Liquid level monitoring device for wet-process phosphoric acid concentration flash chamber

Abstract

The utility model relates to the technical field of phosphoric acid processing equipment, in particular to a liquid level monitoring device for a wet-process phosphoric acid concentration flash chamber, which is characterized in that the bottom of the flash chamber is connected with a downcomer, one side of the downcomer is provided with a liquid level sensing component, one side of the bottom of the flash chamber is connected with a graphite heat exchanger, one side of the flash chamber is connected with a demister, and the other side of the flash chamber is connected with a liquid level sensor. A protective cover is installed at the position, close to the outer side of the liquid level sensing assembly, in the downcomer, and the liquid level sensing assembly comprises a sensor connector and a differential pressure type liquid level sensor. According to the liquid level monitoring device for the wet-process phosphoric acid concentration flash chamber, through unique structural design and functional configuration, the technical problem of phosphoric acid liquid level monitoring under the vacuum condition in phosphate fertilizer industrial production is effectively solved. The pressure difference type liquid level sensor in the device can stably and accurately monitor the liquid level of phosphoric acid and transmit data to an external console in real time, so that a reliable monitoring means is provided for operators.

Description

Technical Field

[0001] The utility model relates to the technical field of phosphoric acid processing equipment, in particular to a liquid level monitoring device for a wet-process phosphoric acid concentration flash chamber. Background Art

[0002] In the production process of phosphate fertilizer industry, the concentration of phosphoric acid is a key link. At present, the forced circulation shell and tube heat exchanger phosphoric acid concentration device is widely used. Its working principle is to heat the phosphoric acid in the shell and tube heat exchanger by low-pressure steam, and then introduce it into the flash chamber. In the flash chamber, by maintaining a certain vacuum degree, the hot phosphoric acid will evaporate rapidly, thereby achieving the purpose of concentration. When the phosphoric acid is concentrated to a certain concentration, it can be taken out for the production of fertilizers and other products.

[0003] However, it has always been a technical challenge to accurately monitor the level of phosphoric acid under vacuum conditions. Although ultrasonic, radar and other level gauges perform well under normal conditions, they cannot work properly under vacuum conditions. Therefore, the industry often uses nuclear radiation level gauges and differential pressure level gauges to meet this challenge. However, the application of nuclear radiation level gauges is limited due to high risks and difficult maintenance. In view of this, single flange differential pressure level gauges are widely used due to their stability and reliability.

[0004] On the other hand, with the rapid development of the phosphate fertilizer industry, the consumption of phosphate resources has increased dramatically, resulting in a general decline in the quality of phosphate rock and a continuous increase in impurity content. These impurities will form salt crystals during the phosphoric acid concentration process, adhere to the heat exchange surface, the inner wall of the pipeline or deposit at the bottom of the storage tank, which not only reduces the heat transfer efficiency, but also blocks the instruments and meters, making it impossible for operators to accurately understand the actual production situation of the device. This situation poses a serious threat to the stable operation and long-term use of the device, and also affects the production efficiency and quality of phosphate fertilizers. Utility Model Content

[0005] The purpose of the utility model is to provide a liquid level monitoring device for a flash chamber of wet-process phosphoric acid concentration, so as to solve the problem mentioned in the above background technology that with the rapid development of the phosphate fertilizer industry, the consumption of phosphate resources has increased dramatically, resulting in a general decline in the quality of phosphate ore and a continuous increase in impurity content. These impurities will form salt crystals during the phosphoric acid concentration process, adhere to the heat exchange surface, the inner wall of the pipeline or deposit at the bottom of the storage tank, which not only reduces the heat transfer efficiency, but also blocks the instruments and meters, making it impossible for operators to accurately understand the actual production situation of the device.

[0006] To achieve the above-mentioned purpose, the utility model provides a liquid level monitoring device for a wet-process phosphoric acid concentration flash chamber, wherein a downcomer is connected to the bottom of the flash chamber, a liquid level sensor assembly is installed on one side of the downcomer, a graphite heat exchanger is connected to one side of the bottom of the flash chamber, a demister is connected to one side of the flash chamber, a protective cover is installed inside the downcomer near the outer side of the liquid level sensor assembly, the liquid level sensor assembly comprises a sensor connector and a differential pressure liquid level sensor, one end of the sensor connector is connected to an external console via a wire, and the other end of the sensor connector is electrically connected to the differential pressure liquid level sensor.

[0007] Preferably, a filter is installed at the bottom end of the downcomer.

[0008] Preferably, a sedimentation tank is provided at the bottom end of the protective cover, a sedimentation port is provided on the top side of the sedimentation tank, an opening is installed on one side of the sedimentation tank, a sealing plug is installed on the inner side of the opening, and a blocking filter is installed on the inner side of the sealing plug.

[0009] Preferably, a cross bracket is provided at the bottom of the blocking filter, and one end of the cross bracket is fixed to the inner side of the protective cover.

[0010] Preferably, an internal thread is provided on the inner side of the opening, an external thread is installed on the outer wall of the sealing plug, the opening is threadedly connected to the sealing plug, and the sealing plug is rotatably connected to one end of the blocking filter via a bearing.

[0011] Preferably, the outer wall of the sealing plug is provided with a groove, and the inner wall of the groove is provided with a handle.

[0012] Preferably, the top of the protective cover is provided with an inclined surface.

[0013] Preferably, a slag discharge port is provided on one side of the sedimentation tank, and a plug is installed at the slag discharge port.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The liquid level monitoring device used in the flash chamber of wet-process phosphoric acid concentration has effectively solved the technical problem of phosphoric acid liquid level monitoring under vacuum conditions in the production of phosphate fertilizers through its unique structural design and functional configuration. The differential pressure liquid level sensor in the device can stably and accurately monitor the phosphoric acid liquid level and transmit the data to the external control console in real time, providing operators with a reliable monitoring method. At the same time, the design of the protective cover and the sedimentation tank effectively prevents impurities and crystals in the phosphoric acid from clogging and damaging the sensor, ensuring the continuity and accuracy of liquid level monitoring. The application of this device not only improves the automation level of phosphate fertilizer production, but also provides a strong guarantee for the stable operation and long-term use of the device, thereby improving the production efficiency and product quality of phosphate fertilizers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a partial structural schematic diagram of the utility model;

[0018] Figure 3 It is a schematic diagram of the structure of the protective cover in the utility model.

[0019] The meaning of each number in the figure is:

[0020] 1. Liquid level sensor assembly; 11. Sensor connector; 12. Pressure differential liquid level sensor; 2. Defoamer; 3. Flash chamber; 31. Downcomer; 4. Graphite heat exchanger; 5. Filter; 6. Protective cover; 61. Sedimentation tank; 611. Sedimentation port; 62. Blocking filter; 63. Opening; 64. Sealing plug; 65. Cross bracket; 66. Plug. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] The utility model provides a liquid level monitoring device for a wet-process phosphoric acid concentration flash chamber, such as Figure 1-Figure 3 As shown, a downcomer 31 is connected to the bottom of the flash chamber 3, a liquid level sensing assembly 1 is installed on one side of the downcomer 31, a graphite heat exchanger 4 is connected to one side of the bottom of the flash chamber 3, a demister 2 is connected to one side of the flash chamber 3, a protective cover 6 is installed inside the downcomer 31 near the outside of the liquid level sensing assembly 1, the liquid level sensing assembly 1 includes a sensor connector 11 and a differential pressure liquid level sensor 12, one end of the sensor connector 11 is connected to an external control console through a wire, and the other end of the sensor connector 11 is electrically connected to the differential pressure liquid level sensor 12, so as to measure the pressure difference of the liquid inside the downcomer 31 and measure the liquid level through the pressure difference.

[0023] In this embodiment, a filter 5 is installed at the bottom end of the downcomer 31 to facilitate filtering of the descending water.

[0024] Specifically, a sedimentation tank 61 is provided at the bottom end of the protective cover 6, a sedimentation port 611 is provided on the top side of the sedimentation tank 61, an opening 63 is installed on one side of the sedimentation tank 61, a sealing plug 64 is installed on the inner side of the opening 63, and a blocking filter 62 is installed on the inner side of the sealing plug 64 to block impurities.

[0025] Furthermore, a cross bracket 65 is provided at the bottom of the blocking filter 62 , and one end of the cross bracket 65 is fixed to the inner side of the protective cover 6 , so as to support the blocking filter 62 .

[0026] Furthermore, an internal thread is provided on the inner side of the opening 63, and an external thread is installed on the outer wall of the sealing plug 64. The opening 63 is threadedly connected to the sealing plug 64, and the sealing plug 64 is rotatably connected to one end of the blocking filter 62 through a bearing to facilitate the opening and closing of the sealing plug 64.

[0027] Furthermore, the outer wall of the sealing plug 64 is provided with a groove, and the inner wall of the groove is provided with a handle to facilitate the opening and sealing of the sealing plug 64 .

[0028] Furthermore, the top of the protective cover 6 is provided with an inclined surface, and impurities attached thereto will flow along with the water flow to avoid the impurities adhering to the outer wall of the protective cover 6.

[0029] Furthermore, a slag discharge port is provided on one side of the sedimentation tank 61 , and a plug 66 is installed at the slag discharge port.

[0030] When the liquid level monitoring device for wet-process phosphoric acid concentration flash chamber of the utility model is used, first, the device monitors the liquid level inside the downcomer 31 in real time through the liquid level sensor assembly 1. The liquid level sensor assembly 1 includes a sensor connector 11 and a differential pressure liquid level sensor 12. The sensor connector 11 is connected to an external console through a wire and is electrically connected to the differential pressure liquid level sensor 12. When the liquid level inside the downcomer 31 changes, the differential pressure liquid level sensor 12 can sense the change and transmit the signal to the external console through the sensor connector 11, thereby realizing real-time monitoring of the liquid level.

[0031] While monitoring the liquid level, the protective cover 6 plays a key role. It is installed inside the downcomer 31, close to the outside of the liquid level sensing assembly 1. The design of the protective cover 6 is to protect the liquid level sensor from interference from impurities and particulate matter, thereby ensuring the accuracy of the liquid level measurement.

[0032] When the liquid flows through the protective cover 6, the impurities and particles therein are intercepted by the blocking filter 62. As time goes by, these impurities and particles will gradually accumulate on the blocking filter 62. In order to regularly clean these impurities, the opening 63 can be opened by rotating the sealing plug 64, and then the impurities on the blocking filter 62 can be removed. After the cleaning is completed, the sealing plug 64 is tightened to close the opening 63.

[0033] In addition, a sedimentation tank 61 is provided at the bottom of the protective cover 6 to collect fine impurities passing through the blocking filter 62. These impurities will settle in the sedimentation tank 61 over time. When the impurities in the sedimentation tank 61 accumulate to a certain extent, they can be cleaned by opening the slag discharge port.

[0034] Finally, it should be noted that the electronic components of the graphite heat exchanger 4, demister 2, etc. in this embodiment are all universal standard parts or parts known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or through conventional experimental methods. In the idle part of this device, all the above-mentioned electrical components are connected by wires respectively, and the specific connection means should refer to the working sequence between the electrical components in the above-mentioned working principle to complete the electrical connection, which are all well-known technologies in the art.

[0035] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A liquid level monitoring device for a wet-process phosphoric acid concentration flash chamber, characterized in that: A downcomer (31) is connected to the bottom of the flash chamber (3), a liquid level sensor assembly (1) is installed on one side of the downcomer (31), a graphite heat exchanger (4) is connected to one side of the bottom of the flash chamber (3), a demister (2) is connected to one side of the flash chamber (3), a protective cover (6) is installed inside the downcomer (31) near the outer side of the liquid level sensor assembly (1), the liquid level sensor assembly (1) comprises a sensor connector (11) and a differential pressure liquid level sensor (12), one end of the sensor connector (11) is connected to an external control console via a wire, and the other end of the sensor connector (11) is electrically connected to the differential pressure liquid level sensor (12).

2. The liquid level monitoring device for a wet-process phosphoric acid concentration flash chamber according to claim 1, characterized in that: A filter (5) is installed at the bottom end of the downcomer (31).

3. The liquid level monitoring device for a wet-process phosphoric acid concentration flash chamber according to claim 1, characterized in that: A sedimentation tank (61) is provided at the bottom end of the protective cover (6), a sedimentation port (611) is provided on one side of the top of the sedimentation tank (61), an opening (63) is installed on one side of the sedimentation tank (61), a sealing plug (64) is installed on the inner side of the opening (63), and a blocking filter (62) is installed on the inner side of the sealing plug (64).

4. The liquid level monitoring device for a wet-process phosphoric acid concentration flash chamber according to claim 3, characterized in that: A cross bracket (65) is provided at the bottom of the blocking filter (62), and one end of the cross bracket (65) is fixed to the inner side of the protective cover (6).

5. The liquid level monitoring device for a wet-process phosphoric acid concentration flash chamber according to claim 3, characterized in that: The inner side of the opening (63) is provided with an internal thread, the outer wall of the sealing plug (64) is provided with an external thread, the opening (63) and the sealing plug (64) are threadedly connected, and the sealing plug (64) is rotatably connected to one end of the blocking filter (62) via a bearing.

6. The liquid level monitoring device for a wet-process phosphoric acid concentration flash chamber according to claim 5, characterized in that: The outer wall of the sealing plug (64) is provided with a groove, and the inner wall of the groove is provided with a handle.

7. The liquid level monitoring device for a wet-process phosphoric acid concentration flash chamber according to claim 1, characterized in that: The top of the protective cover (6) is provided with an inclined surface.

8. The liquid level monitoring device for a wet-process phosphoric acid concentration flash chamber according to claim 3, characterized in that: A slag discharge port is provided on one side of the sedimentation tank (61), and a plug (66) is installed at the slag discharge port.

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