Cooling water circulation group for acid pump mechanical seal

Abstract

The utility model discloses a cooling water circulation group of an acid pump mechanical seal, which belongs to the technical field of circulating cooling water control and comprises a circulation water tank, a circulation pump, an acid pump mechanical seal, a water outlet pipeline, a water return pipeline, a water replenishing pipeline and a PLC (programmable logic controller) electric control system, the circulation pump is arranged in the circulation water tank and electrically connected with the PLC electric control system, and a water outlet of the circulation pump is connected with the water outlet pipeline. A first electromagnetic valve and a first pressure gauge are arranged on the water outlet pipeline, a pH sensor, a pipeline switching valve and a second electromagnetic valve are arranged on the water return pipeline, the water return pipeline is connected with the circulating water tank, and a water supplementing pipeline is arranged on one side of the circulating water tank, so that acid liquor cannot flow into a cooling water circulating system after mechanical seal corrosion to corrode the whole circulating system, and potential production hazards are eliminated; and meanwhile, automatic cleaning of the polluted pipeline can be achieved, and the equipment stability performance is improved.

Description

Technical Field

[0001] The utility model patent relates to the technical field of circulating cooling water control, in particular to an acid pump mechanical seal cooling water circulation group. Background Technique

[0002] Flue gas to sulfuric acid in molybdenum production is a process of converting sulfur-containing gases generated in the smelting process into sulfuric acid. This conversion not only reduces environmental pollution but also brings economic benefits to enterprises through resource reuse. The flue gas to sulfuric acid production process mainly includes processes such as flue gas scrubbing and purification, conversion, etc. Each process involves many scrubbing towers and circulation pumps. The main components of the flue gas are sulfur dioxide, sulfur trioxide, etc. After the flue gas scrubbing and purification process, the system circulating liquid is in an acidic state. The circulating water in an acidic state corrodes the mechanical seal of the circulation pump, causing liquid leakage. In actual production, the mechanical seal cooling water pipelines of the circulation pumps everywhere are interconnected. When the mechanical seal of one circulation pump leaks liquid, this dilute acid will enter the total circulating water pipeline after leakage, gradually polluting the entire circulating water system, gradually corroding the circulating water pipeline and other production equipment, damaging production components, causing potential hazards to the operation of the system circulation pump, and the polluted pipeline needs to be disassembled and cleaned, which is cumbersome to operate and affects the production progress. Content of the Utility Model

[0003] The utility model discloses an acid pump mechanical seal cooling water circulation group, which controls the water outlet pipeline, the water return pipeline and the water replenishment pipeline through a PLC electric control system, realizes the control in the first time after the mechanical seal is corroded by acid and leaks liquid, and can be cleaned through the water replenishment pipeline after the repair of the corroded mechanical seal. This solution solves the problem of potential safety hazards caused by the pollution of the circulating water system after the mechanical seal is corroded in the prior art.

[0004] An acid pump mechanical seal cooling water circulation group disclosed by the utility model includes: a circulation water tank, a circulation pump, an acid pump mechanical seal, a water outlet pipeline, a water return pipeline, a water replenishment pipeline and a PLC electric control system. A circulation pump is arranged inside the circulation water tank. The circulation pump is electrically connected to the PLC electric control system. The water outlet of the circulation pump is connected to the water outlet pipeline. An electromagnetic valve I and a pressure gauge I are arranged on the water outlet pipeline. A pH sensor, a pipeline switching valve and an electromagnetic valve II are arranged on the water return pipeline. The water return pipeline is connected to the circulation water tank. A water replenishment pipeline is arranged on one side of the circulation water tank.

[0005] Preferably, there are multiple groups of the acid pump mechanical seal, the water outlet pipeline and the water return pipeline, and they are connected in parallel.

[0006] Preferably, the electromagnetic valve I, the pressure gauge I are electrically connected to the PLC electric control system. When the pressure value measured by the pressure gauge I in the water outlet pipeline exceeds a predetermined threshold, the PLC electric control system controls the closing of the electromagnetic valve I.

[0007] Preferably, the pH sensor in the return water pipeline is arranged in front of the pipeline switching valve, the second electromagnetic valve is arranged behind the pipeline switching valve, the pH sensor, the pipeline switching valve and the second electromagnetic valve are electrically connected to the PLC electric control system. When the acidity of the circulating water monitored by the pH sensor exceeds the preset threshold, the PLC electric control system adjusts the direction of the pipeline switching valve and closes the electromagnetic valve at the same time and issues an acid leakage alarm.

[0008] Preferably, a cleaning pool is arranged on one side of the pipeline switching valve, and the installation height of the pipeline switching valve is lower than the installation height of the acid pump mechanical seal.

[0009] Preferably, a third electromagnetic valve is arranged on the make-up water pipeline, and the third electromagnetic valve is electrically connected to the PLC electric control system. When the liquid level in the circulating water tank is lower than the preset threshold, the third electromagnetic valve is opened to replenish water to the circulating water tank.

[0010] Preferably, a fluorocarbon resin coating or an epoxy resin coating is provided on the inner side of the pipe walls of the circulating pump, the acid pump mechanical seal, the water outlet pipeline and the return water pipeline.

[0011] Beneficial effects

[0012] The utility model improves the circulating water pipeline for cooling through the flue gas acid production. By setting the PLC electric control system to control the electrical components on the cooling circulating pipeline, it can give an early warning and replace the leaking mechanical seal in the first time without affecting the operation of other production equipment, and prevent the acid liquid from flowing into the cooling water circulation system after the mechanical seal is corroded and corroding the whole circulation system, eliminating production hidden dangers.

[0013] The utility model is provided with a pipeline switching valve and a cleaning pool in the return water pipeline, and the installation height of the pipeline switching valve is lower than the installation height of the acid pump mechanical seal, so that the mixed acid liquid can be discharged into the cleaning pool through the return water pipeline. After the mechanical seal is repaired, the polluted pipeline can be cleaned by introducing cooling water into the repaired acid pump mechanical seal, realizing the automatic cleaning of the polluted pipeline. The utility model has simple operation and improves the stability performance of the equipment. Brief description of the drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative work.

[0015] Figure 1 It is a layout schematic diagram of the cooling water circulation group of the acid pump mechanical seal;

[0016] Figure 2 It is a layout schematic diagram of the cooling water circulation group of the acid pump mechanical seal;

[0017] Figure 3 It is a schematic flow diagram of the cooling water circulation group of the acid pump mechanical seal;

[0018] Figure 4 It is a schematic layout diagram of a cooling water circulation group of an acid pump mechanical seal;

[0019] In the figure: 1. Circulation water tank, 2. Circulation pump, 3. Acid pump mechanical seal, 4. Outlet pipeline, 5. Return pipeline, 6. Make-up water pipeline, 7. Pressure gauge II, 8. PLC electric control system, 9. Solenoid valve I, 10. Pressure gauge I, 11. pH sensor, 12. Solenoid valve II, 13. Pipeline switching valve, 14. Cleaning pool, 15. Solenoid valve III. Specific implementation manners

[0020] A cooling water circulation group for an acid pump mechanical seal 3 includes: a circulation water tank 1, a circulation pump 2, an acid pump mechanical seal 3, an outlet pipeline 4, a return pipeline 5, a make-up water pipeline 6, and a PLC electric control system 8. A circulation pump 2 is arranged inside the circulation water tank 1. The circulation pump 2 supplies water to the cooling water circulation pipeline in the circulation water tank 1. The circulation pump 2 is electrically connected to the PLC electric control system 8, and the opening and closing of the circulation pump 2 can be controlled through the PLC electric control system 8. The circulation pump 2 is connected to an outlet pipeline 4, and the outlet pipeline 4 is connected to the water inlet of the acid pump mechanical seal 3 of each device. A solenoid valve I 9 and a pressure gauge I 10 are arranged on the outlet pipeline 4. The return pipeline 5 is provided with a pH sensor 11, a pipeline switching valve 13, and a solenoid valve II 12. The return pipeline 5 is connected to the water outlet end of the acid pump mechanical seal 3, and the return pipeline 5 is connected to the circulation water tank 1. The return pipeline 5 introduces the cooling circulating water into the circulation water tank 1 to realize the circulating cooling of the cooling water. A make-up water pipeline 6 is arranged on one side of the circulation water tank 1.

[0021] In some embodiments, the solenoid valve I 9 and the pressure gauge I 10 are electrically connected to the PLC electric control system 8. When the pressure value measured by the pressure gauge I 10 in the outlet pipeline 4 exceeds a predetermined threshold, the PLC electric control system 8 controls to close the solenoid valve I 9 to prevent excessive pressure in the pipeline from damaging the acid pump mechanical seal 3.

[0022] In some embodiments, the pH sensor 11 in the return pipeline 5 is arranged in front of the pipeline switching valve 13, and the solenoid valve II 12 is arranged behind the pipeline switching valve 13. The pH sensor 11, the pipeline switching valve 13, and the solenoid valve II 12 are electrically connected to the PLC electric control system. When the acidity of the circulating water monitored by the pH sensor 11 exceeds a preset threshold, the PLC electric control system 8 adjusts the direction of the pipeline switching valve 13 and closes the solenoid valve I 9 and the solenoid valve II 12 at the same time. Closing the solenoid valve I 9 reduces the waste of cooling water entering. Closing the solenoid valve II 12 prevents the cooling water contaminated by acid liquid from entering the cooling water circulation system and polluting the entire cooling water circulation system when the pipeline switching valve 13 fails. The PLC electric control system simultaneously issues an acid leakage alarm to remind the staff to replace the acid-leaking mechanical seal in time.

[0023] In some embodiments, a cleaning pool 14 is provided on one side of the pipeline switching valve 13. The installation height of the pipeline switching valve 13 is lower than that of the acid pump mechanical seal 3. When the acid pump mechanical seal 3 is corroded by acid liquid and leaks acid liquid, the PLC electronic control system 8 adjusts the pipeline switching valve 13 to adjust the outlet of the return water pipeline 5 to the cleaning pool. Since the installation height of the pipeline switching valve 13 is lower than that of the acid pump mechanical seal 3, the remaining contaminated cooling water in the pipeline flows into the cleaning pool 14. When the repair of the mechanical seal is completed, the corresponding solenoid valve 9 is opened, and the cooling water enters the repaired mechanical seal to clean the mechanical seal and the pipeline.

[0024] In some embodiments, a solenoid valve 15 is provided on the make-up water pipeline. The solenoid valve 15 is electrically connected to the PLC electronic control system 8. When the liquid level in the circulation water tank 1 is lower than the preset threshold, the PLC electronic control system 8 opens the solenoid valve 15 to replenish water to the circulation water tank 1, realizing automatic water replenishment of the circulation water tank 1.

[0025] In some embodiments, when multiple groups of acid pump mechanical seals 3 are corroded by acid liquid and cause the solenoid valve 12 to close, since the circulation pump 2 continues to operate, the pressure in the outlet pipeline increases. When the pressure gauge 7 monitors that the pressure value exceeds the predetermined threshold, the PLC electronic control system 8 controls the circulation pump 2 to stop operating.

[0026] In some embodiments, a fluorocarbon resin coating or an epoxy resin coating is provided on the inner side of the pipe walls of the circulation pump 2, the acid pump mechanical seal 3, the outlet pipeline 4, and the return water pipeline 5. By adding an anti-corrosion coating, the acid pump mechanical seal 3 and the pipeline have strong anti-corrosion performance, improving the stability of the cooling equipment.

[0027] Embodiment 1

[0028] In a specific embodiment provided by the present utility model, as Figures 1-4 shown, the circulation pump 2 pumps the cooling water in the circulation water tank 1 to the outlet pipeline 4. The cooling water passes through the outlet pipeline 4 and the acid pump mechanical seal 3 to cool the equipment. When the acid pump mechanical seal 3 is corroded by acid liquid and leaks liquid, the cooling water passing through the acid pump mechanical seal 3 is contaminated by the acid liquid, and the pH value of the cooling water decreases. When the pH sensor 11 on the return water pipeline 5 monitors that the pH value of the cooling water in the return water pipeline 5 is lower than the predetermined threshold, the pH sensor 11 transmits the monitoring information to the PLC electronic control system 8. The PLC electronic control system 8 controls the pipeline switching valve 13 to switch the outlet direction of the return water pipeline 5 to the cleaning pool 14. At the same time, the PLC electronic control system 8 controls the solenoid valve 9 and the solenoid valve 12 to close. Since the installation height of the pipeline switching valve 13 is lower than that of the acid pump mechanical seal 3, the contaminated cooling water in the pipeline flows to the cleaning pool 14 due to the height difference, preventing the entire cooling water circulation system from being contaminated by acid liquid.

[0029] In the present utility model, after the repair of the corroded acid pump mechanical seal 3 is completed, the solenoid valve 9 is controlled by the PLC electric control system 8 to open. After the solenoid valve 9 is opened, the cooling water enters the acid pump mechanical seal 3 again and flows into the cleaning pool 14 through the pipeline switching valve 13, completing the cleaning of the contaminated pipeline. After the pipeline cleaning is completed, the PLC electric control system 8 controls the pipeline switching valve 13 to adjust the pipeline flow direction, and at the same time opens the solenoid valve 12. The cooling water flows back to the circulation water tank 1 through the solenoid valve 12. When the liquid level in the circulation water tank 1 is lower than the preset threshold, the PLC electric control system 8 opens the solenoid valve 15 to automatically replenish water to the circulation water tank 1, realizing the stable operation of the entire cooling water circulation device.

[0030] Embodiment 2

[0031] In the present utility model, the pipeline switching valve 13 is an electric three-way ball valve or an electric three-way flow dividing valve.

[0032] Embodiment 3

[0033] When there is one group of acid pump mechanical seals 3 in the present utility model, as Figure 3 shown, the pressure gauge 10 in the water outlet pipeline 4 is arranged in front of the solenoid valve 9. When the acid pump mechanical seal 3 is corroded and causes liquid leakage, the pH sensor 11 sends the monitoring signal to the PLC electric control system 8. The PLC electric control system 8 controls the pipeline switching valve 13 to adjust the water outlet direction. At the same time, the PLC electric control system 8 controls the solenoid valve 9 and the circulation pump 2 to close. The contaminated acid liquid flows into the cleaning pool 14 from the pipeline switching valve 13. After the repair of the acid pump mechanical seal 3 is completed, the PLC electric control system 8 controls the solenoid valve 9 and the circulation pump 2 to open. The cooling water enters the cleaning pool 14 through the repaired acid pump mechanical seal 3, completing the cleaning of the contaminated pipeline. After the pipeline cleaning is completed, the PLC electric control system 8 controls the pipeline switching valve 13 to adjust the water outlet, so that the cooling water circulates to the circulation water tank 1, completing the replacement of the mechanical seal corroded by the acid liquid.

Claims

1. An acid pump mechanical seal cooling water circulation unit, characterized in that: include: A circulating water tank, a circulating pump, an acid pump seal, an outlet pipeline, a return pipeline, a water supply pipeline and a PLC electronic control system. A circulating pump is provided inside the circulating water tank, and the circulating pump is electrically connected to the PLC electronic control system. The water outlet of the circulating pump is connected to the outlet pipeline. A solenoid valve 1 and a pressure gauge 1 are provided on the outlet pipeline. The return pipeline is provided with a pH sensor, a pipeline switching valve and a solenoid valve 2. The return pipeline is connected to the circulating water tank. A water supply pipeline is provided on one side of the circulating water tank.

2. The acid pump mechanical seal cooling water circulation unit according to claim 1, characterized in that: The acid pump seal, the water outlet pipeline and the water return pipeline are multiple groups and are connected in parallel.

3. The acid pump mechanical seal cooling water circulation unit according to claim 1, characterized in that: The solenoid valve 1 and the pressure gauge 1 are electrically connected to the PLC electronic control system. When the pressure value measured by the pressure gauge 1 in the water outlet pipeline exceeds a predetermined threshold, the PLC electronic control system controls the closing of the solenoid valve 1.

4. The acid pump mechanical seal cooling water circulation unit according to claim 1, characterized in that: The pH sensor in the return water pipeline is arranged in front of the pipeline switching valve, and the solenoid valve 2 is arranged behind the pipeline switching valve. The pH sensor, the pipeline switching valve and the solenoid valve 2 are electrically connected to the PLC electronic control system. When the pH sensor monitors that the acidity of the circulating water exceeds a preset threshold, the PLC electronic control system adjusts the direction of the pipeline switching valve and closes the solenoid valve at the same time to issue an acid leakage alarm.

5. The acid pump mechanical seal cooling water circulation unit according to claim 1, characterized in that: A cleaning pool is provided on one side of the pipeline switching valve, and the pipeline switching valve is set at a height lower than the acid pump machine seal setting height.

6. The acid pump mechanical seal cooling water circulation unit according to claim 1, characterized in that: The water supply pipeline is provided with a solenoid valve three, which is electrically connected to the PLC electronic control system. When the liquid level in the circulating water tank is lower than a preset threshold, the solenoid valve three is opened to supply water to the circulating water tank.

7. The acid pump mechanical seal cooling water circulation unit according to claim 1, characterized in that: The inner sides of the pipe walls of the circulation pump, the acid pump mechanical seal, the water outlet pipeline and the water return pipeline are provided with a fluorocarbon resin coating or an epoxy resin coating.

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