CN114904377A - Desulfurizing agent and preparation method and application thereof - Google Patents
Desulfurizing agent and preparation method and application thereof Download PDFInfo
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- CN114904377A CN114904377A CN202210360533.5A CN202210360533A CN114904377A CN 114904377 A CN114904377 A CN 114904377A CN 202210360533 A CN202210360533 A CN 202210360533A CN 114904377 A CN114904377 A CN 114904377A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 230000003009 desulfurizing effect Effects 0.000 title claims description 31
- 239000000843 powder Substances 0.000 claims abstract description 70
- 239000010881 fly ash Substances 0.000 claims abstract description 55
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 47
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 47
- 239000004571 lime Substances 0.000 claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 239000002893 slag Substances 0.000 claims abstract description 44
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 35
- 230000023556 desulfurization Effects 0.000 claims abstract description 35
- 239000003245 coal Substances 0.000 claims abstract description 32
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 24
- 238000002485 combustion reaction Methods 0.000 claims abstract description 12
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 12
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims description 41
- 239000003795 chemical substances by application Substances 0.000 claims description 30
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 24
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 18
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 18
- 238000004321 preservation Methods 0.000 claims description 18
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 17
- 239000004575 stone Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 230000003321 amplification Effects 0.000 abstract description 2
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 28
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 14
- 239000011593 sulfur Substances 0.000 description 14
- 229910052717 sulfur Inorganic materials 0.000 description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 11
- 235000019738 Limestone Nutrition 0.000 description 11
- 239000003546 flue gas Substances 0.000 description 11
- 239000006028 limestone Substances 0.000 description 11
- 238000007873 sieving Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 238000000227 grinding Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 3
- 150000003568 thioethers Chemical class 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 150000007530 organic bases Chemical class 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002912 waste gas 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
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- 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
- B01D53/86—Catalytic processes
- B01D53/8603—Removing sulfur compounds
- B01D53/8609—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- 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)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a desulfurizer and a preparation method and application thereof, wherein the desulfurizer comprises modified lime powder, modified molten steel slag, modified fly ash and sodium bicarbonate. Particularly, the desulfurizer provided by the invention can be applied to realize desulfurization treatment during coal combustion, greatly saves production cost for enterprises consuming a large amount of coal and is beneficial to industrial amplification.
Description
Technical Field
The invention relates to the technical field of air pollution treatment, in particular to a desulfurizer and a preparation method and application thereof.
Background
The flue gas generated in coal combustion or industrial manufacturing often contains sulfide, the sulfide is mainly derived from coal or petroleum and sulfur substances contained in industrial raw materials prepared from the coal or petroleum, and the sulfur substances are reacted in the combustion process or the industrial manufacturing process and converted into sulfide to be released. Sulfides, particularly hydrogen sulfide, sulfur dioxide and the like, can often cause catalyst poisoning and inactivation in a production process, waste gas containing the sulfides is directly discharged, the environment is easily polluted, air problems such as haze and the like are generated, in addition, the sulfides in the flue gas are also main substances for forming acid rain, and the acid rain not only seriously corrodes buildings and public facilities, but also destroys forests and crops in large areas, and seriously affects the health and property safety of human beings.
Coal is a main energy source in our country, has wide application fields, and is industrially used for power plant power generation, industrial boiler heat energy combustion and the like. 80% of coal in China is directly used for combustion, and the coal usually contains sulfur in different degrees, particularly the sulfur content of low-grade coal is the highest. At present, in order to reduce the production cost, most enterprises use a plurality of inferior coals and coal gangues with higher sulfur content. Therefore, the pollution situation of sulfur dioxide is more severe, and the desulfurization problem of smoke causes high attention of all circles. Sulfur dioxide is listed as a main regulation and control of air pollutants in China, and the concentration level of sulfur dioxide in the atmosphere is used as an important index for evaluating the air quality. The control of sulfur dioxide production, i.e., desulfurization, in various fields is an extremely difficult task to overcome. The desulfurization after combustion, also called Flue gas desulfurization (FGD for short), is a process for removing sulfur and compounds in Flue gas, and in the FGD technology, the desulfurization is divided into the following five methods according to the type of the desulfurizing agent: the calcium method based on CaCO3 (limestone), the magnesium method based on MgO, the sodium method based on Na2SO3, the ammonia method based on NH3, the organic base method based on organic bases.
The current power plants, steel plants and cement plants modify the flue gas desulfurization system to the standard of ultra-low emission (35 mg/m) because of the requirements of national environmental protection policy 3 Below), that is, sulfur dioxide discharged to the atmosphere should reach 35mg/m regardless of the sulfur feeding amount of the flue gas desulfurization system 3 The method comprises the following steps that after the current ultralow emission modification, equipment runs for many years, a desulfurization equipment system continuously appears old, the running efficiency of the system is poor, related equipment has the problems of corrosion or faults and the like, the sulfur content of power plant coal changes too much, sometimes, the sulfur feed amount of a flue gas desulfurization system suddenly exceeds the standard, and therefore, the current wet desulfurization system cannot meet the current actual desulfurization running requirementThe requirement of adding a spray layer is met, so that the problem of poor efficiency of a desulfurization system is solved by applying a novel desulfurization optimization scheme on the premise of the operation of the existing wet desulfurization.
Based on the problems, the invention provides the desulfurizer for realizing desulfurization during coal combustion, which can effectively and easily remove sulfur dioxide which subsequently enters the flue gas desulfurization tower by pre-removing sulfur in the coal combustion process, not only can solve the pressure of desulfurization treatment of the subsequent desulfurization tower caused by unstable sulfur content of power plant coal, but also can further reduce the related cost of desulfurization.
Disclosure of Invention
The invention aims to provide a desulfurizing agent for realizing desulfurization in coal combustion, which can greatly save the production cost for enterprises consuming a large amount of coal. Meanwhile, the desulfurizer of the invention fully utilizes the characteristics of industrial waste residue, namely fly ash and molten steel slag, treats waste by waste, has low desulfurization cost and high sulfur dioxide removal rate, and is beneficial to industrial amplification. In addition, the desulfurizer is particularly suitable for desulfurization treatment in the environment of temperature of 100-400 ℃.
The invention also aims to provide a preparation method of the desulfurizer.
The invention further aims to provide application of the desulfurizer.
In order to achieve the above object, the present invention provides a desulfurizing agent comprising: modified lime powder, modified molten steel slag, modified fly ash and sodium bicarbonate.
Further, the desulfurizer comprises 40-70% of modified lime powder, 10-20% of modified molten steel slag, 10-20% of modified fly ash and 10-30% of sodium bicarbonate by 100% of mass fraction.
The invention also aims to provide a preparation method of the desulfurizing agent, which comprises the following steps:
1) preparing modified lime powder: crushing large limestone by a jaw crusher, and sieving by a 20-30 mesh sieve;
grinding the sieved limestone to 300-400 meshes to prepare lime powder;
adding lime powder, cerium oxide and water into a reaction kettle in sequence, heating to 100 ℃ and 150 ℃, and then carrying out heat preservation reaction for 2-5h to obtain the modified lime powder.
Wherein the addition amount of the cerium oxide is 1-3% of the lime powder; the addition amount of the water is 0.5-1.5% of the total amount of the lime powder and the cerium oxide.
2) Preparing modified molten steel slag: adding blast furnace molten steel slag and manganese oxide into a reaction kettle, heating to 100-150 ℃, and reacting for 2-5h under heat preservation to obtain modified molten steel slag;
wherein the molten steel slag is ground to a particle size of 350 meshes or more; the addition amount of the manganese oxide is 5-8% of the molten steel slag.
3) Preparing modified fly ash: adding the fly ash into a ball mill, crushing and sieving to obtain fly ash fine powder;
adding the fine powder of the fly ash, the medical stone powder and the ferric oxide into a reaction kettle, heating to 100 ℃ and 150 ℃, and then carrying out heat preservation reaction for 2-5h to obtain modified fly ash;
wherein the addition amount of the medical stone powder is 1-3% of the fly ash; the addition amount of the iron oxide is 8-12% of the fly ash.
4) And sequentially adding the modified lime powder, the modified molten steel slag, the modified fly ash and the sodium bicarbonate into the reaction kettle according to the proportion, and stirring for 2-5 hours until the materials are uniformly mixed to obtain the desulfurizer.
The invention further aims to provide application of the desulfurizer, wherein the desulfurizer is used for desulfurization in a coal combustion process at the temperature of 100-400 ℃, and the dosage of the desulfurizer is 0.5-2.5% of the mass of coal;
the technical scheme of the invention at least has the following beneficial effects:
(1) the desulfurizer can be applied to realize desulfurization when coal is combusted, sulfur dioxide which subsequently enters a flue gas desulfurization tower can be effectively and easily removed by pre-removing sulfur in the coal combustion process, the pressure of desulfurization treatment of the subsequent desulfurization tower caused by unstable sulfur content of coal used in a power plant can be solved, and the related cost of desulfurization can be further reduced.
(2) Meanwhile, the desulfurizer fully utilizes the characteristics of industrial waste residue, namely fly ash and molten steel slag, treats waste by waste, has low desulfurization cost, and the removal rate of sulfur dioxide reaches up to 90 percent, so that the production cost of enterprises consuming a large amount of coal is greatly saved, thereby improving the remarkable economic benefit and being beneficial to wide popularization.
(3) The modified materials comprise modified lime powder, modified molten steel slag and modified fly ash, and due to the fact that the modified fly ash contains the ferro-manganese-cerium catalyst, the desulfurizer can be promoted to quickly absorb sulfur dioxide in a flue gas pipeline at the temperature of 100-400 ℃, in addition, the addition of the medical stone powder can promote the absorption efficiency of the sulfur dioxide, and finally, the sodium-based substance of the added sodium bicarbonate can improve the alkalinity of main calcium in the desulfurizer. The invention utilizes the reasonable proportion of the components to ensure that the prepared desulfurizer has obvious desulfurization effect.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention and to thereby make better apparent the scope of the present invention.
Example 1
Providing a desulfurizing agent:
(1) preparing modified lime powder: crushing large limestone by a jaw crusher, and sieving by a 20-30 mesh sieve; grinding the sieved limestone to 350 meshes to prepare lime powder; sequentially adding lime powder, cerium oxide and water into a reaction kettle, heating to 120 ℃, and then carrying out heat preservation reaction for 3 hours to obtain modified lime powder;
wherein the addition amount of the cerium oxide is 1 percent of the lime powder; the addition amount of the water is 0.5 percent of the total amount of the lime powder and the cerium oxide.
(2) Preparing modified molten steel slag: adding blast furnace molten steel slag and manganese oxide into a reaction kettle, heating to 120 ℃, and then carrying out heat preservation reaction for 3 hours to obtain modified molten steel slag;
wherein the molten steel slag is ground to a particle size of 400 meshes; the addition amount of the manganese oxide is 5.5 percent of the molten steel slag.
(3) Preparing modified fly ash: adding the fly ash into a ball mill, crushing and sieving to obtain fly ash fine powder;
adding the fine powder of the fly ash, the medical stone powder and the ferric oxide into a reaction kettle, heating to 120 ℃, and then carrying out heat preservation reaction for 3 hours to obtain modified fly ash;
wherein the addition amount of the medical stone powder is 1.5 percent of the fly ash; the addition amount of the iron oxide is 9 percent of the fly ash.
(4) Sequentially adding 50% of modified lime powder, 15% of modified molten steel slag, 15% of modified fly ash and 20% of sodium bicarbonate into a reaction kettle in percentage by mass, stirring for 3 hours, and uniformly mixing to obtain the desulfurizer 1.
Example 2
Providing a desulfurizing agent:
(1) preparing modified lime powder: crushing large limestone by a jaw crusher, and sieving by a 20-30 mesh sieve; grinding the sieved limestone to 400 meshes to prepare lime powder; sequentially adding lime powder, cerium oxide and water into a reaction kettle, heating to 120 ℃, and then carrying out heat preservation reaction for 3 hours to obtain modified lime powder;
wherein the addition amount of the cerium oxide is 2 percent of the lime powder; the addition amount of the water is 1 percent of the total amount of the lime powder and the cerium oxide.
(2) Preparing modified molten steel slag: adding blast furnace molten steel slag and manganese oxide into a reaction kettle, heating to 120 ℃, and then carrying out heat preservation reaction for 3 hours to obtain modified molten steel slag;
wherein the molten steel slag is ground to a particle size of 500 meshes; the addition amount of the manganese oxide is 6.5 percent of the molten steel slag.
(3) Preparing modified fly ash: adding the fly ash into a ball mill, crushing and sieving to obtain fly ash fine powder;
adding the fine powder of the fly ash, the medical stone powder and the ferric oxide into a reaction kettle, heating to 120 ℃, and then carrying out heat preservation reaction for 3 hours to obtain modified fly ash;
wherein the addition amount of the medical stone powder is 2 percent of the fly ash; the addition amount of the iron oxide is 10.5 percent of the fly ash.
(4) Adding 60% of modified lime powder, 10% of modified molten steel slag, 10% of modified fly ash and 20% of sodium bicarbonate into a reaction kettle in sequence by mass fraction, stirring for 3h until the materials are uniformly mixed, and obtaining the desulfurizer 2.
Example 3
Providing a desulfurizing agent:
(1) preparing modified lime powder: crushing large limestone by a jaw crusher, and sieving by a 20-30 mesh sieve; grinding the sieved limestone to 400 meshes to prepare lime powder; sequentially adding lime powder, cerium oxide and water into a reaction kettle, heating to 120 ℃, and then carrying out heat preservation reaction for 3 hours to obtain modified lime powder;
wherein the addition amount of the cerium oxide is 2.5 percent of the lime powder; the addition amount of the water is 1.5 percent of the total amount of the lime powder and the cerium oxide.
(2) Preparing modified molten steel slag: adding blast furnace molten steel slag and manganese oxide into a reaction kettle, heating to 120 ℃, and then carrying out heat preservation reaction for 3 hours to obtain modified molten steel slag;
wherein the molten steel slag is ground to a particle size of 500 meshes; the addition amount of the manganese oxide is 7 percent of the molten steel slag.
(3) Preparing modified fly ash: adding the fly ash into a ball mill, crushing and sieving to obtain fly ash fine powder;
adding the fine powder of the fly ash, the medical stone powder and the ferric oxide into a reaction kettle, heating to 120 ℃, and then carrying out heat preservation reaction for 3 hours to obtain modified fly ash;
wherein the addition amount of the medical stone powder is 1.5 percent of the fly ash; the addition amount of the iron oxide is 11.5 percent of the fly ash.
(4) Adding 60% of modified lime powder, 15% of modified molten steel slag, 15% of modified fly ash and 10% of sodium bicarbonate into a reaction kettle in sequence by mass fraction, stirring for 3h until the materials are uniformly mixed, and obtaining the desulfurizer 3.
Example 4
Providing a desulfurizing agent:
(1) preparing modified lime powder: crushing large limestone by a jaw crusher, and sieving by a 20-30 mesh sieve; grinding the sieved limestone to 400 meshes to prepare lime powder; sequentially adding lime powder, cerium oxide and water into a reaction kettle, heating to 120 ℃, and then carrying out heat preservation reaction for 3 hours to obtain modified lime powder;
wherein the addition amount of the cerium oxide is 2.5 percent of the lime powder; the addition amount of the water is 1 percent of the total amount of the lime powder and the cerium oxide.
(2) Preparing modified molten steel slag: adding blast furnace molten steel slag and manganese oxide into a reaction kettle, heating to 120 ℃, and then carrying out heat preservation reaction for 3 hours to obtain modified molten steel slag;
wherein the molten steel slag is ground to a particle size of 500 meshes; the addition amount of the manganese oxide is 7 percent of the molten steel slag.
(3) Preparing modified fly ash: adding the fly ash into a ball mill, crushing and sieving to obtain fly ash fine powder;
adding the fine powder of the fly ash, the medical stone powder and the ferric oxide into a reaction kettle, heating to 120 ℃, and then carrying out heat preservation reaction for 3 hours to obtain modified fly ash;
wherein the addition amount of the medical stone powder is 3 percent of the fly ash; the addition amount of the ferric oxide is 12 percent of the fly ash.
(4) And sequentially adding 40% of modified lime powder, 20% of modified molten steel slag, 10% of modified fly ash and 30% of sodium bicarbonate into a reaction kettle in percentage by mass, and stirring for 3 hours until the materials are uniformly mixed to obtain the desulfurizer 4.
Application example 1
At the temperature of 200 ℃, the desulfurizer 1 is put into a desulfurizer injection system through a flue gas pipeline outside the furnace, and the injection of the desulfurizer 1 is automatically controlled by a controller at regular time and quantity according to the inlet sulfur content. At this temperature, the desulfurizing agent reacts with sulfur dioxide to form sulfate, which is captured and removed by a dust collector. Wherein, the addition of the desulfurizer 1 is 0.5 percent of the mass of the coal raw material.
Application example 2
The difference from the application example 1 is that the addition amount of the desulfurizing agent 1 is 1% of the mass of the coal raw material.
Application example 3
The difference from the application example 1 is that the addition amount of the desulfurizing agent 1 is 1.5% of the mass of the coal raw material.
Application example 4
The difference from the application example 1 is that the addition amount of the desulfurizing agent 1 is 2% of the mass of the coal raw material.
Application example 5
The difference from the application example 4 is that a desulfurizing agent 2 is adopted, and the addition amount of the desulfurizing agent 2 is 2 percent of the mass of the coal raw material.
Application example 6
The difference from the application example 1 is that a desulfurizing agent 3 is adopted, and the addition amount of the desulfurizing agent 3 is 2.5 percent of the mass of the coal raw material.
Application example 7
The difference from the application example 6 is that a desulfurizing agent 4 is adopted, and the addition amount of the desulfurizing agent 4 is 2.5 percent of the mass of the coal raw material.
The detection result of the outlet sulfur dioxide in the application example is shown in table 1:
TABLE 1
As can be seen from Table 1, the desulfurizer provided by the application effectively utilizes effective desulfurization components of modified lime powder, modified molten steel slag and modified fly ash under the action of temperature of 100-400 ℃, and when the addition amount of the desulfurizer is 2.5% of the mass of coal, the desulfurization efficiency can reach 90%, and the desulfurization effect is remarkable.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The desulfurizer is characterized by comprising modified lime powder, modified molten steel slag, modified fly ash and sodium bicarbonate.
2. The desulfurizing agent according to claim 1, wherein the desulfurizing agent comprises, by 100% mass fraction, 40-70% of modified lime powder, 10-20% of modified molten steel slag, 10-20% of modified fly ash, and 10-30% of sodium bicarbonate.
3. The desulfurizing agent according to claim 1, wherein the modified lime powder is prepared by adding lime powder, cerium oxide and water into a reaction kettle, heating to 100-150 ℃, and then carrying out heat preservation reaction for 2-5 h.
4. The desulfurizing agent according to claim 3, wherein the amount of the cerium oxide added is 1-3% of the mass of the lime powder; the addition amount of the water is 0.5-1.5% of the total mass of the lime powder and the cerium oxide.
5. The desulfurizing agent according to claim 1, wherein the modified molten steel slag is prepared by adding molten steel slag and manganese oxide into a reaction kettle, heating to 100-150 ℃, and then carrying out heat preservation reaction for 2-5 h.
6. The desulfurizing agent according to claim 5, wherein the molten steel slag has a particle size of 350 mesh or more; the addition amount of the manganese oxide is 5-8% of the mass of the molten steel slag.
7. The desulfurizing agent according to claim 1, wherein the modified fly ash is prepared by adding fly ash, medical stone powder and ferric oxide into a reaction kettle, heating to 100-150 ℃, and then carrying out heat preservation reaction for 2-5 h.
8. The desulfurizing agent according to claim 7, wherein the addition amount of the medical stone powder is 1-3% of the mass of the fly ash; the addition amount of the iron oxide is 8-12% of the mass of the fly ash.
9. The preparation method of the desulfurizer is characterized by sequentially adding modified lime powder, modified molten steel slag, modified fly ash and sodium bicarbonate into a reaction kettle according to a proportion, and stirring for 2-5 hours until the materials are uniformly mixed to obtain the desulfurizer.
10. The application of the desulfurizing agent according to any one of claims 1 to 8, wherein the desulfurizing agent is used for desulfurization in a coal combustion process at the temperature of 100 ℃ and 400 ℃, and the dosage of the desulfurizing agent is 0.5 to 2.5 percent of the mass of coal.
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