Acid mist treatment device for sulfuric acid production equipment

Abstract

The utility model provides an acid mist treatment device for sulfuric acid production equipment, which comprises an ammonia washing tower and an exhaust fan, the sulfuric acid production equipment comprises a drying tower and a dry absorption circulating tank, the dry absorption circulating tank is communicated with the bottom end of the drying tower through an inflow pipe, and the upper end of the drying tower is communicated with the dry absorption circulating tank through a return pipe. The dry suction circulating tank is further communicated with the input end of the exhaust fan through a first air suction pipe, the output end of the exhaust fan is communicated with the ammonia washing tower through a first exhaust pipe, and the bottom end of the ammonia washing tower is further connected with an ammonia washing circulating tank. By adopting the technical scheme, acid mist generated in the sulfuric acid production process is respectively absorbed by the first air suction pipe and the second air suction pipe and then is fed into the ammonia washing tower, and the acid mist and ammonia water in the ammonia washing tower are subjected to chemical reaction to generate an ammonium sulfate solution, so that the acid mist is prevented from being directly discharged into the atmosphere, and the environmental pollution caused by the acid mist is avoided; the harm of the acid mist to the body health of workers in a production workshop is also avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of sulfuric acid production equipment, in particular to an acid mist treatment device for sulfuric acid production equipment. Background Art

[0002] Large-scale sulfuric acid production facilities typically include a drying tower and a dry absorption circulation tank. The drying tower is a device that simultaneously dries and removes harmful gases, based on the solubility of gases in liquids. As moisture passes through the drying tower, it comes into contact with the liquid on the filler surface, gradually losing moisture there, achieving the drying effect. The dry absorption circulation tank collects the gas passing through the drying tower and returns it to the drying tower for further drying, thereby improving the drying effect.

[0003] For example, the patent document with publication number "CN220454375U" discloses a low-temperature waste heat recovery device for sulfuric acid production using sulfur or pyrite. This utility model includes: a sulfuric acid circulation absorption pipeline including: a heat recovery tower having a liquid accumulation section, a high-temperature section, a low-temperature section, and a demisting section; a circulation tank connected to the liquid accumulation section; an evaporator connected to the circulation tank; the evaporator is respectively connected to a diluter and a deoxygenated water heater, wherein the diluter is connected to the high-temperature section; a desalted water preheater is connected to the deoxygenated water heater, and the desalted water preheater is connected to the dry absorption circulation tank; a desalted water production low-pressure steam pipeline including: a desalted water station provides desalted water to the desalted water preheater; a deaerator is connected to the deoxygenated water preheater, and the deoxygenated water at the deaerator outlet is divided into two paths, one path enters the deoxygenated water heater, and then enters the evaporator from the deoxygenated water heater to form low-pressure steam in the evaporator; the other path enters the diluter. This patented technical solution solves the technical problem of insufficient low-temperature waste heat recovery efficiency in the existing sulfuric acid production process. However, during the sulfuric acid production process, sulfuric acid always circulates between the drying tower and the circulation tank. Some of the sulfuric acid will come into contact with the air to form acid mist, which will escape through the gaps around the circulation tank, not only polluting the environment but also endangering the health of workshop production workers. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides an acid mist treatment device for sulfuric acid production equipment.

[0005] The utility model is achieved through the following technical solutions.

[0006] The utility model provides an acid mist treatment device for sulfuric acid production equipment, comprising an ammonia washing tower and an exhaust fan, wherein the sulfuric acid production equipment comprises a drying tower and a dry suction circulation tank, wherein the dry suction circulation tank is connected to the bottom end of the drying tower via an inlet pipe, the upper end of the drying tower is also connected to the dry suction circulation tank via a reflux pipe, the dry suction circulation tank is also connected to the input end of the exhaust fan via a first air intake pipe, the output end of the exhaust fan is connected to the ammonia washing tower via a first exhaust pipe, and the bottom end of the ammonia washing tower is also connected to the ammonia washing circulation tank.

[0007] The sulfuric acid production equipment further includes an air inlet fan, which is connected to the lower end of the drying tower through an air inlet pipe.

[0008] The sulfuric acid production equipment also includes a second absorption tower, a second absorption circulation tank, a second absorption pipe and a second exhaust pipe. The inlet pipe is also connected between the second absorption circulation tank and the bottom end of the second absorption tower, and the reflux pipe is also connected between the second absorption circulation tank and the upper end of the second absorption tower. The second absorption circulation tank and the dry absorption circulation tank are also connected through a connecting pipe. One end of the second absorption pipe extends into the second absorption circulation tank, and the other end of the second absorption pipe is connected in parallel with the first absorption pipe. One end of the second exhaust pipe is connected to the upper end of the second absorption tower, and the other end of the second exhaust pipe is connected in parallel with the first exhaust pipe.

[0009] A gate valve is also installed on the inlet pipe.

[0010] The outer diameter of the first intake pipe or the second intake pipe is not less than 80 mm.

[0011] The outer diameter of the first exhaust pipe or the second exhaust pipe is not less than 100 mm.

[0012] The outer diameter of the connecting pipe is not less than 80 mm.

[0013] The middle portion of the first exhaust pipe or the second exhaust pipe is bent at least three times.

[0014] The beneficial effect of the utility model is that: by adopting the technical solution of the utility model, the acid mist generated in the sulfuric acid production process is absorbed by the first suction pipe and the second suction pipe respectively and then sent to the ammonia washing tower, the acid mist reacts chemically with the ammonia water with a concentration of less than 8% in the ammonia washing tower to generate ammonium sulfate solution, and the ammonium sulfate solution is collected by the ammonia washing circulation tank, thereby avoiding the acid mist from being directly discharged into the atmosphere, avoiding the acid mist from polluting the environment, and avoiding the acid mist from causing harm to the health of workers in the production workshop. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the present utility model.

[0016] In the figure: 1- ammonia washing tower, 2- exhaust fan, 3- drying tower, 4- dry suction circulation tank, 5- inlet pipe, 6- reflux pipe, 7- first suction pipe, 8- first exhaust pipe, 9- ammonia washing circulation tank, 10- inlet fan, 11- inlet pipe, 12- second suction tower, 13- second suction circulation tank, 14- second suction pipe, 15- second exhaust pipe, 16- connecting pipe, 17- gate valve. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the described solution.

[0018] like Figure 1 As shown, the utility model provides an acid mist treatment device for sulfuric acid production equipment, including an ammonia washing tower 1 and an exhaust fan 2. The sulfuric acid production equipment includes a drying tower 3 and a dry absorption circulation tank 4. The dry absorption circulation tank 4 is connected to the bottom end of the drying tower 3 through an inlet pipe 5, and the upper end of the drying tower 3 is also connected to the dry absorption circulation tank 4 through a reflux pipe 6. The dry absorption circulation tank 4 is also connected to the input end of the exhaust fan 2 through a first intake pipe 7. The output end of the exhaust fan 2 is connected to the ammonia washing tower 1 through a first exhaust pipe 8. The bottom end of the ammonia washing tower 1 is also connected to an ammonia washing circulation tank 9.

[0019] By adopting the technical solution of the utility model, acid mist generated in the sulfuric acid production process is absorbed by the first suction pipe and the second suction pipe respectively and then sent to the ammonia scrubber. The acid mist reacts chemically with ammonia water with a concentration of less than 8% in the ammonia scrubber to generate ammonium sulfate solution, which is collected by the ammonia scrubbing circulation tank. This avoids the acid mist from being directly discharged into the atmosphere, thus avoiding environmental pollution caused by the acid mist and also avoiding harm to the health of workers in the production workshop caused by the acid mist.

[0020] Specifically, the sulfuric acid production equipment also includes an air inlet fan 10, which is connected to the lower end of the drying tower 3 via an air inlet pipe 11. The sulfuric acid production equipment also includes a second absorption tower 12, a second absorption circulation tank 13, a second suction pipe 14, and a second exhaust pipe 15. The inlet pipe 5 is also connected between the second absorption circulation tank 13 and the bottom end of the second absorption tower 12, the reflux pipe 6 is also connected between the second absorption circulation tank 13 and the upper end of the second absorption tower 12, and the second absorption circulation tank 13 and the dry absorption circulation tank 4 are also connected via a connecting pipe 16. One end of the second absorption pipe 14 extends into the second absorption circulation tank 13, and the other end of the second absorption pipe 14 is connected in parallel with the first absorption pipe 7. One end of the second exhaust pipe 15 is connected to the upper end of the second absorption tower 12, and the other end of the second exhaust pipe 15 is connected in parallel with the first exhaust pipe 8.

[0021] Adopting the technical solution of the present invention, setting the drying tower 3, the dry absorption circulation tank 4, the secondary absorption tower 12, and the secondary absorption circulation tank 13 is beneficial to further improving the sulfuric acid drying treatment effect, wherein the probability of acid mist being generated in the dry absorption circulation tank 4, the secondary absorption tower 12, and the secondary absorption circulation tank 13 can reach more than 90%, and the acid mist is collected and processed through the first suction pipe 7 and the second suction pipe 14 respectively, so as to completely eliminate the harm caused by the acid mist.

[0022] In addition, a gate valve 17 is installed on the inlet pipe 5. The outer diameter of the first intake pipe 7 or the second intake pipe 14 is not less than 80 mm. The outer diameter of the first exhaust pipe 8 or the second exhaust pipe 15 is not less than 100 mm. The outer diameter of the cross-linking pipe 16 is not less than 80 mm. The first intake pipe 7, the second intake pipe 14, the first intake pipe 7, the second intake pipe 14 and the cross-linking pipe 16 are all made of 316L stainless steel. The middle part of the first exhaust pipe 8 or the second exhaust pipe 15 is bent at least three times. As the acid mist flows in the pipe, the gas gradually decreases, which is conducive to the acid mist to fully react chemically with the ammonia solution in the ammonia scrubber.

Claims

1. An acid mist treatment device for sulfuric acid production equipment, characterized in that: The invention comprises an ammonia washing tower (1) and an exhaust fan (2), wherein the sulfuric acid production equipment comprises a drying tower (3) and a dry absorption circulation tank (4), wherein the dry absorption circulation tank (4) is connected to the bottom end of the drying tower (3) via an inlet pipe (5), and the upper end of the drying tower (3) is also connected to the dry absorption circulation tank (4) via a reflux pipe (6). The dry absorption circulation tank (4) is also connected to the input end of the exhaust fan (2) via a first air intake pipe (7), and the output end of the exhaust fan (2) is connected to the ammonia washing tower (1) via a first exhaust pipe (8). The bottom end of the ammonia washing tower (1) is also connected to the ammonia washing circulation tank (9).

2. The acid mist treatment device for sulfuric acid production equipment according to claim 1, characterized in that: The sulfuric acid production equipment further comprises an air inlet fan (10), and the air inlet fan (10) is connected to the lower end of the drying tower (3) via an air inlet pipe (11).

3. The acid mist treatment device for sulfuric acid production equipment according to claim 1, characterized in that: The sulfuric acid production equipment further comprises a second suction tower (12), a second suction circulation tank (13), a second suction pipe (14) and a second exhaust pipe (15); the inlet pipe (5) is further connected between the second suction circulation tank (13) and the bottom end of the second suction tower (12); the reflux pipe (6) is further connected between the second suction circulation tank (13) and the upper end of the second suction tower (12); the second suction circulation tank (13) and the dry suction circulation tank (4) are further connected via a connecting pipe (16); one end of the second suction pipe (14) extends into the second suction circulation tank (13); the other end of the second suction pipe (14) is connected in parallel with the first suction pipe (7); one end of the second exhaust pipe (15) is connected to the upper end of the second suction tower (12); and the other end of the second exhaust pipe (15) is connected in parallel with the first exhaust pipe (8).

4. The acid mist treatment device for sulfuric acid production equipment according to claim 1 or 3, characterized in that: A gate valve (17) is also installed on the inlet pipe (5).

5. The acid mist treatment device for sulfuric acid production equipment according to claim 3, characterized in that: The outer diameter of the first air intake pipe (7) or the second air intake pipe (14) is not less than 80 mm.

6. The acid mist treatment device for sulfuric acid production equipment according to claim 3, characterized in that: The outer diameter of the first exhaust pipe (8) or the second exhaust pipe (15) is not less than 100 mm.

7. The acid mist treatment device for sulfuric acid production equipment according to claim 3, characterized in that: The outer diameter of the connecting pipe (16) is not less than 80 mm.

8. The acid mist treatment device for sulfuric acid production equipment according to claim 3, characterized in that: The middle portion of the first exhaust pipe (8) or the second exhaust pipe (15) is bent at least three times.

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