A feeding device for urea hydrolysis reactor

Abstract

The present invention relates to the technical field of hydrolysis reactors, and in particular to a feeding device for a urea hydrolysis reactor; the device comprises a body, an air outlet is provided at the upper end of the body; an air inlet is provided at the lower end of the body; a stirring rod is rotatably connected to the interior of the body; and a driving motor is fixedly installed at the upper end of the body. The present invention enables the coordinated rotation of a conversion plate and an annular plate so that two groups of communicating holes on the surface of the conversion plate are respectively connected to the annular plate, thereby controlling the manner in which urea solution enters the body. That is, in the initial stage of the reaction, the annular plate is controlled to push the urea solution into the body from the infusion port above, so that a large flow of urea solution can quickly flow into the body, shortening the feeding time and improving the efficiency of the urea hydrolysis reaction. Similarly, controlling the urea solution located at the annular plate to flow from the infusion trough below to the nozzle for spray feeding helps to improve the uniformity of urea distribution in the body, thereby improving the overall stability and overall reaction efficiency of the urea hydrolysis reaction.

Description

Technical Field

[0001] The invention relates to the technical field of hydrolysis reactors, in particular to a feeding device for a urea hydrolysis reactor. Background Art

[0002] Urea hydrolysis is a crucial step in the urea production process, where urea is decomposed into ammonia and carbon dioxide under the action of water. Urea granules are first transported to a dissolution tank for dissolution. In this tank, demineralized water is used to convert the granules into a urea solution with a concentration of approximately 40%-60%. A steam coil heating system maintains the solution temperature between 50-70°C to ensure full dissolution of the urea. The dissolved urea solution is then pumped to a urea solution storage tank for storage. When the urea solution needs to be hydrolyzed, it is simply pumped to the urea hydrolysis reactor, where it undergoes a hydrolysis reaction at a constant temperature (140-160°C) to produce ammonia, carbon dioxide, and water vapor.

[0003] In the urea hydrolysis reaction process, the feed of urea solution is usually quantitatively delivered by a metering pump. There are two ways to deliver the urea solution into the hydrolysis reactor: one is direct injection through a pipeline valve, and the other is spraying it into the hydrolysis reactor by spraying. In comparison, spraying has a better distribution effect. During the spraying process, it can achieve uniform distribution of urea solution inside the hydrolysis reactor, improve the fluid flow state and temperature field distribution in the reactor, especially when processing high-concentration urea solution, it can effectively prevent the flow unevenness caused by the high viscosity of the solution, and improve the overall stability and efficiency of the reaction.

[0004] However, the spray feeding rate is relatively slow, which makes it difficult to meet the rapid replenishment of the large flow rate of urea solution required in the initial stage of the reaction. At the same time, when the temperature of the hydrolysis reactor is high or the concentration of the urea solution used is low, the spray method cannot quickly deliver enough solution to maintain the temperature and concentration conditions required for the reaction, which will affect the efficiency of the urea hydrolysis reaction and the system balance.

[0005] In view of this, in order to overcome the above technical problems, the present invention proposes a urea hydrolysis reactor feeding device to solve the above technical problems. Summary of the Invention

[0006] In order to overcome the deficiencies of the prior art, the present invention proposes a feeding device for a urea hydrolysis reactor. The present invention controls the manner in which the urea solution enters the reactor by cooperatively rotating a conversion plate and an annular plate so that two groups of communicating holes on the surface of the conversion plate are respectively connected to the annular plate. That is, in the initial stage of the reaction, the annular plate is controlled to push the urea solution into the reactor from the infusion port above, so that a large flow of urea solution can flow into the reactor quickly, shortening the feeding time and improving the efficiency of the urea hydrolysis reaction. Similarly, controlling the urea solution located at the annular plate to flow from the infusion trough below to the nozzle for spray feeding helps to improve the uniformity of urea distribution in the reactor, thereby improving the overall stability and overall reaction efficiency of the urea hydrolysis reaction.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a urea hydrolysis reactor feeding device according to the present invention comprises:

[0008] The machine body has an air outlet at its upper end and an air inlet at its lower end; a stirring rod is rotatably connected to the inside of the machine body; a driving motor is fixedly mounted on the upper end of the machine body; the driving motor is used to drive the stirring rod to rotate; a mounting bracket is mounted on the inner wall of the machine body; a nozzle is mounted on the lower end of the mounting bracket;

[0009] A metering box is fixedly connected to the surface of the body; an infusion port is provided on the surface of the body; the infusion port is connected to the metering box; a liquid inlet is provided at the bottom of the metering box; an annular plate is slidingly and sealedly connected inside the metering box; a screw is rotatably connected to the upper end of the annular plate; the screw is helically connected to the metering box; an infusion groove connected to the nozzle is provided inside the mounting frame; the end of the infusion groove away from the nozzle is connected to the metering box; a one-way pressure-stabilizing valve is installed in the infusion groove; the infusion port and the infusion groove are distributed up and down; a through groove is provided on the surface of the annular plate; a conversion unit is installed in the through groove; the conversion unit is used to adjust the flow direction of the through groove.

[0010] Preferably, the conversion unit includes a conversion plate; the conversion plate is rotatably sealed and connected to the lower end of the annular plate; a connecting hole is opened on the surface of the conversion plate; two groups of connecting holes are provided; one-way valves in opposite directions are installed in the two groups of connecting holes; a driving unit is installed inside the body; the driving unit is used to drive the conversion plate to rotate.

[0011] Preferably, the driving unit includes a spur gear; the spur gear is rotatably connected to the annular plate; a mounting groove is provided on the upper end surface of the conversion plate; the screw is fixedly connected to the upper end of the spur gear; a groove is provided on the inner wall of the mounting groove; a rack that meshes with the spur gear is slidingly sealed in the groove; the rack is connected to the bottom of the groove by a fixed spring; the shapes of the groove and the rack are both set to be arc-shaped.

[0012] Preferably, a cylindrical groove is provided at the upper end of the screw; an oil channel is provided inside the conversion plate; one end of the oil channel is connected to the groove, and the other end passes through the screw and is connected to the cylindrical groove; a sealing plug is provided in a sliding sealing connection in the cylindrical groove; and an electromagnetic sheet is embedded in the lower end surface of the sealing plug.

[0013] Preferably, the driving unit also includes a rotating drum; the rotating drum is rotatably connected to the metering box; the screw is slidably connected to the rotating drum; the rotating drum and the output shaft of the driving motor are connected by a transmission belt; a circular groove is provided on the surface of the output shaft of the driving motor; an insertion rod is connected in a sliding seal in the circular groove; the insertion rod is connected to the bottom of the circular groove by a supporting spring; an electromagnetic ring is inlaid on the bottom of the circular groove; and a slot matching the insertion rod is provided on the inner ring wall of the transmission belt.

[0014] Preferably, a bellows is provided in the metering box; the bellows is sleeved on the surface of the screw; the bellows is made of PTFE material; a baffle is connected to the sliding seal in the infusion port; the baffle is connected to the inner wall of the infusion port by a connecting spring.

[0015] Preferably, a resistance wire is embedded in the conversion plate.

[0016] Preferably, the lower end of the stirring rod is rotatably connected to the bottom of the body; a blade is fixedly connected to the surface of the stirring rod; an air hole is opened on the surface of the blade; an air channel is opened inside the stirring rod; one end of the air channel is connected to the air hole, and the other end is connected to the air inlet.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The present invention controls the way in which the urea solution enters the body by cooperating and rotating the conversion plate and the annular plate, so that the two groups of communication holes on the conversion plate surface are connected to the annular plate respectively. Specifically, in the initial stage of the reaction, the annular plate is controlled to push the urea solution into the body from the upper infusion port, allowing a large flow of urea solution to flow into the body quickly, shortening the feeding time and improving the efficiency of the urea hydrolysis reaction. Similarly, controlling the urea solution located at the annular plate to flow from the infusion trough below to the nozzle for spray feeding helps to improve the uniformity of urea distribution in the body, thereby improving the overall stability and overall reaction efficiency of the urea hydrolysis reaction.

[0019] 2. The present invention embeds a resistance wire inside the conversion plate, so that the resistance wire can heat the conversion plate, and the heated conversion plate can transfer heat to the one-way valve, thereby heating the high-concentration urea flowing through the one-way valve, preventing the urea solution flowing through the one-way valve from crystallizing, and further preventing the crystallized urea solution from clogging the one-way valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 It is a perspective view of the present invention.

[0022] Figure 2 It is a structural schematic diagram of the present invention.

[0023] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0024] Figure 4 yes Figure 2 Enlarged view of point B in the middle.

[0025] Figure 5 yes Figure 2 Enlarged view of point C in the middle.

[0026] Figure 6 yes Figure 2 Enlarged view of point D in the middle.

[0027] Figure 7 yes Figure 2 Enlarged view of point E in the middle.

[0028] In the figure: body 1, air outlet 11, air inlet 12, metering box 13, infusion port 131, liquid inlet 132, annular plate 133, screw 134, infusion groove 135, one-way pressure-stabilizing valve 136, through groove 137, conversion plate 14, connecting hole 141, one-way valve 142, mounting groove 143, spur gear 144, resistance wire 145, groove 15, rack 151, fixing spring 152, cylindrical groove 153, oil channel 154, sealing plug 155, electromagnetic sheet 156, rotating drum 157, bellows 16, baffle 17, connecting spring 171, stirring rod 2, drive motor 21, transmission belt 211, circular groove 212, insertion rod 213, support spring 214, electromagnetic ring 215, card slot 216, mounting frame 22, nozzle 221, blade 23, air hole 231, air channel 232. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0030] like Figures 1 to 7 As shown, the urea hydrolysis reactor feeding device of the present invention includes the following:

[0031] The machine body 1 has an air outlet 11 at its upper end and an air inlet 12 at its lower end. A stirring rod 2 is rotatably connected to the interior of the machine body 1. A driving motor 21 is fixedly mounted on the upper end of the machine body 1. The driving motor 21 is used to drive the stirring rod 2 to rotate. A mounting bracket 22 is mounted on the inner wall of the machine body 1. A nozzle 221 is mounted on the lower end of the mounting bracket 22.

[0032] The metering box 13 is fixedly connected to the surface of the body 1; an infusion port 131 is provided on the surface of the body 1; the infusion port 131 is connected to the metering box 13; a liquid inlet 132 is provided at the bottom of the metering box 13; an annular plate 133 is slidingly and sealedly connected inside the metering box 13; a screw 134 is rotatably connected to the upper end of the annular plate 133; the screw 134 is spirally connected to the metering box 13; an infusion groove 135 connected to the nozzle 221 is provided inside the mounting frame 22; the end of the infusion groove 135 away from the nozzle 221 is connected to the metering box 13; a one-way pressure-stabilizing valve 136 is installed in the infusion groove 135; the infusion port 131 and the infusion groove 135 are distributed up and down; a through groove 137 is provided on the surface of the annular plate 133; a conversion unit is installed in the through groove 137; the conversion unit is used to adjust the flow direction of the through groove 137.

[0033] As an embodiment of the present invention, the conversion unit includes a conversion plate 14; the conversion plate 14 is rotatably sealed and connected to the lower end of the annular plate 133; a connecting hole 141 is opened on the surface of the conversion plate 14; the connecting holes 141 are provided in two groups; one-way valves 142 in opposite directions are installed in the two groups of connecting holes 141; a driving unit is installed inside the body 1; the driving unit is used to drive the conversion plate 14 to rotate.

[0034] As an embodiment of the present invention, the driving unit includes a spur gear 144; the spur gear 144 is rotatably connected to the annular plate 133; a mounting groove 143 is provided on the upper end surface of the conversion plate 14; the screw 134 is fixedly connected to the upper end of the spur gear 144; a groove 15 is provided on the inner wall of the mounting groove 143; a rack 151 meshing with the spur gear 144 is slidingly sealed in the groove 15; the rack 151 is connected to the bottom of the groove 15 by a fixing spring 152; the shapes of the groove 15 and the rack 151 are both set to be arc-shaped.

[0035] As an embodiment of the present invention, a cylindrical groove 153 is provided at the upper end of the screw 134; an oil channel 154 is provided inside the conversion plate 14; one end of the oil channel 154 is connected to the groove 15, and the other end passes through the screw 134 and is connected to the cylindrical groove 153; a sealing plug 155 is slidingly sealed in the cylindrical groove 153; the lower end surface of the sealing plug 155 is inlaid with an electromagnetic sheet 156.

[0036] As an embodiment of the present invention, the drive unit also includes a rotating drum 157; the rotating drum 157 is rotationally connected to the metering box 13; the screw 134 is slidingly connected to the rotating drum 157; the rotating drum 157 and the output shaft of the driving motor 21 are connected by a transmission belt 211; a circular groove 212 is provided on the surface of the output shaft of the driving motor 21; an insertion rod 213 is slidingly sealed in the circular groove 212; the insertion rod 213 and the bottom of the circular groove 212 are connected by a support spring 214; the bottom of the circular groove 212 is inlaid with an electromagnetic ring 215; the inner ring wall of the transmission belt 211 is provided with a card groove 216 that cooperates with the insertion rod 213.

[0037] As an embodiment of the present invention, a bellows 16 is provided in the metering box 13; the bellows 16 is sleeved on the surface of the screw 134; the bellows 16 is made of PTFE material; a baffle 17 is connected to the sliding seal in the infusion port 131; the baffle 17 is connected to the inner wall of the infusion port 131 by a connecting spring 171.

[0038] During operation, in the urea hydrolysis reaction process, the feed of urea solution is usually quantitatively delivered by a metering pump. There are two ways to deliver the urea solution into the hydrolysis reactor: one is direct injection through a pipeline valve, and the other is spraying it into the hydrolysis reactor by spraying. In comparison, spraying has a better distribution effect. During the spraying process, the urea solution can be evenly distributed inside the hydrolysis reactor, improving the fluid flow state and temperature field distribution in the reactor. Especially when treating high-concentration urea solutions, it can effectively prevent the flow unevenness caused by the high viscosity of the solution, thereby improving the overall stability and efficiency of the reaction. However, the spraying feeding rate is relatively slow, which makes it difficult to meet the rapid replenishment of the large flow rate of urea solution required in the initial stage of the reaction. At the same time, under conditions where the temperature of the hydrolysis reactor is high or the concentration of the urea solution used is low, the spraying method cannot quickly deliver enough solution to maintain the temperature and concentration conditions required for the reaction, which will affect the efficiency and system balance of the urea hydrolysis reaction.

[0039] To this end, the present invention controls the manner in which the urea solution enters the body 1 by cooperatively rotating the conversion plate 14 and the annular plate 133 so that the two groups of communication holes 141 on the surface of the conversion plate 14 are respectively connected to the annular plate 133, thereby controlling the manner in which the urea solution enters the body 1. That is, in the initial stage of the reaction, the annular plate 133 is controlled to push the urea solution into the body 1 from the upper infusion port 131, so that a large flow of urea solution can quickly flow into the body 1, shortening the feeding time and improving the efficiency of the urea hydrolysis reaction. Similarly, controlling the urea solution located at the annular plate 133 to flow from the lower infusion tank 135 to the nozzle 221 for spray feeding helps to improve the uniformity of urea distribution in the body 1, thereby improving the overall stability and overall reaction efficiency of the urea hydrolysis reaction.

[0040] In the initial state, the liquid inlet 132 is connected to the external liquid storage tank through a pipeline, and the air inlet 12 is connected to the external water vapor delivery pipeline; in the early stage of the reaction, the user first controls the driving motor 21 to operate, so that the driving motor 21 can drive the rotating drum 157 to rotate through the transmission belt 211, so that the rotating drum 157 drives the screw 134 connected thereto in a sliding manner to rotate, and since the screw 134 is connected to the metering box 13 by a spiral transmission, the rotating screw 134 continuously enters the metering box 13, so that the screw 134 pushes the spur gear in the installation groove 143 The wheel 144 drives the conversion plate 14 to descend synchronously. Since the conversion plate 14 is rotatably connected to the annular plate 133, the conversion plate 14 drives the annular plate 133 to descend synchronously. At the same time, the electromagnetic sheet 156 at the bottom of the sealing plug 155 is energized, so that the electromagnetic sheet 156 generates a magnetic attraction force on the bottom of the cylindrical groove 153, so that the electromagnetic sheet 156 drives the sealing plug 155 to penetrate into the cylindrical groove 153, so that the hydraulic oil in the cylindrical groove 153 is pushed by the sealing plug 155 and enters the groove 15 through the oil passage 154, so that the rack 155 in the groove 15 Under the push of hydraulic oil, the fixing spring 152 is stretched out of the groove 15, so that the rack 151 extending out of the groove 15 approaches the spur gear 144, so that the rack 151 and the spur gear 144 are meshed. As the screw 134 drives the spur gear 144 to rotate, the spur gear 144 can drive the rack 151 to drive the conversion plate 14 to rotate forward, so that the conversion plate 14 drives the connecting holes 141 on the surface to rotate forward, until one group of connecting holes 141 is aligned with the through groove 137 on the surface of the annular plate 133. At this time, the control electromagnetic plate 156 is de-energized. The sealing plug 155 no longer generates a driving force on the hydraulic oil in the cylindrical groove 153, so the rack 151 in the groove 15 is no longer pushed by the hydraulic oil, so that the rack 151 enters the groove 15 under the pulling force of the fixed spring 152, so that the hydraulic oil in the groove 15 is pushed by the rack 151 to flow back to the cylindrical groove 153, so that the sealing plug 155 is reset, and then the drive motor 21 is controlled to reversely drive the screw 134 to rotate, so that the screw 134 pulls the annular plate 133 and the conversion plate 14 to a specified height through the spur gear 144.

[0041] After the connection between the conversion plate 14 and the annular plate 133 is adjusted, the concentrated solution is transported from the external liquid storage tank to the metering box 13 through the liquid inlet 132. At this time, the urea solution entering the metering box 13 is located below the conversion plate 14. Since a pressure regulating valve is installed in the infusion tank 135, the urea solution entering the metering box 13 will not flow directly into the infusion tank 135. When the urea solution injection amount in the metering box 13 reaches a specified height, the drive motor 21 is controlled to drive the screw 134 to rotate forward, so that the screw 134 pushes the The conversion plate 14 drives the annular plate 133 to descend synchronously until the conversion plate 14 contacts the liquid surface of the urea solution. As the conversion plate 14 continues to descend, the urea solution continuously enters the connecting hole 141, and the urea solution entering the connecting hole 141 flows into the through groove 137 through the one-way valve 142, so that the urea solution passes through the through groove 137 to the upper end of the annular plate 133 until the conversion plate 14 reaches the bottom of the metering box 13. At this time, the solution in the metering box 13 flows to the upper end of the annular plate 133 through the connecting hole 141 and the through groove 137.

[0042] The drive motor 21 is controlled to drive the screw 134 to rotate in the opposite direction, so that the screw 134 can pull the annular plate 133 upward, so that the annular plate 133 pushes the urea solution above to rise until the liquid level of the urea solution contacts the upper end surface of the metering box 13. As the annular plate 133 continues to push the urea solution, the urea solution is squeezed and enters the infusion port 131, so that the pressure of the urea solution entering the infusion port 131 continues to increase until the liquid pressure of the urea solution entering the infusion port 131 is greater than the driving force of the connecting spring 171 in the infusion port 131, so that the urea solution pushes the baffle 17 to stretch the connecting spring 171 and move it into the body 1, so that the baffle 17 extends out of the infusion port 131, so that the infusion port 131 is opened, and at this time the urea solution is injected into the body 1 from the infusion port 131.

[0043] After the annular plate 133 pushes the urea solution in the metering box 13 completely into the infusion port 131, the external water vapor delivery pipeline is controlled to deliver 160°C water vapor into the body 1 through the air inlet 12, so that the water vapor entering the body 1 can heat the urea solution in the body 1 during the process of flowing from bottom to top, so that the urea solution is heated to 140-160°C. The water vapor rising to the top of the body 1 will flow out through the air outlet 11 at the upper end of the body 1. At the same time, ammonia and carbon dioxide generated by the hydrolysis of the urea solution due to heating will flow out from the air outlet 11 together with the water vapor. The air outlet 11 is connected to an external ammonia collection device, so that the ammonia discharged from the air outlet 11 can be recovered by the external ammonia collection device.

[0044] During the hydrolysis of the urea solution, the user needs to control the electromagnetic ring 215 to be energized, so that the electromagnetic ring 215 generates a magnetic adsorption force, so that the electromagnetic ring 215 adsorbs the plug 213 and squeezes the support spring 214 into the circular groove 212, so that the plug 213 entering the circular groove 212 extends out of the card slot 216, so that the plug 213 is no longer connected to the transmission belt 211. At this time, the drive motor 21 is controlled to run, so that the drive motor 21 drives the stirring rod 2 to rotate through the output shaft. Since the transmission belt 211 is made of PTFE material, the surface of the transmission belt 211 is smooth. The friction between the transmission belt 211 and the output shaft of the drive motor 21 is reduced, so the drive motor 21 does not drive the transmission belt 211 to rotate. During the rotation of the stirring rod 2, the stirring rod 2 can stir the urea solution in the body 1, thereby ensuring that the urea solution flows evenly in the body 1, so that the water vapor contacts the urea solution in the body 1 evenly, thereby facilitating uniform heat transfer, and keeping the reaction temperature of the urea solution in the body 1 within an ideal range, thereby helping the hydrolysis reaction of the urea solution to proceed quickly and stably.

[0045] During the hydrolysis process of the urea solution, if the temperature of the urea solution is high, it is necessary to reduce the water vapor delivery. At this time, the water in the urea solution in the body 1 will evaporate due to the heat, and the concentration of the urea solution will increase. If the water vapor delivery is excessive, the concentration of the urea solution will decrease. When the concentration of the urea solution changes greatly, it is necessary to continue to add a certain amount of urea solution to the body 1 to ensure that the concentration of the urea solution in the body 1 is stable. That is, the user needs to first control the electromagnetic ring 215 to cut off the power so that the drive motor 21 is connected to the transmission belt 211 through the insertion rod 213, and then control the drive motor 21 to drive the screw 134 to rotate through the transmission belt 211. The drive motor 21 is controlled to drive the screw 134 to pull the conversion plate 14 to a specified height, and then control the external liquid storage tank to deliver a certain amount of urea solution into the metering box 13 until the liquid level of the urea solution contacts the conversion plate 14. At this time, the injection of urea solution into the metering box 13 is completed.

[0046] After the injection of urea solution into the metering box 13 is completed, the drive motor 21 is controlled to drive the screw 134 to push the conversion plate 14 downward, so that the urea solution flows to the top of the conversion plate 14 through the connecting hole 141. Then, the electromagnetic sheet 156 is controlled to be energized, so that the electromagnetic sheet 156 drives the sealing plug 155 to squeeze the hydraulic oil in the cylindrical groove 153 into the groove 15 under the action of magnetic attraction, so that the rack 151 in the groove 15 is pushed out of the groove 15 by the hydraulic oil and meshes with the spur gear 144. At this time, the drive motor 21 is controlled to reverse. The drive motor 21 drives the spur gear 144 to push the conversion plate 14 to rotate in the opposite direction through the rack 151, so that the conversion plate 14 drives the other group of communication holes 141 to face the through groove 137. Since the two groups of communication holes 141 are equipped with one-way valves 142 in opposite directions, the one-way valve 142 in the other group of communication holes 141 can realize that the urea solution at the upper end of the conversion plate 14 passes through the one-way valve 142 and flows to the lower end of the annular plate 133. In the process of the reverse rotation of the screw 134, the screw 134 will pull the conversion plate 1 4 rises, causing the annular plate 133 to push the urea solution upward. When the other group of communicating holes 141 is aligned with the through groove 137, the urea solution at the upper end of the annular plate 133 can flow to the bottom of the conversion plate 14 through the one-way valve 142 in the other group of communicating holes 141, thereby ensuring that the urea solution can be filled between the conversion plate 14 and the bottom of the metering box 13. Compared with adjusting the other group of communicating holes 141 to be aligned with the through groove 137 in advance, it can avoid the urea solution from being injected into the metering box 13 due to the gap between the conversion plate 14 and the metering box. 13, causing the urea solution in the metering box 13 to squeeze the residual gas. As a result, before the urea solution reaches the specified injection volume, the urea solution is squeezed by the residual gas and its pressure increases, so that the pressure on the urea solution is greater than the pre-tightening force of the one-way pressure-stabilizing valve 136 in advance. Therefore, before the urea solution reaches the specified injection volume, the one-way pressure-stabilizing valve 136 is pushed to open in advance, allowing the urea solution to flow from the infusion tank 135 into the body 1, thereby ensuring that the urea solution can be accurately measured in the metering box 13 before the urea solution is injected into the body 1.

[0047] The present invention sets two one-way valves 142 in opposite directions instead of setting a solenoid valve because the solenoid valve needs to be electrically driven and relies on a control signal. It is susceptible to the risk of electromagnetic interference in the sealed space of the hydrolysis reactor. In addition, ordinary solenoid valves are not resistant to high temperatures and are easily affected by control signals and response delays in a closed space. Compared with the solenoid valve, the one-way valve 142 has significant advantages in simple structure, corrosion resistance, high reliability, anti-pollution, and low cost. The flow channel of the one-way valve 142 is unobstructed and there is no problem of impurities adsorbed by the electromagnetic core. In addition, high-temperature resistant solenoid valve products are expensive and difficult to maintain, and are less practical than the one-way valve 142.

[0048] After the urea solution is injected into the metering tank 13, the drive motor 21 is controlled to drive the screw 134 to push the conversion plate 14 downward, so that the conversion plate 14 squeezes the urea solution below and flows through the conveying trough to the nozzle 221, so that the nozzle 221 sprays the urea solution into the body 1. The sprayed urea solution can exchange heat with the rising water vapor during the falling process, thereby preheating the sprayed urea solution to ensure that the hydrolysis reaction temperature of the urea solution in the body 1 is uniform.

[0049] By setting the corrugated plate to be made of PTFE material, the bellows 16 made of PTFE material has corrosion-resistant properties. Since urea solution is corrosive, the setting of the bellows 16 can prevent the urea solution from contacting the screw 134, avoiding the urea solution from corroding the screw 134, ensuring the service life and use effect of the screw 134. At the same time, it can also prevent the urea solution from entering the thread groove on the surface of the screw 134, preventing the urea solution attached to the surface of the screw 134 from crystallizing and clogging the thread groove on the surface of the screw 134 when the screw 134 is not in use, thereby ensuring the normal and stable operation of the screw 134.

[0050] As an embodiment of the present invention, a resistance wire 145 is embedded in the conversion plate 14 .

[0051] As an embodiment of the present invention, the lower end of the stirring rod 2 is rotatably connected to the bottom of the body 1; a blade 23 is fixedly connected to the surface of the stirring rod 2; an air hole 231 is opened on the surface of the blade 23; an air channel 232 is opened inside the stirring rod 2; one end of the air channel 232 is connected to the air hole 231, and the other end is connected to the air inlet 12.

[0052] During operation, since high-concentration urea is prone to crystallization, a resistance wire 145 is embedded in the conversion plate 14 so that the resistance wire 145 can heat the conversion plate 14, and the heated conversion plate 14 can transfer heat to the one-way valve 142, so that the high-concentration urea flowing through the one-way valve 142 is heated, thereby preventing the urea solution flowing through the one-way valve 142 from crystallizing, and further preventing the crystallized urea solution from clogging the one-way valve 142.

[0053] After the water vapor is transported into the air inlet 12 by the water vapor transport pipe, the water vapor will flow through the air channel 232 to the air holes 231 on the surface of the blade 23, so that the water vapor is ejected through the air holes 231. The blade 23 is fixedly connected to the surface of the stirring rod 2, so that the driving motor 21 drives the blade 23 to rotate through the stirring rod 2, so that the water vapor ejected from the air holes 231 on the surface of the rotating blade 23 will flow into the urea solution. At this time, the water vapor entering the urea solution can not only increase the temperature of the urea solution, but also the water vapor can rotate with the blade 23 and promote the mixing of the gas phase and the liquid phase in the body 1 through the stirring effect of the air flow, so as to promote the rapid transfer of heat in the water vapor in the urea solution. In the initial stage, it can accelerate the temperature increase of the urea solution in the body 1 and promote the hydrolysis reaction rate of the urea solution.

[0054] Since the air holes 231 are provided on the lower surface of the blade 23, water vapor is ejected downward through the air holes 231 on the lower surface of the blade 23. The ejected water vapor exists in the urea solution in the form of bubbles. The water vapor bubbles are subjected to inertia and penetrate the urea solution to flow toward the bottom of the body 1. Moreover, due to buoyancy, the water vapor bubbles first decelerate and then accelerate to rise, thereby extending the time the water vapor stays in the body 1 and improving the heating effect of the water vapor on the urea solution. This ensures that the reaction temperature of the urea solution in the body 1 is maintained within an ideal range, thereby facilitating the hydrolysis reaction of the urea solution to proceed rapidly and stably.

[0055] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A urea hydrolysis reactor feeding device, comprising: A machine body (1), wherein an air outlet (11) is provided at the upper end of the machine body (1); an air inlet (12) is provided at the lower end of the machine body (1); a stirring rod (2) is rotatably connected inside the machine body (1); a driving motor (21) is fixedly installed at the upper end of the machine body (1); the driving motor (21) is used to drive the stirring rod (2) to rotate; a mounting bracket (22) is installed on the inner wall of the machine body (1); a nozzle (221) is installed at the lower end of the mounting bracket (22); the machine body (1) is characterized in that: a metering box (13), wherein the metering box (13) is fixedly connected to the surface of the machine body (1); an infusion port (131) is provided on the surface of the machine body (1); the infusion port (131) is communicated with the metering box (13); and a liquid inlet (132) is provided at the bottom of the metering box (13); An annular plate (133) is slidably and sealably connected inside the metering box (13); a screw (134) is rotatably connected to the upper end of the annular plate (133); the screw (134) is spirally connected to the metering box (13); an infusion groove (135) communicating with the nozzle (221) is provided inside the mounting frame (22); the end of the infusion groove (135) away from the nozzle (221) is communicated with the metering box (13); a one-way pressure-stabilizing valve (136) is installed in the infusion groove (135); the infusion port (131) and the infusion groove (135) are distributed up and down; a through groove (137) is provided on the surface of the annular plate (133); a conversion unit is installed in the through groove (137); the conversion unit is used to adjust the flow direction of the through groove (137).

2. A urea hydrolysis reactor feeding device according to claim 1, characterized in that: The conversion unit comprises a conversion plate (14); the conversion plate (14) is rotatably sealed and connected to the lower end of the annular plate (133); a communication hole (141) is provided on the surface of the conversion plate (14); two groups of communication holes (141) are provided; one-way valves (142) with opposite directions are installed in the two groups of communication holes (141); a driving unit is installed inside the body (1); the driving unit is used to drive the conversion plate (14) to rotate.

3. A urea hydrolysis reactor feeding device according to claim 2, characterized in that: The driving unit comprises a spur gear (144); the spur gear (144) is rotatably connected to the annular plate (133); a mounting groove (143) is provided on the upper end surface of the conversion plate (14); the screw (134) is fixedly connected to the upper end of the spur gear (144); a groove (15) is provided on the inner wall of the mounting groove (143); a rack (151) meshing with the spur gear (144) is slidably sealed in the groove (15); the rack (151) is connected to the bottom of the groove (15) via a fixing spring (152); the shapes of the groove (15) and the rack (151) are both set to be arc-shaped.

4. A urea hydrolysis reactor feeding device according to claim 3, characterized in that: A cylindrical groove (153) is provided at the upper end of the screw rod (134); an oil passage (154) is provided inside the conversion plate (14); one end of the oil passage (154) is communicated with the groove (15), and the other end passes through the screw rod (134) and is communicated with the cylindrical groove (153); a sealing plug (155) is connected in a sliding seal in the cylindrical groove (153); an electromagnetic sheet (156) is embedded in the lower end surface of the sealing plug (155).

5. A urea hydrolysis reactor feeding device according to claim 4, characterized in that: The drive unit further comprises a rotating drum (157); the rotating drum (157) is rotationally connected to the metering box (13); the screw rod (134) is slidingly connected to the rotating drum (157); the rotating drum (157) is connected to the output shaft of the driving motor (21) via a transmission belt (211); a circular groove (212) is provided on the surface of the output shaft of the driving motor (21); an insert rod (213) is slidingly and sealingly connected in the circular groove (212); the insert rod (213) is connected to the bottom of the circular groove (212) via a supporting spring (214); an electromagnetic ring (215) is embedded in the bottom of the circular groove (212); and a slot (216) is provided on the inner ring wall of the transmission belt (211) to match the insert rod (213).

6. A urea hydrolysis reactor feeding device according to claim 5, characterized in that: A bellows (16) is provided in the metering box (13); the bellows (16) is sleeved on the surface of the screw (134); the bellows (16) is made of PTFE material; a baffle (17) is slidably sealed in the infusion port (131); the baffle (17) is connected to the inner wall of the infusion port (131) via a connecting spring (171).

7. A urea hydrolysis reactor feeding device according to claim 6, characterized in that: The conversion plate (14) is embedded with a resistance wire (145).

8. A urea hydrolysis reactor feeding device according to claim 7, characterized in that: The lower end of the stirring rod (2) is rotatably connected to the bottom of the machine body (1); a blade (23) is fixedly connected to the surface of the stirring rod (2); an air hole (231) is provided on the surface of the blade (23); an air passage (232) is provided inside the stirring rod (2); one end of the air passage (232) is communicated with the air hole (231), and the other end is communicated with the air inlet (12).

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