A boiler fuel addition device

Abstract

The application discloses a boiler fuel adding device and relates to the technical field of thermal power plants. The device comprises a pulverized coal pipeline, a mixed air pipeline, a rotary cleaning mechanism I and a sliding cleaning mechanism II. The pulverized coal pipeline comprises a horizontal section, a vertical section and an elbow section. The cleaning mechanism I is arranged at the elbow of the pulverized coal pipeline and can rotate by means of air flow. The device realizes real-time cleaning of the pulverized coal falling at the elbow, avoids the phenomenon of dust accumulation, and the cleaned pulverized coal can be synchronously conveyed to a Venturi tube between the mixed air pipeline and the pulverized coal pipeline by means of a connecting pipe, mixed with hot air flowing in the Venturi tube for the second time, heated and dried, returned to the pulverized coal pipeline again, and finally conveyed into a boiler for combustion, so that the pulverized coal is fully utilized. Moreover, the mixed air pipeline can also heat and dry the primary pulverized coal entering into the pulverized coal pipeline, thereby improving combustion efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of thermal power plants, and particularly relates to a boiler fuel adding device. BACKGROUND

[0002] The fuel adding method of the traditional thermal power plant is to grind the raw coal into coal powder by the coal mill, and then deliver the coal powder to the boiler furnace by the coal powder pipeline for combustion. However, in practice, the water content of coal is not completely consistent, and the water content of part of the coal is relatively high, which can easily cause two problems: 1. The coal powder with high water content will have a negative impact on the combustion of the boiler after being mixed with hot air due to the low temperature; 2. The coal powder with high water content is heavy and is prone to blockage during transportation, especially at the elbow where the pipeline is connected from bottom to top, which is difficult to clean.

[0003] A method for solving the above problems is also disclosed in the prior art, such as a coal powder control system for a boiler with a patent number CN217329858U, which adopts a scheme of setting a mixed air pipeline connected with a coal ash pipeline and a coal ash bin for collecting coal powder, but its defects are: on the one hand, the coal powder in the coal ash bin needs to be cleaned regularly and cannot be used for secondary use in real time, on the other hand, the coal ash pipeline horizontal section will also have a high probability of ash accumulation, which has a negative impact on the delivery efficiency of the coal powder. Therefore, it is necessary to improve the existing technology to further solve the above problems. SUMMARY

[0004] The purpose of the present application is to provide a boiler fuel adding device to solve the above-mentioned defects in the prior art.

[0005] A boiler fuel adding device, comprising a coal powder pipeline, a mixed air pipeline, a rotating cleaning mechanism one and a sliding cleaning mechanism two, the air inlet of the coal powder pipeline is connected to the coal outlet of the coal mill, the coal powder pipeline comprises a horizontal section, a vertical section and an elbow section between the horizontal section and the vertical section, a transition section for the rotation of the cleaning mechanism one is also provided at the elbow section, the cleaning mechanism one is installed at the elbow section and can rotate to clean and absorb the coal powder falling at the elbow by means of the airflow in the coal powder pipeline, the mixed air pipeline is connected to the middle section of the horizontal section by means of a Venturi tube, and the air inlet of the mixed air pipeline is connected to the hot air pipeline, the front and rear ends of the cleaning mechanism one are also connected to the interfaces provided at the front and rear ends of the Venturi tube by means of the connecting pipe to realize the feeding of the coal powder absorbed by the cleaning mechanism one into the Venturi tube for secondary heating and delivery, the cleaning mechanism two is slidingly connected in the horizontal section of the coal powder pipeline, and the cleaning mechanism two is connected with the cleaning mechanism one by means of a driving mechanism and is used for cleaning the ash accumulated on the inner wall of the coal powder pipeline.

[0006] Further, the inner wall of the transition section is in the shape of a 1 / 4 cylindrical surface.

[0007] Further, the cleaning mechanism one comprises a shaft tube, swing arms and a fan blade, both ends of the shaft tube are rotatably connected to the front and rear walls of the elbow section by bearings, the swing arms are divided into two groups, swing arms in each group are equidistantly arranged along the axis of the shaft tube, swing arms in the two groups are staggered in the axial direction of the shaft tube, the angle between the two groups of swing arms is 180 degrees with the shaft center of the shaft tube as the center, the swing arms are internally provided with ash removal channels connected with the shaft tube, and the swing arms are provided with ash suction ports at the ends, the ash suction ports are directed to one side of the shaft tube in the rotating direction, and the two fan blades are arranged on the shaft tube between the two groups of swing arms.

[0008] Further, the cleaning mechanism two comprises a plurality of ash scraping plates in contact with the inner wall of the pulverized coal pipeline, the ash scraping plates are connected together by connecting plates in the front and rear directions of the ash scraping plates.

[0009] Further, the driving mechanism comprises a gear ring, a transmission gear, a connecting rod, a sliding block and a sliding rail, the gear ring is installed at the front and rear ends of the shaft tube and is engaged with the transmission gear, the transmission gear is rotatably connected to the support shaft arranged on the outer wall of the pulverized coal pipeline by bearings, one end of the connecting rod is rotatably connected to a connecting column one arranged at the eccentric position of the transmission gear, the other end of the connecting rod is rotatably connected to a connecting column two arranged on the sliding block, the sliding block is slidably connected in the sliding rail arranged on the outer wall of the pulverized coal pipeline, and a permanent magnet one is arranged on one side of the sliding block directed to the pulverized coal pipeline, and a permanent magnet two is arranged on the inner wall of the middle part of the connecting plate matched with the permanent magnet one.

[0010] Further, one end of the connecting pipe is rotatably connected to the front and rear ends of the shaft tube by bearings.

[0011] Further, the left and right ends of the ash scraping plate are provided with chamfers.

[0012] Further, the left and right ends of the permanent magnet two are provided with chamfers.

[0013] The advantages of the present application are:

[0014] (1) The present application sets the cleaning mechanism one which can rotate by air flow at the elbow of the pulverized coal pipeline, realizes the real-time cleaning of the falling pulverized coal at the elbow, avoids the dust accumulation phenomenon, and the cleaned pulverized coal can be synchronously transported to the Venturi tube between the air mixing pipeline and the pulverized coal pipeline by the connecting pipe, mixed and heated again with the hot air flowing in the Venturi tube, and then flows back to the pulverized coal pipeline, and finally is transported to the boiler for combustion, realizing the full utilization of the pulverized coal.

[0015] (2) the cleaning mechanism one runs at the same time, and the cleaning mechanism two is driven to run by the driving mechanism, so that the inner wall of the horizontal section of the pulverized coal pipeline is cleaned, and the conveying efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present application.

[0017] Figure 2 It is a top view of the present application.

[0018] Figure 3 It is Figure 2 a sectional view in the direction indicated by the arrow.

[0019] Figure 4 It is a connection diagram of the cleaning mechanism one and the cleaning mechanism two.

[0020] Figure 5 It is a working schematic diagram of the present application.

[0021] Wherein, 1 pulverized coal pipeline, 10 horizontal section, 11 vertical section, 12 elbow section, 13 transition section, 2 mixed air pipeline, 20 venturi, 3 cleaning mechanism one, 30 shaft pipe, 31 swing arm, 32 fan blade, 33 ash removal channel, 34 ash suction port, 4 cleaning mechanism two, 40 ash scraping plate, 41 connecting plate, 5 driving mechanism, 50 gear ring, 51 transmission gear, 52 connecting rod, 53 sliding block, 54 connecting column one, 55 connecting column two, 56 sliding rail, 57 permanent magnet one, 58 permanent magnet two, 59 connecting pipe, 6 hot air pipeline, 7 coal mill, 9 boiler. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, purposes and effects realized by the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0023] As Figures 1 to 4 shown, a boiler fuel adding device, comprising a pulverized coal pipeline 1, a mixed air pipeline 2, a rotary cleaning mechanism one 3 and a sliding cleaning mechanism two 4, the air inlet of the pulverized coal pipeline 1 is connected to the coal outlet of the coal mill 7, the pulverized coal pipeline 1 comprises a horizontal section 10, a vertical section 11 and an elbow section 12 between the horizontal section 10 and the vertical section 11, the pulverized coal pipeline 1 of the vertical section 11 is connected to the boiler 9, and a transition section 13 for rotating the cleaning mechanism one 3 is further arranged at the elbow section 12, the inner wall of the transition section 13 is in the shape of a 1 / 4 cylindrical surface; wherein the hot air pipeline 6 is connected to the air inlet of the coal mill 7, so that a complete pulverized coal conveying system is formed.

[0024] The cleaning mechanism one 3 is installed at the elbow section 12 and can rotate by the air flow in the pulverized coal pipeline 1 to clean and absorb the pulverized coal falling at the elbow. The mixed air pipeline 2 is connected to the middle section of the horizontal section 10 by means of the Venturi tube 20. The air inlet of the mixed air pipeline 2 is connected to the hot air pipeline 6. The front and rear ends of the cleaning mechanism one 3 are also connected to the interfaces arranged at the front and rear ends of the Venturi tube 20 by means of the connecting pipe 59 to realize the pulverized coal absorbed by the cleaning mechanism one 3 into the Venturi tube 20 for secondary heating and conveying. The cleaning mechanism one 3 comprises a shaft pipe 30, a swing arm 31 and a fan blade 32. The two ends of the shaft pipe 30 are rotatably connected to the front and rear walls of the elbow section 12 by means of bearings and are sealed by commonly used sealing elements in the market. The swing arm 31 has two groups. Each group of swing arms 31 is composed of a plurality of swing arms 31 arranged equidistantly along the axis of the shaft pipe 30. The swing arms 31 in the two groups are arranged staggered in the axial direction of the shaft pipe 30. The swing arms 31 are arranged with an angle of 180 degrees between the two groups with the axis of the shaft pipe 30 as the center. The swing arm 31 is internally provided with an ash removal channel 33 connected to the shaft pipe 30. The swing arm 31 is provided with an ash suction port 34 at the end thereof. The ash suction port 34 is directed to the side of the shaft pipe 30 in the rotating direction. Two fan blades 32 are arranged on the shaft pipe 30 between the two groups of swing arms 31. One end of the connecting pipe 59 is rotatably connected to the front and rear ends of the shaft pipe 30 by means of bearings. The connecting pipe 59 is a rigid pipeline and is provided with a corresponding support mechanism to realize the stable support of the connecting pipe 59.

[0025] The cleaning mechanism two 4 is slidably connected in the horizontal section 10 of the pulverized coal pipeline 1. In the embodiment, it is slidably connected in the pulverized coal pipeline 1 between the middle section of the horizontal section 10 and the cleaning mechanism one 3. The main consideration is that the air flow is relatively chaotic at this position and the probability of dust accumulation is relatively high. The cleaning mechanism two 4 is connected to the cleaning mechanism one 3 by means of the driving mechanism 5 and is used to clean the dust accumulated on the inner wall of the pulverized coal pipeline 1. The cleaning mechanism two 4 comprises a plurality of dust scraping plates 40 in contact with the inner wall of the pulverized coal pipeline 1. The dust scraping plates 40 are connected together by means of connecting plates 41 arranged in the front and rear directions of the dust scraping plates 40.

[0026] In the embodiment, the driving mechanism 5 comprises a gear ring 50, a transmission gear 51, a connecting rod 52, a sliding block 53 and a sliding rail 56, the gear ring 50 is installed on the front and rear ends of the shaft pipe 30 and is engaged with the transmission gear 51, the transmission gear 51 is rotatably connected to the support shaft arranged on the outer wall of the pulverized coal pipeline 1 by means of a bearing, one end of the connecting rod 52 is rotatably connected to a connecting column I 54 arranged at the eccentric position of the transmission gear 51, the other end of the connecting rod 52 is rotatably connected to a connecting column II 55 arranged on the sliding block 53, the sliding block 53 is slidably connected in the sliding rail 56 arranged on the outer wall of the pulverized coal pipeline 1, and a permanent magnet I 57 is arranged on one side of the sliding block 53 facing the pulverized coal pipeline 1, and a permanent magnet II 58 matched with the permanent magnet I 57 is arranged on the middle inner wall of the connecting plate 41. In order to reduce the interference to the permanent magnet I 57 and the permanent magnet II 58, non-magnetic materials are used for other components; if the conditions are limited, weak magnetic materials can also be used to a certain extent. Considering that the speed of dust accumulation at the horizontal section 10 is slow, the outer diameter of the gear ring 50 is smaller than the outer diameter of the transmission gear 51, and the frequency of the back and forth movement of the cleaning mechanism II 4 can be reduced relative to the rotation frequency of the cleaning mechanism I 3.

[0027] In order to reduce the wind resistance, the left and right ends of the dust scraping plate 40 are provided with chamfers, and the left and right ends of the permanent magnet II 58 are also provided with chamfers.

[0028] As shown in Figure 5 The working principle of the present application is as follows:

[0029] The hot air pipeline 6 transports the coal powder discharged from the coal mill 7 into the pulverized coal pipeline 1 by means of wind after passing through the coal outlet of the coal mill 7, and the pulverized coal pipeline 1 further transports the coal powder into the boiler 9. In this process, the airflow generated in the pulverized coal pipeline 1 drives the fan blade 32 and the shaft pipe 30 to rotate, and the swing arm 31 also rotates and scrapes the coal powder falling into the elbow in the vertical pipe and is sucked away through the dust suction port 34, so that the coal powder does not accumulate at the elbow, and the sucked coal powder enters the shaft pipe 30 and is transported to the Venturi tube 20 through the connecting pipe 59, and the coal powder is mixed with the hot air flowing in the Venturi tube 20 for the second time and is heated and dried, and then flows back into the pulverized coal pipeline 1 and is finally transported into the boiler 9 for combustion, and the air mixing pipeline 2 can also heat and dry the primary coal powder entering the pulverized coal pipeline 1 to improve the combustion efficiency.

[0030] Because the airflow speed at the Venturi tube 20 is very high, a negative pressure is generated at the connecting port, and an suction force is generated in the shaft pipe 30 and the connecting pipe 59, so that the coal powder entering the dust removal pipeline is sucked into the Venturi tube 20, which is the reason why the Venturi tube 20 is arranged between the air mixing pipeline 2 and the pulverized coal pipeline 1.

[0031] When the shaft tube 30 rotates, the gear ring 50 also rotates, and drives the transmission gear 51 to rotate, and the transmission gear 51 drives the sliding block 53 to move back and forth along the length direction of the pulverized coal pipeline 1 by means of the connecting rod 52, and drives the ash scraping plate 40 to move back and forth by means of the attraction between the permanent magnet one 57 and the permanent magnet two 58, thereby scraping off the accumulated ash adhered to the inner wall of the pulverized coal pipeline 1, so as to improve the conveying efficiency.

[0032] From the common general knowledge, the application can be realized by other embodiments without departing from the spirit or essential characteristics of the application. Therefore, the above disclosed embodiments are only examples, and are not the only ones. All changes within the scope of the application or within the equivalent scope of the application are included in the application.

Claims

1. A boiler fuel adding device, characterized in that, The system includes a pulverized coal pipe (1), a mixing air pipe (2), a rotary cleaning mechanism one (3), and a sliding cleaning mechanism two (4). The air inlet of the pulverized coal pipe (1) is connected to the coal outlet of the coal mill (7). The pulverized coal pipe (1) includes a horizontal section (10), a vertical section (11), and a bend section (12) located between the horizontal section (10) and the vertical section (11). The bend section (12) is also provided with a transition section (13) for the cleaning mechanism one (3) to rotate. The cleaning mechanism one (3) is installed at the bend section (12) and can clean and absorb the pulverized coal that falls at the bend by means of the airflow rotation in the pulverized coal pipe (1). The mixing duct (2) is connected to the middle section of the horizontal section (10) by means of the venturi tube (20) and the air inlet of the mixing duct (2) is connected to the hot air duct (6). The front and rear ends of the cleaning mechanism one (3) are also connected to the interfaces set at the front and rear ends of the venturi tube (20) by means of the connecting pipe (59) to realize the coal powder absorbed by the cleaning mechanism one (3) into the venturi tube (20) for secondary heating and conveying. The cleaning mechanism two (4) is slidably connected in the horizontal section (10) of the coal powder duct (1). The cleaning mechanism two (4) is connected to the cleaning mechanism one (3) by means of the driving mechanism (5) and is used to clean the ash accumulation on the inner wall of the coal powder duct (1).

2. The boiler fuel adding device according to claim 1, characterized in that: The inner wall of the transition section (13) is 1 / 4 cylindrical.

3. The boiler fuel adding device according to claim 1, characterized in that: The cleaning mechanism (3) includes a shaft tube (30), a swing arm (31), and a fan blade (32). The two ends of the shaft tube (30) are rotatably connected to the front and rear walls of the elbow section (12) by means of bearings. There are two sets of swing arms (31). Each set of swing arms (31) consists of several swing arms (31) equidistantly arranged along the axis of the shaft tube (30). The swing arms (31) in the two sets of swing arms (31) are oriented along the axis of the shaft tube (30). The two sets of swing arms (31) are staggered, with the axis of the shaft tube (30) as the center. The included angle between the two sets of swing arms (31) is 180 degrees. The inside of the swing arm (31) is provided with a dust discharge channel (33) connected to the shaft tube (30), and the end of the swing arm (31) is provided with a dust suction port (34). The dust suction port (34) faces the side of the shaft tube (30) in the direction of rotation. Two fan blades (32) are respectively set on the shaft tube (30) between the two sets of swing arms (31).

4. A boiler fuel adding device according to claim 3, characterized in that: The second cleaning mechanism (4) includes several scraper blades (40) that are in contact with the inner wall of the pulverized coal pipe (1). The scraper blades (40) are connected together by means of a connecting plate (41), which is located in the front-back direction of the scraper blades (40).

5. A boiler fuel adding device according to claim 4, characterized in that: The drive mechanism (5) includes a gear ring (50), a transmission gear (51), a connecting rod (52), a slider (53), and a slide rail (56). The gear ring (50) is installed at both ends of the shaft tube (30) and meshes with the transmission gear (51). The transmission gear (51) is rotatably connected to the support shaft provided on the outer wall of the pulverized coal pipe (1) by means of a bearing. One end of the connecting rod (52) is rotatably connected to the connecting column one (54) provided at the eccentric position of the transmission gear (51), and the other end of the connecting rod (52) is rotatably connected to the connecting column two (55) provided on the slider (53). The slider (53) is slidably connected to the slide rail (56) provided on the outer wall of the pulverized coal pipe (1), and a permanent magnet one (57) is provided on the side of the slider (53) facing the pulverized coal pipe (1). A permanent magnet two (58) that cooperates with the permanent magnet one (57) is provided on the inner wall of the middle part of the connecting plate (41).

6. A boiler fuel adding device according to claim 3, characterized in that: One end of the connecting tube (59) is rotatably connected to the front and rear ends of the shaft tube (30) by means of a bearing.

7. A boiler fuel adding device according to claim 4, characterized in that: Both ends of the scraper blade (40) are chamfered.

8. A boiler fuel adding device according to claim 5, characterized in that: Both ends of the permanent magnet (58) are chamfered.

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