A high temperature reheater anti-wear device

Abstract

The present invention relates to a high-temperature reheater anti-wear device, which is used to prevent the wear of the metal tube of the high-temperature reheater heating surface near the soot blower, and comprises a hole-type pipe clamp, an anti-wear box and an anti-wear cover arranged on the metal tube of the high-temperature reheater heating surface, the metal tube comprises a plurality of furnace tubes arranged in parallel at equal intervals, each furnace tube comprises a U-shaped bend pipe section and a vertical pipe section arranged above it, the anti-wear box cover is arranged on the vertical pipe section near the soot blower, the anti-wear cover comprises a straight anti-wear cover and a 90° anti-wear cover, the straight anti-wear cover is arranged on the furnace tube of the innermost circle of the vertical pipe section near the soot blower, and the top is welded to the bottom of the hole-type pipe clamp, the 90° anti-wear cover is arranged on the furnace tube of the outermost circle of the U-shaped bend pipe section near the soot blower, and the top is welded to the bottom of the anti-wear box, and the anti-wear cover is fixed to the furnace tube through the anti-wear cover lap plate. Compared with the prior art, the present invention has the advantages of reducing the workload of unit maintenance and extending the service life of the metal tube.

Description

Technical Field

[0001] The invention relates to the field of anti-wear of thermal power plant equipment, in particular to an anti-wear device for a high-temperature reheater. Background Art

[0002] At present, the high-temperature reheater of the π-type boiler in a thermal power plant is usually arranged in the horizontal flue at the furnace outlet, which is a suspended tube screen structure. When the boiler is running, the heating surface of the high-temperature reheater will produce ash and coke, which will deteriorate the heat transfer. Therefore, a long telescopic rotary steam soot blower is installed near the heating surface to blow soot on the heating surface to clean it.

[0003] The sootblowing medium usually uses steam with a pressure of 1 to 1.5 MPa and a temperature of 350°C. The effective sweeping radius of the sootblower is about 1.5 to 2 meters. It uses the kinetic energy of the steam jet to blow the ash away from the heating surface. Therefore, while cleaning the heating surface, it also produces the adverse consequence of scouring and thinning the metal pipe wall. In response to this situation, the solution usually adopted is to install anti-wear tiles on the surface of some high-temperature reheater tubes in the sootblowing steam sweeping area. However, due to the small spacing between tubes, it is impossible to install anti-wear tiles on each tube in the tube row. Therefore, anti-wear tiles are generally only installed on the first tube of the outer circle on the side facing the sootblowing steam. And because the anti-wear tiles cannot wrap the entire circle of the tube, the anti-wear blind area is large and the effect is not ideal.

[0004] In addition, due to the unevenness of the tube panel (the panel-type heating surface arranged in the furnace), some tubes are out of the row, causing the out-of-row tubes to be eroded and worn. One of the main reasons for the unevenness of the tube panel is that the tube clamps of the original design of the tube panel have a short service life under the action of high-temperature flue gas. The tube clamp is a plate structure with a small fit with the tube, so the cooling effect obtained by the medium in the tube is poor. In addition, due to the thin wall thickness of the steel plate, the middle section of the tube clamp is relatively thin. Therefore, this plate-type tube clamp is prone to failure such as bending, cracking, and high-temperature burning after a period of operation.

[0005] In summary, the anti-wear tiles and plate-type pipe clamps currently used for the soot-blowing steam damage of the high-temperature reheater have large anti-wear blind areas and problems such as tube screen out of column due to failure of the tube clamps. Therefore, the range of damaged furnace tubes is large and the thinning rate is fast. At the same time, since the wall thickness of the high-temperature reheater tube is thin, generally 4 to 5 mm, it is easy to cause tube burst accidents, which brings hidden dangers to the safe operation of the unit and increases the maintenance workload. Summary of the invention

[0006] The purpose of the present invention is to provide a high-temperature reheater anti-wear device in order to overcome the defects of the above-mentioned prior art.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A high-temperature reheater anti-wear device is used to prevent the wear of the metal tube of the high-temperature reheater heating surface near the sootblower. The device includes a hole-type pipe clamp, an anti-wear box and an anti-wear cover arranged on the metal tube of the high-temperature reheater heating surface. The metal tube includes a plurality of furnace tubes arranged in parallel at equal intervals, each furnace tube includes a U-shaped bend pipe section and a vertical pipe section arranged above it. The hole-type pipe clamp is sleeved and clamped on the vertical pipe section of the metal tube. The anti-wear box cover is arranged on the vertical pipe section close to the sootblower. The anti-wear cover includes a 90° anti-wear cover arranged on the outermost furnace tube of the U-shaped bend pipe section close to the sootblower side and a straight anti-wear cover arranged on the innermost furnace tube of the vertical pipe section close to the sootblower side. The top of the 90° anti-wear cover is welded to the bottom of the anti-wear box, and the top of the straight anti-wear cover is welded to the bottom of the hole-type pipe clamp. The top of the anti-wear box is welded to the hole-type pipe clamp.

[0009] The hole-type pipe clamp comprises two symmetrically arranged clamping parts, the two clamping parts are respectively provided with a central connecting plate and a plurality of semicircular docking units arranged in parallel and symmetrically arranged on both sides of the central connecting plate, the central position of each semicircular docking unit is respectively provided with a semicircular hole for inserting each single furnace tube of the vertical pipe section, and the two clamping parts are provided with matching fittings, and after matching, a pipe clamp with a plurality of circular mounting holes is formed. The number of the semicircular docking units of each clamping part is the same as the number of the furnace tube body of the metal tube, and the size and shape of each semicircular hole are the same as the outer diameter size and cross-sectional shape of the furnace tube body of the metal tube. The matching fitting comprises a mounting bolt arranged between each semicircular docking unit of one clamping part and a mounting hole arranged on another clamping part for matching and connecting with the mounting bolt. The inner diameter size of the semicircular docking unit is the same as the outer diameter size of each single furnace tube of the vertical pipe section to be clamped.

[0010] Furthermore, the 90° anti-wear cover and the straight anti-wear cover are respectively fixed to the corresponding furnace tubes through anti-wear cover straps. The anti-wear cover straps are arc-shaped plate-like structures, and the inner diameter corresponding to the arc of the anti-wear cover straps is the same as the outer diameter of the furnace tube.

[0011] Furthermore, the device also includes a comb plate, which is installed at the center of the U-shaped bend pipe section. The comb plate includes a plate body and a plurality of elongated holes arranged in parallel at equal intervals and arranged at one end of the plate body, the number of the elongated holes is the same as the number of the furnace tubes of the metal tube, the spacing between the elongated holes is the same as the spacing between the furnace tubes of the metal tube, and the width of each elongated hole matches the outer diameter of each furnace tube of the metal tube.

[0012] The high-temperature reheater anti-wear device provided by the present invention has at least the following beneficial effects compared with the prior art:

[0013] 1) By installing the anti-wear device of the present invention on the metal tube, the erosion and wear of the furnace tube caused by the flue gas and the soot blower can be effectively reduced, the probability of the furnace tube of the unit being worn and bursting during operation can be reduced, and the maintenance workload of the unit can also be reduced.

[0014] 2) The use of hole-type pipe clamps can greatly improve the fit with the furnace tube and facilitate the cooling of the pipe clamps; the use of high-temperature resistant stainless steel can increase the strength; the structure of the hole-type pipe clamps is symmetrical, with fewer parts, which is convenient for on-site clamp-type installation, and is not prone to bending, cracking, high-temperature burning and other failures in high-temperature flue gas environments. After long-term use, it can prevent the tube panel from being out of the tube, effectively reduce the wear of the furnace tube by flue gas and the blown-off steam by soot blowing, thereby extending the service life.

[0015] 3) By installing a high-temperature resistant stainless steel anti-wear box on the metal pipe close to the soot blower and installing an anti-wear cover on the elbow at the bottom of the outer ring pipe, the furnace tubes within the range that is obviously damaged by the soot blower can be fully surrounded, avoiding the shortcomings of conventional anti-wear covers such as blind spots and easy falling off, thereby effectively avoiding furnace tube damage caused by the soot blower.

[0016] 4) Installing comb plates made of high-temperature resistant stainless steel at the U-bend section at the bottom of adjacent tube panels can make the spacing between adjacent tube panels uniform and effectively fixed, and prevent the excessive local flue gas flow velocity caused by uneven spacing between some tube panels, which leads to increased wear of tube panels with small spacing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the main structure of the high-temperature reheater anti-wear device in the embodiment;

[0018] Figure 2 It is a schematic diagram of the side structure of the high-temperature reheater anti-wear device in the embodiment;

[0019] Figure 3 It is a structural schematic diagram of the comb plate of the high-temperature reheater anti-wear device in the embodiment;

[0020] Figure 4 It is a schematic diagram of the main structure of the hole-type pipe clamp of the high-temperature reheater anti-wear device in the embodiment;

[0021] Figure 5 It is a schematic side view of the structure of the hole-type pipe clamp of the high-temperature reheater anti-wear device in the embodiment;

[0022] Figure 6 It is a schematic structural diagram of a straight anti-wear cover of a high-temperature reheater anti-wear device in an embodiment;

[0023] Figure 7 It is a schematic structural diagram of a 90° anti-wear cover of a high-temperature reheater anti-wear device in an embodiment;

[0024] Figure 8It is a schematic structural diagram of the anti-wear cover strapping plate of the high-temperature reheater anti-wear device in the embodiment;

[0025] Fig. 9 It is a schematic structural diagram of the anti-wear box of the anti-wear device for high-temperature reheater in the embodiment;

[0026] The numbers in the figure show:

[0027] 1. Hole-type pipe clamp, 11. Semicircular docking unit, 12. Circular mounting hole, 13. Mounting bolt, 2. Anti-wear box, 31. Straight anti-wear cover, 32. 90° anti-wear cover, 33. Anti-wear cover lap plate, 4. Comb plate, 41 plate body, 42. Long strip hole, 5. Soot blower, 6. Metal pipe, 61. Vertical pipe section, 62. U-shaped bend pipe section, 7. Horizontal flue. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should belong to the scope of protection of the present invention.

[0029] Example

[0030] The present invention relates to a high temperature reheater anti-wear device, which is installed on a metal tube 6 of the heating surface of the high temperature reheater, and a soot blower 5 is arranged near the high temperature reheater. The metal tube 6 includes a plurality of furnace tubes arranged in parallel at equal intervals. The metal tube 6 is arranged above a horizontal flue 7. Figure 1-2 As shown, the device includes a hole-shaped pipe clamp 1, an anti-wear box 2, an anti-wear cover 3 and a comb plate 4. Each single furnace tube of the metal tube 6 of the heating surface of the high-temperature reheater includes a U-shaped bend section 62 and a vertical pipe section 61 above the U-shaped bend section 62. A soot blower 5 is arranged near the vertical pipe section 61 on one side above the U-shaped bend section 62. The hole-shaped pipe clamp 1 is sleeved and clamped on the vertical pipe section 61 of the metal tube 6.

[0031] The anti-wear box 2 is a rectangular box with a hollow structure. Fig. 9 As shown. The anti-wear box 2 is covered on the vertical pipe section 61 near the soot blower 5, and the top of the anti-wear box 2 is welded to the bottom of the hole-shaped pipe clamp 1. Further, the height of the anti-wear box 2 is: the upper part of the anti-wear box 2 supports the hole-shaped pipe clamp 1, and the lower part reaches the bending point of the furnace pipe inside the U-shaped bending pipe section 62; the width of the anti-wear box 2 is: the anti-wear box 2 wraps all the vertical pipe sections 61 near the soot blower 5.

[0032] The anti-wear cover 3 includes a straight anti-wear cover 31, a 90° anti-wear cover 32 and an anti-wear cover strap 33. The straight anti-wear cover 31 is an open semicircular vertical tubular structure, which is set on the innermost furnace pipe of the vertical pipe section 61 near the soot blower 5. After covering the furnace pipe, the inner side of the open end is welded to the two ends of the anti-wear cover strap 33, so that the straight anti-wear cover 31 is close to the furnace pipe. The top of the straight anti-wear cover 31 is welded to the bottom of the hole-shaped pipe clamp 1 to prevent it from falling.

[0033] The 90° anti-wear cover 32 is a semi-enclosed tubular structure with a curved angle. Figure 7 As shown, it includes a straight section and an angled section, the arc of the angled section is 90 degrees, and the 90° anti-wear cover 32 is arranged on the outermost circle of the furnace tube on the side of the U-shaped bent pipe section 62 close to the soot blower 5 through the open end cover. After covering the furnace tube, the inner side of the open end is welded to the two ends of the anti-wear cover strap 33, so as to make it close to the furnace tube, and the top of the 90° anti-wear cover 32 is welded to the bottom of the anti-wear box 2 to prevent it from falling.

[0034] like Figure 8 As shown, the anti-wear cover strap 33 is an arc-shaped plate structure, and the inner diameter corresponding to the arc is the same as the outer diameter of the furnace tube, so that the inner side of the open end of the straight anti-wear cover 31 and the 90° anti-wear cover 32 can be stably welded with the anti-wear cover strap 33 to completely and tightly fit the furnace tube. Further, the height of the straight anti-wear cover 31: the upper part of the straight anti-wear cover 31 supports the hole-shaped pipe clamp 1, and the lower part reaches the bending point of the furnace tube inside the U-shaped bend section 62; the height of the 90° anti-wear cover 32: the upper part of the 90° anti-wear cover 32 supports the anti-wear box 2, and the lower part reaches the horizontal section of the furnace tube outside the U-shaped bend section 62 200mm past the bending point.

[0035] A comb plate 4 is installed at the center of the U-shaped curved pipe section 62. Figure 3 As shown, the comb-shaped plate 4 includes a plate body 41 and long strip holes 42 arranged in parallel at equal intervals, and each long strip hole 42 is arranged at one end of the plate body 41. The number of each long strip hole 42 is the same as the number of tube bodies of the metal tube 6, the spacing of each long strip hole 42 is the same as the spacing of multiple furnace tubes of the metal tube 6 arranged in parallel at equal intervals, and the width of each long strip hole 42 matches the outer diameter size of the multiple furnace tubes of the metal tube 6 arranged in parallel at equal intervals.

[0036] The hole-type pipe clamp 1 is a symmetrical structure, and is cast in a symmetrical shape during manufacture. Figure 4 , 5As shown, it specifically includes two symmetrically arranged clamping parts, the two clamping parts are respectively provided with a central connecting plate and a plurality of semicircular docking units 11 symmetrically arranged in parallel on both sides of the central connecting plate, the number of the semicircular docking units 11 of each clamping part is the same as the number of the furnace tube body of the metal tube 6; the central position of each semicircular docking unit 11 is respectively provided with a semicircular hole of the same size and shape, and the size and shape of each semicircular hole are the same as the outer diameter size and cross-sectional shape of the furnace tube body of the metal tube 6; after the two clamping parts are docked, a pipe clamp with a plurality of circular mounting holes 12 is formed. A mounting bolt 13 is respectively provided between each semicircular docking unit 11 of a clamping part, and the other clamping part is provided with a mounting hole for matching and connecting with the mounting bolt. After the two clamping parts are docked, a fixed connection is achieved through the mounting bolt 13 and the mounting hole. The inner diameter size of the semicircular docking unit 11 is the same as the outer diameter size of each single furnace tube of the vertical pipe section 61 to be clamped.

[0037] In this embodiment, as a preferred solution, the hole-shaped pipe clamp 1, the anti-wear box 2, the anti-wear cover 3 and the comb plate are all made of stainless steel.

[0038] The high-temperature reheater anti-wear device of the present invention can seal the furnace tubes within the effective blowing radius of the sootblower by adding anti-wear boxes and anti-wear covers, and simultaneously add anti-wear covers to the furnace tubes on the outermost circle of the metal tubes, which can effectively avoid the damage to the furnace tubes caused by the sootblower blowing; at the same time, the use of improved hole-type pipe clamps and the installation of sparse plates can prevent the tube panels from being out of the row and the uneven spacing between adjacent tube panels. This systematic high-temperature reheater anti-wear device can effectively reduce the erosion and wear of the furnace tubes caused by flue gas and sootblower, and extend the operating life of the high-temperature reheater tubes.

[0039] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A high-temperature reheater anti-wear device, used for anti-wearing a metal tube (6) on a heating surface of a high-temperature reheater near a soot blower (5), characterized in that: The invention comprises a hole-shaped pipe clamp (1), an anti-wear box (2) and an anti-wear cover (3) arranged on a metal pipe (6) on a heating surface of a high-temperature reheater, wherein the metal pipe (6) comprises a plurality of furnace pipes arranged in parallel at equal intervals, each furnace pipe comprises a U-shaped curved pipe section (62) and a vertical pipe section (61) arranged above the U-shaped curved pipe section, the hole-shaped pipe clamp (1) is sleeved on and clamped on the vertical pipe section (61) of the metal pipe (6), and the anti-wear box (2) covers the vertical pipe section (61) on one side close to the soot blower (5). 1), the anti-wear cover (3) comprises a 90° anti-wear cover (32) provided on the outermost furnace tube on the side of the U-shaped bend tube section (62) close to the soot blower (5), and a straight anti-wear cover (31) provided on the innermost furnace tube on the side of the vertical tube section (61) close to the soot blower (5), the top of the 90° anti-wear cover (32) being welded to the bottom of the anti-wear box (2), and the top of the straight anti-wear cover (31) being welded to the bottom of the hole-shaped pipe clamp (1); The device also includes a comb plate (4), wherein the comb plate (4) is installed at the center of the U-shaped curved pipe section (62); The hole-type pipe clamp (1) comprises two symmetrically arranged clamping parts, each of which is provided with a central connecting plate and a plurality of semicircular docking units (11) symmetrically arranged on both sides of the central connecting plate and arranged in parallel, each semicircular docking unit (11) is provided with a semicircular hole at the central position for inserting each single furnace pipe of the vertical pipe section (61), and the two clamping parts are provided with matching fittings, and after matching, a pipe clamp with a plurality of circular mounting holes (12) is formed.

2. The high temperature reheater anti-wear device according to claim 1, characterized in that: The top of the anti-wear box (2) is welded to the hole-shaped pipe clamp (1).

3. The high temperature reheater anti-wear device according to claim 1, characterized in that: The 90° anti-wear cover (32) and the straight anti-wear cover (31) are respectively fixed to corresponding furnace tubes via anti-wear cover straps (33).

4. The high temperature reheater anti-wear device according to claim 1, characterized in that: The comb-shaped plate (4) comprises a plate body (41) and a plurality of elongated holes (42) arranged in parallel at equal intervals and provided at one end of the plate body (41); the number of the elongated holes (42) is the same as the number of furnace tubes of the metal tube (6); the spacing between the elongated holes (42) is the same as the spacing between the furnace tubes of the metal tube (6); and the width of each elongated hole (42) matches the outer diameter of each furnace tube of the metal tube (6).

5. The high temperature reheater anti-wear device according to claim 1, characterized in that: The number of the semicircular docking units (11) of each clamping portion is the same as the number of the furnace tube body of the metal tube (6), and the size and shape of each semicircular hole are the same as the outer diameter size and cross-sectional shape of the furnace tube body of the metal tube (6).

6. The high temperature reheater anti-wear device according to claim 1, characterized in that: The matching fitting comprises a mounting bolt (13) arranged between the semicircular docking units (11) of one clamping part and a mounting hole arranged on the other clamping part for matching and connecting with the mounting bolt (13).

7. The high temperature reheater anti-wear device according to claim 1, characterized in that: The inner diameter of the semicircular docking unit (11) is the same as the outer diameter of each single furnace tube of the vertical tube section (61) to be clamped.

8. The high temperature reheater anti-wear device according to claim 3, characterized in that: The anti-wear cover strap (33) is an arc-shaped plate structure, and the inner diameter corresponding to the arc of the anti-wear cover strap (33) is the same as the outer diameter of the furnace tube.

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