Efficient ammonia production device based on temperature regulation and urea pyrolysis
By employing temperature control and multi-atomization design, the problems of uneven urea dissolution and atomization were solved, enabling efficient operation of the urea pyrolysis ammonia production unit and improving urea conversion rate and ammonia generation efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-22
- Publication Date
- 2026-06-23
AI Technical Summary
Existing urea pyrolysis ammonia production equipment makes it difficult to dissolve urea quickly and fully in water, and the atomization design is simple, resulting in incomplete pyrolysis.
Temperature is controlled by dual temperature sensors and a heating layer. Combined with a stirring mechanism and atomization design of rotating and fixed nozzles, it ensures that urea dissolves quickly and atomizes evenly at the optimal pyrolysis temperature, increasing the contact area with high-temperature hot air.
This significantly improves the urea pyrolysis conversion rate and ammonia generation efficiency, reduces raw material waste, and ensures the rapid progress of the pyrolysis reaction.
Smart Images
Figure CN224388800U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of urea pyrolysis ammonia production equipment, specifically a high-efficiency urea pyrolysis ammonia production equipment based on temperature control. Background Technology
[0002] Urea pyrolysis ammonia production unit is a key supporting system for SCR denitrification in thermal power plants, industrial boilers, etc. Its core function is to pyrolyze high-purity urea solution in a high-temperature reactor (usually 450-650℃) to decompose it into reducing agents required for the denitrification reaction—ammonia, carbon dioxide, and water. The unit typically includes urea solution supply, metering, atomization injection, pyrolysis furnace, and control system. It features high safety (avoiding the risks of liquid ammonia storage and transportation), high degree of automation, and fast response speed, and is a reliable technical path to achieve ultra-low nitrogen oxide emissions.
[0003] Existing urea pyrolysis ammonia production equipment makes it difficult to dissolve urea quickly and fully in water, which easily leads to uneven urea dissolution, creating hidden dangers for subsequent pyrolysis reactions and resulting in incomplete pyrolysis. In addition, the atomization design is relatively simple, relying only on ordinary nozzles for atomization, which makes it difficult to ensure that the atomized urea droplets are evenly suspended in the pyrolysis tank.
[0004] Based on this, a high-efficiency urea pyrolysis ammonia production device based on temperature control is now provided, which can eliminate the drawbacks of existing devices. Utility Model Content
[0005] The purpose of this invention is to provide a high-efficiency urea pyrolysis ammonia production device based on temperature control, so as to solve the problem in the prior art that it is difficult to make urea dissolve quickly and fully in water.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] A high-efficiency urea pyrolysis ammonia production device based on temperature control includes a base, a pyrolysis tank is provided on one side of the top of the base, a first top cover is provided on the top of the pyrolysis tank, an air outlet pipe is provided at the center point of the top of the first top cover, a stirring tank is provided on the other side of the top of the base, and a water pump is provided on the top of the base and between the pyrolysis tank and the stirring tank.
[0008] The pyrolysis tank is provided with an atomizing mechanism on its exterior, and an air intake mechanism is provided on its exterior and below the atomizing mechanism. The inner wall of the pyrolysis tank is provided with a second heating layer, and a second temperature sensor is provided on the inner wall of the pyrolysis tank and above the second heating layer.
[0009] Based on the above technical solutions, this utility model also provides the following optional technical solutions:
[0010] In one alternative: the air intake mechanism includes an air intake pipe, which is fixedly installed on the outside of the pyrolysis tank. A first temperature sensor is provided on the inner wall of the air intake pipe near the end of the pyrolysis tank, and a first heating layer is provided on the inner wall of the air intake pipe.
[0011] In one alternative embodiment: the atomizing mechanism includes a liquid-distributing ring, which is sleeved on the outside of the pyrolysis tank. Multiple connecting pipes are arranged in a ring at equal intervals at the bottom of the liquid-distributing ring. One end of each of the multiple connecting pipes passes through the pyrolysis tank and is rotatably mounted with a rotating nozzle. Multiple fixed nozzles are arranged in a ring at equal intervals on the outside of each of the multiple rotating nozzles.
[0012] In one alternative: the input end of the water pump is connected to the mixing tank via a conduit, and the output end of the water pump is connected to the liquid separator via a conduit.
[0013] In one alternative: a feeding mechanism is provided on the outside of the mixing tank, and a mixing mechanism is provided inside the mixing tank.
[0014] In one alternative embodiment: the feeding mechanism includes a conveying pipe, which is fixedly installed outside the mixing tank. A conveying rod is rotatably installed inside the conveying pipe via a bearing. A first motor is fixedly installed at one end of the conveying pipe, and the conveying rod is driven by the first motor. A feeding hopper is provided at the top of the conveying pipe.
[0015] In one alternative embodiment: the stirring mechanism includes three stirring rollers, all three stirring rollers are rotatably mounted inside the stirring tank via bearings, the tops of the three stirring rollers penetrate the stirring tank and are connected to a first gear, the three first gears are meshed with a second gear, and the second gear is rotatably mounted to the stirring tank via a bearing.
[0016] In one alternative: a second top cover is fixedly installed on the top of the mixing tank, and a second motor is fixedly installed at the center point of the top of the second top cover, and the second gear is driven by the second motor.
[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0018] 1. This utility model achieves precise control of the temperature of the introduced hot gas and the pyrolysis temperature inside the tank through dual temperature detection and regulation by a first temperature sensor and a first heating layer and a second temperature sensor and a second heating layer, ensuring that urea always reacts in the optimal pyrolysis temperature environment, greatly improving the urea pyrolysis conversion rate and ammonia generation efficiency, and reducing raw material waste.
[0019] 2. This utility model utilizes three stirring rollers of the stirring mechanism to simultaneously stir, enabling urea to quickly dissolve in water and form a uniform solution, thus avoiding incomplete subsequent pyrolysis due to uneven urea dissolution. At the same time, the atomization design combining rotating and fixed nozzles allows the rotating nozzle to rotate during atomization, uniformly suspending the tiny droplets of urea solution inside the pyrolysis tank, increasing the contact area with high-temperature hot air, and further promoting the rapid progress of the pyrolysis reaction. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0021] Figure 2 This is a schematic diagram of the internal structure of the pyrolysis tank of this utility model.
[0022] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle.
[0023] Figure 4 This is a schematic diagram of the stirring mechanism of this utility model.
[0024] Figure 5 This is a schematic diagram of the air intake mechanism of this utility model.
[0025] Figure reference numerals: 1. Base; 2. Pyrolysis tank; 3. First top cover; 4. Air outlet pipe; 5. Atomizing mechanism; 51. Liquid separating ring; 52. Connecting pipe; 53. Rotating nozzle; 54. Fixed nozzle; 6. Mixing tank; 7. Feeding mechanism; 71. Conveying pipe; 72. Conveying rod; 73. First motor; 74. Feed hopper; 8. Second top cover; 9. Mixing mechanism; 91. Mixing roller; 92. First gear; 93. Second gear; 94. Second motor; 10. Water pump; 11. Air inlet mechanism; 111. Air inlet pipe; 112. First temperature sensor; 113. First heating layer; 12. Second heating layer; 13. Second temperature sensor. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.
[0027] In one embodiment, such as Figures 1-5 As shown, a high-efficiency urea pyrolysis ammonia production device based on temperature control includes a base 1, a pyrolysis tank 2 is provided on one side of the top of the base 1, a first top cover 3 is provided on the top of the pyrolysis tank 2, an air outlet pipe 4 is provided at the center point of the top of the first top cover 3, a stirring tank 6 is provided on the other side of the top of the base 1, and a water pump 10 is provided on the top of the base 1 and between the pyrolysis tank 2 and the stirring tank 6.
[0028] The pyrolysis tank 2 is provided with an atomizing mechanism 5 on its exterior. An air intake mechanism 11 is provided on the exterior of the pyrolysis tank 2 and below the atomizing mechanism 5. A second heating layer 12 is provided on the inner wall of the pyrolysis tank 2. A second temperature sensor 13 is provided on the inner wall of the pyrolysis tank 2 and above the second heating layer 12.
[0029] In this embodiment, through dual temperature detection and regulation via the first temperature sensor 112 and the first heating layer 113, and the second temperature sensor 13 and the second heating layer 12, precise control of the temperature of the introduced hot gas and the pyrolysis temperature inside the tank is achieved, ensuring that urea always reacts under the optimal pyrolysis temperature environment, significantly improving the urea pyrolysis conversion rate and ammonia generation efficiency, and reducing raw material waste. With the synchronous stirring of the three stirring rollers 91 of the stirring mechanism 9, urea can be quickly dissolved in water to form a uniform solution, avoiding insufficient subsequent pyrolysis due to uneven urea dissolution. At the same time, the atomization design combining the rotating nozzle 53 and the fixed nozzle 54 allows the rotating nozzle 53 to rotate during the atomization process, which can uniformly suspend the tiny droplets of urea solution atomized into the inside of the pyrolysis tank 2, increasing the contact area with the high-temperature hot gas and further promoting the rapid progress of the pyrolysis reaction.
[0030] In one embodiment, such as Figure 1 and Figure 5 As shown, the air intake mechanism 11 includes an air intake pipe 111, which is fixedly installed on the outside of the pyrolysis tank 2. A first temperature sensor 112 is provided on the inner wall of the air intake pipe 111 and near the end of the pyrolysis tank 2. A first heating layer 113 is provided on the inner wall of the air intake pipe 111. The first temperature sensor 112 on the inner wall of the air intake pipe 111 detects the temperature of the introduced hot air in real time. If the temperature does not reach the standard required for urea pyrolysis, the first heating layer 113 immediately works to heat the hot air to ensure that the temperature of the hot air entering the pyrolysis tank 2 meets the requirements.
[0031] In one embodiment, such as Figure 2 and Figure 3As shown, the atomizing mechanism 5 includes a liquid-distributing ring 51, which is sleeved on the outside of the pyrolysis tank 2. Multiple connecting pipes 52 are equidistantly arranged in a ring at the bottom of the liquid-distributing ring 51. One end of each connecting pipe 52 penetrates the pyrolysis tank 2 and is rotatably mounted with a rotating nozzle 53. Multiple fixed nozzles 54 are equidistantly arranged in a ring around the outside of each rotating nozzle 53. The input end of the water pump 10 is connected to the stirring tank 6 via a conduit, and the output end of the water pump 10 is connected to the liquid-distributing ring 51 via a conduit. The urea solution in the stirring tank 6 is transported to the liquid distribution ring 51 outside the pyrolysis tank 2 through the conduit. The urea solution is distributed to multiple connecting pipes 52 through the liquid distribution ring 51, and then transported to the rotating nozzle 53 inside the pyrolysis tank 2 through the connecting pipes 52. Finally, the rotating nozzle 53 and the fixed nozzle 54 outside are used together to atomize and spray out to form tiny droplets. When the fixed nozzle 54 sprays out, due to the action and reaction forces, the rotating nozzle 53 rotates, thereby making the tiny droplets of urea solution atomized into a uniform suspension inside the pyrolysis tank 2.
[0032] In one embodiment, such as Figure 1 and Figure 4 As shown, a feeding mechanism 7 is provided on the outside of the mixing tank 6, and a stirring mechanism 9 is provided inside the mixing tank 6. The feeding mechanism 7 includes a conveying pipe 71, which is fixedly installed on the outside of the mixing tank 6. A conveying rod 72 is rotatably installed inside the conveying pipe 71 via a bearing. A first motor 73 is fixedly installed at one end of the conveying pipe 71, and the conveying rod 72 is driven by the first motor 73. A feed hopper 74 is provided at the top of the conveying pipe 71. When the first motor 73 is started, it drives the conveying rod 72 inside the conveying pipe 71 to rotate. Urea enters the conveying pipe 71 from the feed hopper 74 and is then conveyed to the mixing tank 6 by the conveying rod 72.
[0033] In one embodiment, such as Figure 1 and Figure 4 As shown, the stirring mechanism 9 includes three stirring rollers 91, all of which are rotatably mounted inside the stirring tank 6 via bearings. The tops of the three stirring rollers 91 penetrate the stirring tank 6 and are connected to a first gear 92. A second gear 93 meshes with the three first gears 92 and is rotatably mounted to the stirring tank 6 via bearings. A second top cover 8 is fixedly mounted on the top of the stirring tank 6, and a second motor 94 is fixedly mounted at the center point of the top of the second top cover 8. The second gear 93 is driven by the second motor 94. When the second motor 94 is started, it drives the second gear 93 to rotate. Through meshing with the three first gears 92, the second gear 93 drives the three stirring rollers 91 inside the stirring tank 6 to rotate synchronously, so that urea is quickly and fully dissolved in water to form a uniform urea solution.
[0034] The above embodiment discloses a high-efficiency urea pyrolysis ammonia production device based on temperature control. In this device, the first motor 73 is started, which drives the conveying rod 72 in the conveying pipe 71 to rotate. Urea enters the conveying pipe 71 from the feed hopper 74 and is then conveyed to the mixing tank 6 by the conveying rod 72. After adding an appropriate amount of water to the mixing tank 6, the second motor 94 is started, which drives the second gear 93 to rotate. The second gear 93, through meshing with the three first gears 92, drives the three stirring rollers 91 in the mixing tank 6 to rotate synchronously, so that the urea can be quickly and fully dissolved in the water to form a uniform urea solution.
[0035] Then, water pump 10 is started. Water pump 10 transports the urea solution in the stirring tank 6 to the liquid distribution ring 51 outside the pyrolysis tank 2 through the conduit. The urea solution is distributed to multiple connecting pipes 52 through the liquid distribution ring 51, and then transported to the rotating nozzle 53 inside the pyrolysis tank 2 through the connecting pipes 52. Finally, the rotating nozzle 53 and the external fixed nozzle 54 are used together to atomize and spray out, forming tiny droplets. At the same time, high-temperature hot air is introduced into the pyrolysis tank 2 through the air inlet pipe 111 of the air inlet mechanism 11. The first temperature sensor 112 on the inner wall of the air inlet pipe 111 detects the temperature of the introduced hot air in real time. If the temperature does not reach the standard required for urea pyrolysis, the hot air will be released. The first heating layer 113 immediately starts working to heat the hot gas, ensuring that the temperature of the hot gas entering the pyrolysis tank 2 meets the requirements. The atomized urea droplets come into full contact with the high-temperature hot gas in the pyrolysis tank 2, and the pyrolysis reaction begins under the catalytic action of the hot gas to generate ammonia. The second temperature sensor 13 on the inner wall of the pyrolysis tank 2 further detects the temperature of the reaction area inside the tank. If the temperature is still not up to standard, the second heating layer 12 starts working to perform secondary temperature control inside the pyrolysis tank 2 to ensure that the pyrolysis reaction continues to proceed efficiently. The ammonia gas finally generated is discharged through the gas outlet pipe 4 on the first top cover 3 at the top of the pyrolysis tank 2 for subsequent denitrification and other processes.
[0036] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A high-efficiency urea pyrolysis ammonia production device based on temperature control, comprising a base (1), a pyrolysis tank (2) provided on one side of the top of the base (1), a first top cover (3) provided on the top of the pyrolysis tank (2), an exhaust pipe (4) provided at the center point of the top of the first top cover (3), a stirring tank (6) provided on the other side of the top of the base (1), and a water pump (10) provided on the top of the base (1) and between the pyrolysis tank (2) and the stirring tank (6); Its features are, The pyrolysis tank (2) is provided with an atomizing mechanism (5) on its exterior. An air intake mechanism (11) is provided on the exterior of the pyrolysis tank (2) and below the atomizing mechanism (5). A second heating layer (12) is provided on the inner wall of the pyrolysis tank (2). A second temperature sensor (13) is provided on the inner wall of the pyrolysis tank (2) and above the second heating layer (12).
2. The high-efficiency urea pyrolysis ammonia production device based on temperature control according to claim 1, characterized in that, The air intake mechanism (11) includes an air intake pipe (111), which is fixedly installed on the outside of the pyrolysis tank (2). A first temperature sensor (112) is provided on the inner wall of the air intake pipe (111) and near the end of the pyrolysis tank (2). A first heating layer (113) is provided on the inner wall of the air intake pipe (111).
3. The high-efficiency urea pyrolysis ammonia production device based on temperature control according to claim 1, characterized in that, The atomizing mechanism (5) includes a liquid separating ring (51), which is sleeved on the outside of the pyrolysis tank (2). Multiple connecting pipes (52) are arranged in a ring at equal intervals at the bottom of the liquid separating ring (51). One end of each of the multiple connecting pipes (52) passes through the pyrolysis tank (2) and is rotatably mounted with a rotating nozzle (53). Multiple fixed nozzles (54) are arranged in a ring at equal intervals on the outside of the multiple rotating nozzles (53).
4. The high-efficiency urea pyrolysis ammonia production device based on temperature control according to claim 3, characterized in that, The input end of the water pump (10) is connected to the mixing tank (6) through a conduit, and the output end of the water pump (10) is connected to the liquid separator (51) through a conduit.
5. The high-efficiency urea pyrolysis ammonia production device based on temperature control according to claim 1, characterized in that, The mixing tank (6) is provided with a feeding mechanism (7) on the outside and a mixing mechanism (9) on the inside.
6. The high-efficiency urea pyrolysis ammonia production device based on temperature control according to claim 5, characterized in that, The feeding mechanism (7) includes a feeding pipe (71), which is fixedly installed on the outside of the mixing tank (6). A feeding rod (72) is rotatably installed inside the feeding pipe (71) through a bearing. A first motor (73) is fixedly installed at one end of the feeding pipe (71). The feeding rod (72) is driven by the first motor (73). A feeding hopper (74) is provided at the top of the feeding pipe (71).
7. The high-efficiency urea pyrolysis ammonia production device based on temperature control according to claim 5, characterized in that, The stirring mechanism (9) includes three stirring rollers (91). All three stirring rollers (91) are rotatably mounted inside the stirring tank (6) via bearings. The tops of the three stirring rollers (91) penetrate the stirring tank (6) and are connected to a first gear (92). A second gear (93) meshes between the three first gears (92), and the second gear (93) is rotatably mounted to the stirring tank (6) via bearings.
8. The high-efficiency urea pyrolysis ammonia production device based on temperature control according to claim 7, characterized in that, The top of the mixing tank (6) is fixedly installed with a second top cover (8), and a second motor (94) is fixedly installed at the center point of the top of the second top cover (8). The second gear (93) is driven by the second motor (94).