Integrated demister supporting device and variable-diameter absorption tower

Abstract

The invention relates to the technical field of flue gas desulfurization, and discloses an integrated demister supporting device and a variable-diameter absorption tower, the integrated demister supporting device comprises a demister supporting base, a demister supporting column and a demister supporting beam used for supporting a demister, the bottom of the demister supporting column is connected with the demister supporting base, and the demister supporting beam is connected with the demister supporting base. And the demister supporting column is connected with the demister supporting beam. The problems that in the prior art, a supporting structure is complex, and the space utilization rate is low are solved.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas desulfurization, and in particular to an integrated demister supporting device and a variable diameter absorption tower. Background Art

[0002] In seawater desulfurization technology, the absorption tower is the core equipment. At present, the industry mainly uses two types of towers, spray towers and packed towers, to achieve gas-liquid mass transfer. In order to meet the high emission and ultra-low emission limit requirements of power plants, patent CN220737014U proposes a high-efficiency flue gas absorption tower that combines the advantages of spray and packed towers, arranges the packing layer, porous plate, and spray layer from bottom to top, strengthens the gas-liquid contact, and achieves dual optimization of desulfurization efficiency and energy consumption, which has good application prospects.

[0003] However, in the existing seawater desulfurization technology, the spray layer is usually made of FRP, the support beam is made of carbon steel lined with glass flakes, and the outside of the support beam of some projects is also covered with PP plates or alloy materials; the demister is equipped with a separate support beam, which is usually also made of carbon steel lined with glass flakes. The number and types of supporting components in the absorption tower are various, the support system is highly complex, and the overall structure lacks compactness, resulting in a large workload during installation and maintenance. At the same time, the complex support structure has potential failure points, and the overall operating stability of the desulfurization device needs to be improved urgently. In addition, in engineering applications, if the packed tower adopts a design in which the demister area and the absorption tower body have the same diameter, since the spray and packing areas will choose a lower flow rate, the flue gas will flow too slowly in the demister area, and the demisting effect will be poor. Additional materials need to be added to close some areas to speed up the flue gas flow rate through the demister area to ensure the demisting effect. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides an integrated demister support device and a variable diameter absorption tower, which solve the problems of complex support structure and low space utilization in the prior art.

[0005] The technical solution adopted by the present invention to solve the above problems is:

[0006] An integrated demister support device comprises a demister support base, a demister support column, and a demister support beam for supporting the demister, wherein the bottom of the demister support column is connected to the demister support base, and the demister support column is connected to the demister support beam.

[0007] As a preferred technical solution, the diameter of the demister support base is 100-400 mm.

[0008] As a preferred technical solution, the height of the demister support column is 1200-3000 mm.

[0009] As a preferred technical solution, the diameter of the demister support column is 100-400 mm.

[0010] A variable diameter absorption tower comprises an absorption tower shell, spray layers arranged inside the absorption tower shell and connected in sequence from bottom to top, an integrated demister support device, and a demister. The absorption tower shell comprises an absorption tower variable diameter section arranged between the spray layers and the demister, the diameter of which gradually decreases from bottom to top.

[0011] As a preferred technical solution, the angle between the outer surface of the diameter-changing section of the absorption tower and the vertical line is ≤40°.

[0012] As a preferred technical solution, the spray layer includes one or more spray mother pipes, the bottom of the demister support base is connected to the top of the spray mother pipe, and a spray hole is opened at the bottom of the spray mother pipe, and the aperture of the spray hole is 30-100mm.

[0013] As a preferred technical solution, the spray layer includes one or more spray branch pipes, which are arranged on both sides of the spray main pipe and vertically connected to the spray main pipe.

[0014] As a preferred technical solution, there are multiple demister support bases connected to the top of each spray mother pipe, and the spacing between adjacent demister support bases on the top of the same spray mother pipe is 1500-4500mm.

[0015] As a preferred technical solution, a through hole is opened on the absorption tower shell, the spray mother pipe can be inserted into the through hole and penetrate the absorption tower shell, and the spray mother pipe is welded to the absorption tower shell.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention adopts an integrated support structure for the demister and the spray layer to achieve synchronous support and fixation of the two, simplifying the complexity of the support system, reducing the burden of installation and maintenance operations, and enhancing the overall stability and operational reliability of the absorption tower;

[0018] (2) The uniform openings and arrangement of nozzles at the bottom of the equal-diameter mother pipe of the present invention promote more uniform distribution of the spray liquid, enhance the spraying effect, and improve the desulfurization efficiency;

[0019] (3) The absorption tower of the present invention is provided with a variable diameter section between the spray layer and the demister to optimize the gas velocity distribution in the tower, reduce flue gas vortex and short circuit, improve the demisting efficiency, reduce operating energy consumption, and at the same time optimize the equipment space layout, improve the equipment compactness, and reduce investment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is one of the application schematic diagrams of an integrated demister support device according to the present invention;

[0021] Figure 2 for Figure 1 Left view of

[0022] Figure 3 This is a second application schematic diagram of an integrated demister support device according to the present invention;

[0023] Figure 4 for Figure 3 Left view of

[0024] Figure 5 This is a schematic structural diagram of a variable diameter absorption tower according to the present invention;

[0025] Figure 6 It is a top view of the spray layer;

[0026] Figure 7 Schematic diagram of the spray branch pipe support structure connected to the inner wall of the absorption tower shell.

[0027] Marks and their corresponding names in the accompanying drawings: 1-absorption tower flue gas inlet, 21-packing layer, 221-spray main pipe, 222-spray branch pipe, 223-spray hole, 224-nozzle, 225-spray branch pipe supporting structure, 231-demister supporting base, 232-demister supporting column, 233-demister supporting beam, 24-demister, 3-absorption tower shell, 31-through hole, 4-absorption tower reducing section, 5-absorption tower flue gas outlet. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0029] Example 1

[0030] like Figures 1 to 7 As shown, the first purpose of the present invention is to provide an integrated support device for a demister and a spray layer. The spray layer adopts a self-supporting equal-diameter spray mother pipe, and adopts an integrated support structure for the demister and the spray layer. The demister is synchronously supported on the spray mother pipe through a support device, aiming to solve the problems of a large number and high complexity of the supporting structures of the tower internals, and low efficiency of space utilization in the tower, which exist in the existing absorption tower technology; the second purpose of the present invention is to provide a variable diameter absorption tower adopting the above-mentioned integrated support device, aiming to optimize the space utilization in the absorption tower, improve the system stability, and solve the problems of uneven flue gas flow velocity distribution in the existing packed tower technology.

[0031] An integrated demister support device is composed of a demister support base 231 made of carbon steel, a demister support column 232 and a demister support beam 233 connected from bottom to top, wherein the top of the demister support base 231 is connected to the bottom of the demister support column 232, and the top of the demister support column 232 is connected to the demister support beam 233 (two typical connection methods are as follows Figures 1 to 4 As shown: Figure 1 In the embodiment, the top of the demister support column 232 is connected to the bottom of the demister support beam 233; Figure 4 The side surface of the demister support column 232 (preferably the side surface close to the top) is connected to the side end surface of the demister support beam 233), the demister support base 231 has a side length (diameter) of 100-400mm, the demister support column 232 has a height of 1200-3000mm, and a side length (diameter) of 100-400mm, and the outer walls of the demister support base 231, the demister support column 232 and the demister support beam 233 are coated with glass flakes for corrosion protection. The bottom of the demister support base 231 is connected to the top of the absorption tower spray mother pipe 221 of equal diameter, and the distance between adjacent demister support bases 231 on the same spray mother pipe 221 is 1500-4500mm, and its specific distribution can be appropriately adjusted according to the position and number of the demister 24. The equal-diameter absorber spray mother pipe 221 is made of carbon steel, and its inner and outer walls are coated with silicon carbide or rubber lining; the spray mother pipe 221 is fixed in a self-supporting manner, that is, the spray mother pipe 221 and the absorber shell 3 are connected by "penetrating welding"; the "penetrating welding" is specifically as follows: a hole (through hole 31) is opened at a predetermined position of the spray mother pipe 221 on the absorber shell 3, the spray mother pipe 221 is inserted into the through hole 31 and penetrates the absorber shell 3, and the spray mother pipe 221 and the absorber shell 3 are connected by welding.

[0032] The spray layer is composed of the above-mentioned uniform diameter spray main pipe 221 and a plurality of spray branch pipes 222. The uniform diameter spray main pipe 221 has holes evenly opened at the bottom (spray holes 223, with a hole diameter of 30-100 mm) and is provided with nozzles 224. A plurality of spray branch pipes 222 are evenly distributed on both sides of the spray main pipe 221 and are vertically connected to the spray main pipe 221. The spray branch pipes 222 are made of FRP material, and the ends of the spray branch pipes 222 are supported by spray branch pipe support structures 225 evenly distributed along the inner wall of the absorption tower shell 3 ( Figure 7 The spray main pipe 221 and the spray branch pipe 222 are connected by flanges, and the spray branch pipe 222 and the nozzle are bonded.

[0033] A variable diameter absorption tower adopts the above-mentioned integrated demister support device, comprising an absorption tower shell 3, a packing layer 21, a spray layer, an integrated demister support device, a demister 24, and an absorption tower flue gas inlet 1 and an absorption tower flue gas outlet 5 arranged on the absorption tower shell 3. Figure 5 As shown, there is an absorber tower reducing section 4 between the spray layer and the demister 24, the diameter of which gradually decreases from bottom to top, and the semi-vertex angle a of the reducing section (the angle between the outer surface of the absorber tower reducing section 4 and the vertical line) should not be greater than 40°.

[0034] The distance between the packing layer 21 and the upper edge of the absorption tower flue gas inlet 1 is 1000-2500mm, the packing layer 21 is formed by regular or irregular packing, the height of the packing layer 21 is 2000-6000mm, and the upper edge of the packing layer 21 is 1000-3000mm away from the spray layer. The demister 24 adopts a first-level ridge demister, and the distance between the spray layer and the demister 24 is 1200-3000mm.

[0035] Example 2

[0036] like Figures 1 to 7 As shown, as a further optimization of Example 1, based on Example 1, this embodiment also includes the following technical features:

[0037] In order to solve the problems of complex supporting structure of absorption tower internals, low space utilization, large installation and maintenance workload, uneven airflow distribution, etc. in the existing seawater desulfurization technology, the preferred embodiment of the present invention is an integrated demister support device, including a carbon steel demister support base 231, a demister support column 232 and a demister support beam 233 connected in sequence from bottom to top, the spray layer adopts a self-supporting equal-diameter carbon steel spray mother pipe 221, and the demister 24 is synchronously supported on the spray mother pipe 221 through the integrated demister support device. The bottom of the spray mother pipe 221 is evenly opened and a nozzle is arranged; a variable diameter absorption tower, adopting the above-mentioned integrated demister support device and spray layer arrangement, and an absorption tower variable diameter section 4 with a diameter gradually decreasing from bottom to top is provided between the spray layer and the demister 24.

[0038] The flue gas enters the tower from the absorber flue gas inlet 1 of the absorber, and contacts the filler layer 21 uniformly distributed with seawater and the seawater sprayed by the spray layer in a countercurrent manner from bottom to top. The clean flue gas desulfurized by two stages of seawater flows through the absorber variable diameter section 4 and enters the demister 24, and flows out from the absorber flue gas outlet 5 at the top of the tower after removing the carried droplets. In the absorber section with a smaller diameter, the flue gas velocity distribution is optimized, the gas velocity is increased, and the gas-liquid separation effect in the demister 24 is improved.

[0039] Taking a coal-fired unit seawater desulfurization project as an example, the technology of the present invention is adopted. The diameter of the absorption tower is 11000mm. The tower is filled with PP snowflake-shaped random packing. The packing height is 4000mm. The distance between the packing layer and the upper edge of the flue gas inlet of the absorption tower and the spray layer is 1500mm and 2400mm respectively. The spray layer uses two equal-diameter carbon steel spray mother pipes with a diameter of 1000mm (the spray mother pipe is lined with silicon carbide or rubber before leaving the factory). The bottom of the spray mother pipe is evenly opened with holes (aperture 80mm) and nozzles are installed. The nozzles are spaced 2m apart. Several FRP spray branch pipes with a diameter of 100-400mm are evenly distributed on both sides of the spray mother pipe and are vertically connected to the spray mother pipe through flanges. The spray mother pipe is fixed to the absorption tower shell in a self-supporting manner of "penetrating welding connection". The spray liquid outlet pipelines at both ends of the spray branch pipe are supported by a spray branch pipe support structure evenly distributed along the inner wall of the absorption tower shell ( Figure 7 A first-level PP ridge-type demister is used, with a distance of 2200mm between the spray layer and the demister. Two carbon steel demister support bases (length × width = 400mm × 300mm) with a distance of 3500mm and two demister support columns (length × width = 200mm × 200mm) with a height of 2200mm are connected above the two spray main pipes. The demister support base, demister support column, and demister support beam are welded and connected in sequence from bottom to top. The outer walls of the demister support base, demister support column, and demister support beam are coated with glass flakes on site for corrosion protection. Seawater is sprayed into the absorption tower through the spray layer for desulfurization. The seawater desulfurization efficiency is 99.3%, and the net flue gas SO 2 The emission concentration is lower than the ultra-low emission limit of 35mg / Nm 3 The droplet content of the flue gas at the demister outlet is less than 75mg / Nm 3 (Dry basis), the pressure drop through the demister system is less than 50 Pa. In summary, the seawater absorption tower using the technology of the present invention has a higher desulfurization efficiency, and the integrated demister support and variable diameter design make the seawater absorption tower more economical and reliable.

[0040] As a preferred example of the present invention, it may also have the following additional technical features: to facilitate on-site installation of the project, the demister support base and the spray main pipe are pre-welded and connected in the factory and then lined with silicon carbide or rubber for corrosion protection; the demister support column and the demister support base, as well as the demister support column and the demister support beam are connected and fixed by welding on site and then coated with glass flakes for corrosion protection.

[0041] It should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and there are many variations, such as adjusting the number and position of the demister support columns, adopting different tower internal connection and fixing methods, etc. According to the technical essence of the present invention, within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement of the above examples still fall within the protection scope of the technical solution of the present invention.

[0042] As described above, the present invention can be preferably implemented.

[0043] All features disclosed in all embodiments in this specification, or steps in all methods or processes implicitly disclosed, except for mutually exclusive features and / or steps, can be combined and / or expanded or replaced in any manner.

Claims

1. An integrated demister support device, characterized in that: The demister comprises a demister support base (231), a demister support column (232), and a demister support beam (233) for supporting the demister, wherein the bottom of the demister support column (232) is connected to the demister support base (231), and the demister support column (232) is connected to the demister support beam (233).

2. The integrated demister support device according to claim 1, characterized in that: The diameter of the demister support base (231) is 100-400 mm.

3. The integrated demister support device according to claim 1, characterized in that: The height of the demister support column (232) is 1200-3000 mm.

4. An integrated demister support device according to any one of claims 1 to 3, characterized in that: The diameter of the demister support column (232) is 100-400 mm.

5. A variable diameter absorption tower, characterized in that: The invention comprises an absorption tower shell (3), spray layers arranged inside the absorption tower shell (3) and connected in sequence from bottom to top, an integrated demister support device according to any one of claims 1 to 4, and a demister (24), wherein the absorption tower shell (3) comprises an absorption tower reducing section (4) arranged between the spray layers and the demister (24), the diameter of which gradually decreases from bottom to top.

6. A variable diameter absorption tower according to claim 5, characterized in that: The angle between the outer surface of the absorber diameter reducing section (4) and the vertical line is ≤40°.

7. A variable diameter absorption tower according to claim 5 or 6, characterized in that: The spray layer comprises one or more spray main pipes (221), the bottom of the demister support base (231) is connected to the top of the spray main pipe (221), the bottom of the spray main pipe (221) is provided with a spray hole (223), and the diameter of the spray hole (223) is 30-100 mm.

8. A variable diameter absorption tower according to claim 7, characterized in that: The spray layer comprises one or more spray branch pipes (222), and the spray branch pipes (222) are arranged on both sides of the spray main pipe (221) and are vertically connected to the spray main pipe (221).

9. The variable diameter absorption tower according to claim 7, characterized in that: The number of demister support bases (231) connected to the top of each spray mother pipe (221) is multiple, and the spacing between adjacent demister support bases (231) on the top of the same spray mother pipe (221) is 1500-4500 mm.

10. The variable diameter absorption tower according to claim 7, characterized in that: The absorption tower shell (3) is provided with a through hole (31), the spray mother pipe (221) can be inserted into the through hole (31) and penetrate the absorption tower shell (3), and the spray mother pipe (221) is welded to the absorption tower shell (3).

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