Urea desorption tower

Abstract

The utility model discloses a urea desorption tower which comprises a desorption tower main body and a sieve tray arranged in the desorption tower main body, an anti-scaling structure is arranged in the desorption tower main body, and the anti-scaling structure comprises a bottom frame which is arranged on the inner side wall of the desorption tower main body and is positioned below the sieve tray; a rotating shaft is rotatably mounted between the bottom frame and the tower top of the desorption tower main body, the top end of the rotating shaft penetrates through the tower top and is provided with a first bevel gear, a motor is mounted at the position, close to the first bevel gear, of the top of the desorption tower main body, and a second bevel gear meshed with the first bevel gear is mounted on an output shaft of the motor; a dredging structure is arranged between the sieve tray and the underframe; according to the urea desorption tower, through the arrangement of the anti-scaling structure, the through holes of the sieve plate tray can be prevented from being scaled and blocked, and through the cooperation of the motor, the rotating shaft, the bevel gear, the threaded cylinder, the mounting plate and the limiting groove, the dredging rods on the annular frame can be controlled to move up and down to dredge the through holes in the sieve plate tray.

Description

Technical Field

[0001] The utility model relates to the technical field of desorption towers, in particular to a urea desorption tower. Background Art

[0002] A desorption tower is a device that uses gas or steam to partially separate solutes from a solvent. In a gas-liquid two-phase system, when the vapor phase partial pressure of a solute component is lower than the gas-liquid equilibrium partial pressure of that component in its solution, mass transfer of the solute component from the liquid phase to the vapor phase occurs. This process is called desorption or distillation. In the ammonia synthesis process, a desorption tower is typically used to desorb urea. When using a desorption tower to desorb urea, scaling of the trays often occurs, leading to clogging of the tray pores and liquid retention, which reduces heat exchange efficiency. To this end, we have designed a urea desorption tower that can prevent scaling from clogging the tray pores. Utility Model Content

[0003] The purpose of the utility model is to provide a urea desorption tower to address the deficiencies of the prior art and to solve the problems raised in the background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a urea desorption tower, comprising a desorption tower body and a sieve plate tray installed inside the desorption tower body, the interior of the desorption tower body being provided with an anti-scaling structure, the anti-scaling structure comprising a base frame installed on the inner side wall of the desorption tower body and located below the sieve plate tray, a rotating shaft being rotatably installed between the base frame and the top of the desorption tower body, the top of the rotating shaft passing through the top of the tower and being provided with a first bevel gear, a motor being installed at a position near the first bevel gear on the top of the desorption tower body, a second bevel gear meshing with the first bevel gear being installed on the output shaft of the motor, and a dredging structure being provided between the sieve plate tray and the base frame.

[0005] Preferably, the dredging structure includes a limiting groove, a threaded barrel, a mounting plate, an annular frame and a dredging rod. A thread is provided on the rotating shaft and located between the sieve plate tower and the base frame. A threaded barrel that can cooperate with the thread is sleeved on the thread. Four mounting plates are evenly installed on the outside of the threaded barrel. Four limiting grooves are installed on the inner side wall of the desorption tower body. One end of the four mounting plates is respectively arranged in the four limiting grooves. An annular frame is installed on the mounting plate, and multiple dredging rods are installed on the annular frame.

[0006] Preferably, the interior of the desorption tower body is equipped with a first packing layer bottom plate, a second packing layer bottom plate and a filter, the first packing layer bottom plate and the second packing layer bottom plate are both located above the sieve plate tower plate, and a first spray pipe and a second spray pipe are respectively provided above the first packing layer bottom plate and above the second packing layer bottom plate, and the filter is located below the base frame.

[0007] Preferably, the side wall of the desorption tower body is provided with two through holes and respectively provided with a steam inlet and a liquid drain port, the steam inlet and the liquid drain port are both located below the filter, and the liquid drain port is located near the bottom of the tower.

[0008] Preferably, a through hole is opened on the top of the desorption tower body and an exhaust port is provided.

[0009] Preferably, the side wall of the desorption tower body is provided with two through holes and two filling ports, and the two filling ports are respectively located slightly higher than the bottom plate of the first packing layer and the bottom plate of the second packing layer.

[0010] Preferably, the diameter of the dredging rod is slightly smaller than the diameter of the through hole on the sieve plate tray, the number of dredging rods on the annular frame is equal to the number of through holes on the sieve plate tray, and each dredging rod on the annular frame faces each through hole on the sieve plate tray.

[0011] Compared with the prior art, the present invention provides a urea desorption tower with the following beneficial effects:

[0012] The urea desorption tower can prevent the through holes of the sieve plate tray from being blocked by scaling by providing an anti-scaling structure. The motor, rotating shaft, bevel gear, threaded barrel, mounting plate and limiting groove cooperate to control the dredging rod on the annular frame to move up and down to dredge the through holes on the sieve plate tray, thereby preventing the through holes from being blocked by scaling and causing liquid support, which would lead to a decrease in heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of the desorption tower body of the utility model;

[0015] Figure 3 This is a schematic diagram of the linkage structure of the anti-scaling structure of the utility model;

[0016] Figure 4 It is a schematic diagram of the dredging structure of the utility model.

[0017] Figure numerals: 1. desorption tower body; 11. steam inlet; 12. drain port; 13. exhaust port; 14. packing port; 2. bottom plate of the first packing layer; 3. bottom plate of the second packing layer; 4. sieve plate tray; 5. filter; 6. anti-scaling structure; 61. base frame; 62. rotating shaft; 621. first bevel gear; 622. thread; 63. motor; 631. second bevel gear; 64. limiting groove; 65. threaded barrel; 66. mounting plate; 67. annular frame; 68. dredging rod; 7. first spray pipe; 8. second spray pipe. DETAILED DESCRIPTION

[0018] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 4 In this embodiment: a urea desorption tower comprises a desorption tower body 1 and a sieve plate tray 4 installed inside the desorption tower body 1, an anti-scaling structure 6 is provided inside the desorption tower body 1, and the anti-scaling structure 6 comprises a base frame 61 installed on the inner side wall of the desorption tower body 1 and located below the sieve plate tray 4, a rotating shaft 62 is rotatably installed between the base frame 61 and the top of the desorption tower body 1, the top of the rotating shaft 62 passes through the top of the tower and is installed with a first bevel gear 621, the top of the desorption tower body 1 is close to the first A motor 63 is installed at the position of the bevel gear 621, and a second bevel gear 631 meshing with the first bevel gear 621 is installed on the output shaft of the motor 63. A dredging structure is provided between the sieve plate tray 4 and the base frame 61; the dredging structure includes a limiting groove 64, a threaded barrel 65, a mounting plate 66, an annular frame 67 and a dredging rod 68. A thread 622 is provided on the rotating shaft 62 and located between the sieve plate tray 4 and the base frame 61. A threaded barrel 65 that can cooperate with the thread 622 is sleeved on the thread 622. Four mounting plates 66 are evenly installed on the outside of 65, and four limiting grooves 64 are installed on the inner wall of the desorption tower body 1. One end of the four mounting plates 66 is respectively set in the four limiting grooves 64, and an annular frame 67 is installed on the mounting plate 66. A plurality of dredging rods 68 are installed on the annular frame 67. The diameter of the dredging rod 68 is slightly smaller than the diameter of the through hole on the sieve plate tray 4. The number of dredging rods 68 on the annular frame 67 is equal to the number of through holes on the sieve plate tray 4, and each dredging rod 68 on the annular frame 67 is facing the sieve plate. Each through hole on the tower plate 4, wherein the function of the sieve plate tower plate 4 is to complete the mass transfer and heat transfer process between gas and liquid, the function of the motor 63 is to control the rotation of the rotating shaft 62 through the engagement of the bevel gear, the limiting groove 64 cooperates with the mounting plate 66 to limit the rotation of the threaded barrel 65, and the threaded barrel 65 can be controlled to move up and down by rotating the rotating shaft 62 through the cooperation of the thread 622 and the threaded barrel 65, and the dredging rod 68 can be controlled to move up and down to dredge the through hole of the sieve plate tower plate 4 through the cooperation of the threaded barrel 65, the mounting plate 66 and the annular frame 67.

[0020] See also Figure 1 and Figure 2The desorption tower body 1 is internally installed with a first packing layer bottom plate 2, a second packing layer bottom plate 3 and a filter 5. The first packing layer bottom plate 2 and the second packing layer bottom plate 3 are both located above the sieve plate tray 4. A first spray pipe 7 and a second spray pipe 8 are respectively provided above the first packing layer bottom plate 2 and above the second packing layer bottom plate 3. The filter 5 is located below the base frame 61. The side wall of the desorption tower body 1 is provided with two through holes and is respectively provided with a steam inlet 11 and a drain port 12. The steam inlet 11 and the drain port 12 are both located below the filter 5. The drain port 12 is located near the bottom of the tower. The top of the desorption tower body 1 is provided with a through hole and is provided with a An exhaust port 13 is provided, and two through holes are opened on the side wall of the desorption tower body 1 and two filling ports 14 are provided. The two filling ports 14 are respectively located slightly higher than the first packing layer bottom plate 2 and the second packing layer bottom plate 3, wherein the first packing layer bottom plate 2 and the second packing layer bottom plate 3 are used to stack fillers, the function of the filter 5 is to filter particulate impurities, the first spray pipe 7 is used to spray reflux liquid, the second spray pipe 8 is used to spray ammonia water, the function of the steam inlet 11 is to allow steam to enter the desorption tower, the function of the drain port 12 is to discharge the bottom solution of the tower, the function of the exhaust port 13 is to discharge exhaust gas, and the function of the filling port 14 is to add or remove fillers to the packing layer bottom plate.

[0021] The working principle and usage process of the present invention are as follows: first, filler is added to the bottom plate of the packing layer from the packing port 14, the packing port 14 is closed, the steam inlet 11 is opened to allow high-temperature steam to enter the desorption tower body 1, the desorption tower is preheated, the first spray pipe 7 and the second spray pipe 8 are opened, and the ammonia water is combined with the rising high-temperature steam to transfer mass and heat on the sieve plate tray 4. During this period, the motor 63 is started regularly, and the rotation of the rotating shaft 62 is controlled by the engagement of the bevel gear. The thread 622 cooperates with the threaded barrel 65 to control the up and down movement of the threaded barrel 65, thereby controlling the dredging rod 68 on the annular frame 67 to move up and down through the through-hole of the sieve plate tray 4, dredging the through-hole of the sieve plate tray 4 to prevent the through-hole from being fouled and blocked.

[0022] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A urea desorption tower, comprising a desorption tower body (1) and a sieve plate tray (4) installed inside the desorption tower body (1), characterized in that: An anti-scaling structure (6) is provided inside the desorption tower body (1), and the anti-scaling structure (6) comprises a base frame (61) mounted on the inner side wall of the desorption tower body (1) and located below the sieve plate tray (4); a rotating shaft (62) is rotatably mounted between the base frame (61) and the top of the desorption tower body (1); the top end of the rotating shaft (62) passes through the top of the tower and is mounted with a first bevel gear (621); a motor (63) is mounted at a position near the first bevel gear (621) at the top of the desorption tower body (1); a second bevel gear (631) meshing with the first bevel gear (621) is mounted on the output shaft of the motor (63); and a dredging structure is provided between the sieve plate tray (4) and the base frame (61); The dredging structure comprises a limiting groove (64), a threaded barrel (65), a mounting plate (66), an annular frame (67) and a dredging rod (68). A thread (622) is provided on the rotating shaft (62) and located between the sieve plate tray (4) and the base frame (61). A threaded barrel (65) that can cooperate with the thread (622) is sleeved on the thread (622). Four mounting plates (66) are evenly mounted on the outer side of the threaded barrel (65). Four limiting grooves (64) are mounted on the inner side wall of the desorption tower body (1). One end of the four mounting plates (66) is respectively arranged in the four limiting grooves (64). An annular frame (67) is mounted on the mounting plate (66), and a plurality of dredging rods (68) are mounted on the annular frame (67).

2. A urea desorption tower according to claim 1, characterized in that: A first packing layer bottom plate (2), a second packing layer bottom plate (3) and a filter (5) are installed inside the desorption tower body (1); the first packing layer bottom plate (2) and the second packing layer bottom plate (3) are both located above the sieve plate tray (4); a first spray pipe (7) and a second spray pipe (8) are respectively provided above the first packing layer bottom plate (2) and above the second packing layer bottom plate (3); and the filter (5) is located below the base frame (61).

3. A urea desorption tower according to claim 1, characterized in that: The side wall of the desorption tower body (1) is provided with two through holes and is respectively provided with a steam inlet (11) and a liquid discharge port (12). Both the steam inlet (11) and the liquid discharge port (12) are located below the filter (5), and the liquid discharge port (12) is located near the bottom of the tower.

4. A urea desorption tower according to claim 1, characterized in that: A through hole is provided on the top of the desorption tower body (1) and an exhaust port (13) is provided.

5. A urea desorption tower according to claim 1, characterized in that: The side wall of the desorption tower body (1) is provided with two through holes and two filling ports (14), and the two filling ports (14) are respectively located slightly higher than the first filling layer bottom plate (2) and the second filling layer bottom plate (3).

6. A urea desorption tower according to claim 1, characterized in that: The diameter of the dredging rod (68) is slightly smaller than the diameter of the through hole on the sieve plate tray (4), the number of the dredging rods (68) on the annular frame (67) is equal to the number of the through holes on the sieve plate tray (4), and each dredging rod (68) on the annular frame (67) is directly opposite to each through hole on the sieve plate tray (4).

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