Coal economizer tube bundle protection device for circulating fluidized bed boiler

Abstract

The utility model discloses a kind of circulating fluidized bed boiler economizer tube bundle protection devices, it includes the circulating fluidized bed boiler and economizer connected with each other, vertical serpentine heat exchange tube bundle is distributed in economizer, the left and right sides of the serpentine heat exchange tube bundle are equipped with elbow, high-temperature-resistant elastic colloid protective layer is wrapped outside elbow;The utility model can solve the problem of pipe bundle, tube row on the furnace wall side of economizer, pipe burst caused by flue gas scouring thinning.

Description

Technical Field

[0001] This utility model relates to a protective device for economizer tube bundles in a circulating fluidized bed boiler, belonging to the field of economizer protection tools for circulating fluidized bed boilers. Background Technology

[0002] The economizer of a circulating fluidized bed boiler uses the heat of high-temperature flue gas to heat the boiler feedwater and eventually produce saturated steam. It also reduces the flue gas temperature at the economizer inlet and increases the boiler feedwater temperature, thereby improving boiler efficiency.

[0003] In existing technology, the economizer of a circulating fluidized bed boiler is composed of serpentine tube bundles and tube banks arranged in sequence. The tube bundles and tube banks change direction by 180 degrees to form bends at the edge of the furnace wall. There are gaps between tube banks and between tube banks and the furnace wall. The working medium inside the tube bundle is high-pressure feedwater. The high-temperature flue gas outside the tube bundle exchanges heat with the feedwater inside the tube bundle from top to bottom. However, it is impossible for the bends of the tube banks at the edge of the furnace wall to be 100% on a horizontal line. In addition, the furnace wall surface is also uneven. The flue gas will change direction when flowing from top to bottom, thus scouring the tube bundles and tube banks at the edge of the furnace wall. This scouring can cause the tube bundles and tube banks to become thinner and lead to tube rupture accidents.

[0004] Therefore, a structure is needed to solve the problem of tube bundles and tube banks on the edge of the economizer furnace wall becoming thinner due to flue gas erosion, causing tube rupture. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a protective device for economizer tube bundles in circulating fluidized bed boilers, which can solve the problem of tube bundles and tube banks on the side of the economizer furnace wall becoming thin due to flue gas erosion and causing tube rupture, and can overcome the shortcomings of the prior art.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] This utility model discloses a protective device for economizer tube bundles in a circulating fluidized bed boiler. It includes a circulating fluidized bed boiler and an economizer connected to each other. Vertical serpentine heat exchange tube bundles are distributed inside the economizer. Elbows are provided on the left and right sides of the serpentine heat exchange tube bundles. A high-temperature resistant elastic colloidal protective layer is wrapped around the elbows.

[0008] The aforementioned elastic colloid protective layer is a silicone protective layer.

[0009] As mentioned above, vertical limiting plates are distributed between the serpentine heat exchange tube bundles.

[0010] The aforementioned limiting plate includes a vertical sleeve plate, a vertical storage opening on one side of the vertical sleeve plate, an inner plate that can retract inward and extend outward inside the vertical storage opening, and an automatic reset device for pushing the inner plate outward on the vertical sleeve plate.

[0011] The aforementioned automatic reset device includes a horizontal storage hole provided inside the vertical storage opening, a movable column that can extend and retract outwards provided in the horizontal storage hole, the outer end of the movable column abutting against the inner plate, and a compression spring provided between the movable column and the vertical guide groove.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model features a high-temperature resistant elastic colloidal protective layer wrapped around the elbow. The elastic colloidal protective layer is made of silicone. This structure offers several advantages: First, it facilitates installation. Existing serpentine heat exchanger tube bundles are fixed inside the economizer, and the distance between the elbows on both sides and the economizer wall is small, making protection through welding plates extremely difficult. However, with an elastic colloidal protective layer, such as silicone, it can be adhered to the elbow while still molten, effectively preventing direct impact from gas on the elbow. Second, existing serpentine heat exchanger tube bundles are prone to expansion when heated during use. If protected by welding with a metal protective shell, uneven heating between materials can easily cause compression or tearing, damaging the serpentine heat exchanger tube bundle. Therefore, the elastic colloidal protective layer can adapt to the expansion and contraction of the heat exchanger tube bundle.

[0014] 2. Vertical limiting plates are distributed between the serpentine heat exchanger tube bundles. After long-term use, the applicant found that the tube body is prone to deformation and bending, and even the adjacent serpentine heat exchanger tube bundles may intersect. Therefore, the vertical limiting plates help to limit the serpentine heat exchanger tube bundles in the vertical direction and reduce the bending during use.

[0015] 3. Furthermore, the limiting plate includes a vertical sleeve plate, with a vertical receiving opening on one side of the vertical sleeve plate. Inside the vertical receiving opening is an inner plate that can retract inward and extend outward. The vertical sleeve plate is equipped with an automatic reset device for pushing the inner plate outward. This structure is advantageous because the serpentine heat exchange tube bundle will expand due to heat during use. By dividing the limiting plate into a vertical sleeve plate and an inner plate that cooperate with each other, combined with the automatic reset device, the limiting plate can adapt to the thermal expansion of the serpentine heat exchange tube bundle, thus preventing the serpentine heat exchange tube bundle from being squeezed against the limiting plate when it expands due to heat.

[0016] The automatic reset device includes a horizontal storage hole inside the vertical storage opening, and a movable column that can extend outward is provided in the horizontal storage hole. The outer end of the movable column abuts against the inner plate. A compression spring is provided between the movable column and the vertical guide groove. This structure can keep the vertical sleeve plate and the inner plate pushed outward, which is conducive to keeping the vertical sleeve plate and the inner plate in contact with the adjacent serpentine heat exchange tube bundle.

[0017] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will describe this utility model in further detail with reference to the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic diagram of the connection structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the connection structure of the first embodiment of this utility model.

[0021] Figure 3 for Figure 1 A magnified view of part A in the diagram.

[0022] Figure 4 This is a schematic diagram of the connection structure between the soft-disk replacement tube and the elastic colloid protective layer of this utility model.

[0023] Figure 5 This is a schematic diagram of the connection structure after the elastic colloid protective layer is installed in this utility model.

[0024] Figure 6 This is a schematic diagram of the connection structure of a serpentine heat exchanger tube bundle in the prior art.

[0025] Figure 7 This is a schematic diagram of the connection structure between the existing serpentine heat exchanger tube bundle and the economizer.

[0026] Figure 8 This is a schematic diagram of the connection structure of the second embodiment of this utility model.

[0027] Figure 9 This is a schematic diagram of the connection structure of the limiting plate of this utility model.

[0028] Figure 10 This is a half-sectional view of the limiting plate of this utility model.

[0029] Figure 11 for Figure 9 A magnified view of part B in the diagram.

[0030] Among them, the circulating fluidized bed boiler is 1; economizer is 2; serpentine heat exchange tube bundle is 3; elbow is 4; elastic colloidal protective layer is 5; limiting plate is 6; vertical sleeve plate is 6-1; vertical receiving port is 6-2; inner plate is 6-3; automatic reset device is 7; horizontal receiving hole is 7-1; moving column is 7-2; and compression spring is 7-3. Detailed Implementation

[0031] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0032] Example 1

[0033] like Figures 1-7 As shown, this utility model discloses a protective device for economizer tube bundles in a circulating fluidized bed boiler. It includes a circulating fluidized bed boiler 1, an economizer 2, a serpentine heat exchange tube bundle 3, and an elastic colloidal protective layer 5. Specifically, the circulating fluidized bed boiler 1 and the economizer 2 are interconnected. Vertical serpentine heat exchange tube bundles 3 are distributed within the economizer 2. Elbows 4 are provided on both sides of the serpentine heat exchange tube bundle 3, and the elastic colloidal protective layer 5 wraps around the elbows 4. The elastic colloidal protective layer 5 is a high-temperature resistant structure and is made of silicone. The structure allows for easy installation of the elastic colloidal protective layer 5 during installation. While the layer is molten, it can be inserted into the economizer 2 using tools such as a brush. The layer is then applied to and wraps around the elbow 4 within the economizer 2, thus encasing the elbow 4. Once solidified, the layer is securely fitted. This method facilitates the installation of the elastic colloidal protective layer 5 onto the elbow 4. Furthermore, during use, the elastic colloidal protective layer 5 adapts to the expansion and contraction of the serpentine heat exchange tube bundle 3 without causing any damage.

[0034] Example 2

[0035] like Figures 8-11 As shown, the difference between this embodiment and embodiment 1 is that vertical limiting plates 6 are also distributed between the serpentine heat exchange tube bundles 3. This is because after long-term use, the serpentine heat exchange tube bundles 5 may experience misalignment or bending. Therefore, the limiting plates 6 help to limit the vertical serpentine heat exchange tube bundles 5, which helps to reduce the occurrence of bending or misalignment.

[0036] Furthermore, the limiting plate 6 includes a vertical sleeve plate 6-1, with a vertical receiving opening 6-2 on one side of the vertical sleeve plate 6-1. An inner plate 6-3 that can retract inward and extend outward is provided inside the vertical receiving opening 6-2. An automatic reset device 7 for pushing the inner plate 6-3 outward is provided on the vertical sleeve plate 6-1. Because the serpentine heat exchange tube bundle 4 will expand due to heat during use, the distance between the vertical sleeve plate 6-1 and the inner plate 6-3 and the automatic reset device 7 can be adjusted to adapt to the expansion or contraction of the serpentine heat exchange tube bundle 5, thus preventing the limiting plate 6 from squeezing and damaging the serpentine heat exchange tube bundle 5 when it expands.

[0037] Furthermore, the automatic reset device 7 includes a horizontal storage hole 7-1 provided inside the vertical storage opening 6-2, and a movable column 7-2 that can extend outward is provided in the horizontal storage hole 7-1. The outer end of the movable column 7-2 abuts against the inner plate 6-3. A compression spring 7-3 is provided between the movable column 7-2 and the vertical guide groove. With this structure, the compression spring 7-3 can push the inner plate 6-3 outward at all times, thereby keeping the vertical sleeve plate 6-1 and the inner plate 6-3 in contact with the adjacent serpentine heat exchange tube bundle 5.

[0038] The above description is merely a preferred embodiment of the present utility model and is not intended to restrict the present utility model in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments without departing from the technical solution of the present utility model and based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A protective device for economizer tube bundles in a circulating fluidized bed boiler, comprising a circulating fluidized bed boiler (1) and an economizer (2) connected to each other, wherein vertical serpentine heat exchange tube bundles (3) are distributed within the economizer (2), and elbows (4) are provided on the left and right sides of the serpentine heat exchange tube bundles (3), characterized in that: The elbow (4) is wrapped with a high-temperature resistant elastic colloid protective layer (5).

2. The economizer tube bundle protection device for circulating fluidized bed boilers according to claim 1, characterized in that: The elastic colloidal protective layer (5) is a silicone protective layer.

3. The economizer tube bundle protection device for circulating fluidized bed boilers according to claim 1, characterized in that: Vertical limiting plates (6) are distributed between the serpentine heat exchange tube bundles (3).

4. The economizer tube bundle protection device for circulating fluidized bed boilers according to claim 3, characterized in that: The limiting plate (6) includes a vertical sleeve plate (6-1), a vertical storage opening (6-2) is provided on one side of the vertical sleeve plate (6-1), an inner plate (6-3) that can be retracted inward and extended outward is provided in the vertical storage opening (6-2), and an automatic reset device (7) is provided on the vertical sleeve plate (6-1) for pushing the inner plate (6-3) outward.

5. The economizer tube bundle protection device for circulating fluidized bed boilers according to claim 4, characterized in that: The automatic reset device (7) includes a horizontal storage hole (7-1) provided inside the vertical storage opening (6-2), and a movable column (7-2) that can extend outward is provided in the horizontal storage hole (7-1). The outer end of the movable column (7-2) abuts against the inner plate (6-3), and a compression spring (7-3) is provided between the movable column (7-2) and the vertical guide groove.

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