CN113559821A - Method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash - Google Patents
Method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash Download PDFInfo
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- CN113559821A CN113559821A CN202110828110.7A CN202110828110A CN113559821A CN 113559821 A CN113559821 A CN 113559821A CN 202110828110 A CN202110828110 A CN 202110828110A CN 113559821 A CN113559821 A CN 113559821A
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- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 239000010881 fly ash Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 36
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 239000003546 flue gas Substances 0.000 title claims abstract description 22
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 140
- 230000023556 desulfurization Effects 0.000 claims abstract description 133
- 238000001035 drying Methods 0.000 claims abstract description 76
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000012216 screening Methods 0.000 claims abstract description 48
- 238000003756 stirring Methods 0.000 claims abstract description 29
- 238000002156 mixing Methods 0.000 claims abstract description 24
- 239000012535 impurity Substances 0.000 claims abstract description 22
- 238000010008 shearing Methods 0.000 claims abstract description 22
- 238000000227 grinding Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000000465 moulding Methods 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 130
- 230000003009 desulfurizing effect Effects 0.000 claims description 28
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 23
- 239000011593 sulfur Substances 0.000 claims description 23
- 229910052717 sulfur Inorganic materials 0.000 claims description 23
- 239000008367 deionised water Substances 0.000 claims description 21
- 229910021641 deionized water Inorganic materials 0.000 claims description 21
- 238000001125 extrusion Methods 0.000 claims description 21
- 238000012856 packing Methods 0.000 claims description 20
- 238000003892 spreading Methods 0.000 claims description 13
- 239000000835 fiber Substances 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 7
- 238000001179 sorption measurement Methods 0.000 claims description 7
- 239000004575 stone Substances 0.000 claims description 7
- 238000000967 suction filtration Methods 0.000 claims description 7
- 239000002699 waste material Substances 0.000 abstract description 10
- 239000002912 waste gas Substances 0.000 abstract description 9
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 description 5
- 238000009740 moulding (composite fabrication) Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 238000004131 Bayer process Methods 0.000 description 1
- 229910021532 Calcite Inorganic materials 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 229910052595 hematite Inorganic materials 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010742 number 1 fuel oil Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
-
- 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
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28016—Particle form
- B01J20/28019—Spherical, ellipsoidal or cylindrical
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/112—Metals or metal compounds not provided for in B01D2253/104 or B01D2253/106
- B01D2253/1124—Metal 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
Abstract
The invention discloses a method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash, which comprises the following steps: removing impurities from red mud raw pulp; drying, grinding and screening; adding materials, mixing and stirring; extruding, shearing and molding; drying the sample; detecting the water content; the invention discloses a method for treating sulfur dioxide waste gas by using red mud, which has the advantages of simple process and small operation difficulty, prepares a desulfurization sample by mixing the red mud and fly ash as raw materials, realizes a method for treating sulfur dioxide by using the red mud piled up by means of 'treating waste by waste', realizes that the waste red mud piled up material is reused, reduces the cost for treating waste gas, can consume and utilize the waste red mud in the process of treating the waste gas, avoids the pollution of the waste red mud to the environment, and reduces the cost for treating the sulfur dioxide waste gas, so that the treatment method is more energy-saving and environment-friendly.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to a method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash.
Background
The red mud is solid waste residue discharged when the aluminum oxide is extracted in the aluminum industry, the red mud is called red mud because the red mud contains a large amount of iron oxide, and is usually red, the red mud can be divided into 3 types of Bayer process red mud, sintering process red mud and combination process red mud according to production methods, the output amount of the red mud is different according to ore grade, production methods and technical levels, most production plants produce 1.0-1.8 t of red mud when producing 1t of aluminum oxide, the red mud produced in the aluminum oxide industry worldwide is estimated to exceed 6 x 107t, the red mud mainly contains iron oxide, silicon dioxide, calcium oxide, aluminum oxide, sodium oxide, titanium dioxide and the like, and also contains a certain amount of rare earth elements and trace radioactive elements such as rhenium, gallium, yttrium and the like, and the mineral compositions mainly comprise boehmite, kaolinite, quartz, hematite, calcite and the like;
with the increasing of the quantity of red mud stockpiles, huge environmental risks are easily brought along with the increasing of the quantity of red mud stockpiles, and meanwhile, sulfur dioxide is mainly generated by burning sulfur-containing substances such as coal and fuel oil, so that a large amount of cost needs to be invested to inhibit the emission of sulfur dioxide gas to control the emission of sulfur dioxide pollutants, so that resource loss is caused, and therefore, the problem that how to solve the emission of sulfur dioxide gas by reducing the quantity of red mud stockpiles is needed to be solved urgently at present.
Disclosure of Invention
The invention provides a method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash, which can effectively solve the problems that the quantity of red mud stockpiled is continuously increased, huge environmental risks are easily brought along with the increase of the quantity of red mud stockpiled, and a large amount of cost needs to be invested to inhibit the discharge of sulfur dioxide gas to control the discharge of sulfur dioxide pollutants, so that resource loss is caused in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: the method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash comprises the following steps:
step 1: removing impurities from red mud raw pulp;
step 2: drying, grinding and screening;
and step 3: adding materials, mixing and stirring;
and 4, step 4: extruding, shearing and molding;
and 5: drying the sample;
step 6: detecting the water content;
and 7: and (4) removing sulfur from the sample.
According to the technical scheme, in the step 1, the red mud raw stock impurity removal means that the red mud raw stock is screened by a screening machine, the screening mesh of the screening machine is 16 meshes, stone and plant debris impurities in the red mud raw stock are screened, and the red mud cake is obtained through suction filtration treatment.
According to the technical scheme, in the step 2, the drying, grinding and screening means that the red mud cakes obtained in the step 1 are dried in a dryer at 105 ℃, the red mud cakes are ground and crushed by a grinder after being dried, and are screened by a screening machine again after being ground and crushed, and the screening specification is 60 meshes, so that the red mud samples are obtained for later use.
According to the technical scheme, in the step 3, the step of feeding, mixing and stirring refers to adding the obtained red mud sample and the fly ash into a mixer according to a proportion for mixing treatment, adding deionized water after the red mud sample and the fly ash are fully mixed, continuing to stir, adding the short fiber after adding the deionized water, and stirring until the red mud sample, the fly ash are stirred, and the deionized water and the short fiber are mixed into a viscous mud mass.
According to the technical scheme, in the step 4, the extrusion, shearing and molding means that after a red mud sample and the fly ash are fed and stirred to form a viscous mud mass, the mud mass is fed into an extrusion device, the mud mass is extruded by the extrusion device to form mud strips with the same thickness, and after the mud strips are extruded, the mud strips are sheared into small cylinders with the same length by a shearing device.
According to the technical scheme, in the step 5, the sample drying treatment refers to drying the small cylinder obtained in the step 4 by a dryer, wherein the drying temperature is controlled to be 80 ℃, the drying time is controlled to be 40min, and the desulfurization sample with the water content of 10% is obtained by drying treatment.
According to the technical scheme, in the step 6, the moisture content detection refers to detecting the moisture content of the dried desulfurization sample, and specifically refers to detecting the moisture content of the dried desulfurization sample according to different drying times of the small cylinders at different drying times.
According to the above technical scheme, in the step 7, the step of removing sulfur from the sample refers to removing sulfur from the dried sample to remove SO2And (4) carrying out desulfurization treatment on the gas.
According to the technical scheme, the desulfurization treatment specifically comprises the following steps:
s1, firstly, sending the dried desulfurization sample into a desulfurization tower, and flatly spreading the desulfurization sample on a packing layer in the desulfurization tower;
s2, adding SO2Gas is conveyed from bottom to top through a gas inlet at the bottom of the desulfurization tower, SO that SO is generated2The gas is finally discharged from an exhaust port at the top of the desulfurizing tower, SO2When the gas passes through the packing layer, the gas can be fully contacted with the desulfurization sample, and SO is treated by the desulfurization sample2Carrying out adsorption desulfurization treatment on the gas;
s3 at SO2The concentration of the gas was measured as N1 in SO as it entered the desulfurization tower from the gas inlet at the bottom of the tower2Measuring the concentration of the gas to be N2 when the gas is discharged from the desulfurizing tower through an exhaust port at the top of the desulfurizing tower, and counting SO2Calculating SO according to the concentration of the gas before and after desulfurization2Gas removal efficiency V, removal efficiency
S4, respectively spreading desulfurization samples with different water contents on a packing layer in the same desulfurization tower, and introducing SO with the same concentration2Gas, measuring the SO content of the desulfurized samples with different water contents2The removal efficiency of the gas.
According to the technical scheme, in the step S4, SO is measured in the desulfurization sample pairs with different water contents2When the gas is removed efficiently, the gas enters the desulfurizing tower to remove SO2The gas concentration is consistent, and the red mud with the same proportion is selectedSample and desulfurized sample made from fly ash.
Compared with the prior art, the invention has the beneficial effects that:
the invention develops a method for treating sulfur dioxide waste gas by using red mud, the process is simple, the operation difficulty is small, a desulfurization sample is prepared by mixing the red mud and fly ash as raw materials, the method for treating sulfur dioxide by using the red mud piled up is realized by means of 'treating waste by waste', the waste red mud piled up material is reused, the cost for treating waste gas is reduced, meanwhile, the waste red mud can be consumed and utilized in the process of treating waste gas, the pollution of the waste red mud to the environment is avoided, the cost for treating sulfur dioxide waste gas is reduced, the treatment method is more energy-saving and environment-friendly, the industrial requirement is met, and the red mud is reused, so that the effect of improving the properties of the red mud can be realized, and the red mud can be recovered;
when a desulfurization sample is prepared from the red mud and the fly ash, the proportion of the red mud to the fly ash, the drying time and the water content of the desulfurization sample are controlled in the preparation process, so that the red mud and the fly ash have higher sulfur dioxide removal efficiency when the desulfurization sample is subsequently prepared, the actual sulfur dioxide treatment effect can be effectively improved in the red mud and the fly ash with the same amount by changing the treatment mode of the raw materials and determining the optimal proportion, the red mud and the fly ash are conveniently and better utilized, and the desulfurization effect is more fully achieved in the actual sulfur removal process.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
In the drawings:
FIG. 1 is a flow chart of the steps of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1: as shown in fig. 1, the invention provides a technical scheme of a method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash, comprising the following steps:
step 1: removing impurities from red mud raw pulp;
step 2: drying, grinding and screening;
and step 3: adding materials, mixing and stirring;
and 4, step 4: extruding, shearing and molding;
and 5: drying the sample;
step 6: detecting the water content;
and 7: and (4) removing sulfur from the sample.
Based on the technical scheme, in the step 1, the red mud raw stock impurity removal means that the red mud raw stock is screened by a screening machine, the screening mesh of the screening machine is 16 meshes, stone and plant debris impurities in the red mud raw stock are screened, and the red mud cake is obtained through suction filtration treatment.
Based on the technical scheme, in the step 2, the drying, grinding and screening means that the red mud cakes obtained in the step 1 are dried in a dryer at 105 ℃, the red mud cakes are ground and crushed by a grinder after being dried, and are screened by a screening machine again after being ground and crushed, and the screening specification is 60 meshes, so that the red mud samples are obtained for later use.
Based on the technical scheme, in the step 3, the step of feeding, mixing and stirring refers to that the obtained red mud sample and the fly ash are mixed according to the weight ratio of the red mud: 9 parts of fly ash: the mixture is added into a mixer according to the proportion of 1 for mixing treatment, deionized water is added for continuous stirring after the red mud sample and the fly ash are fully mixed, chopped fibers are continuously added after the deionized water is added, and stirring is carried out until the red mud sample, the fly ash and the deionized water and the chopped fibers are mixed into a viscous mud mass.
Based on the technical scheme, in the step 4, the extrusion, shearing and forming means that after a red mud sample and the fly ash are fed and stirred to form a viscous mud mass, the mud mass is added into extrusion equipment, the mud mass is extruded by the extrusion equipment to form mud strips with the same thickness, and after the mud strips are extruded, the mud strips are sheared into small cylinders with the same length by the shearing equipment.
Based on the technical scheme, in the step 5, the sample drying treatment refers to drying the small cylinder obtained in the step 4 by a dryer, wherein the drying temperature is controlled to be 80 ℃, the drying time is controlled to be 20min, and the desulfurization sample with the water content of 15% is obtained by drying treatment.
Based on the above technical scheme, in step 6, the moisture content detection means detecting the moisture content of the dried desulfurization sample, and specifically means detecting the moisture content of the dried desulfurization sample according to different drying times of the small cylinders at different drying times.
Based on the technical scheme, in the step 7, the step of removing sulfur from the sample refers to removing sulfur from the dried sample to remove SO2And (4) carrying out desulfurization treatment on the gas.
Based on the technical scheme, the desulfurization treatment specifically comprises the following steps:
s1, firstly, sending the dried desulfurization sample into a desulfurization tower, and flatly spreading the desulfurization sample on a packing layer in the desulfurization tower;
s2, adding SO2Gas is conveyed from bottom to top through a gas inlet at the bottom of the desulfurization tower, SO that SO is generated2The gas is finally discharged from an exhaust port at the top of the desulfurizing tower, SO2When the gas passes through the packing layer, the gas can be fully contacted with the desulfurization sample, and SO is treated by the desulfurization sample2Carrying out adsorption desulfurization treatment on the gas;
s3 at SO2The concentration of the gas was measured as N1 in SO as it entered the desulfurization tower from the gas inlet at the bottom of the tower2Measuring the concentration of the gas to be N2 when the gas is discharged from the desulfurizing tower through an exhaust port at the top of the desulfurizing tower, and counting SO2Calculating SO according to the concentration of the gas before and after desulfurization2Gas removal efficiency V, removal efficiency
S4 filling desulfurization samples with different water contents in the same desulfurization towerIntroducing SO with the same concentration on the material layer2Gas, measuring the SO content of the desulfurized samples with different water contents2The removal efficiency of the gas.
Based on the technical scheme, in S4, SO is measured by desulfurization samples with different water contents2When the gas is removed efficiently, the gas enters the desulfurizing tower to remove SO2The gas concentrations are consistent, and the same proportion of the desulfurization sample prepared from the red mud sample and the fly ash is selected.
Example 2: as shown in fig. 1, the invention provides a technical scheme of a method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash, comprising the following steps:
step 1: removing impurities from red mud raw pulp;
step 2: drying, grinding and screening;
and step 3: adding materials, mixing and stirring;
and 4, step 4: extruding, shearing and molding;
and 5: drying the sample;
step 6: detecting the water content;
and 7: and (4) removing sulfur from the sample.
Based on the technical scheme, in the step 1, the red mud raw stock impurity removal means that the red mud raw stock is screened by a screening machine, the screening mesh of the screening machine is 16 meshes, stone and plant debris impurities in the red mud raw stock are screened, and the red mud cake is obtained through suction filtration treatment.
Based on the technical scheme, in the step 2, the drying, grinding and screening means that the red mud cakes obtained in the step 1 are dried in a dryer at 105 ℃, the red mud cakes are ground and crushed by a grinder after being dried, and are screened by a screening machine again after being ground and crushed, and the screening specification is 60 meshes, so that the red mud samples are obtained for later use.
Based on the technical scheme, in the step 3, the step of feeding, mixing and stirring refers to that the obtained red mud sample and the fly ash are mixed according to the weight ratio of the red mud: 8: 2, adding the red mud sample and the fly ash into a mixer for mixing treatment, adding deionized water for continuous stirring after the red mud sample and the fly ash are fully mixed, adding the short-cut fiber after the deionized water is added, and stirring until the red mud sample, the fly ash and the deionized water and the short-cut fiber are mixed into a viscous mud mass.
Based on the technical scheme, in the step 4, the extrusion, shearing and forming means that after a red mud sample and the fly ash are fed and stirred to form a viscous mud mass, the mud mass is added into extrusion equipment, the mud mass is extruded by the extrusion equipment to form mud strips with the same thickness, and after the mud strips are extruded, the mud strips are sheared into small cylinders with the same length by the shearing equipment.
Based on the technical scheme, in the step 5, the sample drying treatment refers to drying the small cylinder obtained in the step 4 by a dryer, wherein the drying temperature is controlled to be 80 ℃, the drying time is controlled to be 30min, and the desulfurization sample with the water content of 12% is obtained by drying treatment.
Based on the above technical scheme, in step 6, the moisture content detection means detecting the moisture content of the dried desulfurization sample, and specifically means detecting the moisture content of the dried desulfurization sample according to different drying times of the small cylinders at different drying times.
Based on the technical scheme, in the step 7, the step of removing sulfur from the sample refers to removing sulfur from the dried sample to remove SO2And (4) carrying out desulfurization treatment on the gas.
Based on the technical scheme, the desulfurization treatment specifically comprises the following steps:
s1, firstly, sending the dried desulfurization sample into a desulfurization tower, and flatly spreading the desulfurization sample on a packing layer in the desulfurization tower;
s2, adding SO2Gas is conveyed from bottom to top through a gas inlet at the bottom of the desulfurization tower, SO that SO is generated2The gas is finally discharged from an exhaust port at the top of the desulfurizing tower, SO2When the gas passes through the packing layer, the gas can be fully contacted with the desulfurization sample, and SO is treated by the desulfurization sample2Carrying out adsorption desulfurization treatment on the gas;
s3 at SO2The concentration of the gas was measured as N1 in SO as it entered the desulfurization tower from the gas inlet at the bottom of the tower2Measuring the concentration of the gas to be N2 when the gas is discharged from the desulfurizing tower through an exhaust port at the top of the desulfurizing tower, and counting SO2Calculating SO according to the concentration of the gas before and after desulfurization2Gas removal efficiency V, removal efficiency
S4, respectively spreading desulfurization samples with different water contents on a packing layer in the same desulfurization tower, and introducing SO with the same concentration2Gas, measuring the SO content of the desulfurized samples with different water contents2The removal efficiency of the gas.
Based on the technical scheme, in S4, SO is measured by desulfurization samples with different water contents2When the gas is removed efficiently, the gas enters the desulfurizing tower to remove SO2The gas concentrations are consistent, and the same proportion of the desulfurization sample prepared from the red mud sample and the fly ash is selected.
Example 3: as shown in fig. 1, the invention provides a technical scheme of a method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash, comprising the following steps:
step 1: removing impurities from red mud raw pulp;
step 2: drying, grinding and screening;
and step 3: adding materials, mixing and stirring;
and 4, step 4: extruding, shearing and molding;
and 5: drying the sample;
step 6: detecting the water content;
and 7: and (4) removing sulfur from the sample.
Based on the technical scheme, in the step 1, the red mud raw stock impurity removal means that the red mud raw stock is screened by a screening machine, the screening mesh of the screening machine is 16 meshes, stone and plant debris impurities in the red mud raw stock are screened, and the red mud cake is obtained through suction filtration treatment.
Based on the technical scheme, in the step 2, the drying, grinding and screening means that the red mud cakes obtained in the step 1 are dried in a dryer at 105 ℃, the red mud cakes are ground and crushed by a grinder after being dried, and are screened by a screening machine again after being ground and crushed, and the screening specification is 60 meshes, so that the red mud samples are obtained for later use.
Based on the technical scheme, in the step 3, the step of feeding, mixing and stirring refers to that the obtained red mud sample and the fly ash are mixed according to the weight ratio of the red mud: 7, coal ash: 3, adding the mixture into a mixer for mixing treatment, adding deionized water after the red mud sample and the fly ash are fully mixed, continuously stirring, continuously adding the short fiber after adding the deionized water, and stirring until the red mud sample, the fly ash and the deionized water are mixed into a viscous mud mass.
Based on the technical scheme, in the step 4, the extrusion, shearing and forming means that after a red mud sample and the fly ash are fed and stirred to form a viscous mud mass, the mud mass is added into extrusion equipment, the mud mass is extruded by the extrusion equipment to form mud strips with the same thickness, and after the mud strips are extruded, the mud strips are sheared into small cylinders with the same length by the shearing equipment.
Based on the technical scheme, in the step 5, the sample drying treatment refers to drying the small cylinder obtained in the step 4 by a dryer, wherein the drying temperature is controlled to be 80 ℃, the drying time is controlled to be 40min, and the desulfurization sample with the water content of 10% is obtained by drying treatment.
Based on the above technical scheme, in step 6, the moisture content detection means detecting the moisture content of the dried desulfurization sample, and specifically means detecting the moisture content of the dried desulfurization sample according to different drying times of the small cylinders at different drying times.
Based on the technical scheme, in the step 7, the step of removing sulfur from the sample refers to removing sulfur from the dried sample to remove SO2And (4) carrying out desulfurization treatment on the gas.
Based on the technical scheme, the desulfurization treatment specifically comprises the following steps:
s1, firstly, sending the dried desulfurization sample into a desulfurization tower, and flatly spreading the desulfurization sample on a packing layer in the desulfurization tower;
s2, adding SO2Gas is conveyed from bottom to top through a gas inlet at the bottom of the desulfurization tower, SO that SO is generated2The gas is finally discharged from an exhaust port at the top of the desulfurizing tower, SO2When gas passes through the packing layerWill be in full contact with the desulfurization sample, and the SO is reacted by the desulfurization sample2Carrying out adsorption desulfurization treatment on the gas;
s3 at SO2The concentration of the gas was measured as N1 in SO as it entered the desulfurization tower from the gas inlet at the bottom of the tower2Measuring the concentration of the gas to be N2 when the gas is discharged from the desulfurizing tower through an exhaust port at the top of the desulfurizing tower, and counting SO2Calculating SO according to the concentration of the gas before and after desulfurization2Gas removal efficiency V, removal efficiency
S4, respectively spreading desulfurization samples with different water contents on a packing layer in the same desulfurization tower, and introducing SO with the same concentration2Gas, measuring the SO content of the desulfurized samples with different water contents2The removal efficiency of the gas.
Based on the technical scheme, in S4, SO is measured by desulfurization samples with different water contents2When the gas is removed efficiently, the gas enters the desulfurizing tower to remove SO2The gas concentrations are consistent, and the same proportion of the desulfurization sample prepared from the red mud sample and the fly ash is selected.
Example 4: as shown in fig. 1, the invention provides a technical scheme of a method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash, comprising the following steps:
step 1: removing impurities from red mud raw pulp;
step 2: drying, grinding and screening;
and step 3: adding materials, mixing and stirring;
and 4, step 4: extruding, shearing and molding;
and 5: drying the sample;
step 6: detecting the water content;
and 7: and (4) removing sulfur from the sample.
Based on the technical scheme, in the step 1, the red mud raw stock impurity removal means that the red mud raw stock is screened by a screening machine, the screening mesh of the screening machine is 16 meshes, stone and plant debris impurities in the red mud raw stock are screened, and the red mud cake is obtained through suction filtration treatment.
Based on the technical scheme, in the step 2, the drying, grinding and screening means that the red mud cakes obtained in the step 1 are dried in a dryer at 105 ℃, the red mud cakes are ground and crushed by a grinder after being dried, and are screened by a screening machine again after being ground and crushed, and the screening specification is 60 meshes, so that the red mud samples are obtained for later use.
Based on the technical scheme, in the step 3, the step of feeding, mixing and stirring refers to that the obtained red mud sample and the fly ash are mixed according to the weight ratio of the red mud: 6: 4, adding the mixture into a mixer for mixing treatment, adding deionized water after the red mud sample and the fly ash are fully mixed, continuing to stir, adding the short-cut fiber after adding the deionized water, and stirring until the red mud sample, the fly ash and the deionized water are mixed into a viscous mud mass.
Based on the technical scheme, in the step 4, the extrusion, shearing and forming means that after a red mud sample and the fly ash are fed and stirred to form a viscous mud mass, the mud mass is added into extrusion equipment, the mud mass is extruded by the extrusion equipment to form mud strips with the same thickness, and after the mud strips are extruded, the mud strips are sheared into small cylinders with the same length by the shearing equipment.
Based on the technical scheme, in the step 5, the sample drying treatment refers to drying the small cylinder obtained in the step 4 by a dryer, wherein the drying temperature is controlled to be 80 ℃, the drying time is controlled to be 50min, and the desulfurization sample with the water content of 9% is obtained by drying treatment.
Based on the above technical scheme, in step 6, the moisture content detection means detecting the moisture content of the dried desulfurization sample, and specifically means detecting the moisture content of the dried desulfurization sample according to different drying times of the small cylinders at different drying times.
Based on the technical scheme, in the step 7, the step of removing sulfur from the sample refers to removing sulfur from the dried sample to remove SO2And (4) carrying out desulfurization treatment on the gas.
Based on the technical scheme, the desulfurization treatment specifically comprises the following steps:
s1, firstly, sending the dried desulfurization sample into a desulfurization tower, and flatly spreading the desulfurization sample on a packing layer in the desulfurization tower;
s2, adding SO2Gas is conveyed from bottom to top through a gas inlet at the bottom of the desulfurization tower, SO that SO is generated2The gas is finally discharged from an exhaust port at the top of the desulfurizing tower, SO2When the gas passes through the packing layer, the gas can be fully contacted with the desulfurization sample, and SO is treated by the desulfurization sample2Carrying out adsorption desulfurization treatment on the gas;
s3 at SO2The concentration of the gas was measured as N1 in SO as it entered the desulfurization tower from the gas inlet at the bottom of the tower2Measuring the concentration of the gas to be N2 when the gas is discharged from the desulfurizing tower through an exhaust port at the top of the desulfurizing tower, and counting SO2Calculating SO according to the concentration of the gas before and after desulfurization2Gas removal efficiency V, removal efficiency
S4, respectively spreading desulfurization samples with different water contents on a packing layer in the same desulfurization tower, and introducing SO with the same concentration2Gas, measuring the SO content of the desulfurized samples with different water contents2The removal efficiency of the gas.
Based on the technical scheme, in S4, SO is measured by desulfurization samples with different water contents2When the gas is removed efficiently, the gas enters the desulfurizing tower to remove SO2The gas concentrations are consistent, and the same proportion of the desulfurization sample prepared from the red mud sample and the fly ash is selected.
Example 5: as shown in fig. 1, the invention provides a technical scheme of a method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash, comprising the following steps:
step 1: removing impurities from red mud raw pulp;
step 2: drying, grinding and screening;
and step 3: adding materials, mixing and stirring;
and 4, step 4: extruding, shearing and molding;
and 5: drying the sample;
step 6: detecting the water content;
and 7: and (4) removing sulfur from the sample.
Based on the technical scheme, in the step 1, the red mud raw stock impurity removal means that the red mud raw stock is screened by a screening machine, the screening mesh of the screening machine is 16 meshes, stone and plant debris impurities in the red mud raw stock are screened, and the red mud cake is obtained through suction filtration treatment.
Based on the technical scheme, in the step 2, the drying, grinding and screening means that the red mud cakes obtained in the step 1 are dried in a dryer at 105 ℃, the red mud cakes are ground and crushed by a grinder after being dried, and are screened by a screening machine again after being ground and crushed, and the screening specification is 60 meshes, so that the red mud samples are obtained for later use.
Based on the technical scheme, in the step 3, the step of feeding, mixing and stirring refers to that the obtained red mud sample and the fly ash are mixed according to the weight ratio of the red mud: 5 of fly ash: 5, adding the mixture into a mixer for mixing treatment, adding deionized water after the red mud sample and the fly ash are fully mixed, continuing to stir, adding the short-cut fiber after adding the deionized water, and stirring until the red mud sample, the fly ash and the deionized water are mixed into a viscous mud mass.
Based on the technical scheme, in the step 4, the extrusion, shearing and forming means that after a red mud sample and the fly ash are fed and stirred to form a viscous mud mass, the mud mass is added into extrusion equipment, the mud mass is extruded by the extrusion equipment to form mud strips with the same thickness, and after the mud strips are extruded, the mud strips are sheared into small cylinders with the same length by the shearing equipment.
Based on the technical scheme, in the step 5, the sample drying treatment refers to drying the small cylinder obtained in the step 4 by a dryer, wherein the drying temperature is controlled to be 80 ℃, the drying time is controlled to be 60min, and the desulfurization sample with the water content of 6% is obtained by drying treatment.
Based on the above technical scheme, in step 6, the moisture content detection means detecting the moisture content of the dried desulfurization sample, and specifically means detecting the moisture content of the dried desulfurization sample according to different drying times of the small cylinders at different drying times.
Based on the technical scheme, in the step 7, the step of removing sulfur from the sample refers to removing sulfur from the dried sample to remove SO2And (4) carrying out desulfurization treatment on the gas.
Based on the technical scheme, the desulfurization treatment specifically comprises the following steps:
s1, firstly, sending the dried desulfurization sample into a desulfurization tower, and flatly spreading the desulfurization sample on a packing layer in the desulfurization tower;
s2, adding SO2Gas is conveyed from bottom to top through a gas inlet at the bottom of the desulfurization tower, SO that SO is generated2The gas is finally discharged from an exhaust port at the top of the desulfurizing tower, SO2When the gas passes through the packing layer, the gas can be fully contacted with the desulfurization sample, and SO is treated by the desulfurization sample2Carrying out adsorption desulfurization treatment on the gas;
s3 at SO2The concentration of the gas was measured as N1 in SO as it entered the desulfurization tower from the gas inlet at the bottom of the tower2Measuring the concentration of the gas to be N2 when the gas is discharged from the desulfurizing tower through an exhaust port at the top of the desulfurizing tower, and counting SO2Calculating SO according to the concentration of the gas before and after desulfurization2Gas removal efficiency V, removal efficiency
S4, respectively spreading desulfurization samples with different water contents on a packing layer in the same desulfurization tower, and introducing SO with the same concentration2Gas, measuring the SO content of the desulfurized samples with different water contents2The removal efficiency of the gas.
Based on the technical scheme, in S4, SO is measured by desulfurization samples with different water contents2When the gas is removed efficiently, the gas enters the desulfurizing tower to remove SO2The gas concentrations are consistent, and the same proportion of the desulfurization sample prepared from the red mud sample and the fly ash is selected.
By testing the proportion of the red mud sample and the fly ash, the drying time of the small cylinder and the moisture content of the desulfurization sample in examples 1 to 5, SO2The results of the gas removal efficiency are shown in the following table:
as can be seen from the above table, in the process of removing sulfur dioxide from flue gas by using the sample prepared from the red mud and the fly ash, the ratio of the red mud to the fly ash is controlled to be 7: when the sample is dried for 3 hours, the drying time of the sample is controlled to be 40min, and when the water content of the sample is 10%, the SO is added2The highest removal efficiency of gas reaches 98%, which indicates that when the desulfurization is realized based on the red mud and the fly ash, the optimal proportion of raw materials is controlled to be 7: 3 hours, 40min of drying time and 10 percent of water content can ensure that the desulfurized sample achieves the best removal effect.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash is characterized by comprising the following steps: the method comprises the following steps:
step 1: removing impurities from red mud raw pulp;
step 2: drying, grinding and screening;
and step 3: adding materials, mixing and stirring;
and 4, step 4: extruding, shearing and molding;
and 5: drying the sample;
step 6: detecting the water content;
and 7: and (4) removing sulfur from the sample.
2. The method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash according to claim 1, which is characterized in that: in the step 1, the red mud raw stock impurity removal means that the red mud raw stock is screened by a screening machine, the screen mesh of the screening machine is 16 meshes, stone and plant debris impurities in the red mud raw stock are screened, and the red mud cake is obtained through suction filtration treatment.
3. The method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash according to claim 2, which is characterized in that: in the step 2, the drying, grinding and screening means that the red mud cakes obtained in the step 1 are dried in a dryer at 105 ℃, the red mud cakes are ground and crushed by a grinder after being dried, and are sieved again by a screening machine after being ground and crushed, so that the red mud sample is screened out to be 40-100 meshes, and is ready for use.
4. The method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash according to claim 3, which is characterized in that: in the step 3, the step of feeding, mixing and stirring refers to adding the obtained red mud sample and the fly ash into a mixer according to different proportions for mixing treatment, adding deionized water after the red mud sample and the fly ash are fully mixed, continuing to stir, adding the short fiber after the deionized water is added, and stirring until the red mud sample, the fly ash and the deionized water and the short fiber are mixed into a viscous mud mass.
5. The method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash according to claim 4, which is characterized in that: in the step 4, the extrusion, shearing and molding means that after the red mud sample and the fly ash are fed and stirred to form a viscous mud mass, the mud mass is added into extrusion equipment, the mud mass is extruded by the extrusion equipment to form mud strips with the same thickness, and after the mud strips are extruded, the mud strips are sheared into small cylinders with the same length by shearing equipment.
6. The method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash according to claim 5, which is characterized in that: in the step 5, the sample drying treatment refers to drying the small cylinder obtained in the step 4 by a dryer, wherein the drying temperature is controlled to be 60-105 ℃, the drying time is controlled to be 20-60 min, and the desulfurization sample with the water content of 6-15% is obtained by drying treatment.
7. The method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash according to claim 6, which is characterized in that: in the step 6, the moisture content detection means detecting the moisture content of the dried desulfurization sample, and specifically means detecting the moisture content of the dried desulfurization sample according to different drying times of the small cylinders at different drying times.
8. The method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash according to claim 7, which is characterized in that: in the step 7, the step of removing sulfur from the sample refers to removing sulfur from the dried sample to remove SO2And (4) carrying out desulfurization treatment on the gas.
9. The method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash according to claim 8, which is characterized in that: the desulfurization treatment specifically comprises the following steps:
s1, firstly, sending the dried desulfurization sample into a desulfurization tower, and flatly spreading the desulfurization sample on a packing layer in the desulfurization tower;
s2, adding SO2Gas is conveyed from bottom to top through a gas inlet at the bottom of the desulfurization tower, SO that SO is generated2The gas is finally discharged from an exhaust port at the top of the desulfurizing tower, SO2When the gas passes through the packing layer, the gas can be fully contacted with the desulfurization sample, and SO is treated by the desulfurization sample2Carrying out adsorption desulfurization treatment on the gas;
s3 at SO2The concentration of the gas was measured as N1 in SO as it entered the desulfurization tower from the gas inlet at the bottom of the tower2Gas (es)The concentration of N2 was measured when the residue was discharged from the desulfurizing tower through the gas outlet at the top of the desulfurizing tower, and the SO was counted2Calculating SO according to the concentration of the gas before and after desulfurization2Gas removal efficiency V, removal efficiency
S4, respectively spreading desulfurization samples with different water contents on a packing layer in the same desulfurization tower, and introducing SO with the same concentration2Gas, measuring the SO content of the desulfurized samples with different water contents2The removal efficiency of the gas.
10. The method for removing sulfur dioxide in flue gas by adsorbing red mud and fly ash according to claim 9, which is characterized in that: in the step S4, measuring the desulfurization sample pairs SO with different water contents2When the gas is removed efficiently, the gas enters the desulfurizing tower to remove SO2The gas concentrations are consistent, and the same proportion of the desulfurization sample prepared from the red mud sample and the fly ash is selected.
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