Concentrated nitric acid taking device with pressure stabilizing function

Abstract

The utility model relates to a concentrated nitric acid liquid taking device with a pressure stabilizing function, which belongs to the technical field of storage devices and comprises a pressure pump, a nitric acid tank, a liquid taking pipeline, an acid return pipeline, a pressure relief pipeline, a metering pump, a pressure stabilizing device, a PLC (programmable logic controller) electric control system and a mixer. A check valve is arranged in front of the metering pump, the liquid taking pipeline is connected with a pressure stabilizing device, an acid return pipeline is arranged below the pressure stabilizing device, the acid return pipeline is communicated with an initial section of the liquid taking pipeline, the pressure stabilizing device is communicated with a mixer, and the mixture enters a mixing pool to be subjected to extraction reaction with a wastewater solution after being mixed by the mixer. The device solves the problems that the pH value in the acid preparation process is inaccurate and the production is not smooth due to the fact that the flow of nitric acid pumped out by the metering pump is unstable and is in an unstable high and low state, and the production efficiency and the production safety are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of storage devices, and particularly relates to a concentrated nitric acid liquid extraction device with a voltage stabilizing function. Background Art

[0002] During the process of preparing ammonium molybdate from molybdenum oxide ore, in the pickling process, impurities are removed from the molybdenum oxide ore by adding nitric acid. The high ammonia-nitrogen industrial sewage generated usually undergoes steps such as purification, neutralization, and filtration to complete the impurity removal process. The sewage contains metal impurities such as calcium, magnesium, copper, iron, and aluminum. During the removal process, chemicals need to be added, and then the pH value is adjusted to remove the impurities. In the process of adding nitric acid for neutralization, nitric acid is pumped from a nitric acid storage tank into the wastewater solution through a metering pump. However, the flow rate of the nitric acid pumped out by the metering pump is unstable, showing a state of fluctuating up and down, making it difficult to accurately control the pH value during the acid preparation process and causing production to be unsmooth.

[0003] The nitric acid storage tank is located underground, the nitric acid metering pump is on top of the nitric acid storage tank, the suction port of the pump is at the bottom of the tank, and the insertion depth of the pump suction pipe is 2m. There are often problems such as a decrease in the pump outlet pressure and the inability to discharge acid, as well as unstable pressure of the metering pump. Since the metering pump is a diaphragm type, after stopping the pump, water needs to be injected into the metering pump body before it can be restarted, which requires manual operation by personnel. Repeated operation poses production risks and operation errors, and affects production efficiency. Content of the Utility Model

[0004] The purpose of the utility model is to provide a concentrated nitric acid liquid extraction device with a voltage stabilizing function. The liquid extraction pipeline and the acid return pipeline connected to the nitric acid tank are connected to a voltage stabilizing device to ensure that the metering pump can output stably. After starting the pump, there is no need to additionally fill the liquid. While ensuring operation safety, it also ensures stable output of nitric acid liquid. The PLC electric control system is used to control relevant electric valves to make the adjustment of the pH value of the prepared liquid more accurate and reduce the production risks of manual operation.

[0005] To solve the above technical problems, the utility model provides a concentrated nitric acid liquid extraction device with a voltage stabilizing function, including: a pressure pump, a nitric acid tank, a liquid extraction pipeline, an acid return pipeline, a pressure relief pipeline, a metering pump, a voltage stabilizing device, a PLC electric control system, and a mixer. The nitric acid tank is connected to the liquid extraction pipeline and the pressure relief pipeline. The liquid extraction pipeline is provided with a metering pump, a damper, and a check valve. The liquid extraction pipeline is connected to the voltage stabilizing device. The acid return pipeline is provided below the voltage stabilizing device. The output end of the voltage stabilizing device is communicated with the mixer. An alkaline liquid is added to the mixer to mix with nitric acid for adjusting the pH value of the solution. After adjustment, the solution is introduced into a mixing tank for an extraction reaction with the wastewater solution. The PLC electric control system automatically controls the metering pump and the pressure pump.

[0006] Preferably, the pressure pump is connected to the nitric acid tank. An exhaust port, a pressure gauge, an acid discharge port, a manhole, a liquid extraction port, a return liquid port, and a liquid level gauge are successively provided above the nitric acid tank. The liquid level gauge is electrically connected to the PLC electric control system, and a liquid level warning is issued when the liquid level in the tank is lower than the preset threshold.

[0007] Preferably, the liquid extraction pipeline is connected to the liquid extraction port of the nitric acid tank. An electric fluorine-lined butterfly valve I, a metering pipeline, and a check valve are successively provided on the liquid extraction pipeline. A metering pipeline is provided in front of the electric fluorine-lined butterfly valve I. The metering pipeline includes: a gate valve I, a metering pump, and an electric fluorine-lined butterfly valve II. A gate valve II and a damper II are provided between the metering pump and the electric fluorine-lined butterfly valve II. A spare pipeline is provided on the metering pipeline. The two metering pipelines are connected above and a damper I and a pressure relief pipeline are provided at the connection position. The electric fluorine-lined butterfly valve I and the electric fluorine-lined butterfly valve II are electrically connected to the PLC electric control system.

[0008] Preferably, a safety valve is provided on the pressure relief pipeline, and the pressure relief pipeline is connected to the return liquid port.

[0009] Preferably, a voltage stabilizing device is provided at the front end of the liquid extraction pipeline. The voltage stabilizing device is made of C4 steel and is lined with an anti-corrosion coating. A return acid pipeline is provided below the voltage stabilizing device. The return acid pipeline is provided with an electric fluorine-lined butterfly valve III, and the tail end of the return acid pipeline is connected to the front-end pipeline of the electric fluorine-lined butterfly valve I. The voltage stabilizing device is connected to a mixer through a pipeline. The drain port of the mixer is connected to a mixing tank. The electric fluorine-lined butterfly valve III is electrically connected to the PLC electric control system.

[0010] Preferably, the PLC electric control system controls the opening of the electric fluorine-lined butterfly valve II, so that nitric acid flows into the front end of the electric fluorine-lined butterfly valve I of the liquid extraction pipeline along the return acid pipeline. The PLC electric control system simultaneously controls the opening of the electric fluorine-lined butterfly valve III and the electric fluorine-lined butterfly valve I and the operation of the metering pump to extract acid liquid.

[0011] Preferably, the PLC electric control system controls the pressure pump to pressurize the nitric acid tank. After the acid liquid extraction is completed, the PLC electric control system controls the safety valve to open, so that the acid liquid in the upper pipeline flows back into the nitric acid tank.

[0012] The beneficial effects of the present utility model are as follows:

[0013] Compared with the prior art, the present utility model has the following advantages:

[0014] 1. Compared with the traditional method that requires additional liquid injection into the pump, the present utility model sets a voltage stabilizing device and a return acid pipeline, so that the nitric acid remaining in the voltage stabilizing device reaches the front-end pipeline of the electric fluorine-lined butterfly valve I along the return acid pipeline, eliminating the need for additional liquid injection into the pump, enabling the metering pump to stably output, and ensuring the stability of nitric acid liquid output.

[0015] 2. Compared with the traditional method that requires manual addition of liquid to the metering pump, the utility model realizes automatic control of nitric acid extraction through the PLC electric control system, precise control of the speed and extraction time, making the subsequent pH adjustment operation of the acid preparation solution more delicate and accurate, improving production efficiency, reducing manual participation, and enhancing production safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 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 efforts.

[0017] Figure 1 It is a schematic flow chart of the concentrated nitric acid liquid extraction device;

[0018] Figure 2 It is a partial schematic diagram of the liquid extraction pipeline in the concentrated nitric acid liquid extraction device;

[0019] Figure 3 It is a partial flow chart of the nitric acid tank in the concentrated nitric acid liquid extraction device;

[0020] Figure 4 It is a schematic opening flow chart of the concentrated nitric acid liquid extraction device;

[0021] Figure 5 It is a schematic closing flow chart of the concentrated nitric acid liquid extraction device;

[0022] In the figure: 1, pressure pump; 2, nitric acid tank; 201, liquid level gauge; 202, liquid extraction port; 203, return liquid port; 3, liquid extraction pipeline; 4, acid return pipeline; 5, pressure relief pipeline; 6, metering pump; 7, voltage stabilizing device; 8, PLC electric control system; 9, mixer; 10, electric fluorine-lined butterfly valve I; 11, metering pipeline; 12, check valve; 13, gate valve I; 14, electric fluorine-lined butterfly valve II; 15, gate valve II; 16, damper II; 17, damper I; 18, safety valve; 19, electric fluorine-lined butterfly valve III; 20, mixing tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to enable those skilled in the art to better understand the technical solutions of this equipment, the following will further elaborate on this equipment in combination with the drawings and specific embodiments.

[0024] To solve the above technical problems, the utility model provides a concentrated nitric acid liquid extraction device with a voltage stabilizing function, which includes: a pressure pump 1, a nitric acid tank 2, a liquid extraction pipeline 3, a nitric acid return pipeline 4, a pressure relief pipeline 5, a metering pump 6, a voltage stabilizing device 7, a PLC electric control system 8 and a mixer 9. The nitric acid tank 2 is connected to the liquid extraction pipeline 3 and the pressure relief pipeline 5. The liquid extraction pipeline 3 extracts nitric acid from the nitric acid tank 2, and the pressure relief pipeline 5 returns the nitric acid in the pipeline to the nitric acid tank 2. The liquid extraction pipeline 3 is provided with a metering pump 6, a damper and a check valve 12. The liquid extraction pipeline 3 is connected to the voltage stabilizing device 7. A nitric acid return pipeline 4 is arranged below the voltage stabilizing device 7. The voltage stabilizing device 7 stabilizes the pressure of the metering pump 6 in the liquid extraction pipeline 3, and there is no need to add water to the metering pump 6 before use. The output end of the voltage stabilizing device 7 is communicated with the mixer 9, and an alkaline liquid is added to the mixer 9 to mix with nitric acid for adjusting the pH value of the solution. The nitric acid and the alkali solution are evenly mixed through the mixer 9. The adjusted solution is introduced into a mixing tank 20 for an extraction reaction with a waste water solution. The PLC electric control system 8 automatically controls the metering pump 6 and the pressure pump 1.

[0025] In some embodiments, the pressure pump 1 is connected to the nitric acid tank 2. When the pressure in the nitric acid tank 2 is insufficient, the PLC electric control system 8 turns on the pressure pump 1 to pressurize the nitric acid tank 2. An exhaust port 201, a pressure gauge, an acid discharge port, a manhole, a liquid extraction port 202, a liquid return port 203 and a liquid level gauge 201 are sequentially arranged above the nitric acid tank 2. The liquid level gauge 201 is electrically connected to the PLC electric control system 8 to monitor the liquid level of nitric acid in the nitric acid tank 2, and a liquid level warning is issued when the liquid level in the tank is lower than a preset threshold.

[0026] In some embodiments, the liquid extraction pipeline 3 is communicated with the liquid extraction port 202 of the nitric acid tank 2 to extract nitric acid outward. The liquid extraction pipeline 3 is sequentially provided with an electric fluorine-lined butterfly valve I 10, a metering pipeline 11 and a check valve 12. A metering pipeline 11 is arranged in front of the electric fluorine-lined butterfly valve I 10. A gate valve I 13, a metering pump 6 and an electric fluorine-lined butterfly valve II 14 are sequentially arranged on the metering pipeline 11. A gate valve II 15 and a damper II 16 are arranged between the metering pump 6 and the electric fluorine-lined butterfly valve II 14. The gate valve I 13 controls the use of the metering pipeline 11, and the gate valve II 15 controls the use of the damper II 16 in the metering pipeline 11. The damper II 16 reduces the vibration and noise in the metering pipeline 11. The metering pipeline 11 is provided with a spare pipeline. When one metering pipeline 11 fails, the spare metering pipeline 11 is used to replace it without affecting production. The two metering pipelines 11 are connected and communicated above, and a damper I 17 and a pressure relief pipeline 5 are arranged at the connection position. The electric fluorine-lined butterfly valve I 10 and the electric fluorine-lined butterfly valve II 14 are electrically connected to the PLC electric control system 8. The inside of the electric fluorine-lined butterfly valve is lined with polytetrafluoroethylene to improve the corrosion resistance of the butterfly valve.

[0027] In some embodiments, a pressure stabilizing device 7 is provided at the front end of the liquid extraction pipeline 3. The pressure stabilizing device 7 is made of C4 steel and is lined with an anti-corrosion coating. A nitric acid return pipeline 4 is provided below the pressure stabilizing device 7. The nitric acid return pipeline 4 is provided with an electric fluorine-lined butterfly valve III 19, and the tail end of the nitric acid return pipeline 4 is connected to the pipeline in front of the electric fluorine-lined butterfly valve I 10, so that nitric acid can flow back into the pipeline in front of the electric fluorine-lined butterfly valve I 10. The electric fluorine-lined butterfly valve III 19 is electrically connected to the PLC electric control system 8. When the metering pump 6 starts to operate and extract liquid normally, the PLC electric control system 8 closes the electric fluorine-lined butterfly valve III 19. The pressure stabilizing device 7 is connected to a mixer 9 through a pipeline. The nitric acid solution flows into the mixer 9 and is mixed with the alkali solution. When the predetermined pH value is reached, the drain port of the mixer 9 is connected to the mixing tank 20 to discharge the adjusted solution into the mixing tank 20.

[0028] In some embodiments, the PLC electric control system 8 controls the electric fluorine-lined butterfly valve II 14 to open, so that nitric acid flows along the nitric acid return pipeline 4 into the pipeline in front of the electric fluorine-lined butterfly valve I 10 of the liquid extraction pipeline 3. The PLC electric control system 8 simultaneously controls the electric fluorine-lined butterfly valve III 19, the electric fluorine-lined butterfly valve I 10 to open and the metering pump 6 to work to extract acid liquid. When the liquid level in the nitric acid tank 2 is relatively low and the amount of nitric acid liquid extracted by the metering pump 6 is insufficient, the PLC electric control system 8 controls the pressure boosting pump 1 to pressurize the nitric acid tank 2. When the extraction of acid liquid is completed, the PLC electric control system 8 controls the safety valve 18 to open, so that the acid liquid in the upper pipeline flows back into the nitric acid tank 2.

[0029] Embodiment

[0030] In a specific embodiment provided by the present utility model, as Figures 1-5 shown, in the initial state, the electric fluorine-lined butterfly valve I 10, the electric fluorine-lined butterfly valve II 14, the electric fluorine-lined butterfly valve III 19 and the metering pump 6 are in the closed state. When it is necessary to extract nitric acid from the nitric acid tank 2, first, the operating power and operating time of the metering pump 6 are adjusted in the PLC electric control system 8. The electric fluorine-lined butterfly valve II 14 is opened through the PLC electric control system 8. The residual nitric acid solution in the pressure stabilizing device 7 flows into the pipeline position in front of the electric fluorine-lined butterfly valve I 10 through the nitric acid return pipeline 4. The PLC electric control system 8 controls the opening of the electric fluorine-lined butterfly valve I 10 and the electric fluorine-lined butterfly valve III 19, and at the same time, the metering pump 6 is started, so that the metering pump 6 starts to work to extract the nitric acid solution from the nitric acid tank 2. The electric fluorine-lined butterfly valve II 14 is closed to stop the reflux of the nitric acid solution in the nitric acid return pipeline 4. When the liquid level in the nitric acid tank 2 is relatively low during the extraction of the nitric acid solution, the pressure boosting pump 1 is started to pressurize the nitric acid tank 2 to assist the metering pump 6 to extract nitric acid.

[0031] After the extraction of nitric acid is completed, the PLC electric control system 8 controls the metering pump 6 to close. Then, the PLC electric control system 8 controls the electric fluorine-lined butterfly valve I 10 and the electric fluorine-lined butterfly valve III 19 to close. At the same time, the safety valve 18 is opened, so that the nitric acid above the safety valve 18 flows back into the nitric acid tank 2 along the pressure relief pipeline 5. At this time, when the nitric acid level in the nitric acid tank 2 is too low, a low-level alarm is issued to remind the operator to add nitric acid solution.

Claims

1. A concentrated nitric acid liquid extraction device with a voltage stabilizing function, characterized in that: include: A booster pump, a nitric acid tank, a liquid intake pipeline, an acid return pipeline, a pressure relief pipeline, a metering pump, a voltage stabilizer, a PLC electronic control system and a mixer; the nitric acid tank is connected to the liquid intake pipeline and the pressure relief pipeline, the liquid intake pipeline is provided with a metering pump, a damper and a check valve, the liquid intake pipeline is connected to the voltage stabilizer, an acid return pipeline is provided below the voltage stabilizer, the output end of the voltage stabilizer is connected to the mixer, an alkaline liquid is added to the mixer to mix with nitric acid to adjust the pH value of the solution, the adjusted solution is passed into a mixing tank to perform extraction reaction with the wastewater solution, and the PLC electronic control system automatically controls the metering pump and the booster pump.

2. The concentrated nitric acid liquid extraction device with a voltage stabilizing function according to claim 1, characterized in that: The booster pump is connected to the nitric acid tank, and an exhaust port, a pressure gauge, an acid discharge port, an inlet hole, a liquid extraction port, a liquid return port and a liquid level meter are sequentially arranged above the nitric acid tank. The liquid level meter is electrically connected to the PLC electronic control system, and a liquid level warning is issued when the liquid level in the tank is lower than a preset threshold.

3. The concentrated nitric acid liquid extraction device with a voltage stabilizing function according to claim 1, characterized in that: The liquid extraction pipeline is connected with the liquid extraction port of the nitric acid tank, and is provided with an electric fluorine-lined butterfly valve 1, a metering pipeline and a check valve in sequence on the liquid extraction pipeline. A metering pipeline is provided in front of the electric fluorine-lined butterfly valve 1, and a gate valve 1, a metering pump and an electric fluorine-lined butterfly valve 2 are provided on the metering pipeline in sequence. A gate valve 2 and a damper 2 are provided between the metering pump and the electric fluorine-lined butterfly valve 2. A spare pipeline is provided on the metering pipeline. The two metering pipelines are connected above, and a damper 1 and a pressure relief pipeline are provided at the connecting position. The electric fluorine-lined butterfly valve 1 and the electric fluorine-lined butterfly valve 2 are electrically connected to the PLC electronic control system.

4. The concentrated nitric acid liquid extraction device with a voltage stabilizing function according to claim 1, characterized in that: The pressure relief pipeline is provided with a safety valve, and the pressure relief pipeline is connected with the liquid return port.

5. The concentrated nitric acid liquid extraction device with a voltage stabilizing function according to claim 1, characterized in that: A pressure stabilizing device is provided at the front end of the liquid extraction pipeline. The pressure stabilizing device is made of C4 steel and the inner lining is provided with an anti-corrosion coating. An acid return pipeline is provided below the pressure stabilizing device. The acid return pipeline is provided with an electric fluorine-lined butterfly valve three and the tail end of the acid return pipeline is connected to the front end pipeline of the electric fluorine-lined butterfly valve one. The pressure stabilizing device is connected to a mixer through a pipeline. The mixer discharge port is connected to a mixing tank. The electric fluorine-lined butterfly valve three is electrically connected to a PLC electronic control system.

6. The concentrated nitric acid liquid extraction device with a voltage stabilizing function according to claim 1, characterized in that: The PLC electronic control system controls the opening, so that nitric acid flows along the acid return pipeline into the front end of the electric fluorine-lined butterfly valve 1 in the liquid intake pipeline. The PLC electronic control system simultaneously controls the opening of the electric fluorine-lined butterfly valve 3 and the electric fluorine-lined butterfly valve 1 and the operation of the metering pump to extract the acid liquid.

7. The concentrated nitric acid liquid extraction device with a voltage stabilizing function according to claim 1, characterized in that: The PLC electronic control system controls the pressure pump to pressurize the nitric acid tank. When the extraction of acid liquid is completed, the PLC electronic control system controls the safety valve to open, so that the acid liquid in the upper pipeline flows back into the nitric acid tank.

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