A recovery device for circulating acid pump cooling water

Abstract

The utility model discloses a recycling device for circulating acid pump cooling water, including collecting liquid tank, inlet automatic valve, filter, circulating pump, outlet automatic valve, external exhaust pipeline, emergency water supply pipe, pressure gauge, circulating pipeline and temperature detection meter, and collecting liquid tank is equipped with ph detection meter, return pipeline and apron, and apron is located in the upper end of collecting liquid tank, and return pipeline one end stretches into collecting liquid tank, and ph detection meter is located in the upper end of apron, and inlet automatic valve, filter, circulating pump, outlet automatic valve and temperature detection meter are installed from left to right on circulating pipeline, and circulating pipeline one end stretches into collecting liquid tank, and pressure gauge, external exhaust pipeline and emergency water supply pipe are installed from left to right on circulating pipeline output end, and the utility model discloses the pH detection meter monitoring cooling water acidity, combines external exhaust pipeline and emergency water supply pipe and realizes automatic blowdown, water replenishment, and temperature detection meter monitors cooling water temperature, ensures that temperature maintains in safety threshold, and filter filters the impurity in cooling water, can effectively avoid pipeline blockage.

Description

Technical Field

[0001] This utility model relates to the field of metal smelting technology, specifically to a device for recovering cooling water for circulating acid pumps. Background Technology

[0002] In metal smelting, flue gas typically contains acidic components such as SO2, SO3, HCl, and HF, as well as a large amount of fine dust. To meet emission standards, an "acidic flue gas circulation scrubbing" process is usually employed. During this process, a circulating acid pump provides the circulation power for the scrubbing liquid. Over a prolonged circulation period, the acidity of the scrubbing liquid continuously increases, dust particles accumulate, and water-soluble impurities gradually increase, while the system temperature also rises. The mechanical seal, a key component of the circulating acid pump, usually requires cooling water to suppress deformation, wear, and material degradation of the sealing surface due to temperature rise. However, the cooling water temperature easily rises after passing through the mechanical seal, causing deformation of the sealing surface and slight leakage. The cooling water then becomes contaminated with acid, resulting in increased acidity, higher salt content, and more solid impurities. If the contaminated cooling water re-enters the mechanical seal, it will accelerate corrosion and abrasion of the seal components, leading to further leakage of the scrubbing liquid and, in severe cases, system shutdown and production interruption. Therefore, cooling water is usually treated using a "single direct discharge" method: each pump is independently connected to the plant's fresh industrial water supply, and after heat exchange via a mechanical seal, it is directly discharged into the sewage network. While this method is simple and reliable, large smelting plants often have dozens of circulating acid pumps operating simultaneously. If the cooling water for each pump were all discharged using the "single direct discharge" method, it would increase the volume of wastewater treated and raise the operating costs for subsequent neutralization, desalination, and solids removal of the wastewater.

[0003] Patent CN202421873368.4 discloses an acid pump mechanical seal cooling water circulation system, belonging to the field of circulating cooling water control technology. It includes: a circulating water tank, a circulating pump, an acid pump mechanical seal, an outlet pipe, a return pipe, a makeup water pipe, and a PLC electrical control system. The circulating water tank houses the circulating pump, which is electrically connected to the PLC control system. The outlet of the circulating pump is connected to the outlet pipe, which is equipped with a solenoid valve and a pressure gauge. The return pipe is equipped with a pH sensor, a pipe switching valve, and a second solenoid valve, and is connected to the circulating water tank. A makeup water pipe is located on one side of the circulating water tank. This system prevents acid from flowing into the cooling water circulation system after the mechanical seal corrodes, thus avoiding corrosion of the entire circulation system and eliminating potential production hazards. It also enables automatic cleaning of contaminated pipes, improving equipment stability. While the device can recycle cooling water and prevent acid from flowing into the cooling water circulation system after mechanical seal corrosion, it lacks an effective mechanism for treating solid impurities. When acid leaks, solid impurities such as salt crystals and metal corrosion products generated after the acid comes into contact with the cooling water will enter the circulating water tank with the return water. Relying solely on pipeline switching valves and rinsing with cooling water cannot completely remove all sediments and discharge them into the cleaning tank. When the system is restarted after the mechanical seal is repaired, the residues are flushed back into the circulating water tank and the acid pump mechanical seal, causing pipeline blockage, aggravating the corrosion of the sealing surface, and potentially leading to system shutdown or production interruption. Furthermore, the temperature detection device monitors the temperature of the circulating cooling water in real time. After the circulating cooling water passes through the mechanical seal for heat exchange, the temperature rise may exceed the threshold, making it impossible for the cooling water to effectively cool the mechanical seal. Utility Model Content

[0004] The purpose of this invention is to provide a recycling device for circulating acid pump cooling water that automatically discharges sewage, effectively filters solid impurities in cooling water, monitors cooling water temperature in real time, and is easy to operate, in order to solve the technical problems in the prior art where solid impurity sedimentation cannot be effectively removed and insufficient monitoring of circulating cooling water temperature leads to seal failure and system blockage.

[0005] To solve the above technical problems, the solution adopted by this utility model is as follows: A device for recovering cooling water from a circulating acid pump includes a collection tank, an inlet automatic valve, a filter, a circulating pump, an outlet automatic valve, an external discharge pipe, an emergency water supply pipe, a pressure gauge, a circulating pipe, and a temperature sensor (16). The collection tank is equipped with a pH sensor, a return pipe, and a cover plate. The cover plate is located at the upper end of the collection tank. One end of the return pipe extends through the cover plate into the collection tank, and the other end is connected to the cooling water outlet of the circulating acid pump. The pH sensor is located at the upper end of the cover plate, and its lower end extends into the collection tank. The inlet automatic valve, filter, circulating pump, outlet automatic valve, and temperature sensor are installed sequentially from left to right on the circulating pipe. The input end of the circulating pipe extends into the collection tank, and the output end is connected to the cooling water inlet of the circulating acid pump. The pressure gauge, external discharge pipe, and emergency water supply pipe are installed from left to right at the output end of the circulating pipe. All components are controlled by an external control system. The emergency water supply pipe is connected to an external water source. The volume of the liquid collection tank is approximately the volume of cooling water that the circulating acid pump can deliver in one hour.

[0006] Cooling water after cooling the mechanical seal is collected from the outlet of the circulating acid pump's mechanical seal through a return pipe into a collection tank. A pH meter monitors the acidity in the tank in real time. The circulating pump is then started, drawing water from the tank at the inlet end of the circulation pipe. Water passes through the inlet automatic valve to the filter for impurities, then through the outlet automatic valve to the temperature sensor for temperature monitoring before flowing back to the outlet end of the circulation pipe, completing one cycle. If the temperature is too high, the emergency water supply pipe is opened to combine with the circulating cooling water for temperature adjustment before returning it to the mechanical seal for cooling, ensuring the cooling water temperature remains within a safe threshold. A pressure gauge monitors the circulation pressure to ensure stable water pressure entering the mechanical seal. When the pH... When the pH meter detects a result within the set range, the device operates in a closed-loop circulation state. When the pH meter detects a water quality result outside the set range, the external drain pipe is opened, and all the cooling water in the collection tank is discharged through the circulation pump. At the same time, the emergency water supply pipe is opened to supply new cooling water to the mechanical seal for cooling and flushing the pipes. Then, the circulation pump and the circulating acid pump are shut down, and the circulating acid pump is inspected and maintained. When the pressure gauge detects an abnormal pressure (such as excessively high pressure due to filter blockage or excessively low pressure due to leakage from a ruptured circulation pipe), the circulation pump is shut down, and water is supplied to the circulating acid pump for cooling through the emergency water supply pipe, facilitating the inspection and maintenance of the recovery device by the staff.

[0007] Furthermore, the liquid collection tank is equipped with a level gauge, a water supply pipe, and a water supply valve; the level gauge is located at the upper end of the cover plate, and its lower end extends into the liquid collection tank; the water supply valve is installed on the water supply pipe; one end of the water supply pipe extends into the liquid collection tank; the level gauge and the water supply valve are electrically connected.

[0008] The level gauge's detection end extends into the collection tank to measure the liquid level in real time. The water supply pipe is connected to an external water source, and the external controller has minimum and maximum liquid level values. When the level gauge detects the minimum liquid level, the water supply valve opens, and water is supplied through the water supply pipe. When the maximum liquid level is reached, the water supply valve closes, ensuring that the collection tank is always within a safe liquid level range. This prevents the circulating pump from cavitating due to excessively low liquid levels caused by evaporation, leakage, or sewage discharge, which could lead to a lack of cooling water for the mechanical seal.

[0009] Furthermore, the circulation pipeline is equipped with an outlet check valve; the outlet check valve is located between the circulation pump and the outlet automatic valve. The outlet check valve is a one-way valve installed between the circulation pump outlet and the outlet automatic valve. It automatically opens under positive water pressure when the circulation pump is running, allowing cooling water to flow smoothly to the mechanical seal and preventing liquid backflow.

[0010] Furthermore, the external discharge pipe is equipped with a matching drain valve; the emergency water supply pipe is equipped with a matching water supply valve; the pH meter and pressure gauge are electrically connected to the drain valve and water supply valve. The pH meter and pressure gauge are connected to the drain valve and water supply valve via electrical signals to form an automatic control system. When the pH meter detects that the pH value of the cooling water is lower than the set safety threshold, the external controller controls the drain valve to open, discharging the contaminated or abnormal cooling water from the recovery device. At the same time, the water supply valve automatically opens to introduce new cooling water to maintain the normal operation of the system. When the pressure gauge detects an abnormal pressure, the circulation pump of the recovery device stops running, facilitating inspection and maintenance by operators. Simultaneously, the controller controls the water supply valve to open to supply water, ensuring the normal operation of the mechanical seal of the circulation pump.

[0011] The working principle of this utility model is as follows: In operation, connect the inlet of the circulation pipe to the outlet of the mechanical seal of the circulating acid pump. Cooling water, after cooling the mechanical seal, is collected from the outlet of the circulating acid pump's mechanical seal through the return pipe and enters the collection tank. The pH meter monitors the acidity in the tank in real time. When the circulation pump is started, water is drawn from the tank at the inlet of the circulation pipe, passes through the inlet automatic valve to the filter for impurity filtration, and then flows through the outlet automatic valve to the outlet of the circulation pipe, returning to the inlet of the mechanical seal, completing one cycle. The pressure gauge monitors the circulation pressure to ensure stable cooling water pressure entering the mechanical seal. When the pH meter reading is within the set range, the device is in a closed-loop circulation state, ensuring continuous circulation. The acid pump provides stable cooling water. When the pH meter detects water quality outside the set range, the drain valve is opened, and all contaminated or abnormal cooling water in the collection tank is pumped out through the external drain pipe and the circulating pump. At the same time, the water supply valve is opened, and new cooling water is supplied to the mechanical seal through the emergency water supply pipe for cooling and flushing the pipes. Then, the circulating pump and circulating acid pump are shut down for inspection and maintenance of the circulating acid pump. When the pressure gauge detects abnormal pressure, the controller stops the circulating pump of this recovery device to facilitate inspection and maintenance by the operator. At the same time, the water supply valve is opened to supply new cooling water to the mechanical seal through the emergency water supply pipe to ensure the normal operation of the mechanical seal of the circulating water pump.

[0012] The beneficial effects of this utility model are as follows: 1. This utility model uses a pH meter to monitor the acidity of cooling water in real time, and combines it with an external drainage pipe and an emergency water supply pipe to achieve automatic sewage discharge and water replenishment, effectively preventing acidic cooling water from corroding mechanical seals and extending equipment life. A temperature meter monitors the cooling water temperature in real time to ensure that the cooling water temperature is maintained within a safe threshold. A filter can effectively filter solid impurities in the cooling water to prevent these impurities from flowing back into the circulating acid pump mechanical seal and pipelines. A pressure gauge can detect the pressure in the circulating pipeline in real time to ensure stable cooling water pressure and avoid equipment damage caused by abnormal pressure. The overall automation level is high, reducing manual maintenance costs and improving production continuity.

[0013] 2. This utility model ensures that the liquid level in the collection tank is always within a safe range through a level gauge and a water supply valve, preventing the circulating pump from cavitating due to excessively low liquid level, and ensuring a stable supply of cooling water to the mechanical seal. The pH meter and pressure gauge control the drain valve and water supply valve through electrical signals to achieve automatic sewage discharge and water replenishment, ensuring the quality of cooling water and the stability of the overall system pressure, thereby improving the reliability and safety of system operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0015] In the diagram: 1. Collection tank; 2. Inlet automatic valve; 3. Filter; 4. Circulation pump; 5. Outlet check valve; 6. Outlet automatic valve; 7. Outlet drain pipe; 71. Drain valve; 8. Emergency water supply pipe; 81. Water supply valve; 9. Level gauge; 10. Water supply pipe; 101. Water supply valve; 11. pH meter; 12. Return pipe; 13. Cover plate; 14. Pressure gauge; 15. Circulation pipe; 16. Temperature sensor. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0018] The following is a detailed description of a device for recovering cooling water from a circulating acid pump, in conjunction with the accompanying drawings: Example

[0019] A device for recovering cooling water from a circulating acid pump includes a collection tank 1, an inlet automatic valve 2, a filter 3, a circulating pump 4, an outlet automatic valve 6, an external discharge pipe 7, an emergency water supply pipe 8, a pressure gauge 14, a circulating pipe 15, and a temperature sensor 16. The collection tank 1 is equipped with a pH meter 11, a return pipe 12, and a cover plate 13. The cover plate 13 is located at the upper end of the collection tank 1. One end of the return pipe 12 passes through the cover plate 13 and extends into the collection tank 1, while the other end connects to the cooling water outlet of the circulating acid pump. The water inlet is connected; the pH meter 11 is located at the upper end of the cover plate 13, and its lower end extends into the collection tank 1; the inlet automatic valve 2, filter 3, circulation pump 4, outlet automatic valve 6 and temperature meter 16 are installed on the circulation pipe 15 from left to right; the input end of the circulation pipe 15 extends into the collection tank 1, and the output end is connected to the cooling water inlet of the circulation acid pump; the pressure gauge 14, the external discharge pipe 7 and the emergency water supply pipe 8 are installed on the output end of the circulation pipe 15 from left to right.

[0020] The working principle of this embodiment is as follows: Cooling water after cooling the mechanical seal is collected from the outlet of the circulating acid pump's mechanical seal through return pipe 12 into the collection tank 1. The pH meter 11 monitors the acidity in the collection tank 1 in real time, and the circulating pump 4 is activated, causing the input end of the circulating pipe 15 to draw water from the collection tank 1. The water passes through the inlet automatic valve 2 to the filter 3 for impurity filtration, and then flows through the outlet automatic valve 6 to the output end of the circulating pipe 15. The temperature is measured by the temperature sensor 16. If the temperature is normal, the water is returned to the inlet of the mechanical seal, completing one cycle. If the temperature is too high, the emergency water supply pipe can be opened to introduce new cooling water to combine with the circulating cooling water and lower the temperature. The pressure gauge 14 monitors the pressure in the circulating pipe 15 in real time to ensure stable water pressure entering the mechanical seal. When the pH meter 11... When the detected result is within the set range, the recovery device is in a closed-loop circulation state. When the water quality result detected by pH meter 11 is outside the set range, the external discharge pipe 7 is opened, and all the cooling water in the collection tank 1 is discharged through the circulation pump 4. At the same time, the emergency water supply pipe 8 is opened to supply new cooling water to the mechanical seal for cooling and flushing the pipes. Then, the circulation pump 4 and the circulating acid pump are turned off to facilitate the staff to inspect and maintain the circulating acid pump. When the pressure detected by pressure gauge 14 is abnormal, such as the excessive pressure caused by the filter 3 being blocked by impurities, the circulation pump 4 is turned off, and water is supplied to the circulating acid pump for cooling through the emergency water supply pipe 8. At the same time, the staff replaces the filter element of the filter 3 of this recovery device or cleans it. After the operation is completed, the recovery device is turned on again to circulate cooling water. Example

[0021] The difference from Embodiment 1 is that the collection tank 1 is equipped with a level gauge 9, a water supply pipe 10, and a water supply valve 101; the level gauge 9 is located at the upper end of the cover plate 13, and its lower end extends into the collection tank 1; the water supply valve 101 is installed on the water supply pipe 10; one end of the water supply pipe 10 extends into the collection tank 1; the level gauge 9 and the water supply valve 101 are electrically connected; the circulation pipe 15 is equipped with an outlet check valve 5; the outlet check valve 5 is located between the circulation pump 4 and the outlet automatic valve 6; the external discharge pipe 7 is equipped with a matching drain valve 71; the emergency water supply pipe 8 is equipped with a matching water supply valve 81; the pH meter 11 and the pressure gauge 14 are both electrically connected to the drain valve 71 and the water supply valve 81.

[0022] The level gauge 9 extends into the collection tank 1 to measure the liquid level in real time. An external controller has minimum and maximum liquid level values. When the level gauge 9 detects the minimum liquid level, the water supply valve 101 opens, supplying water through the water supply pipe 10. When the maximum liquid level is reached, the water supply valve 101 closes. The pH meter 9 and pressure gauge 14 are connected to the drain valve 71 and the water supply valve 81 via electrical signals, forming an automatic control system. When the pH meter 11 detects that the pH value of the cooling water is lower than the set safety threshold, the external controller controls the drain valve 81 to open, allowing contaminated or abnormal cooling water to pass through. The water is discharged through the external discharge pipe 7 and simultaneously, the control water supply valve 81 is opened to introduce new cooling water. When the pressure gauge 14 detects an abnormal pressure inside the circulation pipe 15, it transmits a signal to the external controller. The controller then controls the circulation pump 4 of this recovery device to stop running and notifies the operator to perform inspection and maintenance. At the same time, the controller will control the water supply valve 81 to open and supply water through the emergency water supply pipe 8 to maintain the normal operation of the circulation acid pump. The circulated water is collected through the collection tank 1 and circulated again after the staff has finished inspecting and maintaining the recovery device and turned it on, thus reducing water waste. The outlet check valve 5 is installed between the outlet of the circulation pump 4 and the outlet automatic valve 6. It automatically opens under positive water pressure when the circulation pump 4 is running, allowing the cooling water to flow smoothly to the mechanical seal and effectively preventing liquid backflow.

[0023] The working principle of this embodiment is the same as that of Embodiment 1.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A recovery device for circulating acid pump cooling water, characterized by: It includes a collection tank (1), an inlet automatic valve (2), a filter (3), a circulation pump (4), an outlet automatic valve (6), an external discharge pipe (7), an emergency water supply pipe (8), a pressure gauge (14), a circulation pipe (15), and a temperature sensor (16); the collection tank (1) is equipped with a pH sensor (11), a return pipe (12), and a cover plate (13); The cover plate (13) is located at the upper end of the liquid collection tank (1); one end of the return pipe (12) passes through the cover plate (13) and extends into the liquid collection tank (1), and the other end is connected to the cooling water outlet of the circulating acid pump; the pH meter (11) is located at the upper end of the cover plate (13), and the lower end extends into the liquid collection tank (1); The inlet automatic valve (2), filter (3), circulation pump (4), outlet automatic valve (6) and temperature sensor (16) are installed on the circulation pipe (15) from left to right; the inlet end of the circulation pipe (15) extends into the liquid collection tank (1) and the outlet end is connected to the cooling water inlet of the circulation acid pump; the pressure gauge (14), drain pipe (7) and emergency water supply pipe (8) are installed on the outlet end of the circulation pipe (15) from left to right.

2. A recovery device for cooling water of a circulating acid pump according to claim 1, characterized in that: The liquid collection tank (1) is equipped with a level gauge (9), a water supply pipe (10) and a water supply valve (101); the level gauge (9) is located at the upper end of the cover plate (13) and the lower end extends into the liquid collection tank (1); the water supply valve (101) is installed on the water supply pipe (10); one end of the water supply pipe (10) extends into the liquid collection tank (1); the level gauge (9) and the water supply valve (101) are electrically connected.

3. A recovery device for cooling water of a circulating acid pump according to claim 1, characterized in that: The circulation pipeline (15) is equipped with an outlet check valve (5); the outlet check valve (5) is located between the circulation pump (4) and the outlet automatic valve (6).

4. A recovery device for cooling water of a circulating acid pump according to claim 1, characterized in that: The external discharge pipe (7) is equipped with a matching drain valve (71); the emergency water supply pipe (8) is equipped with a matching water supply valve (81); the pH meter (11) and the pressure gauge (14) are both electrically connected to the drain valve (71) and the water supply valve (81).

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