Conveying device for blending combustion quality-improved lignite powder of thermal power plant

Abstract

The invention discloses a coal powder conveying device for blending combustion of quality-improved lignite in a thermal power plant, and belongs to the technical field of coal powder conveying. The coal powder conveying device comprises a coal powder conveyor, an outer restraining module is arranged on the side edge of the coal powder conveyor, and the outer restraining module comprises a side edge blocking shell, a blanking area blocking shell and a material distributing plate; according to the device, the outer restraining module guides the lignite powder to accurately fall to the low end of the pulverized coal conveyor, the lignite powder conveyed in an accumulated mode gradually covers the middle area expansion belt, the positioning beam and the multiple inclined expansion belts and continues to be conveyed upwards, the discharging area blocking shell is located in the discharging area of the lower end of the pulverized coal conveyor through the side edge blocking shells, and the discharging area blocking shell is located in the discharging area of the lower end of the pulverized coal conveyor. The middle area expansion belt and the inclined expansion belt are intermittently inflated and expanded so as to achieve the effect of impacting and expanding the coal powder from the interior of the stacked and conveyed coal powder, vibration reorganization and state processing of the coal powder can be effectively conducted on the interior of the stacked and conveyed lignite powder, and the phenomenon that the coal powder is extruded and agglomerated in the lower area is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of coal powder transportation, and in particular to a transportation device for mixing and burning improved lignite powder in a thermal power plant. Background Art

[0002] Thermal power plants blend and burn lignite pulverized coal to improve its quality in order to reduce combustion costs and improve boiler efficiency. The blended and improved lignite pulverized coal is transported to the coal bunker and coal mill through a belt pulverized coal conveyor. The lignite pulverized coal falls at the lower end of the belt conveyor, where it accumulates and is transported upward through the conveyor belt. During the transportation process, the lignite pulverized coal continues to fall at the lower end of the belt conveyor, causing the conveyor belt to continuously transport the accumulated lignite pulverized coal. The lower part of the accumulated lignite pulverized coal is prone to extrusion and agglomeration, which causes agglomerations in the lignite pulverized coal that is transported to the next stage. The agglomerates will also mix and increase when they contact the coal pulverized coal, causing the lignite pulverized coal in the upper part of the accumulated transportation area to fall to the outside of the belt conveyor, resulting in waste. At the same time, some lumps will adhere to the surface of the conveyor belt and follow the conveyor belt in circulation. It is impossible to effectively vibrate and straighten the accumulated lignite coal powder from the inside and process the state of the lignite coal powder. It is also impossible to process the coal powder lumps on the surface during the conveyor belt's circulation process, which affects the stable conveying operation of the conveyor belt and thus affects the normal use of the belt coal powder conveyor. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a conveying device for blending and upgrading lignite pulverized coal in a thermal power plant. An external constraint module is set to guide the lignite pulverized coal to accurately fall to the lower end of the pulverized coal conveyor. The accumulated and conveyed lignite pulverized coal gradually covers the middle expansion belt, the positioning beam and a plurality of inclined expansion belts and continues to be conveyed upward. The middle expansion belt and the inclined expansion belt are intermittently inflated to achieve the effect of impacting and expanding the pulverized coal from the inside of the accumulated and conveyed coal, effectively vibrating and tidying up and treating the inside of the lignite pulverized coal from the accumulated and conveyed coal, reducing the extrusion and agglomeration of pulverized coal in the lower area, and a shaping pressure plate presses down the shaped conveyor belt from the inclined feeding area at the high end of the pulverized coal conveyor, so that the contoured scraper plate can effectively scrape off the surface agglomerates of the conveyor belt passing through the inclined feeding area, thereby improving the stability of the pulverized coal conveyor in conveying lignite pulverized coal, 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: A conveying device for blending and burning upgraded lignite pulverized coal in a thermal power plant, comprising a pulverized coal conveyor, an external constraint module being provided on the side of the pulverized coal conveyor, the external constraint module comprising a side baffle shell, a drop zone baffle shell and a dividing plate, the drop zone baffle shell being positioned in the drop zone at the lower end of the pulverized coal conveyor through the side baffle shell, the dividing plate being positioned above the pulverized coal conveyor through the side baffle shell to separate the conveying zone above the pulverized coal conveyor and the lignite pulverized coal from the middle position; two pulverized coal internal expansion processing modules being respectively located on both sides of the dividing plate are provided above the pulverized coal conveyor, the pulverized coal internal expansion processing modules comprising a positioning beam, a middle zone expansion belt, an oblique expansion belt, a metal plate and an air extraction drive component, the middle zone expansion belt being positioned on the side of the dividing plate through the positioning beam, the middle zone expansion belt being positioned The belt is fixedly connected to the output end of the air extraction drive to guide the gas to intermittently enter the interior of the middle zone expansion belt. The outer wall of the middle zone expansion belt fixes several oblique expansion belts through several metal plates. The oblique expansion belt guides part of the gas from the interior of the middle zone expansion belt into the interior of the oblique expansion belt. The middle zone expansion belt and several oblique expansion belts are intermittently inflated to impact the accumulated and transported lignite pulverized coal from the inside. A conveyor belt surface treatment module is provided at the front end of the dividing plate. The conveyor belt surface treatment module includes a shaping pressure plate and a profiling scraper plate. The profiling scraper plate is positioned in the inclined unloading area at the high end of the pulverized coal conveyor through the shaping pressure plate. The shaping pressure plate presses down to shape the pulverized coal conveyor so as to process the surface lumps of the pulverized coal conveyor through the profiling scraper plate.

[0005] Furthermore, the side baffle shell is fixedly connected to the side of the coal powder conveyor, and the material drop zone baffle shell is fixedly connected to the top of the side baffle shell.

[0006] Furthermore, the top of the material dividing plate is flush with the top of the side baffle shell, and a plurality of top plates are fixedly connected to the top of the material dividing plate, and the top plate is fixedly connected to the top of the side baffle shell, and two symmetrically distributed material guide inclined plates are fixedly connected to the top of the material dividing plate, and the material guide inclined plates are located on the inner side of the baffle shell in the blanking area.

[0007] Furthermore, a plurality of fixing blocks are fixedly connected to the side of the dividing plate, and the other end of the fixing block is fixedly connected to the corresponding positioning beam.

[0008] Furthermore, the outer wall of the side baffle shell is fixedly connected to a fixed frame, the air extraction and supply drive component is fixedly connected to the inner side of the fixed frame, the output end of the air extraction and supply drive component is fixedly connected to an air pipe, and the other end of the air pipe is fixedly connected to the air inlet end of the middle zone expansion zone.

[0009] Furthermore, the middle zone expansion belt is fixedly connected to the outer wall of the positioning beam, and the lower end of the positioning beam is fixedly connected to the outer wall of the trachea.

[0010] Furthermore, several of the oblique expansion bands are distributed along the outer wall of the middle expansion band, the air inlet end of the oblique expansion band is fixedly connected to the outer wall of the middle expansion band, the middle position of the outer wall of the oblique expansion band is fixedly connected to the metal plate, a reinforcement rod is fixedly connected to the outer side of the metal plate, and the reinforcement rod is fixedly connected to the side of the dividing plate.

[0011] Furthermore, a clearance groove is provided at the front end of the dividing plate, the shaping pressure plate is fixedly connected inside the clearance groove, the bottom of the shaping pressure plate is close to the conveyor belt surface of the coal powder conveyor, the profiling scraper plate is located in front of the shaping pressure plate, the top of the profiling scraper plate is fixedly connected with a combination plate, the other end of the combination plate is fixedly connected to the top of the shaping pressure plate, the top of the profiling scraper plate is fixedly connected with a combination block, and the combination block is fixedly connected to the front end of the dividing plate.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The present invention sets an external constraint module positioned in the conveying area of ​​the coal powder conveyor to guide the lignite coal powder to fall accurately to the lower end of the coal powder conveyor, and constrains the coal powder from the outside to be directly conveyed in the two separated conveying areas, thereby improving the conveying stability. The accumulated and conveyed coal powder gradually covers the middle zone expansion belt, the positioning beam and a plurality of oblique expansion belts and continues to be conveyed upward. The middle zone expansion belt positioned in the conveying area is intermittently guided to enter the gas by the air pumping drive member, and the gas will be dispersed into a plurality of oblique expansion belts distributed at different positions in the conveying area. The middle zone expansion belt and the oblique expansion belt are intermittently inflated to achieve The effect of impacting and expanding the coal powder from the inside of the accumulated coal powder can be achieved, which can effectively vibrate, straighten and condition the coal powder from the inside of the accumulated coal powder, reduce the extrusion and agglomeration of coal powder in the lower area, and the shaping pressure plate at the front end of the dividing plate can press down the shaped conveyor belt from the inclined discharge area at the high end of the coal powder conveyor to prevent the conveyor belt from being compressed and deformed when it is close to the profiling scraper plate, so that the profiling scraper plate can effectively scrape off the surface agglomerates of the passing conveyor belt from the inclined discharge area, avoid wasting coal powder, improve the stability of the coal powder conveyor in transporting lignite coal powder, and improve the conveying efficiency of lignite coal powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solution in the embodiment, the drawings in the embodiment are briefly introduced below.

[0014] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of another perspective of the present invention; Figure 3 It is a side view structural schematic diagram of the present invention; Figure 4It is a schematic diagram of the partially separated structure of the present invention; Figure 5 It is another schematic diagram of the partially separated structure of the present invention; In the figure: 1. Coal powder conveyor; 2. External constraint module; 21. Side baffle shell; 22. Baffle shell in the material drop zone; 23. Material dividing plate; 231. Top plate; 232. Material guide inclined plate; 233. Fixed block; 234. Make way groove; 3. Coal powder internal expansion processing module; 31. Positioning beam; 32. Middle zone expansion belt; 33. Oblique expansion belt; 34. Metal plate; 35. Pumping and supplying air drive member; 351. Air pipe; 36. Reinforcement rod; 4. Conveyor belt surface treatment module; 41. Forming pressure plate; 42. Contour scraper plate; 421. Combination plate; 422. Combination block; 5. Fixed frame. DETAILED DESCRIPTION

[0015] 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 5 The 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.

[0016] See also Figure 1 to Figure 5In an embodiment of the present invention, a conveying device for blending and burning improved lignite pulverized coal in a thermal power plant comprises a pulverized coal conveyor 1. An external constraint module 2 is provided on the side of the pulverized coal conveyor 1. The external constraint module 2 comprises a side baffle 21, a material drop zone baffle 22 and a material dividing plate 23. The material drop zone baffle 22 is positioned in the material drop zone at the lower end of the pulverized coal conveyor 1 through the side baffle 21. The material dividing plate 23 is positioned above the pulverized coal conveyor 1 through the side baffle 21 to separate the conveying area above the pulverized coal conveyor 1 and separate the lignite pulverized coal from the middle position. Two pulverized coal internal expansion processing modules 3 are provided above the pulverized coal conveyor 1, which are respectively located on both sides of the material dividing plate 23. The pulverized coal internal expansion processing module 3 comprises a positioning beam 31, a middle zone expansion belt 32, an oblique expansion belt 33, a metal plate 34 and an air extraction drive member 35. The middle zone expansion belt 32 is positioned on the material dividing plate 2 through the positioning beam 31. 3 side, the middle zone expansion belt 32 is fixedly connected to the output end of the air extraction drive 35 to guide the gas to intermittently enter the middle zone expansion belt 32, and the outer wall of the middle zone expansion belt 32 is fixed with a plurality of oblique expansion belts 33 through a plurality of metal plates 34. The oblique expansion belt 33 guides part of the gas from the middle zone expansion belt 32 into the oblique expansion belt 33. The middle zone expansion belt 32 and the plurality of oblique expansion belts 33 are intermittently inflated to impact the accumulated and transported lignite pulverized coal from the inside. A conveyor belt surface treatment module 4 is provided at the front end of the dividing plate 23. The conveyor belt surface treatment module 4 includes a shaping plate 41 and a profiling scraper plate 42. The profiling scraper plate 42 is positioned in the inclined feeding area at the high end of the pulverized coal conveyor 1 through the shaping plate 41. The shaping plate 41 presses down the shaped pulverized coal conveyor 1 to process the surface agglomeration of the pulverized coal conveyor 1 through the profiling scraper plate 42.

[0017] The pulverized coal conveyor 1 circulates and conveys the lignite pulverized coal through a conveyor belt, and the external constraint module 2 is arranged on the side of the pulverized coal conveyor 1, and the external constraint module 2 is composed of a side baffle 21, a material drop zone baffle 22, and a material dividing plate 23. The side baffle 21 is fixedly connected to the side of the pulverized coal conveyor 1, the material drop zone baffle 22 is fixedly connected to the top of the side baffle 21, the top of the material dividing plate 23 is flush with the top of the side baffle 21, and a plurality of top plates 231 are fixedly connected to the top of the material dividing plate 23, and the top plate 231 is fixedly connected to the top of the side baffle 21, stably combining the side baffle 21, the material drop zone baffle 22, and the material dividing plate 23, and stably connecting the external constraint module 2 to the conveying area of ​​the pulverized coal conveyor 1. The material drop zone baffle 22 is positioned in the material drop zone at the lower end of the coal powder conveyor 1 through the side baffle 21. The material drop zone baffle 22 can block the falling lignite pulverized coal from the outside, allowing the lignite pulverized coal to fall directly downward to the material drop zone at the lower end of the coal powder conveyor 1. The side baffle 21 blocks the lignite pulverized coal transported from the outer side of the conveyor belt on the coal powder conveyor 1, so that the external constraint module 2 plays the role of blocking and constraining the lignite pulverized coal that is being transported from the outside. Two symmetrically distributed guide ramps 232 are fixedly connected to the top of the dividing plate 23. The guide ramps 232 are located on the inner side of the material drop zone baffle 22. The lignite pulverized coal that falls into the inside of the material drop zone baffle 22 can be dispersed and guided by the guide ramps 232, allowing the lignite pulverized coal to be dispersed into the two conveying areas separated by the dividing plate 23, so as to stably and effectively transport the lignite pulverized coal in a stacked manner.

[0018] The two coal powder internal expansion processing modules 3 in the conveying area above the coal powder conveyor 1 are located on both sides of the dividing plate 23. The coal powder internal expansion processing module 3 is composed of a positioning beam 31, a middle area expansion belt 32, an oblique expansion belt 33, a metal plate 34 and an air extraction drive 35. A plurality of fixed blocks 233 are fixedly connected to the side of the dividing plate 23, and the other end of the fixed block 233 is fixedly connected to the corresponding positioning beam 31 to position the positioning beam 31 in the designated conveying area. The middle area expansion belt 32 is fixedly connected to the outer wall of the positioning beam 31 to position the middle area expansion belt 32 in the conveying area through the positioning beam 31. The central expansion zone 32 and the oblique expansion zone 33 are both flat belt structures with a hollow interior. The hollow areas inside the central expansion zone 32 and the oblique expansion zone 33 form a gas temporary storage cavity for gas to enter, so as to ensure the introduction of gas into the central expansion zone 32 and the oblique expansion zone 33, so that the central expansion zone 32 and the oblique expansion zone 33 can expand when gas is filled inside to change the state of the central expansion zone 32 and the oblique expansion zone 33. The outer wall of the side baffle shell 21 is fixedly connected to the fixed frame 5, and the air supply drive member 35 is fixedly connected to the inner side of the fixed frame 5. The output end of the air supply drive member 35 is fixedly connected to the air pipe 351, and the other end of the air pipe 351 is fixedly connected to the air inlet end of the middle expansion belt 32. The lower end of the positioning beam 31 is fixedly connected to the outer wall of the air pipe 351, and the positioning beam 31 is stably connected through the air pipe 351. At the same time, the air pipe 351 is connected to the middle expansion belt 32, so that the air supply drive member 35 can operate and intermittently fill and extract gas into and out of the middle expansion belt 32 through the air pipe 351, so as to effectively control the inflation, expansion and contraction and recovery operations of the middle expansion belt 32 in the designated conveying area. The air inlet end of the oblique expansion belt 33 is fixedly connected to the outer wall of the middle zone expansion belt 32, the middle position of the outer wall of the oblique expansion belt 33 is fixedly connected to the metal plate 34, the outer side of the metal plate 34 is fixedly connected to a reinforcing rod 36, and the reinforcing rod 36 is fixedly connected to the side of the dividing plate 23, and can stably position the oblique expansion belt 33 at the designated position on the side of the dividing plate 23, thereby positioning the oblique expansion belt 33 at the designated position in the conveying area. Several oblique expansion belts 33 are distributed along the outer wall of the middle zone expansion belt 32, so that several oblique expansion belts 33 can be positioned at different positions in the conveying area, so as to be effectively used independently at different positions in the conveying area. The oblique expansion belt 33 is connected to the middle zone expansion belt 32, so that the gas filled in the middle zone expansion belt 32 can be partially dispersed into the oblique expansion belt 33, and the oblique expansion belt 33 guides part of the gas from the inside of the middle zone expansion belt 32 to allow the oblique expansion belt 33 to expand. The gas in the middle expansion zone 32 is extracted, so that the gas in the oblique expansion zone 33 returns to the middle expansion zone 32 and continues to be extracted outward, which can effectively disperse the gas and allow the oblique expansion zone 33 to expand and shrink and recover in the conveying area.

[0019] The external constraint module 2 is positioned in the lignite pulverized coal falling area and the conveying area of ​​the pulverized coal conveyor 1, and can guide the lignite pulverized coal to fall accurately to the lower end of the pulverized coal conveyor 1, and constrain the lignite pulverized coal from the outside to directly carry out conveying operations in the two conveying areas separated above the pulverized coal conveyor 1, thereby improving the conveying stability. The lignite pulverized coal falls at the lower end of the pulverized coal conveyor 1 and accumulates on the conveyor belt. The pulverized coal conveyor 1 starts to convey the accumulated lignite pulverized coal through the conveyor belt. The accumulated and conveyed lignite pulverized coal gradually covers the middle expansion belt 32, the positioning beam 31 and several oblique expansion belts 33. The lignite pulverized coal continues to be conveyed upward driven by the conveyor belt. The middle expansion belt 32 positioned in the conveying area is intermittently guided into gas by the air pumping drive 35. The gas will be dispersed into several oblique expansion belts 33 distributed at different positions in the conveying area. The middle expansion belt 32 and the oblique expansion belt 33 are intermittently inflated to achieve the effect of impacting and expanding the pulverized coal from the inside of the accumulated and conveyed coal, which can effectively vibrate and rectify the inside of the lignite pulverized coal conveyed from the accumulation and state treatment, and reduce the extrusion and agglomeration of pulverized coal in the lower area.

[0020] The conveyor belt surface treatment module 4 in the conveying area is arranged at the front end of the dividing plate 23. The conveyor belt surface treatment module 4 is composed of a shaping plate 41 and a profiling scraper plate 42. The front end of the dividing plate 23 is provided with a clearance groove 234. The shaping plate 41 is fixedly connected inside the clearance groove 234. The bottom of the shaping plate 41 is close to the conveyor belt surface of the coal powder conveyor 1, which can effectively press down and shape the conveyor belt on the coal powder conveyor 1. The profiling scraper plate 42 is located in front of the shaping plate 41. The top of the profiling scraper plate 42 is fixedly connected with a combination plate 421. The other end of the combination plate 421 is fixedly connected to the top of the shaping plate 41. The top of the profiling scraper plate 42 is fixedly connected with a combination block 422. The combination block 422 is fixedly connected to the front end of the dividing plate 23, stably positioning and connecting the profiling scraper plate 42 at the front end of the dividing plate 23, and positioning the profiling scraper plate 42 in the inclined feeding area at the high end of the coal powder conveyor 1. The contoured scraper plate 42 is a plate-shaped structure formed by splicing three pieces of metal materials. The conveyor belt of the coal powder conveyor 1 is supported by the supporting member below, so that the part of the conveyor belt that transports coal powder is not in a horizontal state. The part of the conveyor belt that transports coal powder is horizontal in the middle, and the two sides are inclined upward. The contoured scraper plate 42 is divided into three areas to correspond to the three areas of the conveyor belt. The middle area of ​​the contoured scraper plate 42 is in a horizontal state to correspond to the middle area of ​​the conveyor belt, and the two side parts of the contoured scraper plate 42 are in a state of inclination upward to effectively adapt to the two side parts of the conveyor belt. The shaping pressure plate 41 at the front end of the dividing plate 23 can press down the shaped conveyor belt from the inclined unloading area at the high end of the coal powder conveyor 1 to prevent the conveyor belt from being compressed and deformed when it approaches the profiling scraper plate 42. After the conveyor belt is pressed down and shaped by the shaping pressure plate 41, it approaches the profiling scraper plate 42. The profiling scraper plate 42 scrapes off the surface agglomerates and attached coal powder of the conveyor belt passing through the inclined unloading area, and can effectively scrape off the surface coal powder agglomerates and attached coal powder during the circulation conveying process of the conveyor belt, reduce the situation where coal powder agglomerates follow the conveyor belt to move to the outside of the coal powder conveyor 1 and scatter, avoid waste of coal powder, improve the stability of the coal powder conveyor 1 in conveying lignite and improve the conveying efficiency of lignite and coal powder.

[0021] The working principle of the present invention is as follows: lignite pulverized coal falls at the lower end of the pulverized coal conveyor 1 and accumulates on the conveyor belt. The pulverized coal conveyor 1 starts to convey the accumulated lignite pulverized coal through the conveyor belt. The accumulated and conveyed lignite pulverized coal gradually covers the middle zone expansion belt 32, the positioning beam 31 and a plurality of oblique expansion belts 33. The lignite pulverized coal continues to be conveyed upward under the drive of the conveyor belt. The gas is intermittently guided into the middle zone expansion belt 32 by the gas extraction drive 35, and the gas is dispersed into a plurality of oblique expansion belts distributed at different positions in the conveying area. Inside 33, the middle expansion belt 32 and the oblique expansion belt 33 are intermittently inflated to impact and expand the coal powder from the inside of the accumulated and transported coal powder, thereby reducing the extrusion and agglomeration of the coal powder. The shaping pressure plate 41 presses down the shaped conveyor belt from the inclined discharge area at the high end of the coal powder conveyor 1, and the coal powder moves from above the shaping pressure plate 41 to approach the profiling scraper plate 42. The profiling scraper plate 42 scrapes off the surface agglomerates and attached coal powder of the conveyor belt passing through the inclined discharge area, and the scraped coal powder continues to be transported and discharged from the inclined discharge area.

[0022] 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 conveying device for blending and burning upgraded lignite pulverized coal in a thermal power plant, comprising a pulverized coal conveyor (1), characterized in that: The pulverized coal conveyor (1) is provided with an external constraint module (2) on the side thereof, the external constraint module (2) comprising a side baffle (21), a material drop zone baffle (22) and a material dividing plate (23), the material drop zone baffle (22) being positioned in the material drop zone at the lower end of the pulverized coal conveyor (1) through the side baffle (21), the material dividing plate (23) being positioned above the pulverized coal conveyor (1) through the side baffle (21) to separate the conveying zone above the pulverized coal conveyor (1) and to separate the lignite pulverized coal from the middle position; Two coal powder internal expansion processing modules (3) are provided above the coal powder conveyor (1), which are respectively located on both sides of the distribution plate (23). The coal powder internal expansion processing module (3) comprises a positioning beam (31), a middle zone expansion belt (32), an oblique expansion belt (33), a metal plate (34) and an air extraction drive member (35). The middle zone expansion belt (32) is positioned on the side of the distribution plate (23) through the positioning beam (31). The middle zone expansion belt (32) is fixedly connected to the air extraction drive member (35). 5) is arranged at an output end thereof to guide gas to intermittently enter the interior of the middle expansion zone (32); the outer wall of the middle expansion zone (32) is fixed with a plurality of the oblique expansion zones (33) via a plurality of the metal plates (34); the oblique expansion zones (33) guide part of the gas from the interior of the middle expansion zone (32) into the interior of the oblique expansion zones (33); the middle expansion zone (32) and the plurality of the oblique expansion zones (33) are intermittently inflated with gas to impact the accumulated and transported lignite pulverized coal from the inside.

2. The device for conveying pulverized lignite for blending and burning in thermal power plants according to claim 1 is characterized in that: A conveyor belt surface treatment module (4) is provided at the front end of the dividing plate (23), and the conveyor belt surface treatment module (4) comprises a shaping pressure plate (41) and a profiling scraper plate (42). The profiling scraper plate (42) is positioned at an inclined unloading area at the upper end of the coal powder conveyor (1) through the shaping pressure plate (41). The shaping pressure plate (41) presses down to shape the coal powder conveyor (1) so as to process the surface agglomerates of the coal powder conveyor (1) through the profiling scraper plate (42).

3. The device for conveying pulverized lignite for blending and burning quality-enhanced lignite in a thermal power plant according to claim 1, characterized in that: The side baffle shell (21) is fixedly connected to the side of the coal powder conveyor (1), and the material drop zone baffle shell (22) is fixedly connected to the top of the side baffle shell (21).

4. The device for conveying pulverized lignite for blending and burning in thermal power plants according to claim 1 is characterized in that: The top of the material dividing plate (23) is flush with the top of the side baffle shell (21); a plurality of top plates (231) are fixedly connected to the top of the material dividing plate (23); the top plates (231) are fixedly connected to the top of the side baffle shell (21); two symmetrically distributed material guiding inclined plates (232) are fixedly connected to the top of the material dividing plate (23); the material guiding inclined plates (232) are located on the inner side of the material dropping area baffle shell (22).

5. The device for conveying pulverized lignite for blending and burning quality-enhanced lignite in a thermal power plant according to claim 1, characterized in that: A plurality of fixing blocks (233) are fixedly connected to the side of the dividing plate (23), and the other end of the fixing block (233) is fixedly connected to the corresponding positioning beam (31).

6. The device for conveying pulverized lignite for blending and burning quality-enhanced lignite in a thermal power plant according to claim 1, characterized in that: The outer wall of the side baffle shell (21) is fixedly connected to a fixing frame (5), the air extraction and supply driving member (35) is fixedly connected to the inner side of the fixing frame (5), the output end of the air extraction and supply driving member (35) is fixedly connected to an air pipe (351), and the other end of the air pipe (351) is fixedly connected to the air inlet end of the middle zone expansion zone (32).

7. A conveying device for blending and burning upgraded lignite pulverized coal in a thermal power plant according to claim 6, characterized in that: The middle zone expansion band (32) is fixedly connected to the outer wall of the positioning beam (31), and the lower end of the positioning beam (31) is fixedly connected to the outer wall of the air pipe (351).

8. The device for conveying pulverized lignite for blending and burning quality-enhanced lignite in a thermal power plant according to claim 1, characterized in that: A plurality of the oblique expansion bands (33) are distributed along the outer wall of the middle expansion band (32); an air inlet end of the oblique expansion band (33) is fixedly connected to the outer wall of the middle expansion band (32); a middle position of the outer wall of the oblique expansion band (33) is fixedly connected to the metal plate (34); a reinforcement rod (36) is fixedly connected to the outer side of the metal plate (34); and the reinforcement rod (36) is fixedly connected to the side of the dividing plate (23).

9. The device for conveying pulverized lignite for blending and burning in thermal power plants according to claim 2, characterized in that: A clearance groove (234) is provided at the front end of the material distribution plate (23), the shaping plate (41) is fixedly connected inside the clearance groove (234), the bottom of the shaping plate (41) is in close contact with the conveyor belt surface of the coal powder conveyor (1), the profiling scraper plate (42) is located in front of the shaping plate (41), the top of the profiling scraper plate (42) is fixedly connected to a combination plate (421), the other end of the combination plate (421) is fixedly connected to the top of the shaping plate (41), the top of the profiling scraper plate (42) is fixedly connected to a combination block (422), and the combination block (422) is fixedly connected to the front end of the material distribution plate (23).

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