Drying absorption tower for removing acid mist in flue gas

Abstract

The utility model belongs to the field of sulfuric acid manufacturing, and particularly relates to a drying absorption tower for removing acid mist in flue gas, which comprises a flue gas inlet, a flue gas outlet, a ceramic ring filler, an acid distributor tube nest, a fiber demister, a fiber demister disc chuck, a plurality of acid seals and a plurality of overflow pipes, the ceramic ring filler is arranged in the acid distributor, the acid distributor tube nest is positioned above the ceramic ring filler, the fiber demister disc chuck is positioned above the acid distributor tube nest, the fiber demister is arranged at the upper part of the fiber demister disc chuck, the plurality of acid seals are arranged below the fiber demister disc chuck, and a plurality of acid liquor drainage tubes are arranged in the fiber demister disc chuck and are used for draining acid liquor into the plurality of acid seals; the plurality of overflow pipes are respectively arranged on the side surfaces of the plurality of acid seals, the upper ends of the overflow pipes are communicated with the acid seals, and the overflow pipes are positioned below the acid distributor tube nests. According to the scheme, the acid mist in the flue gas can be more efficiently removed in the sulfuric acid production process, and meanwhile corrosion to the acid distributor tube nest in the drying absorption tower is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of sulfuric acid manufacturing, and particularly relates to a drying absorption tower for removing acid mist in flue gas. BACKGROUND

[0002] The statements in this section merely provide background information related to the technical solutions of the present application and can not constitute the prior art of the technical solutions of the present application.

[0003] In an acid-making system, a drying absorption tower is a commonly used device. The flue gas inlet of the drying absorption tower is usually located at the lower side of the tower body to ensure that the flue gas can smoothly enter the tower and fully contact and react with the acid liquid or other absorption medium in the tower. The flue gas outlet of the drying absorption tower is usually located at the upper part of the tower body, and the purified flue gas is discharged from the upper outlet after fully contacting and reacting with the acid liquid or other absorption medium in the tower. In the existing drying absorption tower, due to various reasons (for example, uneven distribution of acid, powdering of filler, improper control of acid temperature, improper control of acid concentration, etc.), a certain amount of acid mist may still be contained in the flue gas discharged from the outlet, which will enter the subsequent conversion section, and long-term over-standard acid mist will cause acid accumulation, corrosion of equipment, and serious cost loss. SUMMARY

[0004] In order to more efficiently remove acid mist in flue gas in the drying absorption tower while avoiding adverse effects on the equipment in the drying absorption tower (for example, causing corrosion of the equipment), the present application provides a drying absorption tower for removing acid mist in flue gas, which comprises a flue gas inlet, a flue gas outlet, porcelain ring filler, acid distributor pipe, fiber demister, fiber demister flower disc, multiple acid seals, and multiple overflow pipes. The flue gas inlet is located at the bottom side of the drying absorption tower, the flue gas outlet is located at the top of the drying absorption tower, the porcelain ring filler is located at the lower part of the drying absorption tower, the acid distributor pipe is located above the porcelain ring filler, the fiber demister flower disc is located above the acid distributor pipe, the fiber demister is installed on the upper part of the fiber demister flower disc, the multiple acid seals are arranged below the fiber demister flower disc, multiple acid liquid drainage pipes are arranged in the fiber demister flower disc for draining acid liquid into the multiple acid seals, and the multiple overflow pipes are arranged on the side of the multiple acid seals, respectively. The upper end of the overflow pipe is in communication with the acid seal, and the lower end is located below the acid distributor pipe to guide the acid liquid in the acid seal to the porcelain ring filler.

[0005] In one embodiment, the acid distributor pipe comprises an acid distributor main pipe, multiple acid distributor branch pipes in communication with the acid distributor main pipe, and multiple acid distributor nozzles located at the end of the multiple acid distributor branch pipes.

[0006] In one embodiment, the fiber demister is detachably installed on the upper part of the fiber demister flower disc.

[0007] In one embodiment, the ceramic ring packing is a ceramic corrugated packing or a ceramic Pall ring.

[0008] In one embodiment, the lower end of the overflow pipe extends into the ceramic ring packing.

[0009] In one embodiment, the acid seal is fixedly connected to the bottom of the fiber mist eliminator disc.

[0010] In one embodiment, the overflow pipe is made of 316L stainless steel.

[0011] By adopting the scheme of the present application, acid mist in flue gas can be more efficiently removed in a sulfuric acid production process, while avoiding corrosion of the acid distributor tubes in the dry absorption tower. BRIEF DESCRIPTION OF DRAWINGS

[0012] Embodiments of the present application will be further described below with reference to the accompanying drawings, in which:

[0013] Figure 1 A structural schematic diagram of a dry absorption tower for removing acid mist in flue gas according to one embodiment is shown. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the accompanying drawings through specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0015] Figure 1 A structural schematic diagram of a dry absorption tower for removing acid mist in flue gas according to one embodiment is shown. The dry absorption tower 1 includes a flue gas inlet 8, a flue gas outlet 9, a ceramic ring packing 7, an acid distributor tube 6, a fiber mist eliminator 2, a fiber mist eliminator disc 3, a plurality of acid seals 4, and a plurality of overflow pipes 5.

[0016] The flue gas inlet 8 is located at the bottom side of the dry absorption tower, and the flue gas outlet 9 is located at the top of the dry absorption tower. The ceramic ring packing 7 is located at the lower part of the dry absorption tower, the acid distributor tube 6 is located above the ceramic ring packing 7, the fiber mist eliminator disc 3 is located above the acid distributor tube 6, and the fiber mist eliminator 2 is installed on the upper part of the fiber mist eliminator disc 3.

[0017] The ceramic ring packing 7 mainly serves to increase the gas-liquid contact area, promote the mixing and mass transfer of gas and liquid, improve the absorption efficiency of sulfuric acid through its structure and material, and has good corrosion resistance and high temperature resistance, ensuring the stable operation of the dry absorption tower. The ceramic ring packing may, for example, be a ceramic corrugated packing or a ceramic Pall ring.

[0018] The main function of the acid distributor tube 6 is to spray the concentrated sulfuric acid uniformly to the surface of the porcelain ring packing 7, so that the flue gas can be in full contact with the concentrated sulfuric acid in the porcelain ring packing 7, thereby improving the contact efficiency and enhancing the absorption effect.

[0019] In one embodiment, the acid distributor tube 6 comprises an acid distributor main pipe, a plurality of acid distributor branch pipes in communication with the acid distributor main pipe, and a plurality of acid distributor nozzles at the ends of the plurality of acid distributor branch pipes.

[0020] The fiber mist eliminator 2 is used to further absorb the acid mist present in the flue gas before the flue gas is discharged from the flue gas outlet 9. The fiber mist eliminator 2 generally comprises a plurality of mist eliminator elements installed in a container or tank, when the gas containing mist particles passes through, the mist particles will be captured on the fibers of the mist eliminator by inertial impaction, direct interception, and Brownian motion principle, and gradually coalesce into large particles or liquid films, and then reach the fiber mist eliminator flower disc 3 under the action of gravity, thereby achieving the effect of capturing mist liquid and purifying gas.

[0021] In one embodiment, the fiber mist eliminator 2 is detachably installed on the upper part of the fiber mist eliminator flower disc 3 to facilitate maintenance and replacement of the fiber mist eliminator 2.

[0022] The acid liquid collected by the fiber mist eliminator 2 eventually reaches the fiber mist eliminator flower disc 3. A plurality of acid liquid drainage pipes 10 are provided in the fiber mist eliminator flower disc 3 for draining the acid liquid to a plurality of acid seals 4 provided below the fiber mist eliminator flower disc 3.

[0023] The plurality of acid seals 4 are used to collect and store acid liquid. The acid seals 4 can be fixed or installed in any feasible manner, and in one embodiment, the acid seals 4 are fixedly connected to the bottom of the fiber mist eliminator flower disc 3.

[0024] When the acid seals 4 are filled with acid liquid, the acid liquid will overflow and flow onto the acid distributor tube 6 below the acid seals 4, which will significantly accelerate the corrosion of the acid distributor tube 6 below the acid seals 4 if it continues for a long time, thereby reducing the service life of the entire acid distributor tube 6. In order to avoid this problem, overflow pipes 5 are provided on the sides of each acid seal 4. The upper end of the overflow pipe 5 is in communication with the acid seal 4, and the lower end is located below the acid distributor tube 6 to guide the acid liquid in the acid seal 4 to the porcelain ring packing 7 without contacting the acid distributor tube 6, effectively avoiding the corrosion of the acid distributor tube 6 and reducing the production and equipment maintenance costs.

[0025] In one embodiment, the lower end of the overflow pipe 5 extends into the porcelain ring packing 7.

[0026] In one embodiment, the material of the overflow pipe 5 is 316L stainless steel.

[0027] Reference herein to "various embodiments," "some embodiments," "one embodiment," or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. The appearances of the phrase "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It will be appreciated that the particular features, structures, or characteristics described in one embodiment can be combined, in whole or in part, with one or more other embodiments without necessarily being limited to the combination described for the one embodiment. Expressions such as "based on," "applied to," "composed of," or "comprising of" as used herein are intended to be non-exclusive, i.e., to include the stated feature, structure, or characteristic, but not to exclude others. In the present application, some of the schematic operation steps are described in a certain order for the sake of clarity, but it can be understood by those skilled in the art that each of the operation steps is not essential, and some of the steps can be omitted or replaced by other steps. The operation steps also do not have to be executed sequentially as shown, but some of the operation steps can be executed in a different order or in parallel, as long as the new execution manner is not illogical or inoperable.

[0028] Some exemplary embodiments of the present application are described above, and it can be understood that the above embodiments are only used to explain the present application, and do not constitute a limitation on the protection scope of the present application. The features in these embodiments can be recombined in a suitable manner, and the schemes obtained thereby are still within the protection scope of the present application. Based on the above embodiments, all other embodiments obtained by those skilled in the art without making creative efforts, i.e., all modifications, equivalent replacements, and improvements, etc. made within the spirit and principles of the present application, are also within the protection scope of the present application.

Claims

1. A dry absorption tower for removing acid mist from flue gas, characterized in that, The dry absorption tower comprises a flue gas inlet (8), a flue gas outlet (9), a porcelain ring filler (7), a distributor column (6), a fiber mist eliminator (2), a fiber mist eliminator flower disc (3), a plurality of acid seals (4), and a plurality of overflow pipes (5). The flue gas inlet (8) is located at the bottom side of the dry absorption tower, the flue gas outlet (9) is located at the top of the dry absorption tower, the porcelain ring filler (7) is located at the lower part of the dry absorption tower, the distributor column (6) is located above the porcelain ring filler (7), the fiber mist eliminator flower disc (3) is located above the distributor column (6), the fiber mist eliminator (2) is installed at the upper part of the fiber mist eliminator flower disc (3), the plurality of acid seals (4) are arranged below the fiber mist eliminator flower disc (3), a plurality of acid liquid drainage pipes (10) are arranged in the fiber mist eliminator flower disc (3) for draining acid liquid into the plurality of acid seals (4), and the plurality of overflow pipes (5) are arranged at the sides of the plurality of acid seals (4), respectively.

2. The drying absorption column according to claim 1, characterized in that The distributor column (6) comprises a distributor main pipe, a plurality of distributor branch pipes in communication with the distributor main pipe, and a plurality of distributor nozzles at the ends of the plurality of distributor branch pipes.

3. The drying absorption column according to claim 1, characterized in that The fiber mist eliminator (2) is detachably installed at the upper part of the fiber mist eliminator flower disc (3).

4. The drying absorption column of claim 1, wherein, The porcelain ring filler (7) is a porcelain corrugated filler or a ceramic Pall ring.

5. The drying absorption column of claim 1, wherein, The lower end of the overflow pipe (5) extends into the porcelain ring filler (7).

6. The drying absorption column of claim 1, wherein, The acid seal (4) is fixedly connected with the bottom of the fiber mist eliminator flower disc (3).

7. The drying absorption column of claim 1, wherein, The overflow pipe (5) is made of 316L stainless steel.

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