Expansion device for slag discharge pipe of CFB (circulating fluid bed) boiler

Abstract

The utility model relates to a CFB boiler deslagging pipe expansion device which is used for connecting a deslagging pipe and a deslagging port of a CFB boiler and comprises a buffer pipe, an upper annular plate, a lower annular plate, a movable ring, a limiting ring, a plurality of bolt assemblies, a heat preservation filtering material, a baffle ring and a sealing cover. The movable ring is sleeved on the slag discharge pipe; the inner pipe at the upper part of the buffer pipe is radially expanded outwards to form a buffer area; the lower annular plate is welded at the upper part of the buffer pipe; a gap is reserved between the deslagging pipe and the lower annular plate; the slag discharge pipe is sleeved with the limiting ring, and a gap is reserved between the limiting ring and the movable ring; the slag discharge pipe is sleeved with the upper ring plate, and a gap is reserved between the slag discharge pipe and the upper ring plate; the upper ring plate, the limiting ring and the lower ring plate are locked through bolt assemblies; the slag discharging pipe is sleeved with the baffle ring, the baffle ring is welded to the upper annular plate, a gap is reserved between the slag discharging pipe and the baffle ring, and the gap between the slag discharging pipe and the baffle ring is filled with the heat preservation filtering material; and the sealing cover is welded on the baffle ring. According to the utility model, the reliability of connection between the slag discharge pipe and the slag discharge port of the CFB boiler can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler slag discharge pipe equipment technical field especially relates to a CFB boiler slag discharge pipe expansion device. BACKGROUND

[0002] The CFB slag cooler is used for the cooling and discharging of the ash slag of the CFB boiler (the full name is the biomass circulating fluidized bed boiler). At present, the slag discharge pipe is a pipeline for conveying the ash slag in the CFB slag cooler, and the temperature of the ash slag generated by the CFB boiler reaches 900 DEG C or above. When the ash slag is discharged into the slag discharge pipe through the slag discharge port of the CFB boiler, the ash slag discharged into the interior of the slag discharge pipe is rapidly cooled by the countercurrent water outside the slag discharge pipe. In the prior art, the slag discharge pipe is connected to the slag discharge port of the CFB boiler by welding or threaded connection. Due to the temperature difference, the connection between the slag discharge pipe and the slag discharge port of the CFB boiler is subjected to thermal expansion and cold contraction. In addition, the hot air contained in the ash slag also causes thermal expansion and cold contraction, which generates impact. In long-term use, the welding seam may be generated at the welding position of the slag discharge pipe and the slag discharge port of the CFB boiler, or the threaded connection position is loose, so that the connection between the slag discharge pipe and the slag discharge port of the CFB boiler is not firm, which is not conducive to the safety production. SUMMARY

[0003] Therefore, in view of the above problems, the utility model provides a CFB boiler slag discharge pipe expansion device which can improve the reliability of the connection between the slag discharge pipe and the slag discharge port of the CFB boiler.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] A CFB boiler slag discharge pipe expansion device is used for connecting the slag discharge pipe and the slag discharge port of the CFB boiler, which comprises a buffer pipe, an upper ring plate, a lower ring plate, a movable ring, a limiting ring, a heat preservation filter material, a blocking ring and a cover.

[0006] The movable ring is sleeved on the slag discharge pipe and can move up and down on the slag discharge pipe, and the inner diameter of the movable ring is attached to the outer diameter surface of the slag discharge pipe.

[0007] The bottom of the buffer pipe is connected with the slag discharge port of the CFB boiler, and the inner pipe diameter of the upper part of the buffer pipe is enlarged outward to form a buffer zone.

[0008] The lower ring plate is welded on the upper part of the buffer pipe, the lower ring plate is located below the movable ring, the lower end of the slag discharge pipe passes through the lower ring plate, and a gap is left between the outer diameter of the slag discharge pipe and the inner diameter of the lower ring plate.

[0009] The limiting ring is sleeved outside the slag discharge pipe, and the limiting ring is arranged on the lower ring plate, and a gap is left between the limiting ring and the movable ring.

[0010] The upper ring plate is sleeved outside the slag discharge pipe, and is arranged on the limiting ring, and a gap is left between the outer diameter of the slag discharge pipe and the inner diameter of the upper ring plate;

[0011] The upper ring plate, the limiting ring and the lower ring plate are locked by bolts;

[0012] The thickness of the limiting ring is greater than the thickness of the movable ring, and gaps are left between the movable ring and the upper ring plate and the lower ring plate;

[0013] The stop ring is sleeved outside the slag discharge pipe, and is welded on the upper ring plate, a gap is left between the outer diameter of the slag discharge pipe and the inner diameter of the stop ring, the heat preservation filter material is filled in the gap between the slag discharge pipe and the stop ring, and a plurality of exhaust holes are formed in the side surface of the stop ring;

[0014] A through hole matched with the outer diameter of the slag discharge pipe is formed in the cover, and the cover is welded on the outer diameter surface of the stop ring and the slag discharge pipe.

[0015] Further, the thickness of the movable ring is 10mm-30mm, the thickness of the limiting ring is 10mm-30mm, and the thickness of the limiting ring is greater than the thickness of the movable ring.

[0016] Further, the gap width between the limiting ring and the movable ring is 30mm-40mm.

[0017] Further, the heat preservation filter material is an aluminum silicate cotton board.

[0018] By adopting the foregoing technical scheme, the utility model has the advantages of:

[0019] The CFB boiler slag discharge pipe expansion device leaves a gap between the movable ring and the upper ring plate and the lower ring plate, on the one hand, the gap is reserved for thermal expansion and cold contraction of the slag discharge pipe, the upper ring plate, the lower ring plate and the movable plate, on the other hand, the air in the slag can be discharged through the gap left between the movable ring and the upper ring plate and the lower ring plate, the heat preservation filter material and the exhaust holes formed in the side surface of the stop ring in turn, reducing the air pressure impact of the slag on the slag discharge pipe. Moreover, the buffer zone in the buffer pipe can also reduce the air pressure impact of the slag. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic view of the utility model;

[0021] Figure 2 is Figure 1 is an enlarged view of A in figure 1;

[0022] Figure 3 is a structural schematic view of the stop ring with exhaust holes formed in the side surface. DETAILED DESCRIPTION

[0023] The utility model is further illustrated in combination with the drawings and specific embodiments.

[0024] Reference Figures 1-3 The embodiment provides a CFB boiler slag discharge pipe expansion device for connecting a slag discharge pipe 200 and a slag discharge port of a CFB boiler (not shown in the figure, and the position of the slag discharge port of the CFB boiler should be understood by those skilled in the art), which comprises a buffer pipe 100, an upper ring plate 1, a movable ring 2, a lower ring plate 3, a limiting ring 4, a plurality of bolt assemblies 5, a blocking ring 6, heat preservation filtering material 7 and a cover 8.

[0025] The movable ring 2 is sleeved on the slag discharge pipe 200 and can move up and down on the slag discharge pipe 200, and the inner diameter of the movable ring 2 is attached to the outer diameter surface of the slag discharge pipe 100. Preferably, the movable ring 2 is made of 310S stainless steel, and the thickness of the movable ring 2 is in the range of 10mm-30mm. In the specific embodiment, the thickness of the movable ring 2 is set to 18mm.

[0026] The bottom of the buffer pipe 100 is connected with the slag discharge port of the CFB boiler (not shown in the figure, and the connection mode should be understood by those skilled in the art), and the inner pipe of the upper part of the buffer pipe 100 is radially expanded to form a buffer zone 101; the diameter of the buffer zone 101 is greater than the diameter of the slag discharge port (not shown in the figure). When the slag in the slag discharge port is discharged into the buffer zone 101, the air pressure impact in the slag is reduced due to the fact that the diameter of the buffer pipe 100 is greater than the diameter of the slag discharge port, so that the air pressure impact on the CFB boiler slag discharge pipe expansion device can be reduced.

[0027] The lower ring plate 3 is welded on the upper part of the buffer pipe 100, the lower ring plate 3 is located below the movable ring 2, the lower end of the slag discharge pipe 200 penetrates through the lower ring plate 3, and a gap is left between the outer diameter of the slag discharge pipe 200 and the inner diameter of the lower ring plate 3. In the specific embodiment, the lower ring plate 3 is made of 310S stainless steel.

[0028] The limiting ring 4 is sleeved outside the slag discharge pipe 200, and the limiting ring 4 is arranged on the lower ring plate 3, a gap of 30mm-40mm is left between the limiting ring 4 and the movable ring 2; the limiting ring 4 is made of 310S stainless steel. The thickness of the limiting ring 4 is in the range of 10mm-30mm, and the thickness of the limiting ring 4 is greater than the thickness of the movable ring 2. In the specific embodiment, the thickness of the limiting ring 4 is set to 20mm.

[0029] The upper ring plate 1 is sleeved outside the slag discharge pipe 200, and the upper ring plate 1 is arranged on the limiting ring 4, a gap is left between the outer diameter of the slag discharge pipe 200 and the inner diameter of the upper ring plate 1. The upper ring plate 1 is made of 310S stainless steel.

[0030] The upper ring plate 1, the limiting ring 4 and the lower ring plate 3 are locked from top to bottom by the bolt assembly 5, the bolt assembly 5 is prior art, the installation mode of the bolt assembly 5 is prior art in the field, and details are not described here.

[0031] The baffle ring 6 is sleeved outside the slag discharge pipe 200, and the baffle ring 6 is welded on the upper ring plate 1, a gap is left between the outer diameter of the slag discharge pipe 200 and the inner diameter of the baffle ring 6, the heat preservation filter material 7 is filled in the gap between the slag discharge pipe 200 and the baffle ring 6, and a plurality of exhaust holes 61 are formed in the side surface of the baffle ring 6. Preferably, in the specific embodiment, the baffle ring 6 is made of 310S stainless steel, and the heat preservation filter material 7 is made of aluminum silicate cotton board.

[0032] In actual use, the heat preservation filter material 7 can also be glass wool, ceramic fiber, rock wool and the like.

[0033] A through hole (not shown in the figure) matched with the outer diameter of the slag discharge pipe 200 is formed in the cover 8, the cover 8 is welded on the outer diameter surface of the baffle ring 6 and the slag discharge pipe 200, and the cover 8 plays a role of fixing the CFB boiler slag discharge pipe expansion device.

[0034] Through the gaps between the upper ring plate 1, the movable ring 2 and the lower ring plate 3, and the gaps between the movable ring 2 and the limiting ring 4, on the one hand, the space for thermal expansion and cold contraction of the slag discharge pipe 200, the upper ring plate 1, the lower ring plate 3 and the movable ring 2 is reserved, and on the other hand, the air in the slag can be sequentially discharged through the gaps between the movable ring 2, the upper ring plate 1 and the lower ring plate 3, the heat preservation filter material 7 and the exhaust holes 61 formed in the side surface of the baffle ring 6, and the air pressure impact of the CFB boiler slag discharge pipe expansion device and the slag discharge pipe 200 is reduced. The heat preservation filter material 7 can effectively filter the slag, prevent the slag from being discharged outside the CFB boiler slag discharge pipe expansion device, and has a heat preservation effect to reduce heat loss.

[0035] Although the utility model is specifically shown and introduced in combination with the preferred embodiment, those skilled in the art should understand that various changes can be made to the utility model in form and detail without departing from the spirit and scope of the utility model defined in the appended claims, and all are within the protection scope of the utility model.

Claims

1. An expansion device for a CFB boiler ash discharge pipe, used to connect the ash discharge pipe and the ash discharge port of the CFB boiler, characterized in that: Includes a buffer tube, upper ring plate, lower ring plate, movable ring, limit ring, multiple bolt assemblies, thermal insulation filter material, retaining ring, and cap; The movable ring is sleeved on the slag discharge pipe and can move up and down the slag discharge pipe. The inner diameter of the movable ring is in contact with the outer diameter surface of the slag discharge pipe. The bottom of the buffer tube is connected to the slag discharge port of the CFB boiler, and the inner tube at the top of the buffer tube is radially expanded outward to form a buffer zone. The lower ring plate is welded to the upper part of the buffer pipe. The lower ring plate is located below the movable ring. The lower end of the slag discharge pipe passes through the lower ring plate, and there is a gap between the outer diameter of the slag discharge pipe and the inner diameter of the lower ring plate. The limiting ring is sleeved outside the slag discharge pipe and is set on the lower ring plate, with a gap between the limiting ring and the movable ring; The upper ring plate is sleeved outside the slag discharge pipe and is set on the limiting ring. A gap is left between the outer diameter of the slag discharge pipe and the inner diameter of the upper ring plate. The upper ring plate, the limiting ring, and the lower ring plate are locked together by various bolt assemblies; The thickness of the limiting ring is greater than the thickness of the movable ring, and there is a gap between the movable ring and the upper and lower ring plates. The retaining ring is sleeved on the outside of the slag discharge pipe and welded to the upper ring plate. A gap is left between the outer diameter of the slag discharge pipe and the inner diameter of the retaining ring. The heat-insulating filter material is filled in the gap between the slag discharge pipe and the retaining ring. Multiple vent holes are opened on the side of the retaining ring. The cover has a through hole that matches the outer diameter of the slag discharge pipe, and the cover is welded to the retaining ring and the outer diameter surface of the slag discharge pipe.

2. The expansion device for the ash discharge pipe of a CFB boiler according to claim 1, characterized in that: The thickness range of the movable ring is 10mm-30mm, the thickness range of the limiting ring is 10mm-30mm, and the thickness of the limiting ring is greater than the thickness of the movable ring.

3. The expansion device for the ash discharge pipe of a CFB boiler according to claim 1 or 2, characterized in that: The gap width between the limiting ring and the movable ring is 30mm-40mm.

4. The expansion device for the ash discharge pipe of a CFB boiler according to claim 3, characterized in that: The thermal insulation and filtration material is made of aluminum silicate cotton board.

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