Phosphoric acid tail gas washing tower

Abstract

The utility model relates to the technical field of wet-process phosphoric acid, in particular to a phosphoric acid tail gas washing tower. The washing tower comprises a first-stage washing tower (1), a second-stage washing tower (2), a demister (3), a first-stage washing tower circulating tank (4), a gas phase inlet (5), a second-stage washing tower collecting tank (6) and an air duct cap (7); the first-stage washing tower (1) is arranged at the bottom of a tower body, the second-stage washing tower (2) is arranged at the upper part of the first-stage washing tower (1), and the second-stage washing tower collecting tank (6) and the air duct cap (7) are arranged between the first-stage washing tower (1) and the second-stage washing tower (2); a first-stage washing tower circulating tank (4) is arranged below the first-stage washing tower (1), and a gas phase inlet (5) is formed in the side of the first-stage washing tower (1); and a demister (3) is arranged at the upper part of the secondary washing tower (2). The anti-corrosion structure has the advantages of simple structure, simple anti-corrosion construction and low cost. The washing effect is good. Use and maintenance are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of wet-process phosphoric acid, in particular to a phosphoric acid tail gas washing tower. Background Art

[0002] At present, in phosphoric acid chemical phosphoric acid units, phosphoric acid tail gas washing towers generally adopt multi-stage washing towers (often divided into two-stage washing). The demisters are manufactured separately and then connected in series with pipelines to form a systematic washing system layout. Because at least three washing equipment need to be arranged, the site occupies a large area, the equipment and pipeline investment is large, the control process is long, the subsequent maintenance cost is high, and the failure rate is high. Utility Model Content

[0003] The utility model aims to overcome the above technical problems and provide a phosphoric acid tail gas washing tower with multi-stage washing and defoaming functions, small footprint, low investment and few control processes.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows.

[0005] A phosphoric acid tail gas scrubber, comprising a primary scrubber 1, a secondary scrubber 2, a demister 3, a primary scrubber circulation tank 4, a gas phase inlet 5, a secondary scrubber collecting tank 6 and a wind tube cap 7;

[0006] The primary washing tower 1 is arranged at the bottom of the tower body, the secondary washing tower 2 is arranged at the upper part of the primary washing tower 1, and a secondary washing tower collecting tank 6 and a wind cylinder cap 7 are arranged between the primary washing tower 1 and the secondary washing tower 2;

[0007] A primary washing tower circulation tank 4 is arranged below the primary washing tower 1, and a gas phase inlet 5 is arranged on the side of the primary washing tower 1;

[0008] A demister 3 is provided on the upper part of the secondary washing tower 2.

[0009] Furthermore, the scrubbing tower further comprises a tail gas emission chimney 8 ; the tail gas emission chimney 8 is arranged on the upper part of the demister 3 .

[0010] Further, the washing tower also includes a sprayer I9 and a sprayer II10;

[0011] The sprayer I9 and the sprayer II10 are respectively arranged on the side walls of different heights on both sides of the primary washing tower 1.

[0012] Furthermore, the sprayer I9 and the sprayer II10 are respectively connected to the primary washing tower circulation tank 4 by pipelines, and a circulation pump is provided on the pipeline.

[0013] Furthermore, the washing tower further comprises a sprayer III11, a sprayer IV12 and a sprayer V13;

[0014] The sprayer III 11, the sprayer IV 12 and the sprayer V 13 are respectively arranged on the side walls at different heights on both sides of the secondary scrubbing tower 2.

[0015] Furthermore, the sprayer III 11, the sprayer IV 12 and the sprayer V 13 are respectively communicated with the collection tank 6 of the secondary scrubbing tower by pipelines, and a circulation pump is arranged on the pipeline.

[0016] Furthermore, the tower body of the scrubbing tower adopts a structure of carbon steel lined with pre-vulcanized rubber sheets, and the bottom of the tower is lined with carbon bricks.

[0017] Furthermore, the materials of the demister 3 and the tail gas discharge chimney 8 are fiberglass reinforced plastic.

[0018] Furthermore, the top parts of the cones of the demister 3 and the air duct cap 7 are lined with carbon bricks.

[0019] Furthermore, a liquid discharge port is arranged at the bottom of the tower body of the scrubbing tower.

[0020] A phosphoric acid tail gas scrubbing tower provided by the utility model integrates a primary scrubbing tower, a secondary scrubbing tower and a demister in one tower. The primary scrubbing tower is arranged at the bottom, the secondary scrubbing tower is arranged at the upper part, and the demister is arranged in the middle of the two-stage scrubbing towers. A scrubbing water tank is arranged in each stage of the scrubbing tower to facilitate the collection of the scrubbing liquid for recycling by the scrubbing pump. The demister adopts a porous conical structure to meet the requirements of gas discharge and facilitate the collection of the scrubbing liquid. The tower body adopts a structure of carbon steel lined with pre-vulcanized rubber sheets, and the bottom of the tower and the top of the cone of the demister are lined with carbon bricks for protection to prevent damage to the rubber lining during operation, maintenance and cleaning. Finally, the tail gas after scrubbing is discharged through the top chimney of the secondary scrubbing tower.

[0021] A phosphoric acid tail gas scrubbing tower provided by the utility model simplifies the manufacturing process, is convenient for installation, simplifies the anti-corrosion construction, saves investment, significantly improves the scrubbing effect, makes the tail gas discharge meet the standards, and meets the environmental protection requirements through the transformation of the phosphoric acid tail gas scrubbing tower. After the transformation by the utility model, the restriction that multi-stage towers cannot be continuously arranged due to on-site land occupation limitation is completely solved. At the same time, problems such as serious fluoride and water vapor carried by the flue gas are solved. The dilemma of frequent use and maintenance and frequent fault repair is also solved, the process requirements are improved, and the investment is saved.

[0022] The utility model provides a phosphoric acid tail gas washing tower, the tower body adopts a carbon steel lining pre-vulcanized rubber plate and a carbon brick lining structure, the lower part is a primary washing tower, the upper part is a secondary washing tower, the middle connecting part is a wind tube cap and a collecting tank of the secondary washing tower, which is used to allow the tail gas washed by the primary washing tower to enter the secondary washing tower and collect the washing liquid of the secondary washing tower for cyclic washing. The primary washing tower is provided with a gas phase inlet, and the spiral line enters the secondary washing tower after 2 layers of spray washing. The tail gas passes through 3 layers of spray washing in the secondary washing tower, and the tail gas is then removed from the liquid by the demister at the upper part of the secondary washing tower, and finally discharged into the atmosphere through the chimney. The demister and the chimney are made of glass fiber reinforced plastics, and the demister adopts a double-channel folded line discharge. After passing through the demister, the liquid in the flue gas is removed to the greatest extent. A cleaning port is arranged on the tower body to facilitate the cleaning and installation of the demister. The phosphoric acid tail gas washing tower provided by the utility model has the advantages of easier installation, longer service life, less maintenance frequency, and has achieved good results in actual construction.

[0023] Compared with the prior art, the advantages of the phosphoric acid tail gas scrubber provided by the utility model are:

[0024] (1) Simple structure, simple anti-corrosion construction and low cost.

[0025] (2) Good washing effect.

[0026] (3) Easy to use and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The utility model provides a schematic diagram of the structure of a phosphoric acid tail gas washing tower.

[0028] Figure 2 The utility model provides a schematic diagram of the connection structure between a demister and an exhaust gas emission chimney in a phosphoric acid exhaust gas washing tower.

[0029] In the figure, 1 is a primary washing tower, 2 is a secondary washing tower, 3 is a demister, 4 is a primary washing tower circulation tank, 5 is a gas phase inlet, 6 is a secondary washing tower collecting tank, 7 is a wind tube cap, 8 is an exhaust gas emission chimney, 9 is a sprayer I, 10 is a sprayer II, 11 is a sprayer III, 12 is a sprayer IV, and 13 is a sprayer V. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is further described in detail in the following embodiments. The following embodiments are only used to illustrate the utility model, but are not used to limit the scope of the utility model.

[0031] Example 1

[0032] Combination Figure 1 and 2As shown in the figure, a phosphoric acid tail gas scrubbing tower includes a primary scrubbing tower 1, a secondary scrubbing tower 2, a demister 3, a primary scrubbing tower circulation tank 4, a gas phase inlet 5, a secondary scrubbing tower collection tank 6, and a chimney cap 7. The primary scrubbing tower 1 is arranged at the bottom of the tower body, the secondary scrubbing tower 2 is arranged above the primary scrubbing tower 1, and the secondary scrubbing tower collection tank 6 and the chimney cap 7 are arranged between the primary scrubbing tower 1 and the secondary scrubbing tower 2. The primary scrubbing tower circulation tank 4 is arranged below the primary scrubbing tower 1, and the gas phase inlet 5 is arranged on the side of the primary scrubbing tower 1. The demister 3 is arranged above the secondary scrubbing tower 2.

[0033] The scrubbing tower further includes a tail gas discharge chimney 8, which is arranged above the demister 3. The scrubbing tower further includes a sprayer I 9 and a sprayer II 10, which are respectively arranged on the side walls of different heights on both sides of the primary scrubbing tower 1.

[0034] The sprayer I 9 and the sprayer II 10 are respectively connected to the primary scrubbing tower circulation tank 4 by pipelines, and a circulation pump is arranged on the pipeline. The scrubbing tower further includes a sprayer III 11, a sprayer IV 12, and a sprayer V 13, which are respectively arranged on the side walls of different heights on both sides of the secondary scrubbing tower 2. The sprayer III 11, the sprayer IV 12, and the sprayer V 13 are respectively connected to the secondary scrubbing tower collection tank 6 by pipelines, and a circulation pump is arranged on the pipeline. A liquid discharge port is arranged at the bottom of the tower body of the scrubbing tower.

[0035] Example 2

[0036] Combined with Figure 1 and 2 As shown in the figure, a phosphoric acid tail gas scrubbing tower includes a primary scrubbing tower 1, a secondary scrubbing tower 2, a demister 3, a primary scrubbing tower circulation tank 4, a gas phase inlet 5, a secondary scrubbing tower collection tank 6, and a chimney cap 7. The primary scrubbing tower 1 is arranged at the bottom of the tower body, the secondary scrubbing tower 2 is arranged above the primary scrubbing tower 1, and the secondary scrubbing tower collection tank 6 and the chimney cap 7 are arranged between the primary scrubbing tower 1 and the secondary scrubbing tower 2. The primary scrubbing tower circulation tank 4 is arranged below the primary scrubbing tower 1, and the gas phase inlet 5 is arranged on the side of the primary scrubbing tower 1. The demister 3 is arranged above the secondary scrubbing tower 2.

[0037] The described scrubber further includes an exhaust gas chimney 8; the exhaust gas chimney 8 is arranged above the demister 3. The described scrubber further includes a sprayer I 9 and a sprayer II 10; the sprayer I 9 and the sprayer II 10 are respectively arranged on the side walls at different heights on both sides of the primary scrubber 1. The sprayer I 9 and the sprayer II 10 are respectively communicated with the primary scrubber circulation tank 4 through pipelines, and a circulation pump is arranged on the pipeline. The described scrubber further includes a sprayer III 11, a sprayer IV 12 and a sprayer V 13; the sprayer III 11, the sprayer IV 12 and the sprayer V 13 are respectively arranged on the side walls at different heights on both sides of the secondary scrubber 2. The sprayer III 11, the sprayer IV 12 and the sprayer V 13 are respectively communicated with the secondary scrubber collection tank 6 through pipelines, and a circulation pump is arranged on the pipeline.

[0038] The tower body of the described scrubber adopts a structure of carbon steel lined with pre-vulcanized rubber sheets, and the bottom of the tower is lined with carbon bricks. The materials of the demister 3 and the exhaust gas chimney 8 are fiberglass reinforced plastic. The conical top parts of the demister 3 and the air duct cap 7 are lined with carbon bricks. A liquid discharge port is arranged at the bottom of the tower body of the scrubber.

[0039] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept scope of the present invention, various transformations can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0040] In addition, it should be noted that, in the various specific technical features and steps described in the above specific embodiments, they can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0041] In addition, any combination can be made between various different embodiments of the present invention, as long as it does not violate the idea of the present invention, it should also be regarded as the content disclosed by the present invention.

Claims

1. A phosphoric acid tail gas scrubber, characterized in that: The washing tower comprises a primary washing tower (1), a secondary washing tower (2), a demister (3), a primary washing tower circulation tank (4), a gas phase inlet (5), a secondary washing tower collecting tank (6) and a wind tube cap (7); The primary washing tower (1) is arranged at the bottom of the tower body, the secondary washing tower (2) is arranged on the upper part of the primary washing tower (1), and a secondary washing tower collecting tank (6) and a wind tube cap (7) are arranged between the primary washing tower (1) and the secondary washing tower (2); A primary washing tower circulation tank (4) is arranged below the primary washing tower (1), and a gas phase inlet (5) is arranged on the side of the primary washing tower (1); A demister (3) is arranged on the upper part of the secondary washing tower (2).

2. A phosphoric acid tail gas scrubbing tower according to claim 1, characterized in that: The scrubbing tower further comprises a tail gas emission chimney (8); the tail gas emission chimney (8) is arranged on the upper part of the demister (3).

3. A phosphoric acid tail gas scrubbing tower according to claim 1, characterized in that: The washing tower further comprises a sprayer I (9) and a sprayer II (10); The sprayer I (9) and the sprayer II (10) are respectively arranged on the side walls of different heights on both sides of the primary washing tower (1).

4. A phosphoric acid tail gas scrubbing tower according to claim 3, characterized in that: The sprayer I (9) and the sprayer II (10) are respectively connected to the primary washing tower circulation tank (4) through pipelines, and a circulation pump is arranged on the pipeline.

5. A phosphoric acid tail gas scrubbing tower according to claim 3, characterized in that: The washing tower further comprises a sprayer III (11), a sprayer IV (12) and a sprayer V (13); The sprayer III (11), the sprayer IV (12) and the sprayer V (13) are respectively arranged on the side walls of different heights on both sides of the secondary washing tower (2).

6. A phosphoric acid tail gas scrubbing tower according to claim 5, characterized in that: The sprayer III (11), the sprayer IV (12) and the sprayer V (13) are respectively connected to the secondary washing tower collecting tank (6) through pipelines, and a circulation pump is arranged on the pipeline.

7. A phosphoric acid tail gas scrubbing tower according to claim 1, characterized in that: The tower body of the washing tower adopts a carbon steel lined pre-vulcanized rubber plate structure, and the bottom of the tower is lined with carbon bricks.

8. A phosphoric acid tail gas scrubbing tower according to claim 2, characterized in that: The demister (3) and the tail gas emission chimney (8) are made of glass fiber reinforced plastics.

9. A phosphoric acid tail gas scrubbing tower according to claim 2, characterized in that: The cone tops of the demister (3) and the wind tube cap (7) are lined with carbon bricks.

10. A phosphoric acid tail gas scrubbing tower according to claim 1, characterized in that: A liquid discharge port is arranged at the bottom of the tower body of the washing tower.

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