Plasma pulverized coal burner

Abstract

The invention discloses a plasma pulverized coal burner, and relates to the technical field of burners, the plasma pulverized coal burner comprises a base, the upper end of the base is provided with a pushing assembly, pulverized coal is pushed to a designated position through the pushing assembly, and the edge part of the upper end of the base is provided with a protection plate; according to the plasma pulverized coal burner, when a movable rod moves, an arc-shaped plate rotationally installed at the end of the movable rod is driven to move, so that the arc-shaped plate is tightly pressed on the inner wall of a screening barrel and rotates along with a fixed block, pulverized coal in the screening barrel is further screened, and the situation that the pulverized coal is caked is avoided; and meanwhile, the particles fall onto the collecting plate, so that the particles are uniformly distributed, and the combustion stability is ensured.

Description

Technical Field

[0001] The invention relates to burner technology, in particular to a plasma pulverized coal burner. Background Art

[0002] The pulverized coal burner is an important part of the cement rotary kiln system. It plays an important role in the stable operation of the rotary kiln, and has a significant impact on reducing fuel consumption, improving clinker production quality, and reducing harmful gas emissions. When the cold kiln is started, the pulverized coal burner needs to add 40% (thermal equivalent) of high calorific value starting fuel oil or natural gas and stable combustion backup fuel, which has the disadvantages of high cost, difficulty in fuel storage and supply, high temperature corrosion of the heating surface, reduced overall efficiency, and the presence of heavy metals and other highly toxic components in the exhaust gas.

[0003] In the past thirty years, plasma ignition technology has been gradually used in coal-fired power boiler burners in the thermal power industry. The specific power consumption of plasma ignition is 1.2-1.4% of the thermal power of the coal-fired burner. Under normal circumstances, when plasma ignition is stable, NOx emissions are reduced by 30-50%, and the amount of carbon not directly burned is reduced by 50-75%. The commonly used coal-fired ignition is a 50-250kVA plasma arc torch, which is based on a current (200-500A) and voltage 250-400V DC plasma arc torch. The anode life is generally less than 500 hours, the cathode life is less than 250 hours, and the operating cost is high.

[0004] When the existing equipment is in use, the uneven particle size and distribution of the coal powder will lead to uneven combustion, thus affecting the combustion stability; at the same time, it may cause the system for conveying coal powder to become blocked or the flow rate to be unstable, affecting the normal operation of the burner.

[0005] Since the physical properties of coal powder (such as hardness and humidity) may affect its crushing and distribution effects, resulting in uneven contact between coal powder and plasma, which may lead to reduced combustion efficiency, a plasma coal powder burner was developed. Summary of the invention

[0006] The object of the present invention is to provide a plasma pulverized coal burner to solve the above-mentioned deficiencies in the prior art.

[0007] In order to achieve the above object, the present invention provides the following technical solution: a plasma pulverized coal burner, comprising a base, the upper end of the base is provided with a pushing assembly, the pulverized coal is pushed to a specified position by the pushing assembly, and the edge portion of the upper end of the base is provided with a protective plate;

[0008] A pressing assembly, which is assembled at the upper end of the pushing assembly and is used to further screen the coal powder;

[0009] The pressing assembly includes a column, a screening cylinder is arranged at the end of the column, a fixing block is arranged on the inner wall of the screening cylinder, and the end of the fixing block penetrates and extends to the outside of the screening cylinder and is connected to the end of the column;

[0010] A support block is provided at one end of the fixed block away from the column, and a plurality of telescopic rods are slidably mounted on the outer surface of the support block, and the plurality of telescopic rods are evenly distributed on the outer surface of the support block, and the ends of the telescopic rods penetrate and extend into the interior of the support block;

[0011] A fixing column is provided at one end of the support block away from the fixing block, a circular ring is slidably mounted on the outer surface of the fixing column, a limiting rod corresponding to the telescopic rod is rotatably mounted on the outer surface of the circular ring, a connecting block corresponding to the limiting rod is rotatably mounted on the outer surface of the fixing column, a movable rod is rotatably mounted on the end of the connecting block, and one end of the limiting rod away from the circular ring is rotatably connected to the outer surface of the movable rod;

[0012] An arc plate is rotatably mounted on one end of the movable rod away from the connecting block, the inner wall of the arc plate is connected to the end of the telescopic rod, the outer surface of the arc plate is in contact with the inner wall of the screening cylinder, and an elastic member is sleeved on the outer surface of the fixed column, and one end of the elastic member is connected to the connecting block, and the other end is connected to the end of the ring;

[0013] A collecting plate is provided at one end of the column, and the collecting plate is located at the lower end of the screening cylinder.

[0014] As a further optimization scheme of the present invention, the inner wall of the collecting plate is symmetrically provided with sliding grooves, and a push block is slidably installed on the inner wall of the sliding groove, and the inner wall of the collecting plate is provided with an outlet hole.

[0015] As a further optimization solution of the present invention, a through hole is opened at the upper end of the outer surface of the screening cylinder.

[0016] As a further optimization scheme of the present invention, the pushing assembly includes a driving member connected to the protective plate, the output end of the driving member passes through and extends to the interior of the protective plate, and a crankshaft is provided at the output end of the driving member, and a pair of push rods are rotatably installed on the outer surface of the crankshaft.

[0017] As a further optimization scheme of the present invention, a positioning block is arranged at the upper end of the base, the inner cavity of the positioning block is symmetrically provided with guide grooves, a slider is slidably installed on the inner wall of the guide groove, and one end of the slider is rotatably connected to the push rod.

[0018] As a further optimization solution of the present invention, a driving rod is provided at one end of the sliding block away from the push rod, and an adjusting block is provided at the end of the driving rod.

[0019] As a further optimization solution of the present invention, a protection rod is rotatably mounted on one side of the sliding block, and one end of the protection rod away from the sliding block is rotatably connected to a symmetrically arranged adjustment block.

[0020] As a further optimization solution of the present invention, a connecting rod is provided at the upper end of the adjusting block, and the upper end of the connecting rod is slidably connected to the lower end of the collecting plate.

[0021] As a further optimization scheme of the present invention, a conveying block is arranged at the upper end of the base and on one side of the positioning block, a hole is opened through one end of the conveying block, and a feed hole is opened at the upper end of the conveying block, and the feed hole is located at the lower end of the outlet hole.

[0022] As a further optimization solution of the present invention, a movable block is slidably mounted on the inner wall of the hole, an adjusting rod is disposed at the end of the movable block, and the end of the adjusting rod is connected to the adjusting block.

[0023] Compared with the prior art, the plasma pulverized coal burner provided by the present invention has the following beneficial effects: when the movable rod moves, the arc plate rotatably mounted at its end is driven to move, thereby pressing the arc plate tightly against the inner wall of the screening cylinder and rotating with the fixed block, thereby further screening the pulverized coal inside the screening cylinder to avoid caking of the pulverized coal, and at the same time causing it to fall onto a collecting plate, ensuring uniform distribution of particle size, thereby ensuring combustion stability.

[0024] When the adjusting block moves, the connecting rod can be driven to move synchronously, wherein a magnetic block is arranged on the upper end of the connecting rod. Meanwhile, after the connecting rod is fitted with the collecting plate, the magnetic block on the connecting rod and the magnetic block on the lower end of the pushing block are attracted to each other, so that when the connecting rod moves, the pushing block can be driven to move synchronously, thereby pushing the coal powder and allowing the coal powder to slowly enter the pushing assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0026] Figure 1 A first schematic diagram of the overall structure provided by an embodiment of the present invention;

[0027] Figure 2 A second schematic diagram of the overall structure provided by an embodiment of the present invention;

[0028] Figure 3A cross-sectional view of the overall internal structure provided by an embodiment of the present invention;

[0029] Figure 4 A schematic diagram of the structure of a pressing component provided in an embodiment of the present invention;

[0030] Figure 5 A first cross-sectional view of the internal structure of a pressing assembly provided in an embodiment of the present invention;

[0031] Figure 6 A second cross-sectional view of the internal structure of the pressing assembly provided by an embodiment of the present invention;

[0032] Figure 7 A schematic diagram of the structure of a collecting plate provided in an embodiment of the present invention;

[0033] Figure 8 A schematic diagram of the push component structure provided by an embodiment of the present invention;

[0034] Fig. 9 A cross-sectional view of the internal structure of a pushing component provided in an embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 1. Base; 2. Pressing assembly; 3. Pushing assembly; 11. Protective plate; 21. Post; 211. Collecting plate; 212. Slide; 213. Pushing block; 214. Lead-out hole; 22. Screening cylinder; 221. Through hole; 23. Fixed block; 24. Support block; 25. Telescopic rod; 26. Fixed column; 27. Ring; 271. Limiting rod; 272. Elastic member; 28. Connecting block; 281. Movable rod; 29. ​​Arc plate; 31. Driving member; 32. Crankshaft; 33. Push rod; 34. Positioning block; 341. Guide groove; 342. Sliding block; 343. Driving rod; 344. Protective rod; 35. Adjusting block; 36. Connecting rod; 37. Adjusting rod; 38. Movable block; 39. Conveying block; 391. Feed hole; 392. Hole. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Example: See Figure 1-Figure 9 A plasma pulverized coal burner comprises a base 1, an upper end of the base 1 is provided with a pushing assembly 3, the pulverized coal is pushed to a designated position by the pushing assembly 3, and a protective plate 11 is provided at the edge portion of the upper end of the base 1.

[0040] In this solution, the pulverized coal is pushed into the burner by the pushing component 3. When the burner is activated, a proper amount of pulverized coal is stored inside the burner to enable it to burn fully.

[0041] Furthermore, the pressing assembly 2 is assembled at the upper end of the pushing assembly 3, and is used to further screen the coal powder; wherein the pressing assembly 2 includes a column 21, a screening cylinder 22 is provided at the end of the column 21, a fixing block 23 is provided on the inner wall of the screening cylinder 22, and the end of the fixing block 23 passes through and extends to the outside of the screening cylinder 22, and is connected to the end of the column 21.

[0042] In this embodiment, the inner cavity of the column 21 is provided with a device with power output such as a motor, and is connected to an external control device. At the same time, the output end of the motor is connected to the fixed block 23, so that when the motor is started, the fixed block 23 is synchronously driven to rotate.

[0043] The control device can select a single-chip microcomputer as the control end. In this embodiment, the single-chip microcomputer is a typical embedded microcontroller (Micro controller unit), which is composed of an arithmetic unit, a controller, a memory, an input and output device, etc., which is equivalent to a microcomputer. Compared with the general-purpose microprocessor used in personal computers, it emphasizes self-supply (no external hardware) and cost saving. Its biggest advantage is that it is small in size and can be placed inside the instrument, but it has a small storage capacity, a simple input and output interface, and low functional consumption.

[0044] Furthermore, a support block 24 is provided at one end of the fixed block 23 away from the column 21, and multiple groups of telescopic rods 25 are slidably installed on the outer surface of the support block 24, and the multiple groups of telescopic rods 25 are evenly distributed on the outer surface of the support block 24, and the ends of the telescopic rods 25 penetrate and extend into the interior of the support block 24.

[0045] Specifically, when the fixed block 23 rotates, the supporting block 24 is synchronously driven to rotate, so that the telescopic rod 25 arranged on the supporting block 24 rotates around the fixed block 23, wherein the outer surface of the supporting block 24 is provided with a slot, and the outer surface of the telescopic rod 25 is slidably connected to the inner wall of the slot, and at the same time, a baffle is provided at one end of the telescopic rod 25 in the inner cavity of the supporting block 24, and the telescopic rod 25 is protected by the baffle, thereby ensuring the overall stability of the telescopic rod 25.

[0046] Furthermore, a fixing column 26 is provided at one end of the support block 24 away from the fixing block 23, a circular ring 27 is slidably installed on the outer surface of the fixing column 26, a limiting rod 271 corresponding to the telescopic rod 25 is rotatably installed on the outer surface of the circular ring 27, a connecting block 28 corresponding to the limiting rod 271 is rotatably installed on the outer surface of the fixing column 26, a movable rod 281 is rotatably installed on the end of the connecting block 28, and the end of the limiting rod 271 away from the circular ring 27 is rotatably connected to the outer surface of the movable rod 281.

[0047] Specifically, when the ring 27 moves, the limiting rod 271 is synchronously driven to move. Since the end of the limiting rod 271 is rotatably connected to the outer surface of the movable rod 281, when the limiting rod 271 moves, the movable rod 281 is driven to rotate around the connecting block 28, thereby causing the end of the movable rod 281 to slowly expand outward.

[0048] Furthermore, an arc plate 29 is rotatably mounted on one end of the movable rod 281 away from the connecting block 28, the inner wall of the arc plate 29 is connected to the end of the telescopic rod 25, and the outer surface of the arc plate 29 is in contact with the inner wall of the screening cylinder 22. At the same time, an elastic member 272 is sleeved on the outer surface of the fixed column 26, and one end of the elastic member 272 is connected to the connecting block 28, and the other end is connected to the end of the ring 27. A collecting plate 211 is provided at one end of the column 21, and the collecting plate 211 is located at the lower end of the screening cylinder 22.

[0049] Specifically, when the movable rod 281 moves, the arc plate 29 rotatably mounted at its end is driven to move, thereby pressing the arc plate 29 tightly against the inner wall of the screening cylinder 22 and rotating along with the fixed block 23, thereby further screening the coal powder inside the screening cylinder 22 to avoid agglomeration of the coal powder and causing it to fall onto the collecting plate 211.

[0050] The elastic member 272 is an elastic member such as a spring, which is used to limit the ring 27 so that the ring 27 is always in a taut state and presses the arc plate 29 against the inner wall of the screening drum 22 .

[0051] Furthermore, the inner wall of the collecting plate 211 is symmetrically provided with a slide groove 212, and a push block 213 is slidably mounted on the inner wall of the slide groove 212, and a guide hole 214 is provided on the inner wall of the collecting plate 211. A through hole 221 is provided at the upper end of the outer surface of the screening cylinder 22.

[0052] Specifically, a magnetic block is provided at the lower end of the push block 213, and the coal powder falling on the collecting plate 211 is pushed to the outlet hole 214 by the push block 213, so that it falls inside the pushing component 3, which facilitates the pushing of the coal powder.

[0053] Furthermore, the pushing assembly 3 includes a driving member 31 connected to the protective plate 11, and the output end of the driving member 31 passes through and extends to the inside of the protective plate 11. At the same time, a crankshaft 32 is provided at the output end of the driving member 31, and a pair of push rods 33 are rotatably installed on the outer surface of the crankshaft 32.

[0054] In this embodiment, the driving member 31 is a device with power output such as a motor, and is connected to an external control device. When the driving member 31 is started, it synchronously drives the crankshaft 32 arranged at its output end to rotate. When the crankshaft 32 rotates, it drives the two push rods 33 to reciprocate, and the two push rods 33 extend and retract alternately.

[0055] Furthermore, a positioning block 34 is provided at the upper end of the base 1 , and a guide groove 341 is symmetrically provided in the inner cavity of the positioning block 34 . A slider 342 is slidably mounted on the inner wall of the guide groove 341 , and one end of the slider 342 is rotatably connected to the push rod 33 .

[0056] Specifically, when the push rod 33 moves, the slider 342 is driven to move on the guide groove 341. The slider 342 is limited by the guide groove 341 so that the slider 342 is always in a stable state when moving, thereby preventing the slider 342 from falling off when moving.

[0057] Further, a driving rod 343 is provided at one end of the slider 342 away from the push rod 33, and an adjusting block 35 is provided at the end of the driving rod 343. A protective rod 344 is rotatably installed on one side of the slider 342, and one end of the protective rod 344 away from the slider 342 is rotatably connected to the adjusting block 35 symmetrically arranged.

[0058] Specifically, when the slider 342 moves, the driving rod 343 is driven to move, and at the same time, the protective rod 344 installed on the side of the slider 342 is moved in coordination with the rotation. The adjusting block 35 is moved by the protective rod 344 and the driving rod 343, so that when the adjusting block 35 moves, the whole remains stable.

[0059] Furthermore, a connecting rod 36 is provided at the upper end of the adjusting block 35 , and the upper end of the connecting rod 36 is slidably connected to the lower end of the collecting plate 211 .

[0060] Specifically, when the adjusting block 35 moves, the connecting rod 36 can be driven to move synchronously, wherein a magnetic block is provided at the upper end of the connecting rod 36. At the same time, after the connecting rod 36 is fitted with the collecting plate 211, the magnetic block on the connecting rod 36 and the magnetic block at the lower end of the pushing block 213 are attracted to each other, so that when the connecting rod 36 moves, the pushing block 213 can be driven to move synchronously, thereby pushing the coal powder.

[0061] Furthermore, a conveying block 39 is provided at the upper end of the base 1 and on one side of the positioning block 34 , and a hole 392 is opened through one end of the conveying block 39 . At the same time, a feed hole 391 is opened at the upper end of the conveying block 39 , and the feed hole 391 is located at the lower end of the outlet hole 214 .

[0062] Specifically, after the coal powder on the collecting plate 211 enters the feed hole 391 , it evenly enters the interior of the conveying block 39 and enters the interior of the burner along the hole 392 .

[0063] Furthermore, a movable block 38 is slidably mounted on the inner wall of the hole 392 , an adjusting rod 37 is disposed at the end of the movable block 38 , and the end of the adjusting rod 37 is connected to the adjusting block 35 .

[0064] Specifically, the movable block 38 is cylindrical as a whole, and an annular groove is provided on the outer surface of the movable block 38. The coal powder is collected through the annular groove and pushed into the burner along the hole 392, which facilitates the use of the burner and ensures the normal operation of the burner.

[0065] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A plasma pulverized coal burner, characterized in that: It comprises a base (1), the upper end of the base (1) is provided with a pushing component (3), the coal powder is pushed to a designated position by the pushing component (3), and the edge portion of the upper end of the base (1) is provided with a protective plate (11); A pressing assembly (2), which is mounted on the upper end of the pushing assembly (3) and is used to further screen the coal powder; The pressing assembly (2) comprises a column (21), a screening cylinder (22) is arranged at the end of the column (21), a fixing block (23) is arranged on the inner wall of the screening cylinder (22), and the end of the fixing block (23) penetrates and extends to the outside of the screening cylinder (22) and is connected to the end of the column (21); A support block (24) is provided at one end of the fixed block (23) away from the column (21); a plurality of groups of telescopic rods (25) are slidably mounted on the outer surface of the support block (24); and the plurality of groups of telescopic rods (25) are evenly distributed on the outer surface of the support block (24); and ends of the telescopic rods (25) penetrate and extend into the interior of the support block (24); A fixing column (26) is provided at one end of the support block (24) away from the fixing block (23); a circular ring (27) is slidably mounted on the outer surface of the fixing column (26); a limiting rod (271) corresponding to the telescopic rod (25) is rotatably mounted on the outer surface of the circular ring (27); a connecting block (28) corresponding to the limiting rod (271) is rotatably mounted on the outer surface of the fixing column (26); a movable rod (281) is rotatably mounted on the end of the connecting block (28); and an end of the limiting rod (271) away from the circular ring (27) is rotatably connected to the outer surface of the movable rod (281); An arc plate (29) is rotatably mounted on one end of the movable rod (281) away from the connecting block (28), the inner wall of the arc plate (29) is connected to the end of the telescopic rod (25), the outer surface of the arc plate (29) is in contact with the inner wall of the screening cylinder (22), and an elastic member (272) is sleeved on the outer surface of the fixed column (26), one end of the elastic member (272) is connected to the connecting block (28), and the other end is connected to the end of the circular ring (27); A collecting plate (211) is provided at one end of the column (21), and the collecting plate (211) is located at the lower end of the screening cylinder (22).

2. A plasma pulverized coal burner according to claim 1, characterized in that: The inner wall of the collecting plate (211) is symmetrically provided with a sliding groove (212), and a push block (213) is slidably mounted on the inner wall of the sliding groove (212). Meanwhile, the inner wall of the collecting plate (211) is provided with a guide hole (214).

3. A plasma pulverized coal burner according to claim 1, characterized in that: A through hole (221) is provided at the upper end of the outer surface of the screening cylinder (22).

4. A plasma pulverized coal burner according to claim 1, characterized in that: The pushing assembly (3) comprises a driving member (31) connected to the protective plate (11), the output end of the driving member (31) passes through and extends into the interior of the protective plate (11), and a crankshaft (32) is provided at the output end of the driving member (31), and a pair of push rods (33) are rotatably mounted on the outer surface of the crankshaft (32).

5. A plasma pulverized coal burner according to claim 4, characterized in that: A positioning block (34) is provided at the upper end of the base (1), and a guide groove (341) is symmetrically provided in the inner cavity of the positioning block (34). A slider (342) is slidably mounted on the inner wall of the guide groove (341), and one end of the slider (342) is rotatably connected to the push rod (33).

6. A plasma pulverized coal burner according to claim 5, characterized in that: A driving rod (343) is provided at one end of the sliding block (342) away from the push rod (33), and an adjusting block (35) is provided at the end of the driving rod (343).

7. A plasma pulverized coal burner according to claim 6, characterized in that: A protection rod (344) is rotatably mounted on one side of the slider (342), and one end of the protection rod (344) away from the slider (342) is rotatably connected to a symmetrically arranged adjustment block (35).

8. The plasma pulverized coal burner according to claim 7, characterized in that: A connecting rod (36) is provided at the upper end of the adjusting block (35), and the upper end of the connecting rod (36) is slidably connected to the lower end of the collecting plate (211).

9. A plasma pulverized coal burner according to claim 8, characterized in that: A conveying block (39) is provided at the upper end of the base (1) and on one side of the positioning block (34); a hole (392) is provided through one end of the conveying block (39); and a feed hole (391) is provided at the upper end of the conveying block (39); the feed hole (391) is located at the lower end of the outlet hole (214).

10. The plasma pulverized coal burner according to claim 9, characterized in that: A movable block (38) is slidably mounted on the inner wall of the hole (392), an adjusting rod (37) is disposed at the end of the movable block (38), and the end of the adjusting rod (37) is connected to the adjusting block (35).

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