Urotropine tail gas ammonia formaldehyde vapor countercurrent spray recovery device

Abstract

The utility model relates to the technical field of tail gas treatment of chemical production, concretely is the urotropine tail gas ammonia formaldehyde steam countercurrent spray recovery device, including first spray tray, first spray tray one side symmetry fixedly connected with first water pipe, first water pipe one side fixedly connected with second spray tray, second spray tray one side symmetry fixedly connected with two groups of second water pipe, second water pipe one side fixedly connected with third spray tray, and first spray tray, second spray tray and third spray tray are equipped with the air passing round hole, and the air passing round hole one side fixedly connected with annular spray head, the urotropine tail gas ammonia formaldehyde steam countercurrent spray recovery device that the utility model puts forward mainly passes through installing the first spray tray, second spray tray and third spray tray that intercommunication in the spray tower, and three groups of spray trays are respectively out of position set multiple air passing round holes, and the tail gas passes through three layers air passing round holes in turn, and the annular spray head with inclined downward spray hole can be good to tail gas countercurrent spray, improves the absorption efficiency of ammonia and formaldehyde.

Description

Technical Field

[0001] This utility model relates to the field of chemical production tail gas treatment technology, specifically a countercurrent spray recovery device for hexamethylenetetramine tail gas ammonia-formaldehyde vapor. Background Technology

[0002] Hexamethylenetetramine (HMT) is an important chemical raw material widely used in resin curing agents, rubber vulcanization accelerators, and pharmaceutical preservatives. Its industrial production mainly adopts the liquid phase method, which is generated by the condensation of formaldehyde and excess ammonia in an alkaline solution. During the process, tail gas containing ammonia (NH3) and formaldehyde (HCHO) is produced. Since both ammonia (NH3) and formaldehyde (HCHO) are easily soluble in water, a spray tower is usually used to recover ammonia and formaldehyde.

[0003] Chinese Patent CN222196455U discloses a circulating ammonia recovery device for urotropine production, including a spray tower, a first spray assembly, and a first guide hood. A first recovery tank is fixed at the bottom inside the spray tower, and an air inlet assembly is provided on one side of the first recovery tank. The first spray assembly is installed on the upper outside of the first recovery tank. The advantages are: the first and second spray assemblies facilitate secondary spraying of ammonia-containing gas during urotropine production; the ammonia-containing water flow after spraying can be recycled; during the upward movement of the sprayed gas, it can contact the inner wall of the inverted funnel-shaped first guide hood, allowing the ammonia-containing water vapor in the gas to condense and flow back into the first recovery tank along the inclined inner wall of the first guide hood; similarly, the second guide hood can re-collect the ammonia-containing water vapor in the gas after secondary spraying, thus avoiding the situation where ammonia in the ammonia-containing water vapor is difficult to recover.

[0004] The above-mentioned solutions and existing technologies for urotropine production tail gas absorption spray towers typically involve introducing tail gas from the bottom of the spray tower, where it passes through spray nozzles inside the tower and is sprayed as water mist. The tail gas and water mist move in opposite directions, creating a counter-current spraying effect. Ammonia and formaldehyde dissolve in the water mist and drip to the bottom of the tower. A water pump then discharges the liquid containing dissolved ammonia and formaldehyde into a collection tank. Existing spray towers usually have a simple annular spray device with multiple sets of nozzles directly fixed inside. However, some tail gas still overflows from areas not covered by the spray and is discharged from the top of the spray tower, meaning the discharged gas still contains ammonia and formaldehyde, polluting the air and harming the health of employees. Utility Model Content

[0005] The purpose of this invention is to provide a countercurrent spray recovery device for hexamethylenetetramine tail gas ammonia-formaldehyde vapor to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A urotropine tail gas ammonia-formaldehyde vapor countercurrent spray recovery device includes a first spray plate, a first water pipe symmetrically and fixedly connected to one side of the first spray plate, a second spray plate symmetrically and fixedly connected to one side of the first water pipe, two sets of second water pipes symmetrically and fixedly connected to one side of the second spray plate, a third spray plate symmetrically and fixedly connected to one side of the second water pipe, and two sets of mounting blocks symmetrically and fixedly connected to one side of the third spray plate. The first spray plate, the second spray plate, and the third spray plate are provided with air passage holes, and an annular spray head is fixedly connected to one side of the air passage holes.

[0007] Preferably, a conical ventilator is fixedly connected to one side of the first spray plate and the second spray plate, and the conical ventilator is located on one side of the air passage hole.

[0008] Preferably, two sets of first connecting columns are symmetrically fixedly connected to one side of the second spray plate, and two sets of second connecting columns are symmetrically fixedly connected to the other side of the second spray plate. One side of the first connecting column is fixedly connected to the first spray plate, and one side of the second connecting column is fixedly connected to the third spray plate.

[0009] Preferably, the first connecting column and the second connecting column are respectively provided with drainage holes on one side.

[0010] Preferably, the mounting block has a drainage hole in the middle and two sets of mounting holes symmetrically arranged on both sides of the mounting block.

[0011] Preferably, the annular spray head has uniformly arranged oblique downward spray holes on one side, and the air passage holes located on the second spray plate are staggered from those located on the first and third spray plates.

[0012] Compared with the prior art, the beneficial effects of this utility model are: The hexamethylenetetramine tail gas ammonia-formaldehyde vapor countercurrent spray recovery device proposed in this utility model mainly involves installing a first spray plate, a second spray plate, and a third spray plate that are interconnected inside a spray tower. Multiple sets of air passage holes are staggered on the three sets of spray plates. The tail gas passes through the three layers of air passage holes in sequence. The air passage holes are connected to annular spray heads with inclined downward spray holes, which can effectively perform countercurrent spraying on the passing tail gas, increase the contact time between the tail gas and the spray liquid, and improve the absorption efficiency of ammonia and formaldehyde in the tail gas. Attached Figure Description

[0013] Figure 1 A schematic diagram of the countercurrent spray recovery device for urotropine tail gas ammonia-formaldehyde vapor; Figure 2 Another structural schematic diagram of the urotropine tail gas ammonia-formaldehyde vapor countercurrent spray recovery device. Figure 3 for Figure 1Partial structural cross-sectional view from the perspective of AA (American Academy of Sciences); Figure 4 for Figure 3 Enlarged schematic diagram of the structure at part A in the middle.

[0014] In the diagram: 1. First spray plate; 2. First water pipe; 3. Second spray plate; 4. Second water pipe; 5. Third spray plate; 6. Air passage hole; 7. Annular spray head; 8. Conical vent hood; 9. Mounting block; 10. Mounting hole; 11. Drain hole; 12. First connecting column; 13. Second connecting column; 14. Slanted downward spray hole; 15. First water inlet hole; 16. Second water inlet hole. Detailed Implementation

[0015] The technical solutions in the embodiments of this utility model will be clearly and completely described below. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0016] Please see Figures 1 to 4 This utility model provides the following two technical solutions: Example 1: The hexamethylenetetramine tail gas ammonia-formaldehyde vapor countercurrent spray recovery device includes a first spray plate 1, a first water pipe 2 symmetrically fixedly connected to one side of the first spray plate 1, a second spray plate 3 fixedly connected to one side of the first water pipe 2, two sets of second water pipes 4 symmetrically fixedly connected to one side of the second spray plate 3, a third spray plate 5 fixedly connected to one side of the second water pipes 4, and two sets of mounting blocks 9 symmetrically fixedly connected to one side of the third spray plate 5. The first spray plate 1, the second spray plate 3, and the third spray plate 5 are provided with air passage holes 6, and an annular spray head 7 is fixedly connected to one side of the air passage holes 6; the first spray plate... 1. Conical vent hoods 8 are fixedly connected to one side of the second spray plate 3, and the conical vent hoods 8 are located on one side of the air passage hole 6; two sets of first connecting columns 12 are symmetrically fixedly connected to one side of the second spray plate 3, and two sets of second connecting columns 13 are symmetrically fixedly connected to the other side of the second spray plate 3. One side of the first connecting column 12 is fixedly connected to the first spray plate 1, and one side of the second connecting column 13 is fixedly connected to the third spray plate 5; drainage holes 11 are provided on one side of the first connecting column 12 and the second connecting column 13; drainage holes 11 are provided in the middle of the mounting block 9, and two sets of mounting holes 10 are symmetrically provided on both sides of the mounting block 9.

[0017] In use, two sets of first connecting columns 12 are symmetrically fixedly connected to one side of the first spray plate 1, and a second spray plate 3 is fixedly connected to the other side of the first connecting column 12. Two sets of second connecting columns 13 are symmetrically fixedly connected to one side of the second spray plate 3, and a third spray plate 5 is fixedly connected to one side of the second connecting column 13. A mounting block 9 with mounting holes 10 is fixedly connected to one side of the third spray plate 5. The three sets of spray plates are fixedly connected to the inner wall of the spray tower through the mounting holes 10. All three spray trays are hollow. The first and second spray trays 3 are connected by two symmetrically arranged first water pipes 2, and the second and third spray trays 3 are connected by two symmetrically arranged second water pipes 4. Each first water pipe 2 has a first water inlet 15, and each second water pipe 4 has a second water inlet 16. During installation, the first and second water inlets 15 and 16 are aligned with the water inlets on the spray tower, respectively. Water is supplied to the three spray trays through multiple inlets to maintain sufficient spray pressure. Multiple sets of air passage holes 6 are staggered on each of the three spray trays. The exhaust gas is sprayed through the air passage holes 6 in sequence, which increases the contact time between the exhaust gas and the spray liquid and increases the absorption efficiency. The spray liquid containing ammonia and formaldehyde can be discharged and collected from the drain holes 11 on the first connecting column 12, the second connecting column 13 and the mounting block 9. During installation, the drain holes 11 should be aligned with the recovery holes on the spray tower. A conical ventilation hood 8 is also fixedly connected above the air passage holes 6 on the first spray plate 1 and the second spray plate 3. The exhaust gas dissolved in the spray liquid is discharged upward from the conical ventilation hood 8. Some of the exhaust gas will come into contact with the inner wall of the conical ventilation hood 8, liquefy into small water droplets, and slide down for collection.

[0018] Example 2: Based on Example 1, the annular spray head 7 is provided with a uniformly arranged oblique spray hole 14 on one side, and the air passage hole 6 is located on the second spray plate 3 and is offset from the one located on the first spray plate 1 and the third spray plate 5.

[0019] In use, an annular spray head 7 with inclined downward spray holes 14 is fixedly connected to the middle of the air passage hole 6. The inclined downward spray holes 14 are evenly arranged in a circumferential direction on the inner wall of the annular spray head 7 to form a swirling effect, enhance gas-liquid turbulence, and increase the contact time between the spray liquid and the passing exhaust gas. Compared with traditional vertical spraying, it can improve the absorption rate of ammonia and formaldehyde. The countercurrent spraying of water with an inclined downward direction improves the absorption and recovery efficiency of ammonia and formaldehyde in the exhaust gas generated during the preparation of hexamethylenetetramine, avoiding insufficient absorption and exhaust gas containing ammonia and formaldehyde that pollutes the air and harms human health.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A countercurrent spraying and recovery device for urotropine tail gas ammonia-formaldehyde vapor, comprising a first spraying disc (1), characterized in that: A first water pipe (2) is symmetrically fixedly connected to one side of the first spray plate (1), a second spray plate (3) is fixedly connected to one side of the first water pipe (2), two sets of second water pipes (4) are symmetrically fixedly connected to one side of the second spray plate (3), a third spray plate (5) is fixedly connected to one side of the second water pipe (4), and two sets of mounting blocks (9) are symmetrically fixedly connected to one side of the third spray plate (5). The first spray plate (1), the second spray plate (3) and the third spray plate (5) are provided with air passage holes (6), and an annular spray head (7) is fixedly connected to one side of the air passage holes (6).

2. The hexamethylenetetramine tail gas ammonia-formaldehyde vapor countercurrent spray recovery device according to claim 1, characterized in that: The first spray plate (1) and the second spray plate (3) are respectively fixedly connected to one side of a conical ventilator (8), and the conical ventilator (8) is located on one side of the air passage hole (6).

3. The hexamethylenetetramine tail gas ammonia-formaldehyde vapor countercurrent spray recovery device according to claim 1, characterized in that: Two sets of first connecting columns (12) are symmetrically fixedly connected to one side of the second spray plate (3), and two sets of second connecting columns (13) are symmetrically fixedly connected to the other side of the second spray plate (3). One side of the first connecting column (12) is fixedly connected to the first spray plate (1), and one side of the second connecting column (13) is fixedly connected to the third spray plate (5).

4. The hexamethylenetetramine tail gas ammonia-formaldehyde vapor countercurrent spray recovery device according to claim 3, characterized in that: Drainage holes (11) are provided on one side of the first connecting column (12) and the second connecting column (13).

5. The hexamethylenetetramine tail gas ammonia-formaldehyde vapor countercurrent spray recovery device according to claim 1, characterized in that: The mounting block (9) has a drainage hole (11) in the middle and two sets of mounting holes (10) are symmetrically arranged on both sides of the mounting block (9).

6. The hexamethylenetetramine tail gas ammonia-formaldehyde vapor countercurrent spray recovery device according to claim 1, characterized in that: The annular spray head (7) has oblique downward spray holes (14) evenly distributed on one side.

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