A circulating fluidized bed boiler buried pipe with a heating surface provided with an anti-wear structure

Abstract

The utility model discloses a circulating fluidized bed boiler buried pipe with a heating surface provided with an anti-wear structure, and relates to the technical field of boiler heating surface anti-wear. It comprises a straight pipe section and a transition section, wherein the upper semicircular surface of the straight pipe section is provided with an anti-wear protective tile, and the lower semicircular surface is provided with a wear-resistant fin extending along the length direction of the straight pipe section; the wear-resistant fins are arranged at equal intervals on the lower semicircular surface of the straight pipe section, and the wear-resistant fins are arranged vertically on the lower semicircular surface, and an anti-wear retaining ring is arranged on the transition section, the inner surface of the anti-wear protective tile is fitted with the outer surface of the straight pipe section, the length of the anti-wear protective tile is greater than the width, the width of the wear-resistant fin is greater than the height, the inner surface of the anti-wear retaining ring is fitted with the outer surface of the transition section, and the length of the anti-wear retaining ring is less than the width. By adding protective devices of different types and arrangements to the heating surface of the buried pipe, the life of the buried pipe can be improved while effectively ensuring or even improving the heat absorption effect of the buried pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler heating surface anti-wear, in particular to a circulating fluidized bed boiler buried pipe with an anti-wear structure arranged on the heating surface. Background Art

[0002] In low circulation rate fluidized bed boilers, a large number of buried pipe heating surfaces are set in the furnace. For example, the utility model patent with publication number CN2494931Y discloses circulating arc-shaped buried pipes in fluidized bed boilers for lifting. In normal operation, the buried pipe heating surface in the furnace is immersed in high-temperature slag, and the slag is constantly flushed and heat-exchanged with the buried pipes, so the buried pipes are seriously worn. According to statistics from many years of operation, the cumulative operating life of each set of new buried pipes is about 23,000 hours, and the total cost of replacing buried pipes for each 75t / h furnace is about 500,000 yuan.

[0003] Therefore, if the heating surface of the buried boiler tube can be reinforced with anti-wear, and the wear of the heating surface of the buried tube can be reduced by adding anti-wear structure, the life of the buried tube can be increased. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the purpose of the utility model is to disclose a circulating fluidized bed boiler buried pipe with an anti-wear structure on the heating surface. By adding protective devices of different types and arrangements on the heating surface of the buried pipe, the service life of the buried pipe can be improved while effectively ensuring or even improving the heat absorption effect of the buried pipe.

[0005] To achieve the above-mentioned effect, the present application discloses a buried pipe of a circulating fluidized bed boiler having a wear-proof structure on the heating surface, the buried pipe comprising a straight pipe section and a transition section, the upper semicircular surface of the straight pipe section is provided with an anti-wear protective tile, the lower semicircular surface is provided with a wear-resistant fin extending along the length direction of the straight pipe section; the wear-resistant fins are arranged at equal intervals on the lower semicircular surface of the straight pipe section, the wear-resistant fins are arranged vertically on the lower semicircular surface, an anti-wear retaining ring is arranged on the transition section, the inner surface of the anti-wear protective tile is fitted with the outer surface of the straight pipe section, the length of the anti-wear protective tile is greater than the width, the width of the wear-resistant fin is greater than the height, the inner surface of the anti-wear retaining ring is fitted with the outer surface of the transition section, and the length of the anti-wear retaining ring is less than the width.

[0006] Furthermore, the transition section is an acute-angle elbow.

[0007] Furthermore, the anti-wear retaining ring on the acute-angle elbow comprises an inner retaining ring and an outer retaining ring, and the inner retaining ring and the outer retaining ring are arranged at intervals inside and outside the acute-angle elbow.

[0008] Furthermore, the transition section is composed of short straight pipes connected by obtuse angle elbows.

[0009] Furthermore, the anti-wear retaining ring on the obtuse-angle bend pipe includes an inner retaining ring and an outer retaining ring, and the inner retaining ring and the outer retaining ring are arranged at intervals inside and outside the obtuse-angle bend pipe. The anti-wear retaining ring on the short straight pipe includes an inner retaining ring and an outer retaining ring, and the inner retaining ring and the outer retaining ring are arranged one-to-one inside and outside the short straight pipe.

[0010] Furthermore, the curvature of the inner retaining ring is smaller than the curvature of the outer retaining ring.

[0011] Furthermore, the wear-resistant fins are iron-aluminum ceramic sheets, and the wear-resistant fins are fixed to the straight pipe sections by intermittent welding.

[0012] Furthermore, the anti-wear protective tiles are iron-aluminum-ceramic protective tiles, and the anti-wear protective tiles are welded to the wear-resistant fins.

[0013] Furthermore, the anti-wear retaining ring is a stainless steel retaining ring, and the anti-wear retaining ring is corner-welded to the transition section of the buried pipe.

[0014] The beneficial effects of the utility model include:

[0015] This technical improvement can effectively solve the problems of severe wear of the buried pipe heating surface, easy leakage and bursting, short service life, and high cost of maintenance and replacement of the heating surface. Practice has proved that the service life of the buried pipe improved by this technology can be extended by 60%-70%, and the economic losses caused by shutdown due to buried pipe leakage accidents can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is one of the common buried pipe structures in the prior art.

[0018] Figure 2 This is the second common buried pipe structure in the prior art.

[0019] Figure 3 The utility model is attached Figure 1 Anti-wear structure for the heating surface of the structural buried pipe.

[0020] Figure 4 For the utility model Figure 3 AA position profile.

[0021] Figure 5 For the utility model Figure 3 Zoomed in view of the circled location.

[0022] Figure 6 The utility model is attached Figure 2 Anti-wear structure for the heating surface of the structural buried pipe.

[0023] Figure 7 For the utility model Figure 6 Zoomed in view of the circled location.

[0024] Figure 8 For the utility model Figure 7 BB position profile.

[0025] Among them: 1. anti-wear protective tile, 2. wear-resistant fins, 3. anti-wear retaining ring, 31. inner retaining ring, 32. outer retaining ring, 100. straight pipe section, 200. transition section, 210. acute angle elbow, 220. obtuse angle elbow, 230. short straight pipe. DETAILED DESCRIPTION

[0026] The specific implementation methods of the utility model are further described in detail below in combination with the accompanying drawings. However, the following embodiments only list preferred embodiments, which only serve to explain and help understand the utility model and cannot be understood as limiting the utility model.

[0027] refer to Figure 1-7 A circulating fluidized bed boiler buried pipe with an anti-wear structure on the heating surface, the buried pipe comprising a straight pipe section 100 and a transition section 200, an anti-wear protective tile 1 is arranged on the upper semicircular surface of the straight pipe section, and a wear-resistant fin 2 extending along the length direction of the straight pipe section is arranged on the lower semicircular surface; the wear-resistant fins are arranged at equal intervals on the lower semicircular surface of the straight pipe section, and the wear-resistant fins are arranged vertically on the lower semicircular surface, an anti-wear retaining ring 3 is arranged on the transition section 200, the inner surface of the anti-wear protective tile 1 is in contact with the outer surface of the straight pipe section, the length of the anti-wear protective tile is greater than the width, the width of the wear-resistant fin 2 is greater than the height, the inner surface of the anti-wear retaining ring 3 is in contact with the outer surface of the transition section, and the length of the anti-wear retaining ring is less than the width.

[0028] In this scheme, the upper semicircular surface of the straight pipe section is provided with anti-wear tiles. The main function of this layout is to protect the straight pipe section from wear on the heating surface. The inner surface of the tiles fits the outer surface of the straight pipe section, which can provide good anti-wear performance.

[0029] The surface of the lower semicircle of the straight pipe section has wear-resistant fins extending along the length of the straight pipe section, which further strengthens the protection of the lower half. At the same time, these wear-resistant fins are arranged at equal intervals. This layout not only ensures that the wear-resistant fins can evenly withstand wear, but also effectively improves thermal efficiency. The wear-resistant fins are arranged vertically on the surface of the lower semicircle to achieve better heat dissipation. The transition section is also provided with an anti-wear retaining ring. The inner surface of the retaining ring fits the outer surface of the transition section to protect the transition section from wear. All these structural settings ensure that the boiler buried pipes can have a longer life in high temperature and high wear environments, and improve the overall operating efficiency of the boiler.

[0030] refer to Figure 3-5 As a preferred technical solution, the transition section 200 is a sharp-angle elbow 210. The anti-wear retaining ring 3 on the sharp-angle elbow 210 includes an inner retaining ring 31 and an outer retaining ring 32, and the inner retaining ring and the outer retaining ring are arranged at intervals inside and outside the sharp-angle elbow. The anti-wear retaining ring includes an inner retaining ring and an outer retaining ring, and these two parts are arranged inside and outside the sharp-angle elbow to play a dual protection role. The inner retaining ring mainly prevents direct wear on the inner wall of the elbow, and the outer retaining ring provides protection for the outer wall. Since the wear conditions of the inner and outer walls of the sharp-angle elbow may not be the same, the use of inner and outer retaining rings can be appropriately replaced according to the actual wear conditions, effectively improving the service life of the buried pipe.

[0031] refer to Figure 6-8 As another specific solution, the transition section 200 is composed of a short straight pipe 230 connected by an obtuse elbow 220. The anti-wear retaining ring 3 on the obtuse elbow 220 includes an inner retaining ring 31 and an outer retaining ring 32, and the inner retaining ring and the outer retaining ring are arranged at intervals inside and outside the obtuse elbow. The anti-wear retaining ring on the short straight pipe 230 includes an inner retaining ring 31 and an outer retaining ring 32, and the inner retaining ring and the outer retaining ring are arranged one by one inside and outside the short straight pipe. Anti-wear retaining rings are arranged on both the obtuse elbow and the short straight pipe, and the anti-wear retaining rings are composed of an inner retaining ring and an outer retaining ring. These two parts are respectively arranged on the inner and outer surfaces of the obtuse elbow and the short straight pipe, and also play the role of double protection inside and outside. As for the obtuse elbow, its internal and external pressures are relatively large, and the curved design also makes it subject to greater stress, so it needs internal and external protection to prevent wear. The short straight pipe generally bears direct impact force, so it is also necessary to be provided with an anti-wear retaining ring for protection.

[0032] More preferably, the curvature of the inner retaining ring is smaller than that of the outer retaining ring, so as to facilitate the fixing and installation of the inner retaining ring and the outer retaining ring, as well as the subsequent maintenance.

[0033] It is understandable to those skilled in the art that the wear-resistant fins are iron-aluminum ceramic sheets, and the wear-resistant fins are fixed to the straight pipe sections by intermittent welding. The wear-resistant protective tiles are iron-aluminum ceramic tiles, and the wear-resistant protective tiles are welded to the wear-resistant fins. The wear-resistant retaining rings are stainless steel retaining rings, and the wear-resistant retaining rings are angle-welded to the transition section of the buried pipe. The wear-resistant fins are made of iron-aluminum ceramic sheets, which have the good strength and toughness of iron, and aluminum and porcelain are added to improve the hardness and wear resistance of the fins, and better resist the impact of lamo. At the same time, they are intermittently welded to the straight pipe sections, which is significant in that while ensuring the tightness of the fins and the pipe sections, stress problems caused by excessive welding are prevented, thereby ensuring the service life of the fins.

[0034] The anti-wear tiles are made of iron-aluminum porcelain tiles. Like the wear-resistant fins, they have good strength and wear resistance, and are suitable for high temperature and high pressure environments. In addition, they are connected to the wear-resistant fins by welding. This connection method makes the anti-wear tiles and wear-resistant fins become one, enhancing their overall strength and improving the anti-wear effect.

[0035] Finally, stainless steel was chosen for the anti-wear retaining ring. This is because stainless steel has good heat resistance and corrosion resistance, and is suitable for long-term use in thermal environments such as boilers. The transition section between the retaining ring and the buried pipe is welded with fillet welding to enhance the firmness of the welding and effectively prevent the retaining ring from falling off during use.

[0036] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A circulating fluidized bed boiler buried pipe having a heating surface provided with an anti-wear structure, the buried pipe comprising a straight pipe section (100) and a transition section (200), characterized in that: An anti-wear tile (1) is arranged on the upper semicircular surface of the straight pipe section, and a wear-resistant fin (2) extending along the length direction of the straight pipe section is arranged on the lower semicircular surface; the wear-resistant fins are arranged at equal intervals on the lower semicircular surface of the straight pipe section, and the wear-resistant fins are arranged vertically on the lower semicircular surface; an anti-wear retaining ring (3) is arranged on the transition section (200); the inner surface of the anti-wear tile (1) is in contact with the outer surface of the straight pipe section, the length of the anti-wear tile is greater than the width, the width of the wear-resistant fin (2) is greater than the height, the inner surface of the anti-wear retaining ring (3) is in contact with the outer surface of the transition section, and the length of the anti-wear retaining ring is less than the width.

2. The buried pipe of a circulating fluidized bed boiler with a heating surface having an anti-wear structure according to claim 1, characterized in that: The transition section (200) is a sharp-angle elbow (210).

3. The buried pipe of a circulating fluidized bed boiler with a heating surface having an anti-wear structure according to claim 2, characterized in that: The anti-wear retaining ring (3) on the acute angle bend pipe (210) comprises an inner retaining ring (31) and an outer retaining ring (32), wherein the inner retaining ring and the outer retaining ring are arranged at intervals inside and outside the acute angle bend pipe.

4. The buried pipe of a circulating fluidized bed boiler with a heating surface having an anti-wear structure according to claim 1, characterized in that: The transition section (200) is composed of short straight pipes (230) connected by blunt-angle elbows (220).

5. The buried pipe of a circulating fluidized bed boiler with a heating surface having an anti-wear structure according to claim 4, characterized in that: The anti-wear retaining ring (3) on the obtuse angle elbow (220) comprises an inner retaining ring (31) and an outer retaining ring (32), the inner retaining ring and the outer retaining ring being arranged at intervals inside and outside the obtuse angle elbow, and the anti-wear retaining ring on the short straight pipe (230) comprises an inner retaining ring (31) and an outer retaining ring (32), the inner retaining ring and the outer retaining ring being arranged on the short straight pipe in a one-to-one correspondence inside and outside.

6. A circulating fluidized bed boiler buried pipe with a heating surface having an anti-wear structure according to claim 3 or 5, characterized in that: The curvature of the inner retaining ring is smaller than that of the outer retaining ring.

7. The buried pipe of a circulating fluidized bed boiler with a heating surface having an anti-wear structure according to claim 1, characterized in that: The wear-resistant fins are iron-aluminum ceramic sheets, and the wear-resistant fins are fixed to the straight pipe sections by intermittent welding.

8. The buried pipe of a circulating fluidized bed boiler with a heating surface having an anti-wear structure according to claim 1, characterized in that: The anti-wear protective tiles are iron-aluminum-ceramic protective tiles, and the anti-wear protective tiles are welded to the wear-resistant fins.

9. The buried pipe of a circulating fluidized bed boiler with a heating surface provided with an anti-wear structure according to claim 1, characterized in that: The anti-wear retaining ring is a stainless steel retaining ring, and the anti-wear retaining ring is corner-welded to the transition section of the buried pipe.

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