A flue gas purification device for coal-fired boilers

Abstract

This invention relates to the field of flue gas purification technology, specifically to a flue gas purification device for a coal-fired boiler. The device includes a water tank containing a purification liquid. A conduit with its bottom end below the liquid surface is inserted into the water tank. A vertically rotating mounting rod is inserted into the water tank, penetrating through it. A bracket is evenly and fixedly mounted on the mounting rod within the water tank, and a filter screen is embedded in the bracket. A through hole is formed on the mounting rod, and a first fan blade is fixedly installed within the through hole. The first fan blade blows air upwards, and a heat dissipation cavity is formed on the bracket. By configuring the mounting rod, the first fan blade, the filter screen, the bracket, and the limiting plate, moisture in the water vapor can be recovered. Furthermore, the first fan blade drives the gas flow in the through hole, thereby reducing the temperature of the bracket, decreasing the evaporation of the purification liquid, preventing the growth of small bubbles, increasing the probability of impurities in the small bubbles contacting the purification liquid, and improving the purification effect on the flue gas.

Description

Technical Field

[0001] This invention relates to the field of flue gas purification technology, and in particular to a flue gas purification device for coal-fired boilers. Background Technology

[0002] The main elements that make up the organic matter of coal are carbon, hydrogen, oxygen, nitrogen and sulfur. In addition, there are trace amounts of phosphorus, fluorine, chlorine and arsenic. During combustion, the flue gas produced by sulfur, phosphorus and other substances can cause serious pollution to the environment. Chinese Patent No. CN110124347B discloses a water-saving and energy-saving flue gas purification device and method, which can fully utilize the waste heat of flue gas while significantly reducing the water consumption of the flue gas purification device, and also reduce the coal consumption per unit power generation of the generator set.

[0003] While the aforementioned patents can utilize waste heat from flue gas, they still have the following shortcomings: The flue gas temperature is high, and when the flue gas comes into contact with water, the water temperature rises, which accelerates the water evaporation rate. As a result, water needs to be added frequently, leading to water waste and increasing the labor intensity of the staff. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a flue gas purification device for coal-fired boilers to solve the problem that when flue gas comes into contact with water, the water temperature rises, thereby accelerating the water evaporation rate.

[0005] To achieve the above objectives, the present invention provides a flue gas purification device for a coal-fired boiler, comprising a water tank containing a purification liquid, a conduit with its bottom end below the liquid surface inserted into the water tank, an installation rod vertically and rotatably inserted into the water tank, the installation rod penetrating the water tank, a bracket evenly and fixedly installed on the part of the installation rod located inside the water tank, a filter screen embedded in the bracket, a through hole penetrating the installation rod, a first fan blade fixedly installed in the through hole, the first fan blade being used to blow air upwards, a heat dissipation cavity being opened on the bracket, and holes communicating at both ends with the heat dissipation cavity and the through hole respectively on the installation rod; Also includes: The reflux mechanism works in conjunction with the water tank. The drive mechanism is used to drive the mounting rod to rotate. The impact mechanism includes an inclined plate fixedly installed on the bottom wall of the water tank, a stop bar on the mounting rod that cooperates with the inclined plate, and an elastic element sleeved on the mounting rod, with the two ends of the elastic element cooperating with the water tank and the mounting rod respectively.

[0006] Furthermore, the reflux mechanism includes a cooling box fixedly installed on the top wall of the water tank. The air inlet of the cooling box is connected to the water tank. An installation rod passes through the cooling box. A limit plate is installed inside the cooling box. Air holes are evenly opened on the limit plate, and the bottom wall of the limit plate is inclined.

[0007] Furthermore, the drive mechanism includes a limiting sleeve fixedly inserted into the top wall of the cooling box, a mounting rod passing through the limiting sleeve, and a second fan blade fixedly installed at the part of the mounting rod located inside the limiting sleeve.

[0008] Furthermore, a circular ring is fixedly installed on the inner bottom wall of the cooling box, and return pipes extending to the water tank are evenly inserted on the inner bottom wall of the cooling box. The return pipes are located between the inner side wall of the cooling box and the outer wall of the circular ring, and a one-way valve is fixedly installed at the bottom end of the return pipes.

[0009] Furthermore, the baffle is horizontally rotatably inserted into the mounting rod, and a baffle plate is fixedly installed at the end of the baffle.

[0010] Furthermore, a dust-collecting plate is embedded in the inner bottom wall of the water tank, and the dust-collecting plate is made of activated carbon.

[0011] Furthermore, an installation groove is provided on the inner bottom wall of the water tank, and a dust suction plate is installed in the installation groove. An elastic block is provided on the inclined surface of the inclined plate, and a cavity is provided on the elastic block. An inlet valve and a drain valve are installed on the bottom wall of the cavity, and an inlet pipe extending to the bottom wall of the installation groove is fixedly installed on the input end of the inlet valve.

[0012] Furthermore, an installation hole is provided on the side wall of the mounting rod, the stop rod is rotatably installed in the installation hole, a limit cover is rotatably fitted on the mounting rod, the output end of the drain valve is connected to the limit cover, and a connecting channel is provided on the side wall of the mounting rod, with both ends connected to the limit cover and the installation hole respectively.

[0013] The beneficial effects of this invention are as follows: by setting up an installation rod, a first fan blade, a filter screen, a bracket, and a limiting plate, it is possible to recover moisture from water vapor, and by driving the gas flow in the through hole through the first fan blade, the temperature of the bracket is reduced, the evaporation rate of the purification liquid is reduced, and the volume of small bubbles is prevented from increasing, thereby increasing the probability of impurities in the small bubbles coming into contact with the purification liquid and improving the purification effect on flue gas. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the first overall structure of the present invention; Figure 2 This is a schematic diagram of the second overall mechanism of the present invention; Figure 3 This is a cross-sectional view of the water tank of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 For the present invention Figure 3 Enlarged view of point B in the middle; Figure 6 This is a combined diagram of the mounting rod, the first fan blade, and the second fan blade of the present invention; Figure 7 This is a schematic diagram of the combined structure of the dust collection plate and the water tank of the present invention; Figure 8 This is a cross-sectional view of the elastic block of the present invention.

[0016] The diagram is marked as follows: 1. Water tank; 2. Pipe; 3. Purifying liquid; 4. Mounting rod; 5. Bracket; 6. Filter screen; 7. Through hole; 8. First fan blade; 9. Heat dissipation cavity; 10. Inclined plate; 11. Stop bar; 12. Elastic element; 13. Cooling box; 14. Limiting plate; 15. Limiting sleeve; 16. Second fan blade; 17. Ring; 18. Return pipe; 19. One-way valve; 20. Baffle plate; 21. Dust suction plate; 22. Mounting groove; 23. Elastic block; 24. Cavity; 25. Water inlet valve; 26. Drain valve; 27. Water inlet pipe; 28. Mounting hole; 29. ​​Limiting cover; 30. Connecting channel. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0018] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0019] like Figures 1 to 8As shown, a flue gas purification device for a coal-fired boiler includes a water tank 1 containing a purification liquid 3. A conduit 2 with its bottom end below the liquid surface is inserted into the water tank 1. An installation rod 4 is vertically and rotatably inserted into the water tank 1, penetrating the water tank 1. A bracket 5 is uniformly and fixedly installed on the part of the installation rod 4 located inside the water tank 1. A filter screen 6 is embedded in the bracket 5. A through hole 7 is opened on the installation rod 4, and a first fan blade 8 is fixedly installed in the through hole 7. The first fan blade 8 can rotate with the installation rod 4 and is used to blow air upwards. A heat dissipation cavity 9 is opened on the bracket 5, and the installation rod 4 has holes at both ends communicating with the heat dissipation cavity 9 and the through hole 7, respectively. Also includes: A reflux mechanism is used in conjunction with water tank 1; A drive mechanism is used to drive the mounting rod 4 to rotate; The impact mechanism includes an inclined plate 10 fixedly installed on the bottom wall of the water tank 1, a stop bar 11 that cooperates with the inclined plate 10 on the mounting rod 4, and an elastic element 12 sleeved on the mounting rod 4, with both ends of the elastic element 12 cooperating with the water tank 1 and the mounting rod 4 respectively.

[0020] The reflux mechanism includes a cooling box 13 fixedly installed on the top wall of the water tank 1. The air inlet of the cooling box 13 is connected to the water tank 1. The mounting rod 4 passes through the cooling box 13. A limiting plate 14 is installed inside the cooling box 13. Air holes are evenly opened on the limiting plate 14, and the bottom wall of the limiting plate 14 is inclined.

[0021] The drive mechanism includes a limiting sleeve 15 fixedly inserted into the top wall of the cooling box 13, the mounting rod 4 passing through the limiting sleeve 15, and a second fan blade 16 fixedly installed on the part of the mounting rod 4 located inside the limiting sleeve 15.

[0022] First, a purification liquid 3 capable of purifying pollutants in flue gas is filled into water tank 1. Flue gas discharged from the coal-fired boiler is injected into the water tank 1 below the liquid surface through pipe 2. At this time, the gas flows upward in the form of bubbles. During this process, harmful substances and soot in the bubbles come into contact with the purification liquid 3 in water tank 1. The harmful substances are purified by contact with the purification liquid 3, and the soot dissolves into the water, thereby achieving flue gas purification. At the same time, the rising bubbles pass through the filter screen 6. During this process, the large bubbles that have gathered together are broken into small bubbles, thereby increasing the probability of contact between impurities in the bubbles and the purification liquid 3, and improving the purification effect.

[0023] Moist bubbles emerging from the purification liquid 3 flow upwards and into the cooling tank 13. During this process, the moist, high-temperature gas comes into contact with the low-temperature limiting plate 14. At this time, the high-temperature, moist gas liquefies into water droplets upon cooling. The gas entering the cooling tank 13 is discharged outwards through the limiting sleeve 15. As the airflow passes through the limiting sleeve 15, since the diameter of the limiting sleeve 15 is smaller than the diameter of the air inlet of the cooling tank 13, when the airflow passes through the limiting sleeve 15, it is impacted by the second fan blade 16, which has a single blade sidewall area of ​​15-20 square centimeters. The impact force of the airflow can cause the second fan blade 16 to rotate. At this time, the second fan blade 16 drives the mounting rod 4 to rotate, thus driving the mounting rod 4 to rotate. The water droplets on the bottom wall of the limiting plate 14 flow along the bottom wall of the limiting plate 14 under the action of gravity and centrifugal force. Finally, the small water droplets drip down under the action of gravity and flow back into the water tank 1, thereby realizing the recovery of water vapor, reducing the number of times the staff add water to the water tank 1, and playing a role in saving water resources.

[0024] Meanwhile, as the mounting rod 4 rotates, the first blade 8, which is fixedly installed in the through hole 7, rotates. During the rotation of the first blade 8, the first blade 8 draws air from the bottom of the mounting rod 4 into the through hole 7 and then discharges it upwards. During this process, due to the high air velocity and low pressure, the end of the hole located in the through hole 7 is under negative pressure, which can draw in the hot air in the heat dissipation cavity 9, thereby reducing the temperature of the bracket 5 and cooling the purification liquid 3 in the water tank 1. This reduces the evaporation of the purification liquid 3 and further reduces the number of times the staff needs to add water.

[0025] During the rotation of the mounting rod 4, the stop bar 11 on the side wall of the mounting rod 4 moves up along the inclined plane, and the elastic element 12 is squeezed. When the stop bar 11 moves to the highest point, the elastic element 12 is in a state of maximum compression. At this time, the mounting rod 4 continues to rotate, so the stop bar 11 disengages from the inclined plane of the inclined plate 10, and the elastic element 12 returns to its original state and pushes the mounting rod 4 down. At this time, the mounting rod 4 drives the bracket 5 and the filter screen 6 to move down, thereby applying an instantaneous impact force to the bubbles on the bottom wall of the bracket 5 and the filter screen 6. Under the action of the impact force, the small bubbles move down, thereby prolonging the time of the bubbles in the purification liquid 3, increasing the probability of contact between the impurities in the bubbles and the purification liquid 3, and improving the purification effect of the flue gas. Furthermore, after the water temperature is lowered, it can prevent the small bubbles in the water from expanding due to heat, allowing the impurities in the small bubbles to contact the purification liquid 3, which plays a role in improving the purification effect of the flue gas.

[0026] Since the stop bar 11 is immersed in the purification liquid 3, it can be lubricated by the purification liquid 3 during the rotation of the stop bar 11, thereby reducing the resistance encountered by the stop bar 11 during the rotation and ensuring that the stop bar 11 can move normally along the inclined plate 10.

[0027] like Figure 4 As shown, a circular ring 17 is fixedly installed on the inner bottom wall of the cooling box 13. Return pipes 18 extending to the water tank 1 are evenly inserted on the inner bottom wall of the cooling box 13. The return pipes 18 are located between the inner side wall of the cooling box 13 and the outer wall of the circular ring 17. A one-way valve 19 is fixedly installed at the bottom end of the return pipe 18. The one-way valve 19 is used to prevent the water droplets on the surface of the inclined groove from being impacted by the airflow discharged from the water tank 1 from evaporating again.

[0028] During the rotation of the limiting plate 14, the small droplets that have liquefied and adhered to the bottom wall of the limiting plate 14 move away from the mounting rod 4 under the action of centrifugal force and eventually gather at the edge of the inclined groove. As the small droplets gather at the edge of the inclined groove, the small droplets gradually fall downwards. The falling small droplets are restricted in position by the ring 17 and eventually flow into the water tank 1 along the return pipe 18.

[0029] like Figure 5 As shown, the baffle 11 is horizontally rotatably inserted into the mounting rod 4, and a baffle 20 is fixedly installed at the end of the baffle 11.

[0030] By rotating the baffle 11 onto the mounting rod 4, the friction force on the baffle 11 can be reduced, allowing the baffle 11 to experience rolling friction as it moves along the inclined plate 10, thus ensuring that the baffle 11 can move normally. Furthermore, during the rolling process of the baffle 11, the baffle 11 drives the baffle 20 to rotate, which in turn causes the bubbles in the water tank 1 to sway, further increasing the probability of contact between impurities in the small bubbles and the purification liquid 3. At the same time, it can make the temperature of the purification liquid 3 uniform, thereby improving the purification effect and reducing the evaporation of the purification liquid 3.

[0031] like Figure 7 As shown, a dust-collecting plate 21 is embedded in the inner bottom wall of the water tank 1, and the dust-collecting plate 21 is made of activated carbon.

[0032] During the rotation of the baffle plate 20, the solid impurities stirred by the baffle plate 20 flow downwards around the baffle plate 20. When the flowing impurities come into contact with the dust collection plate 21, the impurities are adsorbed by the dust collection plate 21, thereby reducing the dust content in the purification liquid 3 and improving the purification effect.

[0033] like Figure 5 , Figure 7 As shown, an installation groove 22 is provided on the inner bottom wall of the water tank 1, the dust suction plate 21 is installed in the installation groove 22, an elastic block 23 is provided on the inclined surface of the inclined plate 10, a cavity 24 is provided on the elastic block 23, an inlet valve 25 and a drain valve 26 are installed on the bottom wall of the cavity 24, and an inlet pipe 27 extending to the bottom wall of the installation groove 22 is fixedly installed on the input end of the inlet valve 25.

[0034] When the stop bar 11 moves along the inclined plane of the inclined block, the position of the stop bar 11 can be limited at any time under the action of the elastic block 23, thereby preventing the stop bar 11 from rolling down along the inclined plane 10 and ensuring that the stop bar 11 can move up along the inclined plane 10. When the stop bar 11 disengages from the elastic block 23, the elastic block 23 returns to its original position, and the cavity 24 draws water through the water inlet valve 25 and the water inlet pipe 27, thereby creating a negative pressure state in the space between the bottom wall of the mounting groove 22 and the bottom wall of the dust collection plate 21. Under the action of the negative pressure state, the dust-containing water around the dust collection plate 21 can be drawn in, thereby improving the dust adsorption effect of the dust collection plate 21.

[0035] like Figure 7 As shown, the mounting rod 4 has a mounting hole 28 on its side wall, the stop rod 11 is rotatably installed in the mounting hole 28, the mounting rod 4 is rotatably fitted with a limiting cover 29, the output end of the drain valve 26 is connected to the limiting cover 29, and the mounting rod 4 has a connecting channel 30 with both ends connected to the limiting cover 29 and the mounting hole 28 respectively.

[0036] When the elastic block 23 is squeezed, the water in the cavity 24 is discharged into the limiting cover 29 through the drain valve 26. Then the water pressure in the limiting cover 29 increases, and under the action of the dust suction plate 21, the water discharged from the cavity 24 does not contain impurities. Therefore, the high-pressure water in the limiting cover 29 will pass through the gap between the limiting cover 29 and the mounting rod 4 and the gap between the stop rod 11 and the mounting hole 28 and be discharged into the water tank 1. This will blow out the solid dust in the two gaps and further reduce the resistance encountered by the stop rod 11 during rotation, thus ensuring that the mounting rod 4 can rotate normally.

[0037] Working principle: The flue gas discharged from the coal-fired boiler is injected into the water tank 1 below the liquid surface through the conduit 2. At this time, the gas flows upward in the form of bubbles. The harmful substances and soot in the bubbles come into contact with the purification liquid 3 in the water tank 1. The harmful substances are purified by contact with the purification liquid 3, and the soot dissolves into the water, thus achieving flue gas purification. At the same time, the rising bubbles pass through the filter screen 6. In this process, the large bubbles that have gathered together are broken into smaller bubbles, thereby increasing the probability of impurities in the bubbles coming into contact with the purification liquid 3. The moist bubbles emerging from the purification liquid 3 flow upward and into the cooling box 13. In this process, the moist, high-temperature gas comes into contact with the low-temperature limiting plate 14. At this time, the high-temperature, moist gas is cooled down. When the humid gas cools, it liquefies into water droplets. The gas entering the cooling tank 13 is discharged outward through the limiting sleeve 15. During the process of the airflow passing through the limiting sleeve 15, since the diameter of the limiting sleeve 15 is smaller than the diameter of the air inlet of the cooling tank 13, the impact force of the airflow can cause the second fan blade 16 to rotate. At this time, the second fan blade 16 drives the mounting rod 4 to rotate, thus driving the mounting rod 4 to rotate. The water droplets on the bottom wall of the limiting plate 14 flow along the bottom wall of the limiting plate 14 under the action of gravity and centrifugal force. Finally, the small water droplets drip down under the action of gravity and flow back into the water tank 1. At the same time, during the rotation of the mounting rod 4, the first fan blade in the through hole 7... As the first blade 8 rotates, it draws air from the bottom of the mounting rod 4 into the through hole 7 and then discharges it upwards. During this process, due to the high air velocity and low pressure, the end of the hole located within the through hole 7 is under negative pressure, which allows it to draw in hot air from the heat dissipation cavity 9, thereby reducing the temperature of the bracket 5. As the mounting rod 4 rotates, the stop bar 11 on the side wall of the mounting rod 4 moves up the inclined plane, and the elastic element 12 is compressed. When the stop bar 11 reaches its highest point, the elastic element 12 is under maximum compression. At this time, the mounting rod 4 continues to rotate, so the stop bar 11 disengages from the inclined plane of the inclined plate 10, and the elastic element 12 returns to its original position and pushes back. When the mounting rod 4 moves downward, it causes the bracket 5 and filter screen 6 to move downward, thus applying an instantaneous impact force to the air bubbles on the bottom wall of the bracket 5 and filter screen 6. Under the action of the impact force, the small air bubbles move downward, thereby prolonging the time the air bubbles spend in the purification liquid 3, increasing the probability of contact between the impurities in the air bubbles and the purification liquid 3, and improving the purification effect on the flue gas. Furthermore, after the water temperature is lowered, it can prevent the small air bubbles in the water from expanding due to heat, allowing the impurities in the small air bubbles to come into contact with the purification liquid 3. Since the baffle rod 11 is immersed in the purification liquid 3, it can be lubricated by the purification liquid 3 during the rotation of the baffle rod 11, thereby reducing the resistance encountered by the baffle rod 11 during the rotation.

[0038] During the rotation of the limiting plate 14, the liquefied droplets attached to the bottom wall of the limiting plate 14 move away from the mounting rod 4 under the action of centrifugal force, and eventually gather at the edge of the inclined trough. As the droplets gather at the edge of the inclined trough, they gradually fall downwards. The falling droplets are restricted in position by the ring 17 and eventually flow into the water tank 1 along the return pipe 18. By rotating the baffle 11 onto the mounting rod 4, the friction force on the baffle 11 can be reduced, so that the baffle 11 is subjected to rolling friction when it moves along the inclined plate 10, which ensures that the baffle 11 can move normally. In addition, during the rolling of the baffle 11, the baffle 11 drives the baffle 20 to rotate, which can cause the bubbles in the water tank 1 to shake, further increasing the contact probability between impurities in the small bubbles and the purification liquid 3.

[0039] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0040] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A flue gas purification device for a coal-fired boiler, comprising a water tank (1) containing a purification liquid (3), characterized in that: The water tank (1) is provided with a conduit (2) with its bottom end below the liquid surface. The water tank (1) is provided with a vertically rotating mounting rod (4) that penetrates the water tank (1). The mounting rod (4) is provided with a bracket (5) that is evenly fixedly installed on the part of the mounting rod (4) inside the water tank (1). The bracket (5) is provided with a filter screen (6). The mounting rod (4) is provided with a through hole (7) that penetrates the mounting rod (4). The through hole (7) is provided with a first fan blade (8) that can rotate with the mounting rod (4). The first fan blade (8) is used to blow air upwards. The bracket (5) is provided with a heat dissipation cavity (9). The mounting rod (4) is provided with holes at both ends that are connected to the heat dissipation cavity (9) and the through hole (7) respectively. Also includes: A reflux mechanism, which cooperates with the water tank (1); A drive mechanism for driving the mounting rod (4) to rotate; The impact mechanism includes an inclined plate (10) fixedly installed on the bottom wall of the water tank (1), a stop bar (11) that cooperates with the inclined plate (10) is provided on the mounting rod (4), and an elastic element (12) is sleeved on the mounting rod (4), with the two ends of the elastic element (12) cooperating with the water tank (1) and the mounting rod (4) respectively. In this process, the temperature of the bubbles in contact with the filter screen (6) can be reduced by the cooperation of the driving mechanism and the impact mechanism, and a downward impact force can be applied to the bubbles after the temperature has been reduced. The reflux mechanism includes a cooling box (13) fixedly installed on the top wall of the water tank (1). The air inlet of the cooling box (13) is connected to the water tank (1). The mounting rod (4) passes through the cooling box (13). A limiting plate (14) is installed inside the cooling box (13). Air holes are evenly opened on the limiting plate (14), and the bottom wall of the limiting plate (14) is inclined. The drive mechanism includes a limiting sleeve (15) fixedly inserted into the top wall of the cooling box (13), the mounting rod (4) passes through the limiting sleeve (15), and a second fan blade (16) is fixedly installed on the part of the mounting rod (4) located inside the limiting sleeve (15).

2. The flue gas purification device for a coal-fired boiler according to claim 1, characterized in that, A ring (17) is fixedly installed on the inner bottom wall of the cooling box (13). A return pipe (18) extending to the water tank (1) is evenly inserted on the inner bottom wall of the cooling box (13). The return pipe (18) is located between the inner side wall of the cooling box (13) and the outer wall of the ring (17). A one-way valve (19) is fixedly installed at the bottom end of the return pipe (18).

3. The flue gas purification device for a coal-fired boiler according to claim 2, characterized in that, The baffle (11) is horizontally rotatably inserted into the mounting rod (4), and a baffle (20) is fixedly installed at the end of the baffle (11).

4. The flue gas purification device for a coal-fired boiler according to claim 3, characterized in that, The water tank (1) is equipped with a dust-collecting plate (21) embedded in the inner bottom wall, and the dust-collecting plate (21) is made of activated carbon.

5. The flue gas purification device for a coal-fired boiler according to claim 4, characterized in that, The water tank (1) has an installation groove (22) on its inner bottom wall. The dust suction plate (21) is installed in the installation groove (22). The inclined plate (10) has an elastic block (23) on its inclined surface. The elastic block (23) has a cavity (24). The bottom wall of the cavity (24) is equipped with a water inlet valve (25) and a drain valve (26). The input end of the water inlet valve (25) is fixedly installed with a water inlet pipe (27) extending to the bottom wall of the installation groove (22).

6. The flue gas purification device for a coal-fired boiler according to claim 5, characterized in that, The mounting rod (4) has a mounting hole (28) on its side wall. The stop rod (11) is rotatably installed in the mounting hole (28). A limiting cover (29) is rotatably fitted on the mounting rod (4). The output end of the drain valve (26) is connected to the limiting cover (29). A connecting channel (30) is provided on the side wall of the mounting rod (4) with both ends connected to the limiting cover (29) and the mounting hole (28) respectively.

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