CN113350997B - Method and system for removing sulfur dioxide from blast furnace ironmaking dust by wet method - Google Patents
Method and system for removing sulfur dioxide from blast furnace ironmaking dust by wet method Download PDFInfo
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- CN113350997B CN113350997B CN202110636746.1A CN202110636746A CN113350997B CN 113350997 B CN113350997 B CN 113350997B CN 202110636746 A CN202110636746 A CN 202110636746A CN 113350997 B CN113350997 B CN 113350997B
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- flue gas
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- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 239000000428 dust Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 46
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000003546 flue gas Substances 0.000 claims abstract description 51
- 238000010521 absorption reaction Methods 0.000 claims abstract description 36
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 30
- 230000023556 desulfurization Effects 0.000 claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 29
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 11
- 229910001428 transition metal ion Inorganic materials 0.000 abstract description 5
- 230000003197 catalytic effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 238000003723 Smelting Methods 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 43
- 239000007789 gas Substances 0.000 description 39
- 239000006096 absorbing agent Substances 0.000 description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 14
- 229910052760 oxygen Inorganic materials 0.000 description 14
- 239000001301 oxygen Substances 0.000 description 14
- 229910052757 nitrogen Inorganic materials 0.000 description 11
- 238000001035 drying Methods 0.000 description 7
- 238000000746 purification Methods 0.000 description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910001437 manganese ion Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Classifications
-
- 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
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/507—Sulfur oxides by treating the gases with other liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/602—Oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention provides a method and a system for removing sulfur dioxide from blast furnace ironmaking dust by a wet method, belonging to the technical field of wet desulfurization. The invention provides a method for removing sulfur dioxide from blast furnace ironmaking dust by a wet method, which comprises the following steps: mixing blast furnace ironmaking dust with water to obtain blast furnace ironmaking dust absorption liquid; the pH value of the blast furnace ironmaking dust absorption liquid is 5.10-6.23; introducing industrial flue gas into the blast furnace ironmaking dust absorption liquid for desulfurization; the temperature of the desulfurization is 25-55 ℃. The method provided by the invention is used for smelting iron dust slurry and SO in a blast furnace 2 The reaction generates sulfuric acid, the pH value of the slurry is reduced, and Fe dissolved from blast furnace ironmaking dust 3+ 、Mn 2+ The transition metal ions have catalytic oxidation effect, so that sulfur dioxide is generated into sulfuric acid, the removal rate of the sulfur dioxide is 100% below 55 ℃, the removal rate of the sulfur dioxide is high, the process is simple, the cost is low, and no secondary pollution is caused.
Description
Technical Field
The invention relates to the technical field of desulfurization, in particular to a method and a system for removing sulfur dioxide from blast furnace ironmaking dust by a wet method.
Background
Sulfur dioxide gas is commonly contained in tail gas discharged from ore smelting industry, sulfuric acid industry, coal-fired and oil-fired boilers and the like. The emission of sulfur dioxide not only affects the quality of air and endangers human health, but also is a direct cause of acid rain formation. Acid rain also has a great hazard to humans, it will affect ecological balance, causing lake acidification to destroy aquatic life living environment, trees and crops to die, and building to suffer corrosion. Therefore, desulfurization of industrial flue gas to control and reduce sulfur dioxide emissions from the atmosphere is a general concern.
Zinc-containing blast furnace dust for removing SO in coal-fired flue gas 2 "(see Yang Xuemin, guo Zhancheng, xie Yusheng, new well Ji Nan. Zinc-containing blast furnace dust removes SO from coal flue gas 2 [J]Chemical metallurgy, 2000 (04): 438-442.) discloses a method for removing SO from coal-fired flue gas by utilizing zinc-containing blast furnace dust 2 In the range of 523-823K, the method can remove 87-93% SO in flue gas by utilizing zinc-containing blast furnace dust 2 . However, the SO is removed 2 The process of (2) is carried out under high temperature conditions and SO 2 The removal rate of the catalyst is low.
Disclosure of Invention
In view of the above, the invention aims to provide a method and a system for removing sulfur dioxide from blast furnace ironmaking dust by a wet method, and the method provided by the invention can be used for efficiently removing sulfur dioxide under a low-temperature condition.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for removing sulfur dioxide from blast furnace ironmaking dust by a wet method, which comprises the following steps:
mixing blast furnace ironmaking dust with water to obtain blast furnace ironmaking dust absorption liquid; the pH value of the blast furnace ironmaking dust absorption liquid is 5.10-6.23;
introducing industrial flue gas into the blast furnace ironmaking dust absorption liquid for desulfurization; the temperature of the desulfurization is 25-55 ℃.
Preferably, the ratio of the mass of the blast furnace ironmaking dust to the volume of water is (0.5-2.5) g:1L.
Preferably, the chemical composition of the blast furnace ironmaking dust in the blast furnace ironmaking dust absorption slurry comprises the following components in percentage by mass: fe (Fe) 2 O 3 10～35％、ZnO 5～25％、C 5～20％，CaO 0～5％、K 2 O 0～5％、SiO 2 0～10％、MnO 1～5％。
Preferably, SO in the industrial flue gas 2 The concentration of (C) is 1500-2500 mg/m 3 。
Preferably, O in the industrial flue gas 2 The volume fraction of (2) is 0-15%.
Preferably, the flow rate of the industrial flue gas is 0.3-0.6L/min.
Preferably, the desulfurization is performed under stirring conditions, and the stirring speed is 500-1000 rpm.
The invention provides a system for removing sulfur dioxide from blast furnace ironmaking dust by a wet method, which comprises an absorber 1, a heater 2 arranged on the outer side of the absorber 1, and a tail gas purifying device 5 communicated with a gas outlet of the absorber 1.
Preferably, the air conditioner further comprises a dryer 3, wherein the dryer 3 is communicated with the air outlet of the absorber 1.
Preferably, the device further comprises a flue gas analyzer 4, wherein the flue gas analyzer 4 is respectively communicated with the air outlet of the dryer 3 and the air inlet of the tail gas purifying device 5.
The invention provides a method for removing sulfur dioxide from blast furnace ironmaking dust by a wet method, which comprises the following steps: mixing blast furnace ironmaking dust with water to obtain blast furnace ironmaking dust absorption liquid; introducing industrial flue gas into the blast furnace ironmaking dust absorption liquid for desulfurization; by a means ofThe pH value of the blast furnace ironmaking dust absorption liquid is 5.10-6.23. The method provided by the invention, SO 2 After being dissolved in the blast furnace ironmaking dust absorption liquid, SO is produced 3 2 -, then oxidized by oxygen to sulfuric acid (SO 4 2 (-), and further the pH of the blast furnace ironmaking dust slurry is reduced, fe under acidic conditions 3+ 、Mn 2+ The transition metal ions dissolve out from blast furnace ironmaking dust and are added into Fe 3+ 、Mn 2+ The sulfur dioxide is catalyzed and oxidized by the transition metal ions to generate sulfuric acid, the desulfurization effect is good, and the removal rate of the sulfur dioxide is 100 percent below 55 ℃; the method provided by the invention has simple process, the blast furnace ironmaking dust is simple, convenient and easy to obtain, and SO is absorbed by the blast furnace ironmaking dust 2 The method can achieve the purpose of treating waste with waste, has low cost, no secondary pollution, higher economic and environmental benefits and can realize industrialized removal of sulfur dioxide.
The invention provides a system for removing sulfur dioxide from blast furnace ironmaking dust by a wet method, which comprises an absorber 1, a heater 2 arranged on the outer side of the absorber 1, and a tail gas purifying device 5 communicated with a gas outlet of the absorber 1. The system provided by the invention is simple, has low cost, and can realize continuous and efficient removal of sulfur dioxide in industrial flue gas.
Drawings
FIG. 1 is a schematic diagram of a system for removing sulfur dioxide from blast furnace ironmaking dust by a wet method, wherein 1 is an absorber, 2 is a heater, 3 is a dryer, 4 is a flue gas analyzer, 4-1 is a valve, 5 is a tail gas purifying device, and 5-1 is K 2 MnO 4 The solution purifying device is 5-2 NaOH solution purifying device;
FIG. 2 is a schematic diagram of a system for wet removal of sulfur dioxide from simulated flue gas from blast furnace dust in an embodiment, wherein 1 is an absorber, 2 is a heater, 3 is a dryer, 4 is a flue gas analyzer, 4-1 is a valve, 5 is a tail gas purifying device, and 5-1 is K 2 MnO 4 The solution purifying device is 5-2 NaOH solution purifying device, 6 is simulated flue gas device, 6-1 nitrogen cylinder, 6-2 oxygen cylinder, 6-3 sulfur dioxide cylinder, 6-4 first mass flow controller, 6-5 second mass flow controller and 6-6 first mass flow controllerThree mass flow controllers, 7 are mixers.
Detailed Description
The invention provides a method for removing sulfur dioxide from blast furnace ironmaking dust by a wet method, which comprises the following steps:
mixing blast furnace ironmaking dust with water to obtain blast furnace ironmaking dust absorption liquid; the pH value of the blast furnace ironmaking dust absorption liquid is 5.10-6.23;
introducing industrial flue gas into the blast furnace ironmaking dust absorption liquid for desulfurization; the temperature of the desulfurization is 25-55 ℃.
In the present invention, all raw material components are commercially available products well known to those skilled in the art unless specified otherwise.
The invention mixes blast furnace ironmaking dust with water to obtain blast furnace ironmaking dust absorption liquid.
In the invention, the chemical composition of the blast furnace ironmaking dust preferably comprises the following components in percentage by mass 2 O 3 10～35％、ZnO 5～25％、C 5～20％，CaO 0～5％、K 2 O 0～5％、SiO 2 0 to 10%, mnO 0 to 5%, more preferably Fe 2 O 3 15～30％、ZnO 10～20％、C 10～18％，CaO 1～4％、K 2 O 1～4％、SiO 2 2 to 8 percent, mnO 1 to 4 percent, most preferably Fe 2 O 3 20～25％、ZnO 15～20％、C 14～15％，CaO 2～3％、K 2 O 2～3％、SiO 2 4-6% of MnO 1-3%. The source of the blast furnace ironmaking dust is not particularly limited, and the composition meets the requirements.
In the present invention, the ratio of the mass of the blast furnace ironmaking dust to the volume of water is preferably (0.5 to 2.5) g:1L, more preferably (1 to 2.3) g:1L, most preferably (1.5-2) g:1L; the pH value of the blast furnace ironmaking dust absorption liquid is 5.10-6.23, preferably 5.3-6.0, and more preferably 5.5-5.8.
After the blast furnace ironmaking dust absorption liquid is obtained, industrial flue gas is introduced into the blast furnace ironmaking dust absorption liquid for desulfurization.
The invention relates to the industrial cigaretteThe gas is not particularly limited, and may contain sulfur dioxide. In an embodiment of the invention, the industrial flue gas is preferably a simulated flue gas, which preferably comprises nitrogen, oxygen and sulfur dioxide. In the present invention, SO in the industrial flue gas 2 The concentration of (C) is preferably 1500-2500 mg/m 3 More preferably 1800 to 2200mg/m 3 Most preferably 2000 to 2100mg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the O in the industrial flue gas 2 The volume fraction of (2) is preferably 0 to 15%, more preferably 2 to 12%, most preferably 5 to 10%; the flow rate of the industrial flue gas is preferably 0.3 to 0.6L/min, more preferably 0.4 to 0.5L/min.
In the present invention, the desulfurization temperature is 25 to 55 ℃, preferably 30 to 50 ℃, more preferably 35 to 45 ℃, and most preferably 40 to 45 ℃; the desulfurization is preferably performed under stirring conditions, and the stirring speed is preferably 500 to 1000rpm, more preferably 600 to 900rpm, and most preferably 700 to 800rpm.
In the invention, in the desulfurization process, the blast furnace ironmaking dust slurry and SO 2 Sulfuric acid is generated by the reaction, and then the pH value of the blast furnace ironmaking dust slurry is reduced, and Fe is contained in the slurry under the acidic condition 3+ 、Mn 2+ The transition metal ions dissolve out from blast furnace ironmaking dust and are added into Fe 3+ 、Mn 2+ The catalytic oxidation of the transition metal ions generates sulfuric acid by sulfur dioxide, so that the desulfurization effect is further promoted, and the main reactions in the desulfurization process are as follows:
(1) Hydration of blast furnace ironmaking dust:
CaO+H 2 O→Ca 2+ +2OH -
K 2 O+H 2 O→2K + +2OH -
(2)O 2 is dissolved in H 2 SO 3 Is to be used for ionization:
(3) Acid-base neutralization reaction is carried out in blast furnace ironmaking dust slurry:
H + +OH - ＝H 2 O
(4) Oxide and SO in blast furnace ironmaking slurry 2 The reaction:
(5) Catalytic oxidation of iron and manganese ions to absorb SO 2 The reaction:
after the desulfurization, the method preferably further comprises the steps of sequentially drying the desulfurized tail gas, detecting the concentration of the sulfur dioxide and absorbing the tail gas; the drying is preferably calcium chloride drying; the concentration of the sulfur dioxide is preferably detected by a flue gas analyzer; the tail gas absorption is preferablyComprising the utilization K performed in sequence 2 MnO 4 Tail gas absorption is carried out by using a solution and NaOH solution, wherein K is 2 MnO 4 The concentration of the solution is preferably 0.06 to 0.3mol/L, more preferably 0.1 to 0.25mol/L, and most preferably 0.15 to 0.2mol/L; the concentration of the NaOH solution is preferably 0.4 to 2.5mol/L, more preferably 0.5 to 2mol/L, and most preferably 1 to 1.5mol/L.
The invention also provides a system for removing sulfur dioxide from blast furnace ironmaking dust by a wet method, which comprises an absorber 1, a heater 2 arranged on the outer side of the absorber 1, and a tail gas purifying device 5 communicated with the gas outlet of the absorber 1.
The system provided by the invention comprises an absorber 1, wherein the absorber 1 is provided with an industrial flue gas inlet and an industrial flue gas outlet; the absorber is preferably internally provided with blast furnace ironmaking dust absorption liquid; the blast furnace ironmaking dust absorption liquid is preferably the same as the blast furnace ironmaking dust absorption liquid in the technical scheme of the method, and is not repeated here.
The system provided by the invention further comprises a heater 2 arranged outside the absorber 1; the heater 2 is used for heating the absorber 1. In the embodiment of the present invention, the heater 2 is preferably a water bath.
The system provided by the invention further comprises an exhaust gas purifying device 5 communicated with the gas outlet of the absorber. In the present invention, the exhaust gas purifying device 5 includes K 2 MnO 4 A solution purifying device 5-1 and a NaOH solution purifying device 5-2; the K is 2 MnO 4 The solution purifying device 5-1 is provided with an air inlet and an air outlet, and the air inlet is communicated with the air outlet of the absorber 1; the K is 2 MnO 4 K is contained in the solution purifying device 5-1 2 MnO 4 A solution. In the present invention, the NaOH solution purification apparatus 5-2 is provided with an air inlet and an air outlet, the air inlet and the K 2 MnO 4 The air outlet of the solution purifying device 5-1 is communicated; naOH solution is contained in the NaOH solution purifying device 5-2. In the present invention, the K 2 MnO 4 The concentration of the solution and NaOH solution is preferably the same as K in the process solution described above 2 MnO 4 The concentration of the solution is the same as that of the NaOH solution and will not be described in detail herein.
The system provided by the invention preferably further comprises a dryer 3, wherein the dryer 3 is provided with an air inlet and an air outlet, and the air inlet is communicated with the air outlet of the absorber 1; the dryer is used for drying the tail gas discharged from the gas outlet of the absorber 1.
The system provided by the invention preferably further comprises a flue gas analyzer 4, wherein the flue gas analyzer 4 is provided with an inlet and an outlet, and the inlet and the outlet are respectively connected with the air outlet of the dryer 3 and the K 2 MnO 4 The air inlet of the solution purifying device 5-1 is communicated; the flue gas analyzer 4 is communicated with the dryer 3 through a first pipeline, a valve 4-1 is arranged on the first pipeline, and when the concentration of sulfur dioxide in the dried tail gas is less than 100mg/m 3 And when the valve 4-1 is closed, the dried tail gas is directly conveyed to the tail gas purifying device 5 to absorb residual sulfur dioxide in the tail gas.
In the embodiment of the invention, the industrial flue gas is preferably simulated flue gas, the device for removing sulfur dioxide in the simulated flue gas by using the blast furnace ironmaking dust wet method is shown in fig. 2, wherein 1 is an absorber, 2 is a heater, 3 is a dryer, 4 is a flue gas analyzer, 4-1 is a valve, 5 is a tail gas purifying device, and 5-1 is K 2 MnO 4 The solution purifying device is 5-2 NaOH solution purifying device, 6 is simulated flue gas device, 6-1 is nitrogen cylinder, 6-2 is oxygen cylinder, 6-3 is sulfur dioxide cylinder, 6-4 is first mass flow controller, 6-5 is two mass flow controllers, 6-6 is third mass flow controller, and 7 is mixer. In the present invention, absorber 1, heater 2,3 dryer 3, flue gas analyzer 4, valve 4-1, exhaust gas purifying device 5,K 2 MnO 4 The solution purifying device 5-1 and the NaOH solution purifying device 5-2 are the same as the system for wet removal of sulfur dioxide from blast furnace ironmaking dust in the above technical solution, and will not be described in detail here.
In an embodiment of the invention, the system preferably further comprises a simulated flue gas device 6, the simulated flue gas device 6 comprising a nitrogen cylinder 6-1, an oxygen cylinder 6-2 and a sulfur dioxide cylinder 6-3; the gas outlet of the nitrogen bottle 6-1, the gas outlet of the oxygen bottle 6-2 and the gas outlet of the sulfur dioxide bottle 6-3 are respectively communicated with the absorber 1 through a second pipeline, a third pipeline and a fourth pipeline; the second pipeline is provided with a first mass flow controller 6-4 for controlling the amount of nitrogen; a second mass flow controller 6-5 is arranged on the third pipeline and is used for controlling the amount of oxygen; and a third mass flow controller 6-6 is arranged on the fourth pipeline and is used for controlling the amount of sulfur dioxide.
In an embodiment of the present invention, the system preferably further comprises a mixer 7, wherein the mixer 7 is provided with an air inlet and an air outlet, the air inlet is respectively communicated with the air outlet of the nitrogen cylinder 6-1, the air outlet of the oxygen cylinder 6-2 and the air outlet of the sulfur dioxide cylinder 6-3, and the air outlet is communicated with the air inlet of the absorber 1; the mixer 7 is used for uniformly mixing nitrogen, oxygen and sulfur dioxide.
The following specifically describes a method for removing sulfur dioxide by adopting the device for removing sulfur dioxide by a blast furnace ironmaking dust wet method according to the invention with reference to fig. 1, which comprises the following steps: the absorber 1 containing the blast furnace ironmaking dust absorption liquid is heated by the heater 2, then the industrial flue gas is led into the absorber 1 for desulfurization treatment, the obtained tail gas is conveyed into the dryer 3 for drying, and the tail gas is sequentially conveyed to K after being detected by the flue gas analyzer 2 MnO 4 Tail gas absorption is performed in the solution purification device 5-1 and the NaOH solution purification device 5-2.
The following specifically describes a method for removing sulfur dioxide by adopting the device for removing sulfur dioxide by a blast furnace ironmaking dust wet method according to the invention with reference to fig. 2, which comprises the following steps: heating an absorber 1 filled with blast furnace ironmaking dust absorption liquid by using a heater 2; the nitrogen gas provided by the nitrogen bottle 6-1 and metered by the first mass flow controller 6-4, the oxygen gas provided by the oxygen bottle 6-2 and metered by the second mass flow controller 6-5 and the sulfur dioxide provided by the sulfur dioxide bottle 6-3 and metered by the third mass flow controller 6-6 are mixed by the mixer 7 to obtain simulated flue gas; introducing the simulated flue gas into an absorber 1 for desulfurization treatment, conveying the obtained tail gas into a dryer 3 for drying, detecting by a flue gas analyzer, and sequentially conveying the tail gas to K 2 MnO 4 Tail gas absorption is performed in the solution purification device 5-1 and the NaOH solution purification device 5-2.
The technical solutions of the present invention will be clearly and completely described in the following in connection with the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Using the apparatus shown in fig. 2, mixing 0.5g blast furnace iron-making dust with 300mL distilled water to prepare blast furnace iron-making dust absorption liquid, and placing the blast furnace iron-making dust absorption liquid in an absorber 1; heating the blast furnace ironmaking dust absorption liquid in the absorber 1 to 35 ℃ by utilizing the constant-temperature water bath 2; wherein, the blast furnace ironmaking dust comprises the following components in percentage by mass: fe (Fe) 2 O 3 10～35％、ZnO 5～25％、C 5～20％，CaO 0～5％、K 2 O 0～5％、SiO 2 0～10％、MnO 1～5％；
The nitrogen gas provided by the nitrogen bottle 6-1 and metered by the first mass flow controller 6-4, the oxygen gas provided by the oxygen bottle 6-2 and metered by the second mass flow controller 6-5 and the sulfur dioxide provided by the sulfur dioxide bottle 6-3 and metered by the third mass flow controller 6-6 are mixed by the mixer 7 to obtain simulated flue gas; wherein the oxygen volume fraction is 5%, SO 2 Is 2500mg/m 3 ；
Introducing the simulated flue gas into an absorber 1 at a speed of 0.3L/min, desulfurizing at 35deg.C and 600rpm for 600min, drying the obtained tail gas in a dryer 3, and detecting SO in the dried tail gas every 20min with a flue gas analyzer 2 After the reaction, guan Bi nitrogen cylinder 6-1, oxygen cylinder 6-2 and sulfur dioxide cylinder 6-3 are sequentially conveyed to K 2 MnO 4 Tail gas absorption is carried out in the solution purifying device 5-1 and the NaOH solution purifying device 5-2, the pH value of the blast furnace ironmaking dust absorbing solution after desulfurization is measured, and SO is measured 2 And (5) calculating the concentration and the desulfurization rate.
Results: the initial pH value of the blast furnace ironmaking dust absorption liquid is 6.23, the pH value after desulfurization is 1.6, and the duration time of 100 percent of desulfurization rate is 240min.
Example 2
Sulfur dioxide removal was performed as in example 1, with the difference from example 1 that the volume fraction of oxygen in the simulated flue gas was 15% and the duration of 100% desulfurization was 600min.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (1)
1. A method for removing sulfur dioxide from blast furnace ironmaking dust by a wet method comprises the following steps:
mixing blast furnace ironmaking dust with water to obtain blast furnace ironmaking dust absorption liquid; the pH value of the blast furnace ironmaking dust absorption liquid is 6.23; in the desulfurization process, blast furnace ironmaking dust slurry and SO 2 Sulfuric acid is generated by the reaction, and the pH value of the blast furnace ironmaking dust slurry is reduced;
introducing industrial flue gas into the blast furnace ironmaking dust absorption liquid for desulfurization; the temperature of the desulfurization is 25-45 ℃;
the chemical composition of the blast furnace ironmaking dust in the blast furnace ironmaking dust absorption slurry comprises the following components in percentage by mass: fe (Fe) 2 O 3 10~35%、ZnO 5~25%、C 5~20%，CaO 0~5%、K 2 O 0~5%、SiO 2 0~10%、MnO 1~5%；
SO in the industrial flue gas 2 The concentration of the water is 1500-2500 mg/m 3 ，O 2 The volume fraction of (2) is 10-15%;
the ratio of the mass of the blast furnace ironmaking dust to the volume of water is (0.5-2.5) g:1L;
the flow rate of the industrial flue gas is 0.3-0.6L/min;
the desulfurization is carried out under the stirring condition, and the stirring speed is 500-1000 rpm.
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| NL2032090B1 (en) | 2023-05-19 |
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