CN111632760A - A device for strengthening SO3 agglomeration and removal based on charged water mist phase transition - Google Patents

Abstract

The invention proposes a device for strengthening SO ₃ agglomeration and removal based on the phase change of charged water mist. The mist area and the outlet end, the charged water mist area is equipped with a first power supply, the first power supply provides high-voltage negative electricity for the charged water mist area, and several A group of charging rings and several groups of first nozzles, the charging rings are arranged on one side of the spraying direction of the first nozzles, the wet electrostatic precipitator has a plurality of anode plates and cathode lines, the anode plates and cathode lines They are arranged in parallel with each other, an electric field channel is formed between the anode plate and the adjacent cathode lines, a plurality of second nozzles are arranged above the wet electrostatic precipitator, and a mist eliminator is arranged in the demisting area. The device improves the application range of the wet electrostatic precipitator to SO ₃ , and the electrostatic precipitator performance will not decrease when the concentration of SO ₃ reaches 50-100 mg/m ³ .

Description

A device for strengthening SO3 agglomeration and removal based on charged water mist phase transition

【Technical field】

The invention relates to the technical field of electric power environmental protection, in particular to a device for strengthening SO ₃ agglomeration and removal based on charged water mist phase transition.

【Background technique】

In the process of coal combustion, a part of sulfur is directly converted into sulfur trioxide (SO ₃ ), and a part of sulfur dioxide (SO ₂ ) is oxidized by catalytic reduction under high temperature conditions, and converted into sulfur trioxide (SO ₃ ). When sulfur trioxide reaches a certain concentration, it is easy to cause environmental pollution and aggravate smog when it is discharged into the atmosphere. After the sulfur trioxide enters the wet desulfurization tower, it forms aerosols, which are discharged through the chimney and form a "blue plume", which is the main cause of "acid rain". At present, the efficiency of the removal equipment for SO ₃ is relatively low, generally only about 20%.

In conventional wet electrostatic precipitators, when the inlet SO ₃ is too high, such as more than 50mg/m ³ , it will not only reduce the SO ₃ removal efficiency, but also the space charge effect of aerosol particles will also affect the discharge of the discharge electrode, resulting in the removal of particulate matter. The emission of particulate matter is difficult to meet the standard, and a device based on charged water mist phase change to strengthen SO ₃ agglomeration and removal is proposed.

[Content of the invention]

The purpose of the present invention is to solve the problems in the prior art, and to propose a device for strengthening SO ₃ agglomeration and removal based on charged water mist phase change, which can improve the applicable range _of wet electrostatic precipitators to SO ₃ . When it reaches 50～100mg/m ³ , the electrostatic precipitator performance will not decrease.

In order to achieve the above purpose, the present invention proposes a device for strengthening SO ₃ agglomeration and removal based on the phase change of charged water mist, including an inlet end, a diversion area, a charged water mist area, a wet The electrostatic precipitator, the defogging area and the outlet end, the charged water mist area is equipped with a first power supply, and the first power supply provides high-voltage negative electricity for the charged water mist area, and the charged water mist area is provided with a first power supply. There are several groups of charging rings and several groups of first nozzles evenly distributed inside, the charging rings are arranged on one side of the spraying direction of the first nozzles, the wet electrostatic precipitator has a plurality of anode plates and cathode lines, and the The anode plate and the cathode lines are arranged in parallel with each other, an electric field channel is formed between the anode plate and the adjacent cathode lines, a plurality of second nozzles are arranged above the wet electrostatic precipitator, and a demisting area is arranged in the demisting area. fogger.

Preferably, the charged water mist area is further provided with an ultrasonic atomizer, the ultrasonic atomizer is connected to a plurality of first nozzles through a plurality of water mist nozzles, and the charged ring is arranged at the first nozzle to spray The front end of the direction causes the droplets sprayed by the first nozzle to be instantly charged negatively, and the temperature of the droplets sprayed by the first nozzle is lower than the temperature of the flue gas.

Preferably, the first power supply provides 75kV high-voltage negative power for the charged water mist area, and the charged ring is connected to the first power supply, so that the small particle size in the flue gas passing through the charged water mist area can filter particulate matter , Sulfuric acid aerosol particles charged agglomeration.

Preferably, the charged water mist area is provided with two groups of charging rings in a staggered distribution along the direction of flue gas treatment, and each group of charging rings is composed of a plurality of uniformly distributed in the area where the inner channel section of the charged water mist area is located. composed of charged rings.

Preferably, the diversion area is in the shape of a bell mouth, and the cross-sectional area of the diversion area gradually increases along the flue gas treatment direction. The diversion area is provided with a number of first diversion plates arranged obliquely. A guide channel is formed between the two first guide plates, and the cross-sectional area of the guide channel increases gradually along the flue gas conveying direction.

Preferably, the defogging area is in the shape of a bell mouth, and the cross-sectional area of the defogging area gradually decreases along the flue gas treatment direction.

Preferably, the wet electrostatic precipitator is connected to a power source, a plurality of water collecting tanks are arranged below the wet electrostatic precipitator, the second nozzle is arranged above the anode plate and the cathode wire, and the second nozzle is connected to the spray nozzle. The spraying system is connected, and the spraying system supplies alkali liquid to the second nozzle through the spraying pipe.

Beneficial effects of the present invention: by setting the charged water mist area, the charged water mist can effectively promote the charged agglomeration of small-sized filterable particles and sulfuric acid aerosol particles, and the small temperature difference cooling process can promote the condensation of condensable particles. And; the final fine particles, sulfuric acid aerosol particles, and condensable particles are efficiently removed by the wet electrostatic precipitator, and the high-efficiency mist eliminator will efficiently remove the particles with a certain cutting particle size together with the droplets to effectively avoid their escape. The PM2.5 removal efficiency of the device can reach more than 80%, and the removal of condensable particulate matter (including SO ₃ ) can reach more than 70%, which effectively improves the application range of the wet electrostatic precipitator to SO _3. The concentration of SO ₃ When it reaches 50～100mg/m ³ , the electrostatic precipitator performance will not decrease. The device can be used for waste gas treatment in coal-fired power plants, chemical industry, metallurgy, cement and other industries, and can significantly reduce blue plume emissions.

The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

【Description of drawings】

FIG. 1 is a schematic diagram of the internal structure of a device of the present invention for enhancing SO ₃ agglomeration and removal based on charged water mist phase transition.

【Detailed ways】

Referring to FIG. 1, a device for strengthening SO ₃ agglomeration and removal based on the phase change of charged water mist according to the present invention includes an inlet end 1, a diversion area 2, a charged water mist area 3, a wet electric The dust collector 4, the mist removal area 5 and the outlet end 6, the charged water mist area 3 is equipped with a first power supply 31, and the first power supply 31 provides high-voltage negative electricity for the charged water mist area 3, so There are several groups of charging rings 32 and several groups of first nozzles 33 evenly distributed in the charged water mist area 3. The charged rings 32 are arranged on one side of the spraying direction of the first nozzles 33. The wet electrostatic precipitator 4 There are a plurality of anode plates 41 and cathode lines 42 inside, the anode plates 41 and cathode lines 42 are arranged in parallel with each other, and an electric field channel is formed between the anode plate 41 and the adjacent cathode lines 42, and the wet electrostatic precipitator 4 A plurality of second nozzles 43 are arranged above the hood, and a demister is arranged in the demister zone 5 .

Further, the charged water mist area 3 is also provided with an ultrasonic atomizer, and the ultrasonic atomizer is connected with a plurality of first nozzles 33 through a plurality of water mist nozzles, and the charged ring 32 is arranged on the first nozzle 33. The front end of the spraying direction of a nozzle 33 makes the droplets sprayed by the first nozzle 33 instantly charged negatively, and the temperature of the spray droplets sprayed by the first nozzle 33 is lower than the temperature of the flue gas. The first power supply 31 provides 75kV high-voltage negative electricity for the charged water mist area 3, and the charged ring 32 is connected to the first power supply 31, so that the small particle size in the flue gas passing through the charged water mist area 3 can be reduced. Filter particulate matter, charged agglomeration of sulfuric acid aerosol particles.

Further, the charged water mist area 3 is provided with two groups of charging rings 32 in a staggered distribution along the direction of flue gas treatment, and each group of charging rings 32 is evenly distributed in the charged water mist area 3 The charge ring 32 in the area where the channel cross section is located is formed.

Further, the guide area 2 is in the shape of a bell mouth, and the cross-sectional area of the guide area 2 is gradually increased along the flue gas treatment direction. The guide area 2 is provided with a number of first guide plates 21 that are arranged obliquely. , a guide channel is formed between two adjacent first guide plates 21 , and the cross-sectional area of the guide channel gradually increases along the flue gas conveying direction.

Further, the defogging area 5 is in the shape of a bell mouth, and the cross-sectional area of the defogging area 5 gradually decreases along the flue gas treatment direction.

Further, the wet electrostatic precipitator 4 is connected to a power source 40 , a plurality of water collecting tanks 44 are arranged below the wet electrostatic precipitator 4 , the second nozzle 43 is arranged above the anode plate 41 and the cathode wire 42 , The second nozzle 43 is connected to the spray system, and the spray system provides the second nozzle 43 with lye through the spray pipe.

The working process of the present invention:

The working process of the device for strengthening SO ₃ agglomeration and removal based on the phase change of charged water mist in the present invention: the flue gas enters from the inlet end 1, and is guided by the diversion area 2 into the charged water mist area 3; the charged water The fog area 3 supplies power to the charging ring 32 through 75kV high-voltage negative electricity, and the charging ring 32 is arranged at the front end of the spraying direction of the first nozzle 33, so that the droplets sprayed by the first nozzle 33 are instantly negatively charged; the charged water mist can effectively Promote the charged agglomeration of filterable particles and sulfuric acid aerosol particles with small particle size, and the cooling process of small temperature difference can promote the condensation of condensable particles; the final fine particles, sulfuric acid aerosol particles, and condensable particles are efficiently removed by wet electrostatic precipitator 4 , in the defogging zone 5, the high-efficiency demister will efficiently remove the particles with a certain cutting particle size together with the droplets, which can effectively avoid their escape, and the treated flue gas is discharged through the outlet end 6.

The device can be used for waste gas treatment in coal-fired power plants, chemical industry, metallurgy, cement and other industries, and can significantly reduce blue plume emissions. The removal efficiency of PM2.5 can reach more than 80%, and the removal of condensable particulate matter (including SO ₃ ) can reach more than 70%, which can effectively improve the application range _of wet electrostatic precipitator for SO ₃ . At 100mg/ ^m3 , the electrostatic precipitator performance of the wet electrostatic precipitator will not decrease.

The above-mentioned embodiments are illustrative of the present invention, not limitations of the present invention, and any scheme after simple transformation of the present invention belongs to the protection scope of the present invention.

Claims (7)

1. SO strengthening method based on charged water mist phase change₃The device of reunion desorption, its characterized in that: comprises an inlet end (1), a flow guide area (2), a charged water mist area (3), a wet electric dust collector (4), a demisting area (5) and an outlet end (6) which are sequentially arranged along the smoke treatment direction, wherein a first power supply (31) is arranged on the charged water mist area (3), the first power supply (31) provides high-voltage negative electricity for the charged water mist area (3), a plurality of groups of charged rings (32) and a plurality of groups of first nozzles (33) are uniformly distributed in the charged water mist area (3), the charged rings (32) are arranged on one side of the spraying direction of the first nozzles (33), a plurality of anode plates (41) and cathode wires (42) are arranged in the wet electric dust collector (4) in parallel, an electric field channel is formed between each anode plate (41) and the adjacent anode plate wire (42), a plurality of second nozzles (43) are arranged above the wet electric dust collector (4), a demister is arranged in the demisting zone (5).

2. The phase change enhanced SO based on charged water mist according to claim 1₃The device of reunion desorption, its characterized in that: the charged water mist area (3) is further provided with an ultrasonic atomizer, the ultrasonic atomizer is connected with the first nozzles (33) through a plurality of water mist spray pipes, the charging ring (32) is arranged at the front end of the spraying direction of the first nozzles (33), so that mist drops sprayed by the first nozzles (33) are charged with negative electricity instantly, and the temperature of the mist drops sprayed by the first nozzles (33) is lower than that of smoke.

3. The charged water mist-based phase change enhanced SO according to claim 1 or 2₃The device of reunion desorption, its characterized in that: the first power supply (31) provides 75kV high-voltage negative electricity for the charged water mist area (3), and the charged ring (32) is connected with the first power supply (31) so that small-particle-size filterable particles and sulfuric acid aerosol particles in the smoke passing through the charged water mist area (3) are charged and agglomerated.

4. A process as claimed in claim 1SO strengthening based on charged water mist phase change₃The device of reunion desorption, its characterized in that: two groups of charge rings (32) which are distributed in a staggered manner are arranged in the charge fog area (3) along the smoke treatment direction, and each group of charge rings (32) consists of a plurality of charge rings (32) which are uniformly distributed in the area where the cross section of the internal channel of the charge fog area (3) is located.

5. The phase change enhanced SO based on charged water mist according to claim 1₃The device of reunion desorption, its characterized in that: the flow guide area (2) is in a horn mouth shape, the cross section area of the flow guide area (2) is gradually increased along the flue gas treatment direction, a plurality of first flow guide plates (21) which are obliquely arranged are arranged in the flow guide area (2), a flow guide channel is formed between every two adjacent first flow guide plates (21), and the cross section area of the flow guide channel is gradually increased along the flue gas conveying direction.

6. The phase change enhanced SO based on charged water mist according to claim 1₃The device of reunion desorption, its characterized in that: the demisting area (5) is in a horn mouth shape, and the cross-sectional area of the demisting area (5) is gradually reduced along the flue gas treatment direction.

7. The phase change enhanced SO based on charged water mist according to claim 1₃The device of reunion desorption, its characterized in that: wet-type electrostatic precipitator (4) link to each other with power (40), the below of wet-type electrostatic precipitator (4) is equipped with a plurality of water catch bowl (44), second nozzle (43) set up in the top of anode plate (41) and negative pole line (42), second nozzle (43) link to each other with spraying system, and spraying system provides alkali lye for second nozzle (43) through the shower.

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