A method for quick installation of desulfurization tower calcium-based fixed bed absorption bin modularization

Abstract

The application discloses a kind of based on desulfurization tower calcium-based fixed bed absorption bin modularization quick installation method, comprising the following steps: site is flattened.Absorption bin lower shell, cross beam are assembled respectively.Absorption bin lower shell, cross beam are combined and welded, and get combination body.Grid bucket is combined and welded with combination body, and absorption bin lower unit is obtained.Absorption bin lower unit is hoisted.Absorption bin lower unit is suspended on steel structure frame beam by cross beam.Absorption bin upper shell is assembled and welded.Absorption bin upper shell is hoisted.Absorption bin lower unit and absorption bin upper shell are combined and welded, and absorption bin is obtained.The method of the application reduces high-altitude operation, thereby reducing construction risk, so that construction is safer and more reliable, while improving construction efficiency, shortening construction period.

Description

Technical Field

[0001] This invention relates to the field of construction, and in particular to a modular rapid installation method for a calcium-based fixed-bed absorption chamber based on a desulfurization tower. Background Technology

[0002] The desulfurization process employs calcium-based fixed-bed convection desulfurization technology, using a modular installation method. Raw flue gas is diverted from the main flue gas duct, entering from the bottom and being delivered to the inlet of each fixed-bed absorption chamber via branch flues. After thorough contact with the flue gas from bottom to top, the treated clean flue gas exits from each fixed-bed absorption chamber and is discharged into the branch flues, then converges into the main clean flue gas duct, and finally exits through the chimney. The absorption chamber consists of a metal shell, silo, bed, gas-tight discharge valve, inlet, and outlet. As the flue gas flows upwards, SO2 and dust are continuously absorbed. After the same batch of absorbent enters the bed, the reaction saturation gradually decreases in the direction of flue gas flow. Through the downward movement of the material due to gravity, the saturated waste at the bottom is discharged first, and fresh desulfurizer is added to the calcium-based dry desulfurization unit through the feeding system. Waste desulfurizing agent is discharged from the unit through a rotary valve, unloaded onto a scraper conveyor, and then transported by the scraper conveyor to a waste desulfurizing agent silo for centralized processing. Finally, it is loaded onto trucks for off-site transportation via a rotary feeder in the waste desulfurizing agent silo.

[0003] The fixed-bed absorption chamber desulfurization unit, as a crucial component of the desulfurization system, is the most critical element. Taking the Maanshan Iron and Steel project as an example, the overall dimensions of the fixed-bed absorption chamber desulfurization unit are 6.4×6.4×6 (2m conical section). Each unit's conical section contains four smaller conical sections, forming a flue gas inlet cavity structure. The entire desulfurization unit consists of 16-32 units, arranged in 1-3 layers with different structures. The units are densely packed, making installation difficult. The complex flue gas ductwork design, coupled with the structural variations, necessitates high precision in construction while ensuring the functional bottom-in, top-out flue gas flow. Currently, the installation of fixed-bed absorption chambers involves significant high-altitude work, resulting in high construction risks, low efficiency, and long cycles. Summary of the Invention

[0004] This invention provides a modular rapid installation method for calcium-based fixed-bed absorption chambers in desulfurization towers, which can shorten the construction cycle.

[0005] This invention provides a modular rapid installation method for a calcium-based fixed-bed absorption chamber in a desulfurization tower, comprising the following steps: Leveling the site; assembling the lower shell and cross beams of the absorption chamber; welding the lower shell and cross beams together to obtain a composite assembly; welding the grid bucket to the composite assembly to obtain the lower unit of the absorption chamber; hoisting the lower unit of the absorption chamber; suspending the lower unit of the absorption chamber on the steel frame beams using the cross beams; assembling and welding the upper shell of the absorption chamber; hoisting the upper shell of the absorption chamber; and welding the lower unit of the absorption chamber to the upper shell of the absorption chamber to obtain the absorption chamber.

[0006] In some embodiments, during the assembly of the cross beams, after the first cross beam is assembled and welded, it is used as a jig for assembling and welding the other cross beams.

[0007] In some embodiments, when other cross beams are assembled and welded on the jig, each cross beam is stacked on top of the jig after it has been assembled and welded.

[0008] In some of these embodiments, up to four cross beams are assembled and welded together on the jig.

[0009] In some embodiments, during the assembly of the cross beams, the welding quality of the cross beams is monitored in a timely manner, and the next construction process is carried out only after the quality is qualified.

[0010] In some embodiments, during the assembly welding of the lower shell of the absorption chamber and the cross beam, the horizontality and verticality of the cross beam are strictly controlled.

[0011] In some embodiments, during the process of assembling and welding the grid buckets to the assembly, four grid buckets are placed sequentially into the four spaces of the cross beam, and the gaps between the grid buckets and the cross beam are welded together with flat steel.

[0012] In some embodiments, during the process of suspending the lower unit of the absorption chamber on the steel frame beam by means of a cross beam, the movable base is first welded to the steel frame beam, then polytetrafluoroethylene (PTFE) sheets are laid on the movable base, and then the cross beam is attached to the movable base.

[0013] In some embodiments, the upper shell of the absorption chamber is assembled and welded simultaneously with the hoisting of the lower unit of the absorption chamber.

[0014] In some embodiments, during the process of assembling and welding the lower unit of the absorption chamber to the upper shell of the absorption chamber, the lower unit of the absorption chamber and the upper shell of the absorption chamber are first assembled and fixed together, and then the lower unit of the absorption chamber and the upper shell of the absorption chamber are welded together.

[0015] According to an embodiment of the present invention, a modular rapid installation method for a calcium-based fixed-bed absorption chamber in a desulfurization tower is provided, comprising the following steps: leveling the site; assembling the lower shell and cross beams of the absorption chamber; welding the lower shell and cross beams together to obtain a composite body; welding the grid bucket to the composite body to obtain the lower unit of the absorption chamber; hoisting the lower unit of the absorption chamber; suspending the lower unit of the absorption chamber on the steel frame beams using the cross beams; assembling and welding the upper shell of the absorption chamber; hoisting the upper shell of the absorption chamber; and welding the lower unit of the absorption chamber to the upper shell of the absorption chamber to obtain the absorption chamber. This method reduces high-altitude operations, thereby lowering construction risks, making construction safer and more reliable, while also improving construction efficiency and shortening the construction cycle. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the lower unit of the absorption chamber in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the cross-beam stacking structure in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the grid bucket structure in an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] See Figure 1-3 The present invention provides a modular rapid installation method for a calcium-based fixed-bed absorption chamber based on a desulfurization tower, comprising the following steps:

[0022] Step 1: Based on the on-site construction space conditions and construction time, divide the area into the lower unit of the absorption chamber, the upper shell assembly area of ​​the absorption chamber, the assembly area, and the hoisting area of ​​the absorption chamber.

[0023] Step 2: Level the site according to the designated areas.

[0024] In the above steps, the layout of the assembly site for the lower shell 1, cross beam 2, and upper shell of the absorption chamber, as well as the material transportation channels, should be planned on the plane. In terms of space, the overall hoisting of the lower unit and upper shell of the absorption chamber, the crane's occupancy, turning radius, and displacement deviation after hoisting should be fully considered.

[0025] Step 3: After the first batch of absorption chamber shell pieces and support beam components arrive on site, the lower shell 1 and cross beam 2 of the absorption chamber will be assembled respectively.

[0026] In the above steps, the lower shell 1 of the absorption chamber is obtained by assembling the single outer shell of the absorption chamber. The cross beam 2 is obtained by assembling the support beam components.

[0027] During the assembly of cross beams 2, after the first cross beam 2 is assembled and welded, it serves as the jig for assembling and welding other cross beams 2. When assembling and welding other cross beams 2 on the jig, after each cross beam 2 is assembled and welded, it is stacked on top of the jig. This arrangement reduces the space required. A maximum of four cross beams 2 can be assembled and welded on the jig.

[0028] In addition, during the assembly of cross beam 2, the welding quality of cross beam 2 is monitored in a timely manner, and the next construction process is carried out after it passes the inspection.

[0029] Step 4: After the lower shell 1 and cross beam 2 of the absorption chamber are assembled, the lower shell 1 and cross beam 2 of the absorption chamber are combined and welded to obtain the combined body.

[0030] In the above steps, during the assembly welding of the lower shell 1 of the absorption chamber and the cross beam 2, the horizontality and center verticality of the cross beam 2 are strictly controlled.

[0031] Step 5: After the grid bucket 3 is processed by the processing plant and delivered to the site as a whole, the grid bucket 3 is assembled and welded with the assembly to obtain the lower unit of the absorption chamber.

[0032] In the above steps, four grid buckets 3 are placed into the four spaces of the cross beam 2 in sequence, and the gaps between the grid buckets 3 and the cross beam 2 are welded together with flat steel.

[0033] Step 6: After completing the welding of the grid bucket 3 with the assembly, the lower unit of the absorption chamber is hoisted.

[0034] In the above steps, a 300-ton crawler crane was used for hoisting, and the overall weight of the lower unit of the absorption chamber was 18.2 tons.

[0035] Step 7: Suspend the lower unit of the absorption chamber on the steel frame beam by relying on the cross beam 2.

[0036] In the above steps, the part where the cross beam 2 is attached to the steel frame beam adopts the form of a movable base. Specifically, the movable base is first welded to the steel frame beam, then polytetrafluoroethylene board is laid on the movable base, and then the cross beam 2 is attached to the movable base.

[0037] Step 8: Assemble and weld the upper shell of the absorption chamber.

[0038] The above steps are carried out in the available space on site.

[0039] In addition, while hoisting the lower unit of the absorption chamber, the upper shell of the absorption chamber was assembled and welded.

[0040] Step 9: Hoist the upper shell of the absorption chamber.

[0041] In the above steps, a 300-ton crawler crane was used for hoisting.

[0042] Step 10: Weld the lower unit of the absorption chamber to the upper shell of the absorption chamber to obtain the absorption chamber.

[0043] In the above steps, the lower unit of the absorption chamber is first assembled and fixed with the upper shell of the absorption chamber, and then the lower unit of the absorption chamber is welded to the upper shell of the absorption chamber.

[0044] It should be noted that the desulfurization tower is a steel structure with a total of 16 absorption chambers, 8 on each of the upper and lower levels. Each absorption chamber contains 4 cone-shaped adsorbent fixed beds, for a total of 64 chambers.

[0045] In summary, the method of this application makes full use of the relationship between space and process time, reduces the adverse effects of high-altitude construction, greatly reduces the safety risks of high-altitude assembly, and greatly saves time. At the same time, the biggest advantage of this method is the modular assembly and hoisting of the absorption silo, which reduces cross-operations and maximizes the utilization rate of machinery and materials. It effectively reduces the situation where the project cannot make reasonable use of the schedule and personnel due to site problems and schedule problems. This method has higher work efficiency, more reasonable use of space and time, and greatly saves time and reduces unsafe factors.

[0046] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they 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, the terms describing positional relationships in the drawings are for illustrative purposes only and should not be construed as limiting this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0047] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A modular rapid installation method for a calcium-based fixed-bed absorption chamber based on a desulfurization tower, characterized in that, Includes the following steps: Level the site; The lower shell of the absorption chamber and the cross beam were assembled separately. The lower shell of the absorption chamber and the cross beam are combined and welded together to obtain the assembled body; The grid bucket is welded together with the assembly to obtain the lower unit of the absorption chamber; The lower unit of the absorption chamber was hoisted. The lower unit of the absorption chamber is suspended on the steel frame beam by a cross beam; The upper shell of the absorption chamber is assembled and welded. Hoisting of the upper shell of the absorption chamber; The lower unit of the absorption chamber is welded together with the upper shell of the absorption chamber to obtain the absorption chamber; During the assembly of the cross beams, after the first cross beam is assembled and welded, it is used as a jig for assembling and welding the other cross beams.

2. The modular rapid installation method for a calcium-based fixed-bed absorption chamber based on a desulfurization tower as described in claim 1, characterized in that, When assembling and welding other cross beams on the jig, after each cross beam is assembled and welded, it is stacked on top of the jig.

3. The modular rapid installation method for a calcium-based fixed-bed absorption chamber based on a desulfurization tower as described in claim 2, characterized in that, At most, four cross beams can be assembled and welded on the jig.

4. The modular rapid installation method for a calcium-based fixed-bed absorption chamber based on a desulfurization tower as described in claim 1, characterized in that, During the assembly of the cross beams, the welding quality of the cross beams is monitored in a timely manner, and the next construction process is carried out only after the quality is qualified.

5. The modular rapid installation method for a calcium-based fixed-bed absorption chamber based on a desulfurization tower as described in claim 1, characterized in that, During the assembly and welding of the lower shell of the absorption chamber and the cross beam, the horizontality and verticality of the cross beam must be strictly controlled.

6. The modular rapid installation method for a calcium-based fixed-bed absorption chamber based on a desulfurization tower as described in claim 1, characterized in that, During the assembly and welding process of the grid buckets and the composite body, the four grid buckets are placed into the four spaces of the cross beam in sequence, and the gaps between the grid buckets and the cross beam are welded together with flat steel.

7. The modular rapid installation method for a calcium-based fixed-bed absorption chamber based on a desulfurization tower as described in claim 1, characterized in that, In the process of suspending the lower unit of the absorption chamber on the steel frame beam by means of the cross beam, the movable base is first welded to the steel frame beam, then polytetrafluoroethylene plate is laid on the movable base, and then the cross beam is attached to the movable base.

8. The modular rapid installation method for a calcium-based fixed-bed absorption chamber based on a desulfurization tower as described in claim 1, characterized in that, While the lower unit of the absorption chamber was being hoisted, the upper shell of the absorption chamber was being assembled and welded.

9. The modular rapid installation method for a calcium-based fixed-bed absorption chamber based on a desulfurization tower as described in claim 1, characterized in that, During the process of assembling and welding the lower unit of the absorption chamber with the upper shell of the absorption chamber, the lower unit of the absorption chamber is first assembled and fixed with the upper shell of the absorption chamber, and then the lower unit of the absorption chamber is welded with the upper shell of the absorption chamber.

Images