An automatic control system for liquid ammonia separator level

Abstract

This utility model belongs to the field of chemical production equipment technology, specifically an automatic liquid level control system for a liquid ammonia separator. It includes a liquid ammonia separator with a sealing cover fixed to its top by bolts. The sealing cover has an air inlet and an air outlet on its left and right sides, respectively. This utility model uses a centrifugal separation component inside the sealing cover, employing a drive motor to rotate the separation filter cartridge at high speed. This generates centrifugal force within the filter cartridge, causing droplets to be intercepted by the filter screen and thrown towards the inner wall of the separation filter cartridge. Simultaneously, a molecular sieve in the outlet cylinder and a microfilter plate at the bottom of the outlet hopper form a multi-stage filtration structure. The molecular sieve adsorbs residual moisture and impurities in the gas. Furthermore, a liquid level adjustment component monitors the liquid level in the separator in real time using an ultrasonic level gauge, transmitting the signal to a PLC control box. After processing by a built-in algorithm, the signal drives an electric valve to dynamically adjust its opening, achieving precise automatic control of the liquid level.

Description

Technical Field

[0001] This utility model relates to the field of chemical production equipment technology, specifically to an automatic control system for liquid ammonia separator level. Background Technology

[0002] In chemical, refrigeration, and other industrial sectors, liquid ammonia is widely used as a key medium in processes such as refrigeration cycles, synthetic ammonia production, and chemical raw material transportation. In these liquid ammonia separation processes, the liquid ammonia separator is a core device that ensures stable system operation, improves energy efficiency, and prevents equipment corrosion. Its performance directly affects the safety, economy, and environmental friendliness of the process.

[0003] Existing liquid ammonia separators mostly rely on gravity settling and baffle plate inertial separation, which have limited efficiency in separating micron-sized droplets. Especially when the gas liquid content is high or the operating conditions fluctuate, problems such as gas entrainment of droplets and incomplete separation can easily occur, leading to damage to downstream equipment. In addition, traditional liquid level control uses mechanical liquid level switches or simple electric valves, which have defects such as response lag and low adjustment accuracy. It is difficult to dynamically adjust the discharge volume according to real-time operating conditions, which may cause safety hazards such as excessively high liquid level leading to flooding or excessively low liquid level leading to gas leakage. To address these issues, we propose an automatic liquid level control system for liquid ammonia separators. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides an automatic liquid level control system for a liquid ammonia separator. By installing a centrifugal separation component inside the sealed cover, a drive motor drives the separation filter cartridge to rotate at high speed, generating centrifugal force within the filter cartridge. Liquid droplets are trapped by the filter screen and thrown towards the inner wall of the separation filter cartridge. Simultaneously, the molecular sieve in the outlet cylinder and the microfilter plate at the bottom of the outlet hopper form a multi-stage filtration structure. Furthermore, the liquid level adjustment component monitors the liquid level in the separator in real time using an ultrasonic level gauge, transmitting the signal to the PLC control box. After processing by a built-in algorithm, the electric valve dynamically adjusts its opening, achieving precise automatic control of the liquid level and solving the problems mentioned earlier.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an automatic liquid level control system for a liquid ammonia separator, comprising a liquid ammonia separator, wherein a sealing cover is fixedly installed on the top of the liquid ammonia separator by bolts, and an air inlet and an air outlet are respectively provided on the left and right sides of the top of the sealing cover. An air inlet cylinder is fixedly connected to the top input end of the air inlet, and a spiral air passage is provided inside the air inlet cylinder. An air inlet pipe is fixedly connected to the top input end of the air inlet cylinder. An air outlet cylinder is fixedly connected to the top output end of the air outlet, and a molecular sieve is provided inside the air outlet cylinder. An air outlet pipe is fixedly connected to the top output end of the air outlet cylinder. A centrifugal separation component is installed on the top inner side of the sealing cover, and a liquid level regulating component is installed between the liquid ammonia separator and the sealing cover.

[0006] Preferably, the centrifugal separation assembly includes a drive motor, which is fixedly installed in the middle of the top side of the sealing cover. A magnetic coupling passes through the middle of the sealing cover, and the output shaft of the drive motor is connected to the top of the magnetic coupling. A connecting box is provided in the middle of the bottom side of the sealing cover, and a mounting bracket is fixedly sleeved on the connecting box. The mounting bracket is fixedly welded to the inner wall of the liquid ammonia separator. A vent is provided on the left side of the connecting box, and the vent and the inlet are fixedly connected by a pipe. A separation filter cartridge is provided at the bottom of the connecting box, and a bearing is sleeved on the top outer surface of the separation filter cartridge. The bearing is installed on the inner bottom side of the connecting box. Support frames are fixedly connected to the top and bottom sides of the inner side of the separation filter cartridge. A rotating rod is fixedly inserted between the two sets of support frames. The top end of the rotating rod extends out of the top side of the connecting box and is connected to the bottom of the magnetic coupling. Several filter screens are also installed on the inner wall of the separation filter cartridge.

[0007] Preferably, the liquid level regulating component includes an ultrasonic liquid level gauge, which is installed on the front side of the sealing cover. The liquid ammonia separator has an outlet in the middle of its bottom side. The output end of the outlet is fixedly connected to a three-way pipe, and the left output end of the three-way pipe is fixedly connected to an electric valve.

[0008] Preferably, a PLC control box is installed on the front side of the liquid ammonia separator.

[0009] Preferably, a temperature sensor is also installed on the front side of the sealing cover.

[0010] Preferably, a pressure transmitter is also installed on the rear side of the sealing cover.

[0011] Preferably, an air outlet bucket is fixedly connected to the bottom input end of the air outlet, and a microfilter plate is fixedly installed on the bottom side inside the air outlet bucket.

[0012] Preferably, the right output end of the three-way pipe is fixedly connected to a manual shut-off valve.

[0013] This invention provides an automatic liquid level control system for a liquid ammonia separator. Compared with the prior art, it has the following advantages:

[0014] 1. This automatic liquid level control system for a liquid ammonia separator uses a centrifugal separation component installed inside the sealed cover. A drive motor drives the separation filter cartridge to rotate at high speed, generating centrifugal force within the cartridge. Liquid droplets are trapped by the filter screen and thrown towards the inner wall of the separation filter cartridge. Combined with the spiral air passage in the inlet cylinder, this guides the airflow to form a swirling flow, further enhancing the centrifugal separation effect. This efficiently removes micron-sized droplets from the gas, significantly improving gas-liquid separation efficiency. Simultaneously, the molecular sieve in the outlet cylinder and the microfilter plate at the bottom of the outlet hopper form a multi-stage filtration structure. The molecular sieve adsorbs residual moisture and impurities in the gas, while the microfilter plate intercepts fine particles, ensuring the cleanliness of the discharged gas and preventing malfunctions in downstream equipment caused by liquid or impurities.

[0015] 2. This automatic liquid level control system for a liquid ammonia separator uses an ultrasonic level gauge to monitor the liquid level in the separator in real time. The signal is transmitted to the PLC control box and processed by the built-in algorithm to drive the electric valve to dynamically adjust the opening, thereby achieving precise automatic control of the liquid level. It can quickly stabilize the liquid level when the operating conditions fluctuate. In addition, the manual shut-off valve on the right side of the three-way pipe serves as an emergency backup channel, which can be manually operated to achieve emergency discharge of liquid ammonia, forming a safety redundancy design with the electric valve. Attached Figure Description

[0016] Figure 1 This is a front view structural diagram of the main body of this utility model;

[0017] Figure 2 This is a schematic diagram of the bottom view of the main body structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the air inlet and air outlet of this utility model;

[0019] Figure 4 This is a schematic diagram of the bottom structure of the sealing cap of this utility model;

[0020] Figure 5 This is a schematic diagram of the centrifugal separation component of this utility model;

[0021] Figure 6 This is a schematic diagram of the cross-sectional structure of the separation filter cartridge of this utility model.

[0022] In the diagram: 1. Liquid ammonia separator; 2. Sealing cover; 3. PLC control box; 4. Air inlet; 5. Air outlet; 6. Air inlet cylinder; 7. Air outlet cylinder; 8. Air inlet pipe; 9. Air outlet pipe; 10. Ultrasonic level gauge; 11. Pressure transmitter; 12. Temperature sensor; 13. Liquid outlet; 14. T-connector; 15. Electric valve; 16. Manual shut-off valve; 17. Spiral air duct; 18. Molecular sieve; 19. Drive motor; 20. Connecting box; 21. Mounting bracket; 22. Air outlet hopper; 23. Microfilter plate; 24. Magnetic coupling; 25. Rotating rod; 26. Air vent; 27. Bearing; 28. Separating filter cartridge; 29. ​​Support frame; 30. Filter screen. Detailed Implementation

[0023] 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.

[0024] Please see Figure 1-6 This utility model provides a technical solution: an automatic liquid level control system for a liquid ammonia separator, including a liquid ammonia separator 1. A sealing cover 2 is fixedly installed on the top of the liquid ammonia separator 1 by bolts. An air inlet 4 and an air outlet 5 are respectively opened on the left and right sides of the top of the sealing cover 2. An air inlet cylinder 6 is fixedly connected to the top input end of the air inlet 4. A spiral air passage 17 is provided inside the air inlet cylinder 6. An air inlet pipe 8 is fixedly connected to the top input end of the air inlet cylinder 6. An air outlet cylinder 7 is fixedly connected to the top output end of the air outlet 5. A molecular sieve 18 is provided inside the air outlet cylinder 7. An air outlet pipe 9 is fixedly connected to the top output end of the air outlet cylinder 7. A centrifugal separation component is installed on the top inner side of the sealing cover 2. A liquid level adjustment component is installed between the liquid ammonia separator 1 and the sealing cover 2.

[0025] When the automatic liquid level control system of the liquid ammonia separator is working, the gas containing liquid ammonia enters the inlet cylinder 6 through the inlet pipe 8, and forms a swirling flow under the guidance of the spiral air passage 17. It then enters the liquid ammonia separator 1 through the inlet port 4. The centrifugal separation component on the inner side of the top of the sealing cover 2 centrifuges the gas containing liquid ammonia, separating the liquid from the gas. The separated liquid remains in the liquid ammonia separator 1, while the gas enters the outlet cylinder 7 through the outlet port 5. After being filtered by the molecular sieve 18 inside the outlet cylinder 7, it is discharged from the outlet pipe 9. The liquid level adjustment component between the liquid ammonia separator 1 and the sealing cover 2 monitors and adjusts the liquid level in the separator, realizing automatic liquid level control.

[0026] The centrifugal separation assembly includes a drive motor 19, which is fixedly mounted on the top center of the sealing cover 2. A magnetic coupling 24 passes through the center of the sealing cover 2, and the output shaft of the drive motor 19 is connected to the top of the magnetic coupling 24. A connecting box 20 is provided on the bottom center of the sealing cover 2, and a mounting bracket 21 is fixedly sleeved on the connecting box 20. The mounting bracket 21 is fixedly welded to the inner wall of the liquid ammonia separator 1. A vent 26 is provided on the left side of the connecting box 20, and the vent 26 is fixed to the inlet 4 by a pipe. The connecting box 20 has a separation filter cylinder 28 at the bottom. The top outer surface of the separation filter cylinder 28 is fitted with a bearing 27. The bearing 27 is installed on the inner bottom side of the connecting box 20. The inner top and bottom sides of the separation filter cylinder 28 are fixedly connected with support frames 29. A rotating rod 25 is fixedly inserted between the two sets of support frames 29. The top end of the rotating rod 25 extends out of the top side of the connecting box 20 and is connected to the bottom of the magnetic coupling 24. Several filter screens 30 are also installed on the inner wall of the separation filter cylinder 28.

[0027] When the centrifugal separation assembly is working, the drive motor 19 is fixed to the middle of the top side of the sealing cover 2. Its output shaft is connected to the top of the rotating rod 25 through the magnetic coupling 24. The bottom end of the rotating rod 25 passes through the bottom side of the connecting box 20 and is fixed to the support frame 29 inside the separation filter cylinder 28, which is rotatably installed on the bottom side of the connecting box 20 via the bearing 27. When the drive motor 19 starts, it drives the rotating rod 25 and the separation filter cylinder 28 to rotate at high speed through the magnetic coupling 24. The filter screen 30 on the inner wall of the separation filter cylinder 28 rotates synchronously with the filter cylinder. The gas containing liquid ammonia enters the connecting box 20 through the air inlet 4 and the air outlet 26, and then enters the interior of the separation filter cylinder 28. Under the action of centrifugal force, the liquid particles are intercepted by the filter screen 30 and thrown towards the inner wall of the separation filter cylinder 28. After agglomeration, they fall into the bottom of the liquid ammonia separator 1 along the inner wall of the separation filter cylinder 28.

[0028] The liquid level regulating component includes an ultrasonic level gauge 10, which is installed on the front side of the sealing cover 2. An outlet 13 is provided in the middle of the bottom side of the liquid ammonia separator 1. The output end of the outlet 13 is fixedly connected to a three-way pipe 14, and the left output end of the three-way pipe 14 is fixedly connected to an electric valve 15.

[0029] When the liquid level regulating component is working, the ultrasonic level gauge 10 is installed on the front side of the sealing cover 2, which emits ultrasonic waves in real time and receives the reflected signals from the liquid surface. The liquid level height in the liquid ammonia separator 1 is calculated by measuring the round-trip time of the signal. The liquid level data is converted into an electrical signal and transmitted to the PLC control box 3. When the liquid level is higher or lower than the set value, the PLC control box 3 sends a control signal to the electric valve 15 to adjust its opening to control the amount of liquid ammonia discharged from the outlet 13 and the three-way pipe 14. When the liquid level is too high, the opening of the electric valve 15 is increased to speed up the discharge. When the liquid level is too low, the opening is decreased to slow down the discharge, thereby realizing automatic liquid level regulation.

[0030] A PLC control box 3 is installed on the front side of the liquid ammonia separator 1. As the core of the system control, it receives the liquid level signal from the ultrasonic level gauge 10, the temperature signal from the temperature sensor 12, and the pressure signal from the pressure transmitter 11 in real time. Through the built-in control algorithm, it processes and analyzes the multi-dimensional data to generate corresponding control commands, accurately control the opening degree of the electric valve 15, realizes the closed-loop automatic adjustment of the liquid level in the liquid ammonia separator 1, and can monitor and alarm abnormal system conditions.

[0031] A temperature sensor 12 is also installed on the front side of the sealing cover 2, which directly contacts the internal area of ​​the liquid ammonia separator 1 to collect the temperature data inside the separator in real time, convert it into a standard signal and transmit it to the PLC control box 3 to compensate for the influence of temperature on liquid level measurement, and at the same time provide temperature parameters for system operation condition analysis.

[0032] A pressure transmitter 11 is also installed on the rear side of the sealing cover 2 to monitor the gas phase pressure inside the separator and feed the pressure signal back to the PLC control box 3 to determine whether the system is over-pressured.

[0033] An outlet hopper 22 is fixedly connected to the bottom input end of the outlet 5. A micro filter plate 23 is fixedly installed on the bottom side of the outlet hopper 22. When gas enters the outlet hopper 22 through the outlet 5, the micro filter plate 23 intercepts the fine droplets or solid particles remaining in the gas, allowing clean gas to enter the outlet cylinder 7 through the pores of the micro filter plate 23. After further adsorption treatment by the molecular sieve 18, the gas is discharged from the outlet pipe 9, ensuring that downstream equipment is not contaminated by impurities.

[0034] The right-side output end of the three-way pipe 14 is fixedly connected to a manual shut-off valve 16. When the electric valve 15 malfunctions or the system needs maintenance, the operator can manually open the manual shut-off valve 16. Liquid ammonia is discharged through the outlet 13, the right-side channel of the three-way pipe 14, and the manual shut-off valve 16, serving as an emergency drainage channel.

[0035] Working principle: When the automatic liquid level control system of this liquid ammonia separator is working, the gas containing liquid ammonia enters the inlet cylinder 6 through the inlet pipe 8, and forms a swirling flow under the guidance of the spiral air passage 17. It then enters the liquid ammonia separator 1 through the inlet port 4. Since the drive motor 19 is fixed to the middle of the top side of the sealing cover 2, its output shaft is connected to the top of the rotating rod 25 through the magnetic coupling 24. The bottom end of the rotating rod 25 passes through the bottom side of the connecting box 20 and is rotatably installed in the separation filter cartridge 28 on the bottom side of the connecting box 20 via the bearing 27. The support frame 29 is fixed. When the drive motor 19 starts, it drives the rotating rod 25 and the separation filter cylinder 28 to rotate at high speed through the magnetic coupling 24. The filter screen 30 on the inner wall of the separation filter cylinder 28 rotates synchronously with the filter cylinder. The liquid ammonia gas enters the connecting box 20 through the air inlet 4 and the air outlet 26, and then enters the interior of the separation filter cylinder 28. Under the action of centrifugal force, the liquid particles are intercepted by the filter screen 30 and thrown towards the inner wall of the separation filter cylinder 28. After agglomeration, they fall along the inner wall of the separation filter cylinder 28 to the bottom of the liquid ammonia separator 1.

[0036] The gas separated from the liquid enters the gas outlet 7 through the gas outlet 5, is filtered by the molecular sieve 18 inside the gas outlet 7, and is discharged from the gas outlet pipe 9. Since the ultrasonic level gauge 10 is installed on the front side of the sealing cover 2, it emits ultrasonic waves in real time and receives the reflected signals from the liquid surface. By measuring the round-trip time of the signal, the liquid level height in the liquid ammonia separator 1 is calculated, and the liquid level data is converted into an electrical signal and transmitted to the PLC control box 3. When the liquid level is higher or lower than the set value, the PLC control box 3 sends a control signal to the electric valve 15 to adjust its opening to control the amount of liquid ammonia discharged from the liquid outlet 13 and the three-way pipe 14. When the liquid level is too high, the opening of the electric valve 15 is increased to speed up the discharge. When the liquid level is too low, the opening is decreased to slow down the discharge, thereby realizing automatic liquid level adjustment. When the electric valve 15 malfunctions or the system needs maintenance, the operator can manually open the manual shut-off valve 16. The liquid ammonia is discharged through the right channel of the liquid outlet 13 and the three-way pipe 14 through the manual shut-off valve 16 as an emergency discharge channel.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic liquid level control system for a liquid ammonia separator, comprising a liquid ammonia separator (1), characterized in that: The top of the liquid ammonia separator (1) is fixedly installed with a sealing cover (2) by bolts. The top left and right sides of the sealing cover (2) are respectively provided with an air inlet (4) and an air outlet (5). The top input end of the air inlet (4) is fixedly connected to an air inlet cylinder (6). The inside of the air inlet cylinder (6) is provided with a spiral air passage (17). The top input end of the air inlet cylinder (6) is fixedly connected to an air inlet pipe (8). The top output end of the air outlet (5) is fixedly connected to an air outlet cylinder (7). The inside of the air outlet cylinder (7) is provided with a molecular sieve (18). The top output end of the air outlet cylinder (7) is fixedly connected to an air outlet pipe (9). A centrifugal separation component is installed on the top inner side of the sealing cover (2). A liquid level adjustment component is installed between the liquid ammonia separator (1) and the sealing cover (2).

2. The automatic liquid level control system of a liquid ammonia separator according to claim 1, characterized in that: The centrifugal separation assembly includes a drive motor (19), which is fixedly installed on the top center of the sealing cover (2). A magnetic coupling (24) is inserted through the center of the sealing cover (2). The output shaft of the drive motor (19) is connected to the top of the magnetic coupling (24). A connecting box (20) is provided on the bottom center of the sealing cover (2). A mounting bracket (21) is fixedly sleeved on the connecting box (20). The mounting bracket (21) is fixedly welded to the inner wall of the liquid ammonia separator (1). A vent (26) is opened on the left side of the connecting box (20). The vent (26) and the air inlet (4) are connected by a pipe. The communication box (20) is equipped with a separation filter cylinder (28) at the bottom. The top outer surface of the separation filter cylinder (28) is fitted with a bearing (27). The bearing (27) is installed on the inner bottom side of the communication box (20). The top and bottom sides of the separation filter cylinder (28) are fixedly connected with support frames (29). A rotating rod (25) is fixedly inserted between the two sets of support frames (29). The top end of the rotating rod (25) extends out of the top side of the communication box (20) and is connected to the bottom of the magnetic coupling (24). Several filter screens (30) are also installed on the inner wall of the separation filter cylinder (28).

3. The automatic liquid level control system of a liquid ammonia separator according to claim 1, characterized in that: The liquid level regulating assembly includes an ultrasonic level gauge (10), which is installed on the front side of the sealing cover (2). The liquid ammonia separator (1) has an outlet (13) in the middle of its bottom side. The output end of the outlet (13) is fixedly connected to a three-way pipe (14), and the left output end of the three-way pipe (14) is fixedly connected to an electric valve (15).

4. The automatic liquid level control system of an ammonia separator according to claim 3, characterized in that: A PLC control box (3) is installed on the front side of the liquid ammonia separator (1).

5. The automatic liquid level control system for a liquid ammonia separator according to claim 3, characterized in that: A temperature sensor (12) is also installed on the front side of the sealing cover (2).

6. The automatic liquid level control system for a liquid ammonia separator according to claim 1, characterized in that: A pressure transmitter (11) is also installed on the rear side of the sealing cover (2).

7. The automatic liquid level control system for a liquid ammonia separator according to claim 1, characterized in that: An air outlet (5) is fixedly connected to an air outlet bucket (22) at its bottom input end, and a micro filter plate (23) is fixedly installed on the bottom side inside the air outlet bucket (22).

8. The automatic liquid level control system for a liquid ammonia separator according to claim 3, characterized in that: The right output end of the three-way pipe (14) is fixedly connected to a manual shut-off valve (16).

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