Flue gas ultra-low emission dust removal device and dust removal method

Abstract

The invention relates to the technical field of flue gas treatment, in particular to a flue gas ultra-low emission dust removal device and a dust removal method.The flue gas ultra-low emission dust removal device comprises a dust removal box, an electrostatic dust removal mechanism for flue gas dust removal is arranged in the dust removal box, and the electrostatic dust removal mechanism comprises a cathode plate and an anode tube; the outer peripheral surface of the anode tube protrudes from top to bottom to form a plurality of anode turbulent flow parts, a rotational flow mechanism is arranged below the electrostatic dust collection mechanism, a plurality of fan blades are arranged on the outer end surface of the fan blade frame in the circumferential direction, and an air inlet communicated with the dust collection cavity is formed in the side wall of the dust collection box body on one side of the fan blade frame; the dust collector has the beneficial effects that airflow collides with the inner wall of the dust collection box body, and part of particulate matters are separated from the airflow under the action of gravity, so that primary dust collection operation is assisted, the flow speed of gas discharged upwards is reduced, the flow of dust collection gas flowing into an electrostatic dust collection mechanism is reduced, the dust collection efficiency is improved, and the dust discharge amount is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas treatment, and particularly to a flue gas ultra-low emission dust removal device and a dust removal method. Background Technique

[0002] Flue gas ultra-low emission means that through advanced environmental protection technologies and equipment, the pollutant emission concentration in the flue gas generated by the combustion of fossil fuels such as coal and oil is reduced to an extremely low level to achieve the purpose of protecting the environment and human health. The development of flue gas ultra-low emission technology has gone through multiple stages, and dust removal is also one of the stages.

[0003] For the dust removal treatment of large-volume flue gas, currently, an electrostatic precipitator is usually used for dust removal operations. In actual use, it is found that the dust removal efficiency of the electrostatic precipitator is greatly affected by the gas flow rate. Currently, the flue gas is directly discharged into the electrostatic precipitator through a straight pipe, and then directly discharged after being dust-removed by the electrostatic dust removal mechanism. When the gas flow rate is too fast, it will affect the dust collection effect of the electrostatic dust removal mechanism and the overall dust removal quality. In view of this, a flue gas ultra-low emission dust removal device is proposed. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a flue gas ultra-low emission dust removal device and a dust removal method. A swirl mechanism is arranged below the electrostatic dust removal mechanism in the dust removal box body. An air inlet is arranged on the side of the dust removal box body of one side of the swirl mechanism. When the gas is discharged into the dust removal box body through the air inlet, during the rotation of the swirl mechanism, with the help of the centrifugal force, the air flow will collide with the inner wall of the dust removal box body, and part of the particulate matter will be separated from the air flow under the action of gravity, realizing the auxiliary preliminary dust removal operation, reducing the upward discharge flow rate of the gas, reducing the dust removal gas flow rate flowing into the electrostatic dust removal mechanism, and improving the dust collection efficiency.

[0005] In order to achieve the above purpose, the present invention is implemented by adopting the following technical solutions:

[0006] A flue gas ultra-low emission dust removal device includes a dust removal box body. An electrostatic dust removal mechanism is arranged in the dust removal box body. The electrostatic dust removal mechanism includes a cathode plate and an anode tube. A plurality of anode turbulence parts protrude from the outer peripheral surface of the anode tube from top to bottom. A swirl mechanism is arranged below the electrostatic dust removal mechanism. The swirl mechanism includes a bracket, a rotating shaft and a fan blade frame. The bracket is arranged on the inner wall of the dust removal box body. A rotating shaft is arranged on the bracket. A fan blade frame is arranged at the top of the rotating shaft. A plurality of fan blades are circumferentially arranged on the outer end surface of the fan blade frame. An air inlet is arranged on the side wall of the dust removal box body on one side of the fan blade frame.

[0007] Further, the flue gas ultra-low emission dust removal device further includes a spray pipe and spray nozzles. A spray pipe is arranged above the electrostatic dust removal mechanism in the dust removal box body. One end of the spray pipe extends out of the dust removal box body and is connected to an external water supply system. A number of spray nozzles are arranged at the bottom of the spray pipe.

[0008] Further, the flue gas ultra-low emission dust removal device further includes a receiving hopper, an electric discharge valve and a flexible connection flange. A receiving hopper is arranged at the bottom of the dust removal box body. The discharge end at the bottom of the receiving hopper is connected to the electric discharge valve. A flexible connection flange is arranged at the discharge end of the electric discharge valve.

[0009] Further, the electrostatic dust removal mechanism includes a plurality of cathode plates arranged at intervals. A dust removal channel is formed by surrounding between two adjacent cathode plates. An anode tube is arranged vertically along the center of the dust removal channel.

[0010] Further, an exhaust port is arranged on the side of the dust removal box body above the electrostatic dust removal mechanism.

[0011] Further, a maintenance port is arranged on the side wall of the dust removal box body.

[0012] Further, a maintenance ladder is arranged vertically on the outer wall of the dust removal box body.

[0013] Further, a plurality of support legs are arranged circumferentially at the bottom of the dust removal box body.

[0014] Further, the dust removal method of the flue gas ultra-low emission dust removal device includes the following steps:

[0015] S1. When the gas is discharged into the dust removal box body through the air inlet, affected by the gas, the swirl mechanism will be driven to rotate. During the rotation of the swirl mechanism, the waste gas can be driven to make a rotational motion. With the action of centrifugal force, the air flow will collide with the inner wall of the dust removal box body, and part of the particulate matter will be separated from the air flow under the action of gravity;

[0016] S2. When the gas entering the dust removal box body rotates and flows in a direction away from the swirl mechanism, the upward discharge flow rate of the gas is reduced. The gas flows through the electrostatic dust removal mechanism, and the cathode plate and anode tube of the electrostatic dust removal mechanism are energized for dust removal;

[0017] S3. The dust removal gas passing through the electrostatic dust removal mechanism is discharged into the pipeline through the exhaust port for emission.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1) When the gas is discharged into the dust removal box through the air inlet, affected by the gas, it will drive the rotation of the swirl mechanism. During the rotation of the swirl mechanism, it can drive the waste gas to make a rotational motion. With the action of centrifugal force, the air flow will collide with the inner wall of the dust removal box. Part of the particulate matter will be separated from the air flow under the action of gravity, realizing the auxiliary preliminary dust removal operation. The dust removal efficiency is high, the dust removal effect is good, no additional power is required, and energy consumption is saved.

[0020] 2) During the process of the gas rotating and flowing away from the swirl mechanism, the upward discharge velocity of the gas will also be reduced, and the flow rate of the dust removal gas flowing into the electrostatic dust removal mechanism will be decreased, which can improve the dust collection effect of the electrostatic dust removal mechanism, improve the dust collection efficiency, reduce the dust emission, and meet the surrounding environmental protection requirements.

[0021] 3) The multiple anode turbulators on the anode tube can buffer the upward movement of the gas, slow down the rising speed of the air flow, increase the gas dust removal time, and at the same time increase the contact area between the gas and the anode tube, improve the electrostatic dust removal efficiency, increase the dust removal amount, and thus improve the overall electrostatic dust removal effect. Description of the Drawings

[0022] Figure 1 It is a system diagram of a flue gas ultra-low emission dust removal device described in the present invention.

[0023] Figure 2 It is a cross-sectional view of the swirl mechanism described in the present invention.

[0024] Figure 3 It is a structural diagram of the fan blade frame described in the present invention.

[0025] In the figure: 1. Spray pipe; 2. Spray head; 3. Exhaust port; 4. Maintenance ladder; 5. Dust removal box; 6. Cathode plate; 7. Anode tube; 71. Anode turbulator; 8. Air inlet; 9. Feeding hopper; 10. Electric discharge valve; 11. Flexible connection flange; 12. Swirl mechanism; 121. Fan blade frame; 122. Bracket; 123. Rotating shaft; 124. Fan blade; 13. Support leg; 14. Inspection port. Detailed Embodiments

[0026] The following further describes the detailed embodiments of the present invention with reference to the drawings:

[0027] As Figures 1-3 shown, the working principle of a flue gas ultra-low emission dust removal device: When the gas enters the dust removal box 5 through the air inlet, the gas drives the swirl mechanism 12 to rotate. During the rotation of the swirl mechanism 12, with the action of centrifugal force, the air flow will collide with the inner wall of the dust removal box 5. The swirl mechanism 12 rotates, and the gas entering the dust removal box 5 flows away from the swirl mechanism 12. The gas with reduced flow rate passes through the electrostatic dust removal mechanism for dust removal, improving the electrostatic dust removal rate and having a good dust removal effect.

[0028] As shown Figures 1-3 in the figure, a flue gas ultra-low emission dust removal device includes a dust removal box body 5. An electrostatic dust removal mechanism is arranged inside the dust removal box body 5. The electrostatic dust removal mechanism includes a cathode plate 6 and an anode tube 7. A plurality of anode turbulence parts 71 are formed by protruding from the outer peripheral surface of the anode tube 7 from top to bottom. While the plurality of anode turbulence parts 71 can play a buffering role in the upward movement of the gas, they can also increase the contact area between the gas and the anode tube 7, thereby improving the overall electrostatic dust removal effect. A swirl mechanism 12 is arranged below the electrostatic dust removal mechanism. The swirl mechanism 12 includes a bracket 122, a rotating shaft 123 and a fan blade frame 121. The bracket 122 is installed on the inner wall of the dust removal box body 5. A bearing is installed on the bracket 122. The bottom end of the rotating shaft 123 is rotatably arranged on the bearing. The top of the rotating shaft 123 is fixed in the reserved installation hole in the center of the fan blade frame 121. The fan blade frame 121 is arranged at the top of the rotating shaft 123. A plurality of fan blades 124 are circumferentially arranged on the outer end surface of the fan blade frame 121. An air inlet 8 is arranged on the side wall of the dust removal box body on one side of the fan blade frame 121. When the waste gas is discharged into the dust removal box body 5 through the air inlet 8, under the action of the impact force of the air flow, a driving force will be given to the fan blades 124 themselves, and then the rotating shaft 123 will be driven to rotate on the bearing, thereby realizing the swirl operation of the swirl mechanism 12. During the rotation of the swirl mechanism 12, the waste gas can be driven to make a rotational movement. With the action of centrifugal force, the air flow will collide with the inner wall of the dust removal box body 5. Part of the particulate matter will be separated from the air flow under the action of gravity, realizing the auxiliary preliminary dust removal operation. At the same time, during the process of the gas rotating and flowing away from the swirl mechanism 12, the upward discharge flow rate of the gas will also be reduced, which can improve the dust collection effect of the subsequent electrostatic dust removal mechanism. In addition, the driving source of the swirl mechanism 12 comes from the gas itself, which can also reduce the manufacturing cost and subsequent maintenance cost of the swirl mechanism 12 itself.

[0029] Furthermore, the flue gas ultra-low emission dust removal device further includes a spray pipe 1 and spray nozzles 2. The spray pipe 1 is arranged above the electrostatic dust removal mechanism inside the dust removal box body 5. One end of the spray pipe 1 extends out of the dust removal box body 5 and is connected to an external water supply system. A plurality of spray nozzles 2 are arranged at the bottom of the spray pipe 1. The spray nozzles 2 correspond to the dust removal channels one by one. The external water supply system can be a water tank with a water pump, a tap water pipeline, etc. When there is more particulate matter attached to the surface of the cathode plate 6, water is supplied to the spray pipe 1 through the external water supply system, and then sprayed downward through the spray nozzles 2, so as to clean the cathode plate 6 to ensure the subsequent dust removal quality of the electrostatic dust removal mechanism.

[0030] Further, the flue gas ultra-low emission dust removal device further includes a receiving hopper 9, an electric discharge valve 10 and a flexible connection flange 11. A receiving hopper 9 is provided at the bottom of the dust removal box body 5. The discharge end at the bottom of the receiving hopper 9 is connected to the electric discharge valve 10, and a flexible connection flange 11 is provided at the discharge end of the electric discharge valve 10. When the accumulated particulate matter in the receiving hopper is excessive, the electric discharge valve 10 can be opened to discharge the internal particulate matter to complete the discharging operation.

[0031] Further, the electrostatic dust removal mechanism includes a plurality of cathode plates 6 arranged at intervals. A dust removal channel is formed by enclosing between two adjacent cathode plates 6. An anode tube 7 is vertically arranged along the center of the dust removal channel. When the waste gas passes through the anode tube 7, the particulate matter in the waste gas becomes charged, causing the particulate matter to move towards the cathode plate 6 and adhere to the cathode plate 6, thereby realizing the electrostatic dust removal operation.

[0032] Further, an exhaust port 3 is provided on the side of the dust removal box body 5 above the electrostatic dust removal mechanism.

[0033] Further, a maintenance port 14 is provided on the side wall of the dust removal box body 5.

[0034] Further, a maintenance ladder 4 is vertically arranged on the outer wall of the dust removal box body 5.

[0035] Further, a plurality of support legs 13 are circumferentially arranged at the bottom of the dust removal box body 5.

[0036] As Figures 1-3 shown, a dust removal method for a flue gas ultra-low emission dust removal device includes the following contents:

[0037] S1. When the gas is discharged into the dust removal box body 5 through the air inlet 8, affected by the gas, it will drive the rotation of the swirl mechanism 12. During the rotation of the swirl mechanism 12, it can drive the waste gas to make a rotational motion. With the action of centrifugal force, the air flow will collide with the inner wall of the dust removal box body 5, and part of the particulate matter will be separated from the air flow under the action of gravity;

[0038] S2. When the gas entering the dust removal box body 5 rotates and flows in a direction away from the swirl mechanism 12, the upward discharge flow rate of the gas is reduced. The gas flows through the electrostatic dust removal mechanism, and the cathode plate 6 and the anode tube 7 of the electrostatic dust removal mechanism are energized for dust removal;

[0039] S3. The dust removal gas passing through the electrostatic dust removal mechanism is discharged into the pipeline through the exhaust port 3 for emission.

[0040] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A flue gas ultra-low emission dust removal device, comprising a dust removal box body, wherein an electrostatic dust removal mechanism is arranged in the dust removal box body, and is characterized in that, The described electrostatic dust removal mechanism includes a cathode plate and an anode tube. Multiple anode turbulence parts are formed by protruding from the outer peripheral surface of the anode tube from top to bottom. A swirl mechanism is arranged below the electrostatic dust removal mechanism. The swirl mechanism includes a bracket, a rotating shaft and a fan blade frame. The bracket is arranged on the inner wall of the dust removal box body. A rotating shaft is arranged on the bracket. A fan blade frame is arranged at the top of the rotating shaft. A number of fan blades are circumferentially arranged on the outer end surface of the fan blade frame. An air inlet is arranged on the side wall of the dust removal box body on one side of the fan blade frame.

2. The flue gas ultra-low emission dust removal device according to claim 1, characterized in that, The described flue gas ultra-low emission dust removal device further includes a spray pipe and spray nozzles. A spray pipe is arranged above the electrostatic dust removal mechanism in the dust removal box body. One end of the spray pipe extends out of the dust removal box body and is connected to an external water supply system. A number of spray nozzles are arranged at the bottom of the spray pipe.

3. A flue gas ultra-low emission dust removal device according to claim 1, characterized in that, The described flue gas ultra-low emission dust removal device further includes a receiving hopper, an electric discharge valve and a flexible connection flange. A receiving hopper is arranged at the bottom of the dust removal box body. The discharging end at the bottom of the receiving hopper is connected to an electric discharge valve. A flexible connection flange is arranged at the discharging end of the electric discharge valve.

4. A flue gas ultra-low emission dust removal device according to claim 1, characterized in that, The described electrostatic dust removal mechanism includes a plurality of cathode plates arranged at intervals. A dust removal channel is formed by enclosing between two adjacent cathode plates. An anode tube is arranged vertically along the center of the dust removal channel.

5. The flue gas ultra-low emission dust removal device according to claim 1, characterized in that, An exhaust port is arranged on the side surface of the dust removal box body above the electrostatic dust removal mechanism.

6. A flue gas ultra-low emission dust removal device according to claim 1, characterized in that, An inspection port is arranged on the side wall of the dust removal box body.

7. An ultra-low emission dust removal device for flue gas according to claim 1, characterized in that, A maintenance ladder is arranged vertically along the outer wall of the dust removal box body.

8. An ultra-low emission dust removal device for flue gas according to claim 1, characterized in that, A plurality of support legs are arranged circumferentially at the bottom of the dust removal box body.

9. A dust removal method for the flue gas ultra-low emission dust removal device according to claim 1, characterized in that, The dust removal method of the described flue gas ultra-low emission dust removal device includes the following contents: S1. When the gas is discharged into the dust removal box body through the air inlet, affected by the gas, it will drive the swirl mechanism to rotate. During the rotation of the swirl mechanism, it can drive the waste gas to make a rotational motion. With the action of centrifugal force, the air flow will collide with the inner wall of the dust removal box body, and part of the particulate matter will be separated from the air flow under the action of gravity. S2. During the process of the gas entering the dust removal box body and rotating and flowing away from the swirl mechanism, the upward discharge flow rate of the gas is reduced. The gas flows through the electrostatic dust removal mechanism, and the cathode plate and anode tube of the electrostatic dust removal mechanism are energized for dust removal. S3. The dust removal gas passing through the electrostatic dust removal mechanism is discharged into the pipeline through the exhaust port for emission.

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