Ammonia desulfurization oxidation tower

Abstract

The utility model relates to an ammonia-process desulfurization oxidation tower, which is characterized in that the ammonia-process desulfurization oxidation tower (100) comprises at least one plate-shaped oxidation gas distribution device (4), and the oxidation gas distribution device (4) is provided with a plurality of independent plate modules. At least one of the sheet metal modules is designed as an air distribution module (8) having air holes (9). According to the utility model, the oxidation gas distribution device can be spliced by utilizing a plurality of independent plate modules according to the requirements, so that the manufacturing of the oxidation gas distribution device can be simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of ammonia desulfurization oxidation tower. BACKGROUND

[0002] Ammonia desulfurization is a commonly used desulfurization technology. In ammonia desulfurization, ammonia is used as an absorbent to absorb sulfur dioxide in waste gas, thereby generating ammonium sulfite solution. However, ammonium sulfite in ammonium sulfite solution is easily decomposed and unstable, and thus needs to be oxidized into ammonium sulfate. One of the key steps of ammonia desulfurization is to oxidize ammonium sulfite in ammonium sulfite solution into ammonium sulfate. If the oxidation is not complete, it will affect the recovery rate of sulfur dioxide in waste gas. In addition, aerosol is easily generated due to the easy decomposition of ammonium sulfite.

[0003] The oxidation process of ammonium sulfite involves the process of combining ammonium sulfite with oxygen to generate ammonium sulfate. Ammonium sulfite in ammonium sulfite solution with low concentration is easier to oxidize, with a higher oxidation rate, but in solution with high concentration of ammonium sulfite or ammonium sulfate, the oxidation rate of ammonium sulfite is lower. In addition, the oxidation rate is affected by many factors such as slurry temperature, gas-liquid contact area, pH value, salt concentration, oxygen dissolution rate, etc.

[0004] The bottom of the conventional oxidation equipment is a microporous aeration device with holes punched in the pipeline, and multiple layers of sieve plates are arranged above the microporous aeration device, which are integrally formed. When the oxidation gas rises from the microporous aeration device, the smaller bubbles in the solution will merge and the bubbles will become larger and larger. The specific surface area of larger bubbles is small, resulting in a lower dissolved oxygen transfer rate and poor gas-liquid mass transfer effect. Therefore, an integral sieve plate is arranged at the upper part of the oxidation equipment for gas distribution to disperse larger bubbles into smaller bubbles.

[0005] CN203599062U discloses a desulfurization sieve plate. The desulfurization sieve plate includes a sieve plate body, and circular sieve holes are provided on the sieve plate body. A flange is connected below each sieve hole, and the flange and the sieve hole are integrally formed. A reinforcing ring is also provided below each sieve hole, and the lower part of the flange is curved outward in an arc shape and wrapped on the outside of the reinforcing ring. However, this sieve plate is not used for oxidizing ammonium sulfite, and the overall structure assembly of the sieve plate is not considered.

[0006] CN201940170U discloses a flue gas desulfurization device with a sieve plate. The flue gas desulfurization device comprises an absorption tower, a limestone slurry tank communicated with the absorption tower, and a limestone slurry circulating system. The lower part of the absorption tower is communicated with an air inlet pipeline, and the upper part is communicated with an air outlet pipeline. The limestone slurry circulating system comprises a circulating pump communicated with the limestone slurry tank and a nozzle in the absorption tower communicated with the circulating pump. A sieve plate with sieve holes is arranged in the middle of the absorption tower. However, the sieve plate is used for uniform distribution of flue gas in the absorption tower.

[0007] CN201231129Y discloses a novel ammonia desulfurization sub-salt oxidation tower. The ammonia desulfurization sub-salt oxidation tower comprises a shell, a sieve plate, a microporous aeration device, and an oxidation temperature adjusting pipe heated directly by steam, which is arranged between the microporous aeration device and the single-layer sieve plate. The microporous aeration device is made of PP and HPDE high molecular materials by laser punching method. The sieve plate arranged above the microporous aeration device is a single-layer sieve plate which is integrally formed. Utility model content

[0008] The utility model discloses a kind of ammonia desulfurization oxidation towers, which can at least solve one of the above-mentioned problems.

[0009] To achieve the above object, the utility model provides an ammonia desulfurization oxidation tower, characterized in that the ammonia desulfurization oxidation tower comprises at least one plate-shaped oxidation gas distribution device, the oxidation gas distribution device has a plurality of plate modules independent of each other, and at least one of the plate modules is an air distribution module with air holes.

[0010] In the ammonia desulfurization oxidation tower according to the utility model, the oxidation gas distribution device can be spliced using a plurality of plate modules independent of each other as needed, so that the manufacturing of the oxidation gas distribution device can be simplified.

[0011] Advantageously, the oxidation gas distribution device is arranged in an internal space delimited by the tower wall transversely to the vertical axis of the tower wall, wherein the oxidation gas distribution device has a plurality of beams arranged transversely to the tower wall, the beams are fixed to the tower wall, a plurality of voids independent of each other are divided in the cross section of the internal space of the tower wall by the beams, and the plate modules cover the voids respectively.

[0012] Advantageously, a plurality of air distribution modules are provided, at least two of the plurality of air distribution modules have the same geometric structure and / or the same air hole distribution and / or the same air hole size.

[0013] Advantageously, the beams are arranged transversely to each other such that the interspace covered by the air distribution module is at least delimited by beams surrounding the interspace. Here, "beams arranged transversely to each other" means that at least one portion of a beam is arranged non-parallel to another portion of a beam or in other words is arranged at a relative angle of more than 0° to each other or in other words they are arranged crossing each other.

[0014] Advantageously, the beams comprise a first beam and a second beam arranged perpendicular to the first beam, the rectangular interspace covered by the air distribution module being surrounded by the first beam and the second beam.

[0015] Advantageously, the beams comprise a first beam, a second beam arranged perpendicular to the first beam and a third beam arranged oblique to the first beam and the second beam, the triangular interspace covered by the air distribution module being surrounded by at least two of the first beam, the second beam and the third beam.

[0016] Advantageously, at least one of the panel modules is configured as a solid module without air holes.

[0017] Advantageously, the panel modules are at least partially butt-jointed to the beams.

[0018] Advantageously, support columns are provided which support the beams upwardly transversely to the beams.

[0019] Advantageously, the ammonia desulphurization oxidation tower has a plurality of oxidation gas distribution devices arranged in succession in its vertical direction. BRIEF DESCRIPTION OF DRAWINGS

[0020] The application will be explained in more detail below by means of embodiments with reference to the drawings, but the application is not restricted to the embodiments described in the drawings and explained in more detail below. The drawings are as follows:

[0021] Figure 1 A partial view of an ammonia desulphurization oxidation tower is shown schematically in a side sectional view;

[0022] Figure 2 A top view is shown schematically of a partial view of an air distribution module and beams of an oxidation gas distribution device according to a first embodiment of the application;

[0023] Figure 3 A top view is shown schematically of a partial view of an air distribution module and beams of an oxidation gas distribution device according to a second embodiment of the application. DETAILED DESCRIPTION

[0024] Illustrative embodiments of the ammonia desulphurization oxidation column of the present application are described below. In this description, for the purpose of explanation, numerous specific details of systems, structures and devices are set forth in order to provide a thorough understanding of the present application. It should be understood, however, that the present application can be practiced without all of these specific details, and that the specific details are merely provided for the purpose of explanation and not of limitation. Only the claims are limiting. In other instances, well-known structures and devices are shown in block diagram form in order to avoid unnecessary obscurity. It should be understood that many of the specific details provided throughout this description are subject to change. For example, specific materials and processes are described to provide a thorough understanding of the embodiments, but the present application can be practiced without resorting to the specific materials and / or processes. In addition, the present application can take many different forms than the embodiments explicitly described and illustrated herein. Accordingly, the specific details set forth are merely examples of the present application and are not intended to limit the scope of the present application.

[0025] The terms and phrases used herein should be understood as having the same meaning as those of ordinary skill in the art to which the present application pertains. The terms and phrases used herein are not intended to limit the present application, unless otherwise expressly so limited. The description and drawings are to be regarded as illustrative in nature and definitions should be understood to control over the description of the application.

[0026] Unless the content requires otherwise, throughout the description, the word "comprise" and variations of the word, such as "comprising" and "comprises," will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers. In addition, the words "a" and "an" as used herein indicate "at least one" of the referenced material.

[0027] Figure 1 A part of the ammonia desulphurization oxidation column 100 according to the first embodiment of the present application is schematically shown in a cross-sectional view.

[0028] Referring to Figure 1 , the ammonia desulphurization oxidation column 100 comprises a vertically extending hollow cylindrical tower wall 1 and an interior space 2 delimited by the tower wall 1. The cross-sectional diameter of the interior space 2 typically has a dimension of 3 m or more. The ammonia desulphurization oxidation column 100 is used for oxidizing ammonium sulphite in a solution containing ammonium sulphite introduced into the interior space 2 to ammonium sulphate by means of an oxidizing gas, for example air containing oxygen. In the interior space 2 of the ammonia desulphurization oxidation column 100, the ammonia desulphurization oxidation column 100 can have a tubular microporous aeration device 3 with a microporous structure and a plate-like oxidizing gas distribution device 4. The oxidizing gas distribution device 4 is arranged above the microporous aeration device 3 along the vertical direction of the ammonia desulphurization oxidation column 100 and both are arranged in the solution in the interior space 2 transversely to the vertical axis of the tower wall 1.

[0029] In the operating state of the ammonia desulphurization oxidation tower 100, oxidation gas is supplied into the micro-porous aeration device 3 through the gas inlet 5 of the micro-porous aeration device 3. The oxidation gas can be aerated into gas bubbles 7 with a smaller diameter via the aeration holes 6 on the micro-porous aeration device 3. In other words, the oxidation gas in the micro-porous aeration device 3 can be discharged from the aeration holes 6 on the micro-porous aeration device 3 to form gas bubbles 7 with a smaller diameter in the solution. In the rising process of the gas bubbles 7 with a smaller diameter in the solution in the inner space 2, the gas bubbles 7 with a smaller diameter merge into gas bubbles 7' with a larger diameter. However, in the case of the same total volume, the gas bubbles 7 with a smaller diameter have a larger number and thus a larger specific surface area, while the gas bubbles 7' with a larger diameter have a smaller number and thus a smaller specific surface area. Therefore, the dissolution oxygen transfer rate of the gas bubbles 7' with a larger diameter is low (i.e. the transfer rate of oxygen in the oxidation gas into the ammonium sulfite solution is low), resulting in that the oxygen in the gas bubbles 7' cannot be well used to oxidize the ammonium sulfite in the ammonium sulfite solution. In the continuing rising process of the gas bubbles 7' with a larger diameter, the gas bubbles 7' with a larger diameter can be dispersed again into gas bubbles 7 with a smaller diameter by the oxidation gas distribution device 4 when passing through the oxidation gas distribution device 4. Therefore, by the oxidation gas distribution device 4, a larger number of gas bubbles 7 with a smaller diameter can be obtained again. This is beneficial to the sufficient oxidation of the ammonium sulfite in the ammonium sulfite solution by the oxygen in the gas bubbles 7.

[0030] Figure 2 A partial view of the oxidation gas distribution device 4 according to the first embodiment of the present application is schematically shown in a top view. Figure 2 A partial view of the oxidation gas distribution device 4 according to the first embodiment of the present application is schematically shown in a top view. Figure 2 The plate-shaped oxidation gas distribution device 4 has an outer peripheral shape which is adapted to the shape of the inner side of the tower wall 1 of the ammonia desulphurization oxidation tower 100, for example a circular shape. The oxidation gas distribution device 4 can have a plurality of beams, in the present case two beams 10, 11. Figure 2A top view of two cross beams 10 and two vertical beams 11 is shown in Fig. 1. In other embodiments, more or less cross beams 10 and / or more or less vertical beams 11 can be provided. The two cross beams 10 can be arranged parallel to each other at the same distance one after the other. Both ends of each cross beam 10 can be fixed, e.g. welded, to the tower wall 1 of the ammonia desulphurization oxidation tower 100, respectively. The two vertical beams 11 are likewise arranged parallel to each other at the same distance one after the other, and both ends of each vertical beam 11 are fixed, e.g. welded, to the tower wall 1 of the ammonia desulphurization oxidation tower 100, respectively. The two vertical beams 11 are arranged perpendicular to the two cross beams 10, respectively. The cross beams 10 can be continuous beams, while the vertical beams 11 are not continuous beams, and each vertical beam 11 can consist of a plurality of beam sections 11'. Each beam section 11' is arranged perpendicular between two adjacent cross beams 10 and fixed, e.g. welded, to the side walls of these two cross beams 10, such that the upper surface of the cross beams 10 and the upper surface of the vertical beams 11, respectively the beam sections 11', can lie in the same plane. However, it is also conceivable that the vertical beams 11 are continuous beams, while the cross beams 10 are not continuous beams, and each cross beam 10 can consist of a plurality of beam sections 10'. In some embodiments, the upper surfaces of the two cross beams 10 lie in one common plane, while the upper surfaces of the two vertical beams 11 lie in another common plane, which can be arranged parallel to each other at a distance. At this time, for example, all continuous cross beams 10 are arranged above all continuous vertical beams 11, or vice versa.

[0031] Thus, by the two cross beams 10 and the two vertical beams 11 arranged in this way, at least one rectangular air distribution module gap 12 and a plurality of solid module gaps (not shown) can be obtained on the oxidation gas distribution device 4 and thus in the cross section of the ammonia desulphurization oxidation tower 100. The air distribution module gap 12 can be delimited by the cross beams 10 and the vertical beams 11. The solid module gaps can be delimited by the cross beams 10, the vertical beams 11 and the tower wall 1. Here, the rectangular air distribution module gap 12 delimited by the cross beams 10 and the vertical beams 11 can have a length of 1 m to 5 m and a width of 0.2 m to 1 m, for example, such that it can allow a construction worker to pass through the air distribution module gap 12 for the assembly of the oxidation gas distribution device 4.

[0032] The oxidizing gas distribution device 4 can have at least one air distribution module 8. Each air distribution module 8 has a rectangular shape corresponding to an air distribution module void 12. Each air distribution module 8 can be laid on and cover one air distribution module void 12 accordingly. The air distribution module 8 can have a size slightly larger than the air distribution module void 12. In the case that the upper surface of the cross beam 10 and the upper surface of the vertical beam 11 are in the same plane, the air distribution module 8 can be fixed (e.g. welded) on the upper surface of the cross beam 10 and the upper surface of the vertical beam 11 with its four peripheral edges respectively lapping. In the case that the upper surface of the cross beam 10 and the upper surface of the vertical beam 11 are in different planes respectively, the air distribution module 8 can be fixed (e.g. welded) on the upper surface of the cross beam 10 or the vertical beam 11 which is lower with one pair of opposite edges lapping and on the side wall of the vertical beam 11 or the cross beam 10 which is higher with the other pair of opposite edges abutting.

[0033] A plurality of air holes 9 (e.g. circular air holes) can be provided on each air distribution module 8. The air holes 9 can be designed to disperse the larger diameter air bubbles 7' in the solution into smaller diameter air bubbles 7 when passing through the air holes 9 of the oxidizing gas distribution device 4 from bottom to top. Each air distribution module 8 can have the same external geometry (the external geometric shape and size of the air distribution module 8), the same air hole 9 distribution and the same air hole 9 size, where the "same air hole 9 distribution" means that different air distribution modules 8 are the same in terms of the number and relative position of the air holes 9. Therefore, a plurality of air distribution modules 8 can be punched with the same shape of plate material (e.g. metal plate material) at the same time via a common punching process while they are stacked on each other. Specifically, rectangular metal plate materials with the same length and width can be stacked together and then punched with a punching device to punch the air holes 9 at the same time. Compared with the prior art of punching air holes 9 on a one-piece or monolithic metal plate material which is adapted to the shape of the inner side of the tower wall 1 on its large surface to manufacture the oxidizing gas distribution device, this greatly reduces the punching steps and time, thereby simplifying the punching process.

[0034] The cross beams 10, the vertical beams 11 and the tower wall 1 can jointly define a solid module void. Such a solid module void can be covered with a solid module (not shown) which is solid, i.e. does not have air holes 9. The solid module can have a size which is slightly larger than the size of the solid module void, so that the solid module can be connected with its edges on the upper surfaces of the cross beams 10 and the vertical beams 11 and on the tower wall 1 and, if necessary, fixed, e.g. welded, on the upper surfaces of the cross beams 10 and the vertical beams 11 and on the tower wall 1. When the larger diameter bubbles 7' in the solution pass from below to above the oxidizing gas distribution device 4, the bubbles 7' can pass through the air distribution modules 8 on the air holes 9, but not through the solid module. The arrangement of such air distribution modules 8 with air holes 9 and solid modules can thus simplify the manufacture of the oxidizing gas distribution device 4 as a whole without significantly affecting the breaking up of the bubbles 7'.

[0035] In some not shown embodiments, some of the air distribution modules 8 can not have a complete rectangular shape, such air distribution modules 8 can for example be manufactured as profiled shapes by individually cutting out local areas of the rectangular air distribution modules 8. Thus, the air distribution modules 8 in order to adapt to the inner side circular arc shape of the tower wall 1 are cut near the corners of the tower wall 1 to circular arcs which adapt to the inner side shape of the tower wall 1. Corresponding profiled air distribution module voids 12 can be defined by the cross beams 10 and the vertical beams 11 and the tower wall 1. Thus, the profiled air distribution modules 8 can be fixed, e.g. welded, with their edges on the cross beams 10 and the vertical beams 11 and the tower wall 1.

[0036] In some not shown embodiments, a plurality of successive oxidizing gas distribution devices 4 can be arranged one after the other in vertical direction from below to above in the ammonia desulfurization oxidizing tower 100, which can all be manufactured modularly as described above. In such embodiments, after the smaller diameter bubbles 7 which have been dispersed by the first oxidizing gas distribution device 4 have recombined to larger diameter bubbles 7', the larger diameter bubbles 7' can be dispersed again to smaller diameter bubbles 7 by a second oxidizing gas distribution device 4 which is arranged downstream or above the first oxidizing gas distribution device 4.

[0037] In some not shown embodiments, for the case that the cross beams 10 and the upright beams 11 have a large net span or length, vertically arranged support columns (not shown) can be provided to vertically support the cross beams 10 and the upright beams 11. Such support columns can be supported with their upper end on the cross beams 10 or the upright beams 11 and with their lower end on the bottom of the ammonia desulfurization oxidation tower 100 or on the cross beams 10 or the upright beams 11 of the underlying oxidation gas distribution device 4. Alternatively or additionally, also obliquely arranged support columns (not shown) can be provided, which can be supported with their upper end on the cross beams 10 or the upright beams 11 and with their lower end on the tower wall 1 of the ammonia desulfurization oxidation tower 100.

[0038] Figure 3 A partial view of the oxidation gas distribution device 4 according to the second embodiment of the present application is schematically shown in a top view. Figure 3 Two air distribution modules 8 are schematically shown together with the beams 10, 11 and 14, which are shown in a partial view. In contrast to the oxidation gas distribution device 4 of the first embodiment, the oxidation gas distribution device 4 of the second embodiment can have at least two cross beams 10 and two upright beams 11. The cross beams 10 and the upright beams 11 can be arranged perpendicular to each other, so that at least the cross beam sections 10' and the upright beam sections 11' form a square. The oxidation gas distribution device 4 of the second embodiment can also have at least one oblique beam 14. The oblique beam 14 is connected at least at the connection of the cross beam 10 and the upright beam 11. By such an arrangement of the cross beams 10 and the upright beams 11 and the oblique beam 14, two isosceles triangular air distribution module voids 12 are delimited. Correspondingly, two isosceles triangular air distribution modules 8 cover the two isosceles triangular air distribution module voids, respectively. Further, the other aspects of the oxidation gas distribution device 4 as explained with respect to the first embodiment can also be appropriately transferred to the oxidation gas distribution device 4 of the second embodiment, which will not be repeated here.

[0039] Finally, it is pointed out that the above-described embodiments are merely for the purpose of understanding and explaining the present application and do not constitute a limitation of the scope of protection of the present application. Modifications can be made to the above-described embodiments by a person skilled in the art on the basis of the above description, without departing from the scope of protection of the present application.

Claims

1. An ammonia desulphurization oxidation tower, characterized in that, The ammonia desulfurization oxidation tower (100) comprises at least one plate-like oxidation gas distribution device (4) having a plurality of plate modules independent of one another, at least one of the plate modules being configured as an air distribution module (8) with air holes (9).

2. The ammonia-based desulfurization oxidation column according to claim 1, characterized in that, The oxidation gas distribution device (4) is arranged in the interior space (2) delimited by the tower wall (1) transversely to the vertical axis of the tower wall (1), wherein the oxidation gas distribution device (4) has a plurality of beams arranged transversely to the tower wall (1), the beams being fixed to the tower wall (1), dividing a plurality of voids independent of one another in the cross section of the interior space (2) of the tower wall (1) by the beams, and the plate modules covering the voids, respectively.

3. The ammonia-based desulfurization oxidation column according to claim 1, characterized in that, There are a plurality of air distribution modules (8), at least two of the air distribution modules (8) having the same geometric structure and / or the same air hole distribution and / or the same air hole (9) size.

4. The ammonia-based desulfurization oxidation column according to claim 2, characterized in that, The beams are arranged transversely to one another such that the void covered by the air distribution module (8) is delimited at least by the beams surrounding the void.

5. The ammonia-based desulfurization oxidation column according to claim 2, characterized in that, The beams comprise a first beam (10) and a second beam (11) arranged perpendicularly to the first beam (10), the void covered by the air distribution module (8) being delimited peripherally by the first beam (10) and the second beam (11).

6. The ammonia-based desulfurization oxidation column according to claim 2, characterized in that, The beams comprise a first beam (10), a second beam (11) arranged perpendicularly to the first beam (10), and a third beam (12) arranged obliquely to the first beam (10) and the second beam (11), the void covered by the air distribution module (8) being delimited peripherally by at least two of the first beam (10), the second beam (11), and the third beam (12).

7. The amine gas sweetening oxidation column according to any one of claims 1 to 6, characterized in that, At least one of the plate modules is configured as a solid module without air holes (9).

8. The ammonia-based desulfurization oxidation column according to claim 2, characterized in that, The plate modules are connected to the beams at least partially in a lapping manner.

9. The ammonia-based desulfurization oxidation column according to claim 2, characterized in that, There are support columns supporting the beams upwardly transversely to the beams.

10. The amine-based desulfurization oxidation column according to any one of claims 1 to 6, characterized in that, The ammonia desulfurization oxidation tower (100) has a plurality of oxidation gas distribution devices (4) arranged one after another in the vertical direction thereof.

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