Marine urea aqueous solution preparation device and preparation method therefor

Abstract

A marine urea aqueous solution preparation device, and a preparation method therefor. The marine urea aqueous solution preparation device comprises a water bath barrel (1), a preparation barrel (2) fixed to an inner wall of the bottom of the water bath barrel (1) by means of a support leg, and a gap between the water bath barrel (1) and the preparation barrel (2) is used to contain fresh water to heat the preparation barrel (2). A top cover (6) is fixed to the top of the preparation barrel (2) by means of multiple bolts, and multiple heaters (11) are fixed to an inner wall of the water bath barrel (1). The urea aqueous solution is stirred by means of a stirring rod (3), which can sequentially drive a swinging structure and an intermittent structure, so that urea particles are intermittently sprinkled into the preparation barrel (2) in small batches.

Description

Marine urea aqueous solution preparation equipment and preparation method thereof Technical Field

[0001] The present invention relates to the technical field of urea aqueous solution production equipment, and in particular to a marine urea aqueous solution preparation device and a preparation method thereof. Background Art

[0002] Ship exhaust emissions are a significant contributor to air pollution. Especially in port cities, these ships generate significant amounts of carbon dioxide, carbon monoxide, nitrogen oxides, and sulfur oxides, causing significant air pollution and harming the health of port residents. Ship nitrogen oxide emissions must also meet IMOTier III emission limits. Installing a diesel engine exhaust purification system (SCR) is an effective means of reducing emissions. Currently, this system requires urea as a reducing agent. Compared to automotive urea solutions, marine urea solutions require a higher concentration to reduce the volume of the urea tank. Therefore, a 40wt% urea solution is commonly used as the reducing agent.

[0003] There are still some deficiencies in the existing technology for preparing urea aqueous solution in ships:

[0004] 1. In the prior art, when preparing urea aqueous solution on board a ship, it is necessary to heat the solution in a preparation barrel using a heater to ensure that the fresh water and urea granules are mixed. However, when heated by the heater, the temperature of the urea aqueous solution near the heater is too high, which may cause instability of the aqueous solution or produce side reactions. In addition, when the heater is used to directly heat the water, the temperature of the heated water decreases due to subsequent flow, resulting in reduced urea dissolution efficiency.

[0005] 2. During the preparation process, urea particles are directly added into fresh water for preparation. Since the amount of urea added cannot be precisely controlled, the concentration of the prepared solution is not accurate enough.

[0006] In response to the above problems, the present invention document proposes a marine urea aqueous solution preparation device and a preparation method thereof. Summary of the Invention

[0007] The purpose of the present invention is to solve the shortcomings of the prior art, such as the instability of the aqueous solution or the generation of side reactions caused by heating with a heater, the decrease in temperature of the heated water due to subsequent flow, which leads to reduced urea dissolution efficiency, and inaccurate concentration of the prepared solution. A marine urea aqueous solution preparation device and preparation method are proposed.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A marine urea aqueous solution preparation device includes a water bath, a preparation barrel fixed to the bottom inner wall of the water bath via legs, and a gap between the water bath and the preparation barrel for holding fresh water for heating the preparation barrel. A top cover is fixed to the top of the preparation barrel via multiple bolts, and multiple heaters are fixed to the inner wall of the water bath, and the heaters are used to heat the fresh water in the gap between the water bath and the preparation barrel.

[0010] The stirring rod is rotatably connected to the bottom of the top cover and is used to stir and mix the urea granules in the preparation barrel with the fresh water. A drive motor is fixed to the top of the top cover by bolts, and the output shaft of the drive motor is fixedly connected to the top of the stirring rod through a coupling.

[0011] The water injection pipe is connected to an external fresh water storage device, one end of the water injection pipe is connected to a first pipe and a second pipe through a three-way angle valve, and the first pipe extends into the preparation barrel for providing fresh water to the preparation barrel, and one end of the second pipe extends into the water bath barrel for providing fresh water to the water bath barrel;

[0012] A concentration meter is provided on the outside of the water bath, and one end of the concentration meter passes through the water bath and extends into the preparation barrel, for real-time detection of the concentration of the urea aqueous solution in the preparation barrel;

[0013] Two sets of swing structures are respectively set on both sides of the bottom of the top cover, which are used to quickly mix the urea granules with fresh water when the urea granules are sprinkled into the preparation barrel;

[0014] The intermittent structure is arranged above the top cover and is used to intermittently sprinkle urea granules into the preparation barrel so that the concentration meter can accurately detect the concentration of the urea aqueous solution. The swing structure is located below the intermittent structure, and one of the swing structures can provide power for the intermittent structure.

[0015] In a possible design, the swing structure includes a base fixed to the bottom of the top cover by bolts, a rotating shaft is rotatably connected in the base, a swing frame is fixedly sleeved on the outer wall of the rotating shaft, a spreading pipe is fixedly passed through the swing frame, and the swing frame drives the spreading pipe to swing back and forth to spread urea granules into different positions in the preparation barrel, so that the urea granules are quickly mixed with fresh water, one end of the swing frame extends to the outside of the base, the outer wall of the rotating shaft is provided with a plurality of arc grooves, the outer wall of the rotating shaft is sleeved with a moving block, and a plurality of guide balls are fixed in the moving block. , and the guide ball cooperates with the arc groove. A plurality of guide rods are fixed to the side of the base close to the stirring rod by bolts, and one end of the plurality of guide rods slides through the moving block, and the moving block is limited by the guide rod; the moving block moves back and forth laterally along the guide rod. Under the cooperation of the guide ball and the arc groove, the moving block can drive the rotating shaft and the swing frame to swing back and forth, and then the material guide hose can sprinkle urea granules in the base through the spreading pipe, and the stirring rod stirs the fresh water in the preparation barrel, and the sprinkled urea granules can be quickly mixed with the rotating fresh water, thereby improving the preparation efficiency of urea aqueous solution.

[0016] In a possible design, the swing structure also includes a reciprocating threaded section arranged on the outer wall of the stirring rod, the stirring rod is threadedly connected to a nut block through the reciprocating threaded section, and a plurality of fixed rods are welded to the bottom of the top cover, and the bottom ends of the plurality of fixed rods slide through the nut block and are fixed with the same retaining ring, and the retaining ring is sleeved on the outer wall of the stirring rod, and both sides of the nut block are rotatably connected with connecting rods, and the bottom ends of the two connecting rods are respectively rotatably connected to the top of the corresponding moving block; when the stirring rod rotates, the nut block moves back and forth on the fixed rod through the cooperation of the nut block and the reciprocating threaded section, and the nut block drives the moving block to move back and forth laterally along the guide rod through the connecting rod, thereby sprinkling urea granules in the preparation barrel.

[0017] In one possible design, the intermittent structure includes a discharge cylinder arranged above the top cover, the top of the discharge cylinder is connected to the storage bin for storing urea granules in the ship through a feed pipe, the outer wall of the discharge cylinder is fixed to the top of the top cover by a plurality of supporting legs, the bottom of the discharge cylinder is provided with a plurality of discharge holes, the bottom of the discharge cylinder is rotatably connected to a rotating cylinder, the top of the rotating cylinder is provided with a plurality of feed holes, and the feed holes cooperate with the discharge holes, the outer wall of the rotating cylinder is rotatably sleeved with a fixed cover, and the fixed cover is connected to the rotating cylinder, the outer wall of the fixed cover is welded with a plurality of L-shaped frames, and the top end of the L-shaped frame is fixedly connected to the bottom of the discharge cylinder, and two material guiding hoses are provided at the bottom of the fixed cover, the bottom end of the material guiding hose extends into the preparation barrel and is connected to the material sprinkling pipe; when the rotating barrel rotates and the discharge hole corresponds to the feed hole, the urea granules in the discharge cylinder can be sprinkled into the preparation barrel through the material guiding hose and the material guiding hose, so that urea granules can be intermittently and gradually sprinkled into the preparation barrel, which can improve the accuracy of the concentration of the prepared solution.

[0018] In one possible design, the intermittent structure also includes a fixed ring fixedly mounted on the outer wall of the rotating cylinder, the outer wall of the rotating cylinder is provided with a torsion spring fixedly connected to the bottom end of the discharge cylinder, the bottom end of the torsion spring is fixedly connected to the top of the fixed ring, and a pull rope is wrapped around the outer wall of the rotating cylinder, the bottom end of the pull rope extends into the preparation barrel and is fixedly connected to the outer wall of one of the rotating shafts; when the rotating shaft swings, the rotating shaft pulls the rotating cylinder to rotate through the pull rope, and the torsion spring is in a stored force state. When the rotating shaft rotates in the opposite direction, the torsion spring can drive the rotating cylinder to reset and rotate, and then can drive the rotating cylinder to rotate when the swinging structure is running, thereby completing the intermittent discharge operation.

[0019] In one possible design, one side of one of the support legs is rotatably connected to a guide wheel through a base plate, and the guide wheel is used to guide the pull rope. A closed ring is fixed to the inner wall of the water bath, and the inner wall of the closed ring is fixedly connected to the outer wall of the preparation bucket. The inner wall of the water bath is provided with an insulation layer, and the insulation layer and the closed ring are both made of polyurethane rigid foam plastic. The closed ring is used to seal the fresh water between the water bath and the preparation bucket to prevent heat from escaping from above when heating the fresh water.

[0020] In a possible design, a drain pipe for discharging the aqueous solution is provided at the bottom of the preparation barrel, and one end of the drain pipe extends to the outside of the water bath barrel, and the outer walls of the drain pipe, the first pipe and the second pipe are all provided with valves, and the bottom of the preparation barrel is rotatably connected to a stirring blade, and the stirring blade is sleeved on the outer wall of the drain pipe, and the top two sides of the stirring blade are fixed with a second magnet by bolts, and the bottom end of the stirring rod is welded with a plurality of diagonal support rods, and the bottom end of the diagonal support rod is slidably connected to the bottom inner wall of the preparation barrel, and the diagonal support rod is used to The support is provided, and the bottom ends of the plurality of inclined support rods are fixedly embedded with a first magnet, and a magnetic attraction force is generated between the first magnet and the second magnet; when the driving motor drives the stirring rod to rotate to accelerate the mixing of urea particles and fresh water, the stirring rod drives the stirring blade to rotate through the inclined support rod, and a magnetic attraction force is generated between the first magnet and the second magnet, and the inclined support rod drives the stirring blade to rotate, and the stirring blade stirs the warm water in the water bath barrel, so that the warm water in the water bath barrel can be evenly distributed, and then the warm water can evenly heat the preparation barrel, thereby preventing the uneven heating of the preparation barrel from affecting the preparation of the urea aqueous solution.

[0021] The cam is fixedly mounted on the outside of the mixing rod and the mixing rod is fixed with a toothed plate, and the toothed plate is fixed with a toothed plate on the outside of the mixing rod. The cam is fixedly mounted on the outside of the mixing rod and the mixing rod is fixed with a toothed plate on the inside of the mixing rod. The cam is fixedly mounted on the outside of the mixing rod and the mixing rod is fixed with a toothed plate on the inside of the mixing rod.

[0022] In one possible design, a placement ring is fixed to the bottom of the retaining ring through a connecting column, a plurality of tooth assemblies are provided at the bottom of the placement ring, and the tooth assembly is composed of a plurality of teeth, one end of the rotating shaft rotates and extends to one side of the stirring rod and is fixed with a bevel gear, and the bevel gear cooperates with the teeth; when the stirring rod rotates, the stirring rod drives the bevel gear to rotate through the rotating shaft, and the cooperation between the bevel gear and the tooth assembly can intermittently drive the first sprocket to rotate, and the cooperation between the first sprocket, the chain and the push plate can drive the two push plates to move up and down alternately, thereby exchanging the upper and lower layers of aqueous solution.

[0023] In the present application, a method for preparing a marine urea aqueous solution preparation device comprises the following steps:

[0024] S1. Open the valves on the first pipe and the second pipe, connect the water injection pipe to the external fresh water storage device, inject fresh water into the water bath and the preparation barrel respectively through the water injection pipe, heat the fresh water in the water bath by the heater, and then the warm water in the water bath can heat the preparation barrel, which is convenient for the later preparation of urea aqueous solution; in addition, when the driving motor drives the stirring rod to rotate to accelerate the mixing of urea granules and fresh water, the stirring rod drives the stirring blade to rotate through the inclined support rod, and a magnetic attraction is generated between the first magnet and the second magnet, and the inclined support rod drives the stirring blade to rotate, and the stirring blade stirs the warm water in the water bath, so that the warm water in the water bath can be evenly distributed, and then the warm water can evenly heat the preparation barrel, thereby preventing the uneven heating of the preparation barrel from affecting the preparation of urea aqueous solution;

[0025] S2. When the stirring rod rotates, the nut block moves back and forth on the fixed rod through the cooperation of the nut block and the reciprocating threaded section. The nut block drives the moving block to move back and forth laterally along the guide rod through the connecting rod. Under the cooperation of the guide ball and the arc groove, the moving block can drive the rotating shaft and the swing frame to swing back and forth, and then the material guide hose can sprinkle urea granules into the base through the spreading pipe. The stirring rod stirs the fresh water in the preparation barrel, and the sprinkled urea granules can be quickly mixed with the fresh water, thereby improving the preparation efficiency of urea aqueous solution;

[0026] S3. When one of the rotating shafts swings back and forth, the rotating shaft can drive the rotating drum to rotate back and forth through the cooperation of the pull rope and the torsion spring. Through the cooperation of the feed hole and the discharge hole, the urea granules in the discharge drum can be intermittently discharged into the preparation barrel through the fixed cover and the guide hose. The urea granules are gradually added, and the concentration meter monitors the urea concentration in the preparation barrel in real time, thereby improving the accuracy of the prepared solution concentration;

[0027] S4. In addition, when the stirring rod rotates, the stirring rod drives the bevel gear to rotate through the rotating shaft. The bevel gear cooperates with the tooth assembly to intermittently drive the first sprocket to rotate. The cooperation of the first sprocket, the chain and the push plate can drive the two push plates to move up and down alternately. The two push plates can exchange the upper and lower layers of aqueous solution, thereby enabling the fresh water and urea particles in the preparation barrel to be fully and evenly mixed, ensuring that the concentration meter can accurately detect the accuracy of the urea aqueous solution in the preparation barrel at a fixed position.

[0028] In the present invention, a spreading pipe is fixed to the outer wall of the rotating shaft through a swing frame, the outer wall of the rotating shaft is provided with a plurality of arc-shaped grooves, the outer wall of the rotating shaft is sleeved with a moving block, a plurality of guide balls are fixed in the moving block, and the guide balls cooperate with the arc-shaped grooves; the moving block moves back and forth laterally along the guide rod, and under the cooperation of the guide balls and the arc-shaped grooves, the moving block can drive the rotating shaft and the swing frame to swing back and forth, and then the material guide hose can sprinkle urea granules into the base through the spreading pipe, and the stirring rod stirs the fresh water in the preparation barrel, so that the scattered urea granules can be quickly mixed with the fresh water, thereby improving the preparation efficiency of the urea aqueous solution;

[0029] In the present invention, a torsion spring is sleeved on the outer wall of the rotating cylinder and is fixedly connected to the bottom end of the discharge cylinder. The bottom end of the torsion spring is fixedly connected to the top of the fixed ring. A pull rope is wound around the outer wall of the rotating cylinder. The bottom end of the pull rope is fixedly connected to the outer wall of one of the rotating shafts. When the rotating shaft swings, the rotating shaft pulls the rotating cylinder to rotate through the pull rope, and the torsion spring is in a force storage state. When the rotating shaft rotates in the opposite direction, the torsion spring can drive the rotating cylinder to return to its original position and rotate, thereby driving the rotating cylinder to rotate when the swinging structure is in operation, thereby completing the intermittent discharge operation.

[0030] In the present invention, the stirring rod is threadedly connected to a nut block through a reciprocating threaded section, the nut block and the moving block are rotatably connected by a connecting rod, the bottom of the preparation barrel is rotatably connected to a stirring blade, the top two sides of the stirring blade are fixed with second magnets, the bottom ends of multiple diagonal support rods are fixedly embedded with first magnets, and magnetic attraction is generated between the first magnet and the second magnet; during the stirring process, the stirring rod can not only drive the operation of the swing structure through the up and down reciprocating movement of the nut block, but also drive the stirring blade to rotate, so that the warm water in the water bath barrel evenly heats the preparation barrel.

[0031] In the present invention, the urea aqueous solution is stirred by a stirring rod, which can sequentially drive a swing structure and an intermittent structure, so that urea granules are intermittently sprinkled into the preparation barrel in small batches. This not only allows the urea granules to be quickly mixed with fresh water, but also improves the accuracy of the prepared solution concentration. In addition, the preparation barrel is evenly heated by the warm water in the water bath and the preparation barrel, avoiding the loss of urea caused by directly using a heater with an excessively high heating temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic diagram of the three-dimensional structure of a marine urea aqueous solution preparation device provided in Example 1 of the present invention;

[0033] FIG2 is a schematic three-dimensional cross-sectional view of a marine urea aqueous solution preparation device provided in Example 1 of the present invention;

[0034] FIG3 is a schematic diagram of a three-dimensional exploded structure of a diagonal support rod, a first magnet, and a stirring blade of a marine urea aqueous solution preparation device provided in Example 1 of the present invention;

[0035] FIG4 is a schematic diagram of a three-dimensional structure of a swaying structure and an intermittent structure of a marine urea aqueous solution preparation device provided in Example 1 of the present invention;

[0036] FIG5 is a schematic diagram of a three-dimensional exploded structure of a rotating shaft, a moving block, and a stirring rod of a marine urea aqueous solution preparation device provided in Example 1 of the present invention;

[0037] FIG6 is a schematic diagram of a three-dimensional exploded cross-sectional structure of a rotating drum, a fixed cover, and a material guiding hose of a marine urea aqueous solution preparation device provided in Example 1 of the present invention;

[0038] FIG7 is a schematic diagram of a three-dimensional exploded structure of a fixed ring, a rotating drum, and a fixed cover of a marine urea aqueous solution preparation device provided in Example 1 of the present invention;

[0039] FIG8 is a schematic diagram of the three-dimensional structure of a push plate and a stirring rod of a marine urea aqueous solution preparation device provided in Example 2 of the present invention;

[0040] FIG9 is a schematic diagram of a three-dimensional exploded structure of a placement ring, a bevel gear, and a load-bearing ring of a marine urea aqueous solution preparation device provided in Example 2 of the present invention;

[0041] FIG10 is a schematic diagram of a three-dimensional exploded structure of a placement ring and a bevel gear of a marine urea aqueous solution preparation device provided in Example 2 of the present invention.

[0042] In the figure: 1, water bath; 2, preparation barrel; 3, stirring rod; 4, driving motor; 5, diagonal support rod; 6, top cover; 7, water injection pipe; 8, first pipe; 9, second pipe; 10, concentration meter; 11, heater; 12, drain pipe; 13, stirring blade; 14, first magnet; 15, second magnet; 16, reciprocating thread section; 17, nut block; 18, fixed rod; 19, retaining ring; 20, base; 21, rotating shaft; 22, swing frame; 23, spreading pipe; 24, moving block; 25, connecting rod; 26, guide Rod; 27. Arc groove; 28. Guide ball; 29. ​​Discharge barrel; 30. Support leg; 31. Discharge hole; 32. Rotating barrel; 33. Feed hole; 34. L-shaped frame; 35. Fixed cover; 36. Guide hose; 37. Fixed ring; 38. Torsion spring; 39. Pull rope; 40. Guide wheel; 41. Rotating shaft; 42. First sprocket; 43. Loading ring; 44. Second sprocket; 45. Chain; 46. Push plate; 47. Load-bearing block; 48. Placement ring; 49. Tooth assembly; 50. Bevel gear; 51. Closed ring. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Example

[0044] 1 to 7 , a marine urea aqueous solution preparation device, which is used in the field of urea aqueous solution production equipment, includes a water bath 1, a preparation barrel 2 is fixed to the bottom inner wall of the water bath 1 via legs, and the gap between the water bath 1 and the preparation barrel 2 is used to hold fresh water for heating the preparation barrel 2. A top cover 6 is fixed to the top of the preparation barrel 2 via multiple bolts. Multiple heaters 11 are fixed to the inner wall of the water bath 1, and the heaters 11 are used to heat the fresh water in the gap between the water bath 1 and the preparation barrel 2.

[0045] The stirring rod 3 is rotatably connected to the bottom of the top cover 6 and is used to stir and mix the urea granules in the preparation barrel 2 with the fresh water. The top of the top cover 6 is fixed with a drive motor 4 by bolts, and the output shaft of the drive motor 4 is fixedly connected to the top of the stirring rod 3 through a coupling.

[0046] It includes a water injection pipe 7, which is connected to an external fresh water storage device. One end of the water injection pipe 7 is connected to a first pipe 8 and a second pipe 9 through a three-way angle valve. The first pipe 8 extends into the preparation barrel 2 to provide fresh water to the inside of the preparation barrel 2. One end of the second pipe 9 extends into the water bath barrel 1 to provide fresh water to the inside of the water bath barrel 1.

[0047] The concentration meter 10 is arranged on the outside of the water bath 1, and one end of the concentration meter 10 passes through the water bath 1 and extends into the preparation barrel 2, for real-time detection of the concentration of the urea aqueous solution in the preparation barrel 2.

[0048] 2 and 3 , a drain pipe 12 for discharging the aqueous solution is provided at the bottom of the preparation barrel 2, and one end of the drain pipe 12 extends to the outside of the water bath barrel 1, and valves are provided on the outer walls of the drain pipe 12, the first pipe 8, and the second pipe 9. A stirring blade 13 is rotatably connected to the bottom of the preparation barrel 2, and the stirring blade 13 is sleeved on the outer wall of the drain pipe 12. A second magnet 15 is fixed to both sides of the top of the stirring blade 13 by bolts. A plurality of diagonal support rods 5 are welded to the bottom end of the stirring rod 3, and the bottom end of the diagonal support rod 5 is slidably connected to the bottom inner wall of the preparation barrel 2. The diagonal support rod 5 is used to support the stirring rod 3. The bottom ends of the inclined support rods 5 are fixedly embedded with the first magnet 14, and a magnetic attraction force is generated between the first magnet 14 and the second magnet 15; when the driving motor 4 drives the stirring rod 3 to rotate and accelerates the mixing of urea granules and fresh water, the stirring rod 3 drives the stirring blade 13 to rotate through the inclined support rods 5, and a magnetic attraction force is generated between the first magnet 14 and the second magnet 15, and the inclined support rods 5 drive the stirring blade 13 to rotate, and the stirring blade 13 stirs the warm water in the water bath 1, so that the warm water in the water bath 1 can be evenly distributed, and then the warm water can evenly heat the preparation barrel 2, thereby preventing the uneven heating of the preparation barrel 2 from affecting the preparation of the urea aqueous solution.

[0049] 2 , 4 and 5 , the device further comprises two sets of swing structures arranged on both sides of the bottom of the top cover 6, which are used to quickly mix the urea granules with fresh water when the urea granules are sprinkled into the preparation barrel 2; the swing structure comprises a base 20 fixed to the bottom of the top cover 6 by bolts, a rotating shaft 21 is rotatably connected in the base 20, a swing frame 22 is fixedly sleeved on the outer wall of the rotating shaft 21, a spreading pipe 23 is fixedly passed through the swing frame 22, and the swing frame 22 drives the spreading pipe 23 to swing back and forth, so as to sprinkle the urea granules into different positions in the preparation barrel 2, so that the urea granules are quickly mixed with fresh water, one end of the swing frame 22 extends to the outside of the base 20, the outer wall of the rotating shaft 21 is provided with a plurality of arc grooves 27, and the outer wall of the rotating shaft 21 is sleeved with a moving block 24. A plurality of guide balls 28 are fixed in the moving block 24, and the guide balls 28 cooperate with the arc groove 27. A plurality of guide rods 26 are fixed to the side of the base 20 close to the stirring rod 3 by bolts, and one end of the plurality of guide rods 26 slides through the moving block 24, and the moving block 24 is limited by the guide rods 26; the moving block 24 moves back and forth laterally along the guide rods 26. With the cooperation of the guide balls 28 and the arc groove 27, the moving block 24 can drive the rotating shaft 21 and the swing frame 22 to swing back and forth, and then the material guide hose 36 can sprinkle the urea granules in the base 20 through the spreading pipe 23, and the stirring rod 3 stirs the fresh water in the preparation barrel 2, and the scattered urea granules can be quickly mixed with the rotating fresh water, thereby improving the preparation efficiency of the urea aqueous solution.

[0050] 5 , the swinging structure also includes a reciprocating threaded section 16 provided on the outer wall of the stirring rod 3. The stirring rod 3 is threadedly connected to a nut block 17 through the reciprocating threaded section 16. A plurality of fixed rods 18 are welded to the bottom of the top cover 6. The bottom ends of the plurality of fixed rods 18 all slide through the nut block 17 and are fixed with the same retaining ring 19. The retaining ring 19 is sleeved on the outer wall of the stirring rod 3. Both sides of the nut block 17 are rotatably connected to connecting rods 25. The bottom ends of the two connecting rods 25 are respectively rotatably connected to the tops of the corresponding moving blocks 24. When the stirring rod 3 rotates, the nut block 17 moves back and forth on the fixed rod 18 through the cooperation of the nut block 17 and the reciprocating threaded section 16. The nut block 17 drives the moving block 24 to move back and forth laterally along the guide rod 26 through the connecting rod 25, thereby sprinkling the urea granules in the preparation barrel 2.

[0051] 2, 4 and 6, the device further comprises an intermittent structure provided above the top cover 6, for intermittently sprinkling urea granules into the preparation barrel 2, so that the concentration meter 10 can accurately detect the concentration of the urea aqueous solution, and the swing structure is located below the intermittent structure, one of the swing structures can provide power for the intermittent structure; the intermittent structure comprises a discharge cylinder 29 provided above the top cover 6, the top of the discharge cylinder 29 is connected to the storage bin for storing urea granules in the ship through a feed pipe, the outer wall of the discharge cylinder 29 is fixed to the top of the top cover 6 by a plurality of supporting legs 30, the bottom of the discharge cylinder 29 is provided with a plurality of discharge holes 31, the bottom of the discharge cylinder 29 is rotatably connected to a rotating cylinder 32, and the top of the rotating cylinder 32 is provided with a plurality of feed holes 33 , and the feed hole 33 matches the discharge hole 31, the outer wall of the rotating cylinder 32 is rotatably sleeved with a fixed cover 35, and the fixed cover 35 is connected to the rotating cylinder 32, and a plurality of L-shaped frames 34 are welded to the outer wall of the fixed cover 35, and the top of the L-shaped frame 34 is fixedly connected to the bottom of the discharge cylinder 29, and two material guiding hoses 36 are provided at the bottom of the fixed cover 35, and the bottom end of the material guiding hose 36 extends into the preparation barrel 2 and is connected to the material spreading pipe 23; when the rotating cylinder 32 rotates and the discharge hole 31 corresponds to the feed hole 33, the urea granules in the discharge barrel 29 can be sprinkled into the preparation barrel 2 through the material guiding hose 36 and the material guiding hose 36, so that urea granules can be intermittently and gradually sprinkled into the preparation barrel 2, which can improve the accuracy of the concentration of the prepared solution.

[0052] 6 and 7 , the intermittent structure also includes a fixed ring 37 fixedly mounted on the outer wall of the rotating cylinder 32. The outer wall of the rotating cylinder 32 is provided with a torsion spring 38 fixedly connected to the bottom end of the discharge cylinder 29. The bottom end of the torsion spring 38 is fixedly connected to the top of the fixed ring 37. A pull rope 39 is wrapped around the outer wall of the rotating cylinder 32. The bottom end of the pull rope 39 extends into the preparation barrel 2 and is fixedly connected to the outer wall of one of the rotating shafts 21. When the rotating shaft 21 swings, the rotating shaft 21 pulls the rotating cylinder 32 to rotate through the pull rope 39, and the torsion spring 38 is in a power storage state. When the rotating shaft 21 rotates in the opposite direction, the torsion spring 38 can drive the rotating cylinder 32 to reset and rotate, and then drive the rotating cylinder 32 to rotate when the swinging structure is running, thereby completing the intermittent discharging operation.

[0053] 2 , 4 and 6 , one side of one of the supporting legs 30 is rotatably connected to a guide wheel 40 through a base plate, and the guide wheel 40 is used to guide the pull rope 39 . A closed ring 51 is fixed to the inner wall of the water bath 1 , and the inner wall of the closed ring 51 is fixedly connected to the outer wall of the preparation barrel 2 . The inner wall of the water bath 1 is provided with an insulation layer, and the insulation layer and the closed ring 51 are both made of polyurethane rigid foam plastics. The closed ring 51 is used to seal the fresh water between the water bath 1 and the preparation barrel 2 to prevent heat from escaping from above when the fresh water is heated. Example

[0054] Referring to Figures 8 to 10, an improvement is made on the basis of Example 1: a rotating shaft 41 is rotatably connected to the stirring rod 3 through a cavity, a first sprocket 42 is provided on the outer wall fixed sleeve of the rotating shaft 41, a carrying ring 43 is provided on the outer wall fixed sleeve of the stirring rod 3, and a second sprocket 44 is rotatably connected to the top of the carrying ring 43 on both sides through a base plate, and the first sprocket 42 and the two second sprockets 44 are connected by a chain 45 for transmission, and push plates 46 are slidably connected to both sides of the stirring rod 3 through slide rails and slide grooves, and the two ends of the chain 45 are fixedly connected to the tops of the two push plates 46 respectively, and the bottom of one of the push plates 46 is fixed by bolts. There is a load-bearing block 47; when the rotating shaft 41 drives the first sprocket 42 to rotate, the first sprocket 42 can drive the two push plates 46 to move up and down respectively through the chain 45, among which the push plate 46 above the load-bearing block 47 moves up. When the rotating shaft 41 loses the driving force, the gravity of the load-bearing block 47 drives the corresponding push plate 46 to move down, and then the two push plates 46 alternately move up and down, so that the upper and lower layers of the aqueous solution can be exchanged, and the fresh water and urea particles in the preparation barrel 2 can be fully and evenly mixed, ensuring that the concentration meter 10 can accurately detect the accuracy of the concentration of the urea aqueous solution in the preparation barrel 2 at a fixed position.

[0055] 8-10, a placement ring 48 is fixed to the bottom of the retaining ring 19 through a connecting column, and a plurality of tooth assemblies 49 are provided at the bottom of the placement ring 48, and the tooth assembly 49 is composed of a plurality of teeth. One end of the rotating shaft 41 rotates and extends to one side of the stirring rod 3 and is fixed with a bevel gear 50, and the bevel gear 50 cooperates with the teeth; when the stirring rod 3 rotates, the stirring rod 3 drives the bevel gear 50 to rotate through the rotating shaft 41, and the bevel gear 50 cooperates with the tooth assembly 49 to intermittently drive the first sprocket 42 to rotate, and the cooperation of the first sprocket 42 with the chain 45 and the push plate 46 can drive the two push plates 46 to move up and down alternately, thereby exchanging the upper and lower layers of the aqueous solution.

[0056] A method for preparing a marine urea aqueous solution preparation device comprises the following steps:

[0057] S1. Open the valves on the first pipe 8 and the second pipe 9, connect the water injection pipe 7 to the external fresh water storage device, and inject fresh water into the water bath 1 and the preparation barrel 2 respectively through the water injection pipe 7. The fresh water in the water bath 1 is heated by the heater 11, and then the warm water in the water bath 1 can heat the preparation barrel 2, which is convenient for the later preparation of urea aqueous solution; in addition, when the driving motor 4 drives the stirring rod 3 to rotate and accelerates the mixing of urea granules and fresh water, the stirring rod 3 drives the stirring blade 13 to rotate through the inclined support rod 5, and a magnetic attraction is generated between the first magnet 14 and the second magnet 15, and the inclined support rod 5 drives the stirring blade 13 to rotate. The stirring blade 13 stirs the warm water in the water bath 1, so that the warm water in the water bath 1 can be evenly distributed, and then the warm water can evenly heat the preparation barrel 2, thereby preventing the uneven heating of the preparation barrel 2 from affecting the preparation of the urea aqueous solution;

[0058] S2. When the stirring rod 3 rotates, the nut block 17 moves back and forth on the fixed rod 18 through the cooperation of the nut block 17 and the reciprocating threaded section 16. The nut block 17 drives the moving block 24 to move back and forth laterally along the guide rod 26 through the connecting rod 25. Under the cooperation of the guide ball 28 and the arc groove 27, the moving block 24 can drive the rotating shaft 21 and the swing frame 22 to swing back and forth, and then the material guide hose 36 can sprinkle urea granules into the base 20 through the spreading pipe 23, and the stirring rod 3 stirs the fresh water in the preparation barrel 2. The scattered urea granules can be quickly mixed with the fresh water, thereby improving the preparation efficiency of the urea aqueous solution;

[0059] S3. When one of the rotating shafts 21 swings back and forth, the rotating shaft 21 can drive the rotating cylinder 32 to rotate back and forth through the cooperation of the pull rope 39 and the torsion spring 38. The urea granules in the discharge cylinder 29 can be intermittently discharged into the preparation barrel 2 through the fixed cover 35 and the material guide hose 36 through the cooperation of the feed hole 33 and the discharge hole 31. Urea granules are gradually added, and the concentration meter 10 monitors the urea concentration in the preparation barrel 2 in real time, thereby improving the accuracy of the prepared solution concentration.

[0060] S4. In addition, when the stirring rod 3 rotates, the stirring rod 3 drives the bevel gear 50 to rotate through the rotating shaft 41. The bevel gear 50 cooperates with the tooth assembly 49 to intermittently drive the first sprocket 42 to rotate. The cooperation of the first sprocket 42, the chain 45 and the push plate 46 can drive the two push plates 46 to move up and down alternately. The two push plates 46 can exchange the upper and lower layers of aqueous solution, thereby enabling the fresh water and urea particles in the preparation barrel 2 to be fully and evenly mixed, ensuring that the concentration meter 10 can accurately detect the accuracy of the urea aqueous solution in the preparation barrel 2 at a fixed position.

[0061] However, as is well known to those skilled in the art, the working principles and wiring methods of the drive motor 4 and the heater 11 are commonplace, and are conventional means or common knowledge, so they will not be elaborated here. Those skilled in the art can make any selections according to their needs or convenience.

[0062] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A marine urea aqueous solution preparation device, characterized in that: The invention comprises a water bath barrel (1), wherein a preparation barrel (2) is fixed to the inner wall of the bottom of the water bath barrel (1) via supporting legs, and a gap between the water bath barrel (1) and the preparation barrel (2) is used to hold fresh water for heating the preparation barrel (2), a top cover (6) is fixed to the top of the preparation barrel (2) via multiple bolts, and multiple heaters (11) are fixed to the inner wall of the water bath barrel (1), and the heaters (11) are used to heat the fresh water in the gap between the water bath barrel (1) and the preparation barrel (2); The stirring rod (3) is rotatably connected to the bottom of the top cover (6) and is used to stir and mix the urea granules in the preparation barrel (2) with fresh water. The top of the top cover (6) is fixed with a drive motor (4) by bolts, and the output shaft of the drive motor (4) is fixedly connected to the top of the stirring rod (3) by a coupling. The invention comprises a water injection pipe (7), and the water injection pipe (7) is connected to an external fresh water storage device, one end of the water injection pipe (7) is connected to a first pipe (8) and a second pipe (9) through a three-way angle valve, and the first pipe (8) extends into the preparation barrel (2) for providing fresh water to the inside of the preparation barrel (2), and one end of the second pipe (9) extends into the water bath barrel (1) for providing fresh water to the inside of the water bath barrel (1); A concentration meter (10), the concentration meter (10) being arranged outside the water bath (1), and one end of the concentration meter (10) passing through the water bath (1) and extending into the preparation barrel (2), for real-time detection of the concentration of the urea aqueous solution in the preparation barrel (2); Two sets of swing structures are respectively arranged on both sides of the bottom of the top cover (6) and are used to quickly mix the urea granules with the fresh water when the urea granules are sprinkled into the preparation barrel (2); The intermittent structure is arranged above the top cover (6) and is used to intermittently sprinkle urea granules into the preparation barrel (2) so that the concentration meter (10) can accurately detect the concentration of the urea aqueous solution, and the swing structure is located below the intermittent structure, and one of the swing structures can provide power for the intermittent structure.

2. The marine urea aqueous solution preparation equipment according to claim 1, characterized in that: The swing structure comprises a base (20) fixed to the bottom of the top cover (6) by bolts, a rotating shaft (21) is rotatably connected in the base (20), an outer wall of the rotating shaft (21) is fixedly sleeved with a swing frame (22), a spreading pipe (23) is fixedly passed through the swing frame (22), and the swing frame (22) drives the spreading pipe (23) to swing back and forth to spread urea granules into different positions in the preparation barrel (2), so that the urea granules are quickly mixed with fresh water, and one end of the swing frame (22) extends to the base ( 20), the outer wall of the rotating shaft (21) is provided with a plurality of arc grooves (27), the outer wall of the rotating shaft (21) is provided with a moving block (24), a plurality of guide balls (28) are fixed in the moving block (24), and the guide balls (28) are matched with the arc grooves (27), a plurality of guide rods (26) are fixed to the side of the base (20) close to the stirring rod (3) by bolts, and one end of the plurality of guide rods (26) slides through the moving block (24), and the moving block (24) is limited by the guide rods (26).

3. The marine urea aqueous solution preparation equipment according to claim 2, characterized in that: The swing structure further includes a reciprocating threaded section (16) provided on the outer wall of the stirring rod (3), the stirring rod (3) being threadedly connected to a nut block (17) via the reciprocating threaded section (16), a plurality of fixing rods (18) being welded to the bottom of the top cover (6), the bottom ends of the plurality of fixing rods (18) all slidingly pass through the nut block (17) and being fixed with a same retaining ring (19), and the retaining ring (19) being sleeved on the outer wall of the stirring rod (3), both sides of the nut block (17) being rotatably connected to connecting rods (25), the bottom ends of the two connecting rods (25) being rotatably connected to the tops of the corresponding moving blocks (24) respectively.

4. The marine urea aqueous solution preparation equipment according to claim 3, characterized in that: The intermittent structure comprises a discharge cylinder (29) arranged above the top cover (6), the top of the discharge cylinder (29) is connected to a storage bin for storing urea granules in the ship through a feed pipe, the outer wall of the discharge cylinder (29) is fixed to the top of the top cover (6) through a plurality of supporting legs (30), a plurality of discharge holes (31) are provided at the bottom of the discharge cylinder (29), a rotating cylinder (32) is rotatably connected to the bottom of the discharge cylinder (29), a plurality of feed holes (33) are provided at the top of the rotating cylinder (32), and the feed holes (33) cooperates with the discharge hole (31), the outer wall of the rotating cylinder (32) is provided with a fixed cover (35), and the fixed cover (35) is connected to the rotating cylinder (32), the outer wall of the fixed cover (35) is welded with a plurality of L-shaped frames (34), and the top of the L-shaped frame (34) is fixedly connected to the bottom of the discharge cylinder (29), and the bottom of the fixed cover (35) is provided with two material guide hoses (36), the bottom ends of the material guide hoses (36) extend into the preparation barrel (2) and are connected to the material spreading pipe (23).

5. The marine urea aqueous solution preparation equipment according to claim 4, characterized in that: The intermittent structure also includes a fixed ring (37) fixedly mounted on the outer wall of the rotating cylinder (32), the outer wall of the rotating cylinder (32) is provided with a torsion spring (38) fixedly connected to the bottom end of the discharge cylinder (29), the bottom end of the torsion spring (38) is fixedly connected to the top of the fixed ring (37), and a pull rope (39) is wound around the outer wall of the rotating cylinder (32), the bottom end of the pull rope (39) extends into the preparation barrel (2) and is fixedly connected to the outer wall of one of the rotating shafts (21).

6. The marine urea aqueous solution preparation equipment according to claim 5, characterized in that: One side of one of the support legs (30) is rotatably connected to a guide wheel (40) through a base plate, and the guide wheel (40) is used to guide the pull rope (39). A closed ring (51) is fixed to the inner wall of the water bath (1), and the inner wall of the closed ring (51) is fixedly connected to the outer wall of the preparation barrel (2). The inner wall of the water bath (1) is provided with an insulation layer, and the insulation layer and the closed ring (51) are both polyurethane rigid foam plastics. The closed ring (51) is used to seal the fresh water between the water bath (1) and the preparation barrel (2).

7. The marine urea aqueous solution preparation equipment according to claim 6, characterized in that: The bottom of the preparation barrel (2) is provided with a drain pipe (12) for discharging the aqueous solution, and one end of the drain pipe (12) extends to the outside of the water bath barrel (1), and the outer walls of the drain pipe (12), the first pipe (8) and the second pipe (9) are all provided with valves. The bottom of the preparation barrel (2) is rotatably connected to a stirring blade (13), and the stirring blade (13) is sleeved on the outer wall of the drain pipe (12). The top two sides of the stirring blade (13) are fixed with a second magnet (15) by bolts. The bottom end of the stirring rod (3) is welded with a plurality of inclined support rods (5), and the bottom end of the inclined support rod (5) is slidably connected to the inner wall of the bottom of the preparation barrel (2). The inclined support rod (5) is used to support the stirring rod (3), and the bottom ends of the plurality of inclined support rods (5) are fixedly embedded with a first magnet (14), and a magnetic attraction force is generated between the first magnet (14) and the second magnet (15).

8. The marine urea aqueous solution preparation equipment according to claim 7, characterized in that: The stirring rod (3) is rotatably connected to a rotating shaft (41) through a cavity, the outer wall fixed sleeve of the rotating shaft (41) is provided with a first sprocket (42), the outer wall fixed sleeve of the stirring rod (3) is provided with a bearing ring (43), the top two sides of the bearing ring (43) are rotatably connected to second sprockets (44) through a base plate, the first sprocket (42) and the two second sprockets (44) are connected by a chain (45), and both sides of the stirring rod (3) are slidably connected to push plates (46) through slide rails and slide grooves, the two ends of the chain (45) are respectively fixedly connected to the tops of the two push plates (46), and a load-bearing block (47) is fixed to the bottom of one of the push plates (46) by bolts.

9. The marine urea aqueous solution preparation equipment according to claim 8, characterized in that: A placement ring (48) is fixed to the bottom of the retaining ring (19) via a connecting column. A plurality of tooth assemblies (49) are provided at the bottom of the placement ring (48), and the tooth assemblies (49) are composed of a plurality of teeth. One end of the rotating shaft (41) rotates and extends to one side of the stirring rod (3) and is fixed with a bevel gear (50), and the bevel gear (50) cooperates with the teeth.

10. The method for preparing a marine urea aqueous solution preparation device according to claim 9, characterized in that: The following steps are involved: S1. Open the valves on the first pipe (8) and the second pipe (9), connect the water injection pipe (7) to the external fresh water storage device, inject fresh water into the water bath (1) and the preparation barrel (2) respectively through the water injection pipe (7), heat the fresh water in the water bath (1) through the heater (11), and then the warm water in the water bath (1) can heat the preparation barrel (2), which is convenient for the later preparation of the urea aqueous solution; in addition, when the driving motor (4) drives the stirring rod (3) to rotate and accelerates the mixing of urea particles and fresh water, the stirring rod (3) drives the stirring blade (13) to rotate through the inclined support rod (5), and a magnetic attraction is generated between the first magnet (14) and the second magnet (15), and the inclined support rod (5) drives the stirring blade (13) to rotate, and the stirring blade (13) stirs the warm water in the water bath (1) so that the warm water in the water bath (1) can be evenly distributed; S2. When the stirring rod (3) rotates, the nut block (17) moves back and forth on the fixed rod (18) through the cooperation of the nut block (17) and the reciprocating threaded section (16). The nut block (17) drives the moving block (24) to move back and forth laterally along the guide rod (26) through the connecting rod (25). Under the cooperation of the guide ball (28) and the arc groove (27), the moving block (24) can drive the rotating shaft (21) and the swing frame (22) to swing back and forth, and then the material guide hose (36) can sprinkle urea granules into the base (20) through the spreading pipe (23), and the stirring rod (3) stirs the fresh water in the preparation barrel (2), and the sprinkled urea granules can be quickly mixed with the fresh water; S3. When one of the rotating shafts (21) swings back and forth, the rotating shaft (21) can drive the rotating drum (32) to rotate back and forth through the cooperation of the pull rope (39) and the torsion spring (38). Through the cooperation of the feed hole (33) and the discharge hole (31), the urea granules in the discharge drum (29) can be intermittently discharged into the preparation barrel (2) through the fixed cover (35) and the guide hose (36), and the urea granules are gradually added. The concentration meter (10) monitors the urea concentration in the preparation barrel (2) in real time. S4. In addition, when the stirring rod (3) rotates, the stirring rod (3) drives the bevel gear (50) to rotate through the rotating shaft (41). The bevel gear (50) cooperates with the tooth assembly (49) to intermittently drive the first sprocket (42) to rotate. The first sprocket (42) cooperates with the chain (45) and the push plate (46) to drive the two push plates (46) to move up and down alternately. The two push plates (46) can exchange the upper and lower layers of the aqueous solution, thereby enabling the fresh water in the preparation barrel (2) and the urea granules to be fully and evenly mixed.

Images