Flue gas desulfurization system and installation method of flue gas desulfurization system

Abstract

The invention provides a flue gas desulfurization system and an installation method of the flue gas desulfurization system, and the flue gas desulfurization system comprises: a chimney, the wall of which is provided with a flue connection hole; the flue is connected to the connecting hole, so that the flue is communicated with the chimney; the blocking platform is arranged in the inner cavity of the chimney and located at the lower end of the connecting hole; the anti-corrosion layer is arranged on the upper end face of the plugging platform and arranged on the inner wall of the chimney above the plugging platform, the anti-corrosion capacity of the chimney can be effectively improved by arranging the anti-corrosion layer on the inner wall of the chimney, the service life and the structural strength are guaranteed, meanwhile, the anti-corrosion layer is arranged on the inner wall of the chimney, and the anti-corrosion performance of the chimney is improved. The structural process is simple, and the production cost is obviously reduced compared with the inner cylinder built in the chimney.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal chemical engineering, and particularly relates to a flue gas desulfurization system and an installation method of the flue gas desulfurization system. Background Art

[0002] In the flue gas desulfurization process of a thermal power plant, the flue gas enters the absorption tower through the original flue, makes reverse contact with the slurry in the spray layer and undergoes a desulfurization reaction. The desulfurized clean flue gas is discharged into the chimney through the flue. However, the temperature of the flue gas after desulfurization treatment decreases significantly (usually 45 - 80 °C), the humidity increases greatly, and it contains acidic components such as unreacted SO, HCl, etc. and corrosive media such as sulfurous acid and sulfates. Such a low-temperature, high-humidity, acidic environment is likely to form strongly corrosive acid liquid condensation on the inner wall of the chimney, with its pH value as low as 1 - 2, causing severe chemical erosion and electrochemical corrosion to conventional building materials (such as concrete and ordinary steel), resulting in a decrease in the structural strength of the chimney and a shortening of its service life.

[0003] To address the corrosion problem, the prior art generally adopts the scheme of adding an anti-corrosion inner cylinder in the chimney. It mainly includes a steel inner cylinder structure, a brick-lined inner cylinder, and a fiberglass reinforced plastic inner cylinder, etc. However, when using a steel inner cylinder, corrosion-resistant alloy steel, etc. are also required, with high material costs and welded joints being susceptible to local corrosion. When using acid-resistant bricks or vitrified bricks as the inner lining, silicone rubber sealing and a complex support structure are required, with a long construction period and difficult later maintenance. The fiberglass reinforced plastic inner cylinder, although having the advantage of corrosion resistance, has insufficient resistance to temperature change and is prone to delamination and cracking under the alternating action of high-temperature flue gas (130 - 150 °C) and low-temperature condensed water.

[0004] Although the above schemes can alleviate the corrosion problem in the short term, they significantly increase the construction cost of the chimney, the complexity of materials and construction technology during construction, and the later maintenance, which raises the overall project cost.

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

[0006] In view of some or all of the above technical problems existing in the prior art, the present invention provides a flue gas desulfurization system and an installation method of the flue gas desulfurization system. In this flue gas desulfurization system, an anti-corrosion layer is utilized.

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

[0008] a chimney, on the wall of which a flue connection hole is provided,

[0009] a flue, the flue being connected to the connection hole so that the flue communicates with the chimney,

[0010] A plugging platform, which is arranged in the inner cavity of the chimney and located at the lower end of the connecting hole.

[0011] An anti-corrosion layer, which is arranged on the upper end surface of the plugging platform and on the inner wall of the chimney above the plugging platform.

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

[0013] In one embodiment, the supporting device includes side support components for supporting the side edges in the width direction of the flue, and the side support components include:

[0014] A side support plate fixed on the cantilever platform,

[0015] Side legs, which are arranged on the side support plate and used to abut against the flue.

[0016] In one embodiment, the supporting device includes intermediate support components for supporting the intermediate sides in the width direction of the flue, and the intermediate support components include:

[0017] Limit baffles, there are two limit baffles arranged opposite to each other in the width direction of the flue, and the limit baffles are fixed to the cantilever platform.

[0018] Intermediate legs, which are arranged between the two limit baffles and used to extend to the flue.

[0019] Reinforcing plates, which are arranged outside each limit baffle, one side of the reinforcing plate is fixed to the limit baffle and the other side is arranged on the cantilever platform.

[0020] In one embodiment, the cantilever platform and the plugging platform are of an integral reinforced concrete structure, and a first reserved embedded part is arranged on the cantilever platform for connecting the supporting device.

[0021] In one embodiment, an inclined support is arranged on the lower end surface 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 arranged on the lower end surface of the cantilever platform, a third reserved embedded part is arranged on the wall of the chimney, and both 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 arranged in the inner cavity of the flue. In the length direction of the flue, the baffle door and the expansion joint are arranged between the connection hole and the support device.

[0024] In one embodiment, a guiding cylinder protruding outward is arranged at the connection hole of the chimney, and a reserved angle steel ring is arranged on the guiding 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, there is provided an installation method for a flue gas desulfurization system, including:

[0026] Step 1, sub-assembly: Prepare the chimney, and set a plugging platform and a cantilever platform on the chimney. A support device is arranged on the cantilever platform, and a guiding cylinder protruding outward is arranged at the connection hole of the chimney. A reserved angle steel ring is arranged on the guiding cylinder; Prepare the flue, and a baffle door and an expansion joint are arranged in the inner cavity of the flue.

[0027] Step 2, overall assembly: Connect one end of the flue to the chimney and place it on the support device, insert the flue into the reserved angle steel ring, and weld and connect the flue and the reserved angle steel ring.

[0028] Step 3, lay an anti-corrosion layer on the upper end surface of the plugging platform and on the inner wall of the chimney above the plugging platform.

[0029] Compared with the prior art, the advantages of the present invention are as follows: By arranging an anti-corrosion layer on the inner wall of the chimney, the anti-corrosion ability of the chimney can be effectively improved, ensuring the service life and structural strength. At the same time, arranging an anti-corrosion layer on the inner wall of the chimney has a simple structural process, and compared with building an inner cylinder in the chimney, the production cost is significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings:

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

[0032] Figure 2 is the A-A cross-sectional view from Figure 1 ;

[0033] Figure 3 is the B-B cross-sectional view from Figure 1 ;

[0034] Figure 4 is the C-C cross-sectional view from Figure 2 ;

[0035] Figure 5 is the D-D cross-sectional view from Figure 4 ;

[0036] Figure 6 is the E-E cross-sectional view from Figure 4 .

[0037] In the accompanying drawings, like parts are designated by like reference numerals. The drawings are not drawn to scale. Detailed Description of the Invention

[0038] In order to make the technical solutions and advantages of the present invention more clear and understandable, the exemplary embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than an exhaustive list of all embodiments. And without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0039] An embodiment of the present invention provides a flue gas desulfurization system. As Figures 1 to 6 shown, the flue gas desulfurization system includes a chimney 1, a flue 2, a plugging platform 3, and an anti-corrosion layer 4. Among them, a flue connection hole 11 is provided on the wall of the chimney 1 for connecting the flue 2. The flue 2 is connected to the connection hole 11 so that the flue 2 communicates with the chimney 1, and thus the flue gas enters the chimney 1 through the flue 2. The plugging platform 3 is disposed in the inner cavity of the chimney 1 and is located at the lower end of the connection hole 11 for plugging the lower inner cavity of the chimney 1 to prevent the flue gas entering the chimney 1 from flowing downward. The anti-corrosion layer 4 is disposed on the upper end surface of the plugging platform 3 for protecting the plugging platform 3 from being corroded or reducing corrosion and ensuring the service life. At the same time, the anti-corrosion layer 4 is disposed on the inner wall of the chimney 1 above the plugging platform 3 for protecting the chimney 1.

[0040] It can be seen that in the present application, by providing the anti-corrosion layer 4 on the inner wall of the chimney 1 and at the places on the plugging platform 3 that often come into contact with the corrosive medium, the corrosion resistance of the chimney 1 can be effectively improved, and the service life and structural strength can be ensured. At the same time, by providing the anti-corrosion layer 4 on the inner wall of the chimney 1, the structural process is simple, and compared with building an inner cylinder in the chimney 1, the production cost is significantly reduced.

[0041] In one embodiment, the anti-corrosion layer 4 can be Penguard. Penguard is provided on the upper end surface of the plugging platform 3 and the inner wall of the chimney 1 by pasting.

[0042] In this application, since there is no inner cylinder in the inner cavity of the chimney 1, 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 provided 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 cylinder, ensuring the stability of the flue 2. This connection method between the flue 2 and the chimney 1 is applicable not only to the connection of small-span flues but also especially to the connection of large-span flues, and ensures the stability of flue installation.

[0043] To simplify the manufacturing process, the plugging platform 3 is a reinforced concrete platform. In addition, the cantilever platform 5 is also a reinforced concrete platform. To ensure the supporting capacity of the cantilever platform 5, the cantilever platform 5 and the plugging platform 3 are constructed as an integral body. Thus, the above settings can transfer the gravity of the flue 2 to the cantilever platform 5, and then to the plugging platform 3 and the chimney 1, improving the supporting capacity for the flue 2.

[0044] The length of the cantilever platform 5 can be determined according to the actual situation. For example, the length of the cantilever platform 5 (the dimension in the left-right direction in the length direction of the flue 2 Figure 1 can be taken as 3 m. The width of the cantilever platform 5 (the dimension in the up-down direction in the width direction of the flue 2 Figure 2 is the width of the flue 2 plus twice 1 m, that is, in the width direction of the flue 2, 1 m is reserved on each side of the cantilever platform 5 relative to the flue 2, which is convenient for the maintenance of the flue 2. The thickness of the cantilever platform 5 is the same as that of the plugging platform 3.

[0045] A first reserved embedment 51 is embedded in the upper surface of the cantilever platform 5. There are multiple first reserved embedments 51, and the quantity and positions are used to correspond to the support device 6 to improve the connection stability. A plurality of first steel bars 52 are fixed on the first reserved embedment 51 for extending into the interior of the cantilever platform 5. The above settings are used to ensure that the reinforced concrete cantilever platform 5 forms an integral body with the first reserved embedment 51 and the first steel bars 52, improving the connection stability, facilitating the construction connection of the support device 6, and improving the supporting 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 to be supported, there are two sets of side support assemblies 61 for supporting the flue at both sides of the 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 the first pre-embedded part 51. Preferably, in order to reduce the friction between the side support plate 611 and the first pre-embedded part 51, a polytetrafluoroethylene plate 613 is laid between them. According to needs, the polytetrafluoroethylene plate 613 can be multi-layered, for example, two layers. The side legs 612 are constructed in a tubular shape by themselves, such as a square tubular shape. After connection, the side legs 612 are arranged on the support plate 611 and are used to abut against the flue 2 to support the flue 2.

[0047] The support device 6 further includes an intermediate support assembly 62 for supporting the middle side of the width of the flue 2. According to the width requirement of the flue 2, multiple or one intermediate support assembly 62 can be provided. In this application, for each flue 2, taking the setting of one intermediate support assembly 62 as an example for description. Each intermediate support assembly 62 includes a limit baffle 621, intermediate legs 622 and a reinforcement plate 623. There are two limit baffles 621, which are arranged opposite to each other in the width direction of the flue 2. The limit baffles 621 are fixed to the cantilever platform 5, specifically to the first pre-embedded part 51. The intermediate legs 622 are arranged between the two limit baffles 621. The intermediate legs 622 are used to extend onto the flue 2 to support the flue 2. The reinforcement plate 623 is arranged outside each limit baffle 621. One side of the reinforcement plate 623 is fixed to the limit baffle 621 and the other side is arranged to the first pre-embedded part 51. Multiple spaced-apart reinforcement plates 623 can be provided corresponding to one limit baffle 621. Thus, the limit baffle 621 and the reinforcement plate 623 form a stable structure for supporting the intermediate legs 622.

[0048] A second pre-embedded part 53 is provided on the lower end surface 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. Through this setting, the cantilever platform is connected to the chimney 1, thereby improving the support capacity of the cantilever platform 5.

[0049] Specifically, the second reserved embedded part 53 is of steel plate structure. A second steel bar 54 extending to the cantilever platform 5 is fixed on the second reserved embedded part 53. The third reserved embedded part 12 is composed of two relatively arranged steel plates, one of which is attached to the outer wall of the chimney 1 and the other is attached to the inner wall of the chimney 1. A third steel bar 15 is arranged between the two third reserved embedded parts 12. The inclined support 7 can be of tubular structure. In the connection, one end of the inclined support 7 is welded to the second reserved embedded part 53 by double-sided fillet weld with a node plate, and the other end is welded to one of the third reserved embedded parts 12 by double-sided fillet weld with a node plate.

[0050] A baffle door 8 and an expansion joint 9 are arranged in the inner cavity of the flue 2. In the length direction of the flue 2, the baffle door 8 and the expansion joint 9 are arranged between the connection hole 11 and the support device 6. That is to say, the baffle door 8 and the expansion joint 9 are located directly above the general cantilever platform 5. It can be seen that most of the weights of the flue 2, the baffle door 8 and the expansion joint 9 can act on the cantilever platform 5 to ensure the connection stability of the flue 2.

[0051] A guiding cylinder 13 protruding outward is arranged at the connection hole 11 of the chimney 1. A reserved angle steel ring 14 is arranged on the guiding cylinder 13. The reserved angle steel ring 14 is constructed as 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 guiding cylinder 13 and the other side is attached to the end face of the guiding cylinder 13. The connection end of the flue 2 extends into the cylinder formed by the other side of the reserved angle steel ring 14 and is fixed to the reserved angle steel ring 14. Specifically, fillet welds are used to weld around the connection hole 11 at the connection between the back of the limb of the reserved angle steel ring 14 and the outer wall plate of the flue 2, and fillet welds are used to weld around the connection hole 11 at the connection between the tip of the limb of the reserved angle steel ring 14 and the outer wall plate of the flue 2. It can be seen that the flue 2 realizes 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 guiding cylinder 13 to improve the anti-corrosion ability. By arranging the guiding cylinder 13, the flue 2 does not extend deep into the inner cavity of the chimney 1, which helps the overall laying of the anti-corrosion layer 4 in the inner cavity of the chimney 1 and ensures the anti-corrosion effect.

[0052] In this application, an anti-corrosion layer 4 is arranged on the inner wall of the chimney 1, and it is a design without an inner cylinder, with low engineering production cost. The flue 2 is connected to the chimney 1 and is supported by the cantilever platform 5, avoiding the setting of structures such as support brackets, saving project cost, and having low requirements for installation space, etc. The setting of the cantilever platform 5 and the support assembly 6 can ensure force balance, reasonable force transmission, and ensure the support stability of the flue 2.

[0053] In this application, the cantilever platform 5 can also be a steel platform. For example, installation embedded parts are reserved on the outer wall of the chimney 1. The cantilever steel beam is welded to the reserved installation embedded parts to serve as the basic support of the steel platform. Then, the steel grating is laid on the cantilever steel beam. The setting of other components can be foreseen by those skilled in the art and will not be elaborated here.

[0054] This application also relates to an installation method of a flue gas desulfurization system. Specifically, first, sub-assembly is carried out. The chimney 1 is prepared, and the plugging platform 3 and the cantilever platform 5 are arranged on the chimney 1. The supporting device 6 is arranged on the cantilever platform 5, and the outwardly protruding guiding cylinder 13 is arranged at the connection hole 11 of the chimney 1. The reserved angle steel ring 14 is arranged on the guiding cylinder 13; the flue 2 is prepared, and the baffle door 8 and the expansion joint 9 are arranged in the inner cavity of the flue 2. After the sub-assembly is completed, the general assembly is carried out. One end of the flue 2 connected to the chimney 1 is lapped on the supporting device 6, and this end of the flue 2 is inserted into the reserved angle steel ring 14, and the flue 2 and the reserved angle steel ring 14 are welded and connected. Finally, the anticorrosive layer 4 is laid on the upper end surface of the plugging platform 3 and the inner wall of the chimney 1 above the plugging platform 3 to ensure the completeness of the laying and improve the anticorrosive ability. The anticorrosive layer 4 is Bing Gaode, and it is arranged at the corresponding position by means of bonding.

[0055] Although the preferred embodiments of the present invention have been described, once those skilled in the art learn the basic creative concept, additional changes and modifications can be made 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 present invention. All changes and / or modifications made according to the embodiments of the present invention should be covered within the protection scope of the present invention.

Claims

1. A flue gas desulfurization system, characterized in that, Comprising: A chimney, on the wall of which a flue connection hole is provided, A flue, which is connected to the connection hole so that the flue communicates with the chimney, A plugging platform, which is arranged in the inner cavity of the chimney and is located at the lower end of the connection hole, An anti-corrosion layer, which is arranged on the upper end surface of the plugging platform and on the inner wall of the chimney above the plugging platform.

2. The flue gas desulfurization system according to claim 1, characterized in that, A cantilever platform is arranged on the outer wall of the chimney, and a supporting device for supporting the flue is arranged on the cantilever platform.

3. The flue gas desulfurization system according to claim 2, wherein The supporting device includes a side supporting assembly for supporting the side edges in the width direction of the flue, and the side supporting assembly includes: A side support plate fixed on the cantilever platform, Side legs, which are arranged on the side support plate and are used to abut against the flue.

4. The flue gas desulfurization system according to claim 3, characterized in that The supporting device includes an intermediate supporting assembly for supporting the intermediate side in the width direction of the flue, and the intermediate supporting assembly includes: Limit baffles, there are two limit baffles which are arranged opposite to each other in the width direction of the flue, and the limit baffles are fixed to the cantilever platform, Intermediate legs, which are arranged between the two limit baffles and are used to extend to the flue, Reinforcing plates, which are arranged outside each limit baffle, one side of the reinforcing plate is fixed to the limit baffle and the other side is arranged on the cantilever platform.

5. The flue gas desulfurization system according to any one of claims 2 to 4, characterized in that, The cantilever platform and the plugging platform are of an integral reinforced concrete structure, and a first reserved embedded part is arranged on the cantilever platform for connecting the supporting device.

6. The flue gas desulfurization system according to claim 5, characterized in that, An inclined support is arranged on the lower end surface of the cantilever platform, and one end of the inclined support is connected to the outer wall of the chimney.

7. The flue gas desulfurization system according to claim 6, 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. The two ends of the inclined support are respectively connected to the second reserved embedded part and the third reserved embedded part.

8. The flue gas desulfurization system according to any one of claims 2 to 7, characterized in that, A baffle door and an expansion joint are arranged in the inner cavity of the flue. In the length direction of the flue, the baffle door and the expansion joint are arranged between the connection hole and the supporting device.

9. The flue gas desulfurization system according to any one of claims 1 to 8, characterized in that, A guiding cylinder protruding outwards is arranged at the connection hole of the chimney, and a reserved angle steel ring is arranged on the guiding cylinder. The flue extends into the reserved angle steel ring and is fixed to the reserved angle steel ring.

10. An installation method for a flue gas desulfurization system, characterized in that, Comprising: Step 1, sub-assembly: Prepare the chimney, and arrange a plugging platform and a cantilever platform on the chimney. A supporting device is arranged on the cantilever platform, and a guiding cylinder protruding outwards is arranged at the connection hole of the chimney. A reserved angle steel ring is arranged on the guiding cylinder; Prepare the flue, and arrange a baffle door and an expansion joint in the inner cavity of the flue, Step 2, general assembly: Connect one end of the flue to the chimney and place it on the supporting device, insert the flue into the reserved angle steel ring, and weld and connect the flue and the reserved angle steel ring, Step 3, lay an anti-corrosion layer on the upper end surface of the plugging platform and on the inner wall of the chimney above the plugging platform.

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