CN110605021A - Humidification-activated desulfurization, denitrification and dust removal system and treatment method using same - Google Patents

Humidification-activated desulfurization, denitrification and dust removal system and treatment method using same Download PDF

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Publication number
CN110605021A
CN110605021A CN201911051023.4A CN201911051023A CN110605021A CN 110605021 A CN110605021 A CN 110605021A CN 201911051023 A CN201911051023 A CN 201911051023A CN 110605021 A CN110605021 A CN 110605021A
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China
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desulfurization
flue gas
denitrification
catalyst slurry
compressed air
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Inventor
孙彦良
司硕
秦胜
杨晓辉
田莉雅
冯强
王海苗
谭波
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Yanzhou Mining Technology Co Ltd
Yankuang Group Corp Ltd
Yanzhou Coal Mining Co Ltd
Yanzhou Coal Industry Co Ltd
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Yanzhou Mining Technology Co Ltd
Yankuang Group Corp Ltd
Yanzhou Coal Industry Co Ltd
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Priority to CN201911051023.4A priority Critical patent/CN110605021A/en
Publication of CN110605021A publication Critical patent/CN110605021A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8637—Simultaneously removing sulfur oxides and nitrogen 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/88—Handling or mounting catalysts
    • B01D53/885—Devices in general for catalytic purification of waste gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • 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)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention provides a humidification-activated desulfurization, denitrification and dust removal system and a treatment method using the same, wherein the desulfurization, denitrification and dust removal system comprises a desulfurization, denitrification and dust removal device, the desulfurization, denitrification and dust removal device comprises a desulfurization and denitrification reaction chamber and a settling chamber which are communicated up and down along the flow direction of flue gas, and the barrel part of the desulfurization and denitrification reaction chamber extends into the settling chamber; the top of the desulfurization and denitrification reaction chamber is provided with a two-fluid injection device, and the two-fluid injection device is used for injecting catalyst slurry and compressed air into the desulfurization and denitrification reaction chamber. Spraying the desulfurization and denitrification catalyst slurry by atomization to remove SO in the flue gas2Absorption of NOxConversion to nitrate or reduction to N2The contact area of the flue gas and the catalyst slurry is increased after the flue gas is contacted with the atomized particles formed by the catalyst slurry, the agglomeration of the smoke particles is facilitated, and the agglomerated smoke particles enable dust particles in the flue gas to freely settle through the settling chamber, so that the functions of desulfurization, denitration and dust removal are achieved at the same time.

Description

Humidification-activated desulfurization, denitrification and dust removal system and treatment method using same
Technical Field
The invention belongs to the technical field of flue gas purification, and relates to a desulfurization, denitrification and dust removal system and a treatment method using the same, in particular to a humidification and activation desulfurization, denitrification and dust removal system and a treatment method using the same.
Background
At present, in the application of boiler flue gas treatment, most of desulfurization, denitration and dust removal are independent application systems, the commonly used desulfurization technology is the technologies of desulfurization in a mixing furnace of raw materials and a desulfurizing agent, calcium spraying in the furnace, wet desulfurization and the like, the commonly used denitration technology is the technologies of SNCR, SCR, COA, low-temperature catalyst denitration and the like, the commonly used dust removal technology is the technologies of bag dust removal, electric bag composite dust removal and the like, most of the existing humidifying activation towers spray water, particulate matter is agglomerated to reduce dust, the flue gas is of a high-inlet low-outlet structure, only the flue gas is treated, and the above technologies only can be used for SO2、NOxAnd one of the dust is removed, and the method has the different defects of wide occupied area, large investment, high operation and maintenance cost and the like.
CN104785078A discloses a flue gas purification device for humidifying and activating circulating ash in a furnace after a calcium spraying furnace in the furnace, which comprises a furnace calcium spraying system, a furnace humidifying and activating system and a circulating ash system; the in-furnace calcium spraying system comprises a lime powder storage bin, a lime powder metering bin, a rotary feeder, a jet pump, a limestone conveying and air distributing machine and a heating fan; the furnace rear humidification and activation system comprises a humidification and activation tower, an atomization spray gun, a process water control system and a water supply tank; the circulating ash system comprises a desulfurizing tower, a bag-type dust collector, a return ash chute and a new lime powder feeding conveying pipe; the discharge port of the new lime powder feeding conveying pipe is connected to the new lime powder feeding port of the desulfurizing tower through the feeding pipe.
CN206881509U discloses a desulfurization, denitrification and dedusting integrated device, which comprises a rectangular box body, wherein an air inlet pipe is arranged on the left side of the rectangular box body, an air outlet pipe is arranged on the right side of the rectangular box body, a first vertical partition plate and a second vertical partition plate are arranged in the rectangular box body, the inner cavity of the rectangular box body is divided into a dedusting cavity, a denitrification cavity and a desulfurization cavity by the first partition plate and the second partition plate, a filter frame is arranged in the dedusting cavity, a vertical filter screen is arranged on the filter frame, heating wires are pre-embedded in the first partition plate and the second partition plate, a heat insulation layer is connected to one side of the first partition plate and the second partition plate, which is far away from the denitrification cavity, a first air guide pipe communicated with the dedusting cavity and the denitrification cavity is arranged on the upper side of the first partition plate, a second air guide pipe communicated with the denitrification cavity and the desulfurization cavity is arranged on the, the washing intracavity is equipped with the washing liquid, and the second end of air duct stretches into under the washing liquid level, and three upside of baffle are equipped with air duct three, are equipped with an aqueous ammonia nozzle on the rectangle box at desulfurization minute chamber top.
CN204478093U discloses a multi-bend gas purification system, which comprises a multi-bend, a dust-containing gas inlet and a dust-removing gas outlet; partition walls are arranged on the upper wall and the lower wall or the left wall and the right wall of the multiple bends at intervals; the multi-bend pipeline is provided with a burner, the lower part of the multi-bend pipeline is provided with a slag pool, the slag pool is of a conical structure, and the slag pool is connected with a slag outlet; the dust-containing gas inlet is connected with a factory boiler tail gas system, and the dust-removing gas outlet is connected with a waste heat power generation system; the multiple bends are provided with viscous low-melting-point material nozzles, and the viscous low-melting-point material nozzles are positioned on the upper parts or the side walls of the multiple bends.
In summary, there is no integrated purification treatment system for performing desulfurization, denitrification and dust removal on boiler flue gas, and therefore, it is urgently needed to design a treatment system for performing desulfurization, denitrification and dust removal on boiler flue gas.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a humidifying and activating desulfurization, denitrification and dust removal system and a treatment method using the same2Absorption of NOxConversion to nitrate or reduction to N2The contact area of the flue gas and the catalyst slurry is increased after the flue gas is contacted with the atomized particles formed by the catalyst slurry, the agglomeration of the smoke particles is facilitated, and the agglomerated smoke particles enable dust particles in the flue gas to freely settle through the settling chamber, so that the functions of desulfurization, denitration and dust removal are achieved at the same time.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a humidification-activated desulfurization, denitrification and dust removal system, which comprises a desulfurization, denitrification and dust removal device, wherein the desulfurization, denitrification and dust removal device comprises a desulfurization, denitrification reaction chamber and a settling chamber which are communicated up and down along the flow direction of flue gas, and a barrel body part of the desulfurization, denitrification reaction chamber extends into the settling chamber.
The top of the desulfurization and denitrification reaction chamber is provided with a two-fluid injection device, and the two-fluid injection device is used for injecting catalyst slurry and compressed air into the desulfurization and denitrification reaction chamber.
Spraying the desulfurization and denitrification catalyst slurry by atomization to remove SO in the flue gas2Absorption of NOxConversion to nitrate or reduction to N2The contact area of the flue gas and the catalyst slurry is increased after the flue gas is contacted with the atomized particles formed by the catalyst slurry, and the agglomeration of the flue gas particles is facilitated, and the agglomerated flue gas particlesThe dust particles in the flue gas can be freely settled through the settling chamber, so that the functions of desulfurization, denitration and dust removal can be achieved simultaneously.
According to a preferable technical scheme of the invention, the height of the cylinder body of the desulfurization and denitrification reaction chamber extending into the settling chamber part accounts for 1/3-1/2 of the overall height of the desulfurization and denitrification reaction chamber.
As a preferable technical scheme of the invention, the upper part of the desulfurization and denitrification reaction chamber is provided with a flue gas inlet.
Preferably, a flue gas uniform distribution plate is arranged in the desulfurization and denitrification reaction chamber below the flue gas inlet.
Preferably, the flue gas uniform distribution plate is of an annular structure, the annular outer edge of the flue gas uniform distribution plate is tightly attached to the inner wall of the cylinder of the desulfurization and denitrification reaction chamber, and the annular inner edge of the flue gas uniform distribution plate is tightly attached to the outer wall of the cylinder of the gas inlet pipe; the flue gas is uniformly dispersed by the flue gas uniform distribution plate and then is contacted with the mixed liquid of the compressed air and the catalyst slurry.
As a preferable technical scheme of the invention, the upper part of the settling chamber is provided with at least one flue gas outlet, the flue gas is discharged from the bottom of the desulfurization and denitrification reaction chamber and then is introduced into the settling chamber, and the flue gas turns back upwards after reaching the bottom of the settling chamber and is discharged from the flue gas outlet.
As a preferred embodiment of the present invention, the two-fluid injection device is a sleeve structure.
Preferably, the two-fluid injection device comprises a liquid inlet pipe on the inner layer and an air inlet pipe sleeved on the outer side of the liquid inlet pipe, and a conveying space for compressed air to flow is reserved between the liquid inlet pipe and the air inlet pipe.
Preferably, a mixing area is reserved at the bottom of the air inlet pipe, and the catalyst slurry and the compressed air are injected from the liquid inlet pipe and the air inlet pipe respectively and are mixed in the mixing area and then are sprayed out.
Preferably, the bottom of the two-fluid injection device is provided with an atomizing nozzle, and the catalyst slurry is mixed with compressed air and then is injected from the atomizing nozzle.
Preferably, the atomizing nozzle is a spiral nozzle.
Respectively injecting into the liquid inlet pipe and the air inlet pipeAdding catalyst slurry and compressed air, mixing the catalyst slurry and the compressed air in a mixing area at the bottom of the air inlet pipe, spraying the mixture into the desulfurization and denitrification reaction chamber through an atomizing nozzle to ensure that the catalyst slurry achieves the optimal atomizing effect, spraying the catalyst slurry into the desulfurization and denitrification reaction chamber to be in contact with flue gas and fully mixed, and under the reaction condition of 100 ℃ plus 150 ℃, the catalyst slurry enables SO in the flue gas to be in contact with the flue gas2Absorbing and simultaneously reacting NOxConversion to nitrate or reduction to N2In addition, atomized catalyst slurry is favorable for agglomeration of dust particles in flue gas, the particle size of the dust particles is increased, the settling efficiency of the flue gas in the settling chamber is improved, large particles in the flue gas settle when passing through the settling chamber, the settled flue gas turns back and flows upwards and is discharged from a flue gas outlet at the upper part of the settling chamber, and therefore the comprehensive treatment purpose of desulfurization, denitrification and dust removal is achieved.
As a preferable technical scheme, the desulfurization, denitrification and dust removal device further comprises a liquid collection chamber communicated with the settling chamber, and the bottom of the liquid collection chamber is connected with a liquid drainage pipeline.
Preferably, a drain valve is arranged on the drain pipeline.
As a preferable technical scheme of the invention, the humidifying activation desulfurization and denitrification dust removal system also comprises a catalyst slurry preparation unit and a compressed air supply unit.
The catalyst slurry preparation unit is connected with the liquid inlet of the liquid inlet pipe.
The compressed air supply unit is connected with an air inlet of the air inlet pipe.
As a preferable technical solution of the present invention, the catalyst slurry preparation unit includes a stirring device, a conveying device, and a liquid flow rate detection device, which are connected in sequence.
Preferably, the compressed air supply device comprises an air compressor and an air flow detection device which are connected in sequence.
The catalyst is stirred in a stirring tank and fully mixed with the solvent to prepare catalyst slurry, the catalyst slurry is conveyed to a double-fluid injection device through a conveying device, compressed air is prepared through an air compressor and conveyed to the double-fluid injection device, the flow ratio of the catalyst slurry to the compressed air is respectively controlled through respective flow detection devices and pipeline valves, the catalyst slurry and the compressed air are sprayed out through an atomizing nozzle after being mixed in the double-fluid injection device, the catalyst slurry achieves the best atomizing effect by controlling the atomizing characteristic of the atomizing nozzle, and therefore the reaction rate and the desulfurization and denitrification effects of the catalyst are improved.
In a second aspect, the method for desulfurization and denitrification of flue gas by using the humidification-activated desulfurization, denitrification and dust removal system of the first aspect comprises:
in the desulfurization and denitrification reaction chamber, the mixed liquid of the catalyst slurry and the compressed air sprayed by the two-fluid spraying device contacts with flue gas for desulfurization and denitrification, the flue gas after desulfurization and denitrification enters the settling chamber and then naturally settles, and the flue gas reaching the bottom of the settling chamber turns back upwards to flow and is discharged from the upper part of the settling chamber.
As a preferred technical solution of the present invention, the method comprises:
the method comprises the following steps that (I) a catalyst slurry preparation unit and a compressed air supply unit respectively convey catalyst slurry and compressed air to a two-fluid injection device, and the catalyst slurry and the compressed air are mixed in the two-fluid injection device and then are injected into a desulfurization and denitrification reaction chamber through an atomizing nozzle;
(II) introducing flue gas into the desulfurization and denitrification reaction chamber, and contacting the flue gas with a mixed solution of catalyst slurry and compressed air in the desulfurization and denitrification reaction chamber to complete desulfurization and denitrification;
(III) enabling the flue gas after desulfurization and denitrification to enter a settling chamber for natural settling, and enabling the flue gas reaching the bottom of the settling chamber to return upwards and flow back and be discharged from a flue gas outlet; unreacted catalyst slurry falls into a liquid collecting chamber and is discharged by a liquid discharging pipeline;
preferably, the catalyst slurry in step (i) comprises a catalyst and a solvent.
Preferably, the catalyst comprises one or a combination of at least two of potassium ferrate, potassium permanganate, calcium peroxide, sodium chlorite, or sodium hypochlorite.
Preferably, the solvent is an alkaline solution.
Preferably, the solvent comprises one or a combination of at least two of sodium hydroxide solution, potassium hydroxide solution, sodium carbonate solution or sodium bicarbonate solution.
Preferably, the mass ratio of the catalyst to the solvent is 1: (50 to 200) may be, for example, 1:50, 1:60, 1:70, 1:80, 1:90, 1:100, 1:110, 1:120, 1:130, 1:140, 1:150, 1:160, 1:170, 1:180, 1:190 or 1:200, but is not limited to the enumerated values, and other unrecited values within the numerical range are also applicable.
The volume ratio of the catalyst slurry to the compressed air is 1 (400 to 600), and may be, for example, 1:400, 1:410, 1:420, 1:430, 1:440, 1:450, 1:460, 1:470, 1:480, 1:490, 1:500, 1:510, 1:520, 1:530, 1:540, 1:550, 1:560, 1:570, 1:580, 1:590, or 1:600, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
Preferably, the diameter of the droplets of the mixed liquid of the catalyst slurry and the compressed air sprayed from the atomizing nozzle in the step (I) is 15 to 50 μm, for example, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm or 50 μm, but is not limited to the values listed, and other values not listed in the range of the values are also applicable.
Preferably, the atomizing nozzle of step (I) has a spray pressure of 0.3 to 0.6MPa, and may be, for example, 0.3MPa, 0.32MPa, 0.34MPa, 0.36MPa, 0.38MPa, 0.40MPa, 0.42MPa, 0.44MPa, 0.46MPa, 0.48MPa, 0.50MPa, 0.52MPa, 0.54MPa, 0.56MPa, 0.58MPa or 0.60MPa, but not limited to the values listed, and other values not listed in the range of values are equally suitable.
Preferably, the residence time of the flue gas in the desulfurization and denitrification reaction chamber in the step (II) is 4-6s, for example, 4s, 5s or 6s, but not limited to the values listed, and other values not listed in the range are also applicable.
Preferably, the flow velocity of the flue gas after desulfurization and denitrification in the step (III) in the settling chamber is 0.5-1m/s, such as 0.5m/s, 0.6m/s, 0.7m/s, 0.8m/s, 0.9m/s or 1.0m/s, but not limited to the recited values, and other values in the range are also applicable.
The recitation of numerical ranges herein includes not only the above-recited numerical values, but also any numerical values between non-recited numerical ranges, and is not intended to be exhaustive or to limit the invention to the precise numerical values encompassed within the range for brevity and clarity.
The system refers to an equipment system, or a production equipment.
Compared with the prior art, the invention has the beneficial effects that:
spraying the desulfurization and denitrification catalyst slurry by atomization to remove SO in the flue gas2Absorption of NOxConversion to nitrate or reduction to N2The contact area of the flue gas and the catalyst slurry is increased after the flue gas is contacted with the atomized particles formed by the catalyst slurry, the agglomeration of the smoke particles is facilitated, and the agglomerated smoke particles enable dust particles in the flue gas to freely settle through the settling chamber, so that the functions of desulfurization, denitration and dust removal are achieved at the same time.
Drawings
FIG. 1 is a schematic structural diagram of a desulfurization, denitrification and dust removal device according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a desulfurization, denitrification and dust removal system according to an embodiment of the present invention.
Wherein, 1-air inlet pipe; 2-a smoke uniform distribution plate; 3-an atomizing nozzle; 4-a desulfurization and denitrification reaction chamber; 5-a settling chamber; 6-a liquid collection chamber; 7-a drain valve; 8-a flue gas outlet; 9-flue gas inlet; 10-a compressed air inlet; 11-a liquid inlet pipe; 12-a desulfurization, denitrification and dust removal device; 13-a catalyst slurry preparation unit; 14-compressed air supply unit.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
In a specific embodiment, the desulfurization, denitrification and dust removal system provided by the invention comprises a desulfurization, denitrification and dust removal device 12 as shown in fig. 2, wherein the desulfurization, denitrification and dust removal device 12 comprises a desulfurization, denitrification and dust removal chamber 4 and a settling chamber 5 which are communicated up and down along the flow direction of flue gas as shown in fig. 1, the cylinder part of the desulfurization, denitrification and dust removal chamber 4 extends into the settling chamber 5, and the height of the part of the cylinder part of the desulfurization, denitrification and dust removal chamber 4 extending into the settling chamber 5 accounts for 1/3-1/2 of the overall height of the desulfurization, denitrification and dust removal system 4.
The upper part of the settling chamber 5 is provided with at least one flue gas outlet 8, flue gas is discharged from the bottom of the desulfurization and denitrification reaction chamber 4 and then is introduced into the settling chamber 5, and the flue gas returns upwards after reaching the bottom of the settling chamber 5 and is discharged from the flue gas outlet 8.
The top of the desulfurization and denitrification reaction chamber 4 is provided with a two-fluid injection device, and the two-fluid injection device is used for injecting catalyst slurry and compressed air into the desulfurization and denitrification reaction chamber 4.
The double-fluid injection device is of a sleeve structure, the intake pipe 1 outside the double-fluid injection device is arranged by the liquid inlet pipe 11 and the sleeve in the inner layer, a conveying space for compressed air to flow is reserved between the liquid inlet pipe 11 and the intake pipe 1, a mixing area is reserved at the bottom of the intake pipe 1, a compressed air inlet 10 is formed in the intake pipe 1, and catalyst slurry and compressed air are injected by the liquid inlet pipe 11 and the intake pipe 1 respectively and are sprayed out after being mixed in the mixing area. The bottom of the two-fluid injection device is provided with an atomizing nozzle 3, and the catalyst slurry is mixed with compressed air and then is sprayed out from the atomizing nozzle 3.
The upper part of the desulfurization and denitrification reaction chamber 4 is provided with a flue gas inlet 9, and a flue gas uniform distribution plate 2 is arranged inside the desulfurization and denitrification reaction chamber 4 below the flue gas inlet 9. The flue gas uniform distribution plate 2 is of an annular structure, the annular outer edge of the flue gas uniform distribution plate 2 is tightly attached to the inner wall of the cylinder of the desulfurization and denitrification reaction chamber 4, the annular inner edge of the flue gas uniform distribution plate 2 is tightly attached to the outer wall of the cylinder of the air inlet pipe 1, and flue gas is uniformly dispersed by the flue gas uniform distribution plate 2 and then contacts with mixed liquid of compressed air and catalyst slurry.
The desulfurization denitration dust collector 12 also comprises a liquid collection chamber 6 communicated with the settling chamber 5, the bottom of the liquid collection chamber 6 is connected with a liquid discharge pipeline, and a liquid discharge valve 7 is arranged on the liquid discharge pipeline.
The humidifying, activating, desulfurizing, denitrifying and dedusting system also comprises a catalyst slurry preparation unit 13 and a compressed air supply unit 14, wherein the catalyst slurry preparation unit 13 is connected with a liquid inlet of the liquid inlet pipe 11, and the compressed air supply unit 14 is connected with an air inlet of the air inlet pipe 1. The catalyst slurry preparation unit 13 includes a stirring device, a conveying device, and a liquid flow detection device, which are connected in sequence, and the compressed air supply device includes an air compressor and a gas flow detection device, which are connected in sequence.
In another specific embodiment, the invention provides a method for performing desulfurization and denitrification on flue gas by using the desulfurization, denitrification and dust removal system, which specifically comprises the following steps:
the catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively convey the catalyst slurry and the compressed air to the two-fluid injection device, and the catalyst slurry and the compressed air are mixed in the two-fluid injection device and then are injected into the desulfurization and denitrification reaction chamber 4 through the atomizing nozzle 3;
(II) introducing flue gas into the desulfurization and denitrification reaction chamber 4, and contacting the flue gas with a mixed solution of catalyst slurry and compressed air in the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification;
(III) enabling the flue gas after desulfurization and denitrification to enter a settling chamber 5 for natural settling, and enabling the flue gas reaching the bottom of the settling chamber 5 to return upwards and flow back and be discharged from a flue gas outlet 8; the unreacted catalyst slurry falls into the liquid collecting chamber 6 and is discharged through a drain line.
Example 1
The embodiment provides a flue gas desulfurization and denitration method, wherein a desulfurization, denitration and dust removal system provided by a specific embodiment is adopted to perform desulfurization and denitration treatment on boiler flue gas, and SO in industrial boiler flue gas to be treated2The concentration is 600mg/m3，NOxThe concentration is 300mg/m3The dust concentration is 50mg/m3The processing method specifically comprises the following steps:
the catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively convey the catalyst slurry and the compressed air to the two-fluid injection device, and the catalyst slurry and the compressed air are mixed in the two-fluid injection device and then are injected into the desulfurization and denitrification reaction chamber 4 through the atomizing nozzle 3;
the catalyst slurry comprises a catalyst and a solvent, the adopted catalyst is potassium permanganate, the solvent is a sodium hydroxide solution, and the mass ratio of the catalyst to the solvent is 1:200 respectively. The volume ratio of the catalyst slurry to the compressed air was 1:400, the diameter of the mist droplet of the mixed liquid of the catalyst slurry and the compressed air ejected through the atomizing nozzle 3 was 50 μm, and the atomizing pressure of the atomizing nozzle 3 was 0.3 MPa.
(II) flue gas is introduced into the desulfurization and denitrification reaction chamber 4, the flue gas is contacted with the mixed solution of the catalyst slurry and the compressed air in the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification, and the retention time of the flue gas in the desulfurization and denitrification reaction chamber 4 is 4 s.
(III) enabling the flue gas after desulfurization and denitrification to enter a settling chamber 5 for natural settling, enabling the flow speed of the flue gas after desulfurization and denitrification in the settling chamber 5 to be 1m/s, and enabling the flue gas reaching the bottom of the settling chamber 5 to return upwards and flow back to be discharged from a flue gas outlet 8; the unreacted catalyst slurry falls into the liquid collecting chamber 6 and is discharged through a drain line.
The processed flue gas discharged from the flue gas outlet 8 is sampled and detected to obtain SO in the flue gas2At a concentration of 200mg/m3，NOxAt a concentration of 200mg/m3Dust concentration of 30mg/m3And meets local emission standards.
Example 2
The embodiment provides a flue gas desulfurization and denitration method, wherein a desulfurization, denitration and dust removal system provided by a specific embodiment is adopted to perform desulfurization and denitration treatment on boiler flue gas, and SO in industrial boiler flue gas to be treated2The concentration is 600mg/m3，NOxThe concentration is 300mg/m3The dust concentration is 50mg/m3The processing method specifically comprises the following steps:
the catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively convey the catalyst slurry and the compressed air to the two-fluid injection device, and the catalyst slurry and the compressed air are mixed in the two-fluid injection device and then are injected into the desulfurization and denitrification reaction chamber 4 through the atomizing nozzle 3;
the catalyst slurry comprises a catalyst and a solvent, the adopted catalyst is potassium permanganate, the solvent is a sodium hydroxide solution, and the mass ratio of the catalyst to the solvent is 1:100 respectively. The volume ratio of the catalyst slurry to the compressed air was 1:430, the droplet diameter of the mixed liquid of the catalyst slurry and the compressed air ejected through the atomizing nozzle 3 was 40 μm, and the atomizing pressure of the atomizing nozzle 3 was 0.4 Mpa.
(II) flue gas is introduced into the desulfurization and denitrification reaction chamber 4, the flue gas is contacted with the mixed solution of the catalyst slurry and the compressed air in the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification, and the retention time of the flue gas in the desulfurization and denitrification reaction chamber 4 is 4.5S.
(III) enabling the flue gas after desulfurization and denitrification to enter a settling chamber 5 for natural settling, enabling the flow speed of the flue gas after desulfurization and denitrification in the settling chamber 5 to be 0.8m/s, and enabling the flue gas reaching the bottom of the settling chamber 5 to return upwards and flow back and be discharged from a flue gas outlet 8; the unreacted catalyst slurry falls into the liquid collecting chamber 6 and is discharged through a drain line.
The processed flue gas discharged from the flue gas outlet 8 is sampled and detected to obtain SO in the flue gas2Has a concentration of 100mg/m3，NOxHas a concentration of 150mg/m3The dust concentration is 25mg/m3And meets local emission standards.
Example 3
The embodiment provides a flue gas desulfurization and denitration method, wherein a desulfurization, denitration and dust removal system provided by a specific embodiment is adopted to perform desulfurization and denitration treatment on boiler flue gas, and SO in industrial boiler flue gas to be treated2The concentration is 600mg/m3，NOxThe concentration is 300mg/m3The dust concentration is 50mg/m3The processing method specifically comprises the following steps:
the catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively convey the catalyst slurry and the compressed air to the two-fluid injection device, and the catalyst slurry and the compressed air are mixed in the two-fluid injection device and then are injected into the desulfurization and denitrification reaction chamber 4 through the atomizing nozzle 3;
the catalyst slurry comprises a catalyst and a solvent, the adopted catalyst is potassium permanganate, the solvent is a sodium hydroxide solution, and the mass ratio of the catalyst to the solvent is 1:50 respectively. The volume ratio of the catalyst slurry to the compressed air was 1:450, the diameter of the mist droplet of the mixed liquid of the catalyst slurry and the compressed air ejected through the atomizing nozzle 3 was 30 μm, and the atomizing pressure of the atomizing nozzle 3 was 0.5 Mpa.
(II) flue gas is introduced into the desulfurization and denitrification reaction chamber 4, the flue gas is contacted with the mixed solution of the catalyst slurry and the compressed air in the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification, and the retention time of the flue gas in the desulfurization and denitrification reaction chamber 4 is 5S.
(III) enabling the flue gas after desulfurization and denitrification to enter a settling chamber 5 for natural settling, enabling the flow speed of the flue gas after desulfurization and denitrification in the settling chamber 5 to be 0.6m/s, and enabling the flue gas reaching the bottom of the settling chamber 5 to return upwards and flow back and be discharged from a flue gas outlet 8; the unreacted catalyst slurry falls into the liquid collecting chamber 6 and is discharged through a drain line.
The processed flue gas discharged from the flue gas outlet 8 is sampled and detected to obtain SO in the flue gas2Has a concentration of 50mg/m3，NOxHas a concentration of 100mg/m3The dust concentration is 20mg/m3And meets local emission standards.
Example 4
The embodiment provides a flue gas desulfurization and denitration method, wherein a desulfurization, denitration and dust removal system provided by a specific embodiment is adopted to perform desulfurization and denitration treatment on boiler flue gas, and SO in industrial boiler flue gas to be treated2The concentration is 600mg/m3，NOxThe concentration is 300mg/m3The dust concentration is 50mg/m3The processing method specifically comprises the following steps:
the catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively convey the catalyst slurry and the compressed air to the two-fluid injection device, and the catalyst slurry and the compressed air are mixed in the two-fluid injection device and then are injected into the desulfurization and denitrification reaction chamber 4 through the atomizing nozzle 3;
the catalyst slurry comprises a catalyst and a solvent, the adopted catalyst is potassium ferrate, the solvent is a potassium hydroxide solution, and the mass ratio of the catalyst to the solvent is 1:200 respectively. The volume ratio of the catalyst slurry to the compressed air was 1:500, the droplet diameter of the mixed liquid of the catalyst slurry and the compressed air ejected through the atomizing nozzle 3 was 28 μm, and the atomizing pressure of the atomizing nozzle 3 was 0.55 MPa.
(II) flue gas is introduced into the desulfurization and denitrification reaction chamber 4, the flue gas is contacted with the mixed solution of the catalyst slurry and the compressed air in the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification, and the retention time of the flue gas in the desulfurization and denitrification reaction chamber 4 is 5S.
(III) enabling the flue gas after desulfurization and denitrification to enter a settling chamber 5 for natural settling, enabling the flow speed of the flue gas after desulfurization and denitrification in the settling chamber 5 to be 0.6m/s, and enabling the flue gas reaching the bottom of the settling chamber 5 to return upwards and flow back and be discharged from a flue gas outlet 8; the unreacted catalyst slurry falls into the liquid collecting chamber 6 and is discharged through a drain line.
The processed flue gas discharged from the flue gas outlet 8 is sampled and detected to obtain SO in the flue gas2Has a concentration of 100mg/m3，NOxAt a concentration of 200mg/m3The dust concentration is 20mg/m3And meets local emission standards.
Example 5
The embodiment provides a flue gas desulfurization and denitration method, wherein a desulfurization, denitration and dust removal system provided by a specific embodiment is adopted to perform desulfurization and denitration treatment on boiler flue gas, and SO in industrial boiler flue gas to be treated2The concentration is 800mg/m3，NOxThe concentration is 300mg/m3The dust concentration is 100mg/m3The processing method specifically comprises the following steps:
the catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively convey the catalyst slurry and the compressed air to the two-fluid injection device, and the catalyst slurry and the compressed air are mixed in the two-fluid injection device and then are injected into the desulfurization and denitrification reaction chamber 4 through the atomizing nozzle 3;
the catalyst slurry comprises a catalyst and a solvent, the adopted catalyst is sodium chlorite, the solvent is a sodium carbonate solution, and the mass ratio of the catalyst to the solvent is 1:100 respectively. The volume ratio of the catalyst slurry to the compressed air was 1:530, the droplet diameter of the mixed liquid of the catalyst slurry and the compressed air ejected through the atomizing nozzle 3 was 25 μm, and the atomizing pressure of the atomizing nozzle 3 was 0.56 Mpa.
(II) flue gas is introduced into the desulfurization and denitrification reaction chamber 4, the flue gas is contacted with the mixed solution of the catalyst slurry and the compressed air in the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification, and the retention time of the flue gas in the desulfurization and denitrification reaction chamber 4 is 6S.
(III) enabling the flue gas after desulfurization and denitrification to enter a settling chamber 5 for natural settling, enabling the flow speed of the flue gas after desulfurization and denitrification in the settling chamber 5 to be 0.5m/s, and enabling the flue gas reaching the bottom of the settling chamber 5 to return upwards and flow back and be discharged from a flue gas outlet 8; the unreacted catalyst slurry falls into the liquid collecting chamber 6 and is discharged through a drain line.
The processed flue gas discharged from the flue gas outlet 8 is sampled and detected to obtain SO in the flue gas2Has a concentration of 50mg/m3，NOxHas a concentration of 100mg/m3The dust concentration is 20mg/m3And meets local emission standards.
Example 6
The embodiment provides a flue gas desulfurization and denitration method, wherein a desulfurization, denitration and dust removal system provided by a specific embodiment is adopted to perform desulfurization and denitration treatment on boiler flue gas, and SO in industrial boiler flue gas to be treated2The concentration is 800mg/m3，NOxThe concentration is 300mg/m3The dust concentration is 50mg/m3The processing method specifically comprises the following steps:
the catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively convey the catalyst slurry and the compressed air to the two-fluid injection device, and the catalyst slurry and the compressed air are mixed in the two-fluid injection device and then are injected into the desulfurization and denitrification reaction chamber 4 through the atomizing nozzle 3;
the catalyst slurry comprises a catalyst and a solvent, the adopted catalyst is sodium hypochlorite, the solvent is a sodium hydroxide solution, and the mass ratio of the catalyst to the solvent is 1:100 respectively. The volume ratio of the catalyst slurry to the compressed air was 1:550, the droplet diameter of the mixed liquid of the catalyst slurry and the compressed air ejected through the atomizing nozzle 3 was 22 μm, and the atomizing pressure of the atomizing nozzle 3 was 0.57 Mpa.
(II) flue gas is introduced into the desulfurization and denitrification reaction chamber 4, the flue gas is contacted with the mixed solution of the catalyst slurry and the compressed air in the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification, and the retention time of the flue gas in the desulfurization and denitrification reaction chamber 4 is 6 s.
(III) enabling the flue gas after desulfurization and denitrification to enter a settling chamber 5 for natural settling, enabling the flow speed of the flue gas after desulfurization and denitrification in the settling chamber 5 to be 0.5m/s, and enabling the flue gas reaching the bottom of the settling chamber 5 to return upwards and flow back and be discharged from a flue gas outlet 8; the unreacted catalyst slurry falls into the liquid collecting chamber 6 and is discharged through a drain line.
The processed flue gas discharged from the flue gas outlet 8 is sampled and detected to obtain SO in the flue gas2Has a concentration of 50mg/m3，NOxHas a concentration of 100mg/m3The dust concentration is 20mg/m3And meets local emission standards.
Example 7
The embodiment provides a flue gas desulfurization and denitration method, wherein a desulfurization, denitration and dust removal system provided by a specific embodiment is adopted to perform desulfurization and denitration treatment on boiler flue gas, and SO in industrial boiler flue gas to be treated2The concentration is 800mg/m3，NOxThe concentration is 300mg/m3The dust concentration is 50mg/m3The processing method specifically comprises the following steps:
the catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively convey the catalyst slurry and the compressed air to the two-fluid injection device, and the catalyst slurry and the compressed air are mixed in the two-fluid injection device and then are injected into the desulfurization and denitrification reaction chamber 4 through the atomizing nozzle 3;
the catalyst slurry comprises a catalyst and a solvent, the catalyst is calcium peroxide, the solvent is a sodium carbonate solution, and the mass ratio of the catalyst to the solvent is 1:50 respectively. The volume ratio of the catalyst slurry to the compressed air was 1:570, the diameter of the mist of the mixed liquid of the catalyst slurry and the compressed air ejected through the atomizing nozzle 3 was 18 μm, and the atomizing pressure of the atomizing nozzle 3 was 0.6 Mpa.
(II) flue gas is introduced into the desulfurization and denitrification reaction chamber 4, the flue gas is contacted with the mixed solution of the catalyst slurry and the compressed air in the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification, and the retention time of the flue gas in the desulfurization and denitrification reaction chamber 4 is 6 s.
(III) enabling the flue gas after desulfurization and denitrification to enter a settling chamber 5 for natural settling, enabling the flow speed of the flue gas after desulfurization and denitrification in the settling chamber 5 to be 0.5m/s, and enabling the flue gas reaching the bottom of the settling chamber 5 to return upwards and flow back and be discharged from a flue gas outlet 8; the unreacted catalyst slurry falls into the liquid collecting chamber 6 and is discharged through a drain line.
The processed flue gas discharged from the flue gas outlet 8 is sampled and detected to obtain SO in the flue gas2Has a concentration of 50mg/m3，NOxHas a concentration of 100mg/m3The dust concentration is 20mg/m3And meets local emission standards.
Example 8
The embodiment provides a flue gas desulfurization and denitration method, wherein a desulfurization, denitration and dust removal system provided by a specific embodiment is adopted to perform desulfurization and denitration treatment on boiler flue gas, and SO in industrial boiler flue gas to be treated2The concentration is 500mg/m3，NOxThe concentration is 200mg/m3The dust concentration is 50mg/m3The processing method specifically comprises the following steps:
the catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively convey the catalyst slurry and the compressed air to the two-fluid injection device, and the catalyst slurry and the compressed air are mixed in the two-fluid injection device and then are injected into the desulfurization and denitrification reaction chamber 4 through the atomizing nozzle 3;
the catalyst slurry comprises a catalyst and a solvent, the catalyst is sodium chlorite, the solvent is a sodium bicarbonate solution, and the mass ratio of the catalyst to the solvent is 1:200 respectively. The volume ratio of the catalyst slurry to the compressed air was 1:600, the diameter of the mist droplet of the mixed liquid of the catalyst slurry and the compressed air ejected through the atomizing nozzle 3 was 15 μm, and the atomizing pressure of the atomizing nozzle 3 was 0.6 Mpa.
(II) flue gas is introduced into the desulfurization and denitrification reaction chamber 4, the flue gas is contacted with the mixed solution of the catalyst slurry and the compressed air in the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification, and the retention time of the flue gas in the desulfurization and denitrification reaction chamber 4 is 6 s.
(III) enabling the flue gas after desulfurization and denitrification to enter a settling chamber 5 for natural settling, enabling the flow speed of the flue gas after desulfurization and denitrification in the settling chamber 5 to be 0.5m/s, and enabling the flue gas reaching the bottom of the settling chamber 5 to return upwards and flow back and be discharged from a flue gas outlet 8; the unreacted catalyst slurry falls into the liquid collecting chamber 6 and is discharged through a drain line.
The processed flue gas discharged from the flue gas outlet 8 is sampled and detected to obtain SO in the flue gas2Has a concentration of 50mg/m3，NOxHas a concentration of 100mg/m3The dust concentration is 20mg/m3And meets local emission standards.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.

Claims (10)

1. A humidification-activated desulfurization, denitrification and dust removal system is characterized by comprising a desulfurization, denitrification and dust removal device, wherein the desulfurization, denitrification and dust removal device comprises a desulfurization, denitrification reaction chamber and a settling chamber which are communicated up and down along the flow direction of flue gas, and the barrel part of the desulfurization, denitrification reaction chamber extends into the settling chamber;
the top of the desulfurization and denitrification reaction chamber is provided with a two-fluid injection device, and the two-fluid injection device is used for injecting catalyst slurry and compressed air into the desulfurization and denitrification reaction chamber.
2. The desulfurization, denitrification and dust removal system according to claim 1, wherein the height of the cylinder of the desulfurization and denitrification reaction chamber extending into the settling chamber part is 1/3-1/2 of the total height of the desulfurization and denitrification reaction chamber.
3. The desulfurization, denitrification and dust removal system according to claim 1 or 2, wherein a flue gas inlet is arranged at the upper part of the desulfurization and denitrification reaction chamber;
preferably, a flue gas uniform distribution plate is arranged in the desulfurization and denitrification reaction chamber below the flue gas inlet;
preferably, the flue gas uniform distribution plate is of an annular structure, the annular outer edge of the flue gas uniform distribution plate is tightly attached to the inner wall of the cylinder of the desulfurization and denitrification reaction chamber, and the annular inner edge of the flue gas uniform distribution plate is tightly attached to the outer wall of the cylinder of the gas inlet pipe; the flue gas is uniformly dispersed by the flue gas uniform distribution plate and then is contacted with the mixed liquid of the compressed air and the catalyst slurry.
4. The desulfurization, denitrification and dust removal system according to any one of claims 1 to 3, wherein at least one flue gas outlet is arranged at the upper part of the settling chamber, the flue gas is discharged from the bottom of the desulfurization and denitrification reaction chamber and then introduced into the settling chamber, and the flue gas returns upwards after reaching the bottom of the settling chamber and is discharged from the flue gas outlet.
5. The desulfurization, denitrification and dust removal system according to any one of claims 1-4, wherein the two-fluid injection device is of a sleeve structure;
preferably, the double-fluid injection device comprises a liquid inlet pipe on the inner layer and an air inlet pipe sleeved on the outer side of the liquid inlet pipe, and a conveying space for compressed air to flow is reserved between the liquid inlet pipe and the air inlet pipe;
preferably, a mixing area is reserved at the bottom of the air inlet pipe, and the catalyst slurry and the compressed air are injected from the liquid inlet pipe and the air inlet pipe respectively and are mixed in the mixing area and then are sprayed out;
preferably, an atomizing nozzle is arranged at the bottom of the two-fluid injection device, and the catalyst slurry is mixed with compressed air and then is injected out of the atomizing nozzle;
preferably, the atomizing nozzle is a spiral nozzle.
6. The desulfurization, denitrification and dust removal system according to any one of claims 1-5, wherein the desulfurization, denitrification and dust removal device further comprises a liquid collection chamber communicated with the settling chamber, and the bottom of the liquid collection chamber is connected with a liquid drainage pipeline;
preferably, a drain valve is arranged on the drain pipeline.
7. The desulfurization, denitrification and dust removal system according to any one of claims 1 to 6, wherein the humidification activation desulfurization, denitrification and dust removal system further comprises a catalyst slurry preparation unit and a compressed air supply unit;
the catalyst slurry preparation unit is connected with the liquid inlet of the liquid inlet pipe;
the compressed air supply unit is connected with an air inlet of the air inlet pipe.
8. The desulfurization, denitrification and dust removal system according to any one of claims 1 to 7, wherein the catalyst slurry preparation unit comprises a stirring device, a conveying device and a liquid flow detection device which are connected in sequence;
preferably, the compressed air supply device comprises an air compressor and an air flow detection device which are connected in sequence.
9. A method for desulfurization and denitrification of flue gas by using the humidification-activated desulfurization, denitrification and dust removal system of any one of claims 1 to 8, wherein the method comprises the following steps:
in the desulfurization and denitrification reaction chamber, the mixed liquid of the catalyst slurry and the compressed air sprayed by the two-fluid spraying device contacts with flue gas for desulfurization and denitrification, the flue gas after desulfurization and denitrification enters the settling chamber and then naturally settles, and the flue gas reaching the bottom of the settling chamber turns back upwards to flow and is discharged from the upper part of the settling chamber.
10. The method of claim 9, wherein the method comprises:
the method comprises the following steps that (I) a catalyst slurry preparation unit and a compressed air supply unit respectively convey catalyst slurry and compressed air to a two-fluid injection device, and the catalyst slurry and the compressed air are mixed in the two-fluid injection device and then are injected into a desulfurization and denitrification reaction chamber through an atomizing nozzle;
(II) introducing flue gas into the desulfurization and denitrification reaction chamber, and contacting the flue gas with a mixed solution of catalyst slurry and compressed air in the desulfurization and denitrification reaction chamber to complete desulfurization and denitrification;
(III) enabling the flue gas after desulfurization and denitrification to enter a settling chamber for natural settling, and enabling the flue gas reaching the bottom of the settling chamber to return upwards and flow back and be discharged from a flue gas outlet; unreacted catalyst slurry falls into a liquid collecting chamber and is discharged by a liquid discharging pipeline;
preferably, the catalyst slurry in step (i) comprises a catalyst and a solvent;
preferably, the catalyst comprises one or a combination of at least two of potassium ferrate, potassium permanganate, calcium peroxide, sodium chlorite or sodium hypochlorite;
preferably, the solvent is an alkaline solution;
preferably, the solvent comprises one or a combination of at least two of sodium hydroxide solution, potassium hydroxide solution, sodium carbonate solution or sodium bicarbonate solution;
preferably, the mass ratio of the catalyst to the solvent is 1: (50-200);
preferably, the volume ratio of the catalyst slurry to the compressed air is 1 (400-600);
preferably, the diameter of the fog drop of the mixed liquid of the catalyst slurry and the compressed air sprayed by the atomizing nozzle in the step (I) is 15-50 μm;
preferably, the atomizing pressure of the atomizing nozzle in the step (I) is 0.3-0.6 MPa;
preferably, the retention time of the flue gas in the desulfurization and denitrification reaction chamber in the step (II) is 4-6 s;
preferably, the flow velocity of the flue gas subjected to desulfurization and denitrification in the step (III) in the settling chamber is 0.5-1 m/s.
CN201911051023.4A 2019-10-31 2019-10-31 Humidification-activated desulfurization, denitrification and dust removal system and treatment method using same Pending CN110605021A (en)

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