Flue gas purification device for power plant boiler

Abstract

The flue gas purification device comprises a flue gas conveying pipe, a purification box and a water injection assembly, and the first end of the flue gas conveying pipe is connected with a smoke outlet of the boiler; the purification box is provided with a purification cavity and a powder injection opening used for injecting lime powder, the powder injection opening communicates with the purification cavity, and the second end of the flue gas conveying pipe extends to the bottom of the purification cavity; the water injection assembly comprises a water injection pipe and a spray head which is arranged in the purification cavity and connected with the water injection pipe. According to the flue gas purification device for the boiler of the power plant disclosed by the embodiment of the invention, the lime water can be used for fully filtering flue gas discharged by the boiler and removing dust, CO, CO2, SO2, nitric oxide and the like in the flue gas, so that air pollution caused by direct discharge of the flue gas is prevented, and meanwhile, the probability of blockage of the flue gas discharge pipe can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas purification equipment, and in particular to a flue gas purification device for a boiler in a power plant. Background Art

[0002] The power plant boiler is one of the main thermal equipment in a thermal power plant. It is usually used in conjunction with a steam turbine generator set. It is mainly used for power generation and can also be used for external heat supply in some special scenarios. When the power plant boiler is in operation, fuel combustion will produce flue gas, which usually contains compounds such as CO, CO2, SO2, nitrogen oxides, as well as dust, water vapor, etc. The direct emission of these flue gases will cause air pollution. At the same time, dust and water vapor will adhere to the wall of the exhaust pipe, causing the exhaust pipe to be blocked. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention proposes a flue gas purification device for a power plant boiler. Lime water can fully filter the flue gas discharged from the boiler, remove dust, CO, CO2, SO2 and nitrogen oxides in the flue gas, thereby preventing air pollution caused by direct flue gas emissions and reducing the probability of blockage of the exhaust pipe.

[0005] The flue gas purification device for a power plant boiler according to an embodiment of the present invention comprises a flue gas conveying pipe, a purification box and a water injection assembly, wherein the first end of the flue gas conveying pipe is connected to the smoke exhaust port of the boiler; the purification box has a purification chamber and a powder injection port for injecting lime powder, the powder injection port is connected to the purification chamber, and the second end of the flue gas conveying pipe extends to the bottom of the purification chamber; the water injection assembly comprises a water injection pipe and a nozzle, the nozzle is arranged in the purification chamber, and the nozzle is connected to the water injection pipe.

[0006] In some embodiments, the water injection assembly further includes an annular pipe, the water injection pipe is connected to the annular pipe, and there are multiple nozzles, which are evenly distributed along the circumference of the annular pipe and connected to the annular pipe.

[0007] In some embodiments, one end of the water injection pipe is penetrated through the top wall of the purification chamber, and the other end is penetrated through the bottom wall of the purification chamber, and is rotatable relative to the purification box.

[0008] In some embodiments, the flue gas purification device for a power plant boiler further includes a driving assembly for driving the water injection pipe to rotate, and the driving assembly is connected to the purification box.

[0009] In some embodiments, the flue gas purification device for a power plant boiler further includes a plurality of stirring blades, each of which is connected to the outer wall of the water injection pipe, and the stirring blades are disposed at the lower side of the nozzle.

[0010] In some embodiments, the flue gas conveying pipe includes a first pipe section and a second pipe section that are perpendicular and connected to each other, the first pipe section is connected to the smoke exhaust port of the boiler, a part of the second pipe section is arranged outside the purification chamber, and the other part is arranged inside the purification chamber; the flue gas purification device for a power plant boiler also includes a first cleaning component for cleaning the inner wall of the first pipe section and a second cleaning component for cleaning the inner wall of the second pipe section.

[0011] In some embodiments, the first cleaning assembly includes a first rotating rod and a plurality of first scrapers, the first rotating rod is disposed in the first pipe section and rotatably connected to the first pipe section, the first scraper stops at the inner wall of the first pipe section, and the plurality of first scrapers are all connected to the first rotating rod; and / or the second cleaning assembly includes a second rotating rod and a plurality of second scrapers, the second rotating rod is disposed in the second pipe section and rotatably connected to the second pipe section, the second scraper stops at the inner wall of the second pipe section, and the plurality of second scrapers are all connected to the second rotating rod.

[0012] In some embodiments, the first rotating rod and the water injection pipe are perpendicular to each other, and a first transmission assembly is provided between the first rotating rod and the water injection pipe so that the first rotating rod and the water injection pipe rotate synchronously; and / or the second rotating rod is parallel to the water injection pipe, and a second transmission assembly is provided between the second rotating rod and the water injection pipe so that the second rotating rod and the water injection pipe rotate synchronously.

[0013] In some embodiments, the purification box further has an installation cavity, the installation cavity is arranged at the lower side of the purification cavity, the installation cavity and the purification cavity are not connected to each other, and the second transmission assembly is arranged in the installation cavity.

[0014] In some embodiments, a flushing pipe is provided on the first pipe section, and a valve body is provided on the flushing pipe to control the on-off of the flushing pipe through the valve body.

[0015] The flue gas purification device for a power plant boiler according to an embodiment of the present invention injects lime powder into a purification chamber through a powder injection port, and injects water into the purification chamber through a water injection pipe and a nozzle, and the lime powder is mixed with water to form lime water; the flue gas conveying pipe can convey the flue gas discharged from the power plant boiler to the bottom of the purification chamber, so that the flue gas discharged from the boiler is fully contacted with the lime water before being discharged, and the lime water can fully filter the flue gas discharged from the boiler, remove dust, CO, CO2, SO2 and nitrogen oxides in the flue gas, thereby preventing air pollution caused by direct flue gas emission, and at the same time can reduce the probability of blockage of the smoke exhaust pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of a flue gas purification device for a power plant boiler according to an embodiment of the present invention.

[0017] Figure 2 The diagram is a schematic diagram of the internal structure of a purification box of a flue gas purification device for a power plant boiler according to an embodiment of the present invention.

[0018] Figure 3 The diagram is a schematic diagram of the internal structure of a flue gas conveying pipe of a flue gas purification device for a power plant boiler according to an embodiment of the present invention.

[0019] Figure 4 yes Figure 1 A magnified schematic diagram of center A.

[0020] Reference numerals:

[0021] 100. Flue gas purification device;

[0022] 1. Smoke conveying pipe; 11. First pipe section; 12. Second pipe section;

[0023] 2. Purification box; 21. Purification chamber; 22. Installation chamber;

[0024] 3. Water injection assembly; 31. Water injection pipe; 311. Water supply pipe; 32. Sprinkler; 33. Ring pipe;

[0025] 4. Base;

[0026] 5. driving assembly; 51. motor; 52. third bevel gear;

[0027] 6. Stirring blade;

[0028] 71, first cleaning assembly; 711, first rotating rod; 712, first scraper; 72, second cleaning assembly; 721, second rotating rod; 722, second scraper;

[0029] 81, first transmission assembly; 811, first bevel gear; 812, second bevel gear; 82, second transmission assembly; 821, sprocket; 822, chain;

[0030] 9. Flushing pipe; 91. Valve body;

[0031] 200. Boiler; 201. Smoke exhaust port. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0033] like Figure 1 and Figure 2 As shown, the flue gas purification device 100 for a power plant boiler in an embodiment of the present invention includes a flue gas conveying pipe 1, a purification box 2 and a water injection assembly 3. The first end of the flue gas conveying pipe 1 is connected to the smoke exhaust port 201 of the boiler 200; the purification box 2 has a purification chamber 21 and a powder injection port (not shown in the figure) for injecting lime powder, the powder injection port is connected to the purification chamber 21, and the second end of the flue gas conveying pipe 1 extends to the bottom of the purification chamber 21; the water injection assembly 3 includes a water injection pipe 31 and a nozzle 32, the nozzle 32 is arranged in the purification chamber 21, and the nozzle 32 is connected to the water injection pipe 31.

[0034] The flue gas purification device 100 for a power plant boiler according to an embodiment of the present invention injects lime powder into the purification chamber 21 through a powder injection port, and injects water into the purification chamber 21 through a water injection pipe 31 and a nozzle 32. The lime powder and water are mixed to form lime water. The flue gas conveying pipe 1 can convey the flue gas discharged from the power plant boiler 200 to the bottom of the purification chamber 21, so that the flue gas discharged from the boiler 200 is fully contacted with the lime water before being discharged. The lime water can fully filter the flue gas discharged from the boiler 200, remove dust, CO, CO2, SO2 and nitrogen oxides in the flue gas, thereby preventing air pollution caused by direct flue gas emission, and at the same time reducing the probability of blockage of the smoke exhaust pipe.

[0035] It can be understood that the upper side of the purification box 2 has an exhaust port, and the smoke filtered by the lime water is discharged from the exhaust port.

[0036] like Figure 1 As shown, the flue gas purification device 100 is arranged on one side of the boiler 200, and a base 4 is provided on the lower side of the boiler 200, and the flue gas purification device 100 is also installed on the base 4; the upper side of the boiler 200 has a smoke exhaust port 201, and the first end of the smoke conveying pipe 1 is connected to the smoke exhaust port 201 of the boiler 200, and the other end passes through the top box wall of the purification box 2 and extends into the purification chamber 21. The smoke generated by the combustion of the boiler 200 is conveyed to the bottom of the purification chamber 21 through the smoke conveying pipe 1.

[0037] In some embodiments, Figure 2 As shown, the water injection assembly 3 also includes an annular pipe 33 , the water injection pipe 31 is connected to the annular pipe 33 , and there are multiple nozzles 32 , which are evenly distributed along the circumference of the annular pipe 33 and connected to the annular pipe 33 .

[0038] The plurality of nozzles 32 are evenly distributed along the circumference of the annular tube 33 . When water is injected into the purification chamber 21 through the plurality of nozzles 32 , the distribution range of the water flow is larger, which is more conducive to the mixing of the lime powder and the water.

[0039] Alternatively, if Figure 1 As shown, the spraying direction of the spray head 32 is inclined outward from top to bottom.

[0040] In some embodiments, one end of the water injection pipe 31 is penetrated through the top wall of the purification chamber 21 , and the other end is penetrated through the bottom wall of the purification chamber 21 , and is rotatable relative to the purification box 2 .

[0041] The water injection pipe 31 can drive multiple nozzles 32 to rotate simultaneously. The nozzles 32 spray water during the rotation process, making the water flow distribution more uniform. At the same time, the water flow sprayed by the multiple nozzles 32 can form a vortex during the rotation process, which is more conducive to the mixing of water flow and lime powder.

[0042] In addition, when the lime water's ability to purify flue gas reaches saturation, the lime water needs to be discharged. Afterwards, the water flow sprayed by multiple nozzles 32 can clean the cavity wall of the purification chamber 21. Multiple nozzles 32 spray multiple water flows during rotation, and the cleaning of the cavity wall of the purification chamber 21 is more uniform and thorough.

[0043] As an example, Figure 2 As shown, the water injection pipe 31 extends vertically, passes through the top box wall of the purification box 2 and is connected by a bearing, and the lower end passes through the bottom wall of the purification chamber 21 and is connected by a bearing to ensure the smooth rotation of the water injection pipe 31; the upper end of the water injection pipe 31 is connected to the water supply pipe 311 through a rotating joint, the water injection pipe 31 can rotate relative to the water supply pipe 311, and water supply to the water injection pipe 31 can be achieved at the same time.

[0044] The annular tube 33 is arranged close to the top wall of the purification chamber 21 , and is connected to the water injection pipe 31 . Multiple nozzles 32 are arranged on the lower side of the annular tube 33 . The water injection pipe 31 is used to transport water to the annular tube 33 , and then spray it into the purification chamber 21 through the multiple nozzles 32 .

[0045] A water baffle is provided on the water injection pipe 31, and the water baffle is arranged at the lower side of the annular pipe 33 and close to the annular pipe 33. The water baffle can block the water injection pipe 31 and prevent the water in the water injection pipe 31 from flowing downward; in other words, the water in the water injection pipe 31 only fills its upper half, and the water can be transported to the annular pipe 33.

[0046] Of course, in other embodiments, the water baffle may also be disposed at the lower end of the water injection pipe 31 , so that the water can fill the entire water injection pipe 31 .

[0047] In some embodiments, Figure 1 As shown, the flue gas purification device 100 for a power plant boiler further includes a driving assembly 5 for driving the water injection pipe 31 to rotate, and the driving assembly 5 is connected to the purification box 2.

[0048] The driving assembly 5 can provide power for the rotation of the water injection pipe 31, so that the water injection pipe 31 rotates automatically, and the operation is more convenient.

[0049] In some embodiments, Figure 2 As shown, the flue gas purification device 100 for a power plant boiler further includes a plurality of stirring blades 6 , which are all connected to the outer wall of the water injection pipe 31 , and the stirring blades 6 are arranged at the lower side of the nozzle 32 .

[0050] By providing the stirring blade 6, the stirring blade 6 can rotate along with the water injection pipe 31, so that the water flow and the lime powder are fully mixed.

[0051] Optionally, the stirring blade 6 is a stirring rod.

[0052] As an example, Figure 2 As shown, the stirring rod is in the shape of an elongated strip and extends radially along the water injection pipe 31, and the stirring rod is fixedly connected to the outer wall of the water injection pipe 31; at least two stirring rods form a group, and there are multiple groups of stirring rods in total, and the multiple groups of stirring rods are evenly distributed along the axial direction of the water injection pipe 31. Multiple stirring rods rotate simultaneously to fully mix the lime powder and water, thereby improving the filtering effect on the flue gas discharged from the boiler 200.

[0053] Of course, in other embodiments, the stirring blade 6 may also be configured in other shapes, such as a rectangular blade shape, an arc-shaped blade shape, etc.

[0054] In some embodiments, Figure 1 and Figure 2 As shown, the flue gas conveying pipe 1 includes a first pipe section 11 and a second pipe section 12 which are perpendicular and connected to each other, the first pipe section 11 is connected to the smoke exhaust port 201 of the boiler 200, a part of the second pipe section 12 is arranged outside the purification chamber 21, and the other part is arranged inside the purification chamber 21; the flue gas purification device 100 for a power plant boiler also includes a first cleaning component 71 for cleaning the inner wall of the first pipe section 11 and a second cleaning component 72 for cleaning the inner wall of the second pipe section 12.

[0055] It is known that the flue gas conveying pipe 1 is used to convey the flue gas generated by the combustion of the boiler 200 to the purification chamber 21. Impurities in the unpurified flue gas will adhere to the inner wall of the flue gas conveying pipe 1, causing the flue gas conveying pipe 1 to be easily blocked.

[0056] The first cleaning component 71 and the second cleaning component 72 can clean the inner wall of the smoke conveying pipe 1 and remove impurities attached to the inner wall of the smoke conveying pipe 1, thereby reducing the probability of blockage of the smoke conveying pipe 1 and ensuring the normal use of the smoke conveying pipe 1.

[0057] As an example, the first pipe segment 11 extends horizontally, the second pipe segment 12 extends vertically and is parallel to the water injection pipe 31, the second pipe segment 12 is arranged on the side of the water injection pipe 31 close to the boiler 200, and has a gap with the end of the stirring blade 6 to prevent the stirring blade 6 from colliding with the second pipe segment 12 during rotation.

[0058] In some embodiments, Figure 3 As shown, the first cleaning component 71 includes a first rotating rod 711 and a plurality of first scrapers 712, the first rotating rod 711 is arranged in the first pipe section 11 and is rotatably connected to the first pipe section 11, the first scraper 712 stops at the inner wall of the first pipe section 11, and the plurality of first scrapers 712 are all connected to the first rotating rod 711; and / or the second cleaning component 72 includes a second rotating rod 721 and a plurality of second scrapers 722, the second rotating rod 721 is arranged in the second pipe section 12 and is rotatably connected to the second pipe section 12, the second scraper 722 stops at the inner wall of the second pipe section 12, and the plurality of second scrapers 722 are all connected to the second rotating rod 721.

[0059] Through the above arrangement, multiple first scrapers 712 rotate with the first rotating rod 711 to clean the inner wall of the first pipe segment 11 and remove impurities attached to the inner wall of the first pipe segment 11. Multiple second scrapers 722 rotate with the second rotating rod 721 to clean the inner wall of the second pipe segment 12 and remove impurities attached to the second pipe segment 12, thereby reducing the probability of blockage of the smoke conveying pipe 1.

[0060] As an example, Figure 3 As shown, the first rotating rod 711 extends along the length direction of the first pipe segment 11 and matches the length of the first pipe segment 11. At least two first scrapers 712 form a group. Multiple first scrapers 712 in the same group are evenly distributed along the circumference of the first rotating rod 711. Multiple groups of first scrapers 712 are evenly distributed along the axial direction of the first rotating rod 711, which can perform a more comprehensive and thorough cleaning of the inner wall of the first pipe segment 11.

[0061] The second rotating rod 721 extends along the length direction of the second pipe section 12 and matches the length of the second pipe section 12. At least two second scrapers 722 form a group. The multiple second scrapers 722 in the same group are evenly distributed along the circumference of the second rotating rod 721. The multiple groups of second scrapers 722 are evenly distributed along the axial direction of the second rotating rod 721, so as to clean the inner wall of the second pipe section 12 more comprehensively and thoroughly.

[0062] In some embodiments, Figure 1 As shown, the first rotating rod 711 and the water injection pipe 31 are perpendicular to each other, and a first transmission assembly 81 is provided between the first rotating rod 711 and the water injection pipe 31 so that the first rotating rod 711 and the water injection pipe 31 rotate synchronously; and / or the second rotating rod 721 is parallel to the water injection pipe 31, and a second transmission assembly 82 is provided between the second rotating rod 721 and the water injection pipe 31 so that the second rotating rod 721 and the water injection pipe 31 rotate synchronously.

[0063] The water injection pipe 31 rotates under the drive of the driving component 5, and the first rotating rod 711 can be driven to rotate through the first transmission component 81, and the second rotating rod 721 can be driven to rotate through the second transmission component 82. Therefore, only one power source of the driving component 5 is required to realize the rotation of the nozzle 32, the stirring blade 6, the first rotating rod 711 and the second rotating rod 721, so as to realize the stirring of the lime water and the cleaning of the flue gas conveying pipe 1, which is more convenient to control and saves more energy.

[0064] Alternatively, if Figure 4 As shown, the first transmission assembly 81 includes a first bevel gear 811 and a second bevel gear 812 meshing with each other. The first bevel gear 811 is sleeved on the first rotating rod 711 and rotates synchronously therewith, and the second bevel gear 812 is sleeved on the water injection pipe 31 and rotates synchronously therewith.

[0065] As an example, Figure 1 and Figure 4 As shown, the first rotating rod 711 passes through the pipe wall of the smoke conveying pipe 1 and extends to the water injection pipe 31. The first rotating rod 711 is rotatably connected to the pipe wall of the smoke conveying pipe 1 through a bearing, which can improve the stability of the rotation of the first rotating rod 711. The driving assembly 5 includes a motor 51 and a third bevel gear 52. The motor 51 is arranged on the upper side of the purification box 2 and connected to the top wall of the purification box 2. The third bevel gear 52 is meshed with the second bevel gear 812; thus, the motor 51 drives the third bevel gear 52 to rotate, and drives the water injection pipe 31 to rotate through the second bevel gear 812. At the same time, since the second bevel gear 812 is meshed with the first bevel gear 811, the first rotating rod 711 can be driven to rotate, thereby realizing the cleaning of the inner wall of the first pipe section 11.

[0066] Alternatively, if Figure 2 As shown, the second transmission assembly 82 includes a chain 822 and two sprockets 821 . The two sprockets 821 are respectively mounted on the second rotating rod 721 and the water injection pipe 31 , and the chain 822 is wound around the two sprockets 821 .

[0067] Therefore, when the sprocket 821 mounted on the water injection pipe 31 rotates, the chain 822 can drive the sprocket 821 mounted on the second rotating rod 721 to rotate, thereby driving the second rotating rod 721 to rotate, thereby cleaning the inner wall of the second pipe section 12.

[0068] In some embodiments, Figure 2 As shown, the purification box 2 further has an installation cavity 22 , which is disposed at the lower side of the purification cavity 21 . The installation cavity 22 and the purification cavity 21 are not connected to each other, and the second transmission assembly 82 is disposed in the installation cavity 22 .

[0069] The second transmission assembly 82 is arranged in the installation cavity 22 , so that the second transmission assembly 82 can be separated from the lime water in the purification cavity 21 , thereby protecting the second transmission assembly 82 and preventing the lime water from damaging the second transmission assembly 82 .

[0070] As an example, Figure 2 As shown, there is a gap between the lower end of the second pipe section 12 and the bottom wall of the purification chamber 21, so that the smoke can be discharged smoothly; the second rotating rod 721 is inserted upward from the lower end of the second pipe section 12 into the interior of the second pipe section 12, and the second rotating rod 721 passes through the bottom wall of the purification chamber 21 (which is also the top wall of the installation chamber 22) and is rotatably connected thereto through a bearing; the lower end of the water injection pipe 31 passes through the bottom wall of the purification chamber 21 and is rotatably connected thereto through a bearing, and the two sprockets 821 are respectively mounted on the water injection pipe 31 and the second rotating rod 721, and the rotation of the water injection pipe 31 can drive the second rotating rod 721 to rotate, thereby cleaning the inner wall of the second pipe section 12.

[0071] In some embodiments, Figure 1 As shown, a flushing pipe 9 is provided on the first pipe section 11 , and a valve body 91 is provided on the flushing pipe 9 to control the on / off of the flushing pipe 9 through the valve body 91 .

[0072] The flushing pipe 9 is adjusted to a connected state through the valve body 91, and water can be injected into the first pipe section 11. The water flows through the first pipe section 11 and the second pipe section 12 in sequence and then flows into the purification chamber 21 from the lower end of the second pipe section 12. Impurities cleaned from the inner wall of the flue gas conveying pipe 1 can be flushed away, thereby improving the cleaning effect of the flue gas conveying pipe 1.

[0073] Optionally, when the lime water's purification capacity for flue gas reaches saturation, before the lime water in the purification chamber 21 is discharged, the valve body 91 can be opened to adjust the flushing pipe 9 to a connected state, and water can be injected into the flue gas conveying pipe 1 through the flushing pipe 9 for flushing.

[0074] Thus, the impurities removed from the flue gas conveying pipe 1 are flushed into the purification chamber 21 and discharged to the outside along with the lime water.

[0075] Optionally, the valve body 91 is a solenoid valve.

[0076] In this way, the on and off of the flushing tube 9 can be remotely controlled, and the operation is more convenient.

[0077] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0079] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0081] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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 schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0082] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A flue gas purification device (100) for a power plant boiler, characterized in that: include: A smoke conveying pipe (1), a first end of the smoke conveying pipe (1) being connected to a smoke exhaust port (201) of the boiler (200); A purification box (2), the purification box (2) having a purification chamber (21) and a powder injection port for injecting lime powder, the powder injection port being in communication with the purification chamber (21), and the second end of the smoke conveying pipe (1) extending to the bottom of the purification chamber (21); A water injection assembly (3), the water injection assembly (3) comprising a water injection pipe (31) and a nozzle (32), the nozzle (32) being arranged in the purification chamber (21), and the nozzle (32) being connected to the water injection pipe (31).

2. The flue gas purification device (100) for a power plant boiler according to claim 1, characterized in that: The water injection assembly (3) further comprises an annular tube (33), the water injection tube (31) being connected to the annular tube (33), and the number of the nozzles (32) being multiple, the multiple nozzles (32) being evenly distributed along the circumference of the annular tube (33) and being connected to the annular tube (33).

3. The flue gas purification device (100) for a power plant boiler according to claim 2, characterized in that: One end of the water injection pipe (31) is inserted through the top wall of the purification chamber (21), and the other end is inserted through the bottom wall of the purification chamber (21), and is rotatable relative to the purification box (2).

4. The flue gas purification device (100) for a power plant boiler according to claim 3, characterized in that: It also comprises a driving assembly (5) for driving the water injection pipe (31) to rotate, and the driving assembly (5) is connected to the purification box (2).

5. The flue gas purification device (100) for a power plant boiler according to claim 3, characterized in that: It also includes a plurality of stirring blades (6), each of which is connected to the outer wall of the water injection pipe (31), and the stirring blades (6) are arranged on the lower side of the spray head (32).

6. The flue gas purification device (100) for a power plant boiler according to claim 4, characterized in that: The smoke conveying pipe (1) comprises a first pipe section (11) and a second pipe section (12) which are perpendicular and connected to each other, the first pipe section (11) being connected to a smoke exhaust port (201) of the boiler (200), a part of the second pipe section (12) being arranged outside the purification chamber (21), and the other part being arranged inside the purification chamber (21); The flue gas purification device (100) for a power plant boiler further comprises a first cleaning component (71) for cleaning the inner wall of the first pipe section (11) and a second cleaning component (72) for cleaning the inner wall of the second pipe section (12).

7. The flue gas purification device (100) for a power plant boiler according to claim 6, characterized in that: The first cleaning assembly (71) comprises a first rotating rod (711) and a plurality of first scrapers (712); the first rotating rod (711) is disposed in the first pipe section (11) and is rotatably connected to the first pipe section (11); the first scraper (712) abuts against an inner wall of the first pipe section (11); and the plurality of first scrapers (712) are all connected to the first rotating rod (711); and / or The second cleaning assembly (72) comprises a second rotating rod (721) and a plurality of second scrapers (722); the second rotating rod (721) is arranged in the second pipe section (12) and is rotatably connected to the second pipe section (12); the second scraper (722) abuts against the inner wall of the second pipe section (12); and the plurality of second scrapers (722) are all connected to the second rotating rod (721).

8. The flue gas purification device (100) for a power plant boiler according to claim 7, characterized in that: The first rotating rod (711) and the water injection pipe (31) are perpendicular to each other, and a first transmission assembly (81) is provided between the first rotating rod (711) and the water injection pipe (31), so that the first rotating rod (711) and the water injection pipe (31) rotate synchronously; and / or The second rotating rod (721) is parallel to the water injection pipe (31), and a second transmission assembly (82) is provided between the second rotating rod (721) and the water injection pipe (31), so that the second rotating rod (721) and the water injection pipe (31) rotate synchronously.

9. The flue gas purification device (100) for a power plant boiler according to claim 8, characterized in that: The purification box (2) further comprises an installation cavity (22), wherein the installation cavity (22) is arranged at the lower side of the purification cavity (21), the installation cavity (22) and the purification cavity (21) are not connected to each other, and the second transmission assembly (82) is arranged in the installation cavity (22).

10. The flue gas purification device (100) for a power plant boiler according to any one of claims 6 to 9, characterized in that: A flushing pipe (9) is provided on the first pipe section (11), and a valve body (91) is provided on the flushing pipe (9) so as to control the on and off of the flushing pipe (9) through the valve body (91).

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