Damage-proof device for pouring materials of U-shaped heat insulation type material returning device of circulating fluidized bed boiler

Abstract

The utility model relates to an anti-damage device for pouring materials of a U-shaped heat insulation type material returning device of a circulating fluidized bed boiler, which is characterized in that a straight pipe, a vulcanizing chamber and a material returning leg are all formed by sequentially connecting a plurality of barrels, and every two adjacent barrels are communicated with each other; a plurality of supporting plates are connected to the inner side wall of the cylinder body at equal intervals, and the supporting plates divide the cylinder body into a plurality of small branch bins used for laying heat preservation layers and plastic shrinkage layers. The utility model relates to the technical field of material returning devices. According to the anti-damage device for the pouring material of the U-shaped heat insulation type material returning device of the circulating fluidized bed boiler, the supporting plates are arranged in the barrel body, so that a heat preservation layer and a plastic shrinkage layer can be divided into a plurality of small branch bins, and the heat preservation layer and the plastic shrinkage layer between the small branch bins are independent of each other; the influence range is prevented from being enlarged after the plastic shrinkage layer cracks and fires, and the heat preservation layer is prevented from being emptied, so that the red burning area of the external steel plate can be effectively prevented from being increased.

Description

Technical Field

[0001] The utility model relates to the technical field of material return devices, in particular to an anti-damage device for casting materials of a U-shaped insulation material return device of a circulating fluidized bed boiler. Background Art

[0002] The return device is an important component to ensure the separation effect of the cyclone separator. Its basic task is to stably transport the high-temperature solid particles separated by the separator back to the furnace, and form ash blockage with a certain material level pressure difference, to ensure that the amount of gas backflow entering the separator is minimal, and to ensure a benign and stable material flow of a large number of solid particles through the separator and the return device and then into the furnace, which is a fundamental guarantee for the normal operation of the circulating fluidized bed boiler.

[0003] In the prior art, the material concentration in the U-shaped return material area is high, and the sealing requirements are high. The castable is in contact with the high-concentration material for a long time, which causes the internal castable to fall off. When the castable is damaged, the external steel plate will burn red and the red area will continue to expand. Eventually, the unit load is forced to be limited and the unit efficiency is weakened. If it is not handled, once the steel plate burns through, it will increase the operation and maintenance costs and cause abnormal shutdown of the unit. In serious cases, it will pose a great threat to the safety of personnel and equipment. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a device for preventing damage to casting materials of a U-shaped insulated return feeder of a circulating fluidized bed boiler, so as to solve the technical problems mentioned in the above background technology.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A device for preventing the casting material of a U-shaped insulated return feeder of a circulating fluidized bed boiler from being damaged comprises a straight pipe, wherein two straight pipes are provided, namely a straight pipe A and a straight pipe B, wherein the length of the straight pipe A is greater than the length of the straight pipe B;

[0007] A vulcanization chamber, wherein the top sides of the vulcanization chamber are respectively connected with a straight pipe A and a straight pipe B, and a wind-proof steel plate beam is provided at the connection between the straight pipe A and the straight pipe B and the vulcanization chamber, and a fire-proof beam is provided between the straight pipe A and the straight pipe B in the vulcanization chamber;

[0008] A material return leg, the material return leg is connected to the top of the straight tube B, and the end of the material return leg away from the straight tube B is tilted downward;

[0009] The straight pipe, the vulcanization chamber and the return leg are all formed by connecting a plurality of cylinders in sequence, and two adjacent cylinders are connected to each other;

[0010] The inner side wall of the cylinder is connected with a plurality of support plates at equal intervals, and the plurality of support plates divide the cylinder into a plurality of small compartments for laying the insulation layer and the plastic shrinkable layer;

[0011] The support plates between two adjacent cylinders are arranged in a staggered manner.

[0012] By adopting the above technical solution, the insulation layer and the plastic shrinkage layer between each small compartment can be made independent of each other, thereby preventing the expansion of the impact range after the plastic shrinkage layer cracks and ignites, and preventing the insulation layer from being hollowed out.

[0013] In a preferred example, the utility model can be further configured as follows: pins are evenly distributed on the side of the plastic shrinkable layer away from the heat-insulating layer, and a hanging net is connected to the side of the pins away from the plastic shrinkable layer.

[0014] By adopting the above technical solution, the plastic shrinkable layers can be connected into a whole, which can effectively increase the use load of the material return device and reduce the use cost of the material return device.

[0015] In a preferred example, the utility model can be further configured as follows: the pin includes a head end and a tail end, wherein the head end is bent to one side to form a bent portion and is buried in the plastic shrinkable layer, and the outer wall of the tail end is symmetrically provided with two protrusions on the center line to make the pin Y-shaped, and the side of the protrusion away from the tail end is bent to form a supporting portion for supporting the hanging net.

[0016] By adopting the above technical solution, the anchoring performance between the pins and the plastic shrinkable layer can be improved, and the provision of the support portion can enable the pins to better support the hanging net, thereby facilitating the laying of the hanging net.

[0017] In a preferred example, the utility model can be further configured as follows: the hanging net is formed by a plurality of horizontal lines and a plurality of vertical lines that are staggered and laid flat, and the cross-sections of the horizontal lines and the vertical lines are both circular.

[0018] By adopting the above technical solution, it is possible to avoid the hanging net from cutting the plastic shrinkable layer into small pieces, thereby preventing the plastic shrinkable layer from being fragmented and affecting the overall strength.

[0019] In a preferred example, the utility model can be further configured as follows: at least two shrinkage seams are equidistantly arranged on a side of the plastic shrinkable layer away from the thermal insulation layer.

[0020] By adopting the above technical solution, the plastic shrinkable layer can be prevented from being damaged due to thermal expansion.

[0021] In a preferred example, the utility model can be further configured as follows: an expansion joint is provided at the intersection of the return leg, the straight tube and the plastic shrinkable layer of the vulcanization chamber;

[0022] The expansion joint consists of a transverse gap and a longitudinal gap. A gap is left at the junction of two adjacent plastic shrinkable layers to form a transverse gap. The deepest part of the transverse gap extends toward the insulation layer on one side to form a longitudinal gap.

[0023] By adopting the above technical solution, it is possible to avoid mutual squeezing and damage of two adjacent plastic shrinkable layers due to expansion.

[0024] In a preferred example, the utility model can be further configured as follows: a plurality of triangular plate ribs are fixedly connected at the intersection of the inner side walls of the cylinder, and the triangular plate ribs are avoided from the support plate.

[0025] By adopting the above technical solution, the load-bearing capacity of the cylinder can be further improved, and the cylinder can be prevented from sinking due to the gravity of the plastic shrinkable layer.

[0026] In summary, the present invention includes at least one of the following beneficial technical effects:

[0027] 1. The anti-damage device for the casting material of the U-shaped insulated return feeder of a circulating fluidized bed boiler can divide the insulation layer and the plastic shrinkable layer into a plurality of small compartments by arranging a support plate in the cylinder body, so that the insulation layer and the plastic shrinkable layer in each small compartment are independent of each other, so as to avoid the expansion of the influence range after the cracking and fire of the plastic shrinkable layer, and prevent the insulation layer from being hollowed out, so as to effectively avoid the increase of the red-burning area of ​​the external steel plate, improve the use load of the return feeder, increase the service life of the return feeder, and reduce the use cost of the return feeder;

[0028] 2. The anti-damage device for the casting material of the U-shaped insulated return material device of the circulating fluidized bed boiler can connect the plastic shrinkable layer into a whole through the arranged pins and hanging nets, thereby improving the overall strength of the plastic shrinkable layer to prevent the plastic shrinkable layer from falling off, and further increasing the use load of the return material device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 The utility model is a structural schematic diagram of a device for preventing damage to casting materials of a U-shaped adiabatic return feeder of a circulating fluidized bed boiler.

[0031] Figure 2 The utility model is a structural schematic diagram of a wind-proof steel plate beam in a damage-proof device for casting materials of a U-shaped adiabatic return feeder of a circulating fluidized bed boiler.

[0032] Figure 3 The utility model is a structural schematic diagram of an expansion joint in a damage prevention device for casting materials of a U-shaped insulated return feeder of a circulating fluidized bed boiler.

[0033] Figure 4 The utility model is a schematic structural diagram of a shrinkage joint in a damage prevention device for casting materials of a U-shaped insulated return feeder of a circulating fluidized bed boiler.

[0034] Figure 5 The utility model is a schematic structural diagram of a cylinder in a device for preventing damage to casting materials of a U-shaped adiabatic return feeder of a circulating fluidized bed boiler.

[0035] Figure 6 The utility model is a schematic structural diagram of a pin in a device for preventing damage to casting material of a U-shaped adiabatic return feeder of a circulating fluidized bed boiler.

[0036] In the figure, 1. straight pipe A; 2. straight pipe B; 3. vulcanizing chamber; 4. return leg; 5. anti-wind steel plate beam; 6. anti-fire beam; 7. cylinder; 8. support plate; 9. insulation layer; 10. plastic shrinkable layer; 11. pin; 111. head end; 112. tail end; 12. hanging net; 121. horizontal line; 122. vertical line; 13. bending part; 14. raised part; 15. support part; 16. contraction joint; 17. expansion joint; 18. triangular plate reinforcement. DETAILED DESCRIPTION

[0037] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0038] Example:

[0039] Reference Figure 1 - Figure 6 The utility model discloses a U-shaped insulated return material device for a circulating fluidized bed boiler, which includes a straight pipe. Two straight pipes are provided, namely, a straight pipe A1 and a straight pipe B2, wherein the length of the straight pipe A1 is greater than the length of the straight pipe B2;

[0040] A vulcanization chamber 3, wherein the top two sides of the vulcanization chamber 3 are respectively connected with a straight pipe A1 and a straight pipe B2, and a wind-proof steel plate beam 5 is provided at the connection between the straight pipe A1 and the straight pipe B2 and the vulcanization chamber 3, and a fire-proof beam 6 is provided between the straight pipe A1 and the straight pipe B2 in the vulcanization chamber 3;

[0041] A return leg 4, wherein the return leg 4 is connected to the top of the straight tube B2, and one end of the return leg 4 away from the straight tube B2 is inclined downward;

[0042] The straight pipe, the vulcanization chamber 3 and the return leg 4 are all formed by connecting a plurality of cylinders 7 in sequence, and two adjacent cylinders 7 are connected to each other;

[0043] The inner wall of the cylinder 7 is connected with a plurality of support plates 8 at equal intervals, and the plurality of support plates 8 divide the cylinder 7 into a plurality of small compartments for laying the insulation layer 9 and the plastic shrinkable layer 10;

[0044] The support plates 8 between two adjacent cylinders 7 are arranged in a staggered manner.

[0045] In this embodiment, the high-concentration material enters the vulcanization chamber 3 through the straight pipe A1, and then enters the furnace through the straight pipe B2 and the return leg 4. The height of the straight pipe is a very important parameter in the design and manufacture. In order to prevent gas backflow, the straight pipe must have a certain height to form a sufficient pressure difference to overcome the pressure difference between the separator and the furnace. Therefore, the straight pipe A1 is longer than the straight pipe B2, so that a height difference is formed between the straight pipe A1 and the straight pipe B2, so as to form a sufficient pressure difference.

[0046] In order to prevent the steel plate on the outer wall of the return feeder from burning red during use and affecting the unit load, castables are filled in the return feeder to prevent the steel plate from coming into contact with high-concentration materials and burning red. Long-term contact between the castable and high-concentration materials will cause the castable to expand and crack due to heat and gradually fall off, resulting in air and material leakage in the return feeder, causing the steel plate on the outside of the return feeder to burn red. As the area where the castable falls off increases, the red-burned area of ​​the steel plate will gradually increase, causing the unit load to be forced to be restricted, affecting the operation of the return feeder.

[0047] Therefore, the straight pipe of the return material machine, the vulcanization chamber 3 and the return material leg 4 are formed by connecting a plurality of cylinders 7 in sequence, and a plurality of support plates 8 are connected inside the cylinder 7. Under the action of the support plates 8, the cylinder 7 is divided into a plurality of small compartments, so that the thermal insulation layer 9 and the plastic shrinkable layer 10 in each small compartment are independent of each other. At this time, when the independent plastic shrinkable layer 10 cracks and falls off due to thermal expansion, it will not be able to continue to spread under the restriction of the support plates 8, so as to prevent the plastic shrinkable layer and the thermal insulation layer from being hollowed out, reduce the difficulty of maintenance, and reduce the cost of use.

[0048] Since the straight pipe A1 and the straight pipe B2 are connected to the vulcanization chamber 3, there will be a gap in the connection, so an anti-wind-channeling steel plate beam 5 is provided at the connection between the straight pipe A1 and the straight pipe B2 and the vulcanization chamber 3 to enhance the sealing and reduce wind channeling. At the same time, an anti-fire channeling beam is provided between the straight pipe A1 and the straight pipe B2 in the vulcanization chamber 3 to further enhance the sealing effect.

[0049] observe Figure 5 It can be found that the support plates 8 in the cylinder 7 are arranged in a staggered manner, so that the insulation layer 9 and the plastic shrinkable layer 10 filled in each independent small partition can be supported by the support plates 8 on the adjacent two sides, thereby improving the structural strength of the cylinder 7 and the overall strength of the return device.

[0050] Among them, the above-mentioned insulation layer 9 adopts 280mm insulation cotton; the plastic shrinkage layer is a 120mm plastic structure; the anti-fire beam is made of a mixture of 40mm insulation cotton, 240mm lightweight insulation castable and 120mm plastic structure.

[0051] In a further preferred embodiment of the present invention, Figure 4 As shown, pins 11 are evenly distributed on the side of the plastic shrinkable layer 10 away from the heat-insulating layer 9 , and a hanging net 12 is connected to the side of the pins 11 away from the plastic shrinkable layer 10 .

[0052] In this embodiment, the plastic shrinkable layer 10 is in contact with high-concentration materials for a long time and will crack due to heat expansion, which will cause the plastic shrinkable layer 10 to fall off. Therefore, a pin 11 is connected inside the plastic shrinkable layer 10, and a hanging net 12 is connected to the side of the pin 11 away from the plastic shrinkable layer 10. The hanging net 12 can provide support for the plastic shrinkable layer 10, reduce the falling of the plastic shrinkable layer 10, effectively extend the service life of the plastic shrinkable layer 10, and reduce the use cost of the return material device.

[0053] The provision of the hanging net 12 can also connect the plastic shrinkable layers 10 in a plurality of small partitions into a whole, thereby improving the overall strength of the plastic shrinkable layer 10 .

[0054] In a further preferred embodiment of the present invention, Figure 6 As shown, the pin 11 includes a head end 111 and a tail end 112, wherein the head end 111 is bent to one side to form a bent portion 13 and is buried in the plastic shrinkable layer 10, and the outer wall of the tail end 112 is symmetrically provided with two protrusions 14 on the midline to make the pin 11 Y-shaped, and the side of the protrusion 14 away from the tail end 112 is bent to form a supporting portion 15 for supporting the hanging net 12.

[0055] In this embodiment, because the pin 11 is embedded in the plastic shrinkable layer 10 and the supporting portion 15 of the pin 11 is connected to the hanging net 12, the pin 11 will be pulled out of the plastic shrinkable layer 10 under the gravity of the hanging net 12 for a long time, causing the hanging net 12 to fall off and lose its supporting effect on the plastic shrinkable layer 10.

[0056] Therefore, a bending portion 13 is provided at the head end 111 of the pin 11, which can enhance the anchoring performance with the plastic shrinkable layer 10, thereby improving the connection strength between the pin 11 and the plastic shrinkable layer 10 and effectively preventing the hanging net 12 from falling off.

[0057] In a further preferred embodiment of the present invention, Figure 4 As shown, the hanging net 12 is formed by a plurality of horizontal lines 121 and a plurality of vertical lines 122 which are laid out in an alternating manner, and the cross-sections of the horizontal lines 121 and the vertical lines 122 are both circular.

[0058] In this embodiment, the hanging net 12 provides support for the plastic shrinkable layer 10, so the plastic shrinkable layer 10 is in direct contact with the hanging net 12. When the plastic shrinkable layer 10 is in direct contact with the hanging net 12, it will be squeezed and cracked by the horizontal lines 121 and the vertical lines 122, which will cause the plastic shrinkable layer 10 to be divided into small pieces, thereby causing the plastic shrinkable layer 10 to be fragmented and affecting its strength. Therefore, the cross-sections of the horizontal lines 121 and the vertical lines 122 of the hanging net 12 are circular surfaces to reduce the pressure when the hanging net 12 is in contact with the plastic shrinkable layer 10, thereby avoiding the plastic shrinkable layer 10 from being cut, and effectively extending the service life of the plastic shrinkable layer 10.

[0059] In a further preferred embodiment of the present invention, Figure 4 As shown, at least two shrinkage seams 16 are equidistantly arranged on a side of the plastic shrinkable layer 10 away from the thermal insulation layer 9 .

[0060] In this embodiment, the object expands and contracts due to temperature changes. The linear expansion coefficient is one of the important properties that should be considered when using refractory materials. In order to offset the stress caused by thermal expansion, expansion joints need to be reserved. The linear expansion coefficient is a key parameter for the design and calculation of the reserved expansion joints and the overall size of the masonry structure. It is closely related to the thermal shock resistance of the material and the distribution and size of the thermal stress inside the material when subjected to thermal shock.

[0061] Therefore, the shrinkage seam 16 is provided on the plastic shrinkable layer 10 , which can effectively improve the service life of the plastic shrinkable layer 10 and prevent the plastic shrinkable layer 10 from being cracked due to the influence of temperature changes.

[0062] Specifications of the contraction joint 16: A contraction joint 16 is reserved every 600mm to 800mm in each layout construction area. The contraction joint 16 does not penetrate the insulation layer 9. The depth is about 1 / 3 of the thickness of the fire-resistant layer (taking 120mm thickness as an example, the depth is about 40 to 50mm), and the seam width is about 2-3mm.

[0063] In a further preferred embodiment of the present invention, Figure 3 As shown, an expansion joint 17 is provided at the intersection of the return leg 4, the straight tube and the plastic shrinkable layer 10 of the vulcanization chamber 3;

[0064] The expansion joint 17 consists of a transverse gap and a longitudinal gap. A gap is left at the junction of two adjacent plastic shrinkable layers 10 to form a transverse gap. The deepest part of the transverse gap extends toward the insulation layer 9 on one side to form a longitudinal gap.

[0065] In this embodiment, when the plastic shrinkable layer 10 expands or contracts due to temperature changes, the intersections of two adjacent plastic shrinkable layers 10 will squeeze each other, thereby increasing the pressure at the intersection of the plastic shrinkable layers 10, causing the plastic shrinkable layers 10 to be damaged and fall off due to squeezing.

[0066] Therefore, a gap is left at the junction of two adjacent plastic shrinkable layers 10 to form a transverse gap, and the deepest part of the transverse gap extends toward the insulation layer 9 on one side to form a longitudinal gap, which can effectively prevent the plastic shrinkable layers 10 from being squeezed against each other and falling off when expanding transversely and longitudinally.

[0067] In a further preferred embodiment of the present invention, Figure 5 As shown, a plurality of triangular plate ribs 18 are fixedly connected to the intersection of the inner side walls of the cylinder 7 , and the triangular plate ribs 18 are avoided from the support plate 8 .

[0068] In this embodiment, when the cylinder 7 is filled with the plastic shrinkable layer 10, the cylinder 7 will be pulled down by the gravity of the plastic shrinkable layer 10, thereby causing the structure of the return material device to deform and affecting the strength of the return material device.

[0069] Therefore, a triangular plate rib 18 is provided at the intersection of the inner wall of the cylinder 7, and the triangular plate rib 18 can be used to strengthen the weight capacity of the cylinder 7, strengthen the rigidity of the cylinder 7, and avoid deformation of the return device.

[0070] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A device for preventing damage to casting material of a U-shaped insulated return feeder of a circulating fluidized bed boiler, characterized in that: It comprises a straight pipe, wherein two straight pipes are provided, namely a straight pipe A (1) and a straight pipe B (2), wherein the length of the straight pipe A (1) is greater than the length of the straight pipe B (2); A vulcanization chamber (3), wherein the top sides of the vulcanization chamber (3) are respectively connected to a straight pipe A (1) and a straight pipe B (2), a wind-proof steel plate beam (5) is provided at the connection between the straight pipe A (1) and the straight pipe B (2) and the vulcanization chamber (3), and a fire-proof beam (6) is provided between the straight pipe A (1) and the straight pipe B (2) in the vulcanization chamber (3); A return leg (4), the return leg (4) being connected to the top of the straight tube B (2), and the end of the return leg (4) away from the straight tube B (2) being inclined downward; The straight pipe, the vulcanization chamber (3) and the return leg (4) are all formed by connecting a plurality of cylinders (7) in sequence, and two adjacent cylinders (7) are connected to each other; The inner side wall of the cylinder (7) is connected to a plurality of support plates (8) at equal intervals, and the plurality of support plates (8) divide the cylinder (7) into a plurality of small compartments for laying the thermal insulation layer (9) and the plastic shrinkable layer (10); The support plates (8) between two adjacent cylinders (7) are arranged in a staggered manner.

2. The anti-damage device for casting material of a U-shaped insulated return feeder of a circulating fluidized bed boiler according to claim 1 is characterized in that: Pins (11) are evenly distributed on the side of the plastic shrinkable layer (10) away from the heat-insulating layer (9), and a hanging net (12) is connected to the side of the pins (11) away from the plastic shrinkable layer (10).

3. The anti-damage device for casting material of a U-shaped insulated return feeder of a circulating fluidized bed boiler according to claim 2 is characterized in that: The pin (11) comprises a head end (111) and a tail end (112), wherein the head end (111) is bent to one side to form a bent portion (13) and is embedded in the plastic shrinkable layer (10), and the outer wall of the tail end (112) is symmetrically provided with two protrusions (14) about the midline so that the pin (11) is Y-shaped, and the protrusion (14) is bent at one side away from the tail end (112) to form a supporting portion (15) for supporting the hanging net (12).

4. The anti-damage device for casting material of a U-shaped insulated return feeder of a circulating fluidized bed boiler according to claim 2 is characterized in that: The hanging net (12) is formed by a plurality of horizontal lines (121) and a plurality of vertical lines (122) which are laid out in a staggered and spaced manner, and the cross sections of the horizontal lines (121) and the vertical lines (122) are both circular.

5. The anti-damage device for casting material of a U-shaped insulated return feeder of a circulating fluidized bed boiler according to claim 1 is characterized in that: At least two shrinkage seams (16) are arranged at equal intervals on a side of the plastic shrinkable layer (10) away from the thermal insulation layer (9).

6. The device for preventing damage to casting material of a U-shaped insulated return feeder of a circulating fluidized bed boiler according to claim 1, characterized in that: An expansion joint (17) is provided at the junction of the return leg (4), the straight tube and the plastic shrinkable layer (10) of the vulcanization chamber (3); The expansion joint (17) consists of a transverse gap and a longitudinal gap. A gap is left at the junction of two adjacent plastic shrinkable layers (10) to form a transverse gap. The deepest part of the transverse gap extends toward the insulation layer (9) on one side to form a longitudinal gap.

7. The device for preventing damage to casting material of a U-shaped insulated return feeder of a circulating fluidized bed boiler according to claim 1, characterized in that: A plurality of triangular plate ribs (18) are fixedly connected at the intersection of the inner side walls of the cylinder (7), and the triangular plate ribs (18) are arranged to avoid the support plate (8).

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