Liquid ammonia modified urea deamination device

Abstract

The utility model provides a kind of liquid ammonia changes urea deamination device, it is related to hydrolytic device technical field, including hydrolyzer, feed pipe and blanking tube, the side of hydrolyzer is also equipped with the feeding mechanism matched with feed pipe, the inside of hydrolyzer is equipped with stirring mechanism, and the top of hydrolyzer is equipped with exhaust mechanism;The output end of the utility model pneumatic cylinder is driven piston to slide downwards inside storage chamber by connecting rod, and piston is emptied by air vent inside storage chamber, and high concentration urea water is attracted to flow to the inside of storage chamber using air pressure difference, and then the valve on feed pipe is closed, and the output end of pneumatic cylinder pushes piston to move upwards, and piston pushes high concentration urea water into the inside of feed pipe, and high concentration urea water flows upwards to the inside of hydrolyzer along feed pipe, and the output end of pneumatic cylinder can continuously push piston to move upwards when discharging, and the inside of feed pipe is pressurized, to ensure that high concentration urea water after deamination is discharged smoothly outside by blanking tube.

Description

Technical Field

[0001] This utility model relates to the field of hydrolysis device technology, and in particular to a liquid ammonia to urea deammoniation device. Background Technology

[0002] The liquid ammonia to urea deamination unit employs urea hydrolysis technology. Urea granules are dissolved into a 40%-50% solution, which is then heated by steam to 140-160℃ and 0.4-0.6MPa, decomposing into ammonia and carbon dioxide. The system includes urea storage, dissolution, transportation, hydrolysis reactors, and mixing devices. A stable ammonia supply is achieved through sliding pressure operation and PID control of the steam pressure. This unit boasts high safety and a urea utilization rate exceeding 99%, making it suitable for flue gas denitrification in thermal power plants, chemical plants, and other fields. During the operation of a liquid ammonia-to-urea deammoniation unit, high-concentration urea aqueous solution is prone to side reactions when heated, generating condensates such as biuret, which are poorly soluble in water. These substances gradually deposit on the inner wall of the pipe, forming a scale layer, which reduces the pipe's flow cross-section and increases fluid resistance. As the scale buildup intensifies, it may eventually lead to complete pipe blockage, causing abnormal system pressure, interruption of the hydrolysis reaction, and severely affecting the deammoniation efficiency and stable operation of the unit. Therefore, this invention proposes a liquid ammonia-to-urea deammoniation unit to solve the above problems. Utility Model Content

[0003] To address the aforementioned problems, this invention proposes a liquid ammonia-to-urea deammoniation device to solve the problem that in the prior art, high-concentration urea aqueous solutions easily generate condensates such as biuret, which are insoluble in water, after heating. These substances can cause blockages in the hydrolysis system.

[0004] To achieve the purpose of this utility model, the utility model is implemented through the following technical solution: a liquid ammonia to urea deammoniation device, including a hydrolyzer, a feed pipe and a discharge pipe, one side of the hydrolyzer is connected to the feed pipe, and the other side of the hydrolyzer is also provided with a feeding mechanism matching the feed pipe, the inside of the hydrolyzer is provided with a stirring mechanism, the top of the hydrolyzer is provided with an exhaust mechanism, the bottom of the hydrolyzer is provided with a discharge pipe, and the outside of the hydrolyzer is provided with a jacket.

[0005] A further improvement is made in that: the feeding mechanism includes a storage chamber, a cylinder, a connecting rod, and a piston. The storage chamber is installed on the outside of the jacket, and the cylinder is fixedly installed at the bottom of the jacket. The output end of the cylinder is fixedly connected to the connecting rod, and the top of the connecting rod passes through the interior of the storage chamber and is fixedly connected to the piston. The top of the storage chamber is connected to the feed pipe.

[0006] A further improvement is that the outer wall of the piston is fitted to the inner wall of the storage chamber, a vent hole is provided on one side of the bottom of the storage chamber, and a sealing sleeve is provided at the junction of the connecting rod and the storage chamber.

[0007] A further improvement is that: the hydrolyzer is internally fixedly connected to a fixed frame, the bottom of the fixed frame is fixedly connected to a transfer ring, the top of the transfer ring is annularly mounted with multiple nozzles, and the inside of the transfer ring is connected to one end of the feed pipe.

[0008] A further improvement is that the stirring mechanism includes a rotary motor, a rotary shaft, and stirring blades. The rotary motor is fixedly installed on the top of the hydrolyzer, the rotary shaft is rotatably connected inside the hydrolyzer, multiple stirring blades are fixedly connected to the outside of the rotary shaft, and the top of the rotary shaft is fixedly connected to the output end of the rotary motor.

[0009] A further improvement is that the exhaust mechanism includes an air pump and an air extraction pipe. An air pump is provided on one side of the hydrolyzer, and the input end of the air pump is connected to the air extraction pipe. The top end of the air extraction pipe is connected to the top end of the hydrolyzer.

[0010] A further improvement is that the jacket has an internal cavity structure, one side of the jacket is connected to an air inlet pipe, and one end of the air inlet pipe is connected to a steam generator.

[0011] The beneficial effects of this utility model are as follows: The valve on the feed pipe is opened, and one end of the feed pipe is connected to the high-concentration urea water conveying pipeline. The output end of the cylinder drives the piston to slide downwards inside the storage chamber via a connecting rod. The piston vents the air inside the storage chamber through the vent, creating a negative pressure state inside the storage chamber. The pressure difference attracts the high-concentration urea water to flow into the storage chamber. Then, the valve on the feed pipe is closed, and the output end of the cylinder pushes the piston upwards. The piston pushes the high-concentration urea water into the feed pipe, where it flows upwards along the feed pipe to the hydrolyzer. During discharge, the output end of the cylinder continuously pushes the piston upwards, pressurizing the feed pipe and opening the valve on the discharge pipe to ensure smooth discharge of the deammoniated high-concentration urea water through the discharge pipe. Attached Figure Description

[0012] Figure 1 This is the front view of the present invention; Figure 2 This is a side view of the present invention; Figure 3 This is a front view of the present invention; Figure 4 This is a schematic diagram of the internal structure of the storage chamber of this utility model.

[0013] The components are: 1. Hydrolyzer; 2. Feed pipe; 3. Discharge pipe; 4. Jacket; 5. Storage chamber; 6. Cylinder; 7. Connecting rod; 8. Piston; 9. Fixing frame; 10. Transfer ring; 11. Nozzle; 12. Rotary motor; 13. Rotary shaft; 14. Stirring blade; 15. Air pump; 16. Air extraction pipe; 17. Air inlet pipe. Detailed Implementation

[0014] To deepen the understanding of this utility model, the following detailed description will be provided in conjunction with embodiments. These embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model.

[0015] according to Figure 1-4 As shown, this embodiment proposes a liquid ammonia to urea deammoniation device, including a hydrolyzer 1, a feed pipe 2, and a discharge pipe 3. The feed pipe 2 is connected to one side of the hydrolyzer 1, and a feeding mechanism matching the feed pipe 2 is also provided on one side of the hydrolyzer 1. A stirring mechanism is provided inside the hydrolyzer 1, an exhaust mechanism is provided at the top of the hydrolyzer 1, and the discharge pipe 3 is provided at the bottom of the hydrolyzer 1. A jacket 4 is provided on the outside of the hydrolyzer 1. The feed pipe 2, in cooperation with the feeding mechanism, automatically delivers high-concentration urea solution to the hydrolyzer 1, and during discharge… The feeding mechanism continuously pressurizes the inside of the feed pipe 2 and opens the valve on the discharge pipe 3 to ensure that the high-concentration urea water after ammonia removal is smoothly discharged through the discharge pipe 3. The jacket 4 heats the hydrolyzer 1 with steam to maintain the temperature required for hydrolysis inside the hydrolyzer 1. The stirring mechanism continuously mixes the solution to prevent precipitation or stratification caused by standing and to ensure the concentration of the solution delivered to the hydrolyzer. The ammonia gas generated by hydrolysis flows upward to the top of the hydrolyzer 1, and the exhaust mechanism extracts the ammonia gas from the top of the hydrolyzer 1 for collection and treatment.

[0016] The feeding mechanism includes a storage chamber 5, a cylinder 6, a connecting rod 7, and a piston 8. The storage chamber 5 is installed on the outside of the jacket 4, and the cylinder 6 is fixedly installed at the bottom of the jacket 4. The output end of the cylinder 6 is fixedly connected to the connecting rod 7. The top end of the connecting rod 7 passes through the interior of the storage chamber 5 and is fixedly connected to the piston 8. The top of the storage chamber 5 is connected to the feed pipe 2. The outer wall of the piston 8 is fitted to the inner wall of the storage chamber 5. A vent hole is provided on one side of the bottom of the storage chamber 5. A sealing sleeve is provided at the junction of the connecting rod 7 and the storage chamber 5. When the valve on the feed pipe 2 is opened, one end of the feed pipe 2 is connected to the high-concentration urea water conveying pipeline. The output end of the cylinder 6 drives the piston 8 through the connecting rod 7. The storage chamber 5 slides downwards, and the piston 8 vents the air inside the storage chamber 5 through the vent, creating a negative pressure inside the storage chamber 5. The pressure difference attracts high-concentration urea water to flow into the storage chamber 5. Then, the valve on the feed pipe 2 is closed, and the output end of the cylinder 6 pushes the piston 8 upwards. The piston 8 pushes the high-concentration urea water into the feed pipe 2. The high-concentration urea water flows upwards along the feed pipe 2 into the hydrolyzer 1. During discharge, the output end of the cylinder 6 continues to push the piston 8 upwards, pressurizing the inside of the feed pipe 2 and opening the valve on the discharge pipe 3 to ensure that the high-concentration urea water after ammonia removal is discharged smoothly through the discharge pipe 3.

[0017] The hydrolyzer 1 is fixedly connected to a fixed frame 9. The bottom end of the fixed frame 9 is fixedly connected to a transfer ring 10. Multiple nozzles 11 are installed in a ring on the top of the transfer ring 10. The inside of the transfer ring 10 is connected to one end of the feed pipe 2. The feed pipe 2 delivers high-concentration urea water to the inside of the transfer ring 10. The transfer ring 10 automatically delivers high-concentration urea water to the inside of the hydrolyzer 1 through the nozzles 11.

[0018] The stirring mechanism includes a rotary motor 12, a rotary shaft 13, and stirring blades 14. The rotary motor 12 is fixedly installed on the top of the hydrolyzer 1. The rotary shaft 13 is rotatably connected inside the hydrolyzer 1. Multiple stirring blades 14 are fixedly connected to the outside of the rotary shaft 13. The top end of the rotary shaft 13 is fixedly connected to the output end of the rotary motor 12. The rotary motor 12 drives the stirring blades 14 to rotate inside the hydrolyzer 1 through the rotary shaft 13. The stirring blades 14 continuously mix the solution to prevent precipitation or stratification caused by standing, and ensure the concentration of the solution delivered to the hydrolyzer.

[0019] The exhaust mechanism includes an air pump 15 and an air extraction pipe 16. An air pump 15 is provided on one side of the hydrolyzer 1. The input end of the air pump 15 is connected to the air extraction pipe 16. The top end of the air extraction pipe 16 is connected to the top end of the hydrolyzer 1. The ammonia gas generated by hydrolysis flows upward to the top of the hydrolyzer 1. The air pump 15 and the air extraction pipe 16 work together to extract the ammonia gas from the top of the hydrolyzer 1 and store the ammonia gas in a gas storage tank for convenient centralized treatment.

[0020] The jacket 4 has a cavity structure inside. One side of the jacket 4 is connected to an air inlet pipe 17, and one end of the air inlet pipe 17 is connected to a steam generator. The steam generator transfers energy to the water through a heating device such as an electric heating element or a combustion chamber, raising the water temperature above the boiling point. The water undergoes a phase change from liquid to gas to generate steam, which is transported to the inside of the jacket 4 through the air inlet pipe 17. The flow rate of the steam is controlled by a flow control valve to maintain the temperature required for hydrolysis in the hydrolyzer 1.

[0021] The liquid ammonia to urea deammoniation device opens the valve on the feed pipe 2, connecting one end of the feed pipe 2 to the high-concentration urea water delivery pipeline. The output end of the cylinder 6 drives the piston 8 to slide downward inside the storage chamber 5 via the connecting rod 7. The piston 8 vents the air inside the storage chamber 5 through the vent, creating a negative pressure state inside the storage chamber 5. The pressure difference attracts the high-concentration urea water to flow into the storage chamber 5. Then, the valve on the feed pipe 2 is closed, and the output end of the cylinder 6 pushes the piston 8 upward, pushing the high-concentration urea water into the feed pipe 2. The high-concentration urea water flows upward along the feed pipe 2 to the hydrolyzer 1. During discharge, the output end of the cylinder 6 can continuously push the piston 8 upward, pressurizing the inside of the feed pipe 2 and opening the valve on the discharge pipe 3 to ensure that the deammoniation-free high-concentration urea water flows smoothly out through the discharge pipe 3.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A liquid ammonia to urea deammoniation device, comprising a hydrolyzer (1), a feed pipe (2), and a discharge pipe (3), characterized in that: The hydrolyzer (1) is connected to a feed pipe (2) on one side, and a feeding mechanism matching the feed pipe (2) is also provided on one side of the hydrolyzer (1). The hydrolyzer (1) is equipped with a stirring mechanism inside, an exhaust mechanism at the top of the hydrolyzer (1), a discharge pipe (3) at the bottom of the hydrolyzer (1), and a jacket (4) on the outside of the hydrolyzer (1). The feeding mechanism includes a storage chamber (5), a cylinder (6), a connecting rod (7) and a piston (8). The storage chamber (5) is installed on the outside of the jacket (4). The cylinder (6) is fixedly installed at the bottom of the jacket (4). The output end of the cylinder (6) is fixedly connected to the connecting rod (7). The top end of the connecting rod (7) passes through the inside of the storage chamber (5) and is fixedly connected to the piston (8). The top of the storage chamber (5) is connected to the feed pipe (2).

2. The liquid ammonia to urea deammoniation device according to claim 1, characterized in that: The outer wall of the piston (8) is fitted and connected to the inner wall of the storage chamber (5). A vent hole is provided on one side of the bottom of the storage chamber (5). A sealing sleeve is provided at the junction of the connecting rod (7) and the storage chamber (5).

3. The liquid ammonia to urea deammoniation device according to claim 1, characterized in that: The hydrolyzer (1) is internally fixedly connected to a fixed frame (9), and the bottom end of the fixed frame (9) is fixedly connected to a transfer ring (10). Multiple nozzles (11) are installed in a ring on the top of the transfer ring (10). The interior of the transfer ring (10) is connected to one end of the feed pipe (2).

4. The liquid ammonia to urea deammoniation device according to claim 1, characterized in that: The stirring mechanism includes a rotary motor (12), a rotary shaft (13), and stirring blades (14). The rotary motor (12) is fixedly installed on the top of the hydrolyzer (1). The rotary shaft (13) is rotatably connected inside the hydrolyzer (1). Multiple stirring blades (14) are fixedly connected to the outside of the rotary shaft (13). The top of the rotary shaft (13) is fixedly connected to the output end of the rotary motor (12).

5. The liquid ammonia to urea deammoniation device according to claim 1, characterized in that: The exhaust mechanism includes an air pump (15) and an air extraction pipe (16). The air pump (15) is provided on one side of the hydrolyzer (1). The input end of the air pump (15) is connected to the air extraction pipe (16). The top end of the air extraction pipe (16) is connected to the top end of the hydrolyzer (1).

6. The liquid ammonia to urea deammoniation device according to claim 1, characterized in that: The jacket (4) has a cavity structure inside, and one side of the jacket (4) is connected to an air inlet pipe (17), and one end of the air inlet pipe (17) is connected to a steam generator.

Images