High efficiency automatic acid removal water washing system

Abstract

The utility model relates to the technical field of waste gas treatment, concretely to high -efficient automatic acid -removing water washing system. System includes primary water washing tower, secondary water washing tower, spray pump and pipeline etc., and the top of primary water washing tower is connected with secondary water washing tower through the pipeline, and the primary water washing tower is connected with acid -containing tail gas inlet pipeline, and the bottom of primary water washing tower is connected with primary water washing tower spray pump through the pipeline, and primary water washing tower spray pump is connected with the top of primary water washing tower through the pipeline. The primary water washing tower is equipped with primary water washing tower liquid level detector and primary water washing tower concentration analysis instrument, and the primary water washing tower liquid level detector is connected with PLC control system, and the secondary water washing tower is equipped with secondary water washing tower liquid level detector and secondary water washing tower concentration analysis instrument, and the liquid level detector is connected with PLC control system. The system linkage through PLC control system and each liquid level detector, concentration analysis instrument, cut -off valve and pump body has realized the automatic control of hydrogen fluoride acid -containing tail gas treatment whole process.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, specifically to a high-efficiency automatic acid removal and washing system. Background Technology

[0002] Hydrofluoric acid (HF) exhaust gas is an extremely hazardous waste gas in industrial production processes. HF is highly corrosive and toxic; if its exhaust gas is discharged directly without proper treatment, it will not only severely corrode production equipment and pipelines, shortening their lifespan, but also pose a significant threat to the health of operators and cause serious pollution to the surrounding environment, disrupting the ecological balance. Therefore, effective treatment of HF exhaust gas is an indispensable and crucial step in industrial production.

[0003] Existing hydrofluoric acid tail gas treatment devices in workshop production suffer from numerous problems: Firstly, their automation level is extremely low. The entire treatment process, from monitoring tail gas treatment parameters and controlling equipment start-up and shutdown to acid discharge and replenishment, requires extensive manual intervention. Operators must constantly monitor equipment operation, manually record data, and manually operate valves and pumps. This not only results in high labor intensity but also increases the risk of unstable treatment effects due to human error, potentially even leading to safety accidents. Secondly, existing devices mostly employ a single water scrubbing tower for tail gas treatment, resulting in low efficiency and difficulty in meeting the treatment requirements of high-concentration hydrofluoric acid tail gas. More importantly, when the single water scrubbing tower is used for acid discharge, the spray system must be shut down. At this time, the tail gas cannot be effectively treated, and untreated hydrofluoric acid tail gas is directly discharged, posing serious environmental risks and safety hazards. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a highly efficient automatic acid removal and washing system. Through the linkage of a PLC control system with various level detectors, concentration analyzers, shut-off valves, and pumps, the entire process of treating hydrofluoric acid tail gas is automated. This eliminates the need for manual operation of valves, pumps, and parameter monitoring, significantly reducing labor intensity, minimizing human error, and improving system stability and reliability.

[0005] This utility model is achieved using the following technical solution:

[0006] The aforementioned high-efficiency automatic acid removal water washing system includes a primary water washing tower. The top of the primary water washing tower is connected to the secondary water washing tower via a tail gas inlet pipe. An acid-containing tail gas inlet pipe is connected to the primary water washing tower. The bottom of the primary water washing tower is connected to the primary water washing tower spray pump via a pipe. The primary water washing tower spray pump is connected to the top of the primary water washing tower via a primary water washing tower spray pipe. The primary water washing tower is equipped with a primary water washing tower level detector and a primary water washing tower concentration analyzer. A PLC control system is connected to the primary water washing tower level detector.

[0007] The primary water scrubbing tower monitors the liquid level in real time using a level detector, and the concentration analyzer precisely controls the acid concentration to ensure the initial treatment effect of the exhaust gas and lay the foundation for subsequent secondary treatment. The secondary water scrubbing tower achieves deep treatment of the exhaust gas and forms a series treatment process with the primary water scrubbing tower to improve the exhaust gas treatment efficiency. The level detector and water supply pipeline work together to maintain a stable liquid level in the tower in real time, ensuring continuous treatment.

[0008] The bottom of the secondary water washing tower is connected to the secondary water washing tower spray pump via a pipeline, and the secondary water washing tower spray pump is connected to the top of the secondary water washing tower via the secondary water washing tower spray pipe. A PLC primary signal line is provided between the primary water washing tower level detector and the PLC control system.

[0009] The secondary water washing tower is equipped with a secondary water washing tower level detector and a secondary water washing tower concentration analyzer. A water supply pipe is connected to the secondary water washing tower. The secondary water washing tower level detector is connected to the PLC control system through a PLC secondary signal line.

[0010] An auxiliary pipe and a connecting pipe are connected between the spray pipe of the primary water washing tower and the spray pipe of the secondary water washing tower. A standby pump is connected to the auxiliary pipe. The standby pump is connected to the bottom of the primary water washing tower through a pipe and to the secondary water washing tower through a pipe.

[0011] The primary water washing tower spray pipe is connected to a hydrofluoric acid recovery pipe, and the top of the secondary water washing tower is connected to an outlet pipe. After the concentration in the primary water washing tower reaches the standard, the hydrofluoric acid recovery pipe controls the acid liquid to enter the recovery pipe through an acid shut-off valve, realizing the resource recovery of hydrofluoric acid, reducing raw material waste and environmental treatment costs.

[0012] The hydrofluoric acid recovery pipeline is equipped with a primary water washing tower acid shut-off valve, a primary water washing tower spray shut-off valve, a connecting pipeline shut-off valve, a secondary water washing tower spray shut-off valve, and a secondary water washing tower water supply shut-off valve.

[0013] The PLC control system is connected to the acid shut-off valve of the primary water washing tower, the spray shut-off valve of the primary water washing tower, the connecting pipeline shut-off valve, the spray shut-off valve of the secondary water washing tower, and the water replenishment shut-off valve of the secondary water washing tower.

[0014] The working principle of this utility model is as follows:

[0015] Hydrofluoric acid-containing tail gas enters the primary water scrubbing tower via the acid-containing tail gas inlet pipeline. Simultaneously, the primary water scrubbing tower spray pump is activated, and the primary water scrubbing tower spray shut-off valve is opened. The scrubbing liquid within the primary water scrubbing tower is transported to the top of the tower via the primary water scrubbing tower spray pipeline for preliminary scrubbing of the tail gas. The tail gas treated in the primary water scrubbing tower then enters the secondary water scrubbing tower via the tail gas inlet pipeline. The secondary water scrubbing tower spray pump is activated, and the secondary water scrubbing tower spray shut-off valve is opened. The scrubbing liquid within the secondary water scrubbing tower is transported to the top of the tower via the secondary water scrubbing tower spray pipeline for deep scrubbing of the tail gas. The tail gas treated in the secondary water scrubbing tower is discharged through the outlet pipeline. When the concentration analyzer in the primary water scrubbing tower detects that the concentration has reached the set value, it sends a signal to the PLC control system. The PLC control system instructs the primary water scrubbing tower acid shut-off valve to open and the primary water scrubbing tower spray shut-off valve to close, initiating the recovery of the acid solution within the primary water scrubbing tower through the hydrofluoric acid recovery pipeline. When the level detector in the primary water scrubbing tower detects a drop in the liquid level to 20cm, it sends a signal to the PLC control system. The PLC control system then instructs the primary water scrubbing tower spray pump to stop operating. After the primary water scrubbing tower spray pump stops operating, the PLC control system instructs the primary water scrubbing tower acid shut-off valve to close and the primary water scrubbing tower spray shut-off valve to open. The PLC control system then instructs the secondary water scrubbing tower to open the shut-off valve connected in series with the primary water scrubbing tower (i.e., the connecting pipeline shut-off valve) and close the secondary water scrubbing tower spray shut-off valve. Real-time liquid level monitoring is maintained. When the primary water scrubbing tower liquid level is greater than 75cm or the secondary water scrubbing tower liquid level is less than 20cm, the PLC control system automatically closes the connecting pipeline shut-off valve. The PLC control system then instructs the primary water scrubbing tower spray pump to start and opens the secondary water scrubbing tower spray shut-off valve and the secondary water scrubbing tower water supply shut-off valve. When the secondary water scrubbing tower level detector detects a rise in the liquid level to 75cm, the PLC control system instructs the secondary water scrubbing tower water supply shut-off valve to close. When the primary or secondary water scrubbing tower spray pump malfunctions, the PLC control system issues an alarm signal and automatically starts the backup pump. The washing liquid is then transported through the auxiliary pipeline to ensure the normal operation of the spray system, and maintenance personnel can promptly repair the faulty pump.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] (1) The entire process of treating hydrofluoric acid tail gas is automated by linking the PLC control system with each liquid level detector, concentration analyzer, shut-off valve and pump. There is no need for manual operation of valve start and stop, pump operation and parameter monitoring, which greatly reduces the intensity of manual labor, reduces human operation errors and improves the stability and reliability of system operation.

[0018] (2) A two-stage series treatment is adopted, with a primary water washing tower and a secondary water washing tower set up for series treatment. The hydrofluoric acid tail gas is first pre-treated by the primary water washing tower and then enters the secondary water washing tower for deep treatment, which significantly improves the tail gas treatment efficiency and can effectively meet the treatment needs of high-concentration hydrofluoric acid tail gas, ensuring that the tail gas meets the emission standards.

[0019] (3) When acid discharge is carried out in the primary water washing tower, the shut-off valve of the primary water washing tower connected in series with the secondary water washing tower is opened through the linkage operation of the secondary water washing tower, so that the tail gas treatment can be carried out continuously, avoiding the problem that the tail gas cannot be treated when acid is discharged from a single water washing tower, and eliminating environmental risks and safety hazards.

[0020] (4) After the liquid phase in the primary water washing tower is removed, the liquid phase in the secondary water washing tower is replenished into the primary water washing tower by controlling the shut-off valve of the connecting pipeline. At the same time, the secondary water washing tower is replenished with water in a timely manner through the water replenishment pipeline, forming a liquid phase circulation replenishment mechanism to ensure the stability of the liquid levels in the primary and secondary water washing towers and avoid system operation interruption due to liquid phase replacement.

[0021] (5) By setting up hydrofluoric acid recovery pipelines, hydrofluoric acid can be effectively recovered, improving resource utilization and reducing production costs. At the same time, the setting of auxiliary pipelines and backup pumps can be switched in time when the main pump fails, ensuring continuous and stable operation of the system and reducing production interruptions caused by equipment failure. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the high-efficiency automatic acid removal and washing system of this utility model;

[0023] In the diagram: 1. Primary water scrubbing tower; 2. Secondary water scrubbing tower; 3. Acid-containing tail gas inlet pipe; 4. Primary water scrubbing tower spray pump; 5. Standby pump; 6. Secondary water scrubbing tower spray pump; 7. Primary water scrubbing tower spray pipe; 8. Hydrofluoric acid recovery pipe; 9. Secondary water scrubbing tower spray pipe; 10. Auxiliary pipe; 11. Connecting pipe; 12. Tail gas inlet pipe to secondary water scrubbing tower; 13. Outlet pipe; 14. Makeup water pipe; 15. Primary water scrubbing tower level detector; 16. Secondary water scrubbing tower level detector; 17. PLC primary signal line; 18. PLC secondary signal line; 19. PLC control system; 20. Primary water scrubbing tower acid shut-off valve; 21. Primary water scrubbing tower spray shut-off valve; 22. Connecting pipe shut-off valve; 23. Secondary water scrubbing tower spray shut-off valve; 24. Secondary water scrubbing tower makeup water shut-off valve; 25. Primary water scrubbing tower concentration analyzer; 26. Secondary water scrubbing tower concentration analyzer. Detailed Implementation

[0024] To make the objectives and technical solutions of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0025] Example 1

[0026] like Figure 1As shown, the high-efficiency automatic acid removal and washing system includes a primary washing tower 1. The top of the primary washing tower 1 is connected to the secondary washing tower 2 via a tail gas inlet pipe 12. An acid-containing tail gas inlet pipe 3 is connected to the primary washing tower 1. The bottom of the primary washing tower 1 is connected to a primary washing tower spray pump 4 via a pipe. The primary washing tower spray pump 4 is connected to the top of the primary washing tower 1 via a primary washing tower spray pipe 7. The primary washing tower 1 is equipped with a primary washing tower level detector 15 and a primary washing tower concentration analyzer 25. A PLC control system 19 is connected to the primary washing tower level detector 15. The PLC control system 19, as the system control core, receives detection signals, performs logic operations, and outputs control commands to achieve full-process automation, coordinate the operation of various devices, and reduce the need for manual intervention. The bottom of the secondary water washing tower 2 is connected to the secondary water washing tower spray pump 6 via a pipe. The secondary water washing tower spray pump 6 is connected to the top of the secondary water washing tower 2 via the secondary water washing tower spray pipe 9. A PLC primary signal line 17 is provided between the primary water washing tower level detector 15 and the PLC control system 19. The secondary water washing tower 2 is equipped with a secondary water washing tower level detector 16 and a secondary water washing tower concentration analyzer 26. A water replenishment pipe 14 is connected to the secondary water washing tower 2. The secondary water washing tower level detector 16 is connected to the PLC control system 19 via the PLC secondary signal line 18. An auxiliary pipe 10 and a connecting pipe 11 are connected between the primary water washing tower spray pipe 7 and the secondary water washing tower spray pipe 9. A standby pump 5 is connected to the auxiliary pipe 10. The standby pump 5 is connected to the bottom of the primary water washing tower 1 via a pipe, and the standby pump 5 is connected to the secondary water washing tower 2 via a pipe. A hydrofluoric acid recovery pipe 8 is connected to the primary water washing tower spray pipe 7, and an outlet pipe 13 is connected to the top of the secondary water washing tower 2. A primary water washing tower acid shut-off valve 20 is installed on the hydrofluoric acid recovery pipeline 8; a primary water washing tower spray shut-off valve 21 is installed on the primary water washing tower spray pipeline 7; a connecting pipeline shut-off valve 22 is installed on the connecting pipeline 11; a secondary water washing tower spray shut-off valve 23 is installed on the secondary water washing tower spray pipeline 9; and a secondary water washing tower water supply shut-off valve 24 is installed on the water supply pipeline 14. A PLC control system 19 is connected to the primary water washing tower acid shut-off valve 20, the primary water washing tower spray shut-off valve 21, the connecting pipeline shut-off valve 22, the secondary water washing tower spray shut-off valve 23, the secondary water washing tower water supply shut-off valve 24, the primary water washing tower concentration analyzer 25, and the secondary water washing tower concentration analyzer 26.

[0027] The above-mentioned high-efficiency automatic acid removal washing system includes the following steps during operation:

[0028] (1) Hydrofluoric acid tail gas enters the first-stage water scrubbing tower 1 through the acid tail gas inlet pipe 3. At the same time, the first-stage water scrubbing tower spray pump 4 is started and the first-stage water scrubbing tower spray shut-off valve 21 is opened. The washing liquid in the first-stage water scrubbing tower 1 is transported to the top of the tower through the first-stage water scrubbing tower spray pipe 7 for spraying, and the tail gas is preliminarily scrubbed. The tail gas treated by the first-stage water scrubbing tower 1 enters the second-stage water scrubbing tower 2 through the tail gas inlet pipe 12. The second-stage water scrubbing tower spray pump 6 is started and the second-stage water scrubbing tower spray shut-off valve 23 is opened. The washing liquid in the second-stage water scrubbing tower 2 is transported to the top of the tower through the second-stage water scrubbing tower spray pipe 9 for spraying, and the tail gas is deeply scrubbed. The tail gas treated by the second-stage water scrubbing tower 2 is discharged through the outlet pipe 13. (2) When the concentration analyzer 25 of the first-stage water scrubbing tower detects that the concentration has reached the set value, it sends a signal to the PLC control system 19. The PLC control system 19 commands the opening of the acid shut-off valve 20 of the primary water washing tower and the closing of the spray shut-off valve 21 of the primary water washing tower, and begins to recover the acid in the primary water washing tower 1 through the hydrofluoric acid recovery pipeline 8. When the liquid level detector 15 of the primary water washing tower detects that the liquid level has dropped to 20cm, it sends a signal to the PLC control system 19, and the PLC control system 19 commands the primary water washing tower spray pump 4 to stop running. After the primary water washing tower spray pump 4 stops running, the PLC control system 19 commands the closing of the acid shut-off valve 20 of the primary water washing tower and the opening of the primary water washing tower spray shut-off valve 21. The PLC control system 19 commands the opening of the connecting pipeline shut-off valve 22 and the closing of the secondary water washing tower spray shut-off valve 23. (3) Real-time monitoring of liquid level: when the liquid level of the primary water washing tower 1 is greater than 75cm or the liquid level of the secondary water washing tower 2 is less than 20cm, the PLC control system 19 automatically closes the connecting pipeline shut-off valve 22. The PLC control system 19 commands the primary water washing tower spray pump 4 to start and opens the secondary water washing tower spray shut-off valve 23 and the secondary water washing tower water supply shut-off valve 24. When the secondary water washing tower level detector 16 detects that the liquid level has risen to 75cm, the PLC control system 19 commands the secondary water washing tower water supply shut-off valve 24 to close.

Claims

1. A high-efficiency automatic acid removal and washing system, characterized in that, It includes a primary water scrubbing tower (1), the top of the primary water scrubbing tower (1) is connected to the secondary water scrubbing tower (2) through the tail gas inlet pipe (12), the primary water scrubbing tower (1) is connected to the acidic tail gas inlet pipe (3), the bottom of the primary water scrubbing tower (1) is connected to the primary water scrubbing tower spray pump (4) through the pipe, the primary water scrubbing tower spray pump (4) is connected to the top of the primary water scrubbing tower (1) through the primary water scrubbing tower spray pipe (7), the primary water scrubbing tower (1) is equipped with a primary water scrubbing tower liquid level detector (15) and a primary water scrubbing tower concentration analyzer (25), and the primary water scrubbing tower liquid level detector (15) is connected to a PLC control system (19).

2. The high-efficiency automatic acid removal and washing system according to claim 1, characterized in that, The bottom of the secondary water washing tower (2) is connected to the secondary water washing tower spray pump (6) through a pipe. The secondary water washing tower spray pump (6) is connected to the top of the secondary water washing tower (2) through the secondary water washing tower spray pipe (9). A PLC primary signal line (17) is provided between the primary water washing tower level detector (15) and the PLC control system (19).

3. The high-efficiency automatic acid removal and washing system according to claim 2, characterized in that, The secondary water washing tower (2) is equipped with a secondary water washing tower level detector (16) and a secondary water washing tower concentration analyzer (26). A water supply pipe (14) is connected to the secondary water washing tower (2). The secondary water washing tower level detector (16) is connected to the PLC control system (19) through the PLC secondary signal line (18).

4. The high-efficiency automatic acid removal and washing system according to claim 3, characterized in that, An auxiliary pipe (10) and a connecting pipe (11) are connected between the primary water washing tower spray pipe (7) and the secondary water washing tower spray pipe (9). A standby pump (5) is connected to the auxiliary pipe (10). The standby pump (5) is connected to the bottom of the primary water washing tower (1) through a pipe and to the secondary water washing tower (2) through a pipe.

5. The high-efficiency automatic acid removal and washing system according to claim 4, characterized in that, The primary water washing tower spray pipe (7) is connected to a hydrofluoric acid recovery pipe (8), and the top of the secondary water washing tower (2) is connected to an outlet pipe (13).

6. The high-efficiency automatic acid removal and washing system according to claim 5, characterized in that, The hydrofluoric acid recovery pipeline (8) is equipped with a primary water washing tower acid shut-off valve (20), the primary water washing tower spray pipeline (7) is equipped with a primary water washing tower spray shut-off valve (21), the connecting pipeline (11) is equipped with a connecting pipeline shut-off valve (22), the secondary water washing tower spray pipeline (9) is equipped with a secondary water washing tower spray shut-off valve (23), and the water replenishment pipeline (14) is equipped with a secondary water washing tower water replenishment shut-off valve (24).

7. The high-efficiency automatic acid removal and washing system according to claim 6, characterized in that, The PLC control system (19) is connected to the acid shut-off valve (20) of the first-stage water washing tower, the spray shut-off valve (21) of the first-stage water washing tower, the shut-off valve (22) of the connecting pipeline, the spray shut-off valve (23) of the second-stage water washing tower, the water supply shut-off valve (24) of the second-stage water washing tower, the concentration analyzer (25) of the first-stage water washing tower, and the concentration analyzer (26) of the second-stage water washing tower.

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