CN117065909A - Combined treatment method for preparing blast furnace slag micropowder and purifying flue gas of hot blast stove - Google Patents
Combined treatment method for preparing blast furnace slag micropowder and purifying flue gas of hot blast stove Download PDFInfo
- Publication number
- CN117065909A CN117065909A CN202311044916.2A CN202311044916A CN117065909A CN 117065909 A CN117065909 A CN 117065909A CN 202311044916 A CN202311044916 A CN 202311044916A CN 117065909 A CN117065909 A CN 117065909A
- Authority
- CN
- China
- Prior art keywords
- blast furnace
- flue gas
- hot blast
- furnace slag
- pulverizer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 152
- 239000003546 flue gas Substances 0.000 title claims abstract description 152
- 239000002893 slag Substances 0.000 title claims abstract description 136
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000000428 dust Substances 0.000 claims abstract description 48
- 239000000843 powder Substances 0.000 claims abstract description 37
- 238000002360 preparation method Methods 0.000 claims abstract description 30
- 238000000746 purification Methods 0.000 claims abstract description 24
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000003860 storage Methods 0.000 claims abstract description 18
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 68
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 34
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 34
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 22
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 22
- 239000000920 calcium hydroxide Substances 0.000 claims description 22
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 22
- 238000006477 desulfuration reaction Methods 0.000 claims description 22
- 230000023556 desulfurization Effects 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000004744 fabric Substances 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000010298 pulverizing process Methods 0.000 claims description 10
- 239000000779 smoke Substances 0.000 claims description 7
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- 239000003595 mist Substances 0.000 claims description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 5
- 235000011152 sodium sulphate Nutrition 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 4
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 4
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 4
- 238000004140 cleaning Methods 0.000 claims 3
- 239000000292 calcium oxide Substances 0.000 abstract description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract description 3
- 239000011593 sulfur Substances 0.000 abstract description 3
- 229910052717 sulfur Inorganic materials 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 description 13
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 9
- 235000011941 Tilia x europaea Nutrition 0.000 description 9
- 239000004571 lime Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 238000011084 recovery Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/24—Passing gas through crushing or disintegrating zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
-
- 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
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C2201/00—Codes relating to disintegrating devices adapted for specific materials
- B02C2201/06—Codes relating to disintegrating devices adapted for specific materials for garbage, waste or sewage
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Food Science & Technology (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
A combined treatment method for blast furnace slag micropowder preparation and hot blast stove flue gas purification relates to the field of resource recycling. In the combined treatment method for preparing the blast furnace slag micropowder and purifying the hot blast furnace flue gas, the blast furnace slag treated by the blast furnace is conveyed to a pulverizer to be pulverized into the blast furnace slag micropowder, and meanwhile, the hot blast furnace flue gas of the blast furnace hot blast furnace is conveyed to the pulverizer to dry the blast furnace slag micropowder, so that the blast furnace slag micropowder is mixed and reacted, and sulfur dioxide in the hot blast furnace flue gas is removed; slag micropowder produced by a pulverizer is collected by using a bag dust collector and then conveyed to a powder ore bin for storage, and hot blast furnace flue gas filtered by the bag dust collector is pressurized and then discharged through a chimney. The combined treatment method for preparing the blast furnace slag micropowder and purifying the hot blast stove flue gas provided by the application uses the blast furnace hot blast stove flue gas to dry the moisture in the slag micropowder and uses the calcium oxide in the slag micropowder to remove sulfur dioxide in the hot blast stove flue gas, thereby saving energy consumption and reducing carbon and sulfur emission.
Description
Technical Field
The application relates to the field of resource recycling, in particular to a method for combined treatment of blast furnace slag micropowder preparation and hot blast stove flue gas purification and a method thereof.
Background
The slag micropowder is superfine powder obtained by grinding blast furnace slag, and can be used as a high-quality admixture for cement and concrete to improve the added value of slag, but grinding and drying hot air is mainly provided by a coal-fired or gas heating furnace during slag micropowder processing, so that the energy consumption is high, the carbon emission is large, secondary flue gas generated by the heating furnace needs to be further treated, and the environment protection requirement is difficult to meet.
SO of blast furnace hot blast stove flue gas 2 The content is 150mg/Nm 3 SO that does not meet regulation 2 ≤50mg/Nm 3 It is required to perform desulfurization treatment. The prior domestic hot blast stove desulfurization technology mainly comprises SDS nano-base dry desulfurization, fixed bed dry desulfurization, moving bed dry desulfurization and the like, and the methods have the problems of high initial investment and operation cost, large byproduct treatment difficulty, large occupied area and the like.
Disclosure of Invention
The application aims to provide a combined treatment method for preparing blast furnace slag micropowder and purifying hot-blast stove flue gas, which uses the blast furnace hot-blast stove flue gas to dry moisture in the slag micropowder and uses calcium oxide in the slag micropowder to remove sulfur dioxide in the hot-blast stove flue gas, thereby saving energy consumption and reducing carbon and sulfur emission.
The application is realized in the following way:
the application provides a blast furnace slag micropowder preparation and hot-blast stove flue gas purification combined treatment method, which comprises the following steps:
conveying the blast furnace slag after the blast furnace treatment to a pulverizer to pulverize into blast furnace slag micropowder, conveying hot blast furnace flue gas of a blast furnace hot blast furnace into the pulverizer to dry the blast furnace slag micropowder, mixing the blast furnace slag micropowder for reaction, and removing sulfur dioxide in the hot blast furnace flue gas;
the blast furnace slag micropowder discharged by the pulverizer is collected by using a cloth bag dust collector and then is conveyed to a powder ore bin for storage, and hot blast furnace flue gas filtered by the cloth bag dust collector is pressurized and discharged through a chimney.
In some alternative embodiments, a mist of water is sprayed into the stove flue gas before it is fed to the pulverizer.
In some alternative embodiments, slaked lime is added to the pulverizer when the blast furnace slag after the blast furnace treatment is conveyed to the pulverizer to be pulverized into blast furnace slag micropowder.
In some alternative embodiments, as slaked lime is added to the pulverizer, the bag house is used to collect unreacted complete slaked lime discharged from the pulverizer and transported back to the pulverizer using an air chute.
In some alternative embodiments, the method further comprises the steps of: crushing sodium bicarbonate, putting the crushed sodium bicarbonate into a cloth bag dust collector, mixing and reacting hot blast stove smoke entering the cloth bag dust collector with sodium bicarbonate micropowder to remove sulfur dioxide, collecting sodium sulfide generated by the reaction by using the cloth bag dust collector, and conveying the sodium sulfide to a sodium sulfate powder bin for storage.
In some alternative embodiments, baking soda is crushed and then put into a bag dust collector through a baking soda desulfurization reactor, and hot blast stove flue gas is introduced into the baking soda desulfurization reactor, so that the hot blast stove flue gas and the crushed baking soda are mixed and reacted in the baking soda desulfurization reactor and then enter the bag dust collector.
In some alternative embodiments, the flue gas of the hot blast stove is cooled to 190-200 ℃ through a gas preheater and an air preheater respectively, then is introduced into a pulverizer, and the gas and air reaching more than 180 ℃ after being preheated in the gas preheater and the air preheater are introduced into the hot blast stove.
In some alternative embodiments, the air heated to 600-800 ℃ is mixed with the hot blast stove flue gas prior to being introduced into the pulverizer after heating the air using a heating furnace, such that the temperature of the flue gas introduced into the pulverizer is 280-300 ℃.
In some alternative embodiments, the blast furnace slag after blast furnace treatment is dried to a moisture level of less than 20% and then conveyed to a pulverizer mill for pulverization.
The beneficial effects of the application are as follows: the application provides a blast furnace slag micropowder preparation and hot blast stove flue gas purification combined treatment method, which comprises the following steps: conveying the blast furnace slag after the blast furnace treatment to a pulverizer to pulverize into blast furnace slag micropowder, conveying hot blast furnace flue gas of a blast furnace hot blast furnace into the pulverizer to dry the blast furnace slag micropowder, mixing the blast furnace slag micropowder for reaction, and removing sulfur dioxide in the hot blast furnace flue gas; the blast furnace slag micropowder discharged by the pulverizer is collected by using a cloth bag dust collector and then is conveyed to a powder ore bin for storage, and hot blast furnace flue gas filtered by the cloth bag dust collector is pressurized and discharged through a chimney. The combined treatment method for preparing the blast furnace slag micropowder and purifying the hot blast stove flue gas provided by the application uses the blast furnace hot blast stove flue gas to dry the moisture in the slag micropowder and uses the calcium oxide in the slag micropowder to remove sulfur dioxide in the hot blast stove flue gas, thereby saving energy consumption and reducing carbon and sulfur emission.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a combined treatment method of blast furnace slag micropowder preparation and hot blast stove flue gas purification provided in embodiment 1 of the application;
fig. 2 is a schematic structural diagram of a blast furnace slag powder preparation and hot blast stove flue gas purification treatment system used in the blast furnace slag powder preparation and hot blast stove flue gas purification combined treatment method provided in embodiment 1 of the present application;
FIG. 3 is a schematic flow chart of a combined treatment method of blast furnace slag micropowder preparation and hot blast stove flue gas purification provided in embodiment 2 of the present application;
fig. 4 is a schematic structural diagram of a blast furnace slag powder preparation and hot blast stove flue gas purification treatment system used in the blast furnace slag powder preparation and hot blast stove flue gas purification combined treatment method provided in embodiment 2 of the present application;
FIG. 5 is a schematic flow chart of a combined treatment method of blast furnace slag micropowder preparation and hot blast stove flue gas purification provided in example 3 of the present application;
fig. 6 is a schematic structural diagram of a blast furnace slag powder preparation and hot blast stove flue gas purification treatment system used in the blast furnace slag powder preparation and hot blast stove flue gas purification combined treatment method provided in embodiment 3 of the present application;
FIG. 7 is a schematic flow chart of a combined treatment method of blast furnace slag micropowder preparation and flue gas purification of a hot blast stove according to embodiment 4 of the present application;
fig. 8 is a schematic structural diagram of a blast furnace slag powder preparation and hot blast stove flue gas purification treatment system used in the blast furnace slag powder preparation and hot blast stove flue gas purification combined treatment method provided by embodiment 4 of the application.
In the figure: 100. a raw material bin; 110. a belt conveyor; 120. a vertical pulverizer; 130. a slag dosing machine; 140. a flue gas pipeline of the hot blast stove; 150. a cloth bag dust collector; 160. a powder ore bin; 170. a micro powder conveying device; 180. a chimney; 190. a smoke exhaust pipe; 200. an induced draft fan; 210. a flue gas pretreatment device; 220. a spraying device; 230. a lime bin; 240. a slaked lime reactor; 250. a screw feeder; 260. a stirring device; 270. a water supply pipe; 280. a return pipe; 290. an air chute; 300. a first shut-off valve; 310. a baking soda bin; 320. baking soda mill; 330. a baking soda dosing machine; 340. a delivery tube; 350. a baking soda desulfurization reactor; 360. a connecting pipe; 370. a second shut-off valve; 380. a flue gas delivery pipe; 390. a third shut-off valve; 400. a gas preheater; 410. an air preheater; 420. a heating furnace; 430. a hot air delivery pipe; 440. a recovery conveying device; 450. sodium sulfate powder bin; 500. blast furnace hot blast stove.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use of the product of the application, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The characteristics and performances of the blast furnace slag micropowder preparation and hot blast stove flue gas purification combined treatment method of the present application are described in further detail below with reference to examples.
Example 1
As shown in fig. 1 and 2, the present application provides a combined treatment method for preparing blast furnace slag micropowder and purifying blast furnace flue gas, which is performed by using a blast furnace slag micropowder preparation and purifying blast furnace flue gas treatment system comprising a raw material bin 100 for storing blast furnace slag, a belt conveyor 110 for conveying blast furnace slag to the raw material bin 100, a vertical pulverizer 120 for pulverizing received blast furnace slag, a slag quantitative feeder 130 for conveying materials in the raw material bin 100 to the vertical pulverizer 120, a blast furnace flue gas pipeline 140 for conveying blast furnace flue gas discharged from the blast furnace 500 to the vertical pulverizer 120, a bag dust collector 150 for receiving ground products of the vertical pulverizer 120, a dust hopper 160, a micropowder conveying device 170 for collecting micropowder from the bag dust collector 150 and conveying the micropowder to the dust hopper 160, a chimney 180, a flue gas exhaust 190 for conveying purified flue gas to the chimney 180, and a draught fan 200 for pressurizing flue gas in the exhaust 190, wherein a pre-smoke pipe 210 is arranged between the vertical pulverizer 120 and the pipeline 210, and a spray flue gas purifier is arranged in the flue gas purifier 220; the fine powder conveying device 170 in this embodiment is a pneumatic conveying device.
The blast furnace slag micropowder preparation and hot blast stove flue gas purification combined treatment method provided by the embodiment of the application comprises the following steps: after the blast furnace slag with the water content of about 25% after blast furnace treatment is piled and aired in a blast furnace slag yard and an indoor yard until the water content is reduced to 15-20%, the blast furnace slag after airing is conveyed to a raw material bin 100 for storage by using a belt conveyor 110, then the blast furnace slag in the raw material bin 100 is conveyed to a vertical pulverizer 120 by a slag quantitative feeder 130 connected with the bottom, so that the slag is crushed in the vertical pulverizer 120 to prepare blast furnace slag micro powder, and meanwhile, hot blast furnace flue gas is conveyed into the vertical pulverizer 120 by using a hot blast furnace flue gas pipeline 140 communicated with a blast furnace hot blast furnace 500, the method comprises the steps of using hot blast furnace flue gas to dry pulverized blast furnace slag micropowder in a vertical pulverizer 120, enabling the water content of the blast furnace slag micropowder discharged by the vertical pulverizer 120 to be reduced to about 1%, finally discharging the pulverized micropowder with proper granularity out of the vertical pulverizer 120, entering a bag dust collector 150 communicated with a discharge port of the vertical pulverizer 120, enabling the bag dust collector 150 to collect the blast furnace slag micropowder, then using a micropowder conveying device 170 communicated with the bottom of the bag dust collector 150 to convey the blast furnace slag micropowder to a powder ore bin 160 for storage, pressurizing flue gas filtered by the bag dust collector 150 by a draught fan 200, and then introducing the flue gas into a chimney 180 through a smoke exhaust pipe 190, wherein the dust content of the discharged flue gas is less than or equal to 10mg/Nm 3 The fine powder conveying device 170 is a pneumatic conveying apparatus.
Wherein, the hot blast stove flue gas is conveyed to a flue gas preprocessor 210 through a hot blast stove flue gas pipeline 140 for spray treatment, then is introduced into a vertical pulverizer 120, and is preprocessed by a spray device 220Spraying water mist in the device 210 to enable the water mist to be mixed with SO in the flue gas of the hot blast stove 2 Reaction to produce H 2 SO 3 Then the slag powder is introduced into a vertical pulverizer 120 to lead CaO in the blast furnace slag micropowder and H in the flue gas in the vertical pulverizer 120 2 SO 3 Fully contact reaction to generate CaSO 3 Plays a role in flue gas desulfurization, and ensures SO at the outlet of a chimney 180 2 The concentration is less than or equal to 35mg/Nm 3 . The temperature of the flue gas of the hot blast furnace is 280-300 ℃ when being introduced into the vertical pulverizer 120, and the temperature of the flue gas discharged from the discharge port of the vertical pulverizer 120 is 85-95 ℃.
In the embodiment, the filtering wind speed of the cloth bag dust collector 150 is less than or equal to 0.65m/min, so that the concentration of the flue gas dust at the outlet of the chimney 180 is less than or equal to 10mg/Nm 3 Meets the ultra-low emission requirement.
Example 2
As shown in fig. 3 and 4, the present application provides a combined treatment method for preparing blast furnace slag micropowder and purifying blast furnace flue gas, which uses a blast furnace slag micropowder preparation and purifying blast furnace flue gas treatment system different from the blast furnace slag micropowder preparation and purifying blast furnace flue gas treatment system provided in embodiment 1 in that in this embodiment, the combined treatment method further comprises a lime bin 230, a slaked lime reactor 240 for receiving lime in the lime bin 230, and a screw feeder 250 for feeding the material in the slaked lime reactor 240 to the feed inlet of the vertical pulverizer 120, wherein the slaked lime reactor 240 is connected with a stirring device 260 and a water feeding pipe 270; the bottom of the bag collector 150 is connected with an air chute 290 through a return pipe 280, the air chute 290 is used for conveying the material in the return pipe 280 to the vertical pulverizer 120, and the return pipe 280 is provided with a first stop valve 300.
The blast furnace slag micropowder preparation and hot blast furnace flue gas purification combined treatment method provided by the embodiment of the application comprises the steps of piling and airing blast furnace slag with water content of about 25% after blast furnace treatment in a blast furnace slag storage yard and an indoor storage yard until the water content is reduced to 15-20%, conveying the air-dried blast furnace slag to a raw material bin 100 for storage by using a belt conveyor 110, conveying the blast furnace slag in the raw material bin 100 to a vertical pulverizer 120 by using a slag quantitative feeder 130 connected with the bottom, and grinding and pulverizing the slag in the vertical pulverizer 120 to prepare the blast furnace slag micropowder, and simultaneouslyThe flue gas of the hot blast furnace is conveyed into the vertical pulverizer 120 by using a flue gas pipeline 140 communicated with the hot blast furnace 500, the pulverized blast furnace slag micropowder in the vertical pulverizer 120 is dried by using the flue gas of the hot blast furnace, the water content of the blast furnace slag micropowder discharged from the vertical pulverizer 120 is reduced to about 1%, the micropowder with proper granularity after pulverization is finally discharged out of the vertical pulverizer 120, and enters a bag dust collector 150 communicated with a discharge port of the vertical pulverizer 120, so that the bag dust collector 150 captures the blast furnace slag micropowder and then conveys the blast furnace slag micropowder to a powder ore bin 160 for storage by using a micropowder conveying device 170 communicated with the bottom of the bag dust collector 150, and meanwhile, the flue gas filtered by the bag dust collector 150 is pressurized by a draught fan 200 and then is discharged through a chimney 180, and the dust concentration of the discharged flue gas is less than or equal to 10mg/Nm 3 Lime is stored by arranging a lime bin 230 at the same time, lime stored in the lime bin 230 is received by using a slaked lime reactor 240 arranged below the lime bin 230, water is added into the slaked lime reactor 240 by using a water adding pipe 270, the slaked lime is obtained by stirring and reacting by using a stirring device 260, and then the slaked lime in the slaked lime reactor 240 is conveyed into a vertical pulverizer 120 by using a screw feeder 250, so that the slaked lime is in the vertical pulverizer 120 and H in hot blast furnace flue gas 2 SO 3 Reaction to produce CaSO 3 Plays a role in flue gas desulfurization, and the feeding amount of the screw feeder 250 discharges SO according to the chimney 180 2 Concentration adjustment of (2) to ensure SO in the flue gas exhausted by the chimney 180 2 The content is less than or equal to 35mg/Nm 3 。
When slag micropowder is not produced, the slag quantitative feeder 130 can be controlled to stop conveying the materials in the raw material bin 100 into the vertical pulverizer 120, the slaked lime in the slaked lime reactor 240 is conveyed into the vertical pulverizer 120 only by using the screw feeder 250, and SO in flue gas at the outlet of the chimney 180 is ensured by adjusting the input amount of the slaked lime 2 The content is less than or equal to 35mg/Nm 3 The dust concentration of the flue gas is less than or equal to 10mg/Nm 3 . When the reaction time is limited, the slaked lime can not completely react with H in the flue gas of the hot blast stove 2 SO 3 In the reaction, the first cut-off valve 300 is controlled to be opened, so that a part of unreacted hydrated lime collected at the bottom of the bag collector 150 is re-conveyed into the vertical pulverizer 120 through the return pipe 280 and the air chute 290 for proceedingThe other part of the slaked lime is sent to the fine ore bin 160 for storage by the micro powder conveying device 170 for desulfurization reaction.
Example 3
As shown in fig. 5 and 6, the present application provides a combined treatment method for preparing blast furnace slag micropowder and purifying blast furnace flue gas, which is characterized in that the blast furnace slag micropowder preparation and purifying blast furnace flue gas treatment system used in the present application is different from the blast furnace slag micropowder preparation and purifying blast furnace flue gas treatment system provided in embodiment 1 in that the present application further comprises a baking soda silo 310, a baking soda mill 320 for pulverizing baking soda, a baking soda dosing machine 330 for delivering the material in the baking soda silo 310 to the baking soda mill 320 for pulverizing, and a delivery pipe 340 for delivering the pulverized material of the baking soda mill 320 to the bag dust collector 150, a baking soda desulfurization reactor 350 is provided between the baking soda mill 320 and the delivery pipe 340, the blast furnace flue gas pipe 140 is connected with the baking soda desulfurization reactor 350 through a connecting pipe 360, a second cut-off valve 370 for controlling the opening and closing of the second cut-off valve is provided on the connecting pipe 360, and the flue gas preprocessor 210 is connected with the vertical pulverizing mill 120 through a flue gas delivery pipe 380 provided with a third cut-off valve 390; the cloth bag dust collector 150 is also connected to a sodium sulfate powder bin 450 via a recovery conveyor 440, in this embodiment, the recovery conveyor 440 is a pneumatic conveyor.
The blast furnace slag micropowder preparation and hot blast furnace flue gas purification combined treatment method provided by the embodiment of the application comprises the steps of piling and airing blast furnace slag with the water content of about 25% after blast furnace treatment in a blast furnace slag yard and an indoor yard until the water content is reduced to 15-20%, conveying the air-dried blast furnace slag to a raw material bin 100 for storage by using a belt conveyor 110, conveying the blast furnace slag in the raw material bin 100 to a vertical pulverizer 120 through a slag quantitative feeder 130 connected with the bottom, grinding and pulverizing the slag in the vertical pulverizer 120 to prepare blast furnace slag micropowder, conveying hot blast furnace flue gas into the vertical pulverizer 120 through a hot blast furnace flue gas pipeline 140 communicated with a blast furnace hot blast furnace 500, drying the pulverized blast furnace slag micropowder in the vertical pulverizer 120 by using hot blast furnace flue gas, reducing the water content of the blast furnace slag micropowder discharged by the vertical pulverizer 120 to 1%, and finally obtaining proper particles after pulverizationThe fine powder of the degree is discharged out of the vertical pulverizer 120 and enters a bag dust collector 150 communicated with a discharge hole of the vertical pulverizer 120, the bag dust collector 150 is used for collecting fine powder of blast furnace slag and then is conveyed to a fine ore bin 160 for storage by a fine powder conveying device 170 communicated with the bottom of the bag dust collector 150, meanwhile, the flue gas filtered by the bag dust collector 150 is pressurized by a draught fan 200 and then is discharged through a smoke exhaust pipe 190 into a chimney 180, when the vertical pulverizer 120 breaks down or is stopped for maintenance repair, a third cut-off valve 390 on a flue gas conveying pipe 380 between a flue gas preprocessor 210 and the vertical pulverizer 120 is controlled to be cut off, and a second cut-off valve 370 on a communication connecting pipe 360 between a flue gas pipeline 140 of a hot blast furnace and a baking soda desulfurization reactor 350 is controlled to ensure that the flue gas conveyed by the flue gas pipeline 140 of the hot blast furnace is conveyed into the baking soda desulfurization reactor 350 through the connecting pipe 360 instead of the flue gas preprocessor the vertical pulverizer 210, and the baking soda quantitative feeder 330 is utilized to crush the baking soda bin 320 to 20-30 mu m and then is conveyed to the baking soda desulfurization reactor 350, SO that the flue gas is mixed with the baking soda flue gas for reaction 2 Reacting to form Na 2 SO 4 After desulfurization, the mixture is conveyed to the cloth bag dust collector 150 through the conveying pipe 340, and Na is recovered and conveyed by the recovery conveying device 440 connected with the cloth bag dust collector 150 2 SO 4 Is conveyed to a sodium sulfate powder bin 450 for storage, and the dust concentration of the flue gas filtered by the bag dust collector 150 is less than or equal to 10mg/Nm 3 ，SO 2 The content is less than or equal to 35mg/Nm 3 Pressurized by the induced draft fan 200 and discharged from the chimney 180.
Example 4
As shown in fig. 7 and 8, the present application provides a combined treatment method for preparing blast furnace slag micropowder and purifying flue gas from a hot blast stove, which uses a blast furnace slag micropowder preparation and purifying flue gas from a hot blast stove according to embodiment 2, and the present application is different from the blast furnace slag micropowder preparation and purifying flue gas from a hot blast stove according to embodiment 2 in that the present application further comprises a gas preheater 400, an air preheater 410, a heating furnace 420, and a hot air duct 430 communicating the heating furnace 420 with the flue gas duct 380, wherein one end of the gas preheater 400 and the air preheater 410 is communicated with the flue gas preprocessor 210, and the other end is communicated with the blast furnace hot blast stove 500.
The blast furnace slag micropowder preparation and hot blast furnace flue gas purification combined treatment method provided by the embodiment of the application is that after blast furnace slag with the water content of about 25% is piled and aired in a blast furnace slag yard and an indoor yard until the water content is reduced to 15-20%, the aired blast furnace slag is conveyed to a raw material bin 100 for storage by a belt conveyor 110, then the blast furnace slag in the raw material bin 100 is conveyed to a vertical pulverizer 120 by a slag quantitative feeder 130 connected with the bottom, the slag is crushed and crushed in the vertical pulverizer 120 to prepare blast furnace slag micropowder, meanwhile, the blast furnace flue gas is conveyed into the vertical pulverizer 120 by a gas preheater 400 and an air preheater 410 which are communicated with a blast furnace hot blast furnace 500, and the blast furnace flue gas is conveyed into the vertical pulverizer 120 by a hot blast furnace flue gas pipeline 140, the water content of the blast furnace slag micropowder discharged from the vertical pulverizer 120 is reduced to about 1%, the micropowder with proper granularity after pulverization is finally discharged from the vertical pulverizer 120, enters a bag dust collector 150 communicated with a discharge hole of the vertical pulverizer 120, the bag dust collector 150 captures the blast furnace slag micropowder and then is transported to a powder ore bin 160 for storage by a micropowder conveying device 170 communicated with the bottom of the bag dust collector 150, simultaneously, the flue gas filtered by the cloth bag dust collector 150 is pressurized by the induced draft fan 200 and then is led into the chimney 180 through the smoke exhaust pipe 190 to be exhausted, the flue gas of the hot blast stove at 280-320 ℃ in the hot blast stove 500 is divided into two paths by arranging the gas preheater 400 and the air preheater 410 which are communicated with the hot blast stove 500, one path of flue gas is preheated to more than 180 ℃ by the gas preheater 400, the other path of flue gas is preheated to more than 180 ℃ by the combustion air by the air preheater 410, thereby raising the temperature of the gas and the combustion air introduced into the blast furnace hot blast stove 500 to raise the stove temperature, and simultaneously, delivering the hot blast stove flue gas which is reduced to 190-200 ℃ by the gas preheater 400 and the air preheater 410 to the flue gas preprocessor 210 through the hot blast stove flue gas pipeline 140 to be sprayed by the spraying device 220, SO that the water mist and SO in the hot blast stove flue gas 2 Reaction to produce H 2 SO 3 Heating air to 600-800 deg.C with heating furnace 420, and delivering the heated airThe flue gas conveyed to the flue gas conveying pipe 380 by the conveying pipe 430 and the outlet of the flue gas preprocessor 210 are mixed and heated to 280-300 ℃, and then the mixed flue gas is introduced into the vertical pulverizer 120 to carry out turbulent drying on the blast furnace slag micropowder, wherein CaO in the slag micropowder and H in the flue gas are dried in the drying process 2 SO 3 CaSO3 generated by full contact reaction plays a role in flue gas desulfurization, and ensures SO at the outlet of a chimney 2 The concentration is less than or equal to 35mg/Nm 3 。
In other alternative embodiments, the micro powder conveyor 170 and the recovery conveyor 440 may also be air chute-fitted bucket elevators.
The embodiments described above are some, but not all embodiments of the application. The detailed description of the embodiments of the application is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Claims (9)
1. The combined treatment method for preparing the blast furnace slag micropowder and purifying the hot blast stove smoke is characterized by comprising the following steps of:
conveying the blast furnace slag after the blast furnace treatment to a pulverizer to pulverize into blast furnace slag micropowder, conveying hot blast furnace flue gas of a blast furnace hot blast furnace into the pulverizer to dry the blast furnace slag micropowder, and mixing and reacting the blast furnace slag micropowder to remove sulfur dioxide in the hot blast furnace flue gas;
and collecting the blast furnace slag micropowder discharged by the pulverizer by using a bag dust collector, conveying the blast furnace slag micropowder to a powder ore bin for storage, pressurizing hot blast furnace flue gas filtered by the bag dust collector, and discharging the flue gas through a chimney.
2. The combined blast furnace slag powder production and hot blast stove flue gas cleaning treatment method according to claim 1, characterized in that water mist is sprayed into the hot blast stove flue gas before the hot blast stove flue gas is conveyed to the pulverizer.
3. The method for combined treatment of blast furnace slag powder preparation and flue gas purification of a hot blast furnace according to claim 1, wherein slaked lime is added to a pulverizer when blast furnace slag after blast furnace treatment is fed to the pulverizer to pulverize into blast furnace slag powder.
4. A blast furnace slag unit production and hot blast stove flue gas cleaning combined treatment method according to claim 3, characterized in that when slaked lime is added to the pulverizer, unreacted complete slaked lime discharged from the pulverizer is collected by using the bag collector and conveyed back to the pulverizer by using an air chute.
5. The combined treatment method for preparing blast furnace slag micropowder and purifying hot blast stove flue gas according to claim 1, further comprising the steps of: and crushing sodium bicarbonate, putting the crushed sodium bicarbonate into the cloth bag dust collector, enabling hot blast stove flue gas entering the cloth bag dust collector to react with sodium bicarbonate micro powder to remove sulfur dioxide, collecting sodium sulfide generated by the reaction by using the cloth bag dust collector, and conveying the sodium sulfide to a sodium sulfate powder bin for storage.
6. The method for combined treatment of blast furnace slag micropowder preparation and hot blast stove flue gas purification according to claim 5, wherein sodium bicarbonate is crushed and then put into the bag collector through a sodium bicarbonate desulfurization reactor, and the hot blast stove flue gas is introduced into the sodium bicarbonate desulfurization reactor, so that the hot blast stove flue gas and the crushed sodium bicarbonate are mixed and reacted in the sodium bicarbonate desulfurization reactor and then enter the bag collector.
7. The combined treatment method for preparing blast furnace slag micropowder and purifying the flue gas of the hot blast stove according to claim 1, wherein the flue gas of the hot blast stove is cooled to 190-200 ℃ through a gas preheater and an air preheater respectively, then is introduced into the pulverizer, and the gas and the air which reach more than 180 ℃ after being preheated in the gas preheater and the air preheater are introduced into the blast furnace hot blast stove.
8. The combined blast furnace slag powder production and hot blast stove flue gas cleaning treatment method according to claim 7, wherein the air heated to 600-800 ℃ is mixed with the hot blast stove flue gas before being introduced into the pulverizer after heating the air by using a heating furnace, so that the temperature of the flue gas introduced into the pulverizer is 280-300 ℃.
9. The method for combined treatment of blast furnace slag micropowder production and flue gas purification in hot blast stove according to claim 1, wherein blast furnace slag after blast furnace treatment is dried until the moisture content is reduced to 20% or less and then conveyed to the pulverizer for pulverization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311044916.2A CN117065909A (en) | 2023-08-17 | 2023-08-17 | Combined treatment method for preparing blast furnace slag micropowder and purifying flue gas of hot blast stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311044916.2A CN117065909A (en) | 2023-08-17 | 2023-08-17 | Combined treatment method for preparing blast furnace slag micropowder and purifying flue gas of hot blast stove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117065909A true CN117065909A (en) | 2023-11-17 |
Family
ID=88703705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311044916.2A Pending CN117065909A (en) | 2023-08-17 | 2023-08-17 | Combined treatment method for preparing blast furnace slag micropowder and purifying flue gas of hot blast stove |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117065909A (en) |
-
2023
- 2023-08-17 CN CN202311044916.2A patent/CN117065909A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101559323B (en) | Digestive circulating fluid bed flue gas desulfurization method and device | |
| CN206746767U (en) | A kind of desulfurization agstone preparation system | |
| CN101870897B (en) | Process for carrying out strengthening circulation, stage grinding and quality improvement on lignite by utilizing superheated steam and system thereof | |
| CN105773834B (en) | Ceramic raw material point mill centralized system is for Processes and apparatus | |
| CN204865475U (en) | Coal -fired power plant boiler flue gas desulphurization device | |
| WO2010139168A1 (en) | Digestion circulating fluidized bed flue gas desulfurization method and device | |
| CN104086107A (en) | Method of comprehensively utilizing precipitator ash and slag of calcium carbide furnace | |
| CN105276576B (en) | A kind of coal desulfurization technique | |
| CN110923461A (en) | Method and device for treating fly ash | |
| CN102363095B (en) | Dry flue gas desulfurization process method and dry flue gas desulfurization system thereof | |
| CN109423558A (en) | A kind of technique of municipal administration and metallurgical difficult solid waste collaboration resource utilization | |
| CN110605014A (en) | Dry-method desulfurizer production process and system | |
| CN110274463A (en) | A kind of pure sintering system and method based on fuel formulations and roasting control | |
| CN201427021Y (en) | Flue gas desulfurization device for digestive and circulating fluidized bed | |
| CN101265041A (en) | Technique for using dry discharging carbide slag to completely substitute natural calcareous raw material for producing cement chamotte | |
| CN105107366B (en) | A kind of concurrent spray semi-dry fume desulfuration method | |
| CN107754591A (en) | A kind of high-efficient atomizing desulfurizer and method | |
| CN112675691B (en) | Flue gas semi-dry desulfurization system and desulfurization method | |
| CN201246739Y (en) | Drying carbide slag desulfuration system on circulating fluid bed boiler | |
| CN201753345U (en) | Superheated steam reinforced circulation graded crushing upgrading system for lignite | |
| CN117065909A (en) | Combined treatment method for preparing blast furnace slag micropowder and purifying flue gas of hot blast stove | |
| CN209519577U (en) | A kind of cement rotary kiln dry fog desulphurization system | |
| CN104326498A (en) | Device utilizing high-temperature flue gas with high CO2 content to produce ultrafine active calcium powder and production method thereof | |
| CN220597334U (en) | Blast furnace slag micropowder preparation and hot-blast furnace flue gas purification treatment system | |
| CN117125914A (en) | Blast furnace slag micropowder preparation and hot-blast furnace flue gas purification treatment system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |