CN117125914A - Blast furnace slag micropowder preparation and hot-blast furnace flue gas purification treatment system - Google Patents

Blast furnace slag micropowder preparation and hot-blast furnace flue gas purification treatment system Download PDF

Info

Publication number
CN117125914A
CN117125914A CN202311043734.3A CN202311043734A CN117125914A CN 117125914 A CN117125914 A CN 117125914A CN 202311043734 A CN202311043734 A CN 202311043734A CN 117125914 A CN117125914 A CN 117125914A
Authority
CN
China
Prior art keywords
blast furnace
flue gas
conveying
hot
fume
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
Application number
CN202311043734.3A
Other languages
Chinese (zh)
Inventor
王涛
杨智强
曹勇
杨辉合
程骞
王晶
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wiscodri Wugang Engineering Co ltd
Original Assignee
Wiscodri Wugang Engineering Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Wiscodri Wugang Engineering Co ltd filed Critical Wiscodri Wugang Engineering Co ltd
Priority to CN202311043734.3A priority Critical patent/CN117125914A/en
Publication of CN117125914A publication Critical patent/CN117125914A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/04—Heat treatment
    • 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
    • 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
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/141—Slags

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Civil Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Treating Waste Gases (AREA)

Abstract

A blast furnace slag micropowder preparation and hot-blast stove flue gas purification treatment system relates to the field of resource recycling. The blast furnace slag micropowder preparation and hot-blast furnace fume purification treatment system comprises a raw material bin, a belt conveyor for conveying blast furnace granulated slag to the raw material bin, a vertical pulverizer for grinding the blast furnace granulated slag, a slag quantitative feeder for conveying materials in the raw material bin to the vertical pulverizer, a hot-blast furnace fume pipeline for conveying fume of the blast furnace hot-blast furnace into the vertical pulverizer, a bag dust collector for receiving ground products of the vertical pulverizer, a powder ore bin, a micropowder conveying device for conveying micropowder collected by the bag dust collector to the powder ore bin, a chimney, a fume discharge pipe for conveying fume purified by the bag dust collector to the chimney, and a draught fan for pressurizing fume in the fume discharge pipe. The blast furnace slag micropowder preparation and hot-blast stove flue gas purification treatment system adopts blast furnace hot-blast stove flue gas to dry slag micropowder and utilizes slag micropowder to desulfurize hot-blast stove flue gas, thereby saving energy consumption and reducing carbon emission.

Description

Blast furnace slag micropowder preparation and hot-blast furnace flue gas purification treatment system
Technical Field
The application relates to the field of resource recycling, in particular to a blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system and method.
Background
The blast furnace slag raw material has low added value, can only be piled up in a factory to occupy land resources, and the slag can be piled up for a long time to form a large amount of hardening to become waste without utilization value, and simultaneously, the blast furnace slag raw material is easy to pollute the environment, thereby bringing great pressure to environmental protection work. The slag micropowder is superfine powder obtained by grinding blast furnace slag, has ultrahigh activity, and can be used as a high-quality admixture for cement and concrete to improve the added value of slag. The resource utilization of slag meets the national resource conservation and environmental protection requirements.
But the grinding and drying hot air is mainly provided by a coal-fired or gas-fired heating furnace during slag micropowder processing, so that the energy consumption is high and the CO is high 2 The discharge amount is large, secondary flue gas generated by the heating furnace needs to be further treated, and the coal consumption per year is 13455t by taking 60 ten thousand tons of micropowder process production (coal-fired heating furnace) as an example, the energy consumption is huge, and the generated CO is high 2 About 36300t/a, SO 2 About 114t/a, NO x About 100t/a.
The flue gas of the blast furnace hot blast stove has the characteristic of low pollutant emission concentration, and is common SO 2 The content is 150mg/Nm 3 ，NO x The content is 130mg/Nm 3 Dust is less than or equal to 10mg/Nm 3 About, the regulation prescribes that the ultra-low emission index limit value of the blast furnace hot blast stove is as follows: the particle content is less than or equal to 10mg/Nm 3 ，SO 2 ≤50mg/Nm 3 Nitrogen, nitrogenOxide is less than or equal to 200mg/Nm 3 Namely SO in domestic hot-blast stove flue gas 2 And the desulfurization treatment is required due to general exceeding standard. The domestic hot blast stove has late desulfurization start, and the technology mainly refers to a treatment method of coke oven, sintering, ceramic and cement kiln flue gas. Common treatment processes include SDS nano-base dry desulfurization, fixed bed dry desulfurization, moving bed dry desulfurization and other technologies. Most of the existing desulfurization technologies have the problems of high initial investment and operation cost, high byproduct treatment difficulty, large occupied area and the like, and severely restrict the popularization and application of the hot blast stove desulfurization technology.
Disclosure of Invention
The application aims to provide a blast furnace slag micropowder preparation and hot-blast stove flue gas purification treatment system, which adopts waste heat of blast furnace hot-blast stove flue gas to replace a coal-fired or gas-fired heating furnace as a drying heat source for slag micropowder preparation, and simultaneously utilizes calcium oxide in slag micropowder to remove sulfur dioxide in hot-blast stove flue gas, so that energy consumption can be saved, and carbon and sulfur emission can be reduced.
The application is realized in the following way:
the application provides a blast furnace slag micropowder preparation and hot blast furnace flue gas purification treatment system which comprises a raw material bin for storing blast furnace slag, a belt conveyor for conveying the blast furnace slag to the raw material bin, a vertical pulverizer for grinding the blast furnace slag, a slag quantitative feeder for conveying materials in a raw material bin to the vertical pulverizer, a hot blast furnace flue gas pipeline for conveying flue gas of the blast furnace hot blast furnace to the vertical pulverizer, a bag dust collector for receiving ground products of the vertical pulverizer, a powder bin, a micropowder conveying device for conveying micropowder collected by the bag dust collector to the powder bin, a chimney, a smoke discharge pipe for conveying purified flue gas of the bag dust collector to the chimney and a draught fan for pressurizing flue gas in the smoke discharge pipe.
In some alternative embodiments, a flue gas preprocessor is arranged between the vertical pulverizer and the flue gas pipeline of the hot blast stove, and a spraying device is arranged in the flue gas preprocessor.
In some alternative embodiments, the lime mixer further comprises a lime bin, a slaked lime reactor for receiving lime in the lime bin, and a screw feeder for conveying materials in the slaked lime reactor to a feed inlet of the vertical pulverizer, wherein the slaked lime reactor is connected with a stirring device and a water adding pipe.
In some alternative embodiments, the bottom of the bag house is connected with an air chute through a return pipe, the air chute being used for conveying the material in the return pipe to the vertical pulverizer, the return pipe being provided with a first shut-off valve.
In some alternative embodiments, the system further comprises a baking soda silo, a baking soda mill for comminuting baking soda, a baking soda dosing machine for delivering the material in the baking soda silo to the baking soda mill comminution, and a delivery pipe for delivering the baking soda mill comminution material to the bag house.
In some alternative embodiments, a baking soda desulfurization reactor is arranged between the baking soda mill and the conveying pipe, a flue gas pipeline of the hot blast stove is communicated with the baking soda desulfurization reactor through a connecting pipe, a second cut-off valve for controlling the opening and closing of the connecting pipe is arranged on the connecting pipe, and the flue gas preprocessor is communicated with the vertical pulverizer through a flue gas conveying pipe provided with a third cut-off valve; the cloth bag dust collector is also communicated with a sodium sulfate powder bin through a recovery conveying device.
In some alternative embodiments, the system further comprises a gas preheater and an air preheater, wherein one end of the gas preheater and one end of the air preheater are communicated with the flue gas preprocessor, and the other end of the gas preheater are communicated with the blast furnace hot blast stove.
In some alternative embodiments, the device further comprises a heating furnace and a hot air conveying pipe communicated with the heating furnace and the flue gas conveying pipe.
The beneficial effects of the application are as follows: the application provides a blast furnace slag micropowder preparation and hot blast furnace fume purification treatment system which comprises a raw material bin for storing blast furnace slag, a belt conveyor for conveying the blast furnace slag to the raw material bin, a vertical pulverizer for grinding the blast furnace slag, a slag quantitative feeder for conveying materials in a raw material bin to the vertical pulverizer, a hot blast furnace fume pipeline for conveying fume of the blast furnace hot blast furnace into the vertical pulverizer, a bag dust collector for receiving ground products of the vertical pulverizer, a powder ore bin, a micropowder conveying device for conveying micropowder collected by the bag dust collector to the powder ore bin, a chimney, a fume exhaust pipe for conveying fume purified by the bag dust collector to the chimney, and a draught fan for pressurizing fume in the fume exhaust pipe. The blast furnace slag micropowder preparation and hot-blast stove flue gas purification treatment system provided by the application adopts the waste heat of the blast furnace hot-blast stove flue gas to replace a coal-fired or gas-fired heating furnace as a drying heat source for slag micropowder preparation, and simultaneously utilizes calcium oxide in the slag micropowder to remove sulfur dioxide in the hot-blast stove flue gas, so that energy consumption can be saved, and carbon and sulfur emission can be reduced.
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 diagram of a blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system provided in embodiment 1 of the present application;
fig. 2 is a schematic structural diagram of a blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system provided in embodiment 2 of the present application;
FIG. 3 is a schematic diagram of a blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system according to embodiment 3 of the present application;
fig. 4 is a schematic structural diagram of a blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system provided in embodiment 4 of the present 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 treatment system of the present application are described in further detail below with reference to examples.
Example 1
As shown in fig. 1, the present application provides a blast furnace slag micropowder preparation and hot blast furnace fume purification treatment system, which comprises 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 hot blast furnace fume pipe 140 for conveying hot blast furnace fume discharged from a blast furnace hot blast furnace 500 to the vertical pulverizer 120, a bag dust collector 150 for receiving ground mineral products of the vertical pulverizer 120, a dust bin 160, a micropowder conveying device 170 for conveying micropowder collected by the bag dust collector 150 to the dust bin 160, a chimney 180, a fume exhaust pipe 190 for conveying fume purified by the bag dust collector 150 to the chimney 180, and a draught fan 200 for pressurizing fume in the fume exhaust pipe 190, wherein a fume preprocessor 210 is arranged between the vertical pulverizer 120 and the fume pipe 140, and a sprayer 220 is arranged in the fume preprocessor 210; the fine powder conveying device 170 in this embodiment is a pneumatic conveying device. Wherein, the top discharge end of the belt conveyor 110 is located above the top opening of the raw material bin 100, the feed inlet and the discharge outlet of the slag quantitative feeder 130 are respectively connected with the bottom outlet of the raw material bin 100 and the top inlet of the vertical pulverizer 120, the two ends of the hot blast stove flue gas pipeline 140 are respectively connected with the flue gas outlet of the blast furnace hot blast stove 500 and the bottom inlet of the vertical pulverizer 120, the top inlet of the bag dust collector 150 is connected with the top outlet of the vertical pulverizer 120, the top inlet and the bottom outlet of the micro powder conveying device 170 are respectively connected with the bottom outlet of the bag dust collector 150 and the top inlet of the powder bin 160, and the two ends of the smoke exhaust pipe 190 are respectively communicated with the top flue gas outlet of the bag dust collector 150 and the bottom of the chimney 180.
The working principle of the blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system provided by the embodiment of the application is as follows: after the blast furnace water slag with the water content of about 25% after blast furnace treatment is piled and aired in a blast furnace water slag storage yard and an indoor storage yard until the water content is reduced to 15-20%, the aired blast furnace water slag is conveyed to a raw material bin 100 for storage by using a belt conveyor 110, and the blast furnace water slag in the raw material bin 100 is conveyed to a vertical pulverizer 120 through a slag quantitative feeder 130 connected with the bottom, so that slag is in a vertical stateGrinding and crushing in a pulverizer 120, conveying hot blast furnace flue gas into the vertical pulverizer 120 by using a hot blast furnace flue gas pipeline 140 communicated with a blast furnace hot blast furnace 500, drying pulverized slag micropowder in the vertical pulverizer 120 by using hot blast furnace flue gas, reducing the water content of the slag micropowder in the vertical pulverizer 120 to about 1%, finally discharging the pulverized micropowder with proper granularity out of the vertical pulverizer 120, entering a cloth bag dust collector 150 communicated with a discharge port of the vertical pulverizer 120, finally enabling the cloth bag dust collector 150 to collect the micropowder, conveying the micropowder to a powder bin 160 for storage by using a micropowder conveying device 170 communicated with the bottom of the cloth bag dust collector 150, pressurizing the flue gas filtered by the cloth bag dust collector 150 by using a draught fan 200, and then introducing the fume into a chimney 180 for discharge by using a fume discharge pipe 190, wherein the dust concentration 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 the flue gas preprocessor 210 for spray treatment through the hot blast stove flue gas pipeline 140, and the spray device 220 is used for spraying water mist into the flue gas preprocessor 210, SO that the water mist and SO in the hot blast stove flue gas 2 Reaction to produce H 2 SO 3 Then the slag powder is introduced into a vertical pulverizer 120 to lead CaO in slag powder and H in 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 this embodiment, the filtering wind speed of the bag filter 150 is less than or equal to 0.65m/min, and the concentration of the outlet flue gas dust is less than or equal to 10mg/Nm 3 Meets the ultra-low emission requirement.
Example 2
As shown in fig. 2, the embodiment of the present application provides a blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system, which has the same structure as the blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system provided in embodiment 1, and is different in that in the present embodiment, the system 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 a 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 dust collector 150 is connected with an air chute 290 through a return pipe 280, the air chute 290 is used for conveying materials in the return pipe 280 to the vertical pulverizer 120, and the return pipe 280 is provided with a first stop valve 300; wherein the slaked lime reactor 240 is provided below the lime bin 230 to receive lime.
The embodiment of the application provides a blast furnace slag micropowder preparation and hot-blast furnace flue gas purification treatment system, which is characterized in that lime is stored in a lime bin 230 by arranging the lime bin 230, lime stored in the lime bin 230 is received by a slaked lime reactor 240 arranged below the lime bin 230, water is added into the slaked lime reactor 240 by a water adding pipe 270, the slaked lime is obtained by stirring reaction by a stirring device 260, and then the slaked lime in the slaked lime reactor 240 is conveyed into a vertical pulverizer 120 by 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 production is not needed, the slag quantitative feeder 130 can be controlled to stop conveying 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 slaked lime with limited reaction time cannot be completely reacted, the first cut-off valve 300 is controlled to be opened, so that part of the slaked lime collected at the bottom of the bag collector 150 is conveyed into the vertical pulverizer 120 again through the return pipe 280 and the air chute 290 for sulfur removal reaction, and the other part of the slaked lime is conveyed into the fine powder bin 160 for storage through the micro powder conveying device 170.
Example 3
As shown in fig. 3, the embodiment of the present application provides a blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system, which has the same structure as the blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system provided in embodiment 1, and is different in that in the present embodiment, the blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system further comprises a baking soda silo 310, a baking soda mill 320 for crushing baking soda, a baking soda dosing machine 330 for conveying the material in the baking soda silo 310 to the baking soda mill 320 for crushing, and a conveying pipe 340 for conveying the crushed material of the baking soda mill 320 to a bag dust collector 150, a baking soda desulfurization reactor 350 is arranged between the baking soda mill 320 and the conveying pipe 340, the hot blast stove flue gas pipeline 140 is communicated 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 baking soda silo is arranged on the connecting pipe 360, and the flue gas pretreatment device 210 is communicated with the vertical pulverizing mill 120 through a flue gas conveying pipe 380 provided with a third cut-off valve 390. The cloth bag dust collector 150 is also communicated with a sodium sulfate powder bin 450 through a recovery conveying device 440, and in the embodiment, the recovery conveying device 440 is a pneumatic conveying device; wherein, the inlet and the outlet of the baking soda dosing machine 330 are respectively connected with the bottom outlet of the baking soda bin 310 and the top inlet of the baking soda mill 320, and the two ends of the conveying pipe 340 are respectively connected with the bottom outlet of the baking soda mill 320 and the top inlet of the bag dust collector 150.
The embodiment of the application provides a blast furnace slag micropowder preparation and hot blast furnace flue gas purification treatment system, which can ensure that the discharge of hot blast furnace flue gas reaches the standard under the condition that a vertical pulverizer 120 breaks down or is stopped for maintenance and repair, at the moment, 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 cut off, and a second cut-off valve 370 on a connecting pipe 360 is controlled to be communicated between a hot blast furnace flue gas pipeline 140 and a sodium bicarbonate desulfurization reactor 350, SO that the hot blast furnace flue gas conveyed by the hot blast furnace flue gas pipeline 140 does not pass through the flue gas preprocessor 210 and the vertical pulverizer 120, but the hot blast furnace flue gas is conveyed into the sodium bicarbonate desulfurization reactor 350 through the connecting pipe 360, sodium bicarbonate in a sodium bicarbonate storage bin 310 is conveyed to a sodium bicarbonate desulfurization reactor 350 for mixed reaction with the hot blast furnace flue gas after being pulverized by a sodium bicarbonate quantitative feeder 330, SO that sodium bicarbonate and SO in the hot blast furnace flue gas are reacted 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. 4, the embodiment of the present application provides a blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system, which has the same structure as the blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system provided in embodiment 2, and is different in that in this embodiment, a gas preheater 400, an air preheater 410, a heating furnace 420, and a hot air delivery pipe 430 communicating the heating furnace 420 and the flue gas delivery pipe 380 are further included, one end of the gas preheater 400 and one end of the air preheater 410 are 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 stove flue gas purification treatment system provided by the embodiment of the application is provided with a gas preheater 400 and an air preheater 410, the hot blast stove flue gas at 280-320 ℃ in the blast furnace hot blast stove 500 is divided into two paths, one path of the flue gas passes through the gas preheater 400 to preheat the blast furnace hot blast stove 500 to about 180 ℃ by using blast furnace gas, and the other path of the flue gas passes through the air preheater 410 to preheat the blast furnace hot blast stove 500 to about 180 ℃ by using combustion air, so that the temperature of the gas and the combustion air which are introduced into the blast furnace hot blast stove 500 is increased to increase the stove temperature.
Simultaneously, the hot blast stove flue gas which is reduced to 190-200 ℃ through the gas preheater 400 and the air preheater 410 is conveyed to the flue gas preprocessor 210 through the hot blast stove flue gas pipeline 140 and is subjected to spray treatment through the spraying device 220, SO that water mist and SO in the hot blast stove flue gas are formed 2 Reaction to produce H 2 SO 3 The method comprises the steps of carrying out a first treatment on the surface of the Simultaneously, the heating furnace 420 is used for heating air to 600-800 ℃, the air is conveyed to the flue gas conveying pipe 380 through the hot air conveying pipe 430 and is mixed with flue gas at the outlet of the flue gas preprocessor 210, and the mixed flue gas enters the vertical pulverizer 120 to dry separated slag in a turbulent flow, and CaO and flue gas in slag micropowder are dried in the drying processH in the air 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 (8)

1. The blast furnace slag micropowder preparation and hot blast furnace fume purification treatment system is characterized by comprising a raw material bin for storing blast furnace slag, a belt conveyor for conveying blast furnace slag to the raw material bin, a vertical pulverizer for grinding blast furnace slag, a slag quantitative feeder for conveying materials in the raw material bin to the vertical pulverizer, a hot blast furnace fume pipeline for conveying fume of a blast furnace hot blast furnace to the vertical pulverizer, a bag dust collector for receiving ground products of the vertical pulverizer, a powder ore bin, a micropowder conveying device for conveying micropowder collected by the bag dust collector to the powder ore bin, a chimney, a fume discharge pipe for conveying fume purified by the bag dust collector to the chimney, and a draught fan for pressurizing fume in the fume discharge pipe.
2. The blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system according to claim 1, wherein a flue gas pretreatment device is arranged between the vertical pulverizer and the hot blast stove flue gas pipeline, and a spraying device is arranged in the flue gas pretreatment device.
3. The blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system according to claim 1, further comprising a lime bin, a slaked lime reactor for receiving lime in the lime bin and a screw feeder for conveying materials in the slaked lime reactor to a feed inlet of the vertical pulverizer, wherein the slaked lime reactor is connected with a stirring device and a water adding pipe.
4. A blast furnace slag powder preparation and hot blast stove flue gas purification treatment system according to claim 3, wherein the bottom of the bag collector is connected with an air chute through a return pipe, the air chute is used for conveying the material in the return pipe to the vertical pulverizer, and the return pipe is provided with a first cut-off valve.
5. The blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system according to claim 2, further comprising a baking soda silo, a baking soda mill for pulverizing baking soda, a baking soda dosing machine for transporting the materials in the baking soda silo to the baking soda mill for pulverizing, and a transport pipe for transporting the baking soda mill pulverized materials to the bag house.
6. The blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system according to claim 5, wherein a baking soda desulfurization reactor is arranged between the baking soda mill and the conveying pipe, a flue gas pipeline of the hot blast stove is communicated with the baking soda desulfurization reactor through a connecting pipe, a second cut-off valve for controlling the opening and closing of the connecting pipe is arranged on the connecting pipe, and the flue gas preprocessor is communicated with the vertical pulverizer through a flue gas conveying pipe provided with a third cut-off valve; the cloth bag dust collector is also communicated with a sodium sulfate powder bin through a recovery conveying device.
7. The blast furnace slag micropowder preparation and hot blast stove flue gas purification treatment system according to claim 6, further comprising a gas preheater and an air preheater, wherein one end of the gas preheater and one end of the air preheater are communicated with the flue gas preprocessor, and the other end of the gas preheater and the air preheater are communicated with the blast furnace hot blast stove.
8. The blast furnace slag micropowder production and flue gas purification treatment system as recited in claim 7, further comprising a heating furnace and a hot air delivery pipe communicating the heating furnace and the flue gas delivery pipe.
CN202311043734.3A 2023-08-17 2023-08-17 Blast furnace slag micropowder preparation and hot-blast furnace flue gas purification treatment system Pending CN117125914A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311043734.3A CN117125914A (en) 2023-08-17 2023-08-17 Blast furnace slag micropowder preparation and hot-blast furnace flue gas purification treatment system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311043734.3A CN117125914A (en) 2023-08-17 2023-08-17 Blast furnace slag micropowder preparation and hot-blast furnace flue gas purification treatment system

Publications (1)

Publication Number Publication Date
CN117125914A true CN117125914A (en) 2023-11-28

Family

ID=88850146

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311043734.3A Pending CN117125914A (en) 2023-08-17 2023-08-17 Blast furnace slag micropowder preparation and hot-blast furnace flue gas purification treatment system

Country Status (1)

Country Link
CN (1) CN117125914A (en)

Similar Documents

Publication Publication Date Title
CN101559323B (en) Digestive circulating fluid bed flue gas desulfurization method and device
CN104759203A (en) Fluidized bed process and system for directly capturing carbon dioxide in mineralized flue gas
CN104086107A (en) Method of comprehensively utilizing precipitator ash and slag of calcium carbide furnace
CN101220312A (en) Combustion improver for catalytic combustion of blast furnace coal injection
CN101987783A (en) Method for producing active pulverized lime by utilizing coal gas to calcine limestone through suspended state pre-heating decomposing furnace
CN103344114B (en) A kind of novel energy-saving emission-reducing sintering machine system and sintering method
CN110605014A (en) Dry-method desulfurizer production process and system
CN108525508A (en) The method for carrying out flue gas desulfurization using cement slurry
CN201427021Y (en) Flue gas desulfurization device for digestive and circulating fluidized bed
CN102363095A (en) Dry flue gas desulfurization process method and dry flue gas desulfurization system thereof
CN110274463A (en) A kind of pure sintering system and method based on fuel formulations and roasting control
CN101265041A (en) Technique for using dry discharging carbide slag to completely substitute natural calcareous raw material for producing cement chamotte
CN209519577U (en) A kind of cement rotary kiln dry fog desulphurization system
CN108502884A (en) A method of producing the grey mix and convert calcium lime powder pressure ball molding of calcium carbide furnace of calcium carbide purification
CN112675691B (en) Flue gas semi-dry desulfurization system and desulfurization method
CN219530903U (en) Comprehensive utilization system taking coal gangue as fuel
CN111850291B (en) Pretreatment method of sintered solid fuel and preparation method of sintered mixture
CN220597334U (en) Blast furnace slag micropowder preparation and hot-blast furnace flue gas purification treatment system
CN105586498B (en) The method of efficient step fork fraction rotary reduction furnace direct-reduction production ferronickel
CN104326498A (en) Device utilizing high-temperature flue gas with high CO2 content to produce ultrafine active calcium powder and production method thereof
CN117125914A (en) Blast furnace slag micropowder preparation and hot-blast furnace flue gas purification treatment system
CN109455960A (en) A kind of process of preparing and production equipment of slag micropowder
CN214382643U (en) Dry quenching flue gas desulfurization device
CN117065909A (en) Combined treatment method for preparing blast furnace slag micropowder and purifying flue gas of hot blast stove
CN211620349U (en) Steel mill sludge 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