Foam-containing pit liquid level measuring device and measuring method

Abstract

The invention discloses a foam-containing pit liquid level measuring device and method.The foam-containing pit liquid level measuring device comprises a sensor, a mounting frame, a stirrer and a storage bin, the mounting frame is fixed above a liquid collecting pool, the sensor, a speed reducer and a feeder are sequentially arranged on the mounting frame from left to right, and a stirring motor is connected to the upper portion of the speed reducer; a stirrer is arranged at the bottom of the speed reducer and extends into waste liquid; the sensor transmits collected signals to the signal processing unit, and the signal processing unit controls the stirring motor, the feeding machine and the pneumatic stop valve after data processing. A defoaming agent is accommodated in the storage bin, and is conveyed into the liquid collecting tank through being communicated with the feeder; the sensor and the signal processing unit are arranged to continuously monitor the real liquid level and the foam height so as to timely discover abnormity and take measures, and automatic control is beneficial to reduction of personal errors, improvement of production efficiency and product quality, reduction of equipment damage and waste water overflow and reduction of environmental pollution.

Description

Technical Field

[0001] The invention relates to the field of liquid level measurement, and in particular to a device and method for measuring the liquid level of a pit containing foam. Background Art

[0002] Coal-fired thermal power units have been developed towards large capacity and high parameters. Flue gas desulfurization and denitrification must also meet the national environmental protection ultra-low emission requirements. As a result, the accuracy of liquid level measurement in the flue gas desulfurization system also puts forward higher standards. At present, due to the wet desulfurization in the desulfurization system, limestone slurry is used to treat the sulfur in the flue gas. When treating the waste liquid, a large number of pit-type waste liquid pools are used. During the liquid level measurement process of the pit-type waste liquid pool, the measured liquid level jumps and dead numbers are caused due to the installation position and method. The frequent start and stop of the equipment makes it impossible for the operator to adjust the supply and discharge of the limestone slurry, affecting the economic operation of the desulfurization system. The current liquid level measurement is usually measured manually with a ruler. The measurement process is cumbersome and the measurement is inaccurate. When using a liquid level meter, it is often damaged due to water ingress.

[0003] After searching, the patent with application number CN202211496918.0 discloses a pit liquid level measuring device, including a water intake unit, which includes a water intake cylinder, a screen is arranged at the lower end of the water intake cylinder, and a reflector is arranged at the upper end of the water intake cylinder; the supporting unit includes a floating plate located in the water intake cylinder, the floating plate is provided with a spherical groove, a sphere is arranged in the spherical groove, a connecting seat is arranged on one side of the sphere, and a connecting rod is arranged on the other side of the sphere, and the connecting rod is connected to a weight-bearing part; the clamping unit includes a clamping cylinder connected to the connecting seat and a mounting seat connected to the clamping cylinder; the measuring unit is a distance sensor, which is fixedly connected to the mounting seat; by installing the measuring unit in the water intake unit, it is easy to use, and the mounting structure of the measuring unit is ingenious, and the measuring accuracy of the measuring unit can be fine-tuned to ensure accurate measurement accuracy.

[0004] However, there are many liquid collection tanks at the production site to collect waste liquid in the production process. At the same time, the waste liquid will produce a lot of foam, causing false water level, which has an adverse effect on the production process control. The use of ultrasonic level meters can only measure the liquid level with foam due to the influence of foam, and cannot measure the real liquid level, causing the drainage equipment to run idle and damage the equipment; using a float level meter, it is impossible to measure the height of the foam, causing the liquid collection tank to overflow and cause environmental pollution.

[0005] Therefore, we urgently need a foam-containing pit level measuring device and method to measure the actual water level, and at the same time provide foam warning to better eliminate the hidden dangers of equipment damage caused by the drainage pump running dry. Summary of the invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides a foam-containing pit liquid level measuring device and a measuring method.

[0007] The technical solution of the present invention is as follows:

[0008] A device for measuring the liquid level of a pit containing foam comprises a sensor, a mounting frame, an agitator and a storage bin. The mounting frame is fixed above a liquid collecting tank. A sensor, a reducer and a feeder are arranged on the mounting frame from left to right in sequence. A stirring motor is connected above the reducer. An agitator is arranged at the bottom of the reducer and extends to the inside of the waste liquid. The sensor transmits the collected signal to a signal processing unit, and the signal processing unit controls the stirring motor, the feeder and a pneumatic stop valve after data processing. The pneumatic stop valve is arranged at the outlet of the storage bin, and the storage bin is installed above the feeder. A defoaming agent is placed in the storage bin, which is connected to the feeder and then transported to the liquid collecting tank.

[0009] Preferably, the sensor includes an ultrasonic unit and a radar unit. The ultrasonic unit emits ultrasonic waves to detect the distance of the waste liquid plus foam, and the radar unit emits radar to detect the distance of the waste liquid. The sensor then transmits the collected signals to the signal processing unit for processing.

[0010] Preferably, the feeder is provided with a discharge pipe extending to the bottom of the mounting frame to maintain communication with the interior of the liquid collecting tank.

[0011] Preferably, a manual stop valve is also provided at the outlet of the storage bin, and the manual stop valve is located below the pneumatic stop valve.

[0012] Preferably, a nozzle is installed at the port of the discharge pipe.

[0013] Preferably, a circulation device is also provided on the mounting frame, the circulation device includes a circulation pump, a suction pipe and a return pipe, the suction pipe and the return pipe are connected to the interior of the liquid collecting tank and extend into the waste liquid, the discharge pipe of the feeder is connected to the side wall of the return pipe, and a one-way valve is arranged on the discharge pipe.

[0014] Preferably, an acid-base balance device is also provided on the mounting frame, and the acid-base balance device includes a neutralizing liquid storage bin located above the mounting frame, an acid-base neutralization pipe is installed at the discharge end of the neutralizing liquid storage bin, extends to the interior of the liquid collecting tank and then connects to the side wall of the return pipe, and a one-way valve is installed on the acid-base neutralization pipe; the interior of the neutralizing liquid storage bin includes two isolated and independent chambers for storing acidic neutralizing liquid and alkaline neutralizing liquid respectively; solenoid valve A and solenoid valve B are symmetrically provided on the discharge end of the neutralizing liquid storage bin.

[0015] Preferably, a pH sensor is provided on the mounting frame for measuring the pH value in the waste liquid. The pH sensor is electrically connected to the signal processing unit, and the signal processing unit is electrically connected to the solenoid valve A and the solenoid valve B.

[0016] A method for measuring a pit liquid level measuring device containing foam, comprising the following steps:

[0017] Signal processing steps: first, fix the mounting frame above the liquid collecting tank, and set the sensor, reducer and feeder on the mounting frame from left to right in sequence, then electrically connect the sensor to the signal processing unit, and the signal processing unit is also connected to control the stirring motor, feeder and pneumatic stop valve respectively. The ultrasonic unit and radar unit in the sensor simultaneously transmit and receive ultrasonic pulses and radar pulses, respectively measure the distance from the waste liquid in the liquid collecting tank to the sensor and the distance from the foam surface to the sensor, calculate the height of the foam, and then transmit the signal to the signal processing unit for data processing to control the start of the stirring motor, feeder and pneumatic stop valve;

[0018] Defoaming step A: After the stirring motor is started, the stirrer will be driven to rotate in the waste liquid to perform defoaming. At the same time, the defoaming agent is installed in the storage bin, and the defoaming agent is input into the liquid collection tank through the control of the pneumatic stop valve and the manual stop valve to perform defoaming.

[0019] Defoaming step B: After the stirring motor is started, the stirrer will be driven to rotate in the waste liquid. Then, the circulating pump in the circulation device will extract the waste liquid through the suction pipe, and then the defoaming agent will be discharged into the return pipe, so that the defoaming agent will flow back to the waste liquid layer below along with the waste liquid in the pipeline, thereby performing defoaming. At the same time, the defoaming agent is installed in the storage bin, and the defoaming agent is input through the pneumatic stop valve and the manual stop valve.

[0020] Acid-base neutralization step: After the signal processing unit receives the signal from the pH sensor, it processes the data and controls the solenoid valve A or solenoid valve B to open or close, and transports the acidic neutralization liquid or alkaline neutralization liquid in the neutralization liquid storage tank to the return pipe through the acid-base neutralization pipeline and flows back to the waste liquid layer together with the extracted waste liquid.

[0021] The present invention has the following beneficial effects:

[0022] 1. The present invention continuously monitors the real liquid level and foam height by setting sensors and signal processing units. The signal processing unit can control the stirring motor, feeder and pneumatic stop valve to timely detect abnormalities and take measures. Defoaming agent can be added in time while stirring to accelerate the disappearance of foam. At the same time, automated control is conducive to reducing human errors, improving production efficiency and product quality, reducing equipment damage and wastewater overflow, and reducing environmental pollution.

[0023] 2. The present invention also adds a circulation device, which can directly mix the defoaming agent into the extracted circulating waste liquid, so as to achieve a better defoaming effect and more complete mixing. In addition, because some defoaming agents will change the pH value of the waste liquid after use, a pH sensor is added to monitor the pH value of the waste liquid. After the pH sensor transmits the signal to the signal processing unit, the signal processing unit controls the opening or closing of the solenoid valve A or the solenoid valve B according to the information data to release the acidic neutralizing liquid or alkaline neutralizing liquid in the neutralizing liquid storage tank and transport it to the waste liquid for neutralization, so that the present device can be applied to foam monitoring under different chemical properties and physical conditions, and effectively prevent overflow and other problems caused by excessive foam. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0025] Figure 2 is a control flow chart of a signal processing unit of the present invention;

[0026] Figure 3 This is a schematic diagram of the overall device structure of Example 2 of the present invention;

[0027] Figure 4 This is a schematic diagram of the overall device structure of Example 3 of the present invention;

[0028] Figure 5 Schematic diagram of the overall device structure of Example 4 of the present invention.

[0029] The reference numerals in the figure are as follows:

[0030] 1. Sensor; 101. Ultrasonic unit; 102. Radar unit; 2. Signal processing unit; 3. Stirring motor; 4. Reducer; 5. Stirrer; 6. Mounting frame; 7. Discharge pipe; 8. Storage bin; 9. Defoamer; 10. Pneumatic stop valve; 11. Manual stop valve; 12. Feeder; 13. Liquid collecting tank; 14. Foam; 15. Waste liquid; 16. Nozzle; 17. Suction pipe; 18. Circulation pump; 19. Check valve; 20. Return pipe; 21. PH value sensor; 22. Acid-base neutralization pipeline; 23. Neutralization liquid storage bin; 24. Acidic neutralization liquid; 25. Alkaline neutralization liquid; 26. Solenoid valve A; 27. Solenoid valve B. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1

[0033] See also Figure 1 and Figure 2 A foam-containing pit liquid level measuring device comprises a sensor 1, a mounting frame 6, an agitator 5 and a storage bin 8. The mounting frame 6 is fixed above a liquid collecting pool 13. The sensor 1, a reducer 4 and a feeder 12 are arranged on the mounting frame 6 from left to right in sequence. A stirring motor 3 is connected above the reducer 4. An agitator 5 is arranged at the bottom of the reducer 4 and extends to the inside of the waste liquid 15. The sensor 1 transmits the collected signal to a signal processing unit, and the signal processing unit controls the stirring motor 3, the feeder 12 and the pneumatic stop valve 10 after data processing. The pneumatic stop valve 10 is arranged at the outlet of the storage bin 8. A manual stop valve 11 is also arranged at the outlet of the storage bin 8, and the manual stop valve 11 is located below the pneumatic stop valve 10. The storage bin 8 is installed above the feeder 12. A defoaming agent 9 is placed in the storage bin 8, which is then transported to the liquid collecting pool 13 by connecting to the feeder 12. A discharge pipe 7 is arranged on the feeder 12 and extends to the bottom of the mounting frame 6 to maintain communication with the inside of the liquid collecting pool 13.

[0034] The sensor 1 includes an ultrasonic unit 101 and a radar unit 102. The ultrasonic unit 101 emits ultrasonic waves to detect the distance of the waste liquid 15 plus the foam 14, and the radar unit emits radar to detect the distance of the waste liquid 15. Then the sensor 1 transmits the collected signals to the signal processing unit for processing.

[0035] Example 2

[0036] See also Figure 3 This embodiment has all the structures of the above embodiments, except that a nozzle 16 is installed at the port of the early discharge pipe 7 for spraying and adding the defoaming agent 9, which has a larger coverage area and is beneficial to the defoaming effect.

[0037] Example 3

[0038] See also Figure 4, this embodiment has all the contents of embodiment 1, except that a circulation device is further provided on the mounting frame 6, the circulation device includes a circulation pump 18, a water pumping pipe 17 and a water return pipe 20, the water pumping pipe 17 and the water return pipe 20 are connected to the inside of the liquid collecting pool 13 and extend to the inside of the waste liquid 15, the discharge pipe 7 of the feeder 12 is connected to the side wall of the water return pipe 20, and a one-way valve 19 is provided on the discharge pipe 7; in the previous embodiment, the defoaming agent 9 is discharged from the discharge pipe 7 and directly falls on the foam layer of the water pool. When the viscosity of the foam layer is large and the foam is relatively dense, the efficiency of the defoaming agent 9 entering the waste liquid layer 15 below is affected, and then the efficiency of the dilution and diffusion of the defoaming agent 9 is affected. This delay phenomenon can easily cause the sensor to misjudge the current foam thickness; therefore, in this embodiment, the defoaming agent 9 is no longer discharged directly to the top of the foam layer, but after the waste liquid 15 is extracted through the suction pipe 17, the defoaming agent 9 is discharged into the return pipe 20, and follows the waste liquid 15 in the pipeline to flow back to the waste liquid 15 layer below, thereby solving the above problem.

[0039] Example 4

[0040] See also Figure 5 This embodiment has all the contents of the embodiment 1 and the embodiment 3, except that the mounting frame 6 is further provided with an acid-base balance device, which includes a neutralizing liquid storage bin 23 located above the mounting frame 6, an acid-base neutralization pipe 22 is installed at the discharge end of the neutralizing liquid storage bin 23, and extends to the inside of the liquid collecting tank 13 and then connects to the side wall of the return pipe 20, and a one-way valve 19 is installed on the acid-base neutralization pipe 22; the neutralizing liquid storage bin 23 includes two isolated and independent chambers for storing the acidic neutralizing liquid 24 and the alkaline neutralizing liquid 25 respectively; the neutralizing liquid storage bin 23 is symmetrically provided with a solenoid valve A26 and a solenoid valve B27; further, the mounting frame 6 is provided with a pH sensor 21 for measuring the pH value in the waste liquid 15, the pH sensor 21 is electrically connected to the signal processing unit 2, and the signal processing unit 2 is electrically connected to the solenoid valve A26 and the solenoid valve B27. Because some defoaming agents 9 will affect the pH value of the waste liquid 15 after use. Therefore, in this embodiment, in order to neutralize and adjust the imbalance of the pH value of the waste liquid 15 after defoaming, an acid-base neutralization pipeline 22 is added to the return pipe 20, and the input end of the acid-base neutralization pipeline 22 is respectively connected to the acid neutralization chamber and the alkaline neutralization chamber of the neutralization liquid storage tank 23 through a three-way valve, and the solenoid valve A26 and the solenoid valve B27 are respectively arranged below the acid neutralization chamber and the alkaline neutralization chamber. At the same time, a pH sensor 21 is also arranged on the mounting frame 6, and the detection end of the pH sensor 21 is deep under the liquid surface of the waste liquid 15. When working, the pH value of the waste liquid is detected and fed back to the signal processing unit 2 in the form of an electrical signal. The signal processing unit 2 controls the solenoid valve A26 or the solenoid valve B27 to open according to the feedback detection signal to inject the acid neutralization liquid 24 or the alkaline neutralization liquid 25 into the return pipe 20 until the pH detection value returns to the standard value. Thus, the above problems are solved.

[0041] A method for measuring a pit liquid level measuring device containing foam, comprising the following steps:

[0042] Signal processing steps: first, fix the mounting frame 6 above the liquid collecting pool 13, and sequentially set the sensor 1, the reducer 4 and the feeder 12 on the mounting frame 6 from left to right, and then electrically connect the sensor 1 to the signal processing unit, which is also connected to control the stirring motor 3, the feeder 12 and the pneumatic stop valve 10 respectively. The ultrasonic unit 101 and the radar unit 102 in the sensor 1 simultaneously transmit and receive ultrasonic pulses and radar pulses, respectively measure the distance from the waste liquid 15 in the liquid collecting pool 13 to the sensor 1 and the distance from the surface of the foam 14 to the sensor 1, calculate the height of the foam 14, and then transmit the signal to the signal processing unit for data processing to control the start of the stirring motor 3, the feeder 12 and the pneumatic stop valve 10;

[0043] Defoaming step A: After the stirring motor 3 is started, the stirrer 5 is driven to rotate in the waste liquid 15 to perform defoaming. At the same time, the defoaming agent 9 is installed in the storage bin 8, and the defoaming agent 9 is input into the liquid collecting tank 13 through the control of the pneumatic stop valve 10 and the manual stop valve 11 to perform defoaming.

[0044] Defoaming step B: After the stirring motor 3 is started, the stirrer 5 is driven to rotate in the waste liquid 15, and then the circulating pump 18 in the circulation device extracts the waste liquid 15 through the pumping pipe 17, and then the defoaming agent 9 is discharged into the return pipe 20, so that the defoaming agent 9 follows the waste liquid 15 in the pipeline and flows back to the waste liquid 15 layer below, thereby performing defoaming. At the same time, the defoaming agent 9 is installed in the storage bin 8, and the defoaming agent 9 is input through the pneumatic stop valve 10 and the manual stop valve 11;

[0045] Acid-base neutralization step: After the signal processing unit receives the signal from the pH sensor 21, it processes the data and controls the solenoid valve A26 or the solenoid valve B27 to open or close, and transports the acidic neutralization liquid 24 or the alkaline neutralization liquid 25 in the neutralization liquid storage tank 23 to the return pipe 20 through the acid-base neutralization pipeline 22 and flows back to the waste liquid 15 layer together with the extracted waste liquid 15.

[0046] Working principle of the present invention:

[0047] In the present invention, first, a mounting frame 6 is fixed above the liquid collecting pool 13, and a sensor 1, a reducer 4 and a feeder 12 are arranged on the mounting frame 6 from left to right in sequence, and then the sensor 1 is electrically connected to a signal processing unit, and the signal processing unit is also connected to control the stirring motor 3, the feeder 12 and the pneumatic stop valve 10 respectively. The ultrasonic unit 101 and the radar unit 102 in the sensor 1 simultaneously transmit and receive ultrasonic pulses and radar pulses, respectively measure the distance from the waste liquid 15 in the liquid collecting pool 13 to the sensor 1 and the distance from the surface of the foam 14 to the sensor 1, calculate the height of the foam 14, and then transmit the signal to the signal processing unit for data processing to control the start of the stirring motor 3, the feeder 12 and the pneumatic stop valve 10.

[0048] After starting the stirring motor 3, the stirrer 5 will be driven to rotate in the waste liquid 15 to perform defoaming. At the same time, a defoaming agent 9 is installed in the storage bin 8, and the defoaming agent 9 is input into the liquid collection tank 13 through the control of the pneumatic stop valve 10 and the manual stop valve 11 to perform defoaming.

[0049] At the same time, a nozzle 16 can be installed at the outlet of the discharge pipe 7 for spraying and adding the defoaming agent 9, which can increase the coverage area of ​​the defoaming agent 9 and is beneficial to the defoaming effect.

[0050] It is also possible to use a dynamic stirring motor 3 to drive the stirrer 5 to rotate in the waste liquid 15, and then the circulating pump 18 in the circulation device will extract the waste liquid 15 through the suction pipe 17, and then discharge the defoaming agent 9 into the return pipe 20, so that the defoaming agent 9 follows the waste liquid 15 in the pipeline and flows back to the waste liquid 15 layer below, thereby performing defoaming. At the same time, the defoaming agent 9 is installed in the storage bin 8, and the defoaming agent 9 is input through the pneumatic stop valve 10 and the manual stop valve 11. After being discharged from the discharge pipe 7, the defoaming agent 9 falls directly on the foam layer of the pool. When the viscosity of the foam layer is high and the foam is relatively dense, the efficiency of the defoaming agent 9 entering the waste liquid layer 15 below is affected, thereby affecting the efficiency of the dilution and diffusion of the defoaming agent 9. This delay phenomenon can easily cause the sensor to misjudge the current foam thickness. Therefore, in this embodiment, the defoaming agent 9 is no longer discharged directly to the top of the foam layer. Instead, after the waste liquid 15 is extracted through the suction pipe 17, the defoaming agent 9 is discharged into the return pipe 20, and follows the waste liquid 15 in the pipeline to flow back to the waste liquid 15 layer below, thereby solving the above problem.

[0051] At the same time, after receiving the signal from the pH sensor 21 through the signal processing unit, the solenoid valve A26 or the solenoid valve B27 can be controlled to open or close after processing the data, so that the acidic neutralizing liquid 24 or the alkaline neutralizing liquid 25 in the neutralizing liquid storage tank 23 can be transported to the return pipe 20 through the acid-base neutralization pipeline 22 and flow back to the waste liquid 15 layer together with the extracted waste liquid 15; in order to neutralize and adjust the imbalance of the pH value of the waste liquid 15 after defoaming, an acid-base neutralization pipeline 22 is added to the return pipe 20, and the input end of the acid-base neutralization pipeline 22 is respectively connected to the neutralizing liquid storage tank 23 through a three-way valve. The acidic neutralization chamber and alkaline neutralization chamber are respectively provided with electromagnetic valve A26 and electromagnetic valve B27 below the acidic neutralization chamber and alkaline neutralization chamber. Meanwhile, a pH sensor 21 is also provided on the mounting frame 6, and the detection end of the pH sensor 21 is deeply below the liquid surface of the waste liquid 15. When working, the pH value of the waste liquid is detected and fed back to the signal processing unit 2 in the form of an electrical signal. The signal processing unit 2 controls the electromagnetic valve A26 or the electromagnetic valve B27 to open and inject the acidic neutralization liquid 24 or the alkaline neutralization liquid 25 into the return pipe 20 according to the feedback detection signal, until the pH detection value returns to the standard value. Thus, the above problems are solved.

[0052] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A device for measuring the liquid level of a pit containing foam, comprising a sensor (1), a mounting frame (6), an agitator (5) and a storage bin (8), characterized in that: The mounting frame (6) is fixed above the liquid collecting tank (13), and a sensor (1), a reducer (4) and a feeder (12) are arranged on the mounting frame (6) from left to right in sequence. A stirring motor (3) is connected to the top of the reducer (4), and a stirrer (5) is arranged at the bottom of the reducer (4) and extends into the waste liquid (15); the sensor (1) transmits the collected signal to the signal processing unit, and the signal processing unit controls the stirring motor (3), the feeder (12) and the pneumatic stop valve (10) after data processing; the pneumatic stop valve (10) is arranged at the outlet of the storage bin (8), and the storage bin (8) is installed above the feeder (12). The storage bin (8) contains a defoaming agent (9), which is connected to the feeder (12) and then transported to the liquid collecting tank (13).

2. A foam-containing pit liquid level measuring device according to claim 1, characterized in that: The sensor (1) comprises an ultrasonic unit (101) and a radar unit (102). The ultrasonic unit (101) emits ultrasonic waves to detect the distance between the waste liquid (15) and the foam (14), and the radar unit emits radar to detect the distance between the waste liquid (15). The sensor (1) then transmits the collected signals to the signal processing unit for processing.

3. A foam-containing pit liquid level measuring device according to claim 1, characterized in that: The feeder (12) is provided with a discharge pipe (7) extending to the bottom of the mounting frame (6) to maintain communication with the interior of the liquid collecting tank (13).

4. A foam-containing pit liquid level measuring device according to claim 1, characterized in that: A manual stop valve (11) is also provided at the outlet of the storage bin (8), and the manual stop valve (11) is located below the pneumatic stop valve (10).

5. A foam-containing pit liquid level measuring device according to claim 3, characterized in that: A nozzle (16) is installed at the end of the discharge pipe (7).

6. A foam-containing pit liquid level measuring device according to claim 1, characterized in that: The mounting frame (6) is also provided with a circulation device, which includes a circulation pump (18), a water suction pipe (17) and a water return pipe (20). The water suction pipe (17) and the water return pipe (20) are connected to the inside of the liquid collecting tank (13) and extend to the inside of the waste liquid (15). The discharge pipe (7) of the feeder (12) is connected to the side wall of the water return pipe (20), and a one-way valve (19) is provided on the discharge pipe (7).

7. A foam-containing pit liquid level measuring device according to claim 6, characterized in that: The mounting frame (6) is also provided with an acid-base balancing device, the acid-base balancing device comprising a neutralizing liquid storage bin (23) located above the mounting frame (6); an acid-base neutralizing pipe (22) is installed at the discharge end of the neutralizing liquid storage bin (23) and extends to the inside of the liquid collecting tank (13) and then communicates with the side wall of the return pipe (20); a one-way valve (19) is installed on the acid-base neutralizing pipe (22); the neutralizing liquid storage bin (23) comprises two isolated and independent chambers for storing the acidic neutralizing liquid (24) and the alkaline neutralizing liquid (25) respectively; and a solenoid valve A (26) and a solenoid valve B (27) are symmetrically provided on the discharge end of the neutralizing liquid storage bin (23).

8. A foam-containing pit liquid level measuring device according to claim 7, characterized in that: The mounting frame (6) is provided with a pH sensor (21) for measuring the pH value in the waste liquid (15); the pH sensor (21) is electrically connected to the signal processing unit (2); and the signal processing unit (2) is electrically connected to the solenoid valve A (26) and the solenoid valve B (27).

9. A method for measuring a pit liquid level with foam according to any one of claims 1 to 8, characterized in that: Follow these steps: Signal processing steps: first, a mounting frame (6) is fixed above the liquid collecting pool (13), and a sensor (1), a reducer (4) and a feeder (12) are arranged on the mounting frame (6) from left to right in sequence, and then the sensor (1) is electrically connected to the signal processing unit (2), and the signal processing unit (2) is also connected to control the stirring motor (3), the feeder (12) and the pneumatic stop valve (10), respectively. The ultrasonic unit (101) and the radar unit (102) in the sensor (1) simultaneously transmit and receive ultrasonic pulses and radar pulses, respectively measure the distance from the waste liquid (15) in the liquid collecting pool (13) to the sensor (1) and the distance from the surface of the foam (14) to the sensor (1), calculate the height of the foam (14), and then transmit the signal to the signal processing unit (2) for data processing to control the start of the stirring motor (3), the feeder (12) and the pneumatic stop valve (10); Defoaming step A: After the stirring motor (3) is started, the stirrer (5) is driven to rotate in the waste liquid (15) to perform defoaming. At the same time, a defoaming agent (9) is installed in the storage bin (8). The defoaming agent (9) is input into the liquid collecting tank (13) through the control of the pneumatic stop valve (10) and the manual stop valve (11) to perform defoaming. Defoaming step B: After the stirring motor (3) is started, the stirrer (5) is driven to rotate in the waste liquid (15), and then the circulating pump (18) in the circulation device is used to extract the waste liquid (15) through the water extraction pipe (17), and then the defoaming agent (9) is discharged into the return pipe (20), so that the defoaming agent (9) follows the waste liquid (15) in the pipeline and flows back to the waste liquid (15) layer below, thereby performing defoaming. At the same time, the defoaming agent (9) is installed in the storage bin (8), and the defoaming agent (9) is input through the pneumatic stop valve (10) and the manual stop valve (11); Acid-base neutralization step: After the signal processing unit receives the signal from the pH sensor (21), it processes the data and controls the electromagnetic valve A (26) or the electromagnetic valve B (27) to open or close, and transports the acidic neutralization liquid (24) or alkaline neutralization liquid (25) in the neutralization liquid storage tank (23) through the acid-base neutralization pipeline (22) to the return pipe (20) and flows back to the waste liquid (15) layer together with the extracted waste liquid (15).

Images