Flue gas purification system for thermal power plant

Abstract

A flue gas purification system for a thermal power plant, relating to the technical field of flue gas treatment, comprising a first bracket (1), a condensing mechanism (2), disposed on the first bracket (1), a purification mechanism (3), disposed on a second bracket (11), and a smoke exhaust mechanism (4), disposed on a third bracket (12). The condensing mechanism (2) and the smoke exhaust mechanism (4) are respectively disposed on two sides of the purification mechanism (3), so that in a power generation process, a smoke gas containing harmful substances is discharged into the condensing mechanism (2) to undergo condensing and cooling, and heat in the smoke gas is collected, transferred, and reused, thereby saving heat energy, the cooled flue gas enters the purification mechanism (3) to purify and eliminate some harmful substances in the flue gas, and the flue gas having undergone purification and elimination of the harmful substances is sucked away by the smoke exhaust mechanism (4) and filtered and then discharged, thereby implementing purification of the harmful substances in the flue gas while utilizing waste heat of the flue gas and preventing the discharged flue gas from causing severe environmental pollution.

Description

A flue gas purification system for thermal power plants Technical Field

[0001] This invention relates to the field of flue gas treatment technology, and in particular to a flue gas purification system for thermal power plants. Background Technology

[0002] A thermal power plant, or coal-fired power plant for short, is a factory that uses combustible materials as fuel to produce electricity. Its basic production process is as follows: when fuel is burned, it heats water to generate steam, which converts the chemical energy of the fuel into heat energy. The steam pressure drives the turbine to rotate, converting the heat energy into mechanical energy. Then, the turbine drives the generator to rotate, converting the mechanical energy into electrical energy. Technical issues

[0003] Thermal power plants generate large amounts of flue gas containing harmful substances such as particulate matter, sulfur dioxide, and nitrogen oxides during the power generation process. If this flue gas is discharged directly into the atmosphere without effective treatment, it will cause serious environmental pollution. Although existing flue gas treatment systems can remove some harmful substances to a certain extent, the treatment effect is still not ideal, and there are problems such as waste of waste gas heat energy.

[0004] Therefore, in view of the above situation, there is an urgent need to develop a flue gas purification system for thermal power plants to overcome the shortcomings in current practical applications. Technical solutions

[0005] This invention provides a flue gas purification system for thermal power plants to overcome the deficiencies in the prior art.

[0006] The present invention provides a flue gas purification system for thermal power plants, comprising: a first support, a condensation mechanism disposed on the first support, a purification mechanism disposed on a second support, and a flue gas exhaust mechanism disposed on a third support, wherein the condensation mechanism and the flue gas exhaust mechanism are respectively disposed on both sides of the purification mechanism.

[0007] Preferably, the condensation mechanism includes an air inlet pipe, which is mounted on the first support. A first filter plate is vertically inserted into the air inlet pipe, and a first insertion hole is formed on the first filter plate. A first locking plate is horizontally inserted into the first insertion hole, and the first locking plate abuts against the top outer wall of the air inlet pipe. A heat exchange box is provided below the air inlet pipe, and a heat exchange tube is provided inside the pipe wall of the air inlet pipe. The inlet and outlet of the heat exchange tube are respectively connected to the heat exchange box.

[0008] Preferably, the purification mechanism includes a purification box mounted on the second support. The air inlet of the purification box is connected to the exhaust port of the air inlet pipe. A partition plate is provided inside the purification box, dividing the purification box into a liquid storage chamber and a purification chamber. Multiple nozzles are provided on the partition plate, and the nozzles are connected to the liquid storage chamber. The bottom surface of the purification box is inclined, and a drain outlet is provided at the bottom of the purification box. A waste liquid tank is provided below the purification box, and the drain outlet and the waste liquid tank are connected through a delivery pipe. A one-way valve is provided at the drain outlet.

[0009] Preferably, the smoke exhaust mechanism includes a smoke exhaust pipe, which is inclinedly disposed on the outer wall of the purification box. A third bracket is disposed at the bottom of the smoke exhaust pipe. The air inlet of the smoke exhaust pipe is connected to the exhaust outlet of the purification box. A retaining plate is disposed between the outer wall of the purification box and the third bracket at the bottom of the smoke exhaust pipe. A second filter plate and a third filter plate are vertically inserted into the smoke exhaust pipe. The bottom of the second filter plate and the bottom of the third filter plate are respectively inserted into the retaining plate. A second insertion hole and a third insertion hole are respectively opened at the bottom of the second filter plate and the lower part of the third filter plate. A second locking plate is horizontally inserted into the second insertion hole and the third insertion hole. The second locking plate abuts against the top of the retaining plate.

[0010] Preferably, a motor is installed at the top of the exhaust pipe, a first rotating wheel is installed at the drive end of the motor, a sealing box is installed inside the exhaust pipe, an avoidance opening is provided on the exhaust pipe at the top of the sealing box, a driven shaft is rotatably installed inside the sealing box, a second rotating wheel is coaxially installed on the driven shaft, the first rotating wheel and the second rotating wheel are connected by a transmission belt, the transmission belt passes through the avoidance opening, a fan blade is provided at one end of the driven shaft that extends through the sealing box, and a sealed bearing is provided between the driven shaft and the sealing box.

[0011] Preferably, the speed detection module one is used to measure the rotational speed of the first rotating wheel;

[0012] Speed ​​detection module two is used to measure the rotational speed of the second rotating wheel;

[0013] The time detection module is used to measure the actual working time of the motor;

[0014] Calculation module one is used to calculate the actual safe power coefficient of the motor based on the rotational speed of the first rotating wheel;

[0015] The alarm module is used to issue alarms;

[0016] The processing module is used to compare the actual safe power coefficient of the motor obtained by the calculation module with the preset safe power coefficient of the motor.

[0017] The control module will issue an alarm and stop the flue gas purification system when the actual safe power factor of the motor is greater than the preset safe power factor. When the actual safe power factor of the motor is less than or equal to the preset safe power factor, the flue gas purification system will work normally.

[0018] Preferably, the calculation module one calculates based on the following formula:

[0019] ;

[0020] This is the actual safety power factor of the motor. Pi The radius of the first rotating wheel, The radius of the second rotating wheel, The rotational speed of the first rotating wheel, The rotational speed of the second rotating wheel, The density of the flue gas, This refers to the mechanical transmission efficiency of the transmission belt. For flow coefficient, This refers to the rated power of the motor. It is a sine function. The angle between the axis of the exhaust pipe and the horizontal direction. The number of blades on the fan blades. This refers to the actual operating time of the motor. This is the acceleration due to gravity. Beneficial effects

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] Multiple first supports provide support and fixation for the condensation mechanism, purification mechanism, and flue gas exhaust mechanism. During the power generation process, the flue gas containing harmful substances enters the condensation mechanism for condensation and cooling, and the heat in the flue gas is collected, transferred, and reused, saving thermal energy. After cooling, the flue gas enters the purification mechanism to purify and eliminate some of the harmful substances in the flue gas. The flue gas after the harmful substances have been purified is sucked away by the flue gas exhaust mechanism, filtered, and then discharged. This achieves the simultaneous utilization of waste heat from the flue gas and purification of harmful substances in the flue gas, preventing the discharge of flue gas from causing serious environmental pollution. Attached Figure Description

[0023] 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 is a schematic diagram of the overall structure provided in an embodiment of the present invention;

[0025] Figure 2 is a schematic cross-sectional structure provided in an embodiment of the present invention.

[0026] Figure label:

[0027] 1. First support; 11. Second support; 12. Third support; 2. Condensation mechanism; 21. Air inlet pipe; 22. First filter plate; 221. First insertion hole; 23. First locking plate; 24. Heat exchange box; 25. Heat exchange tube; 3. Purification mechanism; 31. Purification box; 32. Divider plate; 33. Liquid storage chamber; 34. Purification chamber; 35. Nozzle; 36. Leakage port; 37. Waste liquid tank; 38. Infusion pipe; 39. 4. One-way valve; 5. Smoke exhaust mechanism; 6. Smoke exhaust pipe; 7. Clearance opening; 8. Clamping plate; 9. Second filter plate; 10. Second insertion hole; 11. Third filter plate; 2. Third insertion hole; 3. Second locking plate; 42. Motor; 5. First rotating wheel; 6. Sealing box; 7. Driven shaft; 8. Second rotating wheel; 9. Drive belt; 10. Fan blade; 11. Sealed bearing. Embodiments of the present invention

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0029] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0030] The present invention provides the following embodiments.

[0031] Example 1

[0032] This invention provides a flue gas purification system for a thermal power plant, as shown in Figures 1-2, comprising: a first support 1, a condensation mechanism 2 disposed on the first support 1, a purification mechanism 3 disposed on a second support 11, and a smoke exhaust mechanism 4 disposed on a third support 12, wherein the condensation mechanism 2 and the smoke exhaust mechanism 4 are respectively disposed on both sides of the purification mechanism 3.

[0033] The working principle and beneficial effects of the above technical solution are as follows: The first support 1, the second support 11, and the third support 12 respectively support and fix the condensing mechanism 2, the purification mechanism 3, and the exhaust mechanism 4. During the power generation process, the flue gas containing harmful substances enters the condensing mechanism 2 for condensation and cooling, and the heat in the flue gas is collected, transferred, and reused, saving thermal energy. After cooling, the flue gas enters the purification mechanism 3 to purify and eliminate some of the harmful substances in the flue gas. The flue gas after the harmful substances have been purified and eliminated is sucked away by the exhaust mechanism 4 and filtered before being discharged. This achieves the simultaneous utilization of the waste heat of the flue gas and the purification of harmful substances in the flue gas, preventing the discharge of flue gas from causing serious environmental pollution.

[0034] Example 2

[0035] Based on Embodiment 1, as shown in Figures 1-2, the condensation mechanism 2 includes an air inlet pipe 21, which is mounted on the first support 1. A first filter plate 22 is vertically inserted into the air inlet pipe 21, and a first insertion hole 221 is provided on the first filter plate 22. A first locking plate 23 is horizontally inserted into the first insertion hole 221, and the first locking plate 23 abuts against the top outer wall of the air inlet pipe 21. A heat exchange box 24 is provided below the air inlet pipe 21, and a heat exchange tube 25 is provided inside the pipe wall of the air inlet pipe 21. The inlet and outlet of the heat exchange tube 25 are respectively connected to the heat exchange box 24.

[0036] The working principle and beneficial effects of the above technical solution are as follows: The first bracket 1 supports and fixes the air intake pipe 21, and the air intake pipe 21 limits the first filter plate 22 in the horizontal direction. The first locking plate 23 fixes the first filter plate 22 and limits its vertical direction by inserting into the first insertion hole 221. When the first filter plate 22 needs to be replaced, the first filter plate 22 can be removed by pulling out the first locking plate 23 from the first insertion hole 221, which facilitates the installation and replacement of the first filter plate 22. The air intake pipe 21 fixes the heat exchange tube 25, and a part of the outer surface of the heat exchange tube 25 is exposed inside the air intake pipe 21, which increases the contact area between the outer surface of the heat exchange tube 25 and the smoke. The direct contact area between the air and the heat exchanger is such that the low-temperature liquid inside the heat exchanger 24 is injected into the heat exchanger tube 25. When the flue gas enters the inlet pipe 21, some of the dust and impurities in the flue gas are filtered by the first filter plate 22. The filtered flue gas comes into contact with the inner walls of the heat exchanger tube 25 and the inlet pipe 21. The heat in the flue gas is conducted to the inlet pipe 21 and the heat exchanger tube 25. The low-temperature liquid in the heat exchanger tube 25 carries away the heat conducted in, cooling and condensing the flue gas in the inlet pipe 21, preventing the heat in the flue gas from affecting the operation of subsequent equipment. The condensed liquid flows along the inner wall of the inlet pipe 21 into the purification mechanism 3 for treatment.

[0037] Example 3

[0038] Based on Embodiment 2, as shown in Figures 1-2, the purification mechanism 3 includes a purification box 31, which is mounted on the second support 11. The air inlet of the purification box 31 is connected to the exhaust port of the air inlet pipe 21. A partition plate 32 is provided inside the purification box 31, dividing the purification box 31 into a liquid storage chamber 33 and a purification chamber 34. Multiple nozzles 35 are provided on the partition plate 32, and the nozzles 35 are connected to the liquid storage chamber 33. The bottom surface of the purification box 31 is inclined, and a drain outlet 36 is provided at the bottom of the purification box 31. A waste liquid tank 37 is provided below the purification box 31. The drain outlet 36 and the waste liquid tank 37 are connected through a delivery pipe 38, and a one-way valve 39 is provided at the drain outlet 36.

[0039] The working principle and beneficial effects of the above technical solution are as follows: The second bracket 11 supports and fixes the purification box 31, the purification box 31 supports and fixes the partition plate 32, the liquid storage chamber 33 stores the purification liquid used to neutralize harmful substances in the flue gas, the partition plate 32 fixes multiple nozzles 35, the nozzles 35 spray the purification liquid in the form of a mist, the bottom of the purification box 31 and the waste liquid tank 37 fix and support the infusion pipe 38, the flue gas entering from the air inlet pipe 21 enters the purification box 31 and reacts with the mist purification liquid in the purification box 31, and the temperature of the flue gas is further reduced. The waste liquid and waste residue generated during neutralization fall downward into the bottom of the purification box 31, the inclined surface of the bottom of the purification box 31 guides the waste liquid and waste residue into the infusion pipe 38, the one-way valve 39 is opened, the waste liquid and waste residue fall downward into the waste liquid tank 37 for collection and treatment, and the neutralized flue gas is sucked away by the smoke exhaust mechanism 4.

[0040] Example 4

[0041] Based on Embodiment 3, as shown in Figures 1-2, the smoke exhaust mechanism 4 includes a smoke exhaust pipe 41, which is inclinedly disposed on the outer wall of the purification box 31. A third support 12 is disposed at the bottom of the smoke exhaust pipe 41. The air inlet of the smoke exhaust pipe 41 communicates with the exhaust outlet of the purification box 31. A retaining plate 42 is disposed between the outer wall of the purification box 31 and the third support 12 at the bottom of the smoke exhaust pipe 41. A second filter plate 43 and a third filter plate 44 are vertically inserted into the smoke exhaust pipe 41. The bottoms of the second filter plate 43 and the third filter plate 44 are respectively inserted into the retaining plate 42. A second insertion hole 431 and a third insertion hole 441 are respectively provided at the bottom of the second filter plate 43 and the lower part of the third filter plate 44. A second locking plate 45 is horizontally inserted inside the 1st chamber, and the second locking plate 45 abuts against the top of the clamping plate 42. A motor 46 is provided at the top of the exhaust pipe 41, and a first rotating wheel 47 is provided at the driving end of the motor 46. A sealing box 48 is provided inside the exhaust pipe 41, and an avoidance opening 411 is provided on the exhaust pipe 41 at the top of the sealing box 48. A driven shaft 481 is rotatably arranged inside the sealing box 48, and a second rotating wheel 482 is coaxially arranged on the driven shaft 481. The first rotating wheel 47 and the second rotating wheel 482 are connected by a transmission belt 483, which passes through the avoidance opening 411. A fan blade 484 is provided at one end of the driven shaft 481 that extends through the sealing box 48. A sealing bearing 485 is provided between the driven shaft 481 and the sealing box 48.

[0042] The working principle and beneficial effects of the above technical solution are as follows: The third bracket 12 supports and fixes the exhaust pipe 41; the outer wall of the purification box 31 and the bottom of the exhaust pipe 41 are fixed to the clamping plate 42; the exhaust pipe and the clamping plate 42 limit the second filter plate 43 and the third filter plate 44 in the horizontal direction; the second locking plate 45, inserted into the second insertion hole 431 and the third insertion hole 441, limits the second filter plate 43 and the third filter plate 44 in the vertical direction; when the second filter plate 43 and the third filter plate 44 need to be replaced, the second filter plate 43 and the third filter plate 44 can be removed by pulling out the second locking plate 45 from the second insertion hole 431 and the third insertion hole 441, which facilitates the installation and replacement of the second filter plate 43 and the third filter plate 44; the top of the exhaust pipe 41 supports and fixes the motor 46; the exhaust pipe 41 fixes the sealing box 48; the space inside the sealing box 48 is sealed to prevent… The flue gas flowing into the sealed box 48 corrodes the parts inside, affecting their lifespan. The drive end of the motor 46 drives the first rotating wheel 47 to rotate coaxially. The sealed box 48 limits the rotation of the driven shaft 481, which in turn fixes the second rotating wheel. The first rotating wheel 47 drives the second rotating wheel 482 to rotate synchronously via a conveyor belt. The second rotating wheel 482 drives the driven shaft 481 to rotate synchronously. The driven shaft 481 rotates synchronously within the sealed bearing 485. While assisting the rotation of the driven shaft 481, the sealed bearing 485 continues to seal the sealed box 48. The rotation of the driven shaft 481 drives the fan blade 484 to rotate. The rotation of the fan blade 484 generates suction to draw out the flue gas. The second filter plate 43 adsorbs the residual liquid in the flue gas, and the third filter plate 44 adsorbs the residual impurities in the flue gas. After further cleaning the harmful substances in the flue gas, it is discharged.

[0043] Example 5

[0044] Based on Example 4, it also includes:

[0045] Speed ​​detection module one is used to measure the rotational speed of the first rotating wheel 47;

[0046] Speed ​​detection module 2 is used to measure the rotational speed of the second rotating wheel 482;

[0047] The time detection module is used to measure the actual working time of motor 46;

[0048] Calculation module one is used to calculate the actual safe power coefficient of motor 46 based on the rotation speed of the first rotating wheel 47;

[0049] The alarm module is used to issue alarms;

[0050] The processing module is used to compare the actual safe power coefficient of motor 46 obtained by calculation module 1 with the preset safe power coefficient of motor 46.

[0051] The control module will issue an alarm when the actual safe power coefficient of motor 46 is greater than the preset safe power coefficient of motor 46, and at the same time control the flue gas purification system to stop working. When the actual safe power coefficient of motor 46 is less than or equal to the preset safe power coefficient of motor 46, the flue gas purification system will work normally.

[0052] The working principle and beneficial effects of the above technical solution are as follows: Speed ​​detection module one measures the rotational speed of the first rotating wheel 47, speed detection module two measures the rotational speed of the second rotating wheel 482, time detection module measures the actual working time of motor 46, calculation module one calculates the actual safe power coefficient of motor 46 based on the rotational speed of the first rotating wheel 47, alarm module is used to issue an alarm, and processing module compares the actual safe power coefficient of motor 46 obtained by calculation module one with the preset safe power coefficient of motor 46. When the actual safe power coefficient of motor 46 is greater than the preset safe power coefficient of motor 46, control module controls alarm module to issue an alarm and simultaneously controls flue gas purification system to stop working. When the actual safe power coefficient of motor 46 is less than or equal to the preset safe power coefficient of motor 46, flue gas purification system works normally.

[0053] Example 6

[0054] Based on Example 5, Calculation Module 1 calculates based on the following formula:

[0055] ;

[0056] This represents the actual safe power factor of motor 46. Pi The radius of the first rotating wheel 47, The radius of the second rotating wheel 482, The rotational speed of the first rotating wheel 47, The rotational speed of the second rotating wheel 482 The density of the flue gas, The mechanical transmission efficiency of the transmission belt 483. For flow coefficient, This is the rated power of motor 46. It is a sine function. The angle between the axis of the exhaust pipe 41 and the horizontal direction. This refers to the number of blades on fan blade 484. This refers to the actual working time of motor 46. This is the acceleration due to gravity.

[0057] The working principle and beneficial effects of the above technical solution are as follows: Through The actual safe power coefficient of motor 46 is calculated. When the actual safe power coefficient of motor 46 is greater than the preset safe power coefficient of motor 46, the control module controls the alarm module to issue an alarm and simultaneously controls the flue gas purification system to stop working. When the actual safe power coefficient of motor 46 is less than or equal to the preset safe power coefficient of motor 46, the flue gas purification system works normally.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flue gas purification system for thermal power plants, characterized in that, include: The first support (1) is provided with a condensing mechanism (2), the purification mechanism (3) is provided on the second support (11), and the smoke exhaust mechanism (4) is provided on the third support (12). The condensing mechanism (2) and the smoke exhaust mechanism (4) are respectively provided on both sides of the purification mechanism (3).

2. The flue gas purification system for thermal power plants according to claim 1, characterized in that, The condensation mechanism (2) includes an air inlet pipe (21), which is mounted on the first support (1). A first filter plate (22) is vertically inserted into the air inlet pipe (21). A first insertion hole (221) is opened on the first filter plate (22). A first locking plate (23) is horizontally inserted into the first insertion hole (221). The first locking plate (23) abuts against the top outer wall of the air inlet pipe (21). A heat exchange box (24) is provided below the air inlet pipe (21). A heat exchange tube (25) is provided inside the pipe wall of the air inlet pipe (21). The inlet and outlet of the heat exchange tube (25) are respectively connected to the heat exchange box (24).

3. The flue gas purification system for thermal power plants according to claim 2, characterized in that, The purification mechanism (3) includes a purification box (31), which is mounted on the second support (11). The air inlet of the purification box (31) is connected to the exhaust port of the air inlet pipe (21). A partition plate (32) is provided inside the purification box (31), which divides the purification box (31) into a liquid storage chamber (33) and a purification chamber (34). Multiple nozzles (35) are provided on the partition plate (32), which are connected to the liquid storage chamber (33). The bottom surface of the purification box (31) is inclined. A drain port (36) is provided at the bottom of the purification box (31). A waste liquid tank (37) is provided below the purification box (31). The drain port (36) and the waste liquid tank (37) are connected through a delivery pipe (38). A one-way valve (39) is provided at the drain port (36).

4. The flue gas purification system for thermal power plants according to claim 3, characterized in that, The smoke exhaust mechanism (4) includes a smoke exhaust pipe (41), which is inclinedly disposed on the outer wall of the purification box (31). The bottom of the smoke exhaust pipe (41) is provided with the third bracket (12). The air inlet of the smoke exhaust pipe (41) is connected to the exhaust outlet of the purification box (31). A retaining plate (42) is provided between the outer wall of the purification box (31) and the third bracket (12) at the bottom of the smoke exhaust pipe (41). A second filter plate (43) is vertically inserted into the smoke exhaust pipe (41). The bottom of the second filter plate (43) and the bottom of the third filter plate (44) are respectively inserted into the card plate (42). The bottom of the second filter plate (43) and the lower part of the third filter plate (44) are respectively provided with a second insertion hole (431) and a third insertion hole (441). A second locking plate (45) is horizontally inserted into the second insertion hole (431) and the third insertion hole (441). The second locking plate (45) abuts against the top of the card plate (42).

5. A flue gas purification system for thermal power plants according to claim 4, characterized in that, A motor (46) is provided at the top of the exhaust pipe (41). A first rotating wheel (47) is provided at the drive end of the motor (46). A sealing box (48) is provided inside the exhaust pipe (41). An avoidance opening (411) is provided on the exhaust pipe (41) at the top of the sealing box (48). A driven shaft (481) is rotatably provided inside the sealing box (48). A second rotating wheel (482) is coaxially provided on the driven shaft (481). The first rotating wheel (47) and the second rotating wheel (482) are connected by a transmission belt (483). The transmission belt (483) passes through the avoidance opening (411). A fan blade (484) is provided at one end of the driven shaft (481) that extends through the sealing box (48). A sealed bearing (485) is provided between the driven shaft (481) and the sealing box (48).

6. A flue gas purification system for thermal power plants according to claim 5, characterized in that, Also includes: Speed ​​detection module one is used to measure the rotational speed of the first rotating wheel (47); Speed ​​detection module 2 is used to measure the rotational speed of the second rotating wheel (482); The time detection module is used to measure the actual working time of the motor (46); Calculation module one is used to calculate the actual safe power coefficient of the motor (46) based on the rotation speed of the first rotating wheel (47); The alarm module is used to issue alarms; The processing module is used to compare the actual safe power coefficient of the motor (46) obtained by the calculation module with the preset safe power coefficient of the motor (46); The control module will issue an alarm when the actual safe power coefficient of the motor (46) is greater than the preset safe power coefficient of the motor (46), and at the same time control the flue gas purification system to stop working. When the actual safe power coefficient of the motor (46) is less than or equal to the preset safe power coefficient of the motor (46), the flue gas purification system will work normally.

7. A flue gas purification system for thermal power plants according to claim 6, characterized in that, Calculation Module 1 is based on the following formula: ； The actual safe power factor of the motor (46) Pi The radius of the first rotating wheel (47) is... The radius of the second rotating wheel (482) is... The rotational speed of the first rotating wheel (47) The rotational speed of the second rotating wheel (482) The density of the flue gas, For the mechanical transmission efficiency of the transmission belt (483), For flow coefficient, The rated power of the motor (46), It is a sine function. The angle between the axis of the exhaust pipe (41) and the horizontal direction. The number of blades on the fan blade (484), The actual working time of the motor (46), This is the acceleration due to gravity.

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