Flue gas purification device for power plant boiler

Abstract

A flue gas purification device (100) for a power plant boiler. The device comprises a flue gas delivery pipe (1), a purification tank (2) and a water injection assembly (3), wherein a first end of the flue gas delivery pipe (1) is connected to a flue gas discharge port (201) of a boiler (200); the purification tank (2) has a purification cavity (21) and a powder injection port for injecting lime powder therethrough, the powder injection port being in communication with the purification cavity (21); a second end of the flue gas delivery pipe (1) extends to the bottom of the purification cavity (21); and the water injection assembly (3) comprises a water injection pipe (31) and a spray head (32), the spray head (32) being disposed in the purification cavity (21) and being connected to the water injection pipe (31). In the flue gas purification device (100) for a power plant boiler, lime water can fully filter flue gas discharged from the boiler (200) so as to remove ash, CO, CO2, SO2, nitrogen oxides, etc. from the flue gas, thereby preventing air pollution caused by direct discharge of the flue gas, and also reducing the probability of a flue gas discharge pipe becoming blocked.

Description

Flue gas purification device for power plant boilers Technical Field

[0001] This invention relates to the technical field of flue gas purification equipment, and specifically to a flue gas purification device for power plant boilers. Background Technology

[0002] Power plant boilers are one of the main thermal power equipment in thermal power plants, usually used in conjunction with steam turbine generator sets. Their primary function is power generation, but they can also be used for external heating in certain special scenarios. During operation, the combustion of fuel in power plant boilers produces flue gas, which typically contains compounds such as CO, CO2, SO2, and nitrogen oxides, as well as dust and water vapor. Direct emission of this flue gas causes air pollution. Simultaneously, dust and water vapor adhere to the walls of the exhaust pipes, causing blockages. Summary of the Invention

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

[0004] Therefore, embodiments of the present invention propose a flue gas purification device for power plant boilers. Lime water can fully filter the flue gas discharged from the boiler, removing dust, CO, CO2, SO2 and nitrogen oxides from the flue gas, thereby preventing air pollution caused by direct emission of flue gas, and reducing the probability of flue gas pipe blockage.

[0005] The flue gas purification device for a power plant boiler according to an embodiment of the present invention includes a flue gas conveying pipe, a purification box, and a water injection assembly. The first end of the flue gas conveying pipe is connected to the 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 being connected to the purification chamber. The second end of the flue gas conveying pipe extends to the bottom of the purification chamber. The water injection assembly includes a water injection pipe and a nozzle, the nozzle being disposed inside the purification chamber and 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 passes through the top wall of the purification chamber, and the other end passes 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 drive assembly for driving the water injection pipe to rotate, the drive assembly being 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, all of which are connected to the outer wall of the water injection pipe and are located on 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 to each other and connected. The first pipe section is connected to the flue gas outlet of the boiler, and a portion of the second pipe section is located outside the purification chamber, while another portion is located inside the purification chamber. The flue gas purification device for power plant boilers further 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 being disposed within the first pipe segment and rotatably connected to the first pipe segment, the first scrapers abutting against the inner wall of the first pipe segment, and the plurality of first scrapers being 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 being disposed within the second pipe segment and rotatably connected to the second pipe segment, the second scrapers abutting against the inner wall of the second pipe segment, and the plurality of second scrapers being connected to the second rotating rod.

[0012] In some embodiments, the first rotating rod is perpendicular to the water injection pipe, and a first transmission assembly is provided between the first rotating rod and the water injection pipe to enable the first rotating rod and the water injection pipe to 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 to enable the second rotating rod and the water injection pipe to rotate synchronously.

[0013] In some embodiments, the purification box further includes an installation cavity located below the purification cavity, the installation cavity being non-communicating with the purification cavity, and the second transmission assembly being located within the installation cavity.

[0014] In some embodiments, the first pipe section is provided with a flushing pipe, and the flushing pipe is provided with a valve body to control the opening and closing of the flushing pipe.

[0015] The flue gas purification device for power plant boilers in this embodiment of the invention injects lime powder into the purification chamber through the powder injection port and injects water into the purification chamber through the water injection pipe and nozzle. The lime powder and water are mixed to form lime water. The flue gas conveying pipe can transport 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 can fully contact the lime water before being discharged. The lime water can fully filter the flue gas discharged from the boiler, removing dust, CO, CO2, SO2 and nitrogen oxides from the flue gas, thereby preventing air pollution caused by direct emission of flue gas, and reducing the probability of flue gas pipe blockage. Attached Figure Description

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

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

[0018] Figure 3 is a schematic diagram of the internal structure of the 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 is an enlarged schematic diagram of point A in Figure 1.

[0020] Figure label:

[0021] 100. Flue gas purification device;

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

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

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

[0025] 4. Base;

[0026] 5. Drive 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. Flue gas outlet. Detailed Implementation

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

[0033] As shown in Figures 1 and 2, the flue gas purification device 100 for a power plant boiler according to 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 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. 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 disposed in the purification chamber 21 and is connected to the water injection pipe 31.

[0034] The flue gas purification device 100 for power plant boilers in this embodiment of the invention injects lime powder into the purification chamber 21 through the powder injection port, and injects water into the purification chamber 21 through the water injection pipe 31 and the nozzle 32. The lime powder and water are mixed to form lime water. The flue gas conveying pipe 1 can transport 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 can fully contact the lime water before being discharged. The lime water can fully filter the flue gas discharged from the boiler 200, removing dust, CO, CO2, SO2 and nitrogen oxides from the flue gas, thereby preventing air pollution caused by direct emission of flue gas, and reducing the probability of flue gas pipe blockage.

[0035] Understandably, the upper side of the purification box 2 has an exhaust port, through which the flue gas filtered by lime water is discharged.

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

[0037] In some embodiments, as shown in FIG2, the water injection assembly 3 further includes an annular pipe 33, the water injection pipe 31 is connected to the annular pipe 33, and there are multiple nozzles 32. The multiple nozzles 32 are evenly distributed along the circumference of the annular pipe 33 and are connected to the annular pipe 33.

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

[0039] Optionally, as shown in Figure 1, the spray direction of the nozzle 32 is tilted outward from top to bottom.

[0040] In some embodiments, one end of the water injection pipe 31 passes through the top wall of the purification chamber 21, and the other end passes 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 rotation, making the water flow distribution more uniform. At the same time, the water flow sprayed from multiple nozzles 32 can form a vortex during rotation, which is more conducive to the mixing of water and lime powder.

[0042] In addition, when the lime water reaches saturation in its ability to purify flue gas, it needs to be discharged. After that, 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, making the cleaning of the cavity wall of the purification chamber 21 more uniform and thorough.

[0043] As an example, as shown in Figure 2, the water injection pipe 31 extends vertically, passes through the top 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 rotary joint, and the water injection pipe 31 can rotate relative to the water supply pipe 311, while water can be supplied to the water injection pipe 31.

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

[0045] A baffle plate is provided on the water injection pipe 31. The baffle plate is located on the lower side of the annular pipe 33 and close to the annular pipe 33. The baffle plate 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, which is enough to transport the water to the annular pipe 33.

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

[0047] In some embodiments, as shown in FIG1, the flue gas purification device 100 for power plant boilers further includes a drive assembly 5 for driving the water injection pipe 31 to rotate, and the drive assembly 5 is connected to the purification box 2.

[0048] The drive component 5 can provide power for the rotation of the water injection pipe 31, making the water injection pipe 31 rotate automatically and making operation more convenient.

[0049] In some embodiments, as shown in FIG2, the flue gas purification device 100 for power plant boilers further includes a plurality of stirring blades 6, all of which are connected to the outer wall of the water injection pipe 31, and the stirring blades 6 are located on the lower side of the nozzle 32.

[0050] By setting the stirring blade 6, the stirring blade 6 can rotate with the water injection pipe 31, thereby making the water flow and lime powder fully mixed.

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

[0052] As an example, as shown in Figure 2, the stirring rod is long and extends radially along the water injection pipe 31. The stirring rod is fixedly connected to the outer wall of the water injection pipe 31. At least two stirring rods are arranged as a group, and multiple groups of stirring rods are provided. The multiple groups of stirring rods are evenly distributed along the axial direction of the water injection pipe 31. The simultaneous rotation of multiple stirring rods makes the lime powder and water fully mixed, thereby improving the filtration effect on the flue gas discharged from the boiler 200.

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

[0054] In some embodiments, as shown in Figures 1 and 2, the flue gas conveying pipe 1 includes a first pipe section 11 and a second pipe section 12 that are perpendicular to each other and connected. The first pipe section 11 is connected to the flue gas outlet 201 of the boiler 200. A portion of the second pipe section 12 is located outside the purification chamber 21, and another portion is located inside the purification chamber 21. The flue gas purification device 100 for power plant boilers 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 prone to blockage.

[0056] The first cleaning component 71 and the second cleaning component 72 can clean the inner wall of the flue gas conveying pipe 1, removing impurities adhering to the inner wall of the flue gas conveying pipe 1, thereby reducing the probability of blockage in the flue gas conveying pipe 1 and ensuring the normal use of the flue gas conveying pipe 1.

[0057] As an example, the first pipe section 11 extends horizontally, and the second pipe section 12 extends vertically and is parallel to the water injection pipe 31. The second pipe section 12 is located on the side of the water injection pipe 31 near 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 section 12 during rotation.

[0058] In some embodiments, as shown in FIG3, the first cleaning assembly 71 includes a first rotating rod 711 and a plurality of first scrapers 712. The first rotating rod 711 is disposed within the first pipe section 11 and rotatably connected to the first pipe section 11. The first scrapers 712 abut against the inner wall of the first pipe section 11. The plurality of first scrapers 712 are all connected to the first rotating rod 711. And / or the second cleaning assembly 72 includes a second rotating rod 721 and a plurality of second scrapers 722. The second rotating rod 721 is disposed within the second pipe section 12 and rotatably connected to the second pipe section 12. The second scrapers 722 abut against the inner wall of the second pipe section 12. The plurality of second scrapers 722 are all connected to the second rotating rod 721.

[0059] With the above configuration, multiple first scrapers 712 rotate with the first rotating rod 711 to clean the inner wall of the first pipe section 11 and remove impurities attached to the inner wall of the first pipe section 11. Multiple second scrapers 722 rotate with the second rotating rod 721 to clean the inner wall of the second pipe section 12 and remove impurities attached to the second pipe section 12, thereby reducing the probability of blockage in the flue gas conveying pipe 1.

[0060] As an example, as shown in FIG3, 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 are grouped together, and 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 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, and multiple second scrapers 722 within the same group are evenly distributed circumferentially along the second rotating rod 721. Multiple groups of second scrapers 722 are evenly distributed axially along the second rotating rod 721, thereby enabling a more comprehensive and thorough cleaning of the inner wall of the second pipe section 12.

[0062] In some embodiments, as shown in FIG1, the first rotating rod 711 is perpendicular to the water injection pipe 31, 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 drive assembly 5. The first transmission assembly 81 drives the first rotating rod 711 to rotate, and the second transmission assembly 82 drives the second rotating rod 721 to rotate. Thus, only one power source, the drive assembly 5, is needed 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 lime water and the cleaning of flue gas conveying pipe 1. The control is more convenient and more energy-saving.

[0064] Optionally, as shown in Figure 4, the first transmission assembly 81 includes a first bevel gear 811 and a second bevel gear 812 that mesh with each other. The first bevel gear 811 is mounted on the first rotating rod 711 and rotates synchronously with it, and the second bevel gear 812 is mounted on the water injection pipe 31 and rotates synchronously with it.

[0065] As an example, as shown in Figures 1 and 4, the first rotating rod 711 passes through the wall of the flue gas conveying pipe 1 and extends to the water injection pipe 31. The first rotating rod 711 is rotatably connected to the wall of the flue gas conveying pipe 1 through a bearing, which can improve the smoothness of the rotation of the first rotating rod 711. The drive assembly 5 includes a motor 51 and a third bevel gear 52. The motor 51 is located 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 meshes with the second bevel gear 812. Thus, the motor 51 drives the third bevel gear 52 to rotate, which in turn drives the water injection pipe 31 to rotate through the second bevel gear 812. At the same time, since the second bevel gear 812 meshes with the first bevel gear 811, it can drive the first rotating rod 711 to rotate, thereby cleaning the inner wall of the first pipe section 11.

[0066] Optionally, as shown in Figure 2, 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 fitted onto the water injection pipe 31 rotates, the chain 822 can drive the sprocket 821 fitted onto the second rotating rod 721 to rotate, thereby driving the second rotating rod 721 to rotate, thus cleaning the inner wall of the second pipe section 12.

[0068] In some embodiments, as shown in FIG2, the purification chamber 2 further has a mounting cavity 22, which is located below the purification chamber 21. The mounting cavity 22 and the purification chamber 21 are not in communication with each other, and the second transmission assembly 82 is located in the mounting cavity 22.

[0069] By placing the second transmission component 82 in the mounting cavity 22, the second transmission component 82 can be separated from the lime water in the purification cavity 21, thus protecting the second transmission component 82 and preventing the lime water from damaging it.

[0070] As an example, as shown in Figure 2, the lower end of the second pipe section 12 has a gap with the bottom wall of the purification chamber 21, allowing the flue gas to be discharged smoothly; the second rotating rod 721 is inserted upward into the interior of the second pipe section 12 from the lower end 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 mounting chamber 22) and is rotatably connected to it 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 to it through a bearing; two sprockets 821 are respectively fitted onto the water injection pipe 31 and the second rotating rod 721; 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, as shown in FIG1, 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 opening and closing of the flushing pipe 9.

[0072] By adjusting the flushing pipe 9 to the connected state through the valve body 91, 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. This can flush away the impurities cleaned from the inner wall of the flue gas conveying pipe 1, thereby improving the cleaning effect of the flue gas conveying pipe 1.

[0073] Optionally, when the lime water reaches saturation in purifying the flue gas, before discharging the lime water from the purification chamber 21, the valve body 91 can be opened to adjust the flushing pipe 9 to the connected state, and water can be injected into the flue gas delivery pipe 1 through the flushing pipe 9 for flushing.

[0074] As a result, the impurities removed from the flue gas conveying pipe 1 are flushed into the purification chamber 21 and discharged outward with the lime water.

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

[0076] Therefore, the on / off state of the flushing pipe 9 can be remotely controlled, making operation more convenient.

[0077] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0078] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0079] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0080] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0081] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0082] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A flue gas purification device (100) for power plant boilers, characterized in that, include: A flue gas conveying pipe (1), the first end of which is connected to the flue gas outlet (201) of the boiler (200); The purification box (2) has a purification chamber (21) and a powder injection port 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). Water injection assembly (3), the water injection assembly (3) includes water injection pipe (31) and nozzle (32), the nozzle (32) is located in the purification chamber (21), and the nozzle (32) is connected to the water injection pipe (31).

2. The flue gas purification device (100) for power plant boilers according to claim 1, characterized in that, 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). The multiple nozzles (32) are evenly distributed along the circumference of the annular pipe (33) and are connected to the annular pipe (33).

3. The flue gas purification device (100) for power plant boilers according to claim 2, characterized in that, One end of the water injection pipe (31) passes through the top wall of the purification chamber (21), and the other end passes 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 power plant boilers according to claim 3, characterized in that, It also includes a drive assembly (5) for driving the water injection pipe (31) to rotate, the drive assembly (5) being 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 multiple stirring blades (6), each of which is connected to the outer wall of the water injection pipe (31), and the stirring blades (6) are located on the lower side of the nozzle (32).

6. The flue gas purification device (100) for a power plant boiler according to claim 4, characterized in that, The flue gas conveying pipe (1) includes a first pipe section (11) and a second pipe section (12) that are perpendicular to each other and connected. The first pipe section (11) is connected to the flue gas outlet (201) of the boiler (200). A part of the second pipe section (12) is located outside the purification chamber (21), and another part is located inside the purification chamber (21). The flue gas purification device (100) for power plant boilers further 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).

7. The flue gas purification device (100) for a power plant boiler according to claim 6, characterized in that, The first cleaning assembly (71) includes a first rotating rod (711) and a plurality of first scraper blades (712). The first rotating rod (711) is disposed within the first pipe section (11) and rotatably connected to the first pipe section (11). The first scraper blades (712) abut against the inner wall of the first pipe section (11). The plurality of first scraper blades (712) are all connected to the first rotating rod (711); and / or The second cleaning assembly (72) includes a second rotating rod (721) and a plurality of second scrapers (722). The second rotating rod (721) is disposed inside the second pipe section (12) and is rotatably connected to the second pipe section (12). The second scrapers (722) abut against the inner wall of the second pipe section (12). 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) is perpendicular to the water injection pipe (31), and a first transmission assembly (81) is provided between the first rotating rod (711) and the water injection pipe (31) to enable the first rotating rod (711) and the water injection pipe (31) to 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) also has an installation cavity (22), which is located on the lower side of the purification cavity (21). The installation cavity (22) is not connected to the purification cavity (21), and the second transmission component (82) is located in the installation cavity (22).

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

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