Wear-resistant elbow for conveying pulverized coal for fluidized bed boiler

Abstract

The utility model discloses a wear-resistant pulverized coal conveying elbow for a fluidized bed boiler, which comprises an elbow piece, a wear-resistant layer is arranged on the inner surface of the elbow piece, a first positioning ring is sleeved at one end of the elbow piece, a screening pipe is arranged at one end of the elbow piece, and a second positioning ring is fixedly sleeved at one end of the screening pipe. A plurality of first arc-shaped blocks are arranged on the outer wall of the first positioning ring, an auxiliary barrel is arranged at one end of the screening pipe, a corrugated pipe is arranged at one end of the auxiliary barrel, the wear-resisting layer, the first positioning ring, the screening pipe, the auxiliary barrel, the corrugated pipe, an impurity filtering box and a leakage hole are arranged, and the wear-resisting layer is made of high-chromium cast iron, so that the hardness and wear resistance of the elbow piece are enhanced; after the screening pipe and the elbow piece are installed, the service life of the elbow piece is prolonged, the corrugated pipe is formed by combining foldable corrugated pieces, and the corrugated pipe can be extended and compressed, so that the impurity filtering box swings in the screening pipe in a small range, and the contact area between large-particle impurities and a plurality of leaking holes is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to fluidized bed boiler technical field especially relates to a fluidized bed boiler is with coal powder conveying elbow of wear resistance. BACKGROUND

[0002] Fluidized bed boiler is a kind of through airflow and make fuel particles suspend in airflow in the boiler form, this way can improve the combustion efficiency of fuel and heat exchange efficiency, fluidized bed boiler is widely used in industrial field, fluidized bed boiler in combustion process, coal powder is sent into hearth as fuel, and coal powder conveying system includes elbow, for conveying coal powder from coal powder bin and coal mill to hearth.

[0003] Coal powder often contains certain residue, and the particle of residue is larger, large particle impurities can cause greater impact and friction to the inner wall of elbow in the transportation process, large particle impurities are easily blocked in elbow part, elbow part is not easy to clean, also can cause abrasion to the inner wall of elbow, shortens the service life of elbow, for this, design a kind of fluidized bed boiler is with coal powder conveying elbow of wear resistance. UTILITY MODEL CONTENT

[0004] The utility model discloses a kind of fluidized bed boiler is with coal powder conveying elbow of wear resistance, to solve the problem that large particle impurities are easily blocked in elbow part in the above background art, elbow part is not easy to clean, also can cause abrasion to the inner wall of elbow.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of fluidized bed boiler is with coal powder conveying elbow of wear resistance, including elbow piece, the inner surface of the elbow piece is provided with wear layer, one end of the elbow piece is sleeved with first positioning ring, one end of the elbow piece is provided with screening pipe, one end of the screening pipe is fixedly sleeved with second positioning ring, the outer wall of the first positioning ring is provided with a plurality of first arc blocks, one end of the screening pipe is provided with auxiliary cylinder, one end of the auxiliary cylinder is provided with bellow, one end of the bellow is provided with filter box, the inner surface of the filter box is provided with a plurality of leakage holes.

[0006] As a preferred technical scheme of the utility model, one end of the screening pipe is provided with a plurality of auxiliary holes, one end of the auxiliary cylinder is fixedly sleeved with wrapping ring.

[0007] As a preferred technical scheme of the utility model, the outer wall of the wrapping ring is provided with a plurality of auxiliary blocks, one side of a plurality of the auxiliary blocks is provided with auxiliary strip, one end of a plurality of the auxiliary strips is respectively connected with the inside thread of a plurality of auxiliary holes.

[0008] As a preferred technical scheme of the utility model, a plurality of the auxiliary blocks are arranged at equidistant positions.

[0009] As a preferred technical scheme of the utility model, the outer wall of the second positioning ring is provided with a plurality of second arc-shaped blocks, and the corresponding first arc-shaped blocks and second arc-shaped blocks are all connected with the screw rod.

[0010] As a preferred technical scheme of the utility model, the two ends of the plurality of screw rods are all threadedly sleeved with the limiting nuts.

[0011] As a preferred technical scheme of the utility model, the first positioning ring is fixedly sleeved with one end of the elbow piece, and the diameter of the first positioning ring is equal to the diameter of the second positioning ring.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] 1. The utility model discloses a coal powder conveying wear-resistant elbow for a fluidized bed boiler, which is characterized by the wear-resistant layer, the first positioning ring, the screening pipe, the auxiliary cylinder, the corrugated pipe, the impurity filtering box and the leakage hole. The wear-resistant layer is made of high-chromium cast iron, thereby enhancing the hardness and wear resistance of the elbow piece. After the screening pipe and the elbow piece are installed, one side of the wrapping ring is tightly attached to one end of the screening pipe. The corrugated pipe and the impurity filtering box are inserted into the interior of the screening pipe. The plurality of leakage holes can filter the large-particle impurities in the coal powder, thereby avoiding the large-particle impurities from causing great impact and friction on the inner wall of the elbow piece during the conveying process, increasing the wear and extending the service life of the elbow piece. The corrugated pipe is composed of foldable corrugated sheets. When pressure is applied to the corrugated pipe, the corrugated pipe will be stretched and compressed, so that the impurity filtering box swings slightly in the interior of the screening pipe, thereby increasing the contact area between the large-particle impurities and the plurality of leakage holes.

[0014] 2. The utility model discloses a coal powder conveying wear-resistant elbow for a fluidized bed boiler, which is characterized by the screw rod, the limiting nut, the auxiliary strip and the auxiliary hole. After the first positioning ring and the second positioning ring are tightly attached, the screw rod is inserted into the interiors of the first arc-shaped block and the second arc-shaped block. The two limiting nuts are threadedly sleeved with the two ends of the screw rod, thereby limiting and fixing the elbow piece and the screening pipe. After one end of the plurality of auxiliary strips is embedded into the interior of the corresponding auxiliary hole, the two are threadedly connected, thereby installing the screening pipe and the auxiliary cylinder. The structure facilitates the disassembly of the screening pipe from one end of the elbow piece and the impurity filtering box from the interior of the screening pipe. DRAWINGS

[0015] Figure 1 It is a front view structural schematic diagram of the utility model;

[0016] Figure 2 It is a front view structural schematic diagram of the utility model; Figure 1 It is an enlarged view of A in the utility model;

[0017] Figure 3 It is a partial bottom view structural schematic diagram of the utility model;

[0018] Figure 4 The partial exploded view of the utility model.

[0019] In the figure: 1, elbow piece; 2, first positioning ring; 3, first arc block; 4, screening pipe; 5, second positioning ring; 6, second arc block; 7, screw rod; 8, limit nut; 9, auxiliary cylinder; 10, bellows; 11, impurity filtering box; 12, leakage hole; 13, wrapping ring; 14, auxiliary block; 15, auxiliary strip; 16, auxiliary hole. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0021] Please refer to Figures 1-4 The utility model provides a kind of coal powder conveying wear-resistant elbow for fluidized bed boiler technical scheme:

[0022] Embodiment one:

[0023] As Figures 1-3 shown, a kind of coal powder conveying wear-resistant elbow for fluidized bed boiler, including elbow piece 1, the inner surface of elbow piece 1 is provided with wear-resistant layer, one end of elbow piece 1 is sleeved with first positioning ring 2, one end of elbow piece 1 is provided with screening pipe 4, one end of screening pipe 4 is fixedly sleeved with second positioning ring 5, the outer wall of first positioning ring 2 is provided with multiple first arc blocks 3, one end of auxiliary cylinder 9 is provided with screening pipe 4, one end of auxiliary cylinder 9 is provided with bellows 10, one end of bellows 10 is provided with impurity filtering box 11, multiple leakage holes 12 are formed in the inner surface of impurity filtering box 11, bellows 10 and impurity filtering box 11 are inserted into the inside of screening pipe 4, multiple leakage holes 12 can filter large particle impurities in coal powder, avoid that large particle impurities cause greater impact and friction to the inner wall of elbow piece 1 in the conveying process, to increase wear, so as to prolong the service life of elbow piece 1, bellows 10 is combined by foldable corrugated sheet, when pressure is applied to it, bellows 10 will be extended and compressed, so that impurity filtering box 11 swings slightly in the inside of screening pipe 4.

[0024] Embodiment two:

[0025] On the basis of embodiment one, as Figure 1 and Figure 4As shown, the outer wall of the second positioning ring 5 is provided with a plurality of second arc blocks 6, the corresponding first arc blocks 3 and the second arc blocks 6 are both connected with the screw rod 7, after the first positioning ring 2 and the second positioning ring 5 are tightly attached, the screw rod 7 is sequentially inserted into the inside of the first arc block 3 and the second arc block 6, and the two limiting nuts 8 are threadedly sleeved with the two end portions of the screw rod 7, so that the elbow piece 1 and the screening pipe 4 can be limited and fixed.

[0026] Working principle: the fluidized bed boiler is a kind of boiler form that makes fuel particles suspended in the airflow by airflow, which can improve the combustion efficiency and heat exchange efficiency of the fuel, and the fluidized bed boiler is widely used in industrial field, in the combustion process of the fluidized bed boiler, the coal powder as fuel is sent into the furnace, and the coal powder conveying system includes an elbow for conveying the coal powder from the coal powder bin and the coal mill to the furnace, one end of the elbow piece 1 is connected with the furnace, and the other end is connected with the coal powder bin and the coal mill, the coal powder often contains a certain amount of residue, and the particles of the residue are large, the large particle impurities will cause great impact and friction on the inner wall of the elbow during the conveying process, the large particle impurities are easy to be blocked in the elbow part, the elbow part is not easy to clean, and the inner wall of the elbow will be worn, which shortens the service life of the elbow, therefore, the application discloses a fluidized bed boiler coal powder conveying wear-resistant elbow, the wear-resistant layer is made of high chromium cast iron, the hardness and wear resistance of the elbow piece 1 are enhanced, after the screening pipe 4 and the elbow piece 1 are installed, one side of the wrapping ring 13 is tightly attached with one end of the screening pipe 4, the corrugated pipe 10 and the impurity filtering box 11 are inserted into the inside of the screening pipe 4, a plurality of leakage holes 12 can filter the large particle impurities in the coal powder, so that the large particle impurities are prevented from causing great impact and friction on the inner wall of the elbow piece 1 during the conveying process, thereby increasing the wear, and the service life of the elbow piece 1 is prolonged, the corrugated pipe 10 is composed of foldable corrugated sheets, when pressure is applied to the corrugated pipe 10, the corrugated pipe 10 will be stretched and compressed, so that the impurity filtering box 11 swings in the inside of the screening pipe 4 with a small amplitude, the contact area between the large particle impurities and the plurality of leakage holes 12 is increased, after the first positioning ring 2 and the second positioning ring 5 are tightly attached, the screw rod 7 is sequentially inserted into the inside of the first arc block 3 and the second arc block 6, and the two limiting nuts 8 are threadedly sleeved with the two end portions of the screw rod 7, so that the elbow piece 1 and the screening pipe 4 can be limited and fixed, after one end of the plurality of auxiliary strips 15 is embedded into the inside of the corresponding auxiliary hole 16, the two are threadedly connected, so that the screening pipe 4 and the auxiliary cylinder 9 can be installed, through the structure, the screening pipe 4 can be separated from one end of the elbow piece 1, and the impurity filtering box 11 can also be separated from the inside of the screening pipe 4.

[0027] In the description of the utility model, it is understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0028] In the utility model, unless another explicit provision and limitation, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be two element internal communication or two element's mutual action relation, unless another explicit limitation, for ordinary skilled in the art, can be according to specific circumstances to understand the specific meaning of the above-mentioned terms in the utility model.

[0029] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A coal-pulverizing wear-resistant elbow for a fluidized bed boiler, comprising an elbow piece (1), characterized in that: The inner surface of the elbow piece (1) is provided with a wear-resistant layer, one end of the elbow piece (1) is sleeved with a first positioning ring (2), one end of the elbow piece (1) is provided with a screening pipe (4), one end of the screening pipe (4) is fixedly sleeved with a second positioning ring (5), the outer wall of the first positioning ring (2) is provided with a plurality of first arc-shaped blocks (3), one end of the screening pipe (4) is provided with an auxiliary cylinder (9), one end of the auxiliary cylinder (9) is provided with a bellows (10), one end of the bellows (10) is provided with a filter box (11), the inner surface of the filter box (11) is provided with a plurality of leakage holes (12).

2. A coal powder conveying wear-resistant elbow for fluidized bed boilers according to claim 1, characterized in that: One end of the screening pipe (4) is provided with a plurality of auxiliary holes (16), one end of the auxiliary cylinder (9) is fixedly sleeved with a wrapping ring (13).

3. A coal powder conveying wear-resistant elbow for fluidized bed boilers according to claim 2, characterized in that: The outer wall of the wrapping ring (13) is provided with a plurality of auxiliary blocks (14), one side of each of the plurality of auxiliary blocks (14) is provided with an auxiliary strip (15), and one end of each of the plurality of auxiliary strips (15) is respectively threadedly connected with the inside of the plurality of auxiliary holes (16).

4. A coal powder conveying wear-resistant elbow for fluidized bed boilers according to claim 3, characterized in that: The positions where the plurality of auxiliary blocks (14) are arranged are equidistantly arranged.

5. A coal powder conveying wear-resistant elbow for fluidized bed boilers according to claim 1, characterized in that: The outer wall of the second positioning ring (5) is provided with a plurality of second arc-shaped blocks (6), and the corresponding first arc-shaped blocks (3) and second arc-shaped blocks (6) are both connected with a screw rod (7).

6. A coal powder conveying wear-resistant elbow for fluidized bed boilers according to claim 5, characterized in that: Both ends of the plurality of screw rods (7) are threadedly sleeved with a limiting nut (8).

7. A coal powder conveying wear-resistant elbow for fluidized bed boilers according to claim 1, characterized in that: One end of the first positioning ring (2) is fixedly sleeved with the elbow piece (1), and the diameter of the first positioning ring (2) is equal to the diameter of the second positioning ring (5).

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