Anti-crystallization device for granulation nozzle well

Abstract

The invention relates to the technical field of prilling towers, and particularly discloses a prilling nozzle well anti-crystallization device which comprises a prilling tower, a nozzle well arranged at the top of the prilling tower, a nozzle arranged on the lower side of the nozzle well, a connecting piece connected with the lower side of the nozzle well and an air injection device connected with the lower side of the connecting piece. The air injection device comprises an annular flow dividing pipe, a plurality of air injection pipes arranged on the outer side wall of the flow dividing pipe, an air guide pipe connected with the flow dividing pipe, a pull rod used for connecting the flow dividing pipe and the connecting piece, and an air supply device connected with the air guide pipe. And the nozzle is arranged on the axis of the shunt pipe and is lower than the shunt pipe. The anti-crystallization device for the granulation nozzle well can effectively slow down the formation rate of urea crystals on the nozzle well.

Description

Technical Field

[0001] The invention relates to the technical field of granulation towers, and in particular to a granulation nozzle well anti-crystallization device. Background Art

[0002] Granulation tower is a commonly used equipment for producing granular materials in chemical production. For example, in the production process of urea granules, 99.7% molten urea liquid is pumped to the granulation nozzle, and the molten urea liquid is cut into small droplets of suitable size by the rotating nozzle and distributed on the entire cross section of the granulation tower. These small urea droplets are about 136℃ and are gradually cooled by the air from the bottom to the top through the louver at the bottom of the tower and solidified into urea granules. The granules scattered on the bottom of the granulation tower are transported by a belt conveyor to the packaging or bulk warehouse for stacking.

[0003] The rising air and the molten urea particles cut by the nozzle are dehydrated and cooled during the falling process. The cooled solid particles release a large amount of heat at the same time to form an upward airflow. The remaining water and part of the urine form urea agglomerates similar to "stalactites" around the nozzle well with the upward airflow. This agglomeration is prone to fall randomly from the top of the tower and damage the scraper coating or block the flow channel as the ambient humidity changes. When the "stalactites" grow to a certain extent, they must be cleaned manually. The cleaning cycle is 4 months, which poses a great safety risk. Summary of the invention

[0004] The object of the present invention is to provide a granulation nozzle well anti-crystallization device, which can effectively slow down the formation rate of urea crystals on the nozzle well.

[0005] The present invention is achieved through the following technical scheme: the granulation nozzle well anti-crystallization device of the present invention includes a granulation tower, a nozzle well arranged at the top of the granulation tower, a nozzle arranged at the lower side of the nozzle well, including a connecting piece connected to the lower side of the nozzle well, and an injection device connected to the lower side of the connecting piece; the injection device includes an annular diversion pipe, a plurality of injection pipes arranged on the outer side wall of the diversion pipe, an air guide pipe connected to the diversion pipe, a pull rod for connecting the diversion pipe and the connecting piece, and an air supply device connected to the air guide pipe; the nozzle is arranged on the axis of the diversion pipe and its height is lower than that of the diversion pipe.

[0006] Furthermore, the air jet pipe is arranged to be inclined upward.

[0007] Furthermore, the angle between the air jet pipe and the horizontal plane is 5-15°.

[0008] Furthermore, the jet device also includes an annular support plate surrounding the outer wall of the diverter pipe, and a plurality of through holes provided on the side wall of the support plate; one end of the jet pipe away from the diverter pipe is clamped in the through hole.

[0009] Furthermore, a horizontal and annular connecting ring is fixedly provided on the upper side of the support plate; the pull rod is slidably connected to the connecting ring; an adjusting device for driving the support plate to rise and fall is also included; the connection between the jet pipe and the diverter pipe is a hose.

[0010] Furthermore, the adjusting device includes a limit plate arranged on the pull rod, an airbag mounted on the outer wall of the pull rod, a pressurizing tube connected to the airbag, and an air compressor connected to the pressurizing tube; the lower end of the airbag is fixedly connected to the upper side of the connecting ring, and the upper end of the airbag is fixedly connected to the lower side of the limit plate.

[0011] Furthermore, there are multiple pull rods, and the multiple pull rods are distributed in a circle around the axis of the shunt pipe; the multiple pull rods are divided into first pull rods and second pull rods that are alternately arranged; each of the first pull rods is sleeved with the airbag; each of the second pull rods is sleeved with a spring; the lower end of the spring is fixedly connected to the upper side of the connecting ring, and the upper end of the spring is fixedly connected to the lower side of the limit plate.

[0012] Furthermore, the connecting member includes an annular connecting plate, which is fixedly connected to the lower side of the nozzle well; a connecting piece is provided at the upper end of the pull rod, and the connecting piece is fixedly connected to the connecting plate.

[0013] Furthermore, a pair of the diverter pipes are provided, the pair of the diverter pipes are distributed in the vertical direction, and the outer side walls of the pair of the diverter pipes are both provided with jet pipes; and the pair of the diverter pipes are both connected to the pull rod.

[0014] The technical solution of the present invention has at least the following advantages and beneficial effects: the granulation nozzle well anti-crystallization device of the present invention, during the process of using the nozzle for granulation (urea), a ring-shaped airflow is ejected outward from the upper side of the nozzle through the jet device, and the airflow ejected by the jet pipe in the jet device covers a certain range of the lower surface of the nozzle well, which can prevent the rising airflow from blowing urea to the lower surface of the nozzle well, and also can prevent urea from contacting the lower surface of the nozzle well, thereby reducing or avoiding the formation of urea agglomerates on the surface of the nozzle well, reducing the frequency of cleaning the nozzle well, reducing the workload, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of the granulation nozzle well anti-crystallization device during installation provided by an embodiment of the present invention;

[0016] Figure 2 A schematic diagram of the structure of a granulation nozzle well anti-crystallization device provided in an embodiment of the present invention;

[0017] Figure 3 A schematic diagram of the partial structure inside the granulation nozzle well anti-crystallization device provided in an embodiment of the present invention.

[0018] Icons: 10-nozzle well, 11-connecting plate, 12-nozzle, 20-injection device, 21-diverter pipe, 22-injection pipe, 23-air guide pipe, 24-pull rod, 25-connecting plate, 31-support plate, 32-through hole, 33-connecting ring, 34-limiting plate, 35-air bag, 36-pressurization pipe, 37-spring. DETAILED DESCRIPTION

[0019] Example

[0020] The following is further described in conjunction with specific embodiments. Figure 1 -Attached Figure 3 As shown, the granulation nozzle well anti-crystallization device of this embodiment includes a granulation tower, a nozzle well 10 arranged at the top of the granulation tower, a nozzle 12 arranged at the lower side of the nozzle well 10, including a connecting piece connected to the lower side of the nozzle well 10, and an injection device 20 connected to the lower side of the connecting piece; the injection device 20 includes an annular diverter pipe 21, a plurality of injection pipes 22 arranged on the outer side wall of the diverter pipe 21, an air guide pipe 23 connected to the diverter pipe 21, a pull rod 24 for connecting the diverter pipe 21 and the connecting piece, and an air supply device connected to the air guide pipe 23; the nozzle 12 is arranged on the axis of the diverter pipe 21 and its height is lower than the diverter pipe 21. Specifically, in the process of using the nozzle 12 to granulate (urea), an annular airflow is ejected outward from the top of the nozzle 12 through the jet device 20, and the airflow ejected by the jet pipe 22 in the jet device 20 covers a certain range of the lower surface of the nozzle well 10, which can prevent the rising airflow from blowing urea to the lower surface of the nozzle well 10, and can also prevent urea from contacting the lower surface of the nozzle well 10, thereby reducing or avoiding urea from forming urea agglomerates on the surface of the nozzle well 10, reducing the frequency of cleaning the nozzle well 10, reducing the workload, and improving production efficiency. The shunt pipe 21 can evenly distribute the airflow of the air supply device to the jet pipe 22, so that an airflow that blocks urea from the nozzle well 10 is generated in a certain annular area outside the nozzle 12.

[0021] The jet pipe 22 in this embodiment is tilted upward. The angle between the jet pipe 22 and the horizontal plane is 5-15 degrees. Specifically, this allows the airflow generated by the jet device 20 to be closer to the lower surface of the nozzle well 10, and can also minimize the impact of the airflow on the granulation of the nozzle 12.

[0022] The jet device 20 in this embodiment further includes an annular support plate 31 disposed around the outer wall of the shunt pipe 21, and a plurality of through holes 32 disposed on the side wall of the support plate 31; one end of the jet pipe 22 away from the shunt pipe 21 is clamped in the through hole 32. Specifically, the jet pipe 22 can be supported by the support plate 31.

[0023] The support plate 31 in this embodiment is fixed with a horizontal and annular connecting ring 33 on the upper side; the pull rod 24 is slidably connected to the connecting ring 33; and an adjusting device for driving the support plate 31 to rise and fall is also included; the connection between the jet pipe 22 and the shunt pipe 21 is a hose. Specifically, by adjusting the rise and fall of the support plate 31, the inclination angle of the jet pipe 22 can be adjusted, so that different granulation periods can be coped with. For example, in the early stage of granulation, the nozzle well 10 is fully cleaned, so there is almost no urea crystal on its surface. As the granulation proceeds, urea crystals will gradually accumulate on the nozzle well 10 (the jet of this device can only delay the formation of urea crystals as much as possible, and cannot guarantee that it is completely eliminated). When the urea on the nozzle well 10 gradually becomes thicker, the angle of the jet pipe 22 can be lowered so that the airflow ejected from the jet pipe 22 gradually moves downward, which can better slow down the formation of urea crystals and significantly extend the cleaning cycle of the nozzle well 10.

[0024] The adjusting device in this embodiment includes a limit plate 34 arranged on the pull rod 24, an air bag 35 sleeved on the outer wall of the pull rod 24, a pressurizing tube 36 connected to the air bag 35, and an air compressor connected to the pressurizing tube 36; the lower end of the air bag 35 is fixedly connected to the upper side of the connecting ring 33, and the upper end of the air bag 35 is fixedly connected to the lower side of the limit plate 34. Specifically, the air bag 35 is inflated (or inhaled) by the air compressor and the pressurizing tube 36, so that the air bag 35 expands (or contracts), and then the connecting ring 33 and the support plate 31 are pulled down (or up) by the air bag 35. Since the end of the jet pipe 22 is stuck in the through hole 32 of the support plate 31, and the end of the jet pipe 22 connected to the diverter pipe 21 is immovable (because it is a hose structure, it will only bend), the angle between the jet pipe 22 and the horizontal plane can be driven to decrease (increase) through the support plate 31. Thereby, the purpose of adjusting the jet angle and height of the jet pipe 22 is achieved.

[0025] In this embodiment, there are multiple tie rods 24, which are distributed in a circle around the axis of the shunt pipe 21; the multiple tie rods 24 are divided into first tie rods 24 and second tie rods 24 that are alternately arranged; each first tie rod 24 is sleeved with an air bag 35; each second tie rod 24 is sleeved with a spring 37; the lower end of the spring 37 is fixedly connected to the upper side of the connecting ring 33, and the upper end of the spring 37 is fixedly connected to the lower side of the limit plate 34. Specifically, the support plate 31 and the connecting ring 33 can be pulled up by the spring 37, and the support plate 31 and the connecting ring 33 can be pressed down by the expansion of the air bag 35, so that the lifting and lowering of the support plate 31 and the connecting ring 33 can be better adjusted, thereby adjusting the inclination angle of the jet pipe 22.

[0026] The connecting piece in this embodiment includes an annular connecting plate 11 , which is fixedly connected to the lower side of the nozzle well 10 ; a connecting piece 25 is provided at the upper end of the pull rod 24 , and the connecting piece 25 is fixedly connected to the connecting plate 11 .

[0027] In this embodiment, a pair of diverter pipes 21 are provided. The pair of diverter pipes 21 are distributed in the vertical direction. The outer side walls of the pair of diverter pipes 21 are both provided with jet pipes 22 . The pair of diverter pipes 21 are both connected to the pull rod 24 .

[0028] In summary, the granulation nozzle well anti-crystallization device of this embodiment, during the process of using the nozzle 12 for granulation (urea), an annular airflow is ejected outward from the upper side of the nozzle 12 through the jet device 20, and the airflow ejected by the jet pipe 22 in the jet device 20 covers a certain range of the lower surface of the nozzle well 10, which can block the rising airflow from blowing urea to the lower surface of the nozzle well 10, and also can block the urea from contacting the lower surface of the nozzle well 10, thereby reducing or avoiding the formation of urea agglomerates on the surface of the nozzle well 10, reducing the frequency of cleaning the nozzle well 10, reducing workload, and improving production efficiency.

[0029] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A granulation nozzle well anti-crystallization device, comprising a granulation tower, a nozzle well (10) arranged at the top of the granulation tower, and a nozzle (12) arranged at the lower side of the nozzle well (10), characterized in that: It comprises a connecting piece connected to the lower side of the nozzle well (10), and an injection device (20) connected to the lower side of the connecting piece; The jet device (20) comprises an annular shunt pipe (21), a plurality of jet pipes (22) arranged on the outer wall of the shunt pipe (21), an air guide pipe (23) connected to the shunt pipe (21), a pull rod (24) for connecting the shunt pipe (21) and the connecting member, and an air supply device connected to the air guide pipe (23); The nozzle (12) is arranged on the axis of the diverter pipe (21) and is lower in height than the diverter pipe (21).

2. The granulation nozzle well anti-crystallization device according to claim 1 is characterized in that: The air injection pipe (22) is arranged to be inclined upward.

3. The granulation nozzle well anti-crystallization device according to claim 2 is characterized in that: The angle between the air jet pipe (22) and the horizontal plane is 5-15°.

4. The granulation nozzle well anti-crystallization device according to claim 1 is characterized in that: The jetting device (20) further comprises an annular support plate (31) arranged around the outer wall of the diverter tube (21), and a plurality of through holes (32) arranged on the side wall of the support plate (31); one end of the jetting tube (22) away from the diverter tube (21) is clamped in the through hole (32).

5. The granulation nozzle well anti-crystallization device according to claim 4 is characterized in that: A horizontal and annular connecting ring (33) is fixedly provided on the upper side of the supporting plate (31); the pull rod (24) is slidably connected to the connecting ring (33); It also includes an adjusting device for driving the support plate (31) to rise and fall; the connection between the jet pipe (22) and the diverter pipe (21) is a hose.

6. The granulation nozzle well anti-crystallization device according to claim 5 is characterized in that: The regulating device comprises a limit plate (34) arranged on the pull rod (24), an air bag (35) sleeved on the outer wall of the pull rod (24), a pressurizing tube (36) connected to the air bag (35), and an air compressor connected to the pressurizing tube (36); The lower end of the airbag (35) is fixedly connected to the upper side of the connecting ring (33), and the upper end of the airbag (35) is fixedly connected to the lower side of the limiting plate (34).

7. The granulation nozzle well anti-crystallization device according to claim 6 is characterized in that: The pull rods (24) are provided in plurality, and the plurality of pull rods (24) are distributed in a circular pattern around the axis of the diverter pipe (21); The plurality of pull rods (24) are divided into alternately arranged first pull rods (24) and second pull rods (24); each of the first pull rods (24) is sleeved with the airbag (35); each of the second pull rods (24) is sleeved with a spring (37); the lower end of the spring (37) is fixedly connected to the upper side of the connecting ring (33), and the upper end of the spring (37) is fixedly connected to the lower side of the limiting plate (34).

8. The granulation nozzle well anti-crystallization device according to claim 1 is characterized in that: The connecting member comprises an annular connecting plate (11), and the connecting plate (11) is fixedly connected to the lower side of the nozzle well (10); a connecting piece (25) is provided at the upper end of the pull rod (24), and the connecting piece (25) is fixedly connected to the connecting plate (11).

9. The granulation nozzle well anti-crystallization device according to claim 1, characterized in that: A pair of the diverter pipes (21) are provided, the pair of the diverter pipes (21) are distributed in the vertical direction, and the outer side walls of the pair of the diverter pipes (21) are both provided with jet pipes (22); the pair of the diverter pipes (21) are both connected to the pull rod (24).

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