CN110605021A - A desulfurization, denitrification and dust removal system activated by humidification and a treatment method using the same - Google Patents

Abstract

The invention provides a desulfurization, denitrification and dust removal system activated by humidification and a treatment method using the same. The desulfurization, denitration and dust removal system includes a desulfurization, denitration and dust removal device, and the desulfurization, denitration and dust removal device includes desulfurization, denitration and dust removal devices connected up and down along the flue gas flow direction. The denitrification reaction chamber and the settling chamber, the cylinder 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 dual-fluid injection device, and the dual-fluid injection device is used for desulfurization and denitrification. The chamber is sprayed with catalyst slurry and compressed air. By atomizing and spraying the desulfurization and denitrification catalyst slurry, the SO ₂ in the flue gas is absorbed, and the NO _x is converted into nitrate or reduced to N ₂ . The contact area is also conducive to the agglomeration of soot particles. The agglomerated soot particles pass through the settling chamber to make the dust particles in the flue gas settle freely, so as to achieve the functions of simultaneous desulfurization, denitrification and dust removal.

Description

A desulfurization, denitrification and dust removal system activated by humidification and a treatment method using the 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-activated desulfurization, denitration and dust removal system and a treatment method using the same.

Background technique

At present, in the application of boiler flue gas treatment, most of the desulfurization, denitrification and dust removal are separate application systems. SNCR, SCR, COA, low-temperature catalyst denitrification and other technologies. The commonly used dust removal technologies are bag dust removal, electric dust removal, and electric bag composite dust removal. The current humidification and activation towers mostly use water spraying to agglomerate the particles for dust reduction, and the flue gas It is a high-inlet and low-outlet structure, and only treats smoke and dust. The above technologies can only remove one of SO ₂ , NO _x , and dust, and have different shortcomings such as large floor area, large investment, and high operation and maintenance costs. .

CN104785078A discloses a purifying device for humidifying and activating circulating ash after spraying calcium in the furnace, including a calcium spraying system in the furnace, a humidifying and activating system behind the furnace and a circulating ash system; the calcium spraying system in the furnace includes a lime powder storage Silo, lime powder metering bin, rotary feeder, jet pump, limestone conveying and distribution fan and heating fan; the post-furnace humidification and activation system includes humidification and activation tower, atomizing spray gun, process water control system and water supply tank; The circulating ash system includes a desulfurization tower, a bag filter, a return ash chute and a new lime powder feeding pipe; the new lime powder feeding pipe outlet is connected to the fresh lime powder in the desulfurization tower through a feed pipe. Add to the mouth.

CN206881509U discloses a kind of desulfurization, denitrification and dust removal integrated equipment, comprising a rectangular box, the left side of the rectangular box is provided with an air inlet pipe, the right side is provided with an air outlet pipe, and the rectangular box is provided with vertical partitions 1 and 2 , partition one and partition two divide the inner cavity of the rectangular box into a dust removal chamber, a denitrification chamber and a desulfurization chamber. A filter frame is arranged in the dust removal chamber, and a vertical filter screen is arranged on the filter frame. Electric heating wires are pre-embedded in the first partition and the second partition, and a heat insulation layer is connected to the side of the first partition and the second partition away from the denitration chamber. The upper side of the partition one is provided with an air duct connecting the dust removal chamber and the denitration chamber 1. On the upper side of the partition 2, there is an air duct 2 connecting the denitrification chamber and the desulfurization chamber. The desulfurization chamber is divided into a washing chamber on the left and a desulfurization sub-chamber on the right by a vertical partition. An ammonia water atomizing nozzle and ammonia gas recovery are arranged on the rectangular box. The washing chamber is provided with a washing liquid. An ammonia water nozzle is arranged on the rectangular box on the top of the sub-cavity.

CN204478093U discloses a multi-bend gas purification system, comprising a multi-bend, a dusty gas inlet and a dedusting gas outlet; the upper and lower walls or the left and right walls of the multi-bend are provided with partition walls, and the two partition walls Arranged alternately; multi-bends are provided with burners, and the lower part of the multi-bends is provided with a slag pool, the slag pool is a cone-shaped structure, and the slag pool is connected to the slag outlet; The system is connected, and the dedusting gas outlet is connected to the waste heat power generation system; the multi-bend is provided with a viscous low-melting material nozzle, and the viscous low-melting material nozzle is located on the upper part or side wall of the multi-bend.

To sum up, there is no integrated purification treatment system for desulfurization, denitrification and dust removal for boiler flue gas at present. Therefore, it is urgent to design a treatment system for simultaneous desulfurization, denitrification and dust removal for boiler flue gas.

Contents of the invention

Aiming at the deficiencies in the prior art, the object of the present invention is to provide a desulfurization, denitrification and dust removal system with humidification and activation and a treatment method using it. By spraying the desulfurization and denitration catalyst slurry into the desulfurization and denitration catalyst slurry, the SO in the _flue gas is absorbed, NO _x is converted into nitrate or reduced to N ₂ , and the contact area between the flue gas and the catalyst slurry is increased after the contact of the atomized particles formed by the flue gas and the catalyst slurry is also conducive to the agglomeration of the soot particles. The agglomerated soot particles pass through the settling chamber to make The dust particles in the flue gas settle freely, so as to achieve the functions of simultaneous desulfurization, denitrification and dust removal.

For reaching this purpose, the present invention adopts following technical scheme:

In the first aspect, the present invention provides a desulfurization, denitration and dust removal system activated by humidification. The desulfurization, denitration and dust removal system includes a desulfurization, denitration and dust removal device, and the desulfurization, denitration and dust removal device includes a desulfurization and denitration reaction connected up and down along the flue gas flow direction. chamber and a settling chamber, the cylinder 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 dual-fluid injection device, and the dual-fluid injection device is used to inject catalyst slurry and compressed air into the desulfurization and denitrification reaction chamber.

By atomizing and spraying the desulfurization and denitrification catalyst slurry, the SO ₂ in the flue gas is absorbed, and the NO _x is converted into nitrate or reduced to N ₂ . The contact area is also conducive to the agglomeration of soot particles. The agglomerated soot particles pass through the settling chamber to make the dust particles in the flue gas settle freely, so as to achieve the functions of simultaneous desulfurization, denitrification and dust removal.

As a preferred technical solution of the present invention, the height of the cylinder of the desulfurization and denitration reaction chamber extending into the settling chamber accounts for 1/3 to 1/2 of the overall height of the desulfurization and denitration reaction chamber.

As a preferred technical solution of the present invention, the upper part of the desulfurization and denitrification reaction chamber is provided with a flue gas inlet.

Preferably, a flue gas distribution plate is arranged inside the desulfurization and denitrification reaction chamber below the flue gas inlet.

Preferably, the flue gas uniform distribution plate has an annular structure, the annular outer edge of the flue gas uniform distribution plate is close 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 close to the cylinder of the intake pipe The outer wall; the flue gas is evenly dispersed by the flue gas uniform distribution plate, and then contacts with the mixture of compressed air and catalyst slurry.

As a preferred technical solution of the present invention, the upper part of the settling chamber is provided with at least one flue gas outlet, and the flue gas is discharged into the settling chamber after being discharged from the bottom of the desulfurization and denitrification reaction chamber. The gas outlet is discharged.

As a preferred technical solution of the present invention, the dual-fluid injection device is a casing structure.

Preferably, the dual-fluid injection device includes an inner liquid inlet pipe and an air inlet pipe sheathed on its outer side, and there is a delivery space for compressed air to flow between the liquid inlet pipe and the air inlet pipe.

Preferably, a mixing area is left at the bottom of the inlet pipe, and the catalyst slurry and compressed air are respectively injected through the liquid inlet pipe and the air inlet pipe and mixed in the mixing area before being sprayed out.

Preferably, an atomizing nozzle is provided at the bottom of the dual-fluid injection device, and the catalyst slurry is mixed with compressed air and sprayed out from the atomizing nozzle.

Preferably, the atomizing nozzle is a spiral nozzle.

The catalyst slurry and compressed air are injected into the liquid inlet pipe and the inlet pipe respectively. The catalyst slurry and compressed air are mixed in the mixing area at the bottom of the inlet pipe and then sprayed into the desulfurization and denitrification reaction chamber through the atomizing nozzle, so that the catalyst slurry can achieve the best atomization effect. , sprayed into the desulfurization and denitrification reaction chamber and fully mixed with the flue gas. Under the reaction conditions of 100-150 ° C, the catalyst slurry absorbs SO ₂ in the flue gas, and simultaneously converts NO _x into nitrate or reduces it to N ₂ . In addition, the atomized catalyst slurry is conducive to the agglomeration of dust particles in the flue gas, increases the particle size of the dust particles, and improves the settling efficiency of the flue gas in the settling chamber. When passing through the settling chamber, the large particles in the flue gas will settle and settle The final flue gas turns back and flows upward, and is discharged from the flue gas outlet on the upper part of the settling chamber, so as to achieve the comprehensive treatment of desulfurization, denitrification and dust removal.

As a preferred technical solution of the present invention, the desulfurization, denitrification and dust removal device further includes a liquid collection chamber communicated with the settling chamber, and a drain pipeline is connected to the bottom of the liquid collection chamber.

Preferably, a drain valve is arranged on the drain pipeline.

As a preferred technical solution of the present invention, the humidified activated desulfurization, denitrification and dust removal system further includes a catalyst slurry preparation unit and a compressed air supply unit.

The catalyst slurry preparation unit is connected to the liquid inlet of the liquid inlet pipe.

The compressed air supply unit is connected to the air inlet of the air intake pipe.

As a preferred technical solution of the present invention, the catalyst slurry preparation unit includes a stirring device, a conveying device and a liquid flow detection device connected in sequence.

Preferably, the compressed air supply device includes an air compressor and a gas flow detection device connected in sequence.

The catalyst is stirred in the mixing tank and fully mixed with the solvent to form a catalyst slurry. The catalyst slurry is transported to the dual-fluid injection device through the conveying device, and the compressed air is prepared by the air compressor and sent to the dual-fluid injection device. The flow rate of the catalyst slurry and compressed air is adjusted. The ratio is controlled by their respective flow detection devices and pipeline valves. The catalyst slurry and compressed air are sprayed out from the atomizing nozzle after being mixed by the two-fluid injection device. By controlling the atomization characteristics of the atomizing nozzle, the catalyst slurry can achieve the best mist. The chemical effect, thereby improving the reaction rate of the catalyst and the effect of desulfurization and denitrification.

In the second aspect, the desulfurization and denitrification method of flue gas is carried out by using the desulfurization, denitrification and dust removal system described in the first aspect, and the method includes:

In the desulfurization and denitrification reaction chamber, the mixture of catalyst slurry and compressed air sprayed by the dual-fluid injection device is in contact with the flue gas for desulfurization and denitrification. The flue gas after desulfurization and denitrification enters the settling chamber and settles naturally, and the flue gas after reaching the bottom of the settling chamber Turn up flow and discharge from the upper part of the settling chamber.

As a kind of preferred technical scheme of the present invention, described method comprises:

(I) The catalyst slurry preparation unit and the compressed air supply unit deliver the catalyst slurry and compressed air to the dual-fluid injection device respectively, and the catalyst slurry and compressed air are mixed in the dual-fluid injection device and sprayed into the desulfurization and denitrification reaction chamber by the atomizing nozzle;

(II) Feed flue gas into the desulfurization and denitrification reaction chamber, and the mixture of flue gas, catalyst slurry and compressed air is contacted in the desulfurization and denitration reaction chamber to complete desulfurization and denitrification;

(Ⅲ) The flue gas after desulfurization and denitrification enters the settling chamber to settle naturally, and the flue gas that reaches the bottom of the settling chamber flows upwards and is discharged from the flue gas outlet; the unreacted catalyst slurry falls into the liquid collection chamber and is discharged from the liquid discharge pipeline;

Preferably, the catalyst slurry in step (I) includes catalyst and solvent.

Preferably, the catalyst includes 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 includes 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), such as 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 not limited to the listed values, the value range Other unlisted values also apply.

The volume ratio of catalyst slurry to compressed air is 1:(400～600), for example, it can be 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 not limited to the listed values, other unlisted values within this range are also applicable.

Preferably, the droplet diameter of the mixture of catalyst slurry and compressed air sprayed out through the atomizing nozzle in step (I) is 15-50 μm, such as 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm or 50 μm , but not limited to the listed values, other unlisted values within this range are also applicable.

Preferably, the spray pressure of the atomizing nozzle described in step (I) is 0.3-0.6MPa, such as 0.3MPa, 0.32MPa, 0.34MPa, 0.36MPa, 0.38MPa, 0.40MPa, 0.42MPa, 0.44MPa, 0.46MPa MPa, 0.48MPa, 0.50MPa, 0.52MPa, 0.54MPa, 0.56MPa, 0.58MPa or 0.60MPa, but not limited to the listed values, other unlisted values within this range are also applicable.

Preferably, the residence time of the flue gas in the desulfurization and denitrification reaction chamber in step (II) is 4-6s, for example, it can be 4s, 5s or 6s, but it is not limited to the listed values, other unlisted values within this range The same applies.

Preferably, the flow velocity of the flue gas in the settling chamber after desulfurization and denitrification in step (III) 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 listed values, other unlisted values within this range are also applicable.

The numerical ranges described in the present invention not only include the above-mentioned point values, but also include any point values between the above-mentioned numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention will not exhaustively list the above-mentioned point values. Specific point values covered by the stated ranges.

The system refers to an equipment system, a device system or a production device.

Compared with prior art, the beneficial effect of the present invention is:

By atomizing and spraying the desulfurization and denitrification catalyst slurry, the SO ₂ in the flue gas is absorbed, and the NO _x is converted into nitrate or reduced to N ₂ . The contact area is also conducive to the agglomeration of soot particles. The agglomerated soot particles pass through the settling chamber to make the dust particles in the flue gas settle freely, so as to achieve the functions of simultaneous desulfurization, denitrification and dust removal.

Description of drawings

Fig. 1 is a schematic structural view of a desulfurization, denitrification and dust removal device provided by a specific embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a desulfurization, denitrification and dust removal system provided by a specific embodiment of the present invention.

Among them, 1-intake pipe; 2-flue gas uniform distribution plate; 3-atomizing nozzle; 4-desulfurization and denitrification reaction chamber; 5-sedimentation chamber; ; 9-flue gas inlet; 10-compressed air inlet; 11-liquid inlet pipe; 12-desulfurization, denitrification and dust removal device; 13-catalyst slurry preparation unit; 14-compressed air supply unit.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

In a specific embodiment, the present invention provides a desulfurization, denitrification and dust removal system with humidification and activation. The desulfurization, denitration and dust removal system is shown in FIG. As shown, along the flue gas flow direction, it includes the desulfurization and denitrification reaction chamber 4 and the settling chamber 5 connected up and down. The cylinder part of the desulfurization and denitrification reaction chamber 4 extends into the settlement chamber 5, and the cylinder body of the desulfurization and denitration reaction chamber 4 extends into the settling chamber 5 part. The height accounts for 1/3-1/2 of the overall height of the desulfurization and denitrification reaction chamber 4.

The upper part of the settling chamber 5 is provided with at least one flue gas outlet 8. The flue gas is discharged from the bottom of the desulfurization and denitrification reaction chamber 4 and then enters the settling chamber 5.

The top of the desulfurization and denitrification reaction chamber 4 is provided with a dual-fluid injection device, which is used to inject catalyst slurry and compressed air into the desulfurization and denitrification reaction chamber 4 .

The dual-fluid injection device is a casing structure, including the inner liquid inlet pipe 11 and the air inlet pipe 1 sleeved on its outer side. There is a delivery space for compressed air to flow between the liquid inlet pipe 11 and the air inlet pipe 1. The air inlet pipe 1. There is a mixing area at the bottom, and a compressed air inlet 10 is opened on the air inlet pipe 1. The catalyst slurry and compressed air are respectively injected from the liquid inlet pipe 11 and the air inlet pipe 1 and mixed in the mixing area before being sprayed out. An atomizing nozzle 3 is arranged at the bottom of the dual-fluid injection device, and the catalyst slurry is sprayed out from the atomizing nozzle 3 after being mixed with compressed air.

A flue gas inlet 9 is arranged on the upper part of the desulfurization and denitrification reaction chamber 4 , 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 has a ring structure, the annular outer edge of the flue gas uniform distribution plate 2 is close to the inner wall of the cylinder of the desulfurization and denitrification reaction chamber 4, and the annular inner edge of the flue gas uniform distribution plate 2 is close to the cylinder body of the intake pipe 1 On the outer wall, the flue gas is evenly dispersed by the flue gas uniform distribution plate 2 and then contacts with the mixed liquid of compressed air and catalyst slurry.

The desulfurization, denitrification and dust removal device 12 also includes a liquid collection chamber 6 connected to the settling chamber 5 , a drain pipeline is connected to the bottom of the liquid collection chamber 6 , and a drain valve 7 is arranged on the drain pipeline.

The humidification activated desulfurization, denitrification and dust removal system also includes a catalyst slurry preparation unit 13 and a compressed air supply unit 14. The catalyst slurry preparation unit 13 is connected to the liquid inlet of the liquid inlet pipe 11, and the compressed air supply unit 14 is connected to the air inlet of the inlet pipe 1. Wherein, the catalyst slurry preparation unit 13 includes a stirring device, a conveying device and a liquid flow detection device connected in sequence, and the compressed air supply device includes an air compressor and a gas flow detection device connected in sequence.

In another specific embodiment, the present invention provides a method for desulfurization and denitrification of flue gas using the above-mentioned desulfurization, denitrification and dust removal system, and the method specifically includes the following steps:

(I) The catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively deliver the catalyst slurry and compressed air to the dual-fluid injection device, and after being mixed in the dual-fluid injection device, the catalyst slurry and compressed air are sprayed into the desulfurization and denitrification reaction by the atomizing nozzle 3 Room 4;

(II) Feed the flue gas into the desulfurization and denitrification reaction chamber 4, and complete the desulfurization and denitrification after the mixture of flue gas, catalyst slurry and compressed air contacts the desulfurization and denitrification reaction chamber 4;

(Ⅲ) After desulfurization and denitrification, the flue gas enters the settling chamber 5 and settles naturally, and the flue gas that reaches the bottom of the settling chamber 5 turns back and flows upwards and is discharged from the flue gas outlet 8; the unreacted catalyst slurry falls into the liquid collection chamber 6 and is discharged The line is drained.

Example 1

This embodiment provides a method for flue gas desulfurization and denitrification. The desulfurization, denitrification and dust removal system provided in the specific embodiment is used to perform desulfurization and denitrification treatment on boiler flue gas. _The SO2 concentration in the industrial boiler flue gas to be treated is 600 mg/ ^m3 . The _NOx concentration is 300mg/m ³ , the dust concentration is 50mg/m ³ , and the treatment method specifically includes the following steps:

(I) The catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively deliver the catalyst slurry and compressed air to the dual-fluid injection device, and after being mixed in the dual-fluid injection device, the catalyst slurry and compressed air are sprayed into the desulfurization and denitrification reaction by the atomizing nozzle 3 Room 4;

Wherein, the catalyst slurry includes a catalyst and a solvent, the catalyst used is potassium permanganate, the solvent is a sodium hydroxide solution, and the mass ratio of the catalyst and the solvent is 1:200 respectively. The volume ratio of catalyst slurry to compressed air is 1:400, the droplet diameter of the mixture of catalyst slurry and compressed air sprayed out by atomizing nozzle 3 is 50 μm, and the spray pressure of atomizing nozzle 3 is 0.3 MPa.

(II) Feed flue gas into the desulfurization and denitrification reaction chamber 4, and the mixed solution of flue gas, catalyst slurry and compressed air is contacted in the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification, and the residence time of the flue gas in the desulfurization and denitrification reaction chamber 4 is 4s.

(Ⅲ) The flue gas after desulfurization and denitrification enters the settling chamber 5 and settles naturally. The flow velocity of the flue gas after desulfurization and denitrification in the settling chamber 5 is 1m/s, and the flue gas reaching the bottom of the settling chamber 5 turns back upwards and flows from the flue gas The outlet 8 is discharged; the unreacted catalyst slurry falls into the liquid collection chamber 6 and is discharged through the liquid discharge pipeline.

Sampling and testing the treated flue gas discharged from the flue gas outlet 8, the measured concentration of SO ₂ in the flue gas is 200 mg/m ³ , the concentration of NO _x is 200 mg/m ³ , and the concentration of dust is 30 mg/m ³ , which meets the local emission standards.

Example 2

This embodiment provides a method for flue gas desulfurization and denitrification. The desulfurization, denitrification and dust removal system provided in the specific embodiment is used to perform desulfurization and denitrification treatment on boiler flue gas. _The SO2 concentration in the industrial boiler flue gas to be treated is 600 mg/ ^m3 . The _NOx concentration is 300mg/m ³ , the dust concentration is 50mg/m ³ , and the treatment method specifically includes the following steps:

(I) The catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively deliver the catalyst slurry and compressed air to the dual-fluid injection device, and after being mixed in the dual-fluid injection device, the catalyst slurry and compressed air are sprayed into the desulfurization and denitrification reaction by the atomizing nozzle 3 Room 4;

Wherein, the catalyst slurry includes a catalyst and a solvent, the catalyst used is potassium permanganate, the solvent is a sodium hydroxide solution, and the mass ratio of the catalyst and the solvent is 1:100 respectively. The volume ratio of catalyst slurry to compressed air is 1:430, the droplet diameter of the mixture of catalyst slurry and compressed air sprayed out by atomizing nozzle 3 is 40 μm, and the spray pressure of atomizing nozzle 3 is 0.4Mpa.

(II) Feed flue gas into the desulfurization and denitrification reaction chamber 4, and the mixed solution of flue gas, catalyst slurry and compressed air is contacted in the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification, and the residence time of the flue gas in the desulfurization and denitrification reaction chamber 4 is 4.5S.

(Ⅲ) The flue gas after desulfurization and denitrification enters the settling chamber 5 and settles naturally. The flow velocity of the flue gas after desulfurization and denitrification in the settling chamber 5 is 0.8m/s, and the flue gas that reaches the bottom of the settling chamber 5 turns upwards and flows from the flue gas to the bottom of the settling chamber 5. The gas outlet 8 is discharged; the unreacted catalyst slurry falls into the liquid collection chamber 6 and is discharged through the liquid discharge pipeline.

Sampling and testing the treated flue gas discharged from the flue gas outlet 8 shows that the concentration of SO ₂ in the flue gas is 100 mg/m ³ , the concentration of NO _x is 150 mg/m ³ , and the concentration of dust is 25 mg/m ³ , meeting the requirements of local emission standards.

Example 3

This embodiment provides a method for flue gas desulfurization and denitrification. The desulfurization, denitrification and dust removal system provided in the specific embodiment is used to perform desulfurization and denitrification treatment on boiler flue gas. _The SO2 concentration in the industrial boiler flue gas to be treated is 600 mg/ ^m3 . The _NOx concentration is 300mg/m ³ , the dust concentration is 50mg/m ³ , and the treatment method specifically includes the following steps:

(I) The catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively deliver the catalyst slurry and compressed air to the dual-fluid injection device, and after being mixed in the dual-fluid injection device, the catalyst slurry and compressed air are sprayed into the desulfurization and denitrification reaction by the atomizing nozzle 3 Room 4;

Wherein, the catalyst slurry includes a catalyst and a solvent, the catalyst used is potassium permanganate, the solvent is a sodium hydroxide solution, and the mass ratio of the catalyst and the solvent is 1:50 respectively. The volume ratio of the catalyst slurry to the compressed air is 1:450, the droplet diameter of the mixture of the catalyst slurry and the compressed air sprayed out by the atomizing nozzle 3 is 30 μm, and the spray pressure of the atomizing nozzle 3 is 0.5Mpa.

(II) Feed flue gas into the desulfurization and denitrification reaction chamber 4, and the mixed solution of flue gas, catalyst slurry and compressed air is contacted in the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification, and the residence time of the flue gas in the desulfurization and denitrification reaction chamber 4 is 5S.

(Ⅲ) The flue gas after desulfurization and denitrification enters the settling chamber 5 and settles naturally. The flow velocity of the flue gas after desulfurization and denitrification in the settling chamber 5 is 0.6m/s, and the flue gas that reaches the bottom of the settling chamber 5 turns upward and flows from the flue gas to the bottom of the settling chamber 5. The gas outlet 8 is discharged; the unreacted catalyst slurry falls into the liquid collection chamber 6 and is discharged through the liquid discharge pipeline.

Sampling and testing the treated flue gas discharged from the flue gas outlet 8 shows that the concentration of SO ₂ in the flue gas is 50 mg/m ³ , the concentration of NO _x is 100 mg/m ³ , and the concentration of dust is 20 mg/m ³ , meeting the local emission standards.

Example 4

This embodiment provides a method for flue gas desulfurization and denitrification. The desulfurization, denitrification and dust removal system provided in the specific embodiment is used to perform desulfurization and denitrification treatment on boiler flue gas. _The SO2 concentration in the industrial boiler flue gas to be treated is 600 mg/ ^m3 . The _NOx concentration is 300mg/m ³ , the dust concentration is 50mg/m ³ , and the treatment method specifically includes the following steps:

(I) The catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively deliver the catalyst slurry and compressed air to the dual-fluid injection device, and after being mixed in the dual-fluid injection device, the catalyst slurry and compressed air are sprayed into the desulfurization and denitrification reaction by the atomizing nozzle 3 Room 4;

Wherein, the catalyst slurry includes a catalyst and a solvent, the catalyst used is potassium ferrate, the solvent is potassium hydroxide solution, and the mass ratio of the catalyst and the solvent is 1:200 respectively. The volume ratio of catalyst slurry to compressed air is 1:500, the droplet diameter of the mixture of catalyst slurry and compressed air sprayed out by atomizing nozzle 3 is 28 μm, and the spray pressure of atomizing nozzle 3 is 0.55 MPa.

(II) Feed flue gas into the desulfurization and denitrification reaction chamber 4, and the mixed solution of flue gas, catalyst slurry and compressed air is contacted in the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification, and the residence time of the flue gas in the desulfurization and denitrification reaction chamber 4 is 5S.

(Ⅲ) The flue gas after desulfurization and denitrification enters the settling chamber 5 and settles naturally. The flow velocity of the flue gas after desulfurization and denitrification in the settling chamber 5 is 0.6m/s, and the flue gas that reaches the bottom of the settling chamber 5 turns upward and flows from the flue gas to the bottom of the settling chamber 5. The gas outlet 8 is discharged; the unreacted catalyst slurry falls into the liquid collection chamber 6 and is discharged through the liquid discharge pipeline.

Sampling and testing the treated flue gas discharged from the flue gas outlet 8 shows that the concentration of SO ₂ in the flue gas is 100 mg/m ³ , the concentration of NO _x is 200 mg/m ³ , and the concentration of dust is 20 mg/m ³ , meeting the local emission standards.

Example 5

This embodiment provides a method for flue gas desulfurization and denitrification. The desulfurization, denitrification and dust removal system provided in the specific embodiment is used to perform desulfurization and denitration treatment on boiler flue gas. The concentration of SO ₂ in the industrial boiler flue gas to be treated is 800 mg/m ³ . The _NOx concentration is 300mg/m ³ , the dust concentration is 100mg/m ³ , and the treatment method specifically includes the following steps:

(I) The catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively deliver the catalyst slurry and compressed air to the dual-fluid injection device, and after being mixed in the dual-fluid injection device, the catalyst slurry and compressed air are sprayed into the desulfurization and denitrification reaction by the atomizing nozzle 3 Room 4;

Wherein, the catalyst slurry includes a catalyst and a solvent, the catalyst used is sodium chlorite, the solvent is a sodium carbonate solution, and the mass ratio of the catalyst and the solvent is 1:100 respectively. The volume ratio of catalyst slurry to compressed air is 1:530, the droplet diameter of the mixture of catalyst slurry and compressed air sprayed out by atomizing nozzle 3 is 25 μm, and the spray pressure of atomizing nozzle 3 is 0.56Mpa.

(II) Feed flue gas into the desulfurization and denitrification reaction chamber 4, and the mixed solution of flue gas, catalyst slurry and compressed air is contacted in the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification, and the residence time of the flue gas in the desulfurization and denitrification reaction chamber 4 is 6S.

(Ⅲ) The flue gas after desulfurization and denitrification enters the settling chamber 5 and settles naturally. The flow velocity of the flue gas after desulfurization and denitrification in the settling chamber 5 is 0.5m/s, and the flue gas that reaches the bottom of the settling chamber 5 turns upwards and flows from the flue gas to the bottom of the settling chamber 5. The gas outlet 8 is discharged; the unreacted catalyst slurry falls into the liquid collection chamber 6 and is discharged through the liquid discharge pipeline.

Sampling and testing the treated flue gas discharged from the flue gas outlet 8 shows that the concentration of SO ₂ in the flue gas is 50 mg/m ³ , the concentration of NO _x is 100 mg/m ³ , and the concentration of dust is 20 mg/m ³ , meeting the local emission standards.

Example 6

This embodiment provides a method for flue gas desulfurization and denitrification. The desulfurization, denitrification and dust removal system provided in the specific embodiment is used to perform desulfurization and denitration treatment on boiler flue gas. The concentration of SO ₂ in the industrial boiler flue gas to be treated is 800 mg/m ³ . The _NOx concentration is 300mg/m ³ , the dust concentration is 50mg/m ³ , and the treatment method specifically includes the following steps:

(I) The catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively deliver the catalyst slurry and compressed air to the dual-fluid injection device, and after being mixed in the dual-fluid injection device, the catalyst slurry and compressed air are sprayed into the desulfurization and denitrification reaction by the atomizing nozzle 3 Room 4;

Wherein, the catalyst slurry includes a catalyst and a solvent, the catalyst used is sodium hypochlorite, the solvent is a sodium hydroxide solution, and the mass ratio of the catalyst and the solvent is 1:100 respectively. The volume ratio of the catalyst slurry to the compressed air is 1:550, the droplet diameter of the mixture of the catalyst slurry and the compressed air sprayed out by the atomizing nozzle 3 is 22 μm, and the spray pressure of the atomizing nozzle 3 is 0.57Mpa.

(II) Feed flue gas into the desulfurization and denitrification reaction chamber 4, and the mixed solution of flue gas, catalyst slurry and compressed air is contacted in the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification, and the residence time of the flue gas in the desulfurization and denitrification reaction chamber 4 is 6s.

(Ⅲ) The flue gas after desulfurization and denitrification enters the settling chamber 5 and settles naturally. The flow velocity of the flue gas after desulfurization and denitrification in the settling chamber 5 is 0.5m/s, and the flue gas reaching the bottom of the settling chamber 5 turns upwards and flows from the flue gas to the bottom of the settling chamber 5. The gas outlet 8 is discharged; the unreacted catalyst slurry falls into the liquid collection chamber 6 and is discharged through the liquid discharge pipeline.

Sampling and testing the treated flue gas discharged from the flue gas outlet 8 shows that the concentration of SO ₂ in the flue gas is 50 mg/m ³ , the concentration of NO _x is 100 mg/m ³ , and the concentration of dust is 20 mg/m ³ , meeting the local emission standards.

Example 7

This embodiment provides a method for flue gas desulfurization and denitrification. The desulfurization, denitrification and dust removal system provided in the specific embodiment is used to perform desulfurization and denitration treatment on boiler flue gas. The concentration of SO ₂ in the industrial boiler flue gas to be treated is 800 mg/m ³ . The _NOx concentration is 300mg/m ³ , the dust concentration is 50mg/m ³ , and the treatment method specifically includes the following steps:

(I) The catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively deliver the catalyst slurry and compressed air to the dual-fluid injection device, and after being mixed in the dual-fluid injection device, the catalyst slurry and compressed air are sprayed into the desulfurization and denitrification reaction by the atomizing nozzle 3 Room 4;

Wherein, the catalyst slurry includes a catalyst and a solvent, the catalyst used is calcium peroxide, the solvent is a sodium carbonate solution, and the mass ratio of the catalyst and the solvent is 1:50 respectively. The volume ratio of catalyst slurry to compressed air is 1:570, the droplet diameter of the mixture of catalyst slurry and compressed air sprayed out by atomizing nozzle 3 is 18 μm, and the spray pressure of atomizing nozzle 3 is 0.6Mpa.

(II) Feed flue gas into the desulfurization and denitrification reaction chamber 4, and the mixture of flue gas, catalyst slurry and compressed air contacts the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification, and the residence time of the flue gas in the desulfurization and denitration reaction chamber 4 is 6s.

(Ⅲ) The flue gas after desulfurization and denitrification enters the settling chamber 5 and settles naturally. The flow velocity of the flue gas after desulfurization and denitrification in the settling chamber 5 is 0.5m/s, and the flue gas reaching the bottom of the settling chamber 5 turns upwards and flows from the flue gas to the bottom of the settling chamber 5. The gas outlet 8 is discharged; the unreacted catalyst slurry falls into the liquid collection chamber 6 and is discharged through the liquid discharge pipeline.

Sampling and testing the treated flue gas discharged from the flue gas outlet 8 shows that the concentration of SO ₂ in the flue gas is 50 mg/m ³ , the concentration of NO _x is 100 mg/m ³ , and the concentration of dust is 20 mg/m ³ , meeting the local emission standards.

Example 8

This embodiment provides a method for flue gas desulfurization and denitrification. The desulfurization, denitrification and dust removal system provided in the specific embodiment is used to perform desulfurization and denitration treatment on boiler flue gas. The concentration of SO ₂ in the industrial boiler flue gas to be treated is 500 mg/m ³ . The _NOx concentration is 200mg/m ³ , the dust concentration is 50mg/m ³ , and the treatment method specifically includes the following steps:

(I) The catalyst slurry preparation unit 13 and the compressed air supply unit 14 respectively deliver the catalyst slurry and compressed air to the dual-fluid injection device, and after being mixed in the dual-fluid injection device, the catalyst slurry and compressed air are sprayed into the desulfurization and denitrification reaction by the atomizing nozzle 3 Room 4;

Wherein, the catalyst slurry includes a catalyst and a solvent, the catalyst used is sodium chlorite, the solvent is a sodium bicarbonate solution, and the mass ratio of the catalyst and the solvent is 1:200 respectively. The volume ratio of the catalyst slurry to the compressed air is 1:600, the droplet diameter of the mixture of the catalyst slurry and the compressed air sprayed out by the atomizing nozzle 3 is 15 μm, and the spray pressure of the atomizing nozzle 3 is 0.6Mpa.

(II) Feed flue gas into the desulfurization and denitrification reaction chamber 4, and the mixed solution of flue gas, catalyst slurry and compressed air is contacted in the desulfurization and denitrification reaction chamber 4 to complete desulfurization and denitrification, and the residence time of the flue gas in the desulfurization and denitrification reaction chamber 4 is 6s.

(Ⅲ) The flue gas after desulfurization and denitrification enters the settling chamber 5 and settles naturally. The flow velocity of the flue gas after desulfurization and denitrification in the settling chamber 5 is 0.5m/s, and the flue gas that reaches the bottom of the settling chamber 5 turns upwards and flows from the flue gas to the bottom of the settling chamber 5. The gas outlet 8 is discharged; the unreacted catalyst slurry falls into the liquid collection chamber 6 and is discharged through the liquid discharge pipeline.

Sampling and testing the treated flue gas discharged from the flue gas outlet 8 shows that the concentration of SO ₂ in the flue gas is 50 mg/m ³ , the concentration of NO _x is 100 mg/m ³ , and the concentration of dust is 20 mg/m ³ , meeting the local emission standards.

The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and those skilled in the art should understand that any person skilled in the art should be aware of any disclosure in the present invention Within the technical scope, easily conceivable changes or substitutions all fall within the scope of protection and disclosure of the present invention.

Claims (10)

1. A desulfurization, denitrification and dust removal system activated by humidification, characterized in that, the desulfurization, denitration and dust removal system comprises a desulfurization, denitration and dust removal device, and the desulfurization, denitration and dust removal device comprises a desulfurization and denitration reaction chamber connected up and down along the flue gas flow direction and Settling chamber, the cylinder 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 dual-fluid injection device, and the dual-fluid injection device is used to inject catalyst slurry and compressed air into the desulfurization and denitrification reaction chamber. 2. The desulfurization, denitrification and dust removal system according to claim 1, characterized in that the height of the cylinder of the desulfurization and denitration reaction chamber extending into the settling chamber accounts for 1/3 to 1/2 of the overall height of the desulfurization and denitration reaction chamber. 3. The desulfurization, denitrification and dust removal system according to claim 1 or 2, characterized in that, the upper part of the desulfurization and denitrification reaction chamber is provided with a flue gas inlet; Preferably, a flue gas distribution plate is arranged inside the desulfurization and denitrification reaction chamber below the flue gas inlet; Preferably, the flue gas uniform distribution plate has an annular structure, the annular outer edge of the flue gas uniform distribution plate is close 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 close to the cylinder of the intake pipe The outer wall; the flue gas is evenly dispersed by the flue gas uniform distribution plate, and then contacts with the mixture of compressed air and catalyst slurry. 4. The desulfurization, denitrification and dust removal system according to any one of claims 1-3, characterized in that at least one flue gas outlet is arranged on the upper part of the settling chamber, and the flue gas is discharged through the bottom of the desulfurization and denitrification reaction chamber and then enters the sedimentation chamber After the flue gas reaches the bottom of the settling chamber, it turns back upwards and is discharged from the flue gas outlet. 5. The desulfurization, denitrification and dust removal system according to any one of claims 1-4, characterized in that, the dual-fluid injection device is a casing structure; Preferably, the dual-fluid injection device includes an inner liquid inlet pipe and an air inlet pipe sheathed on its outer side, and there is a delivery space for compressed air to flow between the liquid inlet pipe and the air inlet pipe; Preferably, a mixing area is left at the bottom of the air inlet pipe, and the catalyst slurry and compressed air are respectively injected through the liquid inlet pipe and the air inlet pipe and mixed in the mixing area before being sprayed out; Preferably, the bottom of the dual-fluid injection device is provided with an atomizing nozzle, and the catalyst slurry is mixed with compressed air and sprayed out from 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, characterized in that, 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 to drain line; Preferably, a drain valve is arranged on the drain pipeline. 7. The desulfurization, denitrification and dust removal system according to any one of claims 1-6, characterized in that, the humidification activated 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 to the liquid inlet of the liquid inlet pipe; The compressed air supply unit is connected to the air inlet of the air intake pipe. 8. The desulfurization, denitrification and dust removal system according to any one of claims 1-7, wherein the catalyst slurry preparation unit comprises a stirring device, a conveying device and a liquid flow detection device connected in sequence; Preferably, the compressed air supply device includes an air compressor and a gas flow detection device connected in sequence. 9. A method for flue gas desulfurization and denitrification using the desulfurization and denitrification dedusting system described in any one of claims 1-8, characterized in that the method comprises: In the desulfurization and denitrification reaction chamber, the mixture of catalyst slurry and compressed air sprayed by the dual-fluid injection device is in contact with the flue gas for desulfurization and denitrification. The flue gas after desulfurization and denitrification enters the settling chamber and settles naturally, and the flue gas after reaching the bottom of the settling chamber Turn up flow and discharge from the upper part of the settling chamber. 10. The method according to claim 9, characterized in that said method comprises: (I) The catalyst slurry preparation unit and the compressed air supply unit deliver the catalyst slurry and compressed air to the dual-fluid injection device respectively, and the catalyst slurry and compressed air are mixed in the dual-fluid injection device and sprayed into the desulfurization and denitrification reaction chamber by the atomizing nozzle; (II) Feed flue gas into the desulfurization and denitrification reaction chamber, and the mixture of flue gas, catalyst slurry and compressed air is contacted in the desulfurization and denitration reaction chamber to complete desulfurization and denitrification; (Ⅲ) The flue gas after desulfurization and denitrification enters the settling chamber to settle naturally, and the flue gas that reaches the bottom of the settling chamber flows upwards and is discharged from the flue gas outlet; the unreacted catalyst slurry falls into the liquid collection chamber and is discharged from the liquid discharge pipeline; Preferably, the catalyst slurry in step (I) includes a catalyst and a solvent; Preferably, the catalyst includes 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 includes 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 catalyst slurry to compressed air is 1:(400～600); Preferably, the droplet diameter of the mixture of catalyst slurry and compressed air sprayed out through the atomizing nozzle in step (I) is 15-50 μm; Preferably, the spray pressure of the atomizing nozzle described in step (I) is 0.3-0.6 MPa; Preferably, the residence time of flue gas in the desulfurization and denitrification reaction chamber in step (II) is 4-6s; Preferably, the flow velocity of the flue gas after desulfurization and denitrification in step (III) in the settling chamber is 0.5-1 m/s.