Self-adjusting pulverized coal pipeline resistance adjuster and boiler system

Abstract

The invention provides a self-adjusting pulverized coal pipeline resistance adjuster and a boiler system, and belongs to the field of pulverized coal conveying, and the self-adjusting pulverized coal pipeline resistance adjuster comprises an adjuster switching pipeline, a plurality of supporting pipes, a rotor body provided with a plurality of rotor fan blades and two bearing seat assemblies; the rotating speed of the rotor body is designed to change along with the flow speed in the pulverized coal pipelines, so that the flow speed of wind powder in the pulverized coal pipelines is adjusted to be consistent. The boiler system comprises a grinding motor, a coal mill, a pulverized coal conveying pipeline, a resistance regulator and a boiler burner; and a resistance regulator is arranged on each pulverized coal conveying pipeline. Resistance balance of each pulverized coal pipeline at an outlet of a coal mill is realized through the self-adjusting pulverized coal pipeline resistance adjuster, the self-adjusting pulverized coal pipeline resistance adjuster can be suitable for various coal quality conditions, self-adjustment is realized, manual adjustment is not needed, the phenomenon of uneven combustion of a boiler is effectively improved, safe operation of the boiler and the combustion efficiency of the boiler are guaranteed, and energy consumption is reduced. The device can be popularized and applied in the field of pulverized coal conveying pipeline equipment.

Description

Technical Field

[0001] The invention belongs to the field of coal powder conveying pipeline equipment of a coal-fired power generation unit pulverizing system, and in particular relates to a self-adjusting coal powder pipeline resistance regulator and a boiler system. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art or prior art.

[0003] There are 4 to 6 pulverized coal pipes at the outlet of the traditional coal mill connected to the boiler burner. The resistance of each pulverized coal pipe is inconsistent, resulting in deviations in the pulverized coal concentration and the air-powder flow rate in each pulverized coal pipe, which in turn leads to unbalanced firepower of each burner of the boiler, overheating in some areas of the boiler, and brings hidden dangers to the safe operation of the boiler, while reducing the overall combustion efficiency of the boiler. The current solution to the inconsistency of the resistance of each pulverized coal pipe is to install an adjustable shrinkage hole on each pulverized coal pipe, adjust the adjustable shrinkage hole under cold conditions, and no longer adjust it after the resistance is leveled. The disadvantage of the adjustable shrinkage hole is that each adjustment is made under cold conditions, which is quite different from the actual operation. Secondly, the adjustable shrinkage hole needs to be readjusted every time the coal type is changed, and the adjustment process is complicated. After cold leveling, the deviation of each pulverized coal resistance during normal operation of the boiler often exceeds 10%, so the actual effect of the adjustable shrinkage hole is limited. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention aims to provide a self-adjusting pulverized coal pipeline resistance regulator and a boiler system, wherein the regulator can automatically adjust the resistance of the pulverized coal pipeline to ensure uniform heating of each area of ​​the boiler.

[0005] Overall solution: In order to solve the above problems, the overall design solution of this application is as follows.

[0006] A self-adjusting pulverized coal pipeline resistance regulator comprises a regulator adapter pipeline, a plurality of support tubes, a rotor body provided with a plurality of rotor blades and two sets of bearing seat assemblies; the plurality of support tubes are arranged at the inner diameters of both ends of the regulator adapter pipeline, one end of the radially arranged support tube is connected to the inner wall of the regulator adapter pipeline, the other end of the support tube is connected to the outer peripheral wall of the bearing seat assembly, and both ends of the rotating shaft of the rotor body are supported in the regulator adapter pipeline through the bearing seat assembly.

[0007] Furthermore, the blade height L of the rotor blades of the rotor body is designed to be in the range of 150 mm to 350 mm.

[0008] Furthermore, the blade torsion angle X° of the rotor blades of the rotor body is designed to be in the range of 5° to 11°.

[0009] Furthermore, the number of blades of the rotor blades of the rotor body is designed to range from 4 to 12.

[0010] Furthermore, adapter flanges are provided at both ends of the regulator adapter pipeline for connecting the regulator to the coal powder conveying pipeline of the coal mill.

[0011] Furthermore, the rotor body is designed to have a rotational speed that varies with the flow velocity in the pulverized coal pipeline, thereby adjusting the air-powder flow velocity in multiple pulverized coal pipelines to be consistent.

[0012] The present invention also provides a boiler system with uniform coal powder supply, the boiler system comprising a grinding motor, a coal mill, a coal powder conveying pipeline, a resistance regulator and a boiler burner; the coal mill is drivingly connected to the grinding motor, a plurality of coal powder conveying pipelines are arranged at the output end of the coal mill, the ends of the coal powder conveying pipelines are connected to the boiler burner, a resistance regulator is arranged on each of the coal powder conveying pipelines, and the resistance regulator adopts the aforementioned self-adjusting coal powder pipeline resistance regulator.

[0013] The beneficial effects of the present invention are as follows: compared with the existing adjustable shrinkage hole, the pulverized coal pipeline resistance regulator of the present application can achieve a resistance deviation of no more than 5% for each pulverized coal pipeline at the outlet of the coal mill, can be applied to various coal quality conditions, can adjust itself, does not require manual adjustment, effectively improves the phenomenon of uneven boiler combustion, ensures the safe operation of the boiler and guarantees the combustion efficiency of the boiler, and can be promoted and applied in the field of pulverized coal conveying pipeline equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the self-adjusting coal powder pipeline resistance regulator of the present invention;

[0015] Figure 2 for Figure 1 A cross-sectional view of

[0016] Figure 3 for Figure 1 A top view of

[0017] Figure 4 A schematic diagram of the boiler system.

[0018] In the figure,

[0019] 1. Regulator adapter pipe; 11. Adapter flange;

[0020] 2. Support pipe;

[0021] 3. Rotor body;

[0022] 4. Bearing seat assembly;

[0023] 10. Grinding motor;

[0024] 20. Coal mill; 30. Coal powder conveying pipeline;

[0025] 40. Resistance regulator;

[0026] 50. Boiler burner. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0028] Resistance adjuster

[0029] A self-adjusting pulverized coal pipeline resistance regulator, see Figure 1-Figure 3 , including a regulator adapter pipe 1, a plurality of support pipes 2, a rotor body 3 provided with a plurality of rotor blades and two sets of bearing seat assemblies 4.

[0030] Connection relationship: Multiple support tubes 2 are arranged at the inner diameter of the two ends of the regulator adapter pipe 1, one end of the radially arranged support tube 2 is connected to the inner wall of the regulator adapter pipe 1, and the other end of the support tube 2 is connected to the outer peripheral wall of the bearing seat assembly 4, and both ends of the rotating shaft of the rotor body 3 are supported in the regulator adapter pipe 1 through the bearing seat assembly 4.

[0031] In a specific example, three support pipes 2 are arranged at each end of the self-adjusting pulverized coal pipeline resistance regulator. One end of the support pipe 2 is welded to the inner wall of the regulator transfer pipeline 1, and the other end is welded to the outer ring of the bearing seat of the bearing seat assembly 4 to fix the upper and lower bearing seats.

[0032] When in use, the regulator is installed on the coal pulverized coal outlet pipe of the coal mill (see Figure 4 The bearing seat assembly 4 can be a conventional bearing seat, and bearing support end shaft sections are arranged at both ends of the rotor shaft for sleeve-mounting the bearing seat assembly 4 on the outer periphery.

[0033] The design range of the blade height L of the rotor blade of the rotor body 3 is 150 mm to 350 mm. The blade height L should not be too small or too large. The blade height is designed according to the thickness of the pipeline and the air volume. If L is too small, it will not increase the resistance. If L is too large, the resistance will be increased too much, the system kinetic energy loss will be too large, and the burden of the booster fan will be increased.

[0034] The blade twist angle X° of the rotor blades of the rotor body 3 is designed to be in the range of 5° to 11°. If the blade twist angle is too small, it will not play a role in adjusting the resistance, and if the twist angle is too large, the resistance will be too large, resulting in excessive kinetic energy loss of the system.

[0035] The number of blades of the rotor blades of the rotor body 3 is designed to be in the range of 4 to 12. If the number of blades of the rotor body is too large, the resistance is too large, which seriously affects the air powder flow rate and is not conducive to boiler combustion; if the number of blades is too small, a larger blade torsion angle is required, and a large torsion angle increases the degree of pipe wear and has poor economic efficiency.

[0036] Wherein, adapter flanges 11 are arranged at both ends of the regulator adapter pipeline 1 for connecting the regulator to the coal powder conveying pipeline of the coal mill.

[0037] The rotor body 3 is designed to have a rotational speed that varies with the flow rate in the pulverized coal pipeline, thereby adjusting the air-powder flow rate in multiple pulverized coal pipelines to be consistent.

[0038] Specifically, the same coal mill has 4 to 6 coal powder pipelines, and the resistance of each coal powder pipeline is inconsistent. According to the fluidity characteristics of the fluid, the air and powder will flow into the coal powder pipeline with smaller resistance, resulting in a faster air and powder flow rate in the coal powder pipeline with smaller resistance. The faster the air and powder flow rate drives the rotor body 3 to rotate faster. The faster the rotor body rotates, the greater the resistance of the regulator. The increase in the resistance of the regulator reduces the air and powder flow rate in the coal powder pipeline until it is consistent with the air and powder flow rate in other coal powder pipelines with larger resistance at the coal mill outlet, thereby achieving a balance.

[0039] Boiler system

[0040] A boiler system with uniform supply of pulverized coal, see Figure 4 The boiler system includes a pulverizing motor 10, a coal mill 20, a pulverized coal conveying pipeline 30 (there are generally 4 to 6 pulverized coal conveying pipes at the outlet of the coal mill), a resistance regulator 40 and a boiler burner 50; the coal mill 20 is drivingly connected to the pulverizing motor 10, a plurality of pulverized coal conveying pipelines 30 are arranged at the output end of the coal mill 20, the ends of the pulverized coal conveying pipelines 30 are connected to the boiler burner 50, and a resistance regulator 40 is arranged on each of the pulverized coal conveying pipelines 30, and the resistance regulator 40 adopts the aforementioned self-adjusting pulverized coal pipeline resistance regulator.

[0041] When the air powder passes through the resistance regulator 40, the coal powder impacts the rotor blades of the rotor body 3, thereby driving the rotor blades to rotate with the rotating shaft. Before the regulator is installed, when the coal mill 20 is operating normally, due to the inconsistent resistance in each coal powder conveying pipeline 30, the pressure in each coal powder conveying pipeline 30 is inconsistent, so the air powder flow rate in each coal powder conveying pipeline 30 is also inconsistent. The air powder flow rate in the coal powder conveying pipeline 30 with small pipeline resistance is fast, and vice versa, the air powder flow rate is slow. After the regulator is installed, if the flow rate in the coal powder conveying pipeline is fast, the rotation speed of the rotor body of the regulator increases, the resistance of the regulator increases, and then the air powder flow rate in the coal powder conveying pipeline is reduced until it is consistent with the air powder flow rate in other coal powder conveying pipelines at the outlet of the coal mill 20. At this time, the resistance of all coal powder conveying pipelines is balanced, and the amount of coal powder delivered to the boiler burner is almost equal, which ultimately ensures that all areas of the boiler are heated evenly.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-adjusting pulverized coal pipeline resistance regulator, characterized in that: It comprises a regulator adapter pipe (1), a plurality of support pipes (2), a rotor body (3) provided with a plurality of rotor blades, and two sets of bearing seat assemblies (4); A plurality of support tubes (2) are arranged at the inner diameter of both ends of the regulator adapter pipe (1); one end of the radially arranged support tube (2) is connected to the inner wall of the regulator adapter pipe (1); the other end of the support tube (2) is connected to the outer peripheral wall of the bearing seat assembly (4); and both ends of the rotating shaft of the rotor body (3) are supported in the regulator adapter pipe (1) via the bearing seat assembly (4).

2. The self-adjusting pulverized coal pipeline resistance regulator according to claim 1 is characterized in that: The blade height L of the rotor blades of the rotor body (3) is designed to range from 150 mm to 350 mm.

3. The self-adjusting pulverized coal pipeline resistance regulator according to claim 1 is characterized in that: The blade torsion angle X° of the rotor blades of the rotor body (3) is designed to be in the range of 5° to 11°.

4. The self-adjusting pulverized coal pipeline resistance regulator according to claim 1 is characterized in that: The number of blades of the rotor blades of the rotor body (3) is designed to range from 4 to 12.

5. The self-adjusting pulverized coal pipeline resistance regulator according to claim 1 is characterized in that: Adapter flanges (11) are arranged at both ends of the regulator adapter pipeline (1) for connecting the regulator to the coal powder conveying pipeline of the coal mill.

6. The self-adjusting pulverized coal pipeline resistance regulator according to any one of claims 1 to 5, characterized in that: The rotor body (3) is designed to have a rotational speed that varies with the flow velocity in the pulverized coal pipeline, thereby adjusting the air-powder flow velocity in a plurality of pulverized coal pipelines to be consistent.

7. A boiler system with uniform supply of pulverized coal, characterized in that: The boiler system comprises a grinding motor (10), a coal mill (20), a pulverized coal conveying pipeline (30), a resistance regulator (40) and a boiler burner (50); the coal mill (20) is drivingly connected to the grinding motor (10), a plurality of pulverized coal conveying pipelines (30) are arranged at the output end of the coal mill (20), the ends of the pulverized coal conveying pipelines (30) are connected to the boiler burner (50), a resistance regulator (40) is arranged on each of the pulverized coal conveying pipelines (30), and the resistance regulator (40) adopts the self-adjusting pulverized coal pipeline resistance regulator according to any one of claims 1 to 6.

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