Flue gas treatment device

Abstract

A flue gas treatment device, comprising a flue body, multiple layers of sprayers, and multiple layers of perforated plates. A flue gas channel opened upwards is defined in the flue body; the multiple layers of sprayers are sequentially arranged in the flue gas channel in the height direction and used for spraying a spray liquid for reacting with flue gas; and the multiple layers of perforated plates correspond one-to-one to the multiple layers of sprayers, each layer of perforated plate is located above a corresponding sprayer, multiple gas passage holes allowing flue gas to pass through are formed on each perforated plate, and each sprayer is further configured to spray the spray liquid into the gas passage holes, so that the flue gas can react with the spray liquid when passing through the gas passage holes. The flue gas treatment device allows the flue gas to come into full contact with the spray liquid, improving the reaction efficiency.

Description

Flue gas treatment device Technical Field

[0001] The present invention relates to flue gas treatment technology, in particular to a flue gas treatment device. Background Art

[0002] The spraying method for treating waste gas is usually called wet waste gas treatment, which is widely used in various waste gas treatments and the separation and recovery of useful components, such as desulfurization, denitrification, decarbonization, and dust removal of flue gas.

[0003] In the prior art, wet waste gas treatment is to pass the waste gas through the absorption liquid spray dispersed in the tower, so that the waste gas and the absorption liquid spray are fully contacted in the tower and react, thereby achieving the purpose of waste gas treatment.

[0004] The inventors realized that although the spray formed by the absorption liquid is conducive to full contact with the exhaust gas and improves the reaction efficiency, there is still room for improvement in the reaction efficiency.

[0005] Summary of the Invention

[0006] An object of the present invention is to overcome at least one drawback of the prior art and to provide an integrated, skid-mounted flue gas treatment device.

[0007] A further object of the present invention is to promote further contact between the flue gas and the spray liquid, thereby improving the reaction efficiency between the flue gas and the spray liquid.

[0008] Another further object of the present invention is to utilize the drainage holes to disperse the spray liquid and prevent the flue gas from entering the drainage holes.

[0009] In particular, the present invention provides a flue gas treatment device, comprising: a flue main body, which defines an upwardly open flue gas channel; a multi-layer sprayer, arranged in sequence in the flue gas channel along the height direction, for spraying a spray liquid that reacts with the flue gas; a multi-layer air permeable plate, the multi-layer sprayers corresponding one to one, and each layer of air permeable plate is above the corresponding sprayer, and each air permeable plate is provided with a plurality of air holes for the flue gas to pass through; each sprayer is also configured to spray the spray liquid into the air hole so that the flue gas can react with the spray liquid when passing through the air hole.

[0010] Optionally, each air permeable plate is further formed with a drainage hole to drain downwards the spray liquid that drips and remains on the air permeable plate after passing through the ventilation holes.

[0011] Optionally, the flue gas treatment device also includes: a guide pipe is arranged below the air permeable plate, and the inlet end of the guide pipe is formed at the periphery of the drainage hole and extends downward; and the outlet end of the guide pipe is open in the horizontal direction; or, the outlet end of the guide pipe is open horizontally and downward.

[0012] Optionally, the outlet end of the guide tube is provided with an outwardly flipped sealing cover to seal the outlet end of the guide tube.

[0013] Optionally, the flue body includes a bottom wall and a first peripheral wall connected to the periphery of the bottom wall and extending upward to define a flue gas channel; the bottom wall is arranged to be inclined in a horizontal direction and extending downward so as to rely on gravity to guide the spray liquid dripping on the bottom wall.

[0014] Optionally, a liquid collecting trough is further provided at the inclined downstream of the bottom wall to collect the spray liquid.

[0015] Optionally, an air inlet is provided on the first peripheral wall for allowing flue gas to enter the flue gas channel.

[0016] Optionally, the flue gas treatment device also includes: an outlet body, including a second circumferential wall and a top wall, the lower end of the second circumferential wall is formed at the opening of the flue body, and extends upward and gradually, and the top wall is formed at the upper end of the second circumferential wall; an outlet for allowing flue gas to be discharged is provided on the top wall or on the surface of the second circumferential wall.

[0017] Optionally, the diameter of the air holes on each air permeable plate is between 1 mm and 10 mm; and / or the porosity of each air permeable plate is between 20% and 70%.

[0018] Optionally, the sprinkler at the bottom layer includes: a plurality of spray atomization units for atomizing the spray liquid into an atomized liquid flow; a plurality of spoiler rings corresponding one to the spray atomization units, each spoiler ring being arranged in front of the spray atomization unit and being located on the spray path of the atomized liquid flow to break up the atomized liquid flow.

[0019] The flue gas treatment device of the present invention has a ventilation plate with ventilation holes disposed above each layer of sprinklers. The spray liquid ejected upward by the sprinklers can enter the ventilation holes on the ventilation plates and form a water film within the ventilation holes. Since the flue gas needs to pass through the ventilation holes when flowing upward and possesses considerable kinetic energy, it can fully contact the water film and the spray liquid when passing through the ventilation holes, further increasing the degree of contact between the spray liquid and the flue gas and improving the reaction efficiency. In addition, a portion of the upwardly ejected spray liquid droplets impact the lower surface of the ventilation plate. When these droplets come into contact with the lower surface of the ventilation plate, they form a tiny air film on the contact surface. The flue gas within this air film reacts efficiently with the spray liquid. Furthermore, some of these droplets that come into contact with the lower surface of the ventilation plate are shattered by the impact, becoming smaller droplets, thereby improving the reaction efficiency with the flue gas.

[0020] Furthermore, in the flue gas treatment device of the present invention, a drainage hole is formed on each air permeable plate, and a guide pipe is provided below the air permeable plate. The inlet end of the guide pipe is formed at the periphery of the drainage hole and extends downward, and the outlet end of the guide pipe is open in a horizontal direction or slightly obliquely downward, and a movable cover that can be opened toward the flue gas side is provided at the outlet end, so that the flue gas flowing from bottom to top can be effectively prevented from passing through the guide pipe and the drainage hole directly through the air permeable plate without passing through the air permeable hole.

[0021] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0023] FIG1 is a front view of a flue gas treatment device according to one embodiment of the present invention;

[0024] FIG2 is a schematic structural diagram of a flue gas treatment device according to one embodiment of the present invention;

[0025] FIG3 is a schematic diagram of the coordination relationship between the guide pipe and the air permeable plate in the flue gas treatment device according to one embodiment of the present invention;

[0026] 4 is a schematic diagram of the coordination relationship between the guide pipe and the air permeable plate in a flue gas treatment device according to another embodiment of the present invention;

[0027] FIG5 is a schematic diagram showing the principle of the lowest-level sprinkler of a flue gas treatment device according to one embodiment of the present invention. DETAILED DESCRIPTION

[0028] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," "coupled," and the like should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise expressly limited. A person of ordinary skill in the art should be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0030] Unless otherwise defined, all terms (including technical terms and scientific terms) used in the description of the present disclosure have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0031] In the description of this disclosure, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0032] The structure and working principle of the present invention will be described below with reference to Figures 1 to 5. Figure 1 is a front view of a flue gas treatment device according to one embodiment of the present invention. Figure 2 is a schematic structural diagram of a flue gas treatment device according to one embodiment of the present invention. Figure 3 is a schematic diagram illustrating the coordination between the guide pipe 400 and the air permeable plate 300 in the flue gas treatment device according to one embodiment of the present invention. Figure 4 is a schematic diagram illustrating the coordination between the guide pipe 400 and the air permeable plate 300 in another embodiment of the present invention. Figure 5 is a schematic diagram illustrating the principle of the sprayer 200 at the bottom layer of the flue gas treatment device according to one embodiment of the present invention.

[0033] The present invention provides a flue gas treatment device, which can be arranged at the tail of a fossil fuel combustion device to achieve purification treatment of the flue gas.

[0034] Furthermore, the flue gas treatment device uses wet waste gas treatment to purify the flue gas. Wet waste gas treatment is to pass the waste gas through the absorption liquid spray dispersed in the tower, so that the waste gas and the absorption liquid spray are fully contacted and reacted in the tower, thereby achieving the purpose of waste gas treatment.

[0035] For example, the flue gas treatment device can perform desulfurization on the flue gas, i.e., wet desulfurization. In this case, the absorption liquid can be limestone slurry, which chemically reacts with sulfide to achieve desulfurization.

[0036] For another example, the flue gas treatment device can perform carbon capture on the flue gas. In this case, the absorption liquid can be an alcohol amine solution (such as ethanolamine), which chemically reacts with carbon dioxide in the flue gas to achieve carbon capture.

[0037] For another example, the flue gas treatment device can also perform denitrification on the flue gas. In this case, the absorption liquid can be a urea solution, which chemically reacts with nitrogen oxides in the flue gas to achieve denitrification.

[0038] The above examples are intended to facilitate understanding of the working principles of the flue gas treatment device of the present invention, and are not intended to limit the functions of the flue gas treatment device. Those skilled in the art may also utilize the flue gas treatment device to perform other treatments on the flue gas based on the principle of wet waste gas treatment, which are not listed here one by one.

[0039] It should also be noted that when wet waste gas treatment is used, the reaction can be either a chemical reaction or a physical reaction. For example, when the flue gas treatment device is used for dust removal, the absorption liquid can be water. The sprayed water forms fine droplets, which collide with dust particles in the flue gas, causing the dust particles to adhere to the droplet surface, thereby achieving dust removal.

[0040] In some embodiments, the flue gas treatment device may include a flue main body 100, multi-layer sprayers 200, and multi-layer air permeable plates 300. The flue main body 100 defines an upwardly open flue gas channel. The multi-layer sprayers 200 are arranged sequentially along the height direction within the flue gas channel and are configured to spray a spray liquid that reacts with the flue gas. The multi-layer air permeable plates 300 correspond one-to-one with the multi-layer sprayers 200, with each air permeable plate 300 positioned above a corresponding sprayer 200. Each air permeable plate 300 is provided with a plurality of air holes 310 for the flue gas to pass through. Each sprayer 200 is further configured to spray a spray liquid into the air holes 310 so that the flue gas can react with the spray liquid as it passes through the air holes 310.

[0041] In this embodiment, a flue gas channel is formed inside the flue main body 100 , and the flue gas channel is open upward, that is, the flue gas can be discharged from the flue gas channel from bottom to top.

[0042] Multiple layers of sprayers 200 are arranged in sequence in the flue gas channel along the height direction. Multiple spray units 210 can be set on each layer of sprayers 200. Each spray unit 210 can atomize and pressurize the spray liquid to form a spray to improve the reaction efficiency between the spray liquid and the flue gas.

[0043] Each layer of the air permeable plate 300 can be arranged horizontally and spaced above the corresponding sprinkler 200. The air holes 310 can pass through the air permeable plate 300 from top to bottom, and the flue gas can pass through the multiple air holes 310 on each layer of the air permeable plate 300 from bottom to top.

[0044] In this embodiment, since a breathable plate 300 is provided above each layer of sprinklers 200 and breathable holes 310 are provided on the breathable plate 300, the spray liquid ejected upward by the sprinkler 200 can enter the breathable holes 310 on the breathable plate 300 and form a water film in the breathable holes 310.

[0045] Since the flue gas needs to pass through the air holes 310 when flowing upward and has a large kinetic energy, it can penetrate the water film when passing through the air holes 310 and fully contact with the spray liquid, further improving the contact degree between the spray liquid and the flue gas and improving the reaction efficiency.

[0046] Furthermore, some of the upwardly ejected spray droplets impact the lower surface of the air permeable plate 300. These droplets form a microscopic air film on the contact surface, creating a highly efficient reaction between the flue gas and the spray liquid within this air film. Furthermore, some of these droplets that contact the lower surface of the air permeable plate 300 are shattered by the impact, breaking into smaller droplets and thus improving the reaction efficiency with the flue gas.

[0047] In addition, not all of the spray liquid sprayed upward by the sprayer 200 may enter the air holes 310. The spray liquid that does not enter the air holes 310 is blocked by the lower surface of the air permeable plate 300 and flows downward under the action of gravity, forming a countercurrent with the flue gas and can also react with the flue gas.

[0048] In some embodiments, each air permeable plate 300 is further formed with a drainage hole 320 to drain downward the spray liquid dripping onto the air permeable plate 300 and remaining on the air permeable plate 300 after passing through the air permeable holes 310 .

[0049] Because the flue main body 100 has multiple layers of sprinklers 200 and multiple layers of air permeable panels 300, the spray liquid sprayed by the sprinklers 200 on the upper layer eventually drips down onto the air permeable panels 300 on the lower layer. Furthermore, for sprinklers 200 and air permeable panels 300 on the same layer, the spray liquid sprayed by the sprinklers 200 toward the air holes 310 may also directly pass through the air holes 310 and drip onto the air permeable panels 300 on the same layer. Therefore, some spray liquid accumulates on each layer of air permeable panels 300.

[0050] The drainage holes 320 of each air-permeable plate 300 can effectively guide the accumulated spray liquid downward and collect it so that it can be recycled.

[0051] Furthermore, a guide pipe 400 is provided below the air permeable plate 300 , and an inlet end of the guide pipe 400 is formed at the periphery of the drainage hole 320 and extends downward.

[0052] Furthermore, the outlet end of the guide pipe 400 is open horizontally, or the outlet end of the guide pipe 400 is open horizontally and downwardly, which can effectively prevent the flue gas flowing from bottom to top from passing through the guide pipe 400 and the drainage hole 320 directly through the air permeable plate 300 without passing through the air permeable hole 310.

[0053] Furthermore, the inlet end of the guide tube 400 can be integrally formed with the breathable plate 300 to improve the sealing performance of the interface. In addition, the shape of the guide tube 400 itself can be set according to actual conditions, for example, it can be set as a curved tube as shown in Figure 3, or it can also be set as a straight tube as shown in Figure 4.

[0054] Furthermore, a sealing cover 410 that can be turned outward is provided at the outlet end of the guide tube 400 to seal the outlet end of the guide tube 400 .

[0055] The sealing cover 410 may be pivotally connected to the outlet end of the guide pipe 400 via a rotating connection piece to prevent flue gas from entering the guide pipe 400 .

[0056] When enough spray liquid accumulates in guide tube 400, it pushes open sealing cap 410, allowing the spray liquid to flow out. After some of the spray liquid has flowed out, the remaining spray liquid's gravity cannot overcome the weight of sealing cap 410, and sealing cap 410 returns to its closed position. The remaining spray liquid now acts as a liquid seal on sealing cap 410, further preventing flue gas from entering.

[0057] In some embodiments, the flue body 100 may further include a bottom wall 110 and a first peripheral wall 120 connected to the periphery of the bottom wall 110 and extending upward to define a flue gas channel. The bottom wall 110 is arranged in an inclined state extending downwardly in a horizontal direction so that the spray liquid dripping on the bottom wall 110 can be discharged by gravity.

[0058] In this embodiment, the spray liquid on each layer of the air permeable plate 300 flows downward layer by layer and eventually drips onto the bottom wall 110 of the flue main body 100. Since the bottom wall 110 of the flue main body 100 is arranged in a horizontal and downwardly extending inclined state, the spray liquid on the bottom wall 110 flows downwardly, thereby facilitating the collection of the spray liquid.

[0059] Furthermore, a liquid collecting tank 112 is provided at the downstream of the bottom wall 110 of the flue body 100 to collect the spray liquid. The collected spray liquid can be processed and redistributed to the sprayers 200 at each layer under the action of the spray pump for recycling.

[0060] It should be noted that the inclination of the bottom wall 110 of the flue body 100 can be set according to actual conditions. It can be tilted to one side as a whole, or both sides can be tilted to the middle, both of which can achieve the purpose of collecting the spray liquid.

[0061] Furthermore, the first peripheral wall 120 is provided with an air inlet 122 for allowing flue gas to enter the flue gas channel. Specifically, the flue gas inlet 122 is located on the side of the flue main body 100. Flue gas enters the flue gas channel laterally and then exits the flue gas channel from bottom to top. The placement of the air inlet 122 on the side of the flue main body 100 facilitates connection to external equipment and maintenance.

[0062] In some embodiments, the flue gas treatment device may further include an outlet body 500, which includes a second peripheral wall 510 and a top wall 520. The lower end of the second peripheral wall 510 is formed at the open end of the flue body 100 and extends upward and gradually. The top wall 520 is formed at the upper end of the second peripheral wall 510. The top wall 520 is provided with an outlet 522 for allowing flue gas to be discharged.

[0063] That is, the flue main body 100 and the outlet main body 500 together constitute the main body of the flue gas treatment device. The flue main body 100 and the outlet main body 500 can be integrally formed, which reduces the installation process and improves the mechanical strength of the flue gas treatment device main body.

[0064] Since the second peripheral wall 510 extends upward and gradually, and the gas outlet 522 is provided on the top wall 520, when the flue gas is discharged from the flue gas channel, the flow cross section of the flue gas gradually shrinks, which can increase the flow rate of the flue gas and make the flue gas more unobstructed.

[0065] In some embodiments, the air outlet 522 may also be provided on the second peripheral wall 510 . The second peripheral wall 510 has a tapered shape, which can also serve to increase the flue gas flow rate.

[0066] In some embodiments, the shape of the air holes 310 on each air permeable plate 300 can be set to be circular or semicircular, and the hole diameter is between 1 mm and 10 mm, such as 1 mm, 3 mm, 5 mm, 8 mm, 10 mm, etc.

[0067] In some embodiments, the porosity of each gas permeable plate 300 is between 20% and 70%, for example, 20%, 30%, 40%, 50%, 70%, etc.

[0068] In some embodiments, the sprayer 200 at the bottom layer may also include multiple spray atomization units 220 and multiple spoiler rings 230. The multiple spray atomization units 220 are used to atomize the spray liquid into an atomized liquid flow. The multiple spoiler rings 230 correspond one-to-one to the spray atomization units 220. Each spoiler ring 230 is arranged in front of the spray atomization unit 220 and is located on the spray path of the atomized liquid flow to break up the atomized liquid flow.

[0069] "Front" refers to the front of the spray atomization unit's spray direction. The spoiler 230 is located in the spray path of the atomized liquid flow. When the atomized liquid flow contacts the spoiler 230, the spoiler 230 increases the agitation of the atomized fluid, making the atomized fluid mix more evenly. This results in a finer atomized liquid flow that can react with the flue gas for a longer period of time.

[0070] In addition, the atomization effect of the sprinkler 200 at the bottom layer is better than that of the sprinkler 200 at the upper layer. The larger droplets sprayed by the sprinkler 200 at the upper layer can collide with the fine droplets sprayed by the sprinkler 200 at the bottom layer, demisting the fine droplets and preventing them from mixing and flowing out with the flue gas.

[0071] At this point, those skilled in the art will recognize that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A flue gas treatment device, comprising: a flue main body defining a flue gas passage open upward; a multi-layer sprayer, sequentially arranged in the flue gas channel along the height direction, for spraying a spray liquid that reacts with the flue gas; Multiple layers of air permeable plates, corresponding one to one with the multiple layers of the sprinklers, and each layer of the air permeable plates is located above the corresponding sprinkler, and each of the air permeable plates is provided with multiple air holes for flue gas to pass through; Each of the sprayers is further configured to spray the spray liquid into the air holes so that the flue gas can react with the spray liquid when passing through the air holes.

2. The flue gas treatment device according to claim 1, wherein: Each of the air-permeable plates is further formed with a drainage hole to drain downward the spray liquid that drips onto the air-permeable plate and remains on the air-permeable plate after passing through the air-permeable holes.

3. The flue gas treatment device according to claim 2, further comprising: A guide tube is provided below the air permeable plate, and an inlet end of the guide tube is formed at the periphery of the drainage hole and extends downward; and, The outlet end of the guide pipe is opened in a horizontal direction; or, the outlet end of the guide pipe is opened in a horizontal direction and downward.

4. The flue gas treatment device according to claim 3, wherein: The outlet end of the guide tube is provided with an outwardly turned sealing cover to seal the outlet end of the guide tube.

5. The flue gas treatment device according to any one of claims 1 to 4, wherein: The flue main body includes a bottom wall and a first peripheral wall connected to the periphery of the bottom wall and extending upward to define the flue gas channel; The bottom wall is arranged in an inclined state extending downward in a horizontal direction so as to guide the spray liquid dripping on the bottom wall by gravity.

6. The flue gas treatment device according to claim 5, wherein: A liquid collecting trough is also provided at the inclined downstream of the bottom wall to collect the spray liquid.

7. The flue gas treatment device according to claim 5, wherein: The first peripheral wall is provided with an air inlet for allowing flue gas to enter the flue gas channel.

8. The flue gas treatment device according to any one of claims 1 to 4, further comprising: The outlet body includes a second peripheral wall and a top wall, wherein the lower end of the second peripheral wall is formed at the open end of the flue body and extends upward and gradually, and the top wall is formed at the upper end of the second peripheral wall; An air outlet for allowing flue gas to be discharged is provided on the top wall or the second peripheral wall.

9. The flue gas treatment device according to any one of claims 1 to 4, wherein: On each of the air-permeable plates, the diameter of the air holes is between 1 mm and 10 mm; and / or, The porosity of each of the air-permeable panels is between 20% and 70%.

10. The flue gas treatment device according to any one of claims 1 to 4, wherein: The sprayer at the bottom layer includes: Multiple spray atomization units, used to atomize the spray liquid into an atomized liquid flow; A plurality of spoiler rings correspond one to one with the spray atomization units. Each spoiler ring is arranged in front of the spray atomization unit and is located on the spray path of the atomized liquid flow to break up the atomized liquid flow.

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