Pulverized coal conveying pipeline compensator

Abstract

The utility model relates to the technical field of pulverized coal conveying, in particular to a pulverized coal conveying pipeline compensator which comprises an outer guide cylinder, a left connecting pipe cylinder and a right connecting pipe cylinder, the left connecting pipe cylinder and the right connecting pipe cylinder are located in the left side direction and the right side direction of the outer guide cylinder, and second fillet limiting plates are welded to the left end of the outer surface of the outer guide cylinder and the left end of the outer surface of the right connecting pipe cylinder. Inner guide cylinders are welded to one sides of the two second fillet limiting plates correspondingly, and first fillet limiting plates are welded to the right end of the outer surface of the left connecting pipe cylinder and the right end of the outer surface of the outer guide cylinder correspondingly. Under the action of the inner guide cylinder, the inorganic fiber cotton and the wear-resistant lining, the compensator has the advantages of being good in compensation effect and resistant to wear and corrosion, and the problems that a spherical compensator is good in angular displacement compensation performance, common in axial and radial compensation performance and poor in sealing performance are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coal powder conveying, in particular to a coal powder conveying pipeline compensator. BACKGROUND

[0002] The coal powder conveying pipeline of the power plant is often in a high temperature environment, and there is a large temperature change in the pipeline when conveying the coal powder, and the pipe material will expand significantly when heated, which will cause a significant change in length. In addition, when the boiler starts, it will expand downward as a whole, and the coal powder pipe will also move downward at the same time. If an expansion joint is not provided, thermal stress will concentrate at the pipe fixing support, weld or flange, causing deformation, cracking or flange leakage of the pipeline.

[0003] Some coal powder conveying pipelines of power plants are connected by groove flexible pipe joints, and the single powder pipe is not provided with an effective expansion joint to eliminate stress. During system operation, the equipment vibrates greatly, the groove flexible pipe joint is loose and displaced, causing serious coal powder leakage. Moreover, it is difficult to repair, fasten and repair the groove flexible pipe joint, which has a great negative impact on safety production, equipment maintenance and environmental sanitation. The old coal powder conveying pipeline expansion compensation system uses a spherical compensator. The working principle of the spherical compensator is based on its unique spherical structure and dynamic sealing design. The displacement (such as thermal expansion, vibration or deformation caused by installation error) in the pipeline system is absorbed by the flexible movement of the ball, while the sealing of the medium is maintained. It has a certain multidirectional compensation capability.

[0004] At present, the coal powder conveying pipeline expansion compensation system is a key component in the coal-fired boiler or coal powder conveying system, which is mainly used to absorb the thermal expansion and contraction of the pipeline caused by temperature change, pressure fluctuation or mechanical vibration, so as to avoid stress concentration, deformation or leakage of the pipeline and ensure the safe and stable operation of the system. There are many types of compensators in the expansion compensation system, such as bellows compensator, sleeve compensator or spherical compensator. Each type is suitable for different scenes. The bellows compensator can absorb displacement in multiple directions, but the wear problem of coal powder needs to be considered. The spherical compensator has good angular displacement compensation performance, but the axial and radial compensation performance is general, and the sealing performance is poor. Therefore, we propose a coal powder conveying pipeline compensator. INVENTION CONTENTS

[0005] The utility model aims at providing a coal powder conveying pipeline compensator, which has the advantages of good compensation effect, wear resistance and corrosion resistance, and solves the problems of the spherical compensator, such as good angular displacement compensation performance, general axial and radial compensation performance, and poor sealing performance.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: a coal powder conveying pipeline compensator, including outer flow guide cylinder and left connecting pipe cylinder and right connecting pipe cylinder in the left and right two side directions of outer flow guide cylinder, the left end of outer surface of outer flow guide cylinder and the left end of outer surface of right connecting pipe cylinder all are welded with second round corner limit plate, the side of two second round corner limit plates all is welded with inner flow guide cylinder, the right end of outer surface of left connecting pipe cylinder and the right end of outer surface of outer flow guide cylinder all are welded with first round corner limit plate, the top fixed connection of first round corner limit plate and second round corner limit plate inside is connected with corrugated plate, the inorganic fibre cotton is filled between corrugated plate and inner flow guide cylinder, the inner wall of outer flow guide cylinder and left connecting pipe cylinder and right connecting pipe cylinder and inner flow guide cylinder all are welded with wear -resistant lining.

[0007] Preferably, the material of the corrugated plate is 316L stainless steel.

[0008] Preferably, the inner flow guide cylinder is made of 10mm carbon steel plate.

[0009] Preferably, the wear-resistant lining includes a plurality of arched ceramic pieces, the plurality of arched ceramic pieces are formed into a ring by an adjacent self-locking process, the thickness of the arched ceramic pieces is not less than 15mm, and the gap at the joint of the arched ceramic pieces is not greater than 0.1mm.

[0010] Preferably, the outer surface of the first round corner limit plate and the second round corner limit plate is welded with a reinforcing ring, and the outer end surface of the reinforcing ring is provided with a pull rod.

[0011] Preferably, the left and right ends of the outer surface of the pull rod are threadedly connected with a limiting nut and an adjusting nut around the two sides of the reinforcing ring.

[0012] Preferably, the right end of the outer surface of the left connecting pipe cylinder and the right end of the outer surface of the outer flow guide cylinder are provided with a blocking ring matched with the inner flow guide cylinder.

[0013] Compared with the prior art, the utility model has the beneficial effects as follows:

[0014] 1. The utility model discloses a full-height round corner double-wave metal compensator, which realizes that the maximum angular displacement of the compensator is not less than 5°, the axial displacement is not less than 100mm, and the radial displacement is not less than 330mm when the length of the compensator is about 2000mm.

[0015] 2. The compensator is provided with an anti-abrasion inner flow guide cylinder, and under the assistance of the wear-resistant lining, the direct scouring of coal powder on the inner wall of the compensator can be reduced, and the anti-abrasion performance of the compensator is further improved.

[0016] 3. The arched ceramic sheet of the wear-resistant lining of this utility model is tightly attached to the inner wall of the pipe. It is formed into a ring by an adjacent self-locking process and is positioned by welding ceramic. The gap at the splice of the arched ceramic sheet is no more than 0.1mm, ensuring that the ceramic material does not fall off during operation.

[0017] 4. This utility model uses inorganic fiber cotton as a filler, which can prevent coal dust from entering the corrugated plate without affecting the expansion performance of the compensator, so as to prevent affecting the compensation function of the compensator. Attached Figure Description

[0018] Figure 1 This is a first-view structural diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention from a second perspective;

[0020] Figure 3 This is an enlarged structural diagram of point A in this utility model;

[0021] Figure 4 This is a schematic diagram of the wear-resistant inner lining structure of this utility model.

[0022] In the diagram: 1. Left connecting tube; 2. Tie rod; 3. First rounded corner limiting plate; 4. Second rounded corner limiting plate; 5. Corrugated plate; 6. Outer guide tube; 7. Barrier ring; 8. Inner guide tube; 9. Right connecting tube; 10. Wear-resistant lining; 101. Arched ceramic plate; 11. Inorganic fiber cotton; 12. Adjusting nut; 13. Limiting nut; 14. Reinforcing ring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of the utility model, it is to explain, unless otherwise definite and limited, the term "link", "connection" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through the intermediate medium.

[0026] The left connecting pipe cylinder 1, the pull rod 2, the first fillet limiting plate 3, the second fillet limiting plate 4, the corrugated plate 5, the outer flow guide cylinder 6, the blocking ring 7, the inner flow guide cylinder 8, the right connecting pipe cylinder 9, the wear-resistant inner liner 10, the arched ceramic piece 101, the inorganic fiber cotton 11, the adjusting nut 12, the limiting nut 13 and the reinforcing ring 14 parts of the application are all general standard parts or parts known to those skilled in the art, and their structure and principle can be known by technical personnel through technical manual or through conventional experimental method.

[0027] Please refer to Figures 1-4 As shown in the figure, the utility model provides a technical scheme: a coal powder conveying pipeline compensator, including outer flow guide cylinder 6 and the left connecting pipe cylinder 1 and right connecting pipe cylinder 9 located in the direction of the left and right sides of outer flow guide cylinder 6, the left end of the outer surface of outer flow guide cylinder 6 and the left end of the outer surface of right connecting pipe cylinder 9 are all welded with second fillet limiting plate 4, one side of two second fillet limiting plates 4 is all welded with inner flow guide cylinder 8, inner flow guide cylinder 8 is made of 10mm carbon steel plate, the right end of the outer surface of left connecting pipe cylinder 1 and the right end of the outer surface of outer flow guide cylinder 6 are all welded with first fillet limiting plate 3, the top of the inner side of first fillet limiting plate 3 and second fillet limiting plate 4 is fixedly connected with corrugated plate 5, the material of corrugated plate 5 is 316L stainless steel, inorganic fiber cotton 11 is filled between corrugated plate 5 and inner flow guide cylinder 8, the inner wall of outer flow guide cylinder 6 and left connecting pipe cylinder 1 and right connecting pipe cylinder 9 and inner flow guide cylinder 8 are all welded with wear-resistant inner liner 10.

[0028] The technical scheme: through the setting of the first round corner limiting plate 3 and the second round corner limiting plate 4, the compensator is designed as a full-height round corner double-wave metal compensator, the corrugated peaks and valleys of the corrugated plate 5 adopt a round corner design (instead of a sharp corner), stress concentration can be reduced, and local fatigue cracking can be avoided, meanwhile, the double-wave structure of the compensator comprises two independent corrugated sections, the compensation capacity is stronger, the axial, lateral and angular displacement absorption of the compensator is more flexible, in the case that the length of the compensator is about 2000mm, the maximum angular displacement of the compensator is not less than 5°, the axial displacement is not less than 100mm, and the radial displacement is not less than 330mm, and after the left connecting pipe cylinder 1 and the right connecting pipe cylinder 9 are connected with the pulverized coal conveying pipeline, due to the high-speed movement of particles in the conveying process of the pulverized coal, impact and friction on the inner wall of the pipeline can be caused, and the inner guide cylinder 8 made of the wear-resistant lining 10 and the carbon steel plate can greatly reduce the internal wear of the compensator, thereby prolonging the service life of the compensator, the setting of the inorganic fiber cotton 11 can prevent the pulverized coal from entering the corrugated plate 5 without affecting the expansion performance of the compensator, so as to prevent the compensation function of the compensator from being affected, and the first round corner limiting plate 3 and the second round corner limiting plate 4 and the reinforcing ring 14 are fixed by welding, so that the connection strength of the compensator is improved.

[0029] The wear-resistant lining 10 comprises a plurality of arched ceramic pieces 101, the plurality of arched ceramic pieces 101 are formed into a ring by an adjacent self-locking process, the thickness of the arched ceramic pieces 101 is not less than 15mm, and the gap at the joint of the arched ceramic pieces 101 is not greater than 0.1mm.

[0030] The technical scheme: through the setting of the wear-resistant lining 10, compared with the common fixing method of traditional lining ceramics, which is to use an adhesive for pasting, when the pulverized coal pipeline conveys the pulverized coal, the ceramic pieces are prone to falling off due to high pipeline temperature and large vibration, in order to completely solve the problem of ceramic piece falling off, the arched ceramic pieces 101 of the lining of the compensator are closely attached to the inner wall of the pipeline, are formed into a ring by an adjacent self-locking process, and are additionally welded with ceramic positioning, the arched design can ensure that each ceramic piece is constrained in the radial and axial directions by adjacent pieces, the overall structure is compact and stable, and the ceramic material can be ensured not to fall off during operation.

[0031] The outer surfaces of the first round corner limiting plate 3 and the second round corner limiting plate 4 are welded with the reinforcing ring 14, and the outer end surface of the reinforcing ring 14 is provided with the pull rod 2.

[0032] The left and right ends of the outer surface of the pull rod 2 are respectively threadedly connected with the limiting nut 13 and the adjusting nut 12 around the two sides of the reinforcing ring 14.

[0033] The technical scheme: by limiting the cooperation of the nut 13 and the adjusting nut 12 with the pull rod 2, the axial and radial field requirements of the left connecting pipe cylinder 1 and the right connecting pipe cylinder 9 can be guaranteed when the compensator is used.

[0034] The right end of the outer surface of the left connecting pipe cylinder 1 and the right end of the outer surface of the outer flow guide cylinder 6 are both provided with a blocking ring 7 matched with the inner flow guide cylinder 8.

[0035] The technical scheme: by the setting of the blocking ring 7, the coal powder can be effectively blocked from entering the corrugated plate 5, and the normal use of the compensator is guaranteed.

[0036] Finally, it should be noted that the above examples are only used to illustrate the technical scheme of the present application, and are not a limitation on the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical scheme of the present application can be modified or replaced without departing from the essence and scope of the present application.

Claims

1. A coal powder conveying pipeline compensator comprising an outer guide cylinder (6) and a left connecting pipe cylinder (1) and a right connecting pipe cylinder (9) located on the left and right sides of the outer guide cylinder (6), characterized in that: The left end of the outer surface of the outer flow guide barrel (6) and the left end of the outer surface of the right connecting pipe barrel (9) are welded with second round corner limiting plates (4), one side of the two second round corner limiting plates (4) is welded with inner flow guide barrels (8), the right end of the outer surface of the left connecting pipe barrel (1) and the right end of the outer surface of the outer flow guide barrel (6) are welded with first round corner limiting plates (3), the top of the inner side of the first round corner limiting plate (3) and the second round corner limiting plate (4) is fixedly connected with corrugated plates (5), the corrugated plate (5) and the inner flow guide barrel (8) are filled with inorganic fiber cotton (11), and the inner walls of the outer flow guide barrel (6), the left connecting pipe barrel (1) and the right connecting pipe barrel (9) and the inner flow guide barrel (8) are welded with wear-resistant liners (10).

2. A coal dust conveying pipeline compensator according to claim 1, characterized in that: The material of the corrugated plate (5) is 316L stainless steel.

3. A coal dust conveying pipeline compensator according to claim 1, characterized in that: The inner flow guide barrel (8) is made of 10mm carbon steel plate.

4. A coal dust conveying pipeline compensator according to claim 1, characterized in that: The wear-resistant liner (10) comprises a plurality of arched ceramic pieces (101), the plurality of arched ceramic pieces (101) are formed into a ring by an adjacent self-locking process, the thickness of the arched ceramic piece (101) is not less than 15mm, and the gap at the joint of the arched ceramic piece (101) is not greater than 0.1mm.

5. A coal dust conveying pipeline compensator according to claim 1, characterized in that: The outer surface of the first round corner limiting plate (3) and the second round corner limiting plate (4) is welded with a reinforcing ring (14), and the outer end face of the reinforcing ring (14) is provided with a pull rod (2).

6. A coal dust conveying pipeline compensator according to claim 5, characterised in that: The left and right ends of the outer surface of the pull rod (2) around the two sides of the reinforcing ring (14) are respectively threadedly connected with limiting nuts (13) and adjusting nuts (12).

7. A coal dust conveying pipeline compensator according to claim 1, characterized in that: The right end of the outer surface of the left connecting pipe barrel (1) and the right end of the outer surface of the outer flow guide barrel (6) are provided with blocking rings (7) matched with the inner flow guide barrel (8).

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