A device for reducing the wear of the smoke tube bundle of the air preheater of a circulating fluidized bed boiler

Abstract

The utility model provides a device for reducing the wear of the smoke tube bundle of the air preheater of a circulating fluidized bed boiler, and relates to the technical field of circulating fluidized bed boilers, including a boiler rear flue; a boiler air preheater; an air preheater tube sheet; an air preheater smoke tube bundle; an air preheater smoke tube bundle anti-wear joint; the boiler rear flue is arranged at the rear side of the boiler; the boiler air preheater is arranged inside the boiler rear flue; the air preheater tube sheet is arranged at the upper, middle and lower parts of the boiler air preheater; the air preheater smoke tube bundle is arranged inside the boiler air preheater; the air preheater smoke tube bundle anti-wear joint is arranged at the upper part of the air preheater tube sheet. In the utility model, the existing circulating fluidized bed boiler air preheater smoke tube bundle can be solved to solve the phenomenon of smoke / air "inter-channeling" caused by smoke dust wear and penetration.

Description

Technical Field

[0001] The utility model belongs to the technical field of circulating fluidized bed boilers, and more specifically, particularly relates to a device for reducing the wear of smoke tube bundles of air preheaters of circulating fluidized bed boilers. Background Art

[0002] Circulating fluidized bed boiler is a high-efficiency combustion facility that has emerged in recent years. It was first developed by Finland's Ahlstrom Company and put into commercial operation in 1979. my country developed the first circulating fluidized bed boiler in 1987 and began to enter a period of vigorous development; 75t / h circulating fluidized bed medium-pressure steam boiler is a common model of circulating fluidized bed boilers. This boiler has the advantages of high degree of automation, friendly production and operation environment, high boiler efficiency, safety and environmental protection. Its main structural form is shown in the attached figure; circulating fluidized bed boiler is different from other types of boilers such as chain boilers, gas boilers, and oil boilers. The non-burned materials generated by this type of boiler during the combustion process are all micron-sized dust, and the generated dust is carried along with the boiler smoke. The hot flue gas is discharged from the boiler together with the smoke and is collected by the subsequent flue gas dust removal facilities. According to investigations and studies, in the actual operation of this type of boiler, there are many cases where the air preheater smoke tube bundle is worn and penetrated by smoke dust, resulting in the phenomenon of flue gas / air "inter-flow". The new air preheater smoke tube bundle is worn and penetrated every 2 to 3 years of operation, and the wear and penetration occurs mainly on the air preheater smoke tube bundle within 100 mm below the first tube plate of the hot flue gas inlet air preheater. The reasons are analyzed as follows: First, the flue gas temperature at the air preheater is relatively low (130 to 200 ° C), and the dust hardness increases, which is easy to cause wear of the smoke tube bundle; second, when the hot flue gas just starts to enter the air preheater, the flow state is relatively more turbulent, which accelerates the wear of the smoke tube bundle. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a device for reducing the wear of the smoke tube bundle of the air preheater of a circulating fluidized bed boiler, so as to solve the problems raised in the background technology;

[0004] The utility model solves the problem of wear of the smoke tube bundle of the air preheater of the circulating fluidized bed boiler by the following specific technical means:

[0005] A device for reducing the wear of a smoke tube bundle of an air preheater of a circulating fluidized bed boiler comprises a boiler rear flue, a boiler air preheater, an air preheater tube sheet, an air preheater smoke tube bundle and an air preheater smoke tube bundle anti-wear joint; the boiler rear flue is arranged at the rear side of the boiler; the boiler air preheater is arranged inside the boiler rear flue; the air preheater tube sheet is arranged at the upper, middle and lower parts of the boiler air preheater; the air preheater smoke tube bundle is arranged inside the boiler air preheater; the air preheater smoke tube bundle anti-wear joint is arranged at the upper part of the air preheater tube sheet, and the air preheater smoke tube bundle anti-wear joint is welded to the air preheater tube sheet.

[0006] Furthermore; the air preheater smoke tube bundle anti-wear joint is composed of an air preheater smoke tube bundle anti-wear joint lining wear-resistant sleeve and an air preheater smoke tube bundle anti-wear joint outer sleeve; the preheater smoke tube bundle anti-wear joint lining wear-resistant sleeve is arranged on the upper part of the air preheater tube plate, and the air preheater smoke tube bundle anti-wear joint lining wear-resistant sleeve is sleeved inside the air preheater smoke tube bundle anti-wear joint outer sleeve.

[0007] Furthermore, the outer sleeve of the wear-resistant joint of the air preheater smoke tube bundle is welded on the air preheater tube plate.

[0008] Furthermore, the upper end of the wear-resistant sleeve of the lining of the air preheater smoke tube bundle wear-resistant joint and the outer sleeve of the air preheater smoke tube bundle wear-resistant joint are connected by continuous electric welding, and the lower end is non-closedly connected by spot electric welding.

[0009] Furthermore, the outer sleeve material of the wear-resistant joint of the air preheater smoke tube bundle is 20# steel.

[0010] Furthermore, the wear-resistant sleeve lining of the wear-resistant joint of the air preheater smoke tube bundle is made of manganese steel.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] 1. The production and installation process is simple, the inspection and maintenance frequency is low, the overall cost is low and the service life cycle is long.

[0013] 2. The installation method is reasonable, and it can be installed in one time without disassembly, which is safe and reliable.

[0014] 3. It can effectively solve the wear and penetration problem of the smoke tube bundle of the air preheater of a 75t / h circulating fluidized bed medium-pressure steam boiler (the utility model has been actually used for 7 years without any wear and penetration of the smoke tube bundle of the air preheater and can continue to operate), avoid shutdown due to abnormal working conditions of the air preheater, improve the economic operation efficiency of the boiler, and reduce the operating costs of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the boiler of the utility model;

[0016] Figure 2 It is an internal schematic diagram of a boiler air preheater of the utility model;

[0017] Figure 3 The utility model is Figure 2 The enlarged structural diagram of the A part is shown below;

[0018] In the figure, the corresponding relationship between the component names and the figure numbers is as follows:

[0019] 1. Flue duct at the rear of the boiler;

[0020] 2. Boiler air preheater;

[0021] 3. Air preheater tube sheet;

[0022] 4. Air preheater smoke tube bundle;

[0023] 5. Anti-wear joints of air preheater smoke pipe bundle;

[0024] 6. The wear-resistant sleeve is lined on the anti-wear joint of the air preheater smoke tube bundle;

[0025] 7. Outer sleeve of anti-wear joint of air preheater smoke tube bundle; DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with specific embodiments, and the advantages and features of the present invention will become clearer as the description progresses; however, these embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention; those skilled in the art should understand that the details and forms of the technical solutions of the present invention may be modified or replaced without departing from the spirit and scope of the present invention, but these modifications and replacements all fall within the protection scope of the present invention;

[0027] Example:

[0028] As attached Figure 1 To Attachment Figure 3 As shown:

[0029] The utility model provides a device for reducing the wear of a smoke tube bundle of an air preheater of a circulating fluidized bed boiler, comprising a boiler rear flue 1, a boiler air preheater 2, an air preheater tube sheet 3, an air preheater smoke tube bundle 4 and an air preheater smoke tube bundle anti-wear joint 5; the utility model is characterized in that: the boiler rear flue 1 is arranged at the rear side of the boiler; the boiler air preheater 2 is arranged inside the boiler rear flue 1; the air preheater tube sheet 3 is arranged at the upper, middle and lower parts of the boiler air preheater 2; the air preheater smoke tube bundle 4 is arranged inside the boiler air preheater 2; the air preheater smoke tube bundle anti-wear joint 5 is arranged at the upper part of the air preheater tube sheet 3, and the air preheater smoke tube bundle anti-wear joint 5 is welded to the air preheater tube sheet 3.

[0030] Among them, the air preheater smoke tube bundle anti-wear joint 5 is composed of an air preheater smoke tube bundle anti-wear joint lining wear-resistant sleeve 6 and an air preheater smoke tube bundle anti-wear joint outer sleeve 7; the preheater smoke tube bundle anti-wear joint lining wear-resistant sleeve 6 is arranged on the upper part of the air preheater tube plate 3, and the air preheater smoke tube bundle anti-wear joint lining wear-resistant sleeve 6 is sleeved inside the air preheater smoke tube bundle anti-wear joint outer sleeve 7.

[0031] Among them, the outer sleeve 7 of the anti-wear joint of the air preheater smoke tube bundle is welded on the air preheater tube plate 3.

[0032] Among them, the upper ends of the wear-resistant sleeve lining 6 of the air preheater smoke tube bundle wear-resistant joint and the outer sleeve 7 of the air preheater smoke tube bundle wear-resistant joint are connected by continuous electric welding, and the lower ends are non-closedly connected by spot electric welding.

[0033] Among them, the outer sleeve 7 of the anti-wear joint of the air preheater smoke tube bundle is made of 20# steel.

[0034] Among them, the wear-resistant sleeve 6 of the wear-resistant joint lining of the air preheater smoke tube bundle is made of manganese steel.

[0035] The specific usage and function of this embodiment are as follows:

[0036] In the utility model; when the circulating fluidized bed medium-pressure steam boiler is shut down for maintenance, as shown in the attached drawings, the outer sleeve 7 of the air preheater smoke tube bundle anti-wear joint and the 110-150mm air preheater smoke tube bundle anti-wear joint lining wear-resistant sleeve 6 (wall thickness is 2-4mm) are cut, and the air preheater smoke tube bundle anti-wear joint lining wear-resistant sleeve 6 is inserted into the outer sleeve 7 of the air preheater smoke tube bundle anti-wear joint, the upper end is continuously welded by electric welding, and the lower end is spot welded by electric welding to make the air preheater smoke tube bundle anti-wear joint 5. Open the manhole door of the flue 1 at the rear of the boiler, enter the upper part of the boiler air preheater 2 and clean up all impurities such as dust and iron filings, and install the anti-wear joint 5 of the air preheater smoke pipe bundle on the uppermost air preheater tube plate 3 by continuous welding with electric welding. Before installation and welding, ensure that the anti-wear joint 5 of the air preheater smoke pipe bundle coincides with the center line of the air preheater smoke pipe bundle 4. By installing the anti-wear joint 5 of the air preheater smoke pipe bundle, the easily worn position of the entire air preheater smoke pipe bundle 4 is moved up to the anti-wear joint 5 of the air preheater smoke pipe bundle, and finally solves the problem of wear and penetration of the circulating fluidized bed boiler air preheater bundle.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for reducing wear of a smoke tube bundle of an air preheater of a circulating fluidized bed boiler, comprising a boiler rear flue (1), a boiler air preheater (2), an air preheater tube sheet (3), an air preheater smoke tube bundle (4) and an air preheater smoke tube bundle anti-wear joint (5); characterized in that: The boiler rear flue (1) is arranged at the rear side of the boiler; the boiler air preheater (2) is arranged inside the boiler rear flue (1); the air preheater tube sheet (3) is arranged at the upper, middle and lower parts of the boiler air preheater (2); the air preheater smoke tube bundle (4) is arranged inside the boiler air preheater (2); the air preheater smoke tube bundle anti-wear joint (5) is arranged at the upper part of the air preheater tube sheet (3), and the air preheater smoke tube bundle anti-wear joint (5) is welded to the air preheater tube sheet (3).

2. The device for reducing wear of smoke tube bundles of air preheaters of circulating fluidized bed boilers according to claim 1, characterized in that: The air preheater smoke tube bundle anti-wear joint (5) is composed of an air preheater smoke tube bundle anti-wear joint lining wear-resistant sleeve (6) and an air preheater smoke tube bundle anti-wear joint outer sleeve (7); the air preheater smoke tube bundle anti-wear joint lining wear-resistant sleeve (6) is arranged on the upper part of the air preheater tube plate (3), and the air preheater smoke tube bundle anti-wear joint lining wear-resistant sleeve (6) is sleeved inside the air preheater smoke tube bundle anti-wear joint outer sleeve (7).

3. The device for reducing wear of smoke tube bundles of air preheaters of circulating fluidized bed boilers according to claim 2, characterized in that: The air preheater smoke tube bundle anti-wear joint outer sleeve (7) is welded to the air preheater tube plate (3).

4. The device for reducing wear of smoke tube bundles of air preheaters of circulating fluidized bed boilers according to claim 3, characterized in that: The upper ends of the wear-resistant sleeve (6) of the wear-resistant joint lining of the air preheater smoke tube bundle and the outer sleeve (7) of the wear-resistant joint of the air preheater smoke tube bundle are connected by continuous electric welding, and the lower ends are connected by spot electric welding in a non-closed manner.

5. The device for reducing wear of smoke tube bundles of air preheaters of circulating fluidized bed boilers according to claim 4, characterized in that: The outer sleeve (7) of the anti-wear joint of the air preheater smoke tube bundle is made of 20# steel.

6. The device for reducing wear of smoke tube bundles of air preheaters of circulating fluidized bed boilers according to claim 4, characterized in that: The wear-resistant sleeve (6) lining the wear-resistant joint of the air preheater smoke tube bundle is made of manganese steel.

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