High-efficiency dioxin removal device for waste incineration tail gas

Abstract

The utility model discloses a kind of dioxin high-efficiency removal devices in waste incineration tail gas, including adsorption filler column (1), the lower part of adsorption filler column (1) side is equipped with inlet (2), adsorption filler column (1) top is equipped with smoke outlet (3), bag type dust removal component (4) is connected with smoke outlet (3), inlet (3) is connected with venturi (5);The venturi (5) includes contraction section (51), throat (52) and diffusion section (53), throat (52) is equipped with multiple annular distribution's activated carbon powder injection port (54);The adsorption filler column (1) is equipped with multiple layers of activated carbon filler layer (11) distributed upwards and downwards, inverted conical air distribution cover (12) is equipped between adjacent activated carbon filler layer (11), inverted conical air distribution cover (12) inner surface is equipped with helical spoiler (13) and air distribution hole (14).The utility model has the characteristics that dioxin adsorption effect can be effectively improved.

Description

Technical Field

[0001] This utility model relates to a waste incineration power generation equipment exhaust gas treatment device, and in particular a high-efficiency dioxin remover for waste incineration exhaust gas. Background Technology

[0002] Waste incineration is an important means of achieving waste reduction, harmlessness, and resource recovery. However, the exhaust gas it produces contains highly toxic dioxins, posing a serious threat to human health and the ecological environment. Currently, the most mainstream and mature dioxin purification technology for waste incineration flue gas both domestically and internationally is a combined process of "activated carbon adsorption + bag filter." This mainly includes an activated carbon adsorption tower and a bag filter. Dioxins are adsorbed by activated carbon in the activated carbon adsorption tower, and then further filtered by the bag filter. However, existing activated carbon adsorption towers mainly consist of multiple layers of packing material filled with activated carbon. The flue gas and activated carbon do not mix evenly during the short residence time, resulting in insufficient contact and some dioxins escaping without being effectively adsorbed, leading to poor overall adsorption efficiency. Therefore, existing technologies suffer from poor adsorption performance. Summary of the Invention

[0003] The purpose of this invention is to provide a high-efficiency dioxin remover for waste incineration flue gas. This invention is characterized by its ability to effectively improve dioxin adsorption.

[0004] The technical solution of this utility model: a high-efficiency dioxin remover for waste incineration flue gas, comprising an adsorption packed tower, an inlet at the lower part of one side of the adsorption packed tower, an exhaust outlet at the top of the adsorption packed tower, a bag filter assembly connected to the exhaust outlet, and a venturi tube connected to the inlet; the venturi tube includes a contraction section, a throat, and a diffusion section, and the throat is provided with multiple annularly distributed activated carbon powder injection nozzles; the adsorption packed tower is provided with multiple layers of activated carbon packing distributed vertically, and an inverted conical air distribution hood is provided between adjacent activated carbon packing layers, with spiral baffles and air distribution holes on the inner surface of the inverted conical air distribution hood.

[0005] In the aforementioned high-efficiency dioxin remover for waste incineration flue gas, the contraction angle of the contraction section is 20-30°, and the diffusion angle of the diffusion section is 5-7°.

[0006] In the aforementioned high-efficiency dioxin remover for waste incineration flue gas, a connecting flange is provided at the outer end of the flue gas outlet, and a connector is provided at the end of the bag filter assembly; the connecting flange has a set of fan-shaped insertion slots arranged in a ring, and magnets are embedded in the inner wall of the fan-shaped insertion slots; the connector has a magnetic fan-shaped block on its end face.

[0007] In the aforementioned high-efficiency dioxin remover for waste incineration flue gas, the top and bottom of the connecting flange are provided with a first pin hole, the side of the first pin hole is provided with an elastic pin, the connecting head is provided with an annular cover that cooperates with the connecting flange, and the annular cover is provided with a second pin hole that cooperates with the elastic pin.

[0008] Compared with existing technologies, this invention improves dioxin adsorption by installing a Venturi tube at the flue gas inlet of the adsorption tower and multiple annularly distributed activated carbon powder injection nozzles at the throat of the Venturi tube, creating a high-speed turbulent zone at the throat. This instantly atomizes and accelerates the injected powdered activated carbon, allowing for initial intense mixing and adsorption with the flue gas. Simultaneously, this invention incorporates multiple layers of activated carbon packing within the adsorption tower, with inverted conical air distribution hoods within adjacent layers. The inner surface of these hoods features spiral baffles and air distribution holes, which enhance flue gas distribution uniformity and create disturbance, increasing turbulence and significantly extending the contact time and area between the gas and solid phases, thus improving adsorption efficiency. In summary, this invention effectively improves dioxin adsorption. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a structural view of an inverted cone-shaped wind distribution shroud.

[0010] The labels in the attached diagram are as follows: 1-Adsorption packed tower, 2-Flue gas inlet, 3-Flue gas outlet, 4-Bag filter assembly, 5-Venturi tube, 6-Connecting flange, 7-Connector, 8-Fan-shaped insertion slot, 9-Magnetic fan-shaped block, 51-Contraction section, 52-Throat, 53-Diffuser section, 54-Activated carbon powder injection nozzle, 11-Activated carbon packing layer, 12-Inverted conical air distribution hood, 13-Spiral baffle, 14-Air distribution hole, 15-First pin hole, 16-Elastic pin, 17-Annular cover, 18-Second pin hole. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0012] Example. A high-efficiency dioxin removal device for waste incineration flue gas, configured as follows: Figure 1-2As shown, the system includes an adsorption packed tower 1, with a smoke inlet 2 at the lower part of one side and a smoke exhaust outlet 3 at the top. The smoke exhaust outlet 3 is connected to a bag filter assembly 4, and the smoke inlet 3 is connected to a Venturi tube 5. The Venturi tube 5 includes a contraction section 51, a throat 52, and a diffusion section 53. The throat 52 is provided with multiple annularly distributed activated carbon powder injection nozzles 54. The adsorption packed tower 1 contains multiple layers of activated carbon packing 11 distributed vertically. An inverted conical air distribution hood 12 is provided between adjacent activated carbon packing layers 11. The inner surface of the inverted conical air distribution hood 12 is provided with spiral baffles 13 and air distribution holes 14.

[0013] The contraction angle of the contraction section 51 is 20-30°, and the diffusion angle of the diffusion section 53 is 5-7°.

[0014] The outer end of the exhaust port 3 is provided with a connecting flange 6, and the end of the bag dust collector 4 is provided with a connector 7; the connecting end face of the connecting flange 6 is provided with a set of fan-shaped insertion slots 8 distributed in a ring, the inner wall of the fan-shaped insertion slots 8 is embedded with magnets, and the end face of the connector 7 is provided with a magnetic fan-shaped block 9.

[0015] The connecting flange 6 is also provided with a first pin hole 15 at the top and bottom, and an elastic pin 16 is provided on the side of the first pin hole 15. The connector 7 is provided with an annular cover 17 that cooperates with the connecting flange 6, and the annular cover 17 is provided with a second pin hole 18 that cooperates with the elastic pin 16.

[0016] The resilient pin mainly consists of a spring and a pin, with a handle at the end of the pin.

[0017] The end face of the connecting flange 6 is also provided with multiple annular sealing rings, and the connector head is provided with an annular sealing groove that mates with the annular sealing rings.

[0018] The activated carbon powder injection port is connected to an activated carbon powder injection assembly via a pipeline.

[0019] The contraction angle is set to 20°-30° to prevent vortex losses caused by airflow separation.

[0020] The throat length-to-diameter ratio is set to 1:1 to 2:1 to ensure sufficient mixing length without excessively increasing drag.

[0021] The diffusion angle is set to 5°-7° to prevent the airflow from detaching from the pipe wall.

[0022] This application employs a three-stage synergistic purification mechanism of "Venturi tube initial mixing + packed tower turbulent enhanced adsorption + bag filter deep capture," which greatly improves the contact probability and adsorption efficiency between activated carbon and dioxins (especially gaseous dioxins) in flue gas.

[0023] The adsorption process described in this application is as follows: Dioxin-containing flue gas from a waste incinerator enters a venturi tube through the inlet. At the throat of the venturi tube, a measured amount of powdered activated carbon is injected into the high-speed flue gas through an activated carbon injection port. Under the influence of the Venturi effect, the activated carbon is fully atomized and dispersed, and undergoes its first efficient mixing and adsorption with the flue gas.

[0024] Subsequently, the gas-solid mixture enters the adsorption packed tower. As the mixture passes through the inert packing layer inside the tower, the flow path is continuously altered and divided, creating intense turbulence. This process greatly enhances the collision and contact between activated carbon and flue gas, especially with gaseous dioxin molecules, making the adsorption reaction more complete and thorough.

[0025] Finally, the fully adsorbed flue gas enters the bag filter assembly for filtration. The filtered activated carbon particles and the original fly ash are trapped by the filter bags and adhere to the surface of the filter bags. The purified clean gas is then discharged.

[0026] When the filter bag of the bag filter assembly needs to be replaced, simply pull out the elastic pin and then remove the bag filter assembly for replacement. During installation, first pull out the elastic pin and keep it in a compressed state. Then, insert the magnetic sector block on the connector of the bag filter assembly into the sector insertion groove (connected magnetically). The sealing rings form multiple seals, and the first and second pin holes correspond. Loosen the elastic pin and connect and fix the connector and connecting flange.

Claims

1. A high-efficiency dioxin removal device for waste incineration flue gas, characterized in that: The adsorption packing tower (1) includes a smoke inlet (2) at the bottom of one side of the adsorption packing tower (1) and a smoke exhaust outlet (3) at the top of the adsorption packing tower (1). The smoke exhaust outlet (3) is connected to a bag filter assembly (4), and the smoke inlet (2) is connected to a venturi tube (5). The venturi tube (5) includes a contraction section (51), a throat (52) and a diffusion section (53). The throat (52) is provided with multiple annularly distributed activated carbon powder injection ports (54). The adsorption packing tower (1) is provided with multiple layers of activated carbon packing (11) distributed vertically. An inverted conical wind equalization hood (12) is provided between adjacent activated carbon packing layers (11). The inner surface of the inverted conical wind equalization hood (12) is provided with spiral baffles (13) and wind equalization holes (14).

2. The high-efficiency dioxin removal device for waste incineration flue gas according to claim 1, characterized in that: The contraction angle of the contraction section (51) is 20-30°, and the diffusion angle of the diffusion section (53) is 5-7°.

3. The high-efficiency dioxin removal device for waste incineration flue gas according to claim 1, characterized in that: The exhaust port (3) is provided with a connecting flange (6) at its outer end, and the bag filter assembly (4) is provided with a connector (7) at its end. The connecting flange (6) has a set of fan-shaped insertion slots (8) arranged in a ring on its connecting end face. The inner wall of the fan-shaped insertion slots (8) is embedded with magnets, and the end face of the connector (7) is provided with magnetic fan-shaped blocks (9).

4. The high-efficiency dioxin removal device for waste incineration flue gas according to claim 3, characterized in that: The connecting flange (6) is provided with a first pin hole (15) at the top and bottom, and an elastic pin (16) is provided on the side of the first pin hole (15). The connector (7) is provided with an annular cover (17) that cooperates with the connecting flange (6), and the annular cover (17) is provided with a second pin hole (18) that cooperates with the elastic pin (16).

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