.
7. The wet purification treatment system for blast furnace flue gas of steel plant according to claim 4, wherein the alkali solution used in the alkali solution spraying device (3) comprises NH4HCO3And/or (NH)4)2CO3The concentration of the alkali liquor is 0.1-5 mol/L.
8. The wet purification treatment system for blast furnace flue gas of steel plant according to claim 4,
the wet electric dust removal device (5) comprises a cross-flow wet electric dust removal device and/or a vertical-flow wet electric dust removal device;
and/or the adsorption medium in the adsorption device (7) is selected from one or more of activated carbon and molecular sieve.
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