A coal powder drying system and drying method for thermal power plants

Abstract

The present invention discloses a coal powder drying system and drying method for a thermal power plant, belonging to the field of drying technology, comprising a vertical cylinder, wherein a conical barrel and two partition drying modules are arranged in sequence from bottom to top inside the vertical cylinder, wherein the partition drying module comprises a partition barrel, a grid plate, a flue gas heating box, a first flue gas release block and a second flue gas release block. In the present invention, the coal powder is first contacted and mixed with the high-temperature flue gas introduced from the flue gas inlet at the bottom of the vertical cylinder, the blocking processing module effectively crushes the rising coal blocks, the flue gas heating box heats the incoming flue gas, the first flue gas release block releases the heated flue gas downward from an upper position, and the second flue gas release block releases the heated flue gas upward from a lower position, so that the coal powder passing through the grid plate circulates inside the partition barrel and contacts with the heated flue gas, thereby prolonging the residence time of the coal powder in the drying area, allowing the coal powder to be discharged outward after multiple rounds of drying, thereby improving the drying efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of drying, and in particular to a coal powder drying system and a drying method for a thermal power plant. Background Art

[0002] The drying riser technology is used to improve the quality of coal powder before it is transported to the boiler. The coal powder is put into the drying vertical tube from the feed hopper at a high position on the surface of the drying vertical tube. The high-temperature flue gas is introduced from the flue gas inlet at the bottom of the drying vertical tube, so that the coal powder and the high-temperature flue gas are contacted and mixed in the drying vertical tube for drying. The input coal powder contacts the flue gas input from the bottom of the drying vertical tube. During the drying process, the coal powder gradually rises to different heights inside the drying vertical tube. The flue gas is always input from the flue gas inlet at the bottom of the drying vertical tube. The input position of the flue gas is fixed. The continuous input of coal powder will also affect the temperature and flow of the flue gas, resulting in insufficient contact time and reaction effect between the coal powder and the flue gas. At the same time, due to the humidity and temporary accumulation of coal powder in the bottom area of ​​the drying vertical tube, the coal powder entering the drying vertical tube and the rising coal powder will clump, and the drying of the clumps requires a longer contact reaction time. In the prior art, there is a method of adjusting the length and diameter of the drying shaft, and heating a specific area at the smoke inlet of the drying shaft according to the on-site conditions to minimize the temperature change in the drying shaft during the entire quality-improving drying process, so as to improve the drying effect of the coal powder. However, there are still differences in the rising state, speed and regional temperature of the coal powder at different heights in the drying shaft, so that the coal powder cannot have a long-term contact reaction with the smoke at a suitable temperature at different heights in the drying shaft, which affects the drying effect of the coal powder and the drying efficiency. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a coal powder drying system and drying method for a thermal power plant. Two independent coal powder drying areas are formed inside the vertical cylinder by arranging two upper and lower distributed separation drying modules. The coal powder is first contacted and mixed with the high-temperature flue gas introduced from the flue gas inlet at the bottom of the vertical cylinder to carry out the first round of drying. The blocking treatment module effectively crushes the rising coal blocks. Part of the dry coal powder rises and passes through the conical barrel into the first section of the separation barrel. The flue gas heating box heats the incoming flue gas. The first flue gas release block releases the heated flue gas from the upper position downward, and the second flue gas release block releases the heated flue gas from the lower position upward, so that the coal powder passing through the grid plate circulates inside the separation barrel and contacts with the heated flue gas, thereby extending the residence time of the coal powder in the drying area and allowing the coal powder to be discharged outward after multiple rounds of drying, thereby improving the drying efficiency, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A coal powder drying system for a thermal power plant comprises a vertical cylinder, wherein a conical barrel and two partition drying modules are arranged in sequence from bottom to top inside the vertical cylinder, wherein the partition drying module comprises a partition barrel, a grid plate, a flue gas heating box, a first flue gas release block and a second flue gas release block; a blocking processing module is arranged inside the conical barrel, wherein the blocking processing module comprises a flue gas guide shell, a cone head plate, a material blocking mesh shell and a corrugated expansion pipe, wherein the material blocking mesh shell is fixed at the bottom end of the conical barrel to block the rising coal powder, wherein the corrugated expansion pipe is extended by introducing flue gas from the flue gas guide shell, and the The bottom end of the corrugated extension tube pushes the cone head plate to descend inside the conical barrel and approach the material blocking mesh shell, and the cone head at the bottom of the cone head plate penetrates under the material blocking mesh shell to crush the coal blocks; a smoke diversion module is provided inside the vertical cylinder, and the smoke diversion module comprises a smoke guide box, a supporting orifice plate and a smoke guide frame, and the supporting orifice plate is positioned above the smoke inlet at the bottom end of the vertical cylinder through the smoke guide box, and the top of the smoke guide box is fixedly connected to three smoke guide frames, and the smoke guide frames guide the released smoke into the conical barrel and the separation and drying module.

[0006] Furthermore, the two smoke heating boxes are respectively fixedly connected to the bottom of the two grid plates, the first smoke release block is fixedly connected to the bottom of the grid plate at the upper position, the first smoke release block is connected to the output end of the corresponding smoke heating box, and an external partition net is fixedly connected to the surface of the first smoke release block.

[0007] Furthermore, there are two mesh plates and two smoke heating boxes, and the two mesh plates are fixed one above and one below inside the partition barrel and position the two smoke heating boxes on the outside of both ends of the partition barrel. The second smoke release block is positioned at the bottom of the mesh plate at the lower position through the smoke heating box at the lower position, and the first smoke release block is positioned at the bottom of the mesh plate at the upper position through the smoke heating box at the upper position, and the second smoke release block is connected to the output end of the smoke heating box at the lower position.

[0008] Furthermore, the two partition barrels distributed up and down are fixedly connected, and the bottom end of the partition barrel at the lower position is fixedly connected to the top end of the conical barrel.

[0009] Furthermore, the smoke guide shell is fixedly connected to the outer wall of the conical barrel, the cone head plate is slidably connected to the inside of the material blocking mesh shell, the corrugated extension tube is fixedly connected to the output end of the smoke guide shell, and the other end of the corrugated extension tube is fixedly connected to the top of the cone head plate.

[0010] Furthermore, the smoke guide box is fixedly connected to the inside of the vertical cylinder, the supporting hole plate is fixedly connected to the inside of the smoke guide box, the outer wall of the vertical cylinder is fixedly connected with a reinforcement ring, and the reinforcement ring is fixedly connected to the outer wall of the smoke guide box.

[0011] Furthermore, four connecting pipes are fixedly connected to the inner wall of the smoke guide frame, the other end of the connecting pipes is fixedly connected to the input end of the corresponding smoke heating box, and the outer wall of the smoke guide shell is fixedly connected to a vertical pipe, the other end of the vertical pipe is fixedly connected to the top of the smoke guide box.

[0012] Furthermore, a combination cylinder is provided on the outer side of the separation and drying module, and the inner side wall of the combination cylinder is fixedly connected to the grid plate and the separation cylinder.

[0013] Furthermore, the present invention also relates to a drying method for a pulverized coal drying system for a thermal power plant, and the drying method is as follows:

[0014] S1, coal powder is put into the vertical cylinder from the feed port on the vertical cylinder, the coal powder falls to the top of the supporting hole plate, high-temperature flue gas is introduced from the flue gas inlet at the bottom of the vertical cylinder, and the coal powder is contacted and mixed with the high-temperature flue gas for drying;

[0015] S2, part of the high-temperature flue gas is introduced into the flue gas guide shell through the flue gas guide box and the vertical pipe, and the corrugated expansion pipe introduces the flue gas to expand, pushing the cone head plate down so that the cone head at the bottom of the cone head plate passes through the bottom of the retaining mesh shell to crush the coal blocks;

[0016] S3, part of the dried pulverized coal rises and passes through the conical barrel into the interior of the separation barrel, part of the high-temperature flue gas is introduced into the corresponding flue gas heating box through the flue gas guide frame and the connecting pipe, the flue gas heating box heats the incoming flue gas, the first flue gas release block releases the heated flue gas downward, and the second flue gas release block releases the heated flue gas upward, so that the pulverized coal circulates inside the separation barrel and contacts the heated flue gas, thereby improving the quality of the dried pulverized coal;

[0017] S4. The upgraded and dried coal powder passes through the two separation barrels and is released outward from the discharge end at the top of the vertical barrel.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention can form two independent coal powder drying areas inside the vertical cylinder by arranging two partition drying modules connected together one above and one below. The coal powder is first contacted and mixed with the high-temperature flue gas introduced from the flue gas inlet at the bottom of the vertical cylinder to carry out the first round of drying. Part of the high-temperature flue gas is introduced into the flue gas guide shell by the flue gas guide box and the vertical pipe. The corrugated expansion pipe introduces the flue gas and stretches it to push the cone head plate down, so that the cone head at the bottom of the cone head plate passes under the material retaining mesh shell, which can effectively crush the rising coal blocks, so as to improve the drying effect of the coal powder in the bottom area of ​​the vertical cylinder. Part of the dried coal powder rises and passes through the conical barrel into the interior of the partition barrel of the first section. , part of the high-temperature flue gas is introduced into the corresponding flue gas heating box by the flue gas guide frame. The flue gas heating box can heat the incoming flue gas, and the heated flue gas can be released downward from the upper position through the first flue gas release block, and the second flue gas release block releases the heated flue gas upward from the lower position, so that the coal powder passing through the grid plate can circulate inside the separation barrel and contact with the heated flue gas, thereby extending the residence time of the coal powder in the drying area, and improving the mixing contact time and reaction effect of the coal powder and the heated flue gas, thereby effectively completing the quality improvement and drying of the coal powder, achieving the effect of allowing the coal powder to be discharged after multiple rounds of drying, improving the drying effect of the coal powder, and improving the drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution in the embodiment, the drawings in the embodiment are briefly introduced below.

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is a schematic cross-sectional structure diagram of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the separation drying module in the present invention;

[0024] In the figure: 1. vertical cylinder; 2. conical barrel; 3. partition drying module; 31. partition barrel; 32. grid plate; 33. flue gas heating box; 34. first flue gas release block; 341. outer partition net; 35. second flue gas release block; 4. blocking treatment module; 41. flue gas guide shell; 411. vertical pipe; 42. cone head plate; 43. material blocking mesh shell; 44. corrugated extension pipe; 5. flue gas diversion module; 51. flue gas guide box; 52. supporting hole plate; 53. flue gas guide frame; 531. connecting pipe; 54. reinforcement ring; 6. combination barrel. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solution in the embodiment of the present invention in conjunction with the accompanying drawings in the embodiment of the present invention. Figures 1 to 3The detailed description of the structure will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0026] See also Figure 1 to Figure 3 In an embodiment of the present invention, a coal powder drying system for a thermal power plant includes a vertical cylinder 1, wherein a conical barrel 2 and two partition drying modules 3 are sequentially arranged inside the vertical cylinder 1 from bottom to top, wherein the partition drying module 3 includes a partition barrel 31, a mesh plate 32, a flue gas heating box 33, a first flue gas release block 34 and a second flue gas release block 35, wherein a blocking processing module 4 is arranged inside the conical barrel 2, wherein the blocking processing module 4 includes a flue gas guide shell 41, a cone head plate 42, a material blocking mesh shell 43 and a corrugated extension pipe 44, wherein the material blocking mesh shell 43 is fixed at the bottom end of the conical barrel 2 to block the rising coal powder, and the corrugated extension pipe 44 is connected to the flue gas guide shell 41 by a plurality of conical head plates 42, a material blocking mesh shell 43 and a corrugated extension pipe 44. 41 introduces flue gas for stretching, and the bottom end of the corrugated stretching tube 44 pushes the cone head plate 42 to descend inside the conical barrel 2 and approach the material blocking mesh shell 43, and the cone head at the bottom of the cone head plate 42 passes through the bottom of the material blocking mesh shell 43 to crush the coal blocks. A flue gas diversion module 5 is provided inside the vertical cylinder 1, and the flue gas diversion module 5 includes a flue gas guide box 51, a supporting hole plate 52 and a flue gas guide frame 53. The supporting hole plate 52 is positioned above the flue gas inlet at the bottom end of the vertical cylinder 1 through the flue gas guide box 51, and three flue gas guide frames 53 are fixedly connected to the top of the flue gas guide box 51. The flue gas guide frame 53 guides the released flue gas into the conical barrel 2 and the separation drying module 3.

[0027] The vertical cylinder 1 provides a drying space for the coal powder. The coal powder is put into the vertical cylinder 1 from the feed port on the vertical cylinder 1. The high-temperature flue gas is introduced from the flue gas inlet at the bottom of the vertical cylinder 1, so that the coal powder is contacted and mixed with the high-temperature flue gas inside the vertical cylinder 1 for drying. The vertical cylinder 1 is provided with a conical barrel 2 and two partition drying modules 3 connected in sequence from bottom to top. The conical barrel 2 guides the rising coal powder, and the partition drying module 3 forms two independent drying areas inside the vertical cylinder 1. The coal powder is guided by the conical barrel 2 and sequentially enters the two partition drying modules 3 for further drying.

[0028] There are two mesh plates 32 and two smoke heating boxes 33. The two mesh plates 32 are fixedly connected inside the partition barrel 31, one above and one below. The two smoke heating boxes 33 are fixedly connected to the bottom of the two mesh plates 32, respectively, to stably position the two smoke heating boxes 33 in the outer area at both ends of the partition barrel 31. The first smoke release block 34 is fixedly connected to the bottom of the mesh plate 32 at the upper position, and the second smoke release block 35 is fixedly connected to the bottom of the mesh plate 32 at the lower position, to stably position the first smoke release block 34 and the second smoke release block 35 inside the partition barrel 31. The two partition barrels 31 in the upper and lower distribution are fixedly connected, the bottom end of the partition barrel 31 at the lower position is fixedly connected to the top of the conical barrel 2, stably connecting the two partition drying modules 3 and the conical barrel 2, and the mesh plate 32 at the upper position is fixedly connected to the discharge end at the top of the vertical barrel 1 to position the two partition drying modules 3 and the conical barrel 2 inside the vertical barrel 1. The first smoke release block 34 is connected to the output end of the corresponding smoke heating box 33, and the second smoke release block 35 is connected to the output end of the smoke heating box 33 at the lower position. The first smoke release block 34 and the second smoke release block 35 can respectively release the smoke that enters and is heated inside the corresponding smoke heating box 33. The first smoke release block 34 releases smoke downward from the upper position, and the second smoke release block 35 releases smoke upward from the lower position, which can effectively allow the coal powder to circulate inside the partition barrel 31. The surface of the first smoke release block 34 is fixedly connected to an outer partition net 341, which can block the coal powder, so that the coal powder can continue to rise from the middle area of ​​the first smoke release block 34 after being hit, and effectively allow the coal powder to enter the upper position of the partition barrel 31 to continue the drying operation. A combination cylinder 6 is provided on the outside of the separation and drying module 3, and the inner wall of the combination cylinder 6 is fixedly connected to the grid plate 32 and the separation cylinder 31, stably connecting the two separation and drying modules 3 distributed up and down, and at the same time being able to shield the separation and drying module 3 from the outside, ensuring the smooth discharge of coal powder on the outside of the separation and drying module 3.

[0029] The blocking processing module 4 is arranged inside the conical barrel 2. The blocking processing module 4 is composed of a smoke guide shell 41, a cone head plate 42, a material blocking mesh shell 43 and a corrugated extension pipe 44. The material blocking mesh shell 43 is fixed to the bottom end of the conical barrel 2. The material blocking mesh shell 43 can block the rising coal powder from the bottom end of the conical barrel 2, so that the coal powder can be dried in the bottom area of ​​the vertical cylinder 1. The smoke guide shell 41 is fixedly connected to the outer wall of the conical barrel 2, the cone head plate 42 is slidably connected inside the material blocking mesh shell 43, the corrugated extension pipe 44 is fixedly connected to the output end of the smoke guide shell 41, and the other end of the corrugated extension pipe 44 is fixedly connected to the top of the cone head plate 42, and the cone head plate 42 is stably positioned between the conical barrel 2 and the material blocking mesh shell 43. The smoke guide shell 41 can guide the smoke into the interior of the corrugated expansion tube 44. The smoke introduced into the interior of the corrugated expansion tube 44 can expand, so that the bottom end of the corrugated expansion tube 44 pushes the cone head plate 42 to descend inside the conical barrel 2 and approach the material blocking mesh shell 43. The cone head at the bottom of the cone head plate 42 can pass through the corresponding mesh holes on the material blocking mesh shell 43, so that the cone head passes downward to the bottom of the material blocking mesh shell 43. When the cone head passes through the bottom of the material blocking mesh shell 43, it contacts the coal blocks in the rising coal powder, which can break the coal blocks and effectively break the rising coal powder, thereby improving the drying effect of the coal powder in the bottom area of ​​the vertical cylinder 1.

[0030] The smoke diversion module 5 is arranged in the lower part of the vertical cylinder 1. The smoke diversion module 5 is composed of a smoke guide box 51, a supporting orifice plate 52 and a smoke guide frame 53. The smoke guide box 51 is fixedly connected to the inside of the vertical cylinder 1, the supporting orifice plate 52 is fixedly connected to the inside of the smoke guide box 51, and three smoke guide frames 53 are fixed to the top of the smoke guide box 51, so that the smoke diversion module 5 is stably connected to the inside of the vertical cylinder 1. A reinforcement ring 54 is fixedly connected to the outer wall of the vertical cylinder 1. The reinforcement ring 54 is fixedly connected to the outer wall of the smoke guide box 51. The back of the smoke guide frame 53 is fixed to the inner wall of the vertical cylinder 1, which plays a role in reinforcing the smoke diversion module 5. The supporting orifice plate 52 is positioned above the smoke inlet at the bottom end of the vertical cylinder 1, so that the coal powder entering the inside of the vertical cylinder 1 can fall onto the supporting orifice plate 52, and the supporting orifice plate 52 plays a role in supporting the coal powder. The high-temperature flue gas introduced by the flue gas inlet at the bottom of the vertical cylinder 1 rises to the top of the supporting orifice plate 52 through the supporting orifice plate 52, so that the coal powder and the high-temperature flue gas are in contact and mixed for drying. The air inlet at the bottom of the flue gas guide box 51 can guide part of the flue gas to enter. The outer wall of the flue gas guide shell 41 is fixedly connected with a vertical pipe 411, and the other end of the vertical pipe 411 is fixedly connected to the top of the flue gas guide box 51, so that part of the flue gas can be guided into the inside of the flue gas guide shell 41 through the vertical pipe 411 to ensure that the cone head plate 42 can stably move vertically inside the conical barrel 2. Four connecting pipes 531 are fixedly connected to the inner wall of the flue gas guide frame 53, and the other end of the connecting pipe 531 is fixedly connected to the input end of the corresponding flue gas heating box 33, so that part of the flue gas can effectively enter the corresponding flue gas heating box 33, thereby effectively performing the flue gas heating operation.

[0031] Two separated drying modules 3 connected one above and one below form two independent coal powder drying areas inside the vertical cylinder 1. The coal powder is first contacted and mixed with the high-temperature flue gas introduced from the flue gas inlet at the bottom of the vertical cylinder 1 to carry out the first round of drying. Part of the high-temperature flue gas is introduced into the flue gas guide shell 41 through the flue gas guide box 51 and the vertical pipe 411. The corrugated extension pipe 44 extends to push the cone head plate 42 downward, so that the cone head at the bottom of the cone head plate 42 passes under the material blocking mesh shell 43, which can effectively crush the rising coal blocks to improve the drying effect of the coal powder in the bottom area of ​​the vertical cylinder 1. Part of the dried coal powder rises through the conical barrel 2 and enters the interior of the partition barrel 31 at the lower position. Part of the high-temperature flue gas is introduced into the corresponding flue gas heating box 33 by the flue gas guide frame 53. The flue gas heating box 33 heats the incoming flue gas, and releases the heated flue gas downward from the upper position through the first flue gas release block 34. The second flue gas release block 35 releases the heated flue gas upward from the lower position, allowing the coal powder that passes through the grid plate 32 to circulate inside the partition barrel 31 and contact the heated flue gas, extending the residence time of the coal powder in the drying area, and increasing the mixing contact time and reaction effect of the coal powder and the heated flue gas, thereby effectively completing the quality improvement and drying of the coal powder. The coal powder that has been quality improved and dried in the first drying area enters the second drying area for further drying, and is released outward from the discharge end at the top of the vertical barrel 1, achieving the effect of allowing the coal powder to be discharged outward after multiple rounds of drying, thereby improving the drying effect of the coal powder and improving the drying efficiency.

[0032] The working principle of the present invention is as follows: coal powder is put into the vertical cylinder 1 from the feed port on the vertical cylinder 1, and the coal powder falls to the top of the supporting hole plate 52, and the high-temperature flue gas is introduced from the flue gas inlet at the bottom of the vertical cylinder 1. The coal powder is contacted and mixed with the high-temperature flue gas for drying treatment. Part of the high-temperature flue gas is introduced into the flue gas guide shell 41 through the flue gas guide box 51 and the vertical pipe 411. The corrugated expansion pipe 44 introduces the flue gas to expand, pushing the cone head plate 42 down to allow the cone head at the bottom of the cone head plate 42 to penetrate to the bottom of the retaining mesh shell 43 to break the coal blocks, and part of the dry coal powder rises and penetrates The pulverized coal passes through the conical barrel 2 and enters the interior of the separation barrel 31, and part of the high-temperature flue gas is introduced into the corresponding flue gas heating box 33 by the flue gas guide frame 53 and the connecting pipe 531. The flue gas heating box 33 heats the incoming flue gas, and the first flue gas release block 34 releases the heated flue gas downward, and the second flue gas release block 35 releases the heated flue gas upward, so that the pulverized coal circulates inside the separation barrel 31 and contacts with the heated flue gas, thereby improving the quality of the pulverized coal and drying it. The improved and dried pulverized coal passes through the two separation barrels 31 and is released outward from the discharge end at the top of the vertical barrel 1.

[0033] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A pulverized coal drying system for a thermal power plant, comprising a vertical cylinder (1), characterized in that: The vertical cylinder (1) is provided with a conical material cylinder (2) and two partition drying modules (3) in order from bottom to top, and the partition drying module (3) comprises a partition material cylinder (31), a grid plate (32), a smoke heating box (33), a first smoke release block (34) and a second smoke release block (35); A blocking processing module (4) is provided inside the conical barrel (2), and the blocking processing module (4) comprises a smoke guide shell (41), a cone head plate (42), a material blocking mesh shell (43) and a corrugated extension pipe (44). The material blocking mesh shell (43) is fixed to the bottom end of the conical barrel (2) to block the rising coal powder. The corrugated extension pipe (44) is extended by introducing smoke from the smoke guide shell (41). The bottom end of the corrugated extension pipe (44) pushes the cone head plate (42) to descend inside the conical barrel (2) to approach the material blocking mesh shell (43). The cone head at the bottom of the cone head plate (42) penetrates below the material blocking mesh shell (43) to crush the coal blocks. A smoke diversion module (5) is provided inside the vertical cylinder (1), and the smoke diversion module (5) comprises a smoke guide box (51), a material supporting hole plate (52) and a smoke guide frame (53); the material supporting hole plate (52) is positioned above the smoke inlet at the bottom end of the vertical cylinder (1) through the smoke guide box (51); the top of the smoke guide box (51) is fixedly connected to three smoke guide frames (53); the smoke guide frames (53) guide and release smoke into the conical cylinder (2) and the partition drying module (3).

2. A pulverized coal drying system for a thermal power plant according to claim 1, characterized in that: The two smoke heating boxes (33) are respectively fixedly connected to the bottom of the two grid plates (32), the first smoke release block (34) is fixedly connected to the bottom of the grid plate (32) at the upper position, the first smoke release block (34) is connected to the output end of the corresponding smoke heating box (33), and the surface of the first smoke release block (34) is fixedly connected with an external partition net (341).

3. A pulverized coal drying system for a thermal power plant according to claim 1, characterized in that: The number of the grid plates (32) and the number of the smoke heating boxes (33) are both two. The two grid plates (32) are fixed one above and one below inside the partition barrel (31) and position the two smoke heating boxes (33) on the outside of the two ends of the partition barrel (31). The second smoke release block (35) is positioned at the bottom of the grid plate (32) at the lower position through the smoke heating box (33) at the lower position, and the first smoke release block (34) is positioned at the bottom of the grid plate (32) at the upper position through the smoke heating box (33) at the upper position; the second smoke release block (35) is connected to the output end of the smoke heating box (33) at the lower position.

4. A pulverized coal drying system for a thermal power plant according to claim 1, characterized in that: The two partition barrels (31) located in upper and lower distributions are fixedly connected, and the bottom end of the partition barrel (31) at the lower position is fixedly connected to the top end of the conical barrel (2).

5. A pulverized coal drying system for a thermal power plant according to claim 1, characterized in that: The smoke guide shell (41) is fixedly connected to the outer wall of the conical barrel (2), the cone head plate (42) is slidably connected to the inside of the material blocking mesh shell (43), the corrugated extension tube (44) is fixedly connected to the output end of the smoke guide shell (41), and the other end of the corrugated extension tube (44) is fixedly connected to the top of the cone head plate (42).

6. A pulverized coal drying system for a thermal power plant according to claim 1, characterized in that: The smoke guide box (51) is fixedly connected to the interior of the vertical cylinder (1), the support hole plate (52) is fixedly connected to the interior of the smoke guide box (51), and a reinforcement ring (54) is fixedly connected to the outer wall of the vertical cylinder (1), and the reinforcement ring (54) is fixedly connected to the outer wall of the smoke guide box (51).

7. A pulverized coal drying system for a thermal power plant according to claim 1, characterized in that: Four connecting pipes (531) are fixedly connected to the inner wall of the smoke guide frame (53), and the other ends of the connecting pipes (531) are fixedly connected to the input ends of the corresponding smoke heating box (33). A vertical pipe (411) is fixedly connected to the outer wall of the smoke guide shell (41), and the other ends of the vertical pipes (411) are fixedly connected to the top of the smoke guide box (51).

8. A pulverized coal drying system for a thermal power plant according to claim 1, characterized in that: A combination cylinder (6) is provided on the outside of the separation drying module (3), and the inner side wall of the combination cylinder (6) is fixedly connected to the grid plate (32) and the separation material cylinder (31).

9. A pulverized coal drying system for a thermal power plant according to any one of claims 1 to 8, characterized in that: The drying method of the drying system is as follows: S1, coal powder is fed into the vertical cylinder (1) from the feed port on the vertical cylinder (1), the coal powder falls to the top of the support plate (52), high-temperature flue gas is introduced from the flue gas inlet at the bottom of the vertical cylinder (1), and the coal powder is contacted and mixed with the high-temperature flue gas to be dried; S2, part of the high-temperature flue gas is introduced into the flue gas guide shell (41) through the flue gas guide box (51) and the vertical pipe (411), and the corrugated expansion pipe (44) expands when introducing the flue gas, thereby pushing the cone head plate (42) downward and allowing the cone head at the bottom of the cone head plate (42) to pass through the bottom of the material retaining mesh shell (43) to crush the coal blocks; S3, part of the dried pulverized coal rises and passes through the conical barrel (2) into the interior of the partition barrel (31), part of the high-temperature flue gas is introduced into the corresponding flue gas heating box (33) through the flue gas guide frame (53) and the connecting pipe (531), the flue gas heating box (33) heats the incoming flue gas, the first flue gas release block (34) releases the heated flue gas downward, and the second flue gas release block (35) releases the heated flue gas upward, so that the pulverized coal circulates inside the partition barrel (31) and contacts the heated flue gas, thereby improving the quality of the dried pulverized coal; S4. The upgraded and dried coal powder passes through the two separation barrels (31) and is released outward from the discharge end at the top of the vertical barrel (1).

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