Phosphonium prewash column liquid level monitoring device

Abstract

The utility model belongs to liquid level monitoring technical field especially is involved a kind of phosphorus ammonium prewash tower liquid level monitoring device, including, washing tower, the washing tower includes cylindrical barrel body and conical cylinder bottom;Communicator, communicator includes horizontal pipeline and vertical pipeline that intercommunicate, the horizontal pipeline is located in the lateral wall of the conical cylinder bottom, and is communicated with conical cylinder bottom, the upper side of vertical pipeline is communicated with cylindrical barrel body by communicating pipe;Radar liquid level meter, is located in the upper end of vertical pipeline, for measuring the liquid level height in the communicator. This liquid level monitoring device, with prewash tower welding communication, install radar liquid level meter in monitoring device top, realize the indirect measurement to the liquid level in tower by the measurement to the liquid level in communicator, realize the accurate measurement of prewash tower liquid level in tower, solve the technical problem that the liquid level of phosphorus ammonium device prewash tower cannot be accurately measured.

Description

Technical Field

[0001] This utility model belongs to the field of liquid level monitoring technology, and in particular relates to a liquid level monitoring device for an ammonium phosphate prewashing tower. Background Technology

[0002] The pre-washing tower is the main equipment for treating the tail gas of the ammonium phosphate production plant. Its structure is conical at the bottom and cylindrical at the top. The main materials entering the pre-washing tower include: phosphoric acid with a P2O5 content of approximately 42%, sulfuric acid with a concentration of 98%, gaseous ammonia, ammonium phosphate dust, and process water, among others. The media are diverse, and some materials are acidic or alkaline. This pre-washing tower primarily recycles and washes the tail gas (containing ammonia, ammonium phosphate dust, and water vapor) from the granulation process. During production, ammonia reacts chemically with phosphoric acid and sulfuric acid to form an unsaturated ammonium phosphate slurry solution with an N / P molar ratio of approximately 0.5, a slurry specific gravity of 1.4-1.6, and a temperature of 50-65℃. The pressure inside the tower is a negative pressure of approximately 1.7 kPa. There is no stirring equipment inside the tower; the slurry is circulated entirely by a pump in the conical part of the tower to prevent solid deposition and agglomeration.

[0003] like Figure 1 As shown, the pre-washing tower 1 uses a single-diaphragm differential pressure level gauge 12 for liquid level monitoring. However, based on years of actual operation, the gauge has proven problematic. It is significantly affected by variations in the medium and slurry specific gravity within the tower. The lower pressure sampling pipe is prone to blockage by phosphate slurry buildup, and the upper pressure sampling pipe, being far from the liquid surface, is susceptible to interference from acid mist, dust, and water vapor in the upper space, leading to distorted liquid levels and hindering process control. The liquid level monitoring required for production control is primarily located at the point from the horizontal section of the tower to the conical section. Low liquid levels can result in poor washing performance, blockage of washing pipes, and damage to the slurry pump. High liquid levels can cause slurry overflow, posing environmental hazards and requiring unit shutdowns for maintenance and cleaning, thus reducing production and impacting the company's economic benefits. Furthermore, it increases the workload for maintenance staff.

[0004] Therefore, finding a simple and applicable method for monitoring the liquid level of ammonium phosphate slurry has become an important issue that urgently needs to be addressed. Utility Model Content

[0005] In view of the technical problems existing in the background art, this utility model provides a liquid level monitoring device for ammonium phosphate prewashing tower.

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows: A phosphate prewashing tower liquid level monitoring device, comprising, A scrubbing tower, the scrubbing tower comprising a cylindrical body and a conical bottom; A communicating vessel includes a horizontal pipe and a vertical pipe that are interconnected. The horizontal pipe is located on the side wall of the bottom of the conical cylinder and is connected to the bottom of the conical cylinder. The upper side of the vertical pipe is connected to the cylindrical body through a connecting pipe. A radar level gauge is installed at the upper end of the vertical pipe to measure the liquid level height within the communicating vessel.

[0007] Optionally, an inlet pipe is integrally connected to one side of the horizontal pipe, and a flushing pipe is detachably connected to the inlet pipe.

[0008] Optionally, a horizontal cylinder is horizontally arranged on one side of the cylindrical body, one end of the horizontal cylinder is connected to a collection box, the upper end of the collection box is connected to a spray cylinder, the upper end of the spray cylinder is provided with an air inlet for introducing the exhaust gas to be treated, and a plurality of first spray components are arranged inside the spray cylinder; the bottom of the conical cylinder is connected to the first spray components through a circulation pipe, and a pre-washing pump is arranged on the circulation pipe.

[0009] Optionally, one end of the flushing pipe is connected to a circulation pipe.

[0010] Optionally, the horizontal cylinder is provided with a plurality of second spraying components, which are connected to the circulation pipe.

[0011] Optionally, the ammonium phosphate prewashing tower liquid level monitoring device further includes a variable diameter nozzle and a cover plate. A first flange is provided at the end of the liquid inlet pipe, the cover plate is connected to the first flange, one end of the variable diameter nozzle is connected to the cover plate, and the other end is connected to the flushing pipe.

[0012] Optionally, one end of the variable diameter nozzle is provided with a nozzle section, which is inserted into the inner hole of the cover plate; one end of the variable diameter nozzle is provided with a second flange, one side of the second flange is provided with an arc-shaped plate, and one end of the flushing pipe is provided with a third flange; the second flange and the third flange are connected.

[0013] Optionally, the first flange has a plurality of first connecting holes evenly distributed around its circumference, the cover plate has a plurality of second connecting holes evenly distributed around its circumference corresponding to the first connecting holes, and the arc plate has a plurality of third connecting holes evenly distributed around its circumference corresponding to the second connecting holes; the first connecting holes, the second connecting holes, and the third connecting holes are aligned and a first bolt assembly is inserted to connect the first flange, the cover plate, and the arc plate; the remaining first connecting holes and second connecting holes are used to insert a second bolt assembly to connect the first flange and the cover plate.

[0014] Optionally, the third flange has several fourth connecting holes evenly distributed around its circumference, and a third bolt assembly is inserted into the fourth connecting holes to connect the second flange and the third flange.

[0015] Optionally, a sealing ring is provided in the inner hole of the cover plate, the sealing ring is in close contact with the outer wall of the nozzle section, and a pressure ring is provided on the nozzle section, the pressure ring pressing the sealing ring.

[0016] This utility model has the following advantages and beneficial effects: 1. The liquid level monitoring device of this application uses a communicating vessel, which includes a horizontal pipe, a vertical pipe and a connecting pipe, and the overall structure is designed as an "inverted F type".

[0017] 2. The liquid level monitoring device of this application has a vertical pipe with a certain height, and based on the radar wave emission angle of 3° of the radar liquid level gauge, it can monitor the effective liquid level.

[0018] 3. The bottom of the liquid level monitoring device of this application is designed with a flushing pipe, which continuously flushes the device with ammonium phosphate slurry delivered by a pre-washing pump to ensure unobstructed flow of the communication device and solve the problem of material clogging in the liquid level monitoring device.

[0019] 4. The upper part of the liquid level monitoring device of this application is designed with a connecting pipe that is connected to the pre-washing tower. Due to the physicochemical properties of ammonium phosphate slurry, it will release ammonia gas, water vapor, etc. This connecting pipe mainly facilitates the escape of these gases into the pre-washing tower, and removes them under the negative pressure control of the pre-washing tower, avoiding the formation of gas blockage in the monitoring device, so that the liquid level will not fluctuate with the production process control, resulting in liquid level monitoring distortion.

[0020] In summary, this liquid level monitoring device is welded and connected to the pre-washing tower. A radar level gauge is installed on the top of the monitoring device, which enables indirect measurement of the liquid level in the tower by measuring the liquid level in the communicating vessel. This achieves accurate measurement of the liquid level in the pre-washing tower and solves the technical problem of inaccurate measurement of the liquid level in the pre-washing tower of existing phosphate fertilizer plants. Attached Figure Description

[0021] Figure 1 This is a structural diagram of a liquid level monitoring device in the prior art; Figure 2 This is a structural diagram of the liquid level monitoring device in this utility model; Figure 3 for Figure 2 Enlarged view of a portion of the central structure; Figure 4 This is one of the structural diagrams of the liquid inlet pipe, the reducing pipe, and the flushing pipe in this utility model; Figure 5 This is the second structural diagram of the liquid inlet pipe, the reducing pipe, and the flushing pipe in this utility model; Figure 6 This is a front view of the liquid inlet pipe, the reducing pipe, and the flushing pipe in this utility model; Figure 7 This is a cross-sectional view of the liquid inlet pipe, the reducing pipe, and the flushing pipe in this utility model; Figure 8 This is one of the structural diagrams of the variable diameter pipe in this utility model; Figure 9 This is the second structural diagram of the variable diameter pipe in this utility model; Figure 10 This is a front view of the variable diameter pipe in this utility model; Figure 11 for Figure 10 The right view.

[0022] Reference numerals: 1-Cylindrical body, 11-Horizontal cylinder, 12-Single diaphragm differential pressure level gauge, 13-Collection tank, 2-Conical bottom, 21-Grate, 22-Bearing beam, 3-Communicating device, 31-Horizontal pipe, 32-Vertical pipe, 33-Connecting pipe, 34-Inlet pipe, 35-First flange, 36-First connection hole, 4-Radar level gauge, 41-Radar wave, 5-Flushing pipe, 51-Third flange, 52-Third... 6- Bolt assembly, 7- Spray cylinder, 8- Pre-wash pump, 9- Circulation pipe, 10- Branch pipe, 11- First spray assembly, 12- Second spray assembly, 13- Variable diameter nozzle, 14- Nozzle section, 15- Pressure ring, 16- Second flange, 17- Fourth connection hole, 18- Arc plate, 19- Third connection hole, 10- Cover plate, 10- Second connection hole, 11- Second bolt assembly, 12- Second bolt assembly, 13- First bolt assembly, 14- Sealing ring. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] Example like Figure 2 and Figure 3 As shown, a phosphate prewashing tower liquid level monitoring device includes components such as a washing tower, a communicating vessel 3, and a radar level gauge 4.

[0026] in: The scrubbing tower includes a cylindrical body 1 and a conical bottom 2. The bottom side of the conical bottom 2 is mounted on a load-bearing beam 22.

[0027] The communicating vessel 3 includes a horizontal pipe 31 and a vertical pipe 32 that are interconnected. The horizontal pipe 31 is located on the side wall of the conical bottom 2 and is connected to the conical bottom 2. A grid 21 is installed inside the conical bottom 2, and the horizontal pipe 31 is located on the bottom side of the grid 21 to prevent clumps from falling off the inner wall of the tower and clogging the circulation pipe 71 on the bottom side. The upper side of the vertical pipe 32 is connected to the cylindrical body 1 through a connecting pipe 33. The overall communicating vessel 3 is designed as an "inverted F-shaped" structure.

[0028] A radar level gauge 4 is installed at the upper end of the vertical pipe 32. The radar level gauge 4 emits radar waves 41 to measure the liquid level height within the communicating vessel 3. The radar wave 41 emitted by the radar level gauge 4 has an angle of 3°. To monitor the effective liquid level, the diameter of the vertical pipe 32 is selected as DN350 and the height as 4m based on theoretical calculations.

[0029] This liquid level monitoring device is welded and connected to the pre-washing tower. A radar level gauge 4 is installed on the top of the monitoring device, which realizes the indirect measurement of the liquid level in the tower by measuring the liquid level in the communicating vessel 3. This achieves accurate measurement of the liquid level in the pre-washing tower and solves the technical problem that the liquid level in the pre-washing tower of the existing phosphate ammonium plant cannot be accurately measured.

[0030] Furthermore, a liquid inlet pipe 34 is integrally connected to one side of the horizontal pipe 31, and a flushing pipe 5 is detachably connected to the liquid inlet pipe 34. A flushing pipe 5 is designed at the bottom of the liquid level monitoring device, that is, on one side of the horizontal pipe 31, and the ammonium phosphate slurry is continuously flushed by the pre-washing pump 7 to ensure that the communicating vessel 3 is unobstructed and to solve the problem of material clogging in the liquid level monitoring device.

[0031] In this utility model, a horizontal cylinder 11 is horizontally arranged on one side of the cylindrical body 1. One end of the horizontal cylinder 11 is connected to the collection box 13. The upper end of the collection box 13 is connected to the spray cylinder 6. The upper end of the spray cylinder 6 is provided with an air inlet for introducing the exhaust gas to be treated. Several first spray components 73 are arranged inside the spray cylinder 6 to realize the first spray. The conical bottom 2 is connected to the first spray components 73 through a circulation pipe 71 and a branch pipe 72. A pre-washing pump 7 is arranged on the circulation pipe 71. The pre-washing pump 7 is used to circulate the ammonium phosphate slurry in the washing tower to the first spray components 73 to spray the exhaust gas.

[0032] Furthermore, one end of the flushing pipe 5 is connected to the circulation pipe 71. The pre-washing pump 7 continuously flushes the ammonium phosphate slurry to ensure the unobstructed flow of the communicating vessel 3 and to solve the problem of material clogging in the liquid level monitoring device.

[0033] Furthermore, several second spraying components 74 are installed inside the horizontal cylinder 11. The second spraying components 74 are connected to the circulation pipe 71 through the branch pipe 72. The pre-washing pump 7 is used to circulate the ammonium phosphate slurry in the washing tower to the second spraying components 74 to spray the exhaust gas.

[0034] like Figures 4-11 As shown in the figure, the ammonium phosphate pre-washing tower liquid level monitoring device of this utility model also includes a variable diameter nozzle 8 and a cover plate 9. A first flange 35 is provided at the end of the inlet pipe 34, and the cover plate 9 is connected to the first flange 35. One end of the variable diameter nozzle 8 is connected to the cover plate 9, and the other end is connected to the flushing pipe 5. By using the variable diameter nozzle 8 to connect the flushing pipe 5 to the inlet pipe 34, the inner diameter of the pipe is changed, thereby achieving pressurized flushing and increasing the cleaning effect.

[0035] Furthermore, one end of the variable diameter nozzle 8 is provided with a nozzle section 81, which is inserted into the inner hole of the cover plate 9. The nozzle section 81 is located on the bottom side inside the liquid inlet pipe 34, because the bottom inner wall of the liquid inlet pipe 34 is most prone to scale buildup. Therefore, the nozzle section 81 is located at this position to achieve efficient flushing. One end of the variable diameter nozzle 8 is provided with a second flange 83, and one side of the second flange 83 is provided with an arc-shaped plate 85. One end of the flushing pipe 5 is provided with a third flange 51; the second flange 83 is connected to the third flange 51. This method enables a detachable connection between the variable diameter nozzle 8 and the flushing pipe 5, as well as an insertion connection between the variable diameter nozzle 8 and the cover plate 9, facilitating disassembly and assembly. In particular, the disassembly and assembly of the variable diameter nozzle 8 facilitates subsequent replacement and maintenance, preventing internal scale buildup.

[0036] Furthermore, the first flange 35 has several first connecting holes 36 evenly distributed around its circumference, the cover plate 9 has several second connecting holes 91 evenly distributed around its circumference corresponding to the first connecting holes 36, and the arc plate 85 has several third connecting holes 86 evenly distributed around its circumference corresponding to the second connecting holes 91. The first connecting holes 36, the second connecting holes 91, and the third connecting holes 86 are aligned and the first bolt assembly 93 is inserted to connect the first flange 35, the cover plate 9, and the arc plate 85. In this way, the liquid inlet pipe 34, the cover plate 9, and the variable diameter nozzle 8 can be connected through the first bolt assembly 93. The overall structure is ingenious and easy to operate. The remaining first connecting holes 36 and second connecting holes 91 are used to insert the second bolt assembly 92 to connect the first flange 35 and the cover plate 9.

[0037] Furthermore, the third flange 51 has several fourth connection holes 84 evenly distributed around its circumference. The third bolt assembly 52 is inserted into the fourth connection holes 84 to connect the second flange 83 to the third flange 51, thereby realizing the connection between the variable diameter nozzle 8 and the flushing pipe 5.

[0038] In this utility model, the first bolt assembly 93 and the second bolt assembly 92 are located on both sides to achieve corresponding connections. The third bolt assembly 52 is installed separately from the first bolt assembly 93. The overall structure is compact and can achieve a fast and reliable connection with fewer bolts.

[0039] Furthermore, a sealing ring 10 is provided in the inner hole of the cover plate 9. The sealing ring 10 is in close contact with the outer wall of the nozzle section 81. A pressure ring 82 is provided on the nozzle section 81. The pressure ring 82 presses the sealing ring 10 to achieve an effective sealing connection.

[0040] In this invention, since the washing tower itself is equipped with a phosphoric acid inlet pipe (DN80), the inlet of the phosphoric acid inlet pipe can also be changed from the tower wall to the port of the communicating vessel 3, that is, to the position of the liquid inlet pipe 34, so that the bottom of the monitoring device can be continuously flushed with phosphoric acid to ensure that the communicating vessel 3 is unobstructed.

[0041] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A liquid level monitoring device for an ammonium phosphate prewashing tower, characterized in that: include, A scrubbing tower, the scrubbing tower comprising a cylindrical body and a conical bottom; A communicating vessel includes a horizontal pipe and a vertical pipe that are interconnected. The horizontal pipe is located on the side wall of the bottom of the conical cylinder and is connected to the bottom of the conical cylinder. The upper side of the vertical pipe is connected to the cylindrical body through a connecting pipe. A radar level gauge is installed at the upper end of the vertical pipe to measure the liquid level height within the communicating vessel.

2. The ammonium phosphate prewashing tower liquid level monitoring device according to claim 1, characterized in that: One side of the horizontal pipe is integrally connected to an inlet pipe, and a flushing pipe is detachably connected to the inlet pipe.

3. The ammonium phosphate prewashing tower liquid level monitoring device according to claim 2, characterized in that: A horizontal cylinder is horizontally arranged on one side of the cylindrical body. One end of the horizontal cylinder is connected to a collection box. The upper end of the collection box is connected to a spray cylinder. An air inlet for introducing the exhaust gas to be treated is opened at the upper end of the spray cylinder. Several first spray components are arranged inside the spray cylinder. The bottom of the conical cylinder is connected to the first spray components through a circulation pipe. A pre-washing pump is arranged on the circulation pipe.

4. The ammonium phosphate prewashing tower liquid level monitoring device according to claim 3, characterized in that: One end of the flushing pipe is connected to the circulation pipe.

5. The ammonium phosphate prewashing tower liquid level monitoring device according to claim 3, characterized in that: The horizontal cylinder is equipped with several second spraying components, which are connected to the circulation pipe.

6. The ammonium phosphate prewashing tower liquid level monitoring device according to claim 2, characterized in that: It also includes a variable diameter nozzle and a cover plate. The end of the liquid inlet pipe is provided with a first flange, the cover plate is connected to the first flange, one end of the variable diameter nozzle is connected to the cover plate, and the other end is connected to the flushing pipe.

7. The ammonium phosphate prewashing tower liquid level monitoring device according to claim 6, characterized in that: One end of the variable diameter nozzle is provided with a nozzle section, which is inserted into the inner hole of the cover plate; one end of the variable diameter nozzle is provided with a second flange, and one side of the second flange is provided with an arc-shaped plate; one end of the flushing pipe is provided with a third flange; the second flange and the third flange are connected.

8. The ammonium phosphate prewashing tower liquid level monitoring device according to claim 7, characterized in that: The first flange has a plurality of first connecting holes evenly distributed around its circumference, the cover plate has a plurality of second connecting holes evenly distributed around its circumference corresponding to the first connecting holes, and the arc plate has a plurality of third connecting holes evenly distributed around its circumference corresponding to the second connecting holes; the first connecting holes, the second connecting holes, and the third connecting holes are aligned and a first bolt assembly is inserted to connect the first flange, the cover plate, and the arc plate; the remaining first connecting holes and second connecting holes are used to insert a second bolt assembly to connect the first flange and the cover plate.

9. The ammonium phosphate prewashing tower liquid level monitoring device according to claim 8, characterized in that: The third flange has several fourth connection holes evenly distributed around its circumference. A third bolt assembly is inserted into the fourth connection holes to connect the second flange and the third flange.

10. The ammonium phosphate prewashing tower liquid level monitoring device according to claim 8, characterized in that: A sealing ring is provided in the inner hole of the cover plate, and the sealing ring is in close contact with the outer wall of the nozzle section. A pressure ring is provided on the nozzle section, and the pressure ring presses the sealing ring tightly.

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