Condensation enhanced electrostatic precipitator

Abstract

The present application relates to a kind of condensation reinforced electrostatic cyclone dust collector, including the downward sealing communication of cylinder box, conical cylinder box and dust storage container in turn, discharge electrode extends to the top of the entrance of dust storage container, electrostatic atomizing nozzle is installed on the top of the entrance of dust storage container opposite to discharge electrode, the electrostatic atomizing nozzle is connected to the outside of dust storage container by pipeline, one condensing pipe entrance and one condensing pipe outlet are opened on the periphery of flue gas outlet pipe on port plate, condensing pipe that is spirally coiled into solenoid is put into cylinder box next to vertical pipe, condensing pipe bottom extends to the bottom of discharge electrode, the water inlet end of condensing pipe extends out of condensing pipe entrance, and the water outlet end of condensing pipe extends out of condensing pipe outlet.Cyclone dust collection, electrostatic dust removal, condensation dust removal and electrostatic spray dust removal are integrated, and multiple work does not affect each other.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flue gas dust removal, and particularly relates to a cyclone dust collector with multiple effects. BACKGROUND

[0002] The cyclone dust collector is a conventional dust removal device that separates solid particles from gas flow by centrifugal force generated by high-speed rotation of the gas, and is usually composed of five parts, i.e., an inlet section, a cylinder section, a conical section, a dust hopper and an overflow pipe. The cyclone dust collector has a good collection efficiency for dust particles larger than 10 microns, and has the advantages of simple structure, small floor area, low operation and maintenance costs, and the like. In addition, the cyclone dust collector can also adapt to high-temperature and high-pressure dust removal conditions, and has a relatively good particle efficiency for flue gas with a high dust concentration.

[0003] However, the conventional cyclone dust collector has a very low removal efficiency for fine particles, especially PM2.5 particles, because it only relies on centrifugal force to remove particles. In addition, the particles separated from the flue gas are deposited on the inner surface of the cyclone dust collector, and are easily carried away by the gas under the impact of high-speed airflow. In summary, the two technical problems of the cyclone dust collector are as follows: 1. low removal efficiency for fine particles, and 2. difficulty in cleaning the deposited particles and the risk of secondary entrainment. SUMMARY

[0004] The present application aims to provide a high-efficiency condensation-enhanced electrostatic cyclone dust collector, and aims to solve the problems of low removal efficiency for fine particles and difficulty in cleaning the deposited particles in the cyclone dust collector.

[0005] The technical scheme of the present application is: a condensation reinforced electrostatic cyclone dust collector, comprising a cylindrical box, a conical box and a dust storage container which are sequentially and downwardly sealed and communicated, the conical box has a structure that one end is large in size and the other end is small in size, the large-size end of the conical box is connected with the bottom end of the cylindrical box, the small-size end of the conical box is connected with the inlet of the dust storage container, a dust-containing wet flue gas inlet pipe is installed on one side of the cylindrical box, the top of the cylindrical box is sealed by a port plate, a through hole of a flue gas outlet is formed in the center of the port plate, a flue gas outlet pipe is sealingly arranged at the flue gas outlet, the flue gas outlet pipe has a "7" shaped double pipe structure, the vertical pipe of the flue gas outlet pipe is sealingly connected with the flue gas outlet, the top end of the vertical pipe is sealingly connected with the horizontal pipe, the other end of the horizontal pipe is an exhaust port, the center of the screw plug is inserted with a discharge electrode which extends above the inlet of the dust storage container, an electrostatic atomizing nozzle is installed above the inlet of the dust storage container and opposite to the discharge electrode, the electrostatic atomizing nozzle is connected to the outside of the dust storage container through a pipeline, a condensing pipe inlet and a condensing pipe outlet are formed in the periphery of the flue gas outlet pipe on the port plate, a condensing pipe which is spirally wound into a solenoid shape is arranged in the cylindrical box close to the vertical pipe, the bottom of the condensing pipe extends to the bottom of the discharge electrode, the water inlet end of the condensing pipe extends out of the condensing pipe inlet, and the water outlet end of the condensing pipe extends out of the condensing pipe outlet.

[0006] The further technical scheme of the present application is: the condensing pipe is spirally wound into two layers, the axial length of the inner layer is less than or equal to the axial length of the outer layer, and a double-layer spiral winding structure is formed.

[0007] The further technical scheme of the present application is: the ratio of the outer diameter of the solenoid formed by the condensing pipe to the inner diameter of the cylindrical box is less than or equal to 1:2.

[0008] The further technical scheme of the present application is: the lower end of the conical box is further reduced into a funnel shape and connected with the inlet of the dust storage container, the size of the interface is consistent with the inner diameter of the solenoid formed by the spiral winding of the condensing pipe.

[0009] The further technical scheme of the present application is: the dust storage container comprises a small bottle neck-shaped inlet and a large volume cavity, the bottom of the dust storage container is a flat cone, and the bottom is provided with a movable door.

[0010] The beneficial effects of the present application are: due to the above technical scheme, the condensing pipe divides the space into three parts, the inner part of the condensing pipe is a cooling water circulation space, the outer part of the solenoid formed by the condensing pipe is a cyclone space and a condensation space, and the inner part of the solenoid formed by the condensing pipe is an electrostatic dust removal space, and the following beneficial effects are achieved:

[0011] 1) Condensing tube surrounds the discharge electrode inside the electrostatic cyclone, isolates it from the cyclone space, so that it only discharges in the limited space formed by the condensing tube, so that the electrostatic enhancement effect can still be achieved without affecting the original flow field of the cyclone;

[0012] 2) The integration design of flue gas heat exchange and cyclone dust collector instead of the series arrangement of the two effectively saves the equipment space;

[0013] 3) The condensing tube condenses the wet flue gas entering the dust collector by taking advantage of the high water content in the combustion flue gas, which can promote the condensation of water vapor on the surface of fine particles to make them become larger particles, thereby realizing efficient removal of fine particles;

[0014] 4) The water vapor in the wet flue gas can condense on the inner wall of the dust collector to form a condensate film, which realizes self-cleaning of the surface without additional spraying, avoids dust accumulation affecting the operation of the dust collector, and the amount of condensate is related to the amount of flue gas. In this way, the more flue gas, the more particles removed, and the more water condensed, so that the flue gas quantity is self-adaptive;

[0015] 5) To further enhance the efficiency of fine particle removal, an electrostatic atomizing nozzle with opposite polarity to the discharge electrode is also provided, and the fine particles mixed with charged water mist enter the discharge area and collide with water mist with opposite polarity to realize more efficient removal. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a front view structural schematic diagram of the condensation enhanced electrostatic cyclone dust collector according to the present application;

[0017] Figure 2 is a front view structural schematic diagram of the condensation enhanced electrostatic cyclone dust collector according to the present application;

[0018] Figure 3 is a structural schematic diagram of the condensing tube with double-layer spiral winding structure;

[0019] Figure 4 is an experimental data graph of the condensation enhanced electrostatic cyclone dust collector according to the present application. DETAILED DESCRIPTION

[0020] The present application will be further described below in combination with the drawings and specific embodiments.

[0021] As Figure 1 and 2The condensation enhanced electrostatic cyclone dust collector comprises a cylindrical box 8, a conical cylinder box 3 and a dust storage container 5 which are sealed and communicated in sequence from top to bottom, the conical cylinder box has a structure with one end of large size and the other end of small size, the end of large size of the conical cylinder box is connected with the bottom end of the cylindrical box, and the end of small size of the conical cylinder box is connected with the inlet of the dust storage container, the cylindrical box 8 is provided with a dust-containing wet flue gas inlet pipe 2 on one side, the top of the cylindrical box 8 is sealed by a port plate, a through hole of the flue gas outlet is formed in the center of the port plate, a flue gas outlet pipe 10 is sealingly arranged at the flue gas outlet, the flue gas outlet pipe has a "7" shaped double pipe structure, the vertical pipe of the flue gas outlet pipe is sealingly connected with the flue gas outlet at the bottom end, the top end of the vertical pipe is sealingly connected with the horizontal pipe at the upper portion of the side surface, the other end of the horizontal pipe is an exhaust port, the center of the screw plug is inserted with a discharge electrode 7 which extends above the inlet of the dust storage container, an electrostatic atomizing nozzle 4 is arranged above the inlet of the dust storage container and opposite to the discharge electrode, the electrostatic atomizing nozzle is connected to the outside of the dust storage container through a pipeline, a condensing pipe inlet and a condensing pipe outlet are formed in the periphery of the flue gas outlet pipe on the port plate, a condensing pipe 6 which is spirally wound into a solenoid shape is arranged in the cylindrical box close to the vertical pipe, the bottom of the condensing pipe extends to the bottom of the discharge electrode, the water inlet end 1 of the condensing pipe extends out of the condensing pipe inlet, and the water outlet end 9 of the condensing pipe extends out of the condensing pipe outlet. The discharge electrode is connected to a power supply device outside the screw plug to control the discharge, the electrostatic atomizing nozzle is connected to the outside of the dust storage container through a pipeline and is controlled by a control device to work (power supply and water supply), and the condensing pipe is supplied with circulating water through a circulating system.

[0022] In the flue gas treatment process, the temperature of the dust-containing wet flue gas is between 50-120℃, the humidity of the flue gas is greater than 95%, the dust-containing wet flue gas enters the cyclone dust collector from the flue gas inlet, at the same time, the cooling water enters the condensing pipe from the water inlet end of the condensing pipe, and the temperature of the cooling water is 25℃. After the dust-containing wet flue gas enters the cylindrical box, it performs cyclone motion from top to bottom in the cyclone space between the condensing pipe and the conical cylinder box, in this process, the condensing pipe cools the wet flue gas, the water vapor in the flue gas condenses on the surface of the fine particles on one hand to promote the growth of the fine particles, and on the other hand, the water vapor in the flue gas condenses on the wall surface of the condensing pipe to form a continuous water film to clean the electrode plate; after this process, most of the particles are removed, and the fine particles which are difficult to remove pass through the area covered by the water mist sprayed by the electrostatic atomizing nozzle with the flue gas, further collide and agglomerate with the water mist, and then enter the cylindrical area surrounded by the condensing pipe, in this area, the discharge electrode discharges to charge the fine particles, and the fine particles migrate to the surface of the condensing pipe under the driving of the electric field force, and are finally removed with high efficiency, in this process, the condensation of the water vapor on the surface of the fine particles and the surface of the condensing pipe still occurs. Finally, the separated particles fall into the dust storage container with the water film, the temperature, humidity and particle concentration of the purified flue gas are greatly reduced, and the purified flue gas is discharged from the flue gas outlet.

[0023] As Figure 3The condensing tube comprises two layers, the axial length of the inner layer is not greater than that of the outer layer, forming a double-layer spiral winding structure, which has better cooling and sealing effects and is more conducive to the attachment and sliding of the water film. Cooling water enters the condensing tube from the water inlet end and flows out from the water outlet end. The discharge electrode is located in the middle of the condensing tube, and the electric field generated by the discharge electrode can charge the fine particles in the wet flue gas, changing the fine particles from neutral to charged, which is conducive to the removal of fine particles. Further, the distance between the adjacent two tubes of the inner layer spiral of the condensing tube is 1.5 times the diameter d of the condensing tube, so that the wet flue gas has a larger contact area, which is conducive to the condensation of water in the flue gas and improves the removal efficiency of fine particles.

[0024] The ratio of the outer diameter of the annular area (i.e. the solenoid tube) formed by the condensing tube to the inner diameter of the cylindrical box is ≤1:2. The larger the ratio, the better the condensing effect, but the cyclone effect will be reduced.

[0025] As Figure 4 shown, when only using a cyclone dust collector to capture fine particles, the PM2.5 particle removal efficiency is only 85%-90% at different wind speeds. When a high-voltage power supply is applied to the discharge electrode, the PM2.5 particle removal efficiency of the electrostatic cyclone dust collector can be improved to 80%-93%, and when cooling water is introduced for operation, the PM2.5 particle removal efficiency of the electrostatic cyclone dust collector + condensing can be improved to 95%-98%, and further when the electrostatic spray is operated, the PM2.5 particle removal efficiency can be improved to more than 99%.

[0026] The dust storage container comprises a small bottle neck-shaped inlet and a large volume cavity (more conducive to dust collection), and the bottom of the dust storage container is a flat cone with a movable door at the bottom (conducive to dust removal).

[0027] The lower end of the conical cylinder box is further reduced to a funnel shape and connected to the inlet of the dust storage container (conducive to dust collection), and the size of the interface is consistent with the inner diameter of the solenoid tube formed by the spiral winding of the condensing tube (this is the best space division, which minimizes the mutual influence between the condensing area and the electrostatic atomization area).

[0028] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A condensing enhanced electrostatic precipitator characterized by: The application relates to a dust collecting device, which comprises a cylindrical box body, a conical box body and a dust storage container which are sealed in sequence and communicate with each other, the conical box body is provided with a large-size end and a small-size end, the large-size end of the conical box body is connected with the bottom end of the cylindrical box body, the small-size end of the conical box body is connected with the inlet of the dust storage container, a dust-containing wet flue gas inlet pipe is arranged on one side of the cylindrical box body, the top of the cylindrical box body is sealed by a port plate, a through hole of a flue gas outlet is formed in the central position of the port plate, a flue gas outlet pipe is sealingly arranged at the flue gas outlet, the flue gas outlet pipe is provided with a "7" type double-pipe structure, the vertical pipe of the flue gas outlet pipe is sealingly connected with the flue gas outlet, the top end of the vertical pipe is sealingly connected with a screw plug, the upper side of the vertical pipe is sealingly connected with one end of the horizontal pipe, the other end of the horizontal pipe is a flue gas outlet, the center of the screw plug is inserted with a discharge electrode which extends above the inlet of the dust storage container, an electrostatic atomizing nozzle is arranged above the inlet of the dust storage container and opposite to the discharge electrode, the electrostatic atomizing nozzle is connected with the outside of the dust storage container through a pipeline, a condensing pipe inlet and a condensing pipe outlet are formed in the periphery of the flue gas outlet pipe of the port plate, a screw coil-shaped condensing pipe is arranged in the cylindrical box body and closely arranged with the vertical pipe, the bottom of the condensing pipe extends to the bottom of the discharge electrode, the water inlet end of the condensing pipe extends out of the condensing pipe inlet, and the water outlet end of the condensing pipe extends out of the condensing pipe outlet. The condensing pipe surrounds the discharge electrode in the electrostatic cyclone dust collector and separates the discharge electrode from a cyclone space.

2. A condensing enhanced electrostatic precipitator according to claim 1, wherein: The condensing pipe is spirally wound into two layers, the axial length of the inner layer is less than that of the outer layer, and a double-layer spiral winding structure is formed.

3. The condensing enhanced electrostatic precipitator of claim 1 wherein: The ratio of the outer diameter of the solenoid formed by the condensing pipe to the inner diameter of the cylindrical box body is less than or equal to 1:

2.

4. The condensing enhanced electrostatic precipitator according to any one of claims 1 to 3, characterized in that: The lower end of the conical box body is further reduced into a funnel shape and connected with the inlet of the dust storage container, the size of the interface is consistent with the inner diameter of the solenoid formed by the spiral winding of the condensing pipe.

5. A condensing enhanced electrostatic precipitator according to claim 4 wherein: The dust storage container comprises a small bottle neck-shaped inlet and a large-volume cavity, the bottom of the dust storage container is a flat cone, and the bottom is provided with a movable door.

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