CN112403216A - Method and device for flue gas desulfurization by using reduced magnesium slag - Google Patents
Method and device for flue gas desulfurization by using reduced magnesium slag Download PDFInfo
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- CN112403216A CN112403216A CN202011304183.8A CN202011304183A CN112403216A CN 112403216 A CN112403216 A CN 112403216A CN 202011304183 A CN202011304183 A CN 202011304183A CN 112403216 A CN112403216 A CN 112403216A
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- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 144
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 141
- 239000011777 magnesium Substances 0.000 title claims abstract description 141
- 239000002893 slag Substances 0.000 title claims abstract description 141
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 239000003546 flue gas Substances 0.000 title claims abstract description 81
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 64
- 230000023556 desulfurization Effects 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000006703 hydration reaction Methods 0.000 claims abstract description 71
- 230000036571 hydration Effects 0.000 claims abstract description 58
- 239000002002 slurry Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000006243 chemical reaction Methods 0.000 claims abstract description 33
- 238000011049 filling Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 238000009413 insulation Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 abstract description 13
- 239000002699 waste material Substances 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000003245 coal Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000002956 ash Substances 0.000 description 23
- 235000019738 Limestone Nutrition 0.000 description 6
- 239000006028 limestone Substances 0.000 description 6
- 230000003009 desulfurizing effect Effects 0.000 description 4
- 230000003213 activating effect Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000887 hydrating effect Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
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- 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
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- 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
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
-
- 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
-
- 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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a method and a device for flue gas desulfurization by using reduced magnesium slag, belonging to the technical field of flue gas desulfurization. The method of the invention prepares hydrated magnesium slag slurry by uniformly mixing reduced magnesium slag and water for hydration reaction; and introducing flue gas into the obtained hydrated magnesium slag slurry, and performing desulfurization reaction on the flue gas by using the obtained hydrated magnesium slag slurry. The device comprises a hydration reactor and a slurry stirrer arranged in the hydration reactor, wherein the upper part of the hydration reactor is provided with an exhaust port and a reduced magnesium slag feeding port, the side wall of the hydration reactor is provided with a starting water filling port, and the lower part of the hydration reactor is also provided with an air inlet and an ash slag discharging port. The device integrates the storage and the flue gas collection of the reduced magnesium slag, and the process is continuous. The invention utilizes a simple process treatment method, is suitable for wet desulphurization of the tail gas of the pulverized coal furnace, can consume a large amount of waste residues of a magnesium smelting plant, has strong practical value and great environmental benefit, and is suitable for large-scale popularization and use.
Description
Technical Field
The invention belongs to the technical field of flue gas desulfurization, and relates to a method and a device for flue gas desulfurization by using reduced magnesium slag.
Background
The flue gas desulfurization comprises wet desulfurization, semi-dry desulfurization and dry desulfurization; at present, 95 percent of the domestic flue gas desulfurization of power plants adopts a wet limestone-gypsum desulfurization technology. The exploitation of limestone can destroy natural vegetation, and dust pollution and CO are caused in the calcining process2And when the limestone is discharged, the limestone used as a desulfurizer causes certain pressure on the environment after being used for a long time. And the limestone needs to be purchased, which is a great expense for coal-fired power plants.
Magnesium metal is a novel nonferrous metal with specific strength and specific rigidity higher than those of traditional metal structural materials, and is a green metal widely applied to aerospace, weaponry, electronic communication and vehicles. At present, the domestic smelting method of magnesium metal is mainly a Pidgeon method, belongs to one of silicothermic reduction methods, and accounts for more than 90 percent. 5-6 tons of magnesium slag are needed for smelting magnesium by the Pidgeon process every 1 ton of magnesium. At present, the treatment method of the domestic magnesium slag mainly adopts landfill or open-air stacking, which causes pollution to the atmosphere, soil and water.
One of the prior arts of using magnesium slag for power plant desulfurization is to mix magnesium slag with other catalysts and use the mixture in a circulating fluidized bed boiler, and the mixture enters the boiler together with pulverized coal for combustion, and desulfurization is performed in the combustion process. The technology is easy to cause boiler blockage, and the desulfurization conversion rate is low. In the other prior art, magnesium slag and other industrial waste residues such as power plant fly ash are hydrated, the reaction in the hydration process is undefined, the product is uncertain, and whether the prepared desulfurizer can be successfully applied to the market needs further research.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method and a device for desulfurizing flue gas by using reduced magnesium slag, which solve the problem that a large amount of magnesium slag pollutes the environment and reduce the industrial cost of desulfurization treatment of a power plant.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a method for flue gas desulfurization by using reduced magnesium slag, which comprises the following steps: uniformly mixing the reduced magnesium slag with water for hydration reaction to obtain hydrated magnesium slag slurry; and introducing flue gas into the obtained hydrated magnesium slag slurry, and performing desulfurization reaction on the flue gas by using the obtained hydrated magnesium slag slurry.
Preferably, the reduced magnesium slag is high-temperature reduced magnesium slag discharged from a reduction tank of a magnesium smelting plant; the flue gas is flue gas of a coal-fired power plant.
Preferably, the mixing mass ratio of the water to the reduced magnesium slag is 5: 1-10: 1, and the reaction volume ratio of the flue gas to the hydrated magnesium slag slurry is 1.5: 1-2: 1.
Preferably, the temperature of the hydration reaction is 70 +/-5 ℃, the time is 1-2 h, and the stirring speed is 5-30 r/min.
Preferably, the temperature of the desulfurization reaction is 25-40 ℃ and the time is 2-3 h.
The invention also discloses a device for performing flue gas desulfurization by using the reduced magnesium slag, which comprises a hydration reactor and a slurry stirrer arranged in the hydration reactor, wherein the upper part of the hydration reactor is provided with an exhaust port and a reduced magnesium slag feeding port, the side wall of the hydration reactor is provided with a starting water filling port, and the lower part of the hydration reactor is also provided with an air inlet and an ash residue discharge port.
Preferably, the hydration reactor is externally provided with an insulating layer.
Preferably, a reduced magnesium slag feeding port of the hydration reactor is externally connected with a magnesium slag heat insulation storage tank through a pipeline, a heat insulation layer is arranged outside the magnesium slag heat insulation storage tank, and a magnesium slag blanking machine is arranged on the pipeline.
Preferably, the ash discharging port of the hydration reactor is connected with an ash pump, and the air inlet of the reactor is connected with a flue gas induced draft fan.
Further preferably, the position of the ash pump is lower than that of the flue gas induced draft fan, so that ash can flow out of the ash pump conveniently.
Further preferably, a one-way valve is arranged at the joint of the outlet of the flue gas induced draft fan and the hydration reactor, and the one-way valve prevents slurry or ash from entering the inlet of the flue gas induced draft fan.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a method for flue gas desulfurization by using reduced magnesium slag, which comprises the steps of applying the reduced magnesium slag to flue gas desulfurization, and performing desulfurization treatment on the flue gas by using wet desulfurization, wherein hydrated magnesium slag slurry is prepared by performing hydration reaction on the reduced magnesium slag and water, CaO component in the reduced magnesium slag is used as an effective desulfurization component, and the hydrated magnesium slag slurry is used as a desulfurizing agent, so that the conversion rate of the reduced magnesium slag as the desulfurizing agent can be improved. The invention discloses a method for preparing hydrated magnesium slag slurry by hydrating reduced magnesium slag and applying the hydrated magnesium slag slurry to flue gas desulfurization, which realizes waste recycling, can greatly consume waste slag of a magnesium smelting plant, has strong practical value and great environmental benefit, has simple process and is suitable for popularization and application in the field.
Furthermore, the source of the reduced magnesium slag is the high-temperature reduced magnesium slag discharged from the reduction tank of the magnesium smelting plant, because the reduced magnesium slag contains 50-60% of CaO, the reduced magnesium slag can be used as a desulfurizer, and in addition, because the high-temperature reduced magnesium slag discharged from the reduction tank of the magnesium smelting plant often has a high temperature of more than 1200 ℃, partial heat lost in a transportation path is removed, a certain degree of initial heat can still be maintained, and therefore, the heat required by hydration reaction can come from the sensible heat of the high-temperature reduced magnesium slag discharged from the reduction tank of the magnesium smelting plant. Therefore, the high-efficiency desulfurizer can be prepared by directly hydrating the high-temperature reduced magnesium slag discharged from the reduction tank of the magnesium smelting plant, thereby realizing the treatment of the magnesium slag, realizing the reutilization of waste resources and simultaneously realizing a continuous process method.
Further, the flue gas of the invention is the flue gas of a conventional coal-fired power plant, and the flue gas contains SO2。
The invention also discloses a device for realizing the method for flue gas desulfurization by using the reduced magnesium slag, wherein the reduced magnesium slag and water are uniformly mixed by a hydration reactor to carry out hydration reaction, and then reaction substances are added into the device by a reduced magnesium slag feeding port, a starting water feeding port and an air inlet, so that the reaction degrees of the hydration reaction and the desulfurization reaction are more sufficient by a slurry stirrer, the desulfurization efficiency is improved, the reacted materials can be separated from the system by an ash residue discharge port, and new materials are added at the same time, and the overall effect of the device for flue gas desulfurization by using the reduced magnesium slag is enhanced. In addition, the device for performing the flue gas desulfurization method by using the reduced magnesium slag is different from the device for performing desulfurization treatment in the combustion process of a circulating fluidized bed boiler in the prior art, but performs post-treatment on the flue gas of the tail gas of a coal-fired power plant, simplifies reaction process devices, has the characteristics of simple and efficient device use, and is suitable for large-scale popularization and use.
Furthermore, the heat-insulating layer is arranged outside the hydration reactor, so that the control of the water temperature in the hydration reactor can be facilitated, and the temperature environment of 70 +/-5 ℃ of the hydration reaction can be maintained.
Furthermore, ash slag after reaction can flow out of the ash slag pump conveniently by setting the position of the ash slag pump to be lower than the smoke induced draft fan.
In summary, the invention has the following advantages:
1) in the device for performing the flue gas desulfurization method by using the reduced magnesium slag, the hydration reactor realizes the heat balance of the whole method-device system by using the sensible heat of the high-temperature reduced magnesium slag, and the flue gas desulfurization is continuously performed;
2) the device for flue gas desulfurization by using the reduced magnesium slag integrates the storage and storage of the reduced magnesium slag and the collection of flue gas, the process is continuous, and relevant experiments prove that the desulfurization efficiency of the hydrated magnesium slag slurry can reach 70-78%;
3) the invention provides a method for consuming a large amount of magnesium slag, which reduces the environmental pollution in magnesium smelting;
4) the method can reduce the demand of lime in the existing desulfurization treatment, reduce the cost, and indirectly reduce the harm of limestone mining to the environment by using the hydrated magnesium slag slurry to replace limestone for desulfurization.
Therefore, the method is suitable for comprehensive utilization of magnesium slag of magnesium metal smelting enterprises.
Drawings
FIG. 1 is a schematic view of the apparatus for flue gas desulfurization using reduced magnesium slag according to the present invention.
Wherein: 1-a hydration reactor; 2-a magnesium slag heat-insulation storage tank; 3-blanking machine of magnesium slag; 4-starting a water filling port; 5-a smoke induced draft fan; 6-an exhaust port; 7-ash pump; 8-slurry mixer; 9-pipeline.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the device for performing flue gas desulfurization by using reduced magnesium slag disclosed by the invention comprises a hydration reactor 1, a magnesium slag heat-insulating storage tank 2, a magnesium slag blanking machine 3, a starting water filling port 4, a flue gas induced draft fan 5, an exhaust port 6, an ash slag pump 7 and a slurry stirrer 8. Wherein, magnesium sediment thermal-insulated storage tank 2 is connected with hydration reactor 1 through pipeline 9, the magnesium sediment blanking machine 3 is equipped with on pipeline 9, upper portion is equipped with thick liquid agitator 8 and guarantees the gas vent 6 that hydration goes on under the ordinary pressure in hydration reactor 1, upper left side is equipped with the start-up filler 4 at hydration reactor 1, lower left side is equipped with flue gas draught fan 5 in hydration reactor 1 outside, export at flue gas draught fan 5 is equipped with the check valve, the check valve prevents that the thick liquid from getting into flue gas draught fan 5 entry, ash pump 7 is established at the lower right side of hydration reactor 1, ash pump 7 position is less than flue gas draught fan 5, discharge the lime-ash that the desulfurization reaction obtained.
Wherein, the hydration reactor 1 is externally provided with a heat-insulating layer for ensuring that the water temperature is controlled at 70 +/-5 ℃, and the magnesium slag heat-insulating storage tank 2 is provided with a heat-insulating layer. The hydration reactor 1 holds a charge of 12 hours and leaves a 50% excess volume that allows most of the solids to remain for 12-14 hours.
Wherein, what flue gas draught fan 5 took out is coal fired power plant's flue gas, directly lets in among the hydration reactor 1.
Wherein, be equipped with the check valve on the pipeline between flue gas draught fan 5 with hydration reactor 1, the check valve is used for preventing water or hydrated magnesium sediment thick liquid from flowing into the pipeline of flue gas draught fan 5.
Wherein, a thermometer and a pressure gauge are also arranged on the hydration reactor 1.
The method for flue gas desulfurization using reduced magnesium slag disclosed in the present invention will be described below with reference to the above-mentioned apparatus for flue gas desulfurization using reduced magnesium slag.
The invention also discloses a method for flue gas desulfurization by using the reduced magnesium slag, which comprises the steps of uniformly mixing the reduced magnesium slag with water to perform hydration reaction to prepare hydrated magnesium slag slurry; and introducing flue gas into the obtained hydrated magnesium slag slurry to perform desulfurization reaction. The specific working process is as follows:
the reduced magnesium slag is sent into a hydration reactor 1 from a magnesium slag heat insulation storage tank 2 through a magnesium slag blanking machine 3, and the flue gas (containing SO) of the power plant is sent from a flue gas induced draft fan 52) Is introduced into a hydration reactor1, the flue gas participates in the reaction, and after the reaction is finished, ash residues are transferred to an ash residue storage from an ash residue pump 7 and are discharged.
The working process of the method comprises the following steps:
1) the hydration reactor 1 is added with water with the volume of 1/2-2/3 through the starting water filling port 4.
2) The method comprises the steps of directly adding reduced magnesium slag and water into a hydration reactor 1 according to the mass ratio of the water to the reduced magnesium slag of 5: 1-10: 1, keeping the temperature of hydration reaction at 70 +/-5 ℃, leaching for 1-2 hours, and stirring at the speed of 5-30 r/min.
3) Mixing the flue gas (containing SO) of coal-fired power plant2) And introducing the mixture into the hydration reactor 1 from a flue gas induced draft fan 5 for reaction.
4) Discharging the ash slag discharged after the reaction of the step 3) through an ash slag pump 7.
5) The hydration reactor 1 supplements water quantity in time, keeps the water volume constant, and the system continuously carries out desulfurization reaction.
Wherein the reduced magnesium slag is high-temperature waste slag with the temperature of more than 1200 ℃ discharged by a reduction tank of a magnesium smelting plant.
Wherein the heat required for the hydration reaction comes from the sensible heat of the reduced magnesium slag.
Wherein the volume ratio of the reaction dosage of the flue gas and the hydrated magnesium slag slurry is 1.5: 1-2: 1.
Wherein the temperature of the desulfurization reaction of the flue gas and the hydrated magnesium slag slurry is 25-40 ℃, and the time is 2-3 h.
By adopting the method and the device for desulfurizing the flue gas by utilizing the reduced magnesium slag, the desulfurization efficiency of the flue gas can reach 70-78 percent.
The invention will be further illustrated with reference to specific examples:
example 1:
taking high-temperature waste slag with the temperature of over 1200 ℃ discharged by a reduction tank of a magnesium smelting plant.
The hydration reactor 1 is fed with water of its volume 1/2 by activating the water filling opening 4;
placing the high-temperature reduction magnesium slag in a magnesium slag heat insulation storage tank 2, directly adding the high-temperature reduction magnesium slag into a hydration reactor 1 by using a magnesium slag blanking machine 3 according to the mass ratio of water to slag of 5:1, keeping the hydration temperature at 75 ℃ for 1h, and stirring the slurry at the stirring speed of a slurry stirrer 8 of 5r/min to obtain hydrated magnesium slag slurry;
mixing coal-fired flue gas (containing SO)2) And introducing the coal-fired flue gas and the hydrated magnesium slag slurry into a hydration reactor 1 from a flue gas induced draft fan 5 for reaction, wherein the volume ratio of the reaction dosage of the coal-fired flue gas to the hydrated magnesium slag slurry is 1.5:1, the temperature of the desulfurization reaction is 25 ℃, and the time is 3 hours.
And discharging the ash slag discharged after the reaction through an ash slag pump 7.
The hydration reactor 1 supplements water quantity in time, keeps the water volume constant, and the system continuously carries out desulfurization reaction.
The desulfurization efficiency of the hydrated magnesium slag slurry can reach 70 percent.
Example 2
The hydration reactor 1 is fed with water of its volume 2/3 by activating the water filling opening 4; the high-temperature reduction magnesium slag is placed in a magnesium slag heat insulation storage tank 2, the high-temperature reduction magnesium slag is directly added into a hydration reactor 1 by a magnesium slag blanking machine 3 according to the mass ratio of water to slag of 10:1, the hydration temperature is kept at 65 ℃ for 2 hours, and the stirring speed of a slurry stirrer 8 is 10 r/min; the volume ratio of the reaction dosage of the coal-fired flue gas and the hydrated magnesium slag slurry is 1.8:1, the temperature of the desulfurization reaction is 32 ℃, and the time is 2.5 h; the rest is the same as embodiment 1.
The desulfurization efficiency of the hydrated magnesium slag slurry can reach 72 percent.
Example 3
The hydration reactor 1 is fed with water of its volume 3/5 by activating the water filling opening 4; the high-temperature reduction magnesium slag is placed in a magnesium slag heat insulation storage tank 2, the high-temperature reduction magnesium slag is directly added into a hydration reactor 1 by a magnesium slag blanking machine 3 according to the mass ratio of water to slag of 8:1, the hydration temperature is kept at 70 ℃ for 1.5h, and the stirring speed of a slurry stirrer 8 is 30 r/min; the volume ratio of the reaction dosage of the coal-fired flue gas and the hydrated magnesium slag slurry is 2:1, the temperature of the desulfurization reaction is 40 ℃, and the time is 2 hours; the rest is the same as embodiment 1.
The desulfurization efficiency of the hydrated magnesium slag slurry can reach 78 percent.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A method for flue gas desulfurization by using reduced magnesium slag is characterized by comprising the following steps: uniformly mixing the reduced magnesium slag with water for hydration reaction to obtain hydrated magnesium slag slurry; and introducing flue gas into the obtained hydrated magnesium slag slurry, and performing desulfurization reaction on the flue gas by using the obtained hydrated magnesium slag slurry.
2. The method for flue gas desulfurization using reduced magnesium slag according to claim 1, wherein the reduced magnesium slag is high-temperature reduced magnesium slag discharged from a reduction tank of a magnesium smelter; the flue gas is flue gas of a coal-fired power plant.
3. The method for flue gas desulfurization by using reduced magnesium slag according to claim 1, wherein the mixing mass ratio of water to the reduced magnesium slag is 5:1 to 10:1, and the reaction volume ratio of the flue gas to the slurry of hydrated magnesium slag is 1.5:1 to 2: 1.
4. The method for flue gas desulfurization by using reduced magnesium slag according to claim 1, wherein the temperature of the hydration reaction is 70 ± 5 ℃, the time is 1-2 hours, and the stirring speed is 5-30 r/min.
5. The method for flue gas desulfurization using reduced magnesium slag according to claim 1, wherein the temperature of the desulfurization reaction is 25 to 40 ℃ and the time is 2 to 3 hours.
6. A device for performing flue gas desulfurization by using reduced magnesium slag according to any one of claims 1 to 5, characterized by comprising a hydration reactor (1) and a slurry stirrer (8) arranged inside the hydration reactor (1), wherein an exhaust port (6) and a reduced magnesium slag feeding port are arranged at the upper part of the hydration reactor (1), a starting water filling port (4) is arranged on the side wall of the hydration reactor (1), and an air inlet and an ash slag discharging port are arranged at the lower part of the hydration reactor (1).
7. The apparatus according to claim 6, characterized in that the hydration reactor (1) is externally provided with an insulation layer.
8. The device according to claim 6, characterized in that a reduced magnesium slag feeding port of the hydration reactor (1) is externally connected with a magnesium slag heat insulation storage tank (2) through a pipeline (9), a heat insulation layer is arranged outside the magnesium slag heat insulation storage tank (2), and a magnesium slag blanking machine (3) is arranged on the pipeline (9).
9. The device according to claim 6, characterized in that the ash discharge port of the hydration reactor (1) is connected with an ash pump (7), and the air inlet of the hydration reactor (1) is connected with a flue gas induced draft fan (5).
10. The device according to claim 9, characterized in that the ash pump (7) is located below the flue gas induced draft fan (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011304183.8A CN112403216A (en) | 2020-11-19 | 2020-11-19 | Method and device for flue gas desulfurization by using reduced magnesium slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011304183.8A CN112403216A (en) | 2020-11-19 | 2020-11-19 | Method and device for flue gas desulfurization by using reduced magnesium slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112403216A true CN112403216A (en) | 2021-02-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115722053A (en) * | 2022-11-10 | 2023-03-03 | 西安西热锅炉环保工程有限公司 | Dispose solid useless CO in coordination of multisource 2 Trapping system and method |
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| CN101703886A (en) * | 2009-10-29 | 2010-05-12 | 太原理工大学 | Desulfuration method by directly utilizing magnesium slags in circulating fluidized bed boiler |
| CN103055691A (en) * | 2013-01-28 | 2013-04-24 | 太原理工大学 | Method and device for continuously preparing desulfurizer by self-heating hydration of magnesium slag and fly ash |
| CN103566750A (en) * | 2013-11-26 | 2014-02-12 | 达州市恒成能源（集团）有限责任公司 | Flue gas desulfurization method |
| CN104212944A (en) * | 2014-10-08 | 2014-12-17 | 中国十九冶集团有限公司 | Hydration desulfurizer and preparation method thereof |
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| CN101703886A (en) * | 2009-10-29 | 2010-05-12 | 太原理工大学 | Desulfuration method by directly utilizing magnesium slags in circulating fluidized bed boiler |
| CN103055691A (en) * | 2013-01-28 | 2013-04-24 | 太原理工大学 | Method and device for continuously preparing desulfurizer by self-heating hydration of magnesium slag and fly ash |
| CN103566750A (en) * | 2013-11-26 | 2014-02-12 | 达州市恒成能源（集团）有限责任公司 | Flue gas desulfurization method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115722053A (en) * | 2022-11-10 | 2023-03-03 | 西安西热锅炉环保工程有限公司 | Dispose solid useless CO in coordination of multisource 2 Trapping system and method |
| CN115722053B (en) * | 2022-11-10 | 2024-06-04 | 西安西热锅炉环保工程有限公司 | Disposal of multi-source solid waste CO-produced CO2Trapping system and method |
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