CN105251304B - Electrostatic agglomeration cyclone demisting device and application - Google Patents

Abstract

The invention relates to an electrostatic agglomeration swirl defogging device. The device includes electrostatic agglomeration swirl defogging units closely arranged in the tower, and each electrostatic agglomeration swirl demisting unit includes a cylinder body and a deflector. , Metal discharge wire, lower cylinder, upper cylinder, high pressure ring, nozzle, guide vane. This device can reduce the limit particle size of the demister and the effect of reducing the droplet concentration at the outlet of the demister. The flue gas to be treated enters the device from bottom to top, and the dust droplets in the flue gas are negatively charged when passing through the lower cylinder. When it is on the cylinder, it will grow together with the positively charged spray water mist, and when it passes through the guide vane, it will separate the liquid droplets in the flue gas from the flue gas according to the principle of aerodynamic swirl.

Description

An electrostatic agglomeration cyclone defogging device and its application

technical field

The invention belongs to the technical field of environmental protection equipment, and relates to a flue gas demisting device at the outlet of an absorption tower in wet flue gas desulfurization technology, in particular to an electrostatic agglomeration swirling flow defogging device and its application.

Background technique

As the country pays more and more attention to environmental protection issues, the country has issued the most stringent flue gas environmental protection standards in history in 2015, one of which requires the dust concentration of the net flue gas outlet to be below 5mg/Nm ³ , the existing wet desulfurization technology , The flue gas outlet carries a large amount of water, and the particles dissolved and suspended in the water are also entrained, which makes it difficult to meet the standards of this environmental protection standard. To solve this problem, the first thing to bear the brunt is to reduce the concentration of droplets carried by the flue gas outlet.

In order to reduce the discharge of droplets, the existing technical method is to install a demister on the top of the absorption tower. The existing demister is mostly in the form of a folded plate, and its demisting effect is better, and the limit particle size can reach about 25 microns. It is restricted by secondary entrainment, so it is very difficult to further reduce its limiting particle size.

Through searching, the following separate patent documents related to this patent application were found:

A cyclone electrostatic coupling high-efficiency dust and fog removal device and its application (CN104307634A), relating to a cyclone electrostatic coupling high-efficiency dust and fog removal device and its application, including a housing (1), a cyclone electrostatic dust and fog removal unit, and a fixed discharge electrode plate (8), ash flushing water pipe (9) and high-voltage DC power supply (10), the cyclone electrostatic dust removal and mist removal unit is arranged in the housing (1), and the discharge electrode fixing plate (8) is arranged in Above the cyclone electrostatic dedusting and demisting unit, the ash flushing water pipe (9) is arranged above the discharge electrode fixing plate (8), and the high-voltage DC power supply (10) is connected to the cyclone electrostatic dedusting and defogging unit. Compared with the prior art, the present invention combines the inward injection plate with the bottom swirl plate and spraying technology, which can significantly improve the purification degree of flue gas.

By comparison, this patent application is substantially different from the above-mentioned patent publications.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide an electrostatic agglomeration swirling demisting device that utilizes the working principle of pneumatic swirl and electrostatic demisting, reduces the limit particle size, and reduces the concentration of droplets at the outlet of the demister. , the device can be used in wet flue gas desulfurization, especially in the equipment of wet flue gas desulfurization, the function is to remove the free liquid droplets and dust contained in the flue gas after wet flue gas desulfurization.

The purpose of the present invention is achieved through the following technical solutions:

An electrostatic agglomeration swirl demisting device, the device includes electrostatic agglomeration swirl demisting units tightly arranged in the tower, each electrostatic agglomeration swirl demisting unit includes a cylinder body, a deflector, a metal discharge Electric wires, lower cylinder body, upper cylinder body, high-pressure ring, nozzles, guide vanes, the guide vanes and guide plates can be insulated, and the bottom of the cylinder body is coaxially provided with guide plates, which can The airflow entering the cylinder is rectified. The lower cylinder is coaxially arranged in the cylinder above the deflector. The top center of the lower cylinder is coaxially connected with a metal discharge wire. The inner wall of the cylinder has a high voltage Positive electricity, the metal discharge wire can emit negative ions, the upper cylinder is coaxially arranged in the cylinder above the metal discharge wire, the upper cylinder is cylindrical, and a nozzle is coaxially arranged at the top center of the upper cylinder, A high-pressure ring is arranged coaxially and closely on the inner wall of the cylinder outside the upper cylinder. The water mist sprayed by the nozzle passes through the middle of the high-pressure ring, and the positive ion water mist is obtained through the principle of high-pressure induction. The cylinder above the upper cylinder Guide vanes are arranged coaxially in the body.

Moreover, the number of the electrostatic agglomeration swirl demisting unit is one or more than two, and when the number of the electrostatic agglomeration swirl demisting unit is one, the electrostatic agglomeration swirl demisting units are arranged coaxially and closely in the tower;

When the number of electrostatic agglomeration swirl demisting units is more than two, the electrostatic agglomeration swirl demisting units are evenly spaced in the tower on the same horizontal plane, and each electrostatic agglomeration swirl demisting unit The central axis is set perpendicular to the horizontal plane, and the top and bottom of each adjacent electrostatic agglomeration swirl defogging unit are connected and sealed by a blocking plate 3, and the electrostatic agglomeration swirl defogger near the inner wall of the tower is sealed. The top and bottom of the barrel of the mist unit and the inner wall of the tower are also connected by a blocking plate.

Moreover, when the number of electrostatic agglomeration swirl defogging units is more than two, a plurality of metal discharge wires are connected to the power line, and the power line is coaxially fitted with an insulating tube, and the insulating tube passes through the upper cylinder A plurality of cylinders between the body and the lower cylinder are horizontally arranged on the tower.

Moreover, the cylinder body of the electrostatic agglomeration swirl defogging unit is a straight barrel structure with a length of 600mm-1000mm and an inner diameter of 300mm; or, the inner wall of the electrostatic agglomeration swirl defogging unit is smooth, and the material is FRP metal powder composite conductive material.

Moreover, the guide vanes are composed of a plurality of blades 6, which are symmetrically arranged on the vertical section of the cylinder with the centerline of the cylinder as the axis, and each blade has an included angle of 30-45 degrees with the horizontal direction.

Moreover, the deflector is a flat plate or a curved plate.

Moreover, the material of the guide plate or/and the guide vane is a smooth insulating material.

Application of the above-mentioned electrostatic agglomeration cyclone demisting device in wet flue gas desulfurization.

Moreover, the application of the electrostatic agglomeration cyclone demister device in removing free liquid droplet dust contained in flue gas after wet flue gas desulfurization.

Advantage and positive effect of the present invention are:

1. This device can reduce the limit particle size of the demister and the effect of reducing the droplet concentration at the outlet of the demister. The flue gas to be treated enters the device from bottom to top, and the dust droplets in the flue gas are negatively charged when passing through the lower cylinder. , When passing through the upper cylinder, after agglomerating with the positively charged spray water mist, when passing through the guide vane, according to the principle of aerodynamic swirl, the liquid droplets in the flue gas are separated from the flue gas.

2. When the device is in use, the processed flue gas enters the electrostatic agglomeration swirling demisting unit of the device from bottom to top. When passing through the lower cylinder, the metal discharge wire and the cylinder wall are connected to the negative and positive poles of the high-voltage power supply. The metal discharge wire releases a large amount of negative ions, and the negative ions move to the cylinder wall (positive electrode) regularly, and recombine with the free mist droplets in the flue gas during the movement, so that the free mist droplets move toward the cylinder wall (positive pole) under the action of Coulomb force. Moving, the removal efficiency of free droplets and dust reaches a certain effect. At the same time, the free mist and dust with negative ions continue to move upward. After the agglomeration grows, it passes through the guide vane segment, and under the action of the guide vane, a rotating updraft is formed, so that the velocity direction of the airflow is transformed into a tangential velocity, so that the liquid droplets in the airflow obtain centrifugal force and move towards the wall of the cylinder. Movement, under the action of the secondary removal, the removal efficiency of free droplets and dust reaches the best, not only can reduce the limit particle size, but also reduce the concentration of droplets at the outlet of the demister, under the combined action of pneumatic swirl and electrostatic dust removal Under this condition, the limit particle size of the liquid droplets captured by the device can be less than 10 microns, and, through the electrostatic defogging and pneumatic swirling methods, the amount of evaporated water in the flue gas of the desulfurization device is reduced, thereby achieving the effect of water saving.

3. When the number of electrostatic agglomeration swirl demisting units of this device is more than two, the electrostatic agglomeration swirl demisting units are evenly spaced in the tower on the same horizontal plane, and each electrostatic agglomeration swirl demisting unit The central axis of the unit is set perpendicular to the horizontal plane, and the top and bottom of each adjacent electrostatic agglomeration swirl demisting unit are connected and sealed by a blocking plate, and the electrostatic agglomeration swirl near the inner wall of the tower The top and bottom of the cylinder body of the demisting unit are also connected with the inner wall of the tower through a blocking plate. The adjacent electrostatic agglomeration swirl demisting units of the device, and between the electrostatic agglomeration swirl demisting unit and the inner wall of the tower are all connected and sealed by a blocking plate, so that the flue gas can only flow from bottom to top. The cylinder of the electrostatic agglomeration swirl demisting unit passes through, thereby ensuring the removal efficiency of the device’s free droplets and dust

4. When the number of electrostatic agglomeration swirling defogging units of this device is more than two, a plurality of metal discharge lines are connected to the power line, and the power line is coaxially fitted with an insulating tube, and the insulating tube passes through the Multiple cylinders between the upper cylinder and the lower cylinder are horizontally arranged on the tower. The setting of the power line enables multiple metal discharge wires to be connected to the power supply at the same time to generate negative ions, which is very convenient to use. At the same time, the insulation tube The arrangement not only prevents the power cord from falling down due to the gravity of multiple metal discharge wires, but also the insulation of the insulating tube will not affect the use of the device, further ensuring the use effect.

5. This device can be used in wet flue gas desulfurization, especially in equipment for wet flue gas desulfurization. Its function is to remove free liquid droplets and dust contained in flue gas after wet flue gas desulfurization.

Description of drawings

Fig. 1 is the structural connection semi-sectional view of the electrostatic agglomeration cyclone defogging device of the present invention;

Figure 2 is an enlarged schematic diagram of the structural connection of the electrostatic agglomeration swirl defogging unit in Figure 1;

Fig. 3 is an enlarged schematic top view of the structural connection viewed from the bottom of the upper cylinder in Fig. 1 .

detailed description

Hereinafter, the present invention will be further described in detail by taking the embodiment of the accompanying drawings as an example. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

An electrostatic agglomeration swirl defogging device, as shown in Figure 1, Figure 2 and Figure 3, said device includes an electrostatic agglomeration swirl defogging unit 2 tightly arranged in the tower 1, each electrostatic agglomeration swirl The flow defogging unit includes a cylinder body 5, a guide plate 12, a metal discharge wire 10, a lower cylinder body 11, an upper cylinder body 8, a high pressure ring 9, a nozzle 7, a guide vane 6, and the guide vane and the guide plate can be insulated, the bottom of the cylinder is coaxially provided with a deflector, and the deflector can rectify the airflow entering the cylinder, and the lower cylinder is coaxially arranged in the cylinder above the deflector. The top center of the cylinder is coaxially connected with a metal discharge line, the inner wall of the cylinder is charged with high voltage positive, the metal discharge line can release negative ions, and the upper cylinder is coaxially arranged in the cylinder above the metal discharge line, The upper cylinder is in the shape of an inverted funnel. A nozzle is coaxially arranged at the top center of the upper cylinder. A high-pressure ring is coaxially and closely arranged on the inner wall of the cylinder outside the upper cylinder. The water mist sprayed by the nozzle passes through the middle of the high-pressure ring. , through the principle of high pressure induction, positive ion water mist is obtained, and guide vanes are coaxially arranged in the cylinder above the upper cylinder.

This device can reduce the limit particle size of the demister and the effect of reducing the droplet concentration at the outlet of the demister. The flue gas to be treated enters the device from bottom to top, and the dust droplets in the flue gas are negatively charged when passing through the lower cylinder. When it is on the cylinder, it will grow together with the positively charged spray water mist, and when it passes through the guide vane, it will separate the liquid droplets in the flue gas from the flue gas according to the principle of aerodynamic swirl.

When the device is in use, the treated flue gas enters the electrostatic agglomeration swirling demisting unit of the device from bottom to top. When passing through the lower cylinder, the metal discharge wire and the cylinder wall are connected to the negative and positive electrodes of the high-voltage power supply. The wire releases a large amount of negative ions, and the negative ions move to the cylinder wall (positive electrode) regularly, and recombine with the free mist droplets in the flue gas during the movement, so that the free mist droplets move to the cylinder wall (positive pole) under the action of Coulomb force. The removal efficiency of free droplets and dust reaches a certain effect, and at the same time, the free droplet dust with negative ions continues to move upward, and when passing through the upper cylinder, it combines with the positive ion water mist sprayed by the nozzle under the action of the high-pressure ring After growing up, through the guide vane segment, under the action of the guide vane, a rotating upward airflow is formed, so that the velocity direction of the airflow is transformed into a tangential velocity, so that the droplets in the airflow obtain centrifugal force and move towards the cylinder wall. Under the effect of secondary removal, the removal efficiency of free liquid droplets and dust reaches the best, which can not only reduce the limit particle size, but also reduce the droplet concentration at the outlet of the mist eliminator. Under the combined action of pneumatic swirl and electrostatic dust removal, The limit particle size of the liquid droplets collected by the device can be less than 10 microns, and the evaporation water volume of the flue gas of the desulfurization device is reduced through the electrostatic defogging and pneumatic swirling methods, thereby achieving the effect of water saving.

In this embodiment, the number of the electrostatic agglomeration swirl demisting unit is one or more than two, when the number of the electrostatic agglomeration swirl demisting unit is one, the electrostatic agglomeration swirl demisting unit The coaxial is closely arranged in the tower;

When the number of electrostatic agglomeration swirl demisting units is more than two, the electrostatic agglomeration swirl demisting units are evenly spaced in the tower on the same horizontal plane, and each electrostatic agglomeration swirl demisting unit The central axis is set perpendicular to the horizontal plane, and the top and bottom of each adjacent electrostatic agglomeration swirl defogging unit are connected and sealed by a blocking plate 3, and the electrostatic agglomeration swirl defogger near the inner wall of the tower is sealed. The top and bottom of the barrel of the mist unit and the inner wall of the tower are also connected by a blocking plate. The adjacent electrostatic agglomeration swirl demisting units of the device, and between the electrostatic agglomeration swirl demisting unit and the inner wall of the tower are all connected and sealed by a blocking plate, so that the flue gas can only flow from bottom to top. The electrostatic agglomeration swirling flow demisting unit passes through the cylinder body, thereby ensuring the removal efficiency of the device’s free droplets and dust.

In this embodiment, when the number of electrostatic agglomeration swirl defogging units is more than two, a plurality of metal discharge wires are connected to the power line 4, and the power line is coaxially sleeved with an insulating tube. The tube passes through multiple cylinders between the upper cylinder and the lower cylinder and is horizontally arranged on the tower. The setting of the power cord enables multiple metal discharge wires to be connected to the power supply at the same time to generate negative ions, which is extremely convenient to use and at the same time The arrangement of the insulating tube not only prevents the power cord from falling down due to the gravity of multiple metal discharge wires, but also the insulation of the insulating tube will not affect the use of the device, further ensuring the use effect.

In this embodiment, the cylinder body of the electrostatic agglomeration swirl defogging unit is a straight barrel structure with a length of 600mm-1000mm and an inner diameter of 300mm; or, the inner wall of the electrostatic agglomeration swirl defogging unit Smooth, the material is glass fiber reinforced plastic metal powder composite conductive material.

In this embodiment, the guide vanes are composed of a plurality of vanes 6, which are symmetrically arranged on the vertical section of the cylinder with the centerline of the cylinder as the axis, and each vane has an included angle of 30-45 degrees with the horizontal direction.

In this embodiment, the deflector is a flat plate or a curved plate.

In this embodiment, the material of the guide plate or/and the guide vane is a smooth insulating material.

The device of the invention can be used in wet flue gas desulfurization equipment, and is used to remove free liquid droplets contained in flue gas after wet flue gas desulfurization.

Claims (6)

1. An electrostatic agglomeration swirl defogging device, characterized in that: the device includes an electrostatic agglomeration swirl demisting unit closely arranged in the tower, and each electrostatic agglomeration swirl demisting unit includes a cylinder, Deflector, metal discharge wire, high-voltage ring, nozzle, guide vane, the cylinder includes a lower cylinder and an upper cylinder, the guide vane and the guide plate can be insulated, the bottom of the cylinder is the same A deflector is arranged on the axis, and the deflector can rectify the airflow entering the cylinder. The lower cylinder is coaxially arranged in the cylinder above the deflector. The top center of the lower cylinder is coaxially connected with a metal Discharge wire, the inner wall of the cylinder is charged with high voltage positive, the metal discharge wire can release negative ions, the upper cylinder is coaxially arranged in the cylinder above the metal discharge wire, the upper cylinder is cylindrical, the upper A nozzle is coaxially arranged at the top center of the cylinder, and a high-pressure ring is coaxially and closely arranged on the inner wall of the cylinder outside the upper cylinder. The water mist sprayed by the nozzle passes through the middle of the high-pressure ring, and the positive Ionic water mist, guide vanes are coaxially arranged in the cylinder above the upper cylinder; The number of the electrostatic agglomeration swirl demisting unit is one or more than two. When the number of the electrostatic agglomeration swirl demisting unit is one, the electrostatic agglomeration swirl demisting unit is coaxially and closely arranged on the tower Inside; When the number of electrostatic agglomeration swirl demisting units is more than two, the electrostatic agglomeration swirl demisting units are evenly spaced in the tower on the same horizontal plane, and each electrostatic agglomeration swirl demisting unit The central axis is set perpendicular to the horizontal plane, and the top and bottom of each adjacent electrostatic agglomeration swirl demisting unit are connected and sealed by a blocking plate, and the electrostatic agglomeration swirl demisting near the inner wall of the tower The top and bottom of the cylinder of the unit and the inner wall of the tower are also connected by a plugging plate; When the number of electrostatic agglomeration swirl defogging units is more than two, a plurality of metal discharge wires are connected to the power line, and the power line is coaxially fitted with an insulating tube, and the insulating tube passes through the upper cylinder and the Multiple cylinders between the lower cylinders are horizontally arranged on the tower; The cylinder body of the electrostatic agglomeration swirl defogging unit is a straight barrel structure, the length is 600mm-1000mm, and the inner diameter is 300mm; or, the inner wall of the electrostatic agglomeration swirl defogging unit is smooth, and the material is glass fiber reinforced plastic metal Powder composite conductive material. 2. The electrostatic agglomeration swirling defogging device according to claim 1, characterized in that: the guide vane is composed of a plurality of vanes, which are symmetrically arranged on the vertical section of the cylinder with the centerline of the cylinder as the axis, Each blade has an included angle of 30-45 degrees with the horizontal direction. 3. The electrostatic agglomeration cyclone defogging device according to claim 1, characterized in that: the deflector is a flat plate or a curved plate. 4. The electrostatic agglomeration swirl defogging device according to claim 1, characterized in that: the material of the guide plate or/and guide vane is a smooth insulating material. 5. The application of the electrostatic agglomeration cyclone demisting device according to any one of claims 1 to 4 in wet flue gas desulfurization. 6. The application of the electrostatic agglomeration swirl defogging device in wet flue gas desulfurization according to claim 5, characterized in that: the electrostatic agglomeration swirl defogging device is used after wet flue gas desulfurization The application of free liquid droplets contained in the flue gas.