A desulfurization chimney titanium composite plate inner cylinder anticorrosion structure and a construction process thereof

Abstract

The application discloses a kind of desulfurization chimney titanium composite board inner cylinder anticorrosion structure and its construction technology, including titanium composite board inner cylinder, the titanium composite board inner cylinder is sequentially spliced from top to bottom by multiple annular cylinder bodies, the annular cylinder body includes steel base plate, titanium plate lining is arranged on the inner side of the steel base plate, titanium strip is covered on the vertical continuous weld and annular weld arranged on the titanium plate lining, the surface of the titanium strip, the surface of the titanium strip and the titanium plate are sequentially covered with titanium plate primer and photocuring nanosheet layer;The annular cylinder body is arranged on first operating frame and second operating frame on the side of first operating frame, and a crawling passage assembly is arranged between the first operating frame and the second operating frame.The application uses the above-mentioned desulfurization chimney titanium composite board inner cylinder anticorrosion structure and its construction technology, enhances corrosion resistance, guarantees the stability of base material, shortens construction period, and reduces cost.

Description

Technical Field

[0001] This invention relates to the field of anti-corrosion technology for desulfurization chimneys, and in particular to an anti-corrosion structure for the inner cylinder of a desulfurization chimney made of titanium composite plate and its construction process. Background Technology

[0002] The outer casing of the desulfurization chimney is a reinforced concrete structure, with a suspended titanium composite plate inner casing inside. The number of inner casings can be adjusted according to requirements. Typically, the total height of the chimney can reach 180-240m, and the net height of the titanium composite plate inner casing can reach 140-200m. The diameter varies depending on the number of inner casings. Chimney corrosion protection is of paramount importance in power plant corrosion protection. Although the titanium composite plate inner casing process is expensive, it performs well in the lime slurry wet desulfurization flue gas environment.

[0003] The titanium plate composite inner cylinder uses carbon steel as the base material, with a layer of titanium plate bonded to the inside of the carbon steel using an explosive bonding method. Titanium plates have excellent corrosion resistance, but they are expensive, typically thin, and have low strength. Carbon steel, on the other hand, has a thicker, stronger, and cheaper layer, but poorer corrosion resistance. Therefore, carbon steel can be used as the load-bearing and bending-resistant base material for the inner cylinder, while titanium plates serve as the inner anti-corrosion material, resulting in a titanium plate composite inner cylinder. The chimney is formed by stacking and welding concentric rings, creating annular joints. These rings are formed by bending carbon steel and titanium plates, and each ring has a vertical joint. The annular and vertical joints are welded together.

[0004] Since the titanium layer of the composite plate is generally only 1.2mm thick, the welding technology is very demanding. Welding can easily damage the thin titanium plate on the surface and can also easily produce defects such as micro-cracks, lack of fusion, porosity, and slag inclusions. In order to further improve the corrosion resistance and durability of the titanium plate weld, titanium composite plates need to be protected by secondary welding with titanium strips. Usually, the titanium strip covers the primary weld of the titanium plate, and secondary welding is performed at the edge of the titanium strip and the titanium plate.

[0005] The secondary welding area is a weak point in the corrosion protection of titanium composite plates. During operation, it's impossible to constantly inspect the inner cylinder of the chimney, and even short-term annual maintenance cannot cover all repairs. Over time, this leads to several hidden dangers: First, achieving uniformity in the secondary welding process is difficult, resulting in inconsistent quality. Furthermore, to avoid welding through the titanium plate, the secondary weld seam cannot be too wide. Therefore, the secondary weld seam area is a weak point and a potential source of corrosion after prolonged use. Generally, after two to three years of use, leakage and corrosion will occur in the secondary weld seam area, with corrosive liquid seeping into the outer insulation material of the titanium cylinder and directly eroding the carbon steel cylinder wall on the back, causing structural safety hazards. Second, the wetting and corrosion of the cylinder wall insulation material will also severely affect the insulation effect, leading to a drop in flue gas temperature and a significant increase in water accumulation at the bottom of the chimney. Third, flue gas leakage fails to meet current environmental regulations.

[0006] Traditionally, the maintenance method for corrosion and leakage in the secondary welding area of ​​titanium chimneys involved shutting down the machine to repair the leaks by welding titanium strips or thin titanium plates. However, due to the risks of working at heights, a safer and more reliable method is currently using a suspended platform. The process from platform assembly to normal operation takes approximately 15-20 days, followed by another 15-20 days for inspection, repair welding, and re-inspection. After acceptance, the platform is disassembled and the chimney is ready for operation for approximately 3-5 days. This requires a maintenance team of 5-8 people. The wages for high-altitude workers are estimated at 600 yuan per person per day, and the cost of the suspended platform is estimated at 100,000 yuan. Adding the cost of welding materials, the total cost of each repair can reach hundreds of thousands of yuan, representing a huge expenditure of manpower, resources, and time. Therefore, traditional maintenance processes are costly and time-consuming. Moreover, the welding of new titanium strips or thin titanium plates used for repairs can easily damage the original thin titanium layer, creating new corrosion risks and causing leakage problems to recur.

[0007] In addition to the above-mentioned problems, the existing construction method of titanium composite plate inner cylinder is to assemble and splice the chimney in sections. The inner and outer surfaces of the spliced ​​inner cylinder are welded and treated with anti-corrosion by clamping the brackets at the top of the outer cylinder and suspending the basket from the brackets. Workers need to hold high-altitude work permits to work, so the requirements for workers are high. Moreover, due to the great height of the inner cylinder, the high-altitude work is dangerous. During the operation, there are problems such as insufficient internal welding space, poor air circulation and difficulty in aligning the cylinder. Summary of the Invention

[0008] The purpose of this invention is to provide a corrosion-resistant structure for the inner cylinder of a desulfurization chimney made of titanium composite plate and its construction process, which enhances corrosion resistance, ensures the stability of the substrate, shortens the construction cycle, and reduces costs.

[0009] To achieve the above objectives, the present invention provides a corrosion-resistant structure for a titanium composite plate inner cylinder of a desulfurization chimney and its construction process, comprising a titanium composite plate inner cylinder, wherein the titanium composite plate inner cylinder is formed by splicing multiple annular cylinders from top to bottom, the annular cylinders comprising a steel base plate, a titanium plate liner provided on the inner side of the steel base plate, a titanium strip provided on the inner side of the titanium plate liner, and the surface of the titanium strip and the joint between the titanium strip and the titanium plate liner being sequentially covered with a titanium plate undercoating layer and a photocurable nanosheet layer;

[0010] The annular cylinder is disposed on the first operating frame and the second operating frame on one side of the first operating frame, and the first operating frame and the second operating frame are symmetrically distributed.

[0011] Preferably, a crawling channel assembly is provided between the first operating frame and the second operating frame. An air guide pipe is provided on the crawling channel assembly. A counterflow hood is provided above the air guide pipe. A fan is provided below the air guide pipe. The fan is located below the first positioning assembly. The top of the air guide pipe is higher than the fourth platform.

[0012] Preferably, the first operating frame is provided with a first platform, a second platform, a third platform and a fourth platform in sequence from bottom to top.

[0013] Preferably, a first positioning component is provided on the first layer platform, and a second positioning component is provided on the bottom surface of the fourth layer platform.

[0014] Preferably, the vertical welding between the titanium plate liners forms a second vertical weld, the circumferential welding between the titanium plate liners forms a first annular weld, and the titanium strip is connected to the titanium plate liners at the first vertical weld and the first annular weld.

[0015] Preferably, a lifting component is provided at the top of the first operating frame, and the lifting component is connected to the inner cylinder of the titanium composite plate.

[0016] Preferably, an annular airbag is provided below the third and fourth platforms. The annular airbag is connected to an integrated inflation and deflation pump. When the annular airbag is fully inflated, it fits against the inner wall of the titanium composite plate inner cylinder.

[0017] Furthermore, this includes the following steps:

[0018] (1) The steel base plate and the titanium plate lining are rolled into an arc plate with a corresponding arc. The arc titanium composite plate is formed by combining them. The first operating frame and the second operating frame are respectively erected on the bottom surface of the chimney outer cylinder.

[0019] (2) The arc-shaped titanium composite plate is transported to the first operating frame and its steel base plate is welded together to form a single-section annular cylinder. The connection of the steel base plates of each arc-shaped titanium composite plate forms the first vertical weld.

[0020] (3) Lift the enclosed and welded single-section annular cylinder to a height of more than one section using the lifting assembly, and at the same time place the new arc-shaped titanium composite plate on the first platform again, repeating step (2).

[0021] (4) The single-section annular cylinder formed in step (3) is brought into contact with the annular cylinder in step (2) by the first positioning component, and the two are aligned after being finely adjusted in the horizontal direction by the second positioning component.

[0022] (5) Weld the connection of the titanium plate liner inside the annular cylinder formed in step (2) to form a second vertical weld. Weld the titanium plate liner and the steel base plate at the connection between the annular cylinder formed in step (3) and the annular cylinder in step (2) to form a first annular weld and a second annular weld. At the same time, splice and weld small pieces of titanium strips to make the first annular weld and the second vertical weld the same size. At the same time, weld the spliced ​​titanium strips at the second vertical weld and the first annular weld.

[0023] (6) At the same time, the titanium strip is subjected to light curing anti-corrosion treatment, and the insulation layer of the spliced ​​annular cylinder is treated on the second operating frame to form a titanium composite plate inner cylinder.

[0024] (7) Repeat steps (2) to (6).

[0025] Preferably, steps (2) to (6) can be performed simultaneously.

[0026] Therefore, the present invention employs the above-mentioned anti-corrosion structure and construction process for the titanium composite inner cylinder of a desulfurization chimney, and its technical effects are as follows:

[0027] (1) Photocurable nanosheets have excellent chemical corrosion resistance, ensuring the long-term stability of the substrate and providing good anti-corrosion, protection and reinforcement functions.

[0028] (2) Photocurable nanosheets are used as the anti-seepage reinforcement material for the secondary welding area. Combined with the excellent anti-corrosion performance of the titanium plate itself, the composite anti-corrosion structure can provide long-term protection, short construction period, low cost and low price.

[0029] (3) With the assistance of multi-layered internal and external operating frames, the welding of the first layer of annular cylinder substrate, the welding of the second layer of annular cylinder titanium strips, and the anti-corrosion treatment of the third layer of annular cylinder were realized. The assembly line operation was carried out, the air circulation inside the cylinder was good, the positioning was convenient, and the construction efficiency was greatly improved.

[0030] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the anti-corrosion structure of the titanium composite plate inner cylinder of a desulfurization chimney in the present invention and its construction process.

[0032] Figure 2 This is a three-dimensional structural schematic diagram of a construction platform for a desulfurization chimney titanium composite plate inner cylinder anti-corrosion structure according to the present invention.

[0033] Figure 3 This is an enlarged schematic diagram of part a in the anti-corrosion structure of the inner cylinder of the desulfurization chimney made of titanium composite plate and its construction process of the present invention.

[0034] Figure 4 This is an enlarged schematic diagram of part b in the anti-corrosion structure of the inner cylinder of the desulfurization chimney with titanium composite plate according to the present invention and its construction process.

[0035] Figure 5 This is an enlarged schematic diagram of part c in the anti-corrosion structure of the inner cylinder of the desulfurization chimney and its construction process of the present invention.

[0036] Figure Labels

[0037] 1. Annular cylinder; 110. Steel substrate; 120. Titanium plate lining; 130. Titanium strip; 140. Titanium plate base coating; 150. Photocurable nanosheet layer; 160. Thermal insulation layer;

[0038] 2. First operating frame; 210. First-level platform; 220. Second-level platform; 230. Third-level platform; 240. Fourth-level platform; 3. Second operating frame;

[0039] 4. First positioning component; 410. Hydraulic jack; 420. Positioning block; 430. Pneumatic rod; 5. Second positioning component; 510. Second slide rail; 520. Drive motor; 530. Screw; 540. Second slider; 550. Push rod; 560. Push block;

[0040] 6. Lifting assembly; 610. Lifting cylinder; 620. Lifting lug; 630. Lifting sling; 7. Crawler channel assembly; 710. Air duct; 720. Reverse flow hood; 730. Fan;

[0041] 8. First circumferential weld; 9. First vertical weld; 10. Second vertical weld; 11. Ladder; 12. Circular track; 13. Suspension bracket; 14. Titanium composite inner cylinder. Detailed Implementation

[0042] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0043] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. These other embodiments are also covered within the scope of protection of this invention.

[0046] It should also be understood that the specific embodiments described above are only used to explain the present invention, and the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0047] The terms "comprising" or "including" as used in this invention mean that the element preceding the term encompasses the element listed after the term, and do not exclude the possibility of encompassing other elements. Terms such as "inner," "outer," "upper," and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. In this invention, unless otherwise explicitly specified and limited, the term "attached" and similar terms should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two elements or the interaction relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. The term “about” as used in this invention has a meaning known to those skilled in the art, and preferably refers to the numerical value modified by the term within the range of ±50%, ±40%, ±30%, ±20%, ±10%, ±5%, or ±1%.

[0048] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as being interpreted with idealized or highly formalized meanings, unless expressly defined herein.

[0049] Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0050] All prior art documents cited in this specification are incorporated herein by reference in their entirety and are therefore part of the disclosure of this invention.

[0051] Example 1

[0052] As shown in the figure, the present invention provides a corrosion-resistant structure for a titanium composite plate inner cylinder of a desulfurization chimney and its construction process, including a titanium composite plate inner cylinder 14, which is formed by splicing multiple annular cylinders 1 from top to bottom. The annular cylinder 1 includes a steel base plate 110, a titanium plate liner 120 is provided on the inner side of the steel base plate 110, and a heat insulation layer 160 is provided on the outer side of the steel base plate 110. Titanium strips 130 are provided on the inner side of the titanium plate liner 120. Vertical welding between titanium plate liners 120 forms a second vertical weld 10, and circumferential welding between titanium plate liners 120 forms a first annular weld 8. Titanium strips 130 are connected to titanium plate liners 120 at the first vertical weld 9 and the first annular weld 8. The surface of titanium strips 130 and the surface of the connection between titanium strips 130 and titanium plate liners 120 are sequentially covered with a titanium plate undercoating 140 and a photocurable nanosheet layer 150.

[0053] Photocurable nanosheets possess excellent chemical corrosion resistance, nanoscale resistance to corrosion media penetration, temperature resistance, resistance to alternating hot and cold temperatures, wear and erosion resistance, crack and impact resistance, fatigue resistance, and long service life. They can fundamentally prevent the penetration and convection of corrosive media or air within and outside the layer, ensuring the long-term stability of the substrate and providing excellent anti-corrosion, protection, and reinforcement functions. Using photocurable nanosheets as a seepage-proof reinforcement material in the secondary welding area, combined with the excellent anti-corrosion properties of the titanium plate itself, the composite anti-corrosion structure can provide long-lasting protection, short construction cycle, low cost, and low price.

[0054] The annular cylinder 1 also includes a heat insulation layer 160 covering the outer surface of the steel substrate 110, so that the annular cylinder 1 still has good fatigue resistance, temperature resistance, and resistance to alternating hot and cold environments even in environments with large temperature differences.

[0055] The annular cylinder 1 is set on the first operating frame 2 and the second operating frame 3 on one side of the first operating frame 2. The first operating frame 2 and the second operating frame 3 are symmetrically distributed. The first operating frame 2 is provided with a first platform 210, a second platform 220, a third platform 230 and a fourth platform 240 from bottom to top.

[0056] A crawling channel assembly 7 is provided between the first operating frame 2 and the second operating frame 3. A ladder 11 is provided between the platforms on each level of the first operating frame 2 and the second operating frame 3. The ladder 11 is located on one side of the crawling channel assembly 7. An air guide pipe 710 is provided on the crawling channel assembly 7. A reverse flow hood 720 is provided above the air guide pipe 710, and a fan 730 is provided below it. The fan 730 is located below the first positioning assembly 4. The top of the air guide pipe 710 is higher than the height of the fourth platform 240.

[0057] The air duct 710 lifts outside air to the top counterflow hood 720. Guided by the counterflow hood 720, the air flows downwards to supply air to the titanium composite inner cylinder 14 below. This avoids the risk of oxygen deficiency and poisoning for operators working inside the titanium composite inner cylinder 14, which would otherwise be caused by the continuous increase in height during the splicing process, leading to poor air circulation. In addition, welding and anti-corrosion material construction consume oxygen and produce harmful gases.

[0058] The first positioning component 4 is provided on the first platform 210. The first positioning component 4 is ring-shaped and has a hydraulic jack 410 at the bottom to realize the lifting function. It is also provided with multiple positioning blocks 420. The two ends of the positioning blocks 420 are respectively provided with rubber pads and air rods 430. The multiple first positioning components 4 are distributed at equal angles with the center of the first platform 210 as the axis. The top of the annular cylinder 1 at the top of the titanium composite inner cylinder 14 has an outwardly protruding outer edge.

[0059] The height of the first positioning component 4 above the ground is 1.2-1.5m. The maximum stroke of the hydraulic jack 410 driving the first positioning component 4 to rise and fall is 1-1.2m. The column at the bottom of the second platform 220 on the first operating frame 2 passes through the middle of the first positioning component 4 and is supported on the bottom surface.

[0060] The second platform 220 of the first operating frame 2 is equipped with a circular track, on which a manual hoist for hoisting the arc-shaped titanium composite plate is mounted. A first slide rail is provided on one side of the manual hoist, and a first slider is mounted on the first slide rail. The manual hoist is used to suspend the annular inner cylinder 1, and the first slider moves to one end of the first slide rail to fix the annular inner cylinder.

[0061] Multiple annularly arranged second positioning components 5 are provided on the bottom surface of the fourth-layer platform 240. Second slide rails 510 on the second positioning components 5 are connected to the lower surface of the fourth-layer platform 240. A drive motor 520 is located below the second slide rails 510. A screw 530 is provided at one end of the drive motor 520. A threaded second slider 540 is fitted onto the screw 530. The upper end of the second slider 540 is connected to the second slide rail 510, and a top rod 550 at its lower end is vertically connected to a top block 560. The top block 550 is connected to the titanium composite inner cylinder 14. The screw 530 is driven to rotate by the drive motor 520, causing the second slider 540 to move laterally on the second slide rail 510, thereby pushing the top block 560 to move. This allows the titanium composite inner cylinder 14 to be horizontally adjusted to align with the center of the annular inner cylinder 1 below.

[0062] An annular airbag is installed below the third platform 230 and the fourth platform 240. The annular airbag is connected to an integrated inflation and deflation pump. When the annular airbag is fully inflated, it fits against the inner wall of the titanium composite plate inner cylinder 14.

[0063] Because the UV-curing anti-corrosion treatment requires the application of a primer, which may drip down and affect the normal construction work of personnel on the lower layer, and the welding of titanium strips will generate sparks that will splash up and down and affect the work of personnel on other layers, and the welding glare will also affect the work of personnel on other layers, the inner layer construction is carried out by using an integrated inflation and deflation pump to inflate the annular airbag and make it fit against the inner cylinder of the titanium composite plate. Therefore, the inner platform and the inner cylinder are in a fitted state at this time, which can minimize the impact between construction personnel on different layers. When it is necessary to move the inner cylinder of the titanium composite plate, the annular airbag is deflated to make it fit against the inner wall. The outer wall of the annular airbag is covered with a layer of fireproof material.

[0064] A lifting assembly 6 is installed at the top of the first operating frame 2, and the lifting assembly 6 is connected to the titanium composite plate inner cylinder 14. A lifting cylinder 610 is installed on the lifting assembly 6. The lifting cylinder 610 is welded to the top of the titanium composite plate inner cylinder 14 with an outwardly protruding outer edge. A lifting point opening is provided on the lifting cylinder 610, and a lifting lug 620 welded to the annular cylinder 1 is provided inside the lifting point opening. The top of the lifting lug 620 is connected to the lifting cylinder 610, and a sling 630 for lifting the titanium composite plate inner cylinder 14 is provided on the lifting lug 620. A suspension bracket 13 is provided at the top of the chimney outer cylinder, and the top of the sling 630 is fixed to the suspension bracket 13. The sling 630 is lifted by an external lifting device. The lifting cylinder 610 evenly distributes the tension of the sling 630 to the entire titanium composite plate inner cylinder 14. The lifting cylinder 610 is welded to the topmost titanium composite plate inner cylinder 14 to avoid the risk of breakage due to excessive load at the weld between the lifting lug 620 and the annular cylinder 1.

[0065] Between the first platform 210 and the second platform 220, the outer surface steel substrate 110 of the arc-shaped titanium composite plate is welded to form an annular cylinder 1, forming a first vertical weld 9. Between the second platform 220 and the third platform 230, the following operations are performed: (1) the titanium plate lining 120 of one annular cylinder 1 is welded to form a second vertical weld 10; (2) the titanium plate lining 120 between the annular cylinders 1 is welded to form a first annular weld 8; (3) titanium strips 130 are spliced ​​and welded into long strips and rings respectively; (4) the spliced ​​and welded long strip titanium strips 130 and ring titanium strips 130 are welded to the second vertical weld 10 and the first annular weld 8 respectively. A light-curing anti-corrosion treatment is performed between the third platform 230 and the fourth platform 240.

[0066] Simultaneously, the welding of the first vertical weld 9 of the annular cylinder 1 between the first-layer platform 210 and the second-layer platform 220, the welding of longitudinal titanium strips 130 on the vertical connection seams of titanium strips 130 and titanium plate liners 120 inside the annular cylinder 1 between the second-layer platform 220 and the third-layer platform 230, and the light-curing anti-corrosion treatment of the longitudinal titanium strips 130 on the surfaces of the third-layer platform 230 and the fourth-layer platform 240 are carried out. This multi-layer design allows for simultaneous, streamlined operations, improving work efficiency.

[0067] The construction process for the anti-corrosion structure of the titanium composite plate inner cylinder of the desulfurization chimney includes the following steps:

[0068] I. Preparation of the arc-shaped titanium composite plate and construction of the first and second operating frames

[0069] A steel substrate 110 and a titanium liner 120 are rolled into an arc-shaped plate with a corresponding curvature. The arc-shaped steel substrate 110 and titanium liner 120 are then bonded together using an explosive bonding method to form an arc-shaped titanium composite plate. A first operating frame 2 and a second operating frame 3 are respectively erected on the bottom surface inside the outer casing of the chimney. Simultaneously, a suspension bracket 13 and an external lifting device are erected at the top of the outer casing of the chimney. The first positioning component 4 is installed on the first operating frame 2. The arc-shaped titanium composite plate is hoisted onto a manual hoist, and the first slider moves towards the arc-shaped titanium composite plate to fix it. The arc-shaped titanium composite plate is suspended on the first operating frame 2, and the inner side of the arc-shaped titanium composite plate abuts against the positioning block for positioning.

[0070] II. Enclosing and Assembling the Circular Cylindrical Body

[0071] (1) Weld the steel base plate 110 of the positioned arc-shaped titanium composite plate to form a single-section annular cylinder 1, and form a first vertical weld 10 at the connection of the steel base plate 110 of each arc-shaped titanium composite plate.

[0072] (2) The enclosed and welded annular cylinder 1 is lifted up by more than one section using the lifting assembly, and the new arc-shaped titanium composite plate is placed on the first platform 210 again. Step (1) is repeated.

[0073] (3) The single-section annular cylinder 1 formed in step (2) is brought into contact with the annular cylinder 1 in step (1) by the first positioning component 4 and the lifting component 6. The two are then finely adjusted in the horizontal direction by the second positioning component 5 so that their centers are aligned. With the assistance of the first positioning component 4 and the lifting component 6, the upper annular cylinder 1 and the single-section annular cylinder 1 of the first layer platform 210 can be moved to the space between the first layer platform 210 and the second layer platform 220, so that the first vertical weld 9 is completely between the platforms, which is convenient for the operator to carry out related construction work. Then, the upper annular cylinder 1 and the annular cylinder 1 of the first layer platform 210 are lifted, and the first annular weld 8 is moved to a space 1m away from the second layer platform 220, which is convenient for the operator to process the first annular gap 8 and the second vertical weld 10.

[0074] (4) Weld the titanium plate liner 120 on the inner side of the annular cylinder 1 formed in step (1) between the second platform 220 and the third platform 230 to form a second vertical weld 10. Weld the titanium plate liner 120 and the steel substrate 110 at the connection between the annular cylinder 1 formed in step (2) and the annular cylinder 1 in step (1) to form a first annular weld 8 and a second annular weld. Weld the titanium strip 130 at the second vertical weld 10 and the first annular weld 8. The titanium strip 130 is usually selected with a width of 1-1.5 mm and a thickness of 5-10 cm. The size of a single titanium strip 130 is much smaller than the size of the first annular weld 8 and the second vertical weld 10.

[0075] Therefore, the welding of titanium strips 130 at the first annular weld 8 requires first welding individual titanium strips 130 together into an annular shape, and then annular welding is performed between the spliced ​​titanium strips 130 and the titanium plate liner 120; the welding of titanium strips 130 at the second vertical weld 10 requires first welding individual titanium strips 130 together into a long strip suitable for the second vertical weld 10, and then vertical welding is performed between the spliced ​​titanium strips 130 and the titanium plate liner 120.

[0076] (5) At the same time, the titanium strip 130 is subjected to light curing anti-corrosion treatment between the third platform 230 and the fourth platform 240, and the insulation layer 160 of the spliced ​​annular cylinder is treated on the second operating frame to form the titanium composite plate inner cylinder 14.

[0077] The photocuring anti-corrosion treatment includes the following steps: a) Substrate treatment: Sand the titanium strip and the area extending 200mm outward from both sides of the first annular weld and the second vertical weld using sandpaper; wipe the entire area clean with thinner or cleaner to remove residual developer and penetrant; b) Apply nano-titanium plate primer, covering the titanium strip and extending 180mm outward from both sides of the first annular weld and the second vertical weld; c) Cut photocurable nanosheets according to the actual size of the area after primer application and adhere the photocurable sheets to the primer; d) After the photocurable nanosheets are adhered, cure them with ultraviolet light.

[0078] The performance indicators of the photocurable nanosheets selected in this invention are as follows:

[0079]

[0080]

[0081] In anti-corrosion treatment, the titanium plate base coating 140 and the UV-cured nanosheet layer 150 can be applied using existing products. The UV-cured nanosheets can be cut to any size according to the anti-corrosion area, making the process convenient and fast. No welding, hot work, on-site material preparation, or curing are required. The material can be put into use immediately after application, significantly reducing construction time, difficulty, and labor costs. The UV-cured nanosheets also have a long service life, and almost no maintenance is required for the first few years of use. After 15 years, local aging and cracking may occur, which can be repaired locally with sheet patches. Curing takes 5-20 minutes, making single-point repair extremely fast and inexpensive. No welding or hot work is required; a "spider-man" can carry small pieces of material and use a sliding plate for repair.

[0082] (6) Repeat steps (1) to (5) to continuously increase the length of the titanium composite inner cylinder 14 until the required length is reached. Since the first operating frame 2 and the second operating frame 3 are multi-level platform designs, steps (1) to (5) can be performed simultaneously. That is, the welding of the first vertical weld of the annular cylinder 220 between the first layer platform 210 and the second layer platform 220, the welding of the longitudinal titanium strips 130 on the vertical connection seam between the titanium plate lining 120 and the titanium strips 130 and the titanium plate lining 120 between the second layer platform 220 and the third layer platform 230, and the light curing anti-corrosion treatment of the longitudinal titanium strips 130 on the surface of the third layer platform 230 and the fourth layer platform 240 are performed simultaneously.

[0083] III. Testing the UV-cured layer

[0084] After the UV-cured nanosheet layer 150 is completed, a visual inspection, thickness check, and spark test should be performed. The spark test includes the following: the lining should have been completed for at least 24 hours, the surface should be dry and clean, and the dew point temperature should be above 3°C. The testing speed should not exceed 5 cm / second. The spark leak detector voltage should conform to the following formula: when the coating thickness is ≤1mm, V=3294√Tc; when the coating thickness is >1mm, V=7843√Tc; where V: detection voltage (V); Tc: detection thickness (mm).

[0085] The performance comparison between the composite anti-corrosion structure of this invention and traditional titanium composite plates is as follows:

[0086]

[0087]

[0088] Therefore, the present invention adopts the above-mentioned anti-corrosion structure and construction process of titanium composite plate inner cylinder for desulfurization chimney, which enhances anti-corrosion performance, ensures the stability of the substrate, shortens the construction cycle, and reduces costs.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A corrosion-resistant structure for the inner cylinder of a desulfurization chimney made of titanium composite plate, characterized in that: The device includes a titanium composite plate inner cylinder, which is formed by splicing multiple annular cylinders from top to bottom. Each annular cylinder includes a steel base plate, and a titanium plate liner is provided on the inner side of the steel base plate. A titanium strip is provided on the inner side of the titanium plate liner. The surface of the titanium strip and the surface of the joint between the titanium strip and the titanium plate liner are sequentially covered with a titanium plate base coating and a photocurable nanosheet layer. The annular cylinder is disposed on the first operating frame and the second operating frame on one side of the first operating frame, and the first operating frame and the second operating frame are symmetrically distributed. The top of the first operating frame is provided with a lifting component, and a lifting cylinder is provided on the lifting component. The lifting cylinder is welded to the top of the titanium composite plate inner cylinder with an outwardly protruding outer edge. The lifting cylinder has a lifting point opening, and a lifting lug is provided in the lifting point opening and welded to the annular cylinder. The top of the lifting lug is connected to the lifting cylinder, and a sling is provided on the lifting lug for lifting the titanium composite plate inner cylinder. A crawling channel assembly is provided between the first operating frame and the second operating frame. An air guide pipe is provided on the crawling channel assembly. A counterflow hood is provided above the air guide pipe. A fan is provided below the air guide pipe. The fan is located below the first positioning assembly. The top of the air guide pipe is higher than the fourth platform. The first operating frame is provided with a first platform, a second platform, a third platform and a fourth platform in sequence from bottom to top; A first positioning component is provided on the first-layer platform, and a second positioning component is provided on the bottom surface of the fourth-layer platform; The first positioning component is ring-shaped and has a hydraulic jack at the bottom. It also has multiple positioning blocks. The two ends of the positioning blocks are respectively equipped with rubber pads and air rods. The multiple first positioning components are distributed at equal angles with the center of the first platform as the axis. The second slide rail on the second positioning component is connected to the lower surface of the fourth platform. A drive motor is provided below the second slide rail. A screw is provided at one end of the drive motor. A threaded second slider is sleeved on the screw. The upper end of the second slider is connected to the second slide rail. The top rod at its lower end is vertically connected to the top block. The top block is connected to the inner cylinder of the titanium composite plate. An annular airbag is provided below the third and fourth platforms. The annular airbag is connected to an integrated inflation and deflation pump. When the annular airbag is fully inflated, it fits against the inner wall of the titanium composite plate inner cylinder.

2. The anti-corrosion structure of the titanium composite plate inner cylinder of a desulfurization chimney according to claim 1, characterized in that: The vertical welding between the titanium plate liners forms a second vertical weld, and the circumferential welding between the titanium plate liners forms a first circumferential weld. The titanium strip is connected to the titanium plate liners at the first vertical weld and the first circumferential weld.

3. The anti-corrosion structure of the titanium composite plate inner cylinder of a desulfurization chimney according to claim 1, characterized in that: The lifting component is connected to the inner cylinder of the titanium composite plate.

4. The construction process of the anti-corrosion structure of the titanium composite plate inner cylinder of a desulfurization chimney according to any one of claims 1-3, characterized in that: Includes the following steps: (1) The steel base plate and the titanium plate lining are rolled into an arc plate with a corresponding curvature and then combined to form an arc titanium composite plate. The first operating frame and the second operating frame are respectively erected on the inner bottom surface of the outer casing of the chimney. (2) The arc-shaped titanium composite plate is transported to the first operating frame and its steel base plate is welded together to form a single-section annular cylinder. The connection of the steel base plates of each arc-shaped titanium composite plate forms the first vertical weld. (3) Lift the enclosed and welded single-section annular cylinder to a height of more than one section using the lifting assembly, and at the same time place the new arc-shaped titanium composite plate on the first platform again, repeating step (2). (4) The single-section annular cylinder formed in step (3) is brought into contact with the annular cylinder in step (2) by the first positioning component, and the two are aligned after being finely adjusted in the horizontal direction by the second positioning component; (5) Weld the connection of the titanium plate liner inside the annular cylinder formed in step (2) to form a second vertical weld. Weld the titanium plate liner and the steel base plate at the connection between the annular cylinder formed in step (3) and the annular cylinder in step (2) to form a first annular weld and a second annular weld. At the same time, splice and weld small pieces of titanium strips to make the first annular weld and the second vertical weld the same size. At the same time, weld the spliced ​​titanium strips at the second vertical weld and the first annular weld. (6) At the same time, the titanium strip is subjected to light curing anti-corrosion treatment, and the insulation layer of the spliced ​​annular cylinder is treated on the second operating frame to form a titanium composite plate inner cylinder. (7) Repeat steps (2) to (6).

5. The construction process of the anti-corrosion structure of the titanium composite plate inner cylinder of a desulfurization chimney according to claim 4, characterized in that: Steps (2) through (6) can be performed simultaneously.

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