Acid mist treatment system of nitric acid storage tank

Abstract

The utility model relates to an acid mist treatment system of a nitric acid storage tank, which aims to solve the technical problem that the acid mist treatment efficiency is reduced due to the change of the pH value of alkali liquor, and adopts the technical scheme that the acid mist treatment system comprises an alkali liquor pool, a spray tower, a gas inlet pipe and a liquid discharge pipe, the spray tower is arranged in the alkali liquor pool, the gas inlet pipe leads to the bottom of the spray tower, and the liquid discharge pipe is arranged at the bottom of the side wall of the alkali liquor pool; the alkali liquor pipe leads to an inlet of the alkali liquor pool, the electromagnetic valve is arranged on the alkali liquor pipe, one end of the circulating pipe leads to the inner bottom of the alkali liquor pool, the other end of the circulating pipe is connected to the upper portion of the spraying tower, the circulating pump is connected to the circulating pipe, the spraying coil is arranged on the upper portion of the spraying tower, and the PH meter is arranged on the spraying coil. The spraying coil pipe is connected with the upper end of the circulating pipe, the PH meter is arranged on the inner side wall of the alkali liquor pool, and the control system is electrically connected with the electromagnetic valve, the circulating pump and the PH meter. Linkage control of alkali liquor adjustment can be achieved, manual operation is not needed, and production efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of nitric acid mist treatment equipment, specifically relating to an acid mist treatment system for a nitric acid storage tank. Background Technology

[0002] During the production of nitric acid, a large amount of acid mist is generated in the nitric acid storage tank. The acid mist enters the spray tower through pipelines for alkaline spraying treatment. After a period of circulation and neutralization reaction in the alkaline solution tank, the pH value of the alkaline solution changes, reducing the efficiency of acid mist treatment. In the later stage, the alkaline solution needs to be manually added and replaced, which not only results in low production efficiency, but also poses a safety hazard to the workers. Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned problems and provide an acid mist treatment system for nitric acid storage tanks.

[0004] To solve this technical problem, the technical solution adopted by this utility model is as follows:

[0005] An acid mist treatment system for a nitric acid storage tank includes an alkaline tank, a spray tower, an air inlet pipe, and a drain pipe. The bottom of the spray tower is submerged in the alkaline tank, the air inlet pipe leads to the bottom of the spray tower, the top of the spray tower is connected to a chimney, and the drain pipe is located at the bottom of the side wall of the alkaline tank and leads to a reaction tank.

[0006] It also includes an alkali pipe, a first solenoid valve, a circulation pipe, a circulation pump, a spray coil, a pH meter, and a control system. One end of the alkali pipe leads to the alkali source, and the other end leads to the inlet of the alkali tank. The first solenoid valve is installed on the alkali pipe. One end of the circulation pipe leads to the bottom of the alkali tank, and the other end is connected to the upper part of the spray tower. The circulation pump is connected to the circulation pipe and placed on the edge of the alkali tank. The spray coil is installed on the upper part of the spray tower and is connected to the upper end of the circulation pipe. The pH meter is installed on the inner wall of the alkali tank and is located below the alkali liquid level.

[0007] The control system is electrically connected to the first solenoid valve, the circulating pump, and the pH meter, respectively.

[0008] Furthermore, the bottom center of the spray coil is symmetrically provided with several spray nozzles.

[0009] Furthermore, a spray head is provided inside the spray nozzle.

[0010] Furthermore, the spray tower is equipped with packing material.

[0011] Furthermore, the alkaline solution is lime water.

[0012] Furthermore, the pH value of the alkaline solution in the alkaline solution tank is controlled within the range of 6.0-8.0.

[0013] Furthermore, a level gauge is provided on the inner wall of the alkali tank, and a second solenoid valve is provided on the drain pipe. Both the level gauge and the second solenoid valve are electrically connected to the control system.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model enables the linkage control of alkali solution adjustment by setting up a pH meter and a first solenoid valve, eliminating the need for manual operation and improving production efficiency;

[0016] 2. The spray nozzle of this utility model is equipped with a spray head, which can make the alkaline solution spray more evenly and the treatment effect on acid mist better.

[0017] 3. This utility model can achieve fully automatic control, reduce the number of operators, lower costs, and at the same time prevent accidents from happening to operators;

[0018] 4. This utility model has a simple structure, low cost, strong practicality, and is suitable for widespread promotion. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the coil structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of the coil of this utility model;

[0022] In the diagram: 1. Alkali solution tank; 2. Spray tower; 3. Chimney; 4. Air inlet pipe; 5. Drain pipe; 6. Alkali solution pipe; 7. First solenoid valve; 8. Circulation pipe; 9. Circulation pump; 10. Spray coil; 11. Spray nozzle; 12. pH meter; 13. Second solenoid valve. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] like Figure 1-3 As shown, an acid mist treatment system for a nitric acid storage tank includes an alkaline tank 1, a spray tower 2, an air inlet pipe 4, and a drain pipe 5. The spray tower 2 is uniformly filled with packing material and its bottom is submerged in the alkaline tank 1. The alkaline solution in the alkaline tank 1 is lime water. A level gauge is installed on the inner side wall of the alkaline tank 1. The air inlet pipe 4 leads to the bottom of the spray tower 2. The top of the spray tower 2 is connected to a chimney 3. The drain pipe 5 is located at the bottom of the side wall of the alkaline tank 1 and leads to the reaction tank. A second solenoid valve 13 is installed on the drain pipe 5.

[0025] It also includes an alkali pipe 6, a first solenoid valve 7, a circulation pipe 8, a circulation pump 9, a spray coil 10, a pH meter 12, and a control system. One end of the alkali pipe 6 is connected to the alkali source, and the other end is connected to the inlet of the alkali tank 1. The first solenoid valve 7 is installed on the alkali pipe 6. One end of the circulation pipe 8 is connected to the bottom of the alkali tank 1, and the other end is connected to the upper part of the spray tower 2. The circulation pump 9 is connected to the circulation pipe 8 and placed on the edge of the alkali tank 1. The spray coil 10 is installed on the upper part of the spray tower 2 and is connected to the upper end of the circulation pipe 8. Several spray nozzles 11 are evenly and symmetrically opened on both sides of the bottom middle of the spray coil 10. Spray heads are installed in the spray nozzles 11. The pH meter 12 is installed on the inner wall of the alkali tank 1 and is located below the alkali liquid surface. The pH value of the pH meter 12 is set to 7.0.

[0026] The control system is electrically connected to the first solenoid valve 7, the circulating pump 9, the pH meter 12, the level gauge, and the second solenoid valve 13.

[0027] The pH value of the alkaline solution in the alkaline solution tank 1 can also be any value between 6.0 and 8.0.

[0028] The working process of this utility model is as follows:

[0029] When this utility model is in use, the circulation pump 9 is turned on by the control system, the alkaline solution rises along the circulation pipe 8 and enters the spray coil 10, and is sprayed out from the spray port 11. The acid mist generated in the nitric acid storage tank enters the spray tower 2 along the air inlet pipe 4 and rises. During the rise, it encounters the alkaline solution sprayed down and undergoes a neutralization reaction. The alkaline solution after the neutralization reaction falls back into the alkaline solution pool 1 to form a cycle. The gas after the reaction meets the emission standards and is discharged into the chimney 3 along the emission pipe. The pH meter 12 detects the pH value of the alkaline solution in real time and displays it in real time through the display module set up next to it.

[0030] After a period of neutralization reaction, the pH value of the alkali solution in alkali solution tank 1 decreases. When pH meter 12 detects that the pH value of the alkali solution has dropped below 6.0, the control system controls the first solenoid valve 7 to open, and new alkali solution is discharged into alkali solution tank 1 along the alkali solution pipe to adjust the pH value of the alkali solution. When pH meter 12 detects that the pH value of the alkali solution is higher than 8.0, it controls the first solenoid valve 7 to close, stopping the addition of alkali solution.

[0031] When the liquid level in the alkali tank 1 exceeds the preset warning line of the level gauge, the second solenoid valve 13 is opened by the control system to discharge the alkali into the reaction tank until the alkali level drops below the warning line, at which point the second solenoid valve 13 closes.

Claims

1. An acid mist treatment system for nitric acid storage tank, comprising a lye pool (1), a spray tower (2), an air inlet pipe (4) and a liquid outlet pipe (5), the bottom of the spray tower (2) is immersed in the lye pool (1), the air inlet pipe (4) leads to the bottom of the spray tower (2), the top of the spray tower (2) is connected to a chimney (3), and the liquid outlet pipe (5) is arranged at the bottom of the side wall of the lye pool (1) and leads to a reaction tank. characterized in that Further comprising a lye pipe (6), a first electromagnetic valve (7), a circulation pipe (8), a circulation pump (9), a spray coil (10), a pH meter (12) and a control system, one end of the lye pipe (6) leads to a lye source, and the other end leads to the inlet of the lye pool (1), the first electromagnetic valve (7) is arranged on the lye pipe (6), one end of the circulation pipe (8) leads to the bottom of the lye pool (1), and the other end is connected to the upper part of the spray tower (2), the circulation pump (9) is connected to the circulation pipe (8) and placed on the edge of the lye pool (1), the spray coil (10) is arranged on the upper part of the spray tower (2), and the spray coil (10) is connected to the upper end of the circulation pipe (8), the pH meter (12) is arranged on the inner side wall of the lye pool (1) and below the lye liquid level; The control system is electrically connected with the first electromagnetic valve (7), the circulation pump (9) and the pH meter (12) respectively.

2. An acid mist treatment system for a nitric acid storage tank according to claim 1, characterized in that, A plurality of spray nozzles (11) are evenly and symmetrically arranged in the middle of the bottom of the spray coil (10).

3. An acid mist treatment system for a nitric acid storage tank according to claim 2, wherein A spray head is arranged in the spray nozzle (11).

4. The acid mist treatment system for nitric acid storage tank according to claim 1, characterized by A filler is arranged in the spray tower (2).

5. The acid mist treatment system for nitric acid storage tank according to claim 1, wherein The lye is lime water.

6. The acid mist treatment system for nitric acid storage tank according to claim 1, wherein The PH value of the lye in the lye pool (1) is controlled to be between 6.0 and 8.

0.

7. The acid mist treatment system for nitric acid storage tank according to claim 1, wherein A liquid level meter is arranged on the inner side wall of the lye pool (1), a second electromagnetic valve (13) is arranged on the liquid outlet pipe (5), and the liquid level meter and the second electromagnetic valve (13) are electrically connected with the control system.

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