Coal-fired boiler for thermal power plant

Abstract

The invention relates to the technical field of coal-fired boilers, and provides a thermal power plant coal-fired boiler which comprises a crushing device, an air supply device and a boiler body, the crushing device comprises a conveying mechanism, a raw coal hopper and a coal mill, and the raw coal hopper is communicated with the coal mill and comprises a hopper body and a movable inner wall. The projection plane of the movable inner wall on the horizontal plane is of an annular structure, and the movable inner wall is rotationally connected into the bucket body. The hopper body comprises an upper hopper body and a lower hopper body, the movable inner wall is provided with a rotating wheel, the upper hopper body is provided with a feeding port, the lower hopper body is provided with a discharging pipe, the discharging pipe is communicated with the lower hopper body, the rotating wheel is rotationally connected between the upper hopper body and the hopper body, and a driving assembly used for driving the movable inner wall to rotate is arranged outside the hopper body and comprises a driving wheel and a driving motor. The rotating wheel is in linkage with the driving wheel, and the driving wheel is in linkage with an output shaft of the driving motor. By means of the technical scheme, the problems that in the prior art, an adhesion layer appears in a raw coal hopper, the raw material hopper is blocked, and normal work of a coal-fired boiler is affected are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal-fired boilers, and in particular to a coal-fired boiler in a thermal power plant. Background Art

[0002] Coal-fired boilers in thermal power plants generally refer to coal-fired boilers used in thermal power plants. Their working principle is mainly to generate heat energy by burning coal, transfer the heat energy through the water circulation system and convert it into steam, and finally drive the generator to generate electricity. The whole process involves multiple links such as combustion, heat transfer, vaporization, steam drive and flue gas treatment, each of which is crucial and coordinated with each other.

[0003] At present, in order to ensure combustion efficiency, coal-fired boilers in thermal power plants usually choose pulverized coal as fuel; since pulverized coal is not easy to transport due to its special powdery structure, most coal-fired boilers are equipped with crushing mechanisms such as raw coal hoppers and coal mills, so that the pulverized coal fuel of the coal-fired boiler enters the coal-fired boiler in the form of coal blocks that are easy to transport, and then is crushed and ground into coal powder, avoiding unnecessary loss of fuel during transportation and reducing power generation costs.

[0004] However, when the coal blocks pass through the raw coal hopper and enter the coal mill, they need to flow in the raw coal hopper. When the coal blocks flow in the hopper, they will be affected by the friction with the hopper wall, which will easily cause local wear and deposition of coal powder, thus causing an adhesion layer inside the raw coal hopper. As the adhesion layer gradually accumulates, it will gradually reduce the internal space of the raw coal hopper, increase the probability of blockage inside the raw coal hopper, and thus affect the normal operation of the coal-fired boiler. Summary of the invention

[0005] The present invention provides a coal-fired boiler for a thermal power plant, which solves the problem in the related art that an adhesion layer appears inside a raw coal hopper, causing the raw material hopper to be blocked and affecting the normal operation of the coal-fired boiler.

[0006] The technical solution of the present invention is as follows:

[0007] A coal-fired boiler in a thermal power plant comprises a crushing device, an air supply device, and a furnace body. The crushing device comprises a conveying mechanism, a raw coal hopper, and a coal mill. The raw coal hopper is communicated with the coal mill. The raw coal hopper comprises a hopper body and a movable inner wall. The projection of the movable inner wall on the horizontal plane is an annular structure, and the movable inner wall is rotatably connected to the inside of the hopper body; the hopper body comprises an upper hopper body and a lower hopper body, the movable inner wall has a rotating wheel, the upper hopper body has a material inlet, the lower hopper body has a material drop pipe, the material drop pipe is communicated with the lower hopper body, the rotating wheel is rotatably connected between the upper hopper body and the lower hopper body, the outside of the hopper body has a driving component for driving the movable inner wall to rotate, the driving component comprises a driving wheel and a driving motor, the rotating wheel is linked with the driving wheel, and the driving wheel is linked with the output shaft of the driving motor.

[0008] Furthermore, the upper bucket body has a rotating groove, the lower bucket body has a supporting step, the two ends of the movable inner wall are respectively rotatably connected in the rotating groove and the supporting step, the projection surface of the supporting step on the horizontal plane is an annular structure, and the inner ring diameter of the supporting step is equal to the inner ring diameter of the movable inner wall.

[0009] Furthermore, a plurality of scraping strips are arranged inside the bucket body, and two ends of each scraping strip are respectively fixedly connected to the lower bucket body and the upper bucket body, and each scraping strip is evenly distributed around the circumference of the blanking tube, and each scraping strip abuts against the inner ring of the movable inner wall.

[0010] Furthermore, the raw coal hoppers and coal mills are provided in plurality, each raw coal hopper corresponds to each coal mill one by one, and a distribution mechanism is provided between the conveying mechanism and each raw coal hopper.

[0011] Furthermore, the distribution mechanism includes a distribution bin and a plurality of guide plates, each of the guide plates corresponds to each raw coal hopper one by one, each of the guide plates is slidably connected to the distribution bin, and the distribution bin is provided with a plurality of lifting rods for controlling the lifting of each guide plate; the conveying mechanism includes a conveying path and a conveying bracket, the conveying bracket includes a first bracket and a second bracket, the second bracket is located in the distribution bin, and the highest horizontal height of the conveying path is greater than or equal to the highest horizontal height of the second bracket.

[0012] Furthermore, the distribution bin is provided with a plurality of connecting grooves, and each of the connecting grooves corresponds one by one to each guide plate and each feed opening of the raw coal hopper.

[0013] Furthermore, the drop pipe is provided with an anti-blocking rod, the anti-blocking rod is provided with anti-blocking blades, the anti-blocking blades are spirally wound on the anti-blocking rod, and the anti-blocking rod is linked to the movable inner wall.

[0014] Furthermore, the top end of the anti-blocking rod is higher than the bottom end of the movable inner wall, and the top end of the anti-blocking rod has a guide body, the guide body is a conical structure, and the diameter of the end of the guide body close to the anti-blocking rod is larger than the diameter of the end of the guide body away from the anti-blocking rod.

[0015] Furthermore, there are a plurality of linkage rods between the anti-blocking rod and the movable inner wall, and the linkage rods are evenly distributed around the anti-blocking rod. The longitudinal section of each linkage rod is a rectangular structure, and each surface of each linkage rod has an angle with the horizontal plane.

[0016] Furthermore, the movable interior is provided with a connecting ring, and each of the scraper strips includes a first strip body and a second strip body, and the connecting ring is located between the first strip body and the second strip body, and both ends of each of the first strip bodies are respectively fixedly connected to the upper bucket body and the sliding connection ring, and both ends of each of the second strip bodies are respectively fixedly connected to the lower bucket body and the sliding connection ring, and both ends of each of the linkage rods are respectively fixedly connected to the anti-blocking rod and the connecting ring.

[0017] The working principle and beneficial effects of the present invention are:

[0018] 1. The present invention mainly includes a crushing device, an air supply device, and a furnace body, that is, the air supply device sends the coal powder crushed by the crushing device into the furnace body for coal heating. Among them, the crushing device mainly includes a conveying mechanism, a raw coal hopper, and a coal mill. The raw coal hopper is connected to the coal mill, that is, the coal blocks in the present invention are conveyed by the conveying mechanism through the raw coal hopper into the coal mill to be crushed, crushed, and ground into coal powder.

[0019] 2. The raw coal hopper in the present invention mainly includes a hopper body and a movable inner wall. The movable inner wall is rotatably connected to the inside of the hopper body. Compared with the inner wall in a fixed state, the inner wall in a rotating state can effectively reduce the time that the coal blocks inside the hopper body adhere to its surface; and the rotating movable inner wall can also drive the coal materials inside the hopper body to move through its own rotational motion, effectively preventing the coal materials from staying at a certain place on the inner wall for a long time, resulting in the accumulation of coal materials on the inner wall into an adhesion layer. This avoids the blockage of coal materials caused by the reduction of the effective space inside the hopper body over time, and ensures that the coal materials can normally enter the furnace body for coal heating.

[0020] 3. The bucket body in the present invention mainly includes an upper bucket body and a lower bucket body, and a rotating wheel is provided on the movable inner wall, and the rotating wheel is rotatably connected between the upper bucket body and the lower bucket body; and a driving component for driving the movable inner wall is provided outside the bucket body, and the driving component mainly includes a driving wheel and a driving motor, and the rotating wheel is linked to the driving wheel, and the driving wheel is linked to the output shaft of the driving motor, that is, the rotation of the movable inner wall is controlled by the driving motor, so that the movable inner wall can be controlled to rotate by electronic control, which is convenient for the use of the present invention; and the driving parts such as the driving motor are all located outside the bucket body, which effectively saves the internal space of the bucket body, which not only ensures the internal capacity of the bucket body, but also prevents the inside of the bucket body from being blocked due to the existence of the driving component. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Figure 1 It is a schematic diagram of the structure of the actual application of Example 1, Example 2 or Example 3;

[0023] Figure 2 for Figure 1 A partial enlarged view of the middle part;

[0024] Figure 3 It is a schematic diagram of the coordination between the distribution mechanism and the conveying mechanism in Example 1, Example 2 or Example 3;

[0025] Figure 4It is an axonometric view of Example 1, Example 2, or Example 3;

[0026] Figure 5 for Figure 4 A partial enlarged view of point B in the middle;

[0027] Figure 6 This is a schematic diagram of the structure of the raw coal hopper in Example 1;

[0028] Figure 7 for Figure 6 A cross-sectional view of

[0029] Figure 8 is a cross-sectional view of the raw coal hopper in Example 2;

[0030] Fig. 9 This is a cross-sectional view of the raw coal hopper in Example 3.

[0031] In the figure:

[0032] 1. Crushing device; 2. Conveying mechanism; 21. Conveying road; 22. Conveying support; 221. First support; 222. Second support; 3. Raw coal bucket; 31. Bucket body; 311. Upper bucket body; 3111. Rotating chute; 312. Lower bucket body; 3121. Supporting step; 313. Feeding port; 314. Dropping pipe; 315. Scraping strip; 3151. First strip body; 3152. Second strip body; 32. Movable inner wall; 321. Rotating wheel; 4. Coal mill; 5. Driving assembly; 51. Driving wheel; 52. Driving motor; 6. Distribution mechanism; 61. Distribution bin; 611. Connecting groove; 62. Guide plate; 63. Lifting rod; 7. Anti-blocking rod; 71. Anti-blocking blade; 72. Guide body; 81. Connecting ring; 82. Linking rod. DETAILED DESCRIPTION

[0033] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1

[0035] like Figure 1-2As shown, this embodiment proposes a coal-fired boiler in a thermal power plant, which mainly includes a crushing device 1, an air supply device, and a furnace body. The crushing device 1 includes a conveying mechanism 2, a raw coal hopper 3, and a coal mill 4. The raw coal hopper 3 is connected to the coal mill 4, that is, the coal material for combustion enters the coal mill 4 through the raw coal hopper 3 with the help of the conveying action of the conveying mechanism 2 to be crushed, crushed, and ground into coal powder. The primary air sent into the furnace body by the air supply device enters the furnace body through the burner, and the primary air for conveying the coal powder is taken from the atmosphere with the help of the fan in the air supply device.

[0036] The raw coal hopper 3 includes a hopper body 31 and a movable inner wall 32. The movable inner wall 32 has a ring-shaped structure when projected on a horizontal plane, i.e., the movable inner wall 32 replaces the inner cavity of the hopper body 31 in this embodiment to contact the coal material entering the hopper body 31, and the movable inner wall 32 is rotatably connected to the inside of the hopper body 31.

[0037] like Figure 2 , Figure 6 As shown, the bucket body 31 in this embodiment includes an upper bucket body 311 and a lower bucket body 312, the movable inner wall 32 has a rotating wheel 321, the upper bucket body 311 has a material inlet 313, and the lower bucket body 312 has a material drop pipe 314, the material drop pipe 314 is connected to the lower bucket body 312 and the coal mill 4, that is, the coal material inside the bucket body 31 enters the coal mill 4 through the material drop pipe 314. The bucket body 31 has a driving assembly 5 for driving the movable inner wall 32 to rotate outside, and the rotating wheel 321 is rotatably connected between the upper bucket body 311 and the lower bucket body 312 to prevent the existence of the upper bucket body 311 and the lower bucket body 312 from interfering with the driving process of the driving assembly 5 driving the movable inner wall 32 to rotate. The driving assembly 5 includes a driving wheel 51 and a driving motor 52, the rotating wheel 321 is linked with the driving wheel 51, and the driving wheel 51 is linked with the output shaft of the driving motor 52. That is, the rotation of the movable inner wall 32 is controlled by the driving motor 52, so that the movable inner wall 32 can be controlled to rotate by electronic control, which is convenient for the use of this embodiment; and the rotating wheel 321 and the driving wheel 51 in this embodiment are preferably gears, that is, the linkage between the rotating wheel 321 and the driving wheel 51 is achieved by the meshing of the two, which fully guarantees the transmission efficiency between the two, and the gear transmission can withstand a large load, which can effectively ensure the stability and reliability of the drive component 5 in this embodiment.

[0038] At the same time, the driving components 5 such as the driving motor 52 and the driving wheel 51 are all located outside the bucket body 31, which effectively saves the internal space of the bucket body 31, ensures the internal capacity of the bucket body 31, and prevents the bucket body 31 from being blocked due to the existence of the driving components 5.

[0039] Compared with the inner cavity of the bucket body 31 in a fixed state, the movable inner wall 32 in a rotating state controlled by the driving motor 52 can effectively reduce the time that the coal material inside the bucket body 31 adheres to its surface; and the rotating movable inner wall 32 can also drive the coal material inside the bucket body 31 to move through its own rotational motion, effectively preventing the coal material from staying at a certain place of the movable inner wall 32 for a long time, resulting in the accumulation of coal material on the movable inner wall 32 to form an adhesion layer. This avoids the blockage of coal material caused by the reduction of the effective space inside the bucket body 31 over time, and ensures that the coal material can normally enter the furnace body for coal heating.

[0040] The driving motor 52 in this embodiment is preferably an asynchronous motor or other motor with high power output, to ensure that the driving assembly 5 in this embodiment has sufficient power to drive the movable inner wall 32 to rotate.

[0041] like Figure 7 As shown, the upper bucket body 311 in this embodiment has a rotation groove 3111, and the lower bucket body 312 has a support step 3121. The two ends of the movable inner wall 32 are respectively rotatably connected in the rotation groove 3111 and on the support step 3121, that is, the movable inner wall 32 is rotatably connected in the rotation groove 3111 in an embedded connection manner, so that the rotation groove 3111 can restrain the movable inner wall 32, preventing the movable inner wall 32 from shaking left and right during the rotation process; and the support step 3121 plays a role in supporting the movable inner wall 32. Through the mutual cooperation of the two, the stability of the movable inner wall 32 in the bucket body 31 is fully guaranteed. The projection surface of the support step 3121 on the horizontal plane is an annular structure, and the inner ring diameter of the support step 3121 is equal to the inner ring diameter of the movable inner wall 32, so as to prevent the presence of a gap step between the movable inner wall 32 and the support step 3121, so that the coal material in the bucket body 31 is easily left on the support step 3121, affecting the normal transportation of the coal material.

[0042] In order to further prevent the coal material from adhering to the movable inner wall 32, a plurality of scraping strips 315 are provided inside the bucket body 31. The two ends of each scraping strip 315 are respectively fixedly connected to the lower bucket body 312 and the upper bucket body 311. With the help of the scraping strips 315, the upper bucket body 311 and the lower bucket body 312 are connected, so that the overall structure of the bucket body 31 is more stable; and each scraping strip 315 is in contact with the inner ring of the movable inner wall 32. That is, the side of each scraping strip 315 close to the movable inner wall 32 is in contact with the movable inner wall 32, so that when the movable inner wall 32 rotates, the scraping strip 315 can scrape off the coal material adhering to the movable inner wall 32, so that the movable inner wall 32 has a self-cleaning function. At the same time, each scraping strip 315 is evenly distributed around the drop pipe 314 in a circumference to ensure the scraping efficiency of the coal material on the movable inner wall 32.

[0043] like Figure 2-3 , Figure 5As shown, the raw coal hoppers 3 and coal mills 4 in this embodiment are each provided with a plurality of raw coal hoppers 3, that is, the raw coal hoppers 3 and coal mills 4 are designed redundantly, and each raw coal hopper 3 corresponds to each coal mill 4 one by one, so that when a failure occurs in any one of the raw coal hoppers 3 or coal mills 4, it will not affect the normal use of this embodiment, thereby ensuring the reliability of the operation of this embodiment; there is a distribution mechanism 6 between the conveying mechanism 2 and each raw coal hopper 3, and the distribution mechanism 6 is used to specify the coal material to enter any one group of raw coal hoppers 3 and coal mills 4, so that the staff can adjust the coal material entry situation of each group of raw coal hoppers 3 and coal mills 4 according to the actual working conditions of each group of raw coal hoppers 3 and coal mills 4 (whether they are damaged), so as to avoid that there is still coal material entering the raw coal hoppers 3 and coal mills 4 that have failed, and to avoid that the coal material is accumulated in the damaged raw coal hoppers 3 and coal mills 4, which affects the normal coal supply work of the crushing device 1 to the furnace body.

[0044] The conveying mechanism 2 includes a conveying path 21 and a conveying support 22. The conveying support 22 includes a first support 221 and a second support 222. The second support 222 and the first support 221 both play the role of supporting the conveying path 21. The conveying path 21 in this embodiment preferably mainly includes a belt, a motor, a plurality of pulleys, a belt conveying structure of a transmission shaft, etc., which is suitable for long-distance, large-capacity material conveying structures, so as to ensure the conveying efficiency of the coal material in this embodiment. The distribution mechanism 6 mainly includes a distribution bin 61 and a plurality of guide plates 62. Each guide plate 62 corresponds to each raw coal hopper 3 one by one. Each raw coal hopper 3 is connected to the distribution bin 61. The second bracket 222 is located in the distribution bin 61. Each guide plate 62 is slidably connected to the distribution bin 61, and each guide plate 62 is tilted on the conveying path 21 so as to introduce the coal material on the conveying path 21 into the corresponding raw coal hopper 3. The distribution bin 61 is provided with a plurality of lifting rods 63 for controlling the lifting of each guide plate 62. That is, the distribution mechanism 6 in this embodiment controls the lifting of the guide plate 62 by the lifting rod 63, so that the guide plate 62 cuts off the conveying path of the conveying path 21 to convey the coal material, and uses the tilted guide plate 62 and the conveying path 21 that still maintains the conveying function to change the moving direction of the coal material that contacts the guide plate 62 under the conveying function of the conveying path 21, so that the coal material enters the corresponding raw coal hopper 3, completing the distribution work to be performed by the distribution mechanism 6. The lifting rod 63 in this embodiment is preferably a hydraulic lifting rod to ensure that it has sufficient force to lift the guide plate 62 .

[0045] The highest horizontal height of the conveyor path 21 is greater than or equal to the highest horizontal height of the second bracket 222, so as to prevent the second bracket 222 supporting the conveyor path 21 from interfering with the distribution of coal materials and ensure the reliability of the operation of the distribution mechanism 6 in this embodiment. If necessary, the top end (the highest end) of the second bracket 222 can be tilted so that the horizontal height of the end of the second bracket 222 close to the conveyor path 21 is higher than the horizontal high end of the end of the second bracket 222 away from the conveyor path 21, so that the coal materials in the distribution process can be better moved through the second bracket 222 into the corresponding raw coal hopper 3, so as to ensure the stability of the distribution work of the distribution mechanism 6.

[0046] The distribution bin 61 is provided with a plurality of connecting grooves 611, and each connecting groove 611 is located correspondingly to each guide plate 62 and the feed port 313 of each raw coal hopper 3, so that a feed channel is provided above the feed port 313, so that the distributed coal material can accurately enter the corresponding raw coal hopper 3 through the guiding effect of each guide plate 62, and will not fall into the feed port 313 accurately due to inertia or the like, but fall on the bottom of the distribution bin 61 instead, resulting in coal accumulation, thereby ensuring the coal material transportation efficiency in this embodiment.

[0047] Example 2

[0048] On the basis of Example 1, and different from Example 1, this example proposes:

[0049] Considering that when conveying coal materials with high humidity, coal blocks and other coal materials are prone to stick to each other, causing the coal materials to be easily blocked in the places with narrow flow areas such as the drop pipe 314, therefore, Figure 8 As shown, the material drop pipe 314 in this embodiment has an anti-blocking rod 7, and the anti-blocking rod 7 has an anti-blocking blade 71, which is spirally wound on the anti-blocking rod 7. The anti-blocking blade 71 controls the amount of coal material passing through the material drop pipe 314 at one time, so as to limit the amount of coal material to avoid blockage in the material drop pipe 314, thereby ensuring the stability of the raw coal hopper 3 when transporting coal materials with high humidity. The anti-blocking rod 7 is linked with the movable inner wall 32, so that the present embodiment does not need to design an additional independent driving element, saving energy consumption during the operation of the present embodiment.

[0050] The top of the anti-blocking rod 7 is higher than the bottom of the movable inner wall 32, so that the inside of the bucket body 31 is within the rotation range of the anti-blocking rod 7 and the movable inner wall 32, thereby ensuring the smoothness of the transportation of coal materials inside the bucket body 31. The top of the anti-blocking rod 7 has a guide body 72, which is a conical structure. The diameter of the end of the guide body 72 close to the anti-blocking rod 7 is larger than the diameter of the end of the guide body 72 away from the anti-blocking rod 7, so as to prevent the coal materials entering the bucket body 31 from the feed port 313 from accumulating on the top of the anti-blocking rod 7.

[0051] There are a number of linkage rods 82 between the anti-blocking rod 7 and the movable inner wall 32. The linkage rods 82 are evenly distributed around the anti-blocking rod 7. The two ends of each linkage rod 82 are respectively fixedly connected to the movable inner wall 32 and the anti-blocking rod 7. With the fixed connection between the two, the anti-blocking rod 7 can rotate with the rotation of the movable inner wall 32. The longitudinal section of each linkage rod 82 is a rectangular structure, and each surface of each linkage rod 82 has an angle with the horizontal plane, that is, the longitudinal section of the linkage rod 82 is an inclined rectangular structure, which effectively prevents coal materials from accumulating on the linkage rod 82.

[0052] In addition, the horizontal height of the top end of the anti-blocking rod 7 should be higher than or equal to the horizontal height of the top end of the rotating wheel 321, and the rotating wheel 321 and each linkage rod 82 should be kept flush, so that the linkage between the movable inner wall 32 and the anti-blocking rod 7 can be achieved with a relatively short linkage force arm, which helps to ensure the stability of the linkage of the anti-blocking rod 7.

[0053] Example 3

[0054] Based on Example 1 and Example 2, this example proposes:

[0055] like Fig. 9 As shown, the movable inner part has a connecting ring 81, each scraper 315 includes a first strip body 3151 and a second strip body 3152, the connecting ring 81 is located between the first strip body 3151 and the second strip body 3152, and the two ends of each linkage rod 82 are respectively fixedly connected to the anti-blocking rod 7 and the connecting ring 81, that is, the connecting ring 81 is used to prevent the linkage rod 82 from interfering with each scraper 315 during the process of rotating with the movable inner wall 32, so that this embodiment can have both the scraper 315 in Example 1 and the anti-blocking rod 7 in Example 2, so that this embodiment can be used for both dry coal materials and wet coal materials, and fully ensure the practicality of this embodiment;

[0056] Both ends of each first strip 3151 are respectively fixedly connected to the upper bucket body 311 and the sliding connection ring 81, and both ends of each second strip 3152 are respectively fixedly connected to the lower bucket body 312 and the sliding connection ring 81, so that both ends of the first strip 3151 and the second strip 3152 have support points inside the bucket body 31, thereby ensuring the connection stability of the first strip 3151 and the second strip 3152 inside the bucket body 31.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coal-fired boiler in a thermal power plant, comprising a crushing device (1), an air supply device, and a furnace body, wherein the crushing device (1) comprises a conveying mechanism (2), a raw coal hopper (3), and a coal mill (4), wherein the raw coal hopper (3) is in communication with the coal mill (4), and wherein: The raw coal hopper (3) comprises a hopper body (31) and a movable inner wall (32); the projection surface of the movable inner wall (32) on the horizontal plane is an annular structure, and the movable inner wall (32) is rotatably connected to the inside of the hopper body (31); The bucket body (31) comprises an upper bucket body (311) and a lower bucket body (312); the movable inner wall (32) has a rotating wheel (321); the upper bucket body (311) has a material inlet (313); the lower bucket body (312) has a material drop pipe (314); the material drop pipe (314) is connected to the lower bucket body (312); the rotating wheel (321) is rotatably connected between the upper bucket body (311) and the lower bucket body (312); the bucket body (31) has a driving assembly (5) for driving the movable inner wall (32) to rotate outside; the driving assembly (5) comprises a driving wheel (51) and a driving motor (52); the rotating wheel (321) is linked to the driving wheel (51); and the driving wheel (51) is linked to the output shaft of the driving motor (52).

2. The coal-fired boiler of a thermal power plant according to claim 1, characterized in that: The upper bucket body (311) has a rotation groove (3111), the lower bucket body (312) has a supporting step (3121), and the two ends of the movable inner wall (32) are rotatably connected to the rotation groove (3111) and the supporting step (3121), respectively. The projection surface of the supporting step (3121) on the horizontal plane is an annular structure, and the inner ring diameter of the supporting step (3121) is equal to the inner ring diameter of the movable inner wall (32).

3. The coal-fired boiler of a thermal power plant according to claim 1, characterized in that: A plurality of scraping strips (315) are arranged inside the bucket body (31), and two ends of each scraping strip (315) are respectively fixedly connected to the lower bucket body (312) and the upper bucket body (311). Each scraping strip (315) is evenly distributed around the drop tube (314) in a circumference, and each scraping strip (315) abuts against the inner ring of the movable inner wall (32).

4. The coal-fired boiler of a thermal power plant according to claim 1, characterized in that: The raw coal hopper (3) and the coal mill (4) are both provided in plurality, and each raw coal hopper (3) corresponds to each coal mill (4) one by one. A distribution mechanism (6) is provided between the conveying mechanism (2) and each raw coal hopper (3).

5. The coal-fired boiler of a thermal power plant according to claim 4, characterized in that: The distribution mechanism (6) comprises a distribution bin (61) and a plurality of guide plates (62), each of the guide plates (62) corresponding to each raw coal hopper (3), each of the guide plates (62) being slidably connected to the distribution bin (61), and a plurality of lifting rods (63) for controlling the lifting of each guide plate (62) are provided on the distribution bin (61); The conveying mechanism (2) comprises a conveying path (21) and a conveying support (22); the conveying support (22) comprises a first support (221) and a second support (222); the second support (222) is located in a distribution bin (61); and the highest level of the conveying path (21) is greater than or equal to the highest level of the second support (222).

6. The coal-fired boiler of a thermal power plant according to claim 4, characterized in that: The distribution bin (61) has a plurality of connecting grooves (611), and each of the connecting grooves (611) corresponds one by one to each of the guide plates (62) and the feed openings (313) of each raw coal hopper (3).

7. The coal-fired boiler of a thermal power plant according to claim 1 or 3, characterized in that: The drop pipe (314) is provided with an anti-blocking rod (7), the anti-blocking rod (7) is provided with an anti-blocking blade (71), the anti-blocking blade (71) is spirally wound on the anti-blocking rod (7), and the anti-blocking rod (7) is linked to the movable inner wall (32).

8. The coal-fired boiler of a thermal power plant according to claim 7, characterized in that: The top end of the anti-blocking rod (7) is higher than the bottom end of the movable inner wall (32), and the top end of the anti-blocking rod (7) is provided with a guide body (72). The guide body (72) is a conical structure, and the diameter of the end of the guide body (72) close to the anti-blocking rod (7) is larger than the diameter of the end of the guide body (72) away from the anti-blocking rod (7).

9. The coal-fired boiler of a thermal power plant according to claim 7, characterized in that: A plurality of linkage rods (82) are provided between the anti-blocking rod (7) and the movable inner wall (32), and the linkage rods (82) are evenly distributed around the anti-blocking rod (7). The longitudinal section of each linkage rod (82) is a rectangular structure, and each surface of each linkage rod (82) has an angle with a horizontal plane.

10. The coal-fired boiler of a thermal power plant according to claim 9, characterized in that: The movable inner part is provided with a connecting ring, each of the scraping strips (315) comprises a first strip body (3151) and a second strip body (3152), the connecting ring (81) is located between the first strip body (3151) and the second strip body (3152), the two ends of each of the first strip bodies (3151) are respectively fixedly connected to the upper bucket body (311) and the sliding connection ring (81), the two ends of each of the second strip bodies (3152) are respectively fixedly connected to the lower bucket body (312) and the sliding connection ring (81), and the two ends of each of the linkage rods (82) are respectively fixedly connected to the anti-blocking rod (7) and the connecting ring (81).

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