CN211051225U - Flue gas purifying device - Google Patents

Abstract

The utility model discloses a flue gas purification device, which comprises a prewashing tower, an adsorption tower and a plasma generator, wherein a spray pipe is arranged inside the prewashing tower, the spray pipe extends along the axis direction of the prewashing tower, at least two sprayers are arranged on the spray pipe and are distributed at intervals along the axis direction of the spray pipe, a first air inlet and a first air outlet are respectively arranged at the bottom and the top of the prewashing tower, a circulating pump is arranged outside the prewashing tower, a liquid inlet of the circulating pump is connected with the bottom of the prewashing tower, a liquid outlet of the circulating pump is connected with the upper end of the spray pipe, spray liquid is contained at the bottom of the prewashing tower, a plasma processing unit and a plasma power supply are arranged in the plasma generator, a second air inlet and a second air outlet are respectively arranged at the bottom and the top of the adsorption tower, the first air outlet and the second air inlet are respectively communicated with the inside of the plasma generator, the inside of the adsorption tower is provided with an activated carbon adsorbent. The structure is simple, and the service life is long.

Description

Flue gas purifying device

Technical Field

The utility model relates to a flue gas treatment field especially relates to a flue gas purification device.

Background

In the exhaust gas generated by incineration of refuse, gases accompanied by various components such as a sulfur-containing gas, a chlorine-containing gas, and a dioxin-containing gas, generally, the sulfur-containing gas and the chlorine-containing gas are respectively SO₂Gas and hydrogen chloride gas. When cleaning such flue gas, the SO₂Both the gas and the hydrogen chloride gas have acidity, which can seriously corrode the flue gas purification equipment, thereby causing the shortening of the service life of the flue gas purification equipment. In addition, the structure of the existing flue gas purification equipment is complex and is not beneficial to production.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: provides a flue gas purification device which has simple structure and long service life.

In order to achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a flue gas purification device, including prewashing tower, adsorption tower and plasma generator, the inside of prewashing tower is provided with the shower, the shower extends along the axis direction of prewashing tower, be provided with two at least sprayers on the shower, two at least the sprayers along the axis direction interval distribution of shower, first air inlet and first gas outlet have been seted up respectively to the bottom and the top of prewashing tower, the outside of prewashing tower is provided with the circulating pump, the inlet of circulating pump with the bottom of prewashing tower is connected, the liquid outlet of circulating pump with the upper end of shower is connected, the bottom splendid attire of prewashing tower has spray liquid, install plasma processing unit and plasma power in the plasma generator, the bottom and the top of adsorption tower are provided with second air inlet and second gas outlet respectively, the first air outlet and the second air inlet are communicated with the inside of the plasma generator respectively, an activated carbon adsorption body is arranged inside the adsorption tower, and the activated carbon adsorption body is located between the second air inlet and the second air outlet.

As a preferable technical scheme of the flue gas purification device, the spray liquid is a sodium hydroxide solution.

As a flue gas purification device's an preferred technical scheme, still include the washing liquid holding vessel, the inside splendid attire of washing liquid holding vessel has the washing liquid, first gas outlet with plasma generator passes through venturi scrubber intercommunication, venturi scrubber includes contraction section, choke and diffuser, the contraction section with first gas outlet is connected, the diffuser with plasma generator connects, the choke is located the contraction section with between the diffuser, the washing liquid holding vessel has first liquid outlet and first inlet, first liquid outlet with first inlet respectively with the choke is connected.

As a preferable technical solution of the flue gas purification device, an axis of the spray pipe coincides with an axis of the prewashing tower.

As a preferable technical scheme of the flue gas purification device, the flue gas purification device further comprises a driving motor for driving the spray pipe to rotate around the axis of the prewashing tower, and the driving motor is connected with the lower end of the spray pipe.

As a preferable technical scheme of the flue gas purification device, a liquid outlet of the circulating pump is connected with a spraying pipe through a second liquid conveying pipe, the spraying pipe can rotate relative to the second liquid conveying pipe, and a bearing is arranged between the spraying pipe and the second liquid conveying pipe.

As an optimal technical scheme of the flue gas purification device, the flue gas purification device further comprises a liquid adding pump and a liquid storage tank used for storing the spraying liquid, wherein the liquid adding pump is respectively connected with the liquid storage tank and the prewashing tower, a liquid discharge pipe is arranged at the bottom of the prewashing tower, and a control valve is arranged on the liquid discharge pipe.

As a preferable technical scheme of the flue gas purification device, the activated carbon adsorbent is arranged at an interval with the bottom of the adsorption tower.

As a preferred technical scheme of the flue gas purification device, the adsorption tower is provided with a tower body and an end cover, the upper end of the tower body is open, the second gas inlet and the second gas outlet are respectively arranged on the tower body, the activated carbon adsorbent is arranged inside the tower body, and the end cover is selectively connected with the open end of the tower body.

As a preferable technical solution of the flue gas purification apparatus, a demister is connected between the plasma generator and the adsorption tower.

The utility model has the advantages that: in the flue gas purifying apparatus of the present invention, the gas is first pre-washed inside the pre-washing tower before entering the plasma generator to remove most of the dust and SO in the flue gas₂The gas and the hydrogen chloride gas are removed, SO in the gas can be avoided₂The gas and the hydrogen chloride gas corrode the plasma generator and prevent dust from being adhered to the inside of the plasma generator, damage to the plasma generator is reduced, and the service life of the plasma generator is prolonged.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Fig. 1 is a schematic structural diagram of a flue gas purification device according to an embodiment.

In the figure:

1. pre-washing the tower; 2. a plasma generator; 3. a tower body; 4. a venturi scrubber; 401. a contraction section; 402. a throat; 403. a diffuser section; 5. a first air inlet; 6. a demister; 7. a drive motor; 8. a control valve; 9. a circulation pump; 10. a first infusion tube; 11. a shower pipe; 12. a sprayer; 13. a first air outlet; 14. a liquid storage tank; 15. a plasma power supply; 16. a washing liquid storage tank; 17. a communicating pipe; 18. a second air outlet; 19. an activated carbon adsorbent; 20. a liquid adding pump; 21. a second infusion tube; 22. and (4) end covers.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

As shown in figure 1, the utility model provides a, including prewashing tower 1, adsorption tower and being located prewashing tower 1 with plasma generator 2 between the adsorption tower. The inside of prewashing tower 1 is provided with shower 11, shower 11 is along the axis direction of prewashing tower 1 extends, be provided with two at least sprayers 12 on the shower 11, two at least sprayers 12 are along the axis direction interval distribution of shower 11. First air inlet 5 and first gas outlet 13 have been seted up respectively to the bottom and the top of prewashing tower 1, the outside of prewashing tower 1 is provided with circulating pump 9, the inlet of circulating pump 9 with the bottom of prewashing tower 1 is connected, the liquid outlet of circulating pump 9 with the upper end of shower 11 is connected. The bottom of the prewashing tower 1 is filled with spraying liquid. The plasma generator 2 has a wire barrel type plasma processing unit and a plasma power supply 15 therein. The plasma treatment unit is a metal tube made of stainless steel, the metal tube is connected with the plasma power supply 15, and the flue gas enters the bobbin type plasma reaction unit and undergoes an oxidation-reduction reaction in the metal tube. The bottom and the top of adsorption tower are provided with second air inlet and second gas outlet 18 respectively, first gas outlet 13 with the second air inlet respectively with plasma generator 2's inside intercommunication, the inside of adsorption tower is provided with activated carbon adsorption 19, activated carbon adsorption 19 is located the second air inlet with between the second gas outlet 18. Specifically, the spraying liquid can be mixed with SO₂And an alkaline solution such as a sodium hydroxide solution or ammonia water, etc., in which hydrogen chloride gas reacts with sodium hydroxide. In this embodiment, the spray solution is a sodium hydroxide solution.

The flue gas to be purified enters the inside of the prewashing tower 1 from the first air inlet 5, the spraying liquid at the bottom of the prewashing tower 1 is pumped into the top of the spraying pipe 11 through the circulating pump 9 and then is arranged at the top of the spraying pipe 11The spray 12 on the spray pipe 11 sprays out. The spray liquid sprayed by the sprayer 12 can spray the flue gas in the prewashing tower 1, and most of dust in the flue gas is absorbed by the sodium hydroxide solution and most of SO in the flue gas during spraying₂And hydrogen chloride gas and sodium hydroxide solution, and then the flue gas is introduced into the interior of the plasma generator 2 through the first gas outlet 13 and the second gas inlet. Wherein, the inner wall of the plasma processing unit is provided with nanometer Ba_0.8Sr_0.2Zr_0.1Ti_0.9O₃The filler generates a large amount of active particles such as high-energy electrons, hydroxyl radicals, ozone, and the like in the plasma treatment unit. Dioxin molecules in the flue gas are subjected to a series of physical and chemical reactions such as ionization, cracking and oxidation in the plasma treatment unit and are cracked to generate fragment groups or other non-toxic or low-toxicity small molecular substances, and the activated carbon adsorbent 19 in the adsorption tower can adsorb the non-toxic or low-toxicity small molecular substances in the flue gas, so that the gas is purified. In the flue gas purifying apparatus of the present invention, the flue gas is first pre-washed in the pre-washing tower 1 before entering the plasma generator 2 to remove most of dust and SO in the flue gas₂The gas and the hydrogen chloride gas are removed, SO in the gas can be avoided₂The gas and the hydrogen chloride gas corrode the plasma generator 2 and prevent dust from adhering to the inside of the plasma generator 2, so that damage to the plasma generator 2 is reduced, and the service life of the plasma generator 2 is prolonged.

In this embodiment, first air inlet 5 is located prewashing tower 1 bottom the top of prewashing liquid, through this design, can prevent that the phenomenon of suck-back from taking place for the solution of prewashing tower 1 inside and prevent that first air inlet from leading to the unable smooth phenomenon of entering into prewashing tower 1 inside of flue gas to take place owing to the liquid seal.

In an embodiment, the flue gas purification device further includes a washing liquid storage tank 16, the washing liquid is held in the washing liquid storage tank 16, first gas outlet 13 with the plasma generator 2 communicates through venturi scrubber 4, venturi scrubber 4 includes contraction section 401, throat 402 and diffusion section 403, contraction section 401 with first gas outlet 13 is connected, diffusion section 403 with plasma generator 2 is connected, throat 402 is located contraction section 401 with between the diffusion section 403, washing liquid storage tank 16 has first liquid outlet and first inlet, first liquid outlet with first inlet respectively with throat 402 is connected. Specifically, the washing liquid contained in the washing liquid storage tank 16 is a sodium hydroxide solution.

The venturi scrubber 4 with such a structure, after the pre-washing treatment, enters the contraction section 401, diffuses in the throat 402 and performs gas-liquid convection with the washing liquid to form dust-containing liquid droplets, and the diffusion section 403 captures the dust-containing liquid droplets, so as to further remove particle impurities in the flue gas and improve the efficiency of flue gas purification.

Specifically, the first liquid outlet and the first liquid inlet are respectively connected to the throat 402 through a first infusion tube 10.

In this embodiment, the axis of the spray pipe 11 coincides with the axis of the prewashing tower 1, and this design enables the spray pipe 11 to be located at the middle position of the prewashing tower 1, so as to ensure that the spray liquid sprayed by the spray 12 is fully contacted with the flue gas in the prewashing tower 1, and reduce the spray blind area of the spray 12 in the prewashing tower 1.

As a preferable technical scheme, the flue gas purification device further comprises a driving motor 7 for driving the spray pipe 11 to rotate around the axis of the prewashing tower 1, and the driving motor 7 is connected with the lower end of the spray pipe 11. In this embodiment, drive shower 11 through driving motor 7 and rotate, because on shower 12 sets up shower 11, can drive all shower 12 synchronous rotations when shower 11 rotates, this design can carry out 360 rotations around prewashing tower 1 with shower 12 in prewashing tower 1, realize that shower 12 sprays the flue gas of prewashing tower 1 inside all directions, on the basis of the efficiency of spraying of assurance shower 12, can reduce the quantity that sets up of shower 12 as far as possible.

In order to avoid the corrosion of the driving motor 7 by the spraying liquid inside the prewashing tower 1, in a specific implementation, the driving motor 7 can be arranged outside the prewashing tower 1, and the driving shaft of the driving motor 7 penetrates through the bottom of the prewashing tower 1 to be connected with the spraying pipe 11 inside.

Further, a liquid outlet of the circulation pump 9 is connected to the shower pipe 11 through a second liquid transport pipe 21, and the shower pipe 11 is rotatably provided with respect to the second liquid transport pipe 21. Wherein, a bearing is arranged between the spray pipe 11 and the second delivery pipe, and the friction between the spray pipe 11 and the second infusion pipe 21 is reduced by the bearing

In this embodiment, five sprayers 12 are arranged on the spray pipe 11, and in a specific design, the number of the sprayers 12 on the spray pipe 11 can be flexibly set as required.

In another embodiment, the flue gas purification device further comprises a liquid adding pump 20 and a liquid storage tank 14 for storing the spray liquid, the liquid adding pump 20 is respectively connected with the liquid storage tank 14 and the prewashing tower 1, a liquid discharge pipe is arranged at the bottom of the prewashing tower 1, and a control valve 8 is arranged on the liquid discharge pipe. Wherein, the liquid storage tank 14 is filled with a spray liquid, and the spray liquid in the liquid storage tank 14 can be pumped into the prewashing tower 1 by the liquid adding pump 20. The arrangement of the drain pipe can extract the spray liquid and the sediment in the prewashing tower 1 to the outside of the prewashing tower 1. Wherein, the setting of control valve 8 is convenient to the discharge of spraying liquid.

In this embodiment, the activated carbon adsorption body 19 and the bottom of the adsorption tower are arranged at an interval, so that a space is formed between the bottom of the adsorption tower and the activated carbon adsorption body 19, and the space can be used for buffering part of the flue gas flowing out of the plasma generator 2, thereby preventing the flue gas from being accumulated in the plasma generator 2 in a large amount and influencing the flue gas treated by the plasma processor.

In this embodiment, the adsorption tower has tower body 3 and end cover 22, the upper end opening of tower body 3, the second air inlet with second gas outlet 18 sets up respectively on the tower body 3, activated carbon adsorbent 19 sets up the inside of tower body 3, end cover 22 with the open end selective connection of tower body 3, through the open end selective connection with end cover 22 and tower body 3, when specific use, can open end cover 22 from tower body 3, conveniently change the inside activated carbon adsorbent of tower body 3.

Specifically, the end cover 22 is connected with the tower body 3 through a sealing ring, and the sealing ring is arranged to prevent the flue gas inside the tower body 3 from leaking from a gap between the end cover 22 and the tower body 3.

In particular, the end cover 22 and the tower body 3 may be connected by a flange assembly.

In one embodiment, the adsorption tower is connected to the plasma generator 2 through a connection pipe 17.

In another embodiment, a demister 6 is connected between the plasma generator 2 and the adsorption tower, and the demister 6 can be used to absorb water mist in the flue gas, dry the flue gas before the flue gas enters the adsorption tower, reduce water vapor entering the adsorption tower, and improve the adsorption capacity of the activated carbon adsorbent 19 on small molecular substances in the flue gas which are non-toxic or have low toxicity.

As a preferred technical scheme, tower body 3 is the drum structure, the inner wall ring of tower body 3 is equipped with interior connecting thread, activated carbon adsorption 19 is cylindric structure, activated carbon adsorption 19's external diameter with the internal diameter of tower body 3 matches, activated carbon adsorption 19's periphery ring be equipped with interior connecting thread screws the complex external connection screw thread, this kind of design, can screw activated carbon adsorption 19 in tower body 3, need not fix activated carbon adsorption 19 at the inside other fixed part that sets up of tower body 3, conveniently changes the activated carbon.

Specifically, the activated carbon adsorbent 19 includes a plurality of activated carbon adsorption layers, and the activated carbon adsorption layers are stacked along the axial direction of the tower body 3.

In the description herein, it is to be understood that the terms "upper," "lower," "left," "right," and the like are used in an orientation or positional relationship based on what is shown in the drawings for convenience of description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims (10)

1. A flue gas purification device is characterized by comprising a prewashing tower, an adsorption tower and a plasma generator, wherein a spray pipe is arranged inside the prewashing tower and extends along the axis direction of the prewashing tower, at least two sprayers are arranged on the spray pipe and distributed along the axis direction of the spray pipe at intervals, a first air inlet and a first air outlet are respectively formed in the bottom and the top of the prewashing tower, a circulating pump is arranged outside the prewashing tower, a liquid inlet of the circulating pump is connected with the bottom of the prewashing tower, a liquid outlet of the circulating pump is connected with the upper end of the spray pipe, spray liquid is contained in the bottom of the prewashing tower, a plasma processing unit and a plasma power supply are installed in the plasma generator, and a second air inlet and a second air outlet are respectively formed in the bottom and the top of the adsorption tower, the first air outlet and the second air inlet are communicated with the inside of the plasma generator respectively, an activated carbon adsorption body is arranged inside the adsorption tower, and the activated carbon adsorption body is located between the second air inlet and the second air outlet.

2. The flue gas purification device according to claim 1, wherein the spray liquid is a sodium hydroxide solution.

3. The flue gas purification device according to claim 1, further comprising a cleaning solution storage tank, wherein the cleaning solution storage tank contains a cleaning solution, the first gas outlet is communicated with the plasma generator through a venturi scrubber, the venturi scrubber comprises a contraction section, a throat and a diffusion section, the contraction section is connected with the first gas outlet, the diffusion section is connected with the plasma generator, the throat is located between the contraction section and the diffusion section, the cleaning solution storage tank has a first liquid outlet and a first liquid inlet, and the first liquid outlet and the first liquid inlet are respectively connected with the throat.

4. The flue gas purification device according to claim 1, wherein the axis of the shower pipe coincides with the axis of the prewash tower.

5. The flue gas purification device according to claim 4, further comprising a driving motor for driving the spray pipe to rotate around the axis of the prewashing tower, wherein the driving motor is connected with the lower end of the spray pipe.

6. The flue gas purification device according to claim 5, wherein the liquid outlet of the circulating pump is connected with a shower pipe through a second liquid conveying pipe, the shower pipe can rotate relative to the second liquid conveying pipe, and a bearing is arranged between the shower pipe and the second liquid conveying pipe.

7. The flue gas purification device according to claim 1, further comprising a liquid adding pump and a liquid storage tank for storing the spray liquid, wherein the liquid adding pump is respectively connected with the liquid storage tank and the prewashing tower, a liquid discharge pipe is arranged at the bottom of the prewashing tower, and a control valve is arranged on the liquid discharge pipe.

8. The flue gas purification device according to claim 1, wherein the activated carbon adsorbent is spaced from the bottom of the adsorption tower.

9. The flue gas purification device according to claim 8, wherein the adsorption tower has a tower body and an end cover, the upper end of the tower body is open, the second gas inlet and the second gas outlet are respectively disposed on the tower body, the activated carbon adsorbent is disposed inside the tower body, and the end cover is selectively connected to the open end of the tower body.

10. The flue gas purification apparatus according to any one of claims 1 to 9, wherein a demister is connected between the plasma generator and the adsorption tower.

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