Online iron removal device for urea hydrolyzer

Abstract

The utility model relates to an online iron removal device for a urea hydrolyzer. Comprising a buffer tank with an inlet and an outlet, a lifting base plate, a plurality of magnetic sleeves located at the bottom of the lifting base plate, a lifting connecting plate and a plurality of strong magnetic bars located at the bottom of the lifting connecting plate, an annular top plate is installed at the top of the buffer tank, and the bottom of each magnetic sleeve is sealed and the top of each magnetic sleeve is open; the combined separation swing assembly drives the lifting base plate and the lifting connecting plate to ascend, descend and swing, during combination, the annular top plate, the lifting base plate and the lifting connecting plate are stacked, the strong magnetic rods are located in the corresponding magnetic sleeves, and the magnetic sleeves are located in an inner cavity of the buffer tank; during separation, the magnetic sleeves are separated from the inner cavity of the buffer tank, and the strong magnetic bars are separated from the magnetic sleeves. The utility model provides an on-line iron removal device for a urea hydrolyzer, which has the function of automatically discharging intercepted iron, reduces the labor cost, improves the treatment efficiency and reduces the adverse effect of the iron discharging link on the operation of the urea hydrolyzer.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of impurity removal device, especially relates to an on-line iron removal device for urea hydrolyzer. BACKGROUND

[0002] The existing urea hydrolysis ammonia production process is that urea particles are added into a dissolving tank to be dissolved into urea solution with a mass concentration of 50%, and then are transported to a urea hydrolyzer, under the action of steam at 0.8 Mpa and below 180 DEG C, urea in the hydrolysis reactor is hydrolyzed to generate ammonia, water and carbon dioxide, the product is subjected to pressure reduction and flow control to enter an SCR denitration system, and ammonia is prepared.

[0003] In the production process of urea, iron is usually used as a catalyst, so urea usually contains a certain amount of iron, and widely used industrial urea usually contains about 50-100 mg / kg of iron, and some very high-quality industrial urea even contains as high as 300 mg / kg of iron. After the existing urea hydrolyzer is operated for a long time, a layer of dark red iron oxide film is formed and attached to the pipe wall of the urea hydrolyzer, which affects the heat exchange efficiency and the service life of the equipment, so it is usually necessary to configure an on-line iron removal device for the urea hydrolysis system pipeline to solve the above technical problems by removing iron from the urea solution. The common way of removing iron is strong magnetic iron removal, liquid or powder raw materials pass through strong magnetic magnetic rods, and the iron components contained therein are adsorbed and intercepted, and the intercepted iron is removed from the system by regular disassembly and cleaning. However, the existing iron removal device needs human intervention to disassemble and clean the device, which is low in operation efficiency and high in labor cost. In summary, a new type of on-line iron removal device for urea hydrolyzer needs to be developed and designed to solve the above problems. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing an on-line iron removal device for urea hydrolyzer, which has the function of automatically discharging intercepted iron, does not need manual maintenance, reduces labor cost and improves processing efficiency, and reduces the adverse effects of iron removal on the operation of the urea hydrolyzer.

[0005] The utility model adopts the technical scheme of an on-line iron removal device for urea hydrolyzer, which comprises a buffer tank with an inlet and an outlet, an annular top plate is installed on the top of the buffer tank, a plurality of magnetic guide sleeves are arranged on the bottom of the lifting base plate, the bottom of each magnetic guide sleeve is sealed, and the top is open, a plurality of strong magnetic rods are arranged on the bottom of the lifting connecting plate, a combined separation swing assembly is arranged to drive the lifting base plate and the lifting connecting plate to perform lifting and swinging actions, when combined, the annular top plate, the lifting base plate and the lifting connecting plate are stacked, the strong magnetic rods are located in the corresponding magnetic guide sleeves, and each magnetic guide sleeve is located in the inner cavity of the buffer tank, and when separated, each magnetic guide sleeve is separated from the inner cavity of the buffer tank, and the strong magnetic rods are separated from the magnetic guide sleeves.

[0006] Preferably, a sealing gasket is installed at the bottom edge of the lifting base plate, and in the combined state, the sealing gasket seals between the annular top plate and the lifting base plate.

[0007] Preferably, the combined separation swing assembly comprises a cage-shaped frame with a guide mechanism mounted at the top, the cage-shaped frame is fixedly connected with the side of the buffer tank, a lifting support rod with a square cross section is arranged in the guide mechanism, the upper end of the lifting support rod is connected with the lifting base plate through a middle connecting arm, a first jacking cylinder for driving the lifting support rod to lift and displace is installed at the bottom of the cage-shaped frame, and a second jacking cylinder is installed on the middle connecting arm, the upper end of the piston rod of the second jacking cylinder is connected with the lifting connecting plate through an upper connecting arm.

[0008] Preferably, a I-shaped connecting block is installed at the lower end of the lifting support rod, a U-shaped connecting seat is installed at the upper end of the piston rod of the first jacking cylinder, the connecting block is located inside the connecting seat and is connected by a pin; the swing assembly further comprises a swing arm and a swing cylinder, a square shaft hole is arranged in the middle of the swing arm and the lifting support rod passes through the square shaft hole, and the end of the piston rod of the swing cylinder is hingedly connected with the end of the swing arm.

[0009] Preferably, the guide mechanism and the cage-shaped frame are fixedly connected with the side of the buffer tank through a lower connecting arm, and a window allowing the cylinder body of the second jacking cylinder to pass through is further arranged in the middle of the lower connecting arm.

[0010] Preferably, the height of the inlet is lower than that of the outlet, and the center lines of the inlet and the outlet are parallel.

[0011] The advantages and positive effects of the online iron removal device are as follows:

[0012] The online iron removal device comprises a buffer tank, a plurality of magnetic sleeves, a plurality of strong magnetic rods, a guide mechanism, a cage-shaped frame, a lifting support rod, a first jacking cylinder, a second jacking cylinder, a lifting base plate, a lifting connecting plate, a middle connecting arm, an upper connecting arm, a swing arm and a swing cylinder.

[0013] Therefore, the online iron removal device has the function of automatically discharging the intercepted iron, does not need manual maintenance, reduces the labor cost and improves the processing efficiency, and reduces the adverse effects of the iron discharge link on the operation of the urea hydrolyzer. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of this utility model, showing the separated state;

[0015] Figure 2 This is a three-dimensional structural diagram of the main body of this utility model;

[0016] Figure 3 yes Figure 1 A three-dimensional structural diagram of the combined oscillating component.

[0017] In the picture:

[0018] 1. Import; 2. Buffer tank; 3. Export; 4. Annular top plate; 5. Magnetic sleeve; 6. Sealing gasket; 7. Lifting base plate; 8. Strong magnetic rod; 9. Lifting connecting plate; 10. Upper connecting arm; 11. Middle connecting arm; 12. Second lifting cylinder; 13. Lifting support rod; 14. Guide mechanism; 15. Swing arm; 16. Swing cylinder; 17. Connecting seat; 18. Cage frame; 19. Lower connecting arm; 20. First lifting cylinder; 21. Connecting block. Detailed Implementation

[0019] To further understand the invention content, features and effects of this utility model, the following embodiments are provided in detail.

[0020] Please see Figure 1 and Figure 2 This utility model discloses an online iron removal device for a urea hydrolyzer, comprising a buffer tank 2 with an inlet 1 and an outlet 3, and an annular top plate 4 installed on the top of the buffer tank 2. This online iron removal device uses inlet 1 and outlet 3 connected to the pre-pipeline of the urea hydrolyzer. Urea easily enters the buffer tank 2 through inlet 1, exits through outlet 3, and then enters the urea hydrolyzer. Flanges are provided on both inlet 1 and outlet 3 to facilitate connection with the pipeline.

[0021] In this embodiment, the height of inlet 1 is lower than the height of outlet 3, and the centerlines of inlet 1 and outlet 3 are parallel.

[0022] It also includes a lifting base plate 7 and multiple magnetic sleeves 5 located at its bottom. Each magnetic sleeve 5 has a sealed bottom and an open top. The lifting base plate 7 fixes the tops of each magnetic sleeve 5 together to form a whole. As shown in the figure, there are six magnetic sleeves 5, located at six fixed points on a regular hexagon. The magnetic sleeves 5 are made of a magnetically conductive material that does not possess or generate magnetism itself, such as fiberglass (glass fiber reinforced plastic) or phenolic resin.

[0023] The lifting connecting plate 9 is fixedly connected with the top of each strong magnetic rod 8 to form a whole, and the position of each strong magnetic rod 8 vertically corresponds to the position of each magnetic guide sleeve 5 below. The outer diameter of each strong magnetic rod 8 is slightly smaller than the inner diameter of each magnetic guide sleeve 5. When the strong magnetic rod 8 is inserted into the magnetic guide sleeve 5, the iron is magnetically adsorbed on the outer wall of the magnetic guide sleeve 5. When the iron needs to be separated from the outer wall of the magnetic guide sleeve 5, the strong magnetic rod 8 is pulled out of the magnetic guide sleeve 5.

[0024] The combined separation swing assembly is used to drive the lifting base plate 7 and the lifting connecting plate 9 to lift and swing. When combined, the annular top plate 4, the lifting base plate 7 and the lifting connecting plate 9 are stacked, the strong magnetic rod 8 is located in the corresponding magnetic guide sleeve 5, and each magnetic guide sleeve 5 is located in the inner cavity of the buffer tank 2. When separated, each magnetic guide sleeve 5 is separated from the inner cavity of the buffer tank 2, and the strong magnetic rod 8 is separated from the magnetic guide sleeve 5.

[0025] In this embodiment, the sealing gasket 6 is installed at the bottom edge of the lifting base plate 7. When combined, the sealing gasket 6 plays a sealing role between the annular top plate 4 and the lifting base plate 7, and the urea solution in the buffer tank 2 cannot be discharged between the annular top plate 4 and the lifting base plate 7.

[0026] Please refer to Figure 3 It can be seen that:

[0027] The combined separation swing assembly includes a cage-shaped frame 18 provided with a guide mechanism 14 at the top. The guide mechanism 14 and the cage-shaped frame 18 are fixedly connected with the side of the buffer tank 2.

[0028] The lifting support rod 13 with a square cross section is arranged in the guide mechanism 14. The upper end of the lifting support rod 13 is connected with the lifting base plate 7 through the middle connecting arm 11. The first jacking cylinder 20 is installed at the bottom of the cage-shaped frame 18 to drive the lifting support rod 13 to lift and shift. The second jacking cylinder 12 is installed on the middle connecting arm 11, and the upper end of the piston rod of the second jacking cylinder 12 is connected with the lifting connecting plate 9 through the upper connecting arm 10.

[0029] The guide mechanism 14 is used to provide a guide function for the lifting support rod 13. In structure, the guide mechanism 14 includes an outer shell fixedly connected with the top of the cage-shaped frame 18. A bearing is installed in the outer shell. The inner ring of the bearing has a square shaft hole, and the lifting support rod 13 is located in the square shaft hole. In this way, the lifting support rod 13 can lift and shift, and can also rotate.

[0030] A connecting block 21 in the shape of an I-beam is installed at the lower end of the lifting support rod 13, and a connecting seat 17 in the shape of a U-beam is installed at the upper end of the piston rod of the first lifting cylinder 20, the connecting block 21 is located inside the connecting seat 17 and connected by a pin. Specifically, the connecting block 21 is placed in the connecting seat 17, two pins are installed on the connecting seat 17, and the inner ends of the pins are located in the grooves of the connecting block 21. In this way, when the piston rod of the first lifting cylinder 20 performs an extension and retraction action, the lifting and driving effect of the lifting support rod 13 can be achieved through the cooperation between the connecting block 21 and the connecting seat 17, and at the same time, the connecting block 21 can rotate in the connecting seat 17, that is, the connecting mode of the connecting block 21 and the connecting seat 17 allows the lifting support rod 13 to rotate.

[0031] It also includes a swing arm 15 and a swing cylinder 16, a square shaft hole is provided in the middle of the swing arm 15 and the lifting support rod 13 passes through the square shaft hole, the end of the piston rod of the swing cylinder 16 is hingedly connected with the end of the swing arm 15, and the end of the cylinder body of the swing cylinder 16 is hingedly connected with another rack. By controlling the piston rod of the swing cylinder 16 to perform an extension and retraction action, the technical effect of driving the lifting support rod 13 to rotate by the swing arm 15 is achieved, so that the lifting base plate 7 and the magnetic sleeve 5, the lifting connecting plate 9 and the strong magnetic rod 8 can swing to the side to move away from the upper part of the buffer tank 2, and then swing back after the iron is removed.

[0032] In this embodiment, the guide mechanism 14 and the cage-shaped frame 18 are both fixedly connected with the side of the buffer tank 2 by the lower connecting arm 19, and a window is further provided in the middle of the lower connecting arm 19 to allow the cylinder body of the second lifting cylinder 12 to pass through.

[0033] Operation mode:

[0034] The online iron removal device is connected to the front pipeline of the urea hydrolyzer, and the urea solution passes through the buffer tank; in the initial state, the combined and separated swing assembly is fully contracted, at this time, it is in the combined state, the annular top plate 4, the lifting base plate 7 and the lifting connecting plate 9 are stacked, the strong magnetic rod 8 is located in the corresponding magnetic sleeve 5, and each magnetic sleeve 5 is located in the inner cavity of the buffer tank 2, the urea solution passes through between each magnetic sleeve 5, and the iron is adsorbed on the outer wall of the magnetic sleeve 5 under the action of the magnetic force;

[0035] After a certain period of time, the iron needs to be separated from the system, at this time, the valve on the urea solution pipeline should be closed first to stop the transportation of the urea solution;

[0036] The piston rod of the first lifting cylinder 20 of the combined swing assembly is extended, and the lifting base plate 7 and its magnetic guide sleeve 5, the lifting connecting plate 9 and its strong magnetic rod 8 in the combined state are lifted as a whole, and finally the magnetic guide sleeve 5 is completely separated from the buffer tank 2. Then the swing cylinder 16 is actuated, and the lifting base plate 7 and its magnetic guide sleeve 5, the lifting connecting plate 9 and its strong magnetic rod 8 in the combined state are swung to the side position, that is, away from the upper side of the buffer tank 2. Then the piston rod of the second lifting cylinder 12 is extended, and each strong magnetic rod 8 is extracted from the magnetic guide sleeve 5 until it is completely separated. Then the magnetic guide sleeve 5 loses the magnetic force, and the iron on the outer wall is separated from the magnetic guide sleeve 5 under the action of gravity. At this time, small amplitude and high frequency vibrations can also be applied by the swing cylinder 16 to promote the separation of the iron from the magnetic guide sleeve 5. After the iron is separated, the reverse process of the above-mentioned operation is performed to restore the online iron removal device to the combined state. Then the pipeline valve can be opened, and the urea solution can be restored to be transported.

Claims

1. An on-line iron removal device for urea hydrolysis, characterized by: The utility model provides a kind of buffer tank (2) comprising inlet (1) and outlet (3), annular top plate (4) is installed on the top of buffer tank (2), it further includes lifting base plate (7) and the plurality of magnetic sleeve (5) at its bottom, the bottom of each magnetic sleeve is sealed, and the top is open, it further includes lifting connecting plate (9) and the plurality of strong magnetic bar (8) at its bottom;It further includes combined separation swing assembly for driving lifting base plate (7) and lifting connecting plate (9) to lift and swing, when combining, annular top plate (4), lifting base plate (7) and lifting connecting plate (9) are stacked, and strong magnetic bar (8) is located in corresponding magnetic sleeve (5), each magnetic sleeve (5) is located in the inner cavity of buffer tank (2), when separating, each magnetic sleeve (5) is separated from the inner cavity of buffer tank (2), and strong magnetic bar (8) is separated from magnetic sleeve (5).

2. The urea hydrolyzer on-line iron removal device according to claim 1, characterized in that: Sealing washer (6) is installed on the bottom edge of lifting base plate (7), and sealing washer (6) plays a sealing role between annular top plate (4) and lifting base plate (7) when being combined.

3. The urea hydrolyzer on-line iron removal device of claim 2, characterized in that: Combined separation swing assembly includes cage frame (18) with guiding mechanism (14) installed on the top, cage frame (18) is fixedly connected with the side of buffer tank (2), lifting support rod (13) with square section is arranged in guiding mechanism (14), the upper end of lifting support rod (13) is connected with lifting base plate (7) through middle connecting arm (11), first jacking cylinder (20) for driving lifting support rod (13) to lift and shift is installed on the bottom of cage frame (18), second jacking cylinder (12) is installed on middle connecting arm (11), and the upper end of the piston rod of second jacking cylinder (12) is connected with lifting connecting plate (9) through upper connecting arm (10).

4. The urea hydrolyzer on-line iron removal device of claim 3, characterized in that: I-shaped connecting block (21) is installed on the lower end of lifting support rod (13), U-shaped connecting seat (17) is installed on the upper end of the piston rod of first jacking cylinder (20), connecting block (21) is located in the interior of connecting seat (17) and is connected by pin;It further includes swing arm (15) and swing cylinder (16), square shaft hole is arranged in the middle of swing arm (15), and lifting support rod (13) passes through the square shaft hole, and the end of the piston rod of swing cylinder (16) is hingedly connected with the end of swing arm (15).

5. The urea hydrolyzer on-line iron removal device of claim 4, characterized by: Guiding mechanism (14) and cage frame (18) are fixedly connected with the side of buffer tank (2) by lower connecting arm (19), and window is arranged in the middle of lower connecting arm (19) to allow the cylinder body of second jacking cylinder (12) to pass through.

6. The urea hydrolyzer on-line iron removal device of claim 5, characterized by: The height of inlet (1) is lower than the height of outlet (3), and the center lines of inlet (1) and outlet (3) are parallel.

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