Flue gas desulfurization system and method of installing a flue gas desulfurization system

Abstract

The application provides a flue gas desulfurization system and a mounting method thereof. The flue gas desulfurization system comprises a chimney, a flue connected to the chimney at a flue connecting hole of the chimney, a plugging platform arranged in an inner cavity of the chimney and located at a lower end of the flue connecting hole, and a corrosion-resistant layer arranged on an inner wall of the chimney above the plugging platform and on an upper end surface of the plugging platform. The corrosion-resistant layer arranged on the inner wall of the chimney can effectively improve the corrosion resistance of the chimney, guarantee the service life and structural strength, and has a simple structure process and a significantly reduced production cost compared with the construction of an inner cylinder in the chimney.

Description

Technical Field

[0001] This invention belongs to the field of coal chemical technology, specifically relating to a flue gas desulfurization system and a method for installing the flue gas desulfurization system. Background Technology

[0002] In the flue gas desulfurization process of thermal power plants, flue gas enters the absorption tower through the original flue, where it comes into countercurrent contact with the spray layer slurry and undergoes a desulfurization reaction. The clean flue gas after desulfurization is then discharged into the chimney through the flue. However, the temperature of the flue gas after desulfurization is significantly reduced (usually 45~80℃), the humidity is greatly increased, and it contains unreacted acidic components such as SO2 and HCl, as well as corrosive media such as sulfurous acid and sulfates. This low-temperature, high-humidity, and acidic environment easily forms highly corrosive acid condensation on the inner wall of the chimney, with a pH value as low as 1-2. This causes severe chemical and electrochemical corrosion to conventional building materials (such as concrete and ordinary steel), leading to a decrease in the structural strength of the chimney and a shortened service life.

[0003] To address corrosion issues, current technologies commonly employ the addition of corrosion-resistant inner linings within chimneys. These mainly include steel inner linings, brick inner linings, and fiberglass inner linings. However, using steel inner linings requires the use of corrosion-resistant alloy steel, resulting in high material costs and susceptibility to localized corrosion at welded joints. Using acid-resistant bricks or vitrified bricks as linings requires silicone rubber seals and complex support structures, leading to long construction periods and difficult maintenance. While fiberglass inner linings offer corrosion resistance, their resistance to temperature changes is insufficient, making them prone to delamination and cracking under the alternating effects of high-temperature flue gas (130~150℃) and low-temperature condensate.

[0004] While the above solutions can alleviate the corrosion problem in the short term, they significantly increase the construction cost of the chimney, the complexity of the materials and construction techniques used during construction, and the subsequent maintenance, which in turn drives up the overall project cost.

[0005] Therefore, there is an urgent need to develop a chimney inner wall protection technology that takes into account corrosion resistance, structural stability and economy, in order to reduce the operating cost of desulfurization system and extend the service life of chimney. Summary of the Invention

[0006] To address some or all of the aforementioned technical problems in the existing technology, this invention proposes a flue gas desulfurization system and its installation method. In this flue gas desulfurization system, an anti-corrosion layer is utilized.

[0007] According to one aspect of the present invention, a flue gas desulfurization system is provided, comprising:

[0008] The chimney has flue connection holes on its walls.

[0009] A flue, which connects to the flue connection hole so that the flue communicates with the chimney.

[0010] A sealing platform is disposed within the inner cavity of the chimney and located at the lower end of the flue connection hole.

[0011] An anti-corrosion layer is provided on the upper surface of the sealing platform and on the inner wall of the chimney above the sealing platform.

[0012] In one embodiment, a cantilever platform is provided on the outer wall of the chimney, and a support device for supporting the flue is provided on the cantilever platform.

[0013] In one embodiment, the support device includes a side support assembly for supporting the side of the flue in the width direction, the side support assembly comprising:

[0014] Side support plates fixed to the cantilever platform

[0015] Side support leg, which is disposed on the side support plate and used to abut against the flue.

[0016] In one embodiment, the support device includes an intermediate support assembly for supporting the middle side of the flue in the width direction, the intermediate support assembly comprising:

[0017] Two limiting baffles are arranged opposite each other in the width direction of the flue, and the limiting baffles are fixed to the cantilever platform.

[0018] An intermediate support leg is disposed between the two limiting baffles and extends into the flue.

[0019] A reinforcing plate is provided on the outside of each of the limiting baffles, with one side of the reinforcing plate fixed to the limiting baffle and the other side provided to the cantilever platform.

[0020] In one embodiment, the cantilever platform and the sealing platform are an integral reinforced concrete structure, and a first pre-embedded part is provided on the cantilever platform for connecting the support device.

[0021] In one embodiment, an inclined support is provided on the lower end face of the cantilever platform, and one end of the inclined support is connected to the outer wall of the chimney.

[0022] In one embodiment, a second reserved embedded part is provided on the lower end face of the cantilever platform, and a third reserved embedded part is provided on the wall of the chimney. The two ends of the inclined support are respectively connected to the second reserved embedded part and the third reserved embedded part.

[0023] In one embodiment, a baffle door and an expansion joint are provided in the inner cavity of the flue, and the baffle door and the expansion joint are disposed between the flue connection hole and the support device along the length of the flue.

[0024] In one embodiment, an outwardly protruding guide cylinder is provided at the flue connection hole of the chimney, and a reserved angle steel ring is provided on the guide cylinder. The flue extends into the reserved angle steel ring and is fixed to the reserved angle steel ring.

[0025] According to another aspect of the present invention, a method for installing a flue gas desulfurization system is provided, comprising:

[0026] Step 1: Assemble the chimney by disassembling and preparing it. A sealing platform and a cantilever platform are installed on the chimney. A supporting device is installed on the cantilever platform, and an outwardly protruding guide cylinder is installed at the flue connection hole of the chimney. A pre-installed angle steel ring is installed on the guide cylinder. Prepare the flue, and install a baffle door and an expansion joint inside the flue.

[0027] Step two, final assembly: Connect one end of the flue to the chimney and attach it to the support device. Insert the flue into the pre-reserved angle steel ring and weld the flue and the pre-reserved angle steel ring together.

[0028] Step 3: Lay an anti-corrosion layer on the upper surface of the sealing platform and on the inner wall of the chimney above the sealing platform.

[0029] Compared with the prior art, the advantages of the present invention are: by setting an anti-corrosion layer on the inner wall of the chimney, the corrosion resistance of the chimney can be effectively improved, ensuring service life and structural strength. At the same time, setting an anti-corrosion layer on the inner wall of the chimney has a simple structure and process, and the production cost is significantly reduced compared with building an inner cylinder inside the chimney. Attached Figure Description

[0030] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which:

[0031] Figure 1 A front view of the flue gas desulfurization system according to the present invention is shown;

[0032] Figure 2 For from Figure 1 AA section view;

[0033] Figure 3 For from Figure 1 BB section view;

[0034] Figure 4 For from Figure 2 CC section view;

[0035] Figure 5 For from Figure 4 DD sectional view;

[0036] Figure 6 For from Figure 4 EE sectional view.

[0037] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0038] To make the technical solutions and advantages of the present invention clearer, exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not an exhaustive list of all embodiments. Furthermore, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0039] Embodiments of the present invention provide a flue gas desulfurization system. For example... Figures 1 to 6 As shown, the flue gas desulfurization system includes a chimney 1, a flue 2, a sealing platform 3, and an anti-corrosion layer 4. A flue connection hole 11 is provided on the wall of the chimney 1 to connect to the flue 2. The flue 2 connects to the flue connection hole 11, allowing flue 2 to communicate with the chimney 1, thus enabling flue gas to enter the chimney 1 through the flue 2. The sealing platform 3 is located inside the chimney 1, below the flue connection hole 11, and is used to seal the lower end of the inner cavity of the chimney 1 to prevent the flue gas entering the chimney 1 from flowing downwards. The anti-corrosion layer 4 is applied to the upper surface of the sealing platform 3 to protect it from corrosion or reduce corrosion, ensuring its service life. Simultaneously, the anti-corrosion layer 4 is applied to the inner wall of the chimney 1 above the sealing platform 3 to protect the chimney 1.

[0040] As can be seen, in this application, by setting an anti-corrosion layer 4 on the inner wall of the chimney 1 and on the sealing platform 3 where it frequently comes into contact with corrosive media, the corrosion resistance of the chimney 1 can be effectively improved, ensuring its service life and structural strength. At the same time, setting the anti-corrosion layer 4 on the inner wall of the chimney 1 has a simple structural process, and compared to building an inner cylinder inside the chimney 1, the production cost is significantly reduced.

[0041] In one embodiment, the anti-corrosion layer 4 can be Bingode. Bingode is applied to the upper surface of the sealing platform 3 and the inner wall of the chimney 1 by adhesive bonding.

[0042] In this application, since the chimney 1 lacks an inner liner, the flue 2 cannot be effectively supported during the connection process between the chimney 1 and the flue 2. Therefore, a cantilever platform 5 is provided on the outer wall of the chimney 1. A support device 6 for supporting the flue 2 is installed on the cantilever platform 5. The cantilever platform 5 and the support device 6 effectively solve the problem of connecting the flue 2 to the chimney 1 without an inner liner, ensuring the stability of the flue 2. This connection method between the flue 2 and the chimney 1 is not only suitable for connecting flues with small spans, but also particularly suitable for connecting flues with large spans, ensuring the stability of the flue installation.

[0043] To simplify the manufacturing process, the sealing platform 3 is a reinforced concrete platform. Additionally, the cantilever platform 5 is also a reinforced concrete platform. To ensure the supporting capacity of the cantilever platform 5, it is constructed as a single unit with the sealing platform 3. Therefore, this arrangement allows the weight of the flue 2 to be transferred to the cantilever platform 5, and then further to the sealing platform 3 and the chimney 1, thus improving the supporting capacity for the flue 2.

[0044] The length of the cantilever platform 5 can be determined according to actual conditions. For example, the length of the cantilever platform 5 (in the length direction of the flue 2) is... Figure 1 The dimension in the left-right direction (in the flue 2) can be taken as 3m. The width of the cantilever platform 5 (in the width direction of the flue 2) is... Figure 2 The vertical dimension is the width of flue 2 plus twice that of 1m. That is, in the width direction of flue 2, 1m is reserved on each side of the cantilever platform 5 relative to flue 2 to facilitate the maintenance of flue 2. The thickness of the cantilever platform 5 is the same as that of the sealing platform 3.

[0045] A first pre-embedded part 51 is embedded in the upper surface of the cantilever platform 5. Multiple first pre-embedded parts 51 are provided, their number and position corresponding to the support device 6 to improve connection stability. Multiple first reinforcing bars 52 are fixed to the first pre-embedded parts 51 to extend into the interior of the cantilever platform 5. This arrangement ensures that the reinforced concrete cantilever platform 5 forms an integral whole with the first pre-embedded parts 51 and the first reinforcing bars 52, improving connection stability, facilitating the construction and connection of the support device 6, and enhancing the support capacity of the support device 6.

[0046] The support device 6 includes side support assemblies 61 for supporting the sides of the flue. For each flue 2 requiring support, there are two sets of side support assemblies 61 for supporting the flue on both sides of its width. Each side support assembly 61 includes a side support plate 611 and side legs 612. The side support plate 611 can be a steel plate and is fixed to a first pre-embedded part 51. Preferably, to reduce the friction between the side support plate 611 and the first pre-embedded part 51, a polytetrafluoroethylene (PTFE) plate 613 is laid flat between them. The PTFE plate 613 can be multi-layered, for example, two layers, as needed. The side legs 612 are cylindrical in shape, for example, square cylindrical. After connection, the side legs 612 are mounted on the support plate 611 and abut against the flue 2 to support the flue 2.

[0047] The support device 6 also includes an intermediate support assembly 62 for supporting the middle side of the width of the flue 2. Depending on the width requirements of the flue 2, multiple or one intermediate support assembly 62 can be provided. In this application, for each flue 2, one intermediate support assembly 62 will be used as an example. Each intermediate support assembly 62 includes a limiting baffle 621, an intermediate support leg 622, and a reinforcing plate 623. There are two limiting baffles 621, which are arranged opposite each other in the width direction of the flue 2. The limiting baffles 621 are fixed to the cantilever platform 5, specifically to the first reserved embedded part 51. The intermediate support leg 622 is located between the two limiting baffles 621. The intermediate support leg 622 extends into the flue 2 to support it. The reinforcing plate 623 is located on the outside of each limiting baffle 621. One side of the reinforcing plate 623 is fixed to the limiting baffle 621, and the other side is located to the first reserved embedded part 51. For each limiting baffle 621, multiple reinforcing plates 623 can be arranged at intervals. Thus, the limiting baffle 621 and the reinforcing plates 623 form a stable structure to support the intermediate support leg 622.

[0048] A second pre-embedded part 53 is provided on the lower end face of the cantilever platform 5. A third pre-embedded part 12 is provided on the wall of the chimney 1. An inclined support 7 is provided between the cantilever platform 5 and the chimney 1. The two ends of the inclined support 7 are respectively connected to the second pre-embedded part 53 and the third pre-embedded part 12. This arrangement connects the cantilever platform to the chimney 1, thereby improving the support capacity of the cantilever platform 5.

[0049] Specifically, the second embedded part 53 is a steel plate structure. A second reinforcing bar 54 extending to the cantilever platform 5 is fixed to the second embedded part 53. The third embedded part 12 consists of two opposing steel plates, one attached to the outer wall of the chimney 1 and the other attached to the inner wall of the chimney 1. A third reinforcing bar 15 is placed between the two third embedded parts 12. The diagonal support 7 can be a steel tubular structure. In the connection, one end of the diagonal support 7 is welded to the second embedded part 53 through a double-sided fillet weld of the node plate, and the other end is welded to one of the third embedded parts 12 through a double-sided fillet weld of the node plate.

[0050] A baffle door 8 and an expansion joint 9 are installed inside the flue 2. Along the length of the flue 2, the baffle door 8 and expansion joint 9 are positioned between the flue connection hole 11 and the support device 6. That is, the baffle door 8 and expansion joint 9 are located directly above the cantilevered platform 5. Therefore, the weight of the flue 2, the baffle door 8, and the expansion joint 9 can be largely transferred to the cantilevered platform 5, ensuring the stability of the flue 2 connection.

[0051] A protruding guide tube 13 is provided at the flue connection hole 11 of the chimney 1. A reserved angle steel ring 14 is provided on the guide tube 13. The reserved angle steel ring 14 is a bent part with an L-shaped cross-section. After installation, one side of the reserved angle steel ring 14 is attached to the inner wall of the guide tube 13, and the other side is attached to the end face of the guide tube 13. The connecting end of the flue 2 extends into the tube formed by the other side of the reserved angle steel ring 14 and is fixed to the reserved angle steel ring 14. Specifically, the connection between the back of the reserved angle steel ring 14 and the outer wall plate of the flue 2 is welded around the flue connection hole 11 with a fillet weld, and the connection between the tip of the reserved angle steel ring 14 and the outer wall plate of the flue 2 is welded around the flue connection hole 11 with a fillet weld. It can be seen that the flue 2 achieves a stable connection with the chimney 1 and can effectively ensure that the flue 2 does not leak. It is easy to understand that the anti-corrosion layer 4 extends to the inner wall of the guide tube 13 to improve the anti-corrosion capability. By setting the guide tube 13, the flue 2 does not penetrate deep into the inner cavity of the chimney 1, which helps to lay the anti-corrosion layer 4 in the inner cavity of the chimney 1 as a whole and ensures the anti-corrosion effect.

[0052] In this application, the inner wall of the chimney 1 is provided with an anti-corrosion layer 4, and it is a cylinderless design, resulting in low engineering and manufacturing costs. The flue 2 is connected to the chimney 1 and is supported by a cantilever platform 5, avoiding the need for supporting structures such as brackets, saving engineering costs, and reducing requirements for installation space. The cantilever platform 5 and the support components 6 can ensure force balance and reasonable force transmission, ensuring the stability of the support for the flue 2.

[0053] In this application, the cantilever platform 5 can also be a steel platform. For example, embedded parts are pre-installed on the outer wall of the chimney 1. Cantilever steel beams are welded onto the pre-installed embedded parts to serve as the foundation support for the steel platform. Steel grating is then laid on the cantilever steel beams. Other component arrangements are foreseeable to those skilled in the art and will not be described in detail here.

[0054] This application also relates to an installation method for a flue gas desulfurization system. Specifically, it involves first performing sub-assembly. A chimney 1 is prepared, and a sealing platform 3 and a cantilever platform 5 are installed on the chimney 1. A support device 6 is installed on the cantilever platform 5, and an outwardly protruding guide cylinder 13 is installed at the flue connection hole 11 of the chimney 1. A reserved angle steel ring 14 is installed on the guide cylinder 13. A flue 2 is prepared, and a baffle door 8 and an expansion joint 9 are installed in the inner cavity of the flue 2. After the sub-assembly is completed, a final assembly is performed. One end of the flue 2 connected to the chimney 1 is attached to the support device 6, and this end of the flue 2 is inserted into the reserved angle steel ring 14. The flue 2 and the reserved angle steel ring 14 are then welded together. Finally, the anti-corrosion layer 4 is laid on the upper surface of the sealing platform 3 and on the inner wall of the chimney 1 above the sealing platform 3 to ensure completeness of the laying and improve corrosion resistance. This anti-corrosion layer 4 is made of Bingode material and is applied to the corresponding locations by adhesive bonding.

[0055] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and / or modifications falling within the scope of the invention, and all changes and / or modifications made according to embodiments of the invention should be covered within the protection scope of the invention.

Claims

1. A flue gas desulfurization system characterized by, The chimney comprises: a chimney wall with a flue connecting hole, a flue connected to the flue connecting hole to make the flue communicate with the chimney, a blocking platform arranged in the inner cavity of the chimney and located at the lower end of the flue connecting hole, a corrosion protection layer arranged on the upper end surface of the blocking platform and on the inner wall of the chimney above the blocking platform, a cantilever platform arranged on the outer wall of the chimney, a support device for supporting the flue is arranged on the cantilever platform, the support device comprises an edge support assembly for supporting the edge side of the flue in the width direction, the edge support assembly comprises an edge support plate fixed on the cantilever platform and an edge support leg arranged on the edge support plate and used for abutting to the flue; the support device further comprises a middle support assembly for supporting the middle side of the flue in the width direction, the middle support assembly comprises two limiting baffle plates arranged opposite in the width direction of the flue, a middle support leg arranged between the two limiting baffle plates and used for extending to the flue, and a reinforcing plate arranged outside each limiting baffle plate, one side of the reinforcing plate is fixed to the limiting baffle plate, and the other side is arranged to the cantilever platform.

2. The flue gas desulfurization system according to claim 1, characterized by, The cantilever platform and the blocking platform are a reinforced concrete integral structure, and a first reserved embedded part is arranged on the cantilever platform to connect the support device.

3. The flue gas desulfurization system of claim 2, wherein, An inclined support is arranged on the lower end surface of the cantilever platform, one end of the inclined support is connected to the outer wall of the chimney.

4. The flue gas desulfurization system of claim 3, wherein A second reserved embedded part is arranged on the lower end surface of the cantilever platform, and a third reserved embedded part is arranged on the wall of the chimney, two ends of the inclined support are respectively connected to the second reserved embedded part and the third reserved embedded part.

5. The flue gas desulfurization system according to claim 1, wherein A baffle door and an expansion joint are arranged in the inner cavity of the flue, and the baffle door and the expansion joint are arranged between the flue connecting hole and the support device in the length direction of the flue.

6. The flue gas desulfurization system according to any one of claims 1 to 5, characterized by, An outwardly protruding guide cylinder is arranged at the flue connecting hole of the chimney, a reserved angle steel ring is arranged on the guide cylinder, the flue extends into the reserved angle steel ring and is fixed with the reserved angle steel ring.

7. A method of installing a flue gas desulfurization system according to any one of claims 1 to 6, characterized in that, The chimney comprises: Step one, sub-assembly, prepare the chimney, arrange the blocking platform and the cantilever platform on the chimney, arrange the support device on the cantilever platform, and arrange the outwardly protruding guide cylinder at the flue connecting hole of the chimney, and arrange the reserved angle steel ring on the guide cylinder; prepare the flue, arrange the baffle door and the expansion joint in the inner cavity of the flue, Step two, total assembly, overlap the one end of the flue connected to the chimney to the support device, insert the flue into the reserved angle steel ring, and weld the flue and the reserved angle steel ring, Step three, lay the corrosion protection layer on the upper end surface of the blocking platform and on the inner wall of the chimney above the blocking platform.

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