Urea prilling tower scraping arm hump restraining device

Abstract

The utility model discloses a hump restraining device for a scraping arm of a urea prilling tower. Comprising a connecting top column, the connecting top column is a horizontally-arranged triangular prism, the other two side edges of the bottom of the connecting top column are each fixedly provided with a connecting plate, and the inner side of the bottom of each connecting plate is fixedly provided with a side cover; a plurality of ultrasonic vibrators are mounted on the inner side of the middle part of each connecting plate; in the rotating process of the scraper, the ultrasonic vibrator is started to drive the side cover to vibrate, a viscous urea solution attached to the outer surface of the side cover can flow down along the outer surface of the side cover under the action of vibration, and the viscous urea solution can be effectively prevented from being cooled on the outer surface of the side cover to generate humps; and in the operation process, medium-pressure air can be blown out from the air blowing pipe, the viscous urea solution is quickly blown off from the side cover, the contact time of the viscous urea solution and the side cover is shortened, and the viscous urea solution is prevented from being cooled and solidified on the outer surface of the side cover in the process of flowing down from the side cover.

Description

Technical field:

[0001] The utility model relates to the field of urea production equipment, in particular to a hump suppression device for a scraper arm of a urea granulation tower. Background technology:

[0002] In the urea production process, the molten urea solution is sent to the granulation tower for granulation. The molten urea droplets fall from the top of the tower for dehydration and cooling. The bottom of the granulation tower is cone-shaped. The dried urea granules roll down the slope of the bottom of the granulation tower into the feed pipe. To ensure that all urea granules can enter the feed pipe, such as Figure 1 As shown, a scraper is installed at the bottom of the granulation tower, and the scraper arm of the scraper rotates continuously to push the cooled and formed urea granules falling to the bottom of the tower to the discharge pipe.

[0003] During the urea granule forming process, due to insufficient mass transfer time or failure of individual nozzles, the urea granules may fall to the bottom of the tower before they are completely cooled and solidified. The scraper arm of the scraper rotates continuously, and the urea granules at the bottom of the granulation tower and in the process of falling collide with the hard surface of the scraper arm and break, causing the internal viscous liquid to adhere to the scraper arm. Since the distribution of urea particles at the bottom of the tower is uneven, there is only a small amount of urea near the tower wall, and most of it is in the annular area 2 to 7 meters away from the center of the bottom of the tower. Therefore, as the running time goes by, the amount of urea particles contacted by the scraper in this area is huge, and the viscous urine adheres to the scraper arm of the scraper to form a hump. The hump will form quickly in a short time, especially in summer. When it is too heavy, it will increase the load of the scraper, cause damage to the transmission mechanism, and affect normal production; and the hump is too large, and a large number of urea granules will be crushed during the rotation of the scraper arm, resulting in an increase in particles, affecting the quality of urea products, and the broken urea granules will also shed more dust, increasing the load of the dust removal device and affecting the service life of the dust removal device. Utility model content:

[0004] The utility model aims to provide a hump suppression device for a scraper arm of a urea granulation tower.

[0005] The utility model is implemented by the following technical solutions:

[0006] A urea granulation tower scraper arm hump suppression device comprises a connecting top column, the connecting top column is a horizontally arranged triangular prism, one side edge of the connecting top column is upward, a connecting plate is fixed to the other two side edges at the bottom of the connecting top column, and a side cover is fixed to the inner side of the bottom of each connecting plate;

[0007] A plurality of pipe grooves are provided at the connection between each of the connecting plates and the side covers along the length direction of the connecting top column, and an air blowing pipe is inserted in each of the pipe grooves, and the exhaust port of the air blowing pipe is arranged parallel to the side cover, and the air blowing pipes inserted in the pipe grooves on the connecting plate are all connected to a medium-pressure air pipe;

[0008] A plurality of ultrasonic vibrators are installed on the inner side of the middle part of each connecting plate.

[0009] Preferably, a rounded corner is provided on the top of the connecting top column.

[0010] Preferably, a plurality of support rods are fixed to the inner side of the top of each side cover, and a felt pad is fixed to the end of the support rod in contact with the scraper arm.

[0011] Preferably, the lower end of the side cover is bent inwardly by 180°.

[0012] The advantages of the utility model are as follows: during the rotation of the scraper, the ultrasonic vibrator is started to drive the side cover to vibrate, and the viscous urea solution attached to the outer surface of the side cover will flow down along the outer surface of the side cover under the action of the vibration, which can effectively prevent the viscous urea solution from cooling on the outer surface of the side cover to form a hump; and during operation, medium-pressure air is blown out from the air blow pipe to quickly blow the viscous urea solution off the side cover, shortening the contact time between the viscous urea solution and the side cover, and preventing the viscous urea solution from cooling and solidifying on the outer surface of the side cover during the process of flowing down the side cover. Description of the drawings:

[0013] Figure 1 It is a schematic diagram of the structure of the bottom of the granulation tower;

[0014] Figure 2 It is a structural schematic diagram of the utility model;

[0015] Figure 3 yes Figure 2 AA cross-section diagram;

[0016] Figure 4 yes Figure 3 A partial enlarged view of

[0017] Figure 5 yes Figure 2 BB cross-section diagram;

[0018] Figure 6 yes Figure 5 A partial enlarged view of B;

[0019] Figure 7 yes Figure 2 CC cross-section diagram;

[0020] Figure 8 yes Figure 7A partial enlarged view of C;

[0021] Fig. 9 It is a schematic diagram of the connection between the side cover and the support rod;

[0022] Fig.10 It is a schematic diagram of the structure inside the connecting plate.

[0023] In the figure: connecting top column 1, connecting plate 2, side cover 3, pipe groove 4, air blowing pipe 5, medium pressure air pipe 6, ultrasonic vibrator 7, support rod 8, scraper arm 9. Specific implementation method:

[0024] like Figures 2 to 10 As shown, a urea granulation tower scraper arm hump suppression device comprises a connecting top column 1, the connecting top column 1 is a horizontally arranged triangular prism, one side edge of the connecting top column 1 is upward, and a connecting plate 2 is fixed to the other two side edges at the bottom of the connecting top column 1, and a side cover 3 is fixed to the inner side of the bottom of each connecting plate 2; a plurality of pipe grooves 4 are opened along the length direction of the connecting top column 1 at the connection between each connecting plate 2 and the side cover 3, and a blowing pipe 5 is inserted in each pipe groove 4, and the exhaust port of the blowing pipe 5 is arranged parallel to the side cover 3, and the blowing pipe 5 inserted in the pipe groove 4 on a connecting plate 2 is connected to a medium-pressure air pipe 6; a plurality of ultrasonic vibrators 7 are installed on the inner side of the middle part of each connecting plate 2;

[0025] When in use, the device is fixed to the top of the scraper arm 910 of the scraper, so that the connecting top column 1 and the scraper arm 910 are fixed. During the rotation of the scraper, the ultrasonic vibrator 7 is started, driving the side cover 3 to vibrate. The viscous urea solution attached to the outer surface of the side cover 3 will flow down along the outer surface of the side cover 3 under the action of vibration, which can effectively prevent the viscous urea solution from cooling on the outer surface of the side cover 3 to form a hump;

[0026] Moreover, during operation, medium-pressure air is blown out from the air blowing pipe 5, and the exhaust port of the air blowing pipe 5 is downward, so that the viscous urea solution is quickly blown off from the side cover 3, thereby shortening the contact time between the viscous urea solution and the side cover 3, and preventing the viscous urea solution from cooling and solidifying on the outer surface of the side cover 3 during the process of flowing down the side cover 3;

[0027] The pipe grooves 4 are mainly opened on the connecting plate 2 at a distance of 2 to 7 meters from the center of the tower bottom. The adjacent pipe grooves 4 are spaced 0.15-0.5 meters apart. The specific spacing distance can be set according to the residual urea agglomeration on the outer surface of the side cover 3.

[0028] The blowing pipes 5 inserted in the pipe grooves 4 on a connecting plate 2 are connected to a medium-pressure air pipe 6. The medium-pressure air pipe 6 rotates with the scraper arm 910 and is connected to the air source through a rotating joint. When in use, the medium-pressure air pipe 6 is placed in the gap between the device and the scraper arm 910.

[0029] The top of the connecting top column 1 is provided with a rounded corner. When the urea granules fall to the top of the device, the rounded corner can prevent the urea granules from directly colliding with the tip, thereby reducing the probability of the urea granules being broken.

[0030] A number of support rods 8 are fixed on the inner side of the top of each side cover 3, and a felt pad is fixed on the end of the support rod 8 that contacts the scraper arm 910. The support rod 8 can support the bottom of the side cover 3 to prevent the bottom of the side cover 3 from being blocked by the agglomerated urea and then deformed during rotation; the felt pad can prevent the support rod 8 from making rigid contact with the scraper arm 910, thereby protecting the scraper arm 910.

[0031] The lower end of the side cover 3 is bent inwardly by 180° to enhance the anti-bending effect of the lower end of the side cover 3 and prevent the side cover 3 from being deformed.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A urea granulation tower scraper arm hump suppression device, characterized in that: It includes a connecting top column, which is a horizontally arranged triangular prism, one side edge of the connecting top column is upward, and a connecting plate is fixed to the other two side edges at the bottom of the connecting top column, and a side cover is fixed to the inner side of the bottom of each connecting plate; A plurality of pipe grooves are provided at the connection between each of the connecting plates and the side covers along the length direction of the connecting top column, and an air blowing pipe is inserted in each of the pipe grooves, and the exhaust port of the air blowing pipe is arranged parallel to the side cover, and the air blowing pipes inserted in the pipe grooves on the connecting plate are all connected to a medium-pressure air pipe; A plurality of ultrasonic vibrators are installed on the inner side of the middle part of each connecting plate.

2. A urea granulation tower scraper arm hump suppression device according to claim 1, characterized in that: The top of the connecting top column is provided with a rounded corner.

3. A urea granulation tower scraper arm hump suppression device according to claim 1 or 2, characterized in that: A plurality of support rods are fixed on the inner side of the top of each side cover, and a felt pad is fixed on the end of the support rod that contacts the scraper arm.

4. A urea granulation tower scraper arm hump suppression device according to claim 3, characterized in that: The lower end of the side cover is bent inwardly by 180 degrees.

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