A rinse-free wet-type electric dust collector

Abstract

This invention discloses a non-rinsing wet electrostatic precipitator, comprising an electrostatic precipitator shell, a cooling water tank, and a circulating pump. An anode device is disposed inside the electrostatic precipitator shell, comprising multiple interconnected anode tube layers in a honeycomb structure. An anode tube is disposed inside each anode tube layer, with the gap between them forming a cooling water channel. An outlet chamber plate and an inlet chamber plate are respectively disposed at the upper and lower ends of the anode device. Each cooling water channel communicates with the internal space of the inlet and outlet chamber plates. The outlet of the outlet chamber plate is connected to the inlet of the inlet chamber plate via the cooling water tank and the circulating pump, forming a cooling water circulation loop. A cathode wire is suspended inside each anode tube. This invention eliminates the need for a rinsing device, saving significant water resources. The circulating water in the device is lossless throughout the process and does not directly contact particulate matter in the flue gas. However, it lowers the temperature of the flue gas inside the anode device, causing droplets to precipitate on the inner surface of the anode tubes, generating a uniform condensate film for dust removal.

Description

Technical Field

[0001] This invention relates to the field of environmental dust removal, specifically to a non-rinsing wet electrostatic precipitator. Background Technology

[0002] Wet electrostatic precipitators are typically installed at the outlet of desulfurization towers to further remove dust carried in the flue gas after desulfurization. Existing electrostatic precipitator technology uses a high-voltage DC discharge wire to ionize the surrounding gas. When dust particles pass through the ionized gas, they become charged and move to the collecting electrode under the influence of the electric field. The dust deposited on the electrode plate can be washed off with water using a spray or washing device. Wet scrubbers are not limited by resistivity and have high efficiency in removing inhalable dust. They can also adsorb gases, removing sulfuric acid mist and harmful substances such as heavy metals from the flue gas. However, spray cleaning requires the entire equipment to be powered off or operated with reduced voltage, which can cause the concentration of pollutants in the emitted flue gas to temporarily exceed the standard, causing some environmental pollution. Therefore, a water film distribution device capable of stabilizing dust removal needs to be designed.

[0003] A honeycomb electrostatic precipitator consists of multiple hexagonal collecting electrodes arranged in a honeycomb shape. Compared to plate dust collectors, honeycomb wet electrostatic precipitators of the same size have a larger dust collection area, stronger dust removal capacity, can be integrated with desulfurization absorption towers, have a smooth flow field, and low system resistance.

[0004] Currently, the honeycomb anode devices of mainstream wet electrostatic precipitators on the market are anode tubes that are attached to each other without gaps. They do not have the function of flue gas condensation. After the flue gas passes through the anode device, its internal temperature is high, which requires a lot of spray water for cooling and cleaning, thus increasing water consumption. Summary of the Invention

[0005] In view of the above-mentioned technical problems existing in the prior art, the purpose of the present invention is to provide a wet electrostatic precipitator that does not require rinsing.

[0006] The technical solution adopted in this invention is as follows:

[0007] A no-rinse wet electrostatic precipitator includes an electrostatic precipitator shell, a cooling water tank, and a circulating pump. The electrostatic precipitator shell houses a honeycomb-shaped, hollow anode device. The anode device comprises multiple interconnected honeycomb-shaped anode tube layers. An anode tube is disposed inside each anode tube layer, with the gap between them forming a cooling water channel. An outlet chamber plate and an inlet chamber plate are respectively disposed at the upper and lower ends of the anode device. Each cooling water channel in the anode device communicates with the internal space of the inlet and outlet chamber plates. The outlet of the outlet chamber plate is connected to the inlet of the inlet chamber plate via pipelines through the cooling water tank and the circulating pump, forming a cooling water circulation loop. A cathode wire is suspended inside each anode tube, with its upper and lower ends located above the outlet chamber plate and below the inlet chamber plate, respectively.

[0008] Furthermore, a support beam is provided at the upper end of the interior of the electrostatic precipitator housing, and the upper end of the anode device and the water outlet plate are fixedly connected to the support beam.

[0009] Furthermore, the cross-sections of the anode tube and the anode tube interlayer are both regular polygons, and several anode tube interlayers are tightly connected in a honeycomb shape. Each anode tube interlayer has a corresponding anode tube inside, and there is a space gap between them.

[0010] Furthermore, the cross-section of the anode tube and the anode tube interlayer is a regular hexagon. Wet electrostatic precipitators with triangular, quadrilateral, or other polygonal anode modules and anode plates of plate-type wet electrostatic precipitators, as well as various types of needle-punched / barbed cathode wires, can also be implemented with reference to this design.

[0011] Furthermore, the upper end of the cathode wire is connected to the upper cathode frame, and the top of the electrostatic precipitator housing is provided with several insulator chambers. Below the insulator chambers are hanging rods, and the upper cathode frame is connected to the insulator chambers through the hanging rods.

[0012] Furthermore, the end of the cathode upper frame protrudes from the side wall of the electrostatic precipitator housing and is disposed within the sealing pipe; the sealing pipe is fixedly disposed on the side wall of the electrostatic precipitator housing and connected to the insulator chamber.

[0013] Furthermore, the lower end of the cathode wire is connected to the lower cathode frame, and a cathode holder is fixedly installed on the outer side wall of the lower end of the electrostatic precipitator housing. The fixing rod inside the cathode holder passes through the electrostatic precipitator housing and is fixedly connected to the lower cathode frame. The cathode holder is located below the anode device.

[0014] Furthermore, the cathode holder below the anode device can be eliminated, and the lower end of the cathode wire is freely suspended by gravity, passing through the anode tube and located below the anode tube.

[0015] Furthermore, the reaction media such as flue gas and limestone slurry in the absorption tower are highly corrosive. Therefore, the core component of the wet electrostatic precipitator, the anode tube, is made of high-strength alloy steel with strong corrosion resistance, such as 2205, 316L, and 1.4529.

[0016] Unlike conventional wet electrostatic precipitators, the equipment of this invention does not require rinsing or spraying, thus overcoming the disadvantage of wet electrostatic precipitators being prone to corrosion and extending their service life. The absence of rinsing or spraying also avoids excessive moisture in the anode device and cathode wires, preventing short circuits and ensuring dust removal efficiency throughout the day.

[0017] The anode device of this invention comprises multiple anode tube layers arranged in a honeycomb pattern. An anode tube is disposed inside each anode tube layer, with the gap between them forming a cooling water channel. A cathode wire runs through the anode tube. Each cooling water channel communicates with the internal space of the inlet and outlet water chambers. A circulating water inlet is provided on the inlet water chamber, and a circulating water outlet is provided on the outlet water chamber. Circulating water, cooled to 0℃~45℃, is introduced into each cooling water channel within the anode device. The circulating water does not directly contact the particulate matter in the flue gas, but it lowers the flue gas temperature and saturation humidity within the anode device. Droplets precipitate on the inner surface of the anode tube, forming a uniform condensate film. This water film continuously flows along the wall of the anode tube, continuously cleaning the anode tube and maintaining stable dust removal efficiency. This technology avoids the need for power outages or voltage reductions required during traditional wet electrostatic precipitator cleaning, which can lead to short-term exceedances in gas emission concentrations. The positions of the inlet and outlet can be adjusted according to specific engineering examples.

[0018] Compared with the prior art, the technical effects achieved by the present invention are as follows:

[0019] 1) No flushing device required, saving a significant amount of water:

[0020] The circulating water in this device is lossless throughout the process and does not come into direct contact with particulate matter in the flue gas. However, it will cause the flue gas temperature in the anode device to drop out and form droplets on the inner side of the regular hexagonal anode tube, generating a uniform condensate film for cleaning.

[0021] 2) Stable dust removal throughout the entire period:

[0022] This device eliminates the need for rinsing or spraying, preventing excessive moisture from causing short circuits between the anode tube and cathode wire. The cooling circulating water in the internal jacket of the anode unit causes continuous droplet precipitation on the inner surface of the anode tube. The resulting condensate film flows continuously along the anode tube wall, continuously cleaning the anode tube and maintaining stable dust removal efficiency. This technology avoids the need for power outages or voltage reductions required during traditional wet electrostatic precipitator cleaning, which can lead to temporary exceedances in gas emission concentrations.

[0023] 3) Increased water droplet precipitation is beneficial for further improving dust removal efficiency (condensation dust removal mechanism).

[0024] This device can condense water vapor in flue gas into liquid water inside the anode unit. The water droplets flow downward along the anode tube wall under the action of gravity, collide and combine with the particulate matter in the flue gas. As the water droplets grow larger, they are eventually discharged from the bottom of the device, further improving the dust removal efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a no-rinse wet electrostatic precipitator according to the present invention;

[0026] Figure 2 This is a top view schematic diagram of the honeycomb-structured anode tube interlayer and its inner anode tube in the anode device of the present invention. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0028] Comparison Figure 1-2 :

[0029] A non-rinsing wet electrostatic precipitator includes an electrostatic precipitator housing 1, a cooling water tank 7, and a circulating pump 8. An air inlet is provided at the lower end of the electrostatic precipitator housing 1, and an air outlet is provided at the upper end.

[0030] The electrostatic precipitator housing 1 houses a honeycomb-shaped hollow anode device 2. The anode device 2 comprises multiple interconnected honeycomb-shaped anode tube interlayers 22. Each anode tube interlayer 22 contains an anode tube 21, with the gap between them forming a cooling water channel. The anode tube 21 is made of corrosion-resistant alloy steel. An outlet water chamber plate 12 and an inlet water chamber plate 9 are respectively located at the upper and lower ends of the anode device 2. A support beam 3 is located at the upper end of the electrostatic precipitator housing 1, and the upper end of the anode device 2 and the outlet water chamber plate 12 are fixedly connected to the support beam 3.

[0031] Each of the cooling water channels in the anode device 2 communicates with the internal spaces of the inlet chamber plate 9 and the outlet chamber plate 12. The outlet of the outlet chamber plate 12 is connected to the inlet of the inlet chamber plate 9 via pipelines through the cooling water tank 7 and the circulating pump 8, forming a cooling water circulation loop. Under the action of the circulating pump 8, the cooling water in the cooling water tank 7 first enters the inlet chamber plate 9, then flows into each cooling water channel in the anode device 2, then collects and flows into the outlet chamber plate 12, and finally returns to the cooling water tank 7. The cooling water tank 7 can be a low-temperature circulation tank or a combination of a regular water storage tank and a cooler.

[0032] Each anode tube 21 has a cathode wire 11 suspended inside it. The upper and lower ends of the cathode wire 11 are located above the water outlet plate 12 and below the water inlet plate 9, respectively.

[0033] Taking the connection between the anode device 2 and the outlet cavity plate 12 as an example, the outlet cavity plate 12 can be a rectangular cavity structure. The upper ends of all anode tube interlayers 22 are connected to the bottom plate of the outlet cavity plate 12, allowing the internal spaces of the anode tube interlayers 22 and the outlet cavity plate 12 to communicate. Each anode tube 21 passes through the outlet cavity plate 12, meaning the outer sidewall of the anode tube 21 is sealed and fixedly connected to the top and bottom plates of the outlet cavity plate 12, respectively. Thus, the outer sidewall of the anode tube 21 contacts the cooling water inside the outlet cavity plate 12, while the inner space of the anode tube 21 is not connected to the internal space of the outlet cavity plate 12. The upper end of the cathode wire 11 exits from the anode tube 21 and is located above the outlet cavity plate 12.

[0034] Similarly, the connection between the anode device 2 and the inlet chamber plate 9 can be set in the same way as the connection with the outlet chamber plate 12.

[0035] Comparison Figure 2 The cross-sections of the anode tube 21 and the anode tube interlayer 22 are both regular polygons. Several anode tube interlayers 22 are tightly connected in a honeycomb shape. Each anode tube interlayer 22 has a corresponding anode tube 21 inside, and there is a middle space gap between them. The space of the middle space gap is the cooling water channel for cooling water to pass through.

[0036] Furthermore, the cross-sections of both the anode tube 21 and the anode tube interlayer 22 are regular hexagons.

[0037] The lower end of the cathode wire 11 is connected to the lower cathode frame 13, and the upper end is connected to the upper cathode frame 10. The top of the electrostatic precipitator housing 1 is provided with several insulator chambers 5. A hanging rod is provided below the insulator chamber 5. The upper cathode frame 10 is connected to the insulator chamber 5 through the hanging rod.

[0038] The end of the cathode upper frame 10 protrudes from the side wall of the electrostatic precipitator housing 1 and is disposed in the sealing pipe 4; the sealing pipe 4 is fixedly disposed on the side wall of the electrostatic precipitator housing 1 and is connected to the insulator chamber 5.

[0039] A cathode holder 6 is fixedly installed on the outer side wall of the lower end of the electrostatic precipitator housing 1. The fixing rod inside the cathode holder 6 passes through the electrostatic precipitator housing 1 and is fixedly connected to the lower cathode frame 13. The cathode holder below the anode device can also be omitted, and the lower end of the cathode wire is freely suspended by gravity, passes through the anode tube, and is located below the anode tube.

[0040] The contents described in this specification are merely an enumeration of the implementation forms of the inventive concept, and the scope of protection of this invention should not be regarded as limited to the specific forms described in the embodiments.

Claims

1. A non-rinsing wet electrostatic precipitator, comprising an electrostatic precipitator housing (1), characterized in that: It also includes a cooling water tank (7) and a circulating pump (8). The electrostatic precipitator housing (1) is equipped with a honeycomb-shaped hollow anode device (2). The anode device (2) includes multiple honeycomb-shaped anode tube interlayers (22) connected in combination. Each anode tube interlayer (22) is equipped with an anode tube (21) inside, and the gap between the two forms a cooling water channel. The upper and lower ends of the anode device (2) are respectively equipped with an outlet chamber plate (12) and an inlet chamber plate (9). Each cooling water channel in the anode device (2) is connected to the internal space of the inlet chamber plate (9) and the outlet chamber plate (12). The outlet of the outlet chamber plate (12) is connected to the inlet of the inlet chamber plate (9) by the cooling water tank (7) and the circulating pump (8) in sequence through the pipeline to form a cooling water circulation loop. Each anode tube (21) is equipped with a cathode wire (11). The upper and lower ends of the cathode wire (11) are located above the outlet chamber plate (12) and below the inlet chamber plate (9), respectively.

2. The wet electrostatic precipitator without rinsing as described in claim 1, characterized in that: A support beam (3) is provided at the upper end of the casing (1) of the electrostatic precipitator. The upper end of the anode device (2) and the water outlet plate (12) are fixedly connected to the support beam (3).

3. The wet electrostatic precipitator without rinsing as described in claim 1, characterized in that: The cross-sections of the anode tube (21) and the anode tube interlayer (22) are both regular polygons. Several anode tube interlayers (22) are tightly connected in a honeycomb shape. Each anode tube interlayer (22) has a corresponding anode tube (21) inside, and there is a space gap between them.

4. The self-rinsing wet electrostatic precipitator as described in claim 3, characterized in that: The cross-sections of the anode tube (21) and the anode tube interlayer (22) are both regular hexagonal.

5. The self-rinsing wet electrostatic precipitator as described in claim 1, characterized in that: The upper end of the cathode wire (11) is connected to the cathode upper frame (10). Several insulator chambers (5) are provided on the top of the electrostatic precipitator housing (1). A hanging rod is provided below the insulator chamber (5). The cathode upper frame (10) is connected to the insulator chamber (5) through the hanging rod.

6. The self-rinsing wet electrostatic precipitator as described in claim 5, characterized in that: The end of the cathode upper frame (10) protrudes from the side wall of the electrostatic precipitator housing (1) and is disposed in the sealing pipe (4); the sealing pipe (4) is fixedly disposed on the side wall of the electrostatic precipitator housing (1) and connected to the insulator chamber (5).

7. A wet electrostatic precipitator without rinsing as described in claim 5, characterized in that: The lower end of the cathode wire (11) is connected to the cathode lower frame (13). A cathode fixer (6) is fixedly installed on the outside of the side wall at the lower end of the electrostatic precipitator housing (1). The fixing rod inside the cathode fixer (6) passes through the electrostatic precipitator housing (1) and is fixedly connected to the cathode lower frame (13).

8. The wet electrostatic precipitator without rinsing as described in claim 5, characterized in that: The lower end of the cathode wire (11) is suspended by gravity and passes through the anode tube (21) and is located below the anode tube (21).

9. A wet electrostatic precipitator without rinsing as described in claim 1, characterized in that: The anode tube (21) is made of corrosion-resistant alloy steel.

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