Nitrogen heating device of ammonia synthesis device

Abstract

According to the nitrogen heating device of the ammonia synthesis device, a gas inlet pipe is arranged at the gas inlet end of a first heating tank, an exhaust pipe is arranged at the exhaust end of the first heating tank, a first detection ring, a first valve and a second detection ring are sequentially arranged on the exhaust pipe, a first temperature sensor is arranged in the first detection ring, and a second temperature sensor is arranged in the second detection ring. A second temperature sensor is arranged in the second detection ring, nitrogen is exhausted into a specified reactor through an exhaust pipe, when the temperature of the nitrogen does not reach a specified value, the first valve is closed, the second valve is opened, and the nitrogen enters the second heating tank through the flow dividing pipe to be heated for the second time at the moment; and then the nitrogen is exhausted into a specified reactor from the exhaust pipe through the adapter pipe, so that secondary heating can be performed on the nitrogen, and the uniformity of the temperature of the nitrogen after the nitrogen is heated can be ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of heating devices, specifically a nitrogen heating device for ammonia synthesis plants. Background Technology

[0002] Ammonia synthesis unit refers to industrial equipment used to synthesize ammonia from nitrogen and hydrogen. The process of ammonia synthesis is usually achieved through the Haber process, which requires nitrogen and hydrogen to react under high temperature and high pressure to produce ammonia.

[0003] In ammonia synthesis plants, nitrogen heating devices are a crucial component. Before entering the reactor, nitrogen gas needs to be heated to a certain temperature to increase the reaction rate and improve the efficiency of ammonia synthesis. However, existing nitrogen heating devices typically lack temperature detection mechanisms at the outlet. As a result, heated nitrogen gas is directly discharged into the reactor, leading to uneven nitrogen temperature, which reduces subsequent reaction efficiency and quality. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a nitrogen heating device for ammonia synthesis plants.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a nitrogen heating device for a synthetic ammonia unit, comprising a first heating tank and a second heating tank. The first heating tank and the second heating tank have the same structure, and both the first heating tank and the second heating tank are provided with heating pipes on their inner walls. Each heating pipe has an inlet pipe and an outlet pipe penetrating through the first heating tank and the second heating tank, respectively. The first heating tank has an inlet pipe at its inlet end and an outlet pipe at its outlet end. The outlet pipe is sequentially provided with a first detection ring, a first valve, and a second detection ring. The first detection ring contains a first temperature sensor, and the second detection ring contains a second temperature sensor. A diversion pipe connecting the first detection ring and the first valve is provided between the first detection ring and the first valve, and a second valve is provided on the diversion pipe. The outlet end of the second heating tank is provided with a transfer pipe communicating with the outlet pipe, and the connection point between the transfer pipe and the outlet pipe is located between the first valve and the second detection ring. The first detection ring is connected to both the first valve and the second valve.

[0008] To make the ammonia gas temperature rise more uniformly, the present invention includes the following improvements: both the first and second heating tanks are equipped with a mixing assembly. The mixing assembly includes a top base and a motor. The motor is fixed in the middle part of the top base, and the top base is fixed to one side of the first and second heating tanks respectively. The top base has a driven wheel and a driving wheel inside. Both the driven wheel and the driving wheel are equipped with stirring shafts that are inserted into the first and second heating tanks. The stirring shafts are rotatably connected to the first and second heating tanks. The driving wheel and the driven wheel are connected by a chain, and the output end of the motor is equipped with a transmission shaft connected to the driving wheel.

[0009] Furthermore, an improvement of this utility model is that the motor is a servo motor.

[0010] Furthermore, an improvement of this utility model is that both the first valve and the second valve are solenoid valves.

[0011] To facilitate the assembly of the first and second detection rings, the present invention includes an improvement where both ends of the first and second detection rings are provided with mating flanges, which are then fixed to the exhaust pipe by bolts.

[0012] Furthermore, an improvement of this invention is that the multiple stirring shafts are of the same size.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, this utility model provides a nitrogen heating device for ammonia synthesis plants, which has the following beneficial effects:

[0015] Nitrogen gas is discharged into the designated reactor through the exhaust pipe. When the nitrogen temperature does not reach the specified value, the first valve closes and the second valve opens. At this time, the nitrogen gas will enter the second heating tank through the diversion pipe for a second heating. Then, it will be discharged into the designated reactor through the exhaust pipe via the transfer pipe. This secondary heating of nitrogen gas ensures the uniformity of nitrogen temperature after heating, thereby ensuring the efficiency and quality of subsequent nitrogen reactions. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This utility model Figure 1 The main view;

[0018] Figure 3 This is a schematic diagram of the cooperation structure between the drive wheel and the driven wheel in this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the stirring shaft in this utility model;

[0020] In the diagram: 1. First heating tank; 2. Second heating tank; 3. Feed pipe; 4. Discharge pipe; 5. Transfer pipe; 6. Top seat; 7. Motor; 8. Driven wheel; 9. Drive wheel; 10. Chain; 11. Stirring shaft; 12. Air inlet pipe; 13. First detection ring; 14. Exhaust pipe; 15. First valve; 16. Second detection ring; 17. Diverter pipe; 18. Second valve. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 The nitrogen heating device for a synthetic ammonia unit of this utility model includes a first heating tank 1 and a second heating tank 2. The first heating tank 1 and the second heating tank 2 have the same structure, and both the first heating tank 1 and the second heating tank 2 are provided with heating tubes on their inner walls. The two ends of the heating tubes are provided with inlet pipes 3 and outlet pipes that penetrate the first heating tank 1 and the second heating tank 2, respectively. The air inlet end of the first heating tank 1 is provided with an air inlet pipe 12, and the air outlet end of the first heating tank 1 is provided with an exhaust pipe 14. The exhaust pipe 14 is sequentially provided with a first detection ring 13, a first valve 15, and a second detection ring 16. Ring 16, the first detection ring 13 is provided with a first temperature sensor inside, the second detection ring 16 is provided with a second temperature sensor inside, a diversion pipe 17 connecting the first detection ring 13 and the first valve 15 is provided between the first detection ring 13 and the first valve 15, the diversion pipe 17 is provided with a second valve 18, the exhaust end of the second heating tank 2 is provided with a transfer pipe 5 communicating with the exhaust pipe 14, and the connection point between the transfer pipe 5 and the exhaust pipe 14 is located between the first valve 15 and the second detection ring 16, the first detection ring 13 is connected to the first valve 15 and the second valve 18;

[0023] When this structure is in use, the hot medium flowing into the feed pipe 3 can be hot oil or high-temperature steam, which will enter the heating pipe and then flow back into the designated equipment in the discharge pipe, thereby enabling the heating pipes on the inner walls of the first heating tank 1 and the second heating tank 2 to generate heat.

[0024] Because the first heating tank 1 has a high temperature, when nitrogen enters the first heating tank 1 through the inlet pipe 12, it will immediately heat up. The heated nitrogen will then enter the first detection ring 13 through the exhaust pipe 14. At this time, the first temperature sensor in the first detection ring 13 can monitor the heated nitrogen (specifically, the first and second temperature sensors can be connected to a designated control device, which will then connect to the control circuits of the first valve 15 and the second valve 18; the control circuits of each component will not be described in detail here). When the nitrogen temperature reaches the specified value, the second valve 18 is closed, and the nitrogen flows through the exhaust pipe 14. The nitrogen gas can be discharged into the designated reactor through pipe 14. When the nitrogen temperature does not reach the specified value, the first valve 15 closes and the second valve 18 opens. At this time, the nitrogen gas will enter the second heating tank 2 through the diversion pipe 17 for a second heating. Then, it will be discharged into the designated reactor through the exhaust pipe 14 through the transfer pipe 5. During this process, the nitrogen temperature at the outlet of the exhaust pipe 14 can be monitored at all times through the second detection ring 16. When the nitrogen temperature at the outlet of the exhaust pipe 14 still does not reach the specified value, the entire equipment needs to be overhauled. This can perform secondary heating of the nitrogen gas and ensure the uniformity of the nitrogen temperature after heating, thereby ensuring the subsequent reaction efficiency and reaction quality of the nitrogen gas.

[0025] In this embodiment, both the first heating tank 1 and the second heating tank 2 are equipped with a mixing assembly. The mixing assembly includes a top seat 6 and a motor 7. The motor 7 is fixed to the middle part of the top seat 6. The top seat 6 is fixed to one side of the first heating tank 1 and the second heating tank 2, respectively. The top seat 6 has a driven wheel 8 and a driving wheel 9 inside. Both the driven wheel 8 and the driving wheel 9 are equipped with stirring shafts 11 that are inserted into the first heating tank 1 and the second heating tank 2. The stirring shafts 11 are rotatably connected to the first heating tank 1 and the second heating tank 2. The driving wheel 9 and the driven wheel 8 are connected by a chain 10, and the output end of the motor 7 is provided with a transmission shaft connected to the driving wheel 9. When the motor 7 is started, the driving wheel 9 can drive multiple driven wheels 8 to rotate through the chain 10, thereby enabling multiple stirring shafts 11 to rotate inside the first heating tank 1 and the second heating tank 2. This provides a mixing effect for the nitrogen inside the first heating tank 1 and the second heating tank 2, and can further improve the uniformity of nitrogen during heating. The wrap angle of the chain 10 is not mandatory, but a recommended wrap angle is usually above 120 degrees for the air inlet pipe.

[0026] In this embodiment, the motor 7 can be a servo motor, and the first valve 15 and the second valve 18 can both be solenoid valves.

[0027] When it is necessary to disassemble the first temperature sensor and the second temperature sensor, the first detection ring 13 and the second detection ring 16 need to be disassembled. Both ends of the first detection ring 13 and the second detection ring 16 are provided with docking flanges. The docking flanges are fixed to the exhaust pipe 14 by bolts. The bolt fixing method has the advantage of convenient assembly, which makes it easy to disassemble the first detection ring 13 and the second detection ring 16.

[0028] In this embodiment, the plurality of stirring shafts 11 are of the same size.

[0029] In the description herein, it should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A nitrogen heating device for an ammonia synthesis unit, comprising a first heating tank (1) and a second heating tank (2), wherein the first heating tank (1) and the second heating tank (2) have the same structure, and both the first heating tank (1) and the second heating tank (2) are provided with heating pipes on their inner walls, and both ends of the heating pipes are provided with inlet pipes (3) and outlet pipes (4) penetrating the first heating tank (1) and the second heating tank (2), characterized in that: The first heating tank (1) has an air inlet pipe (12) at its air inlet end and an exhaust pipe (14) at its exhaust end. The exhaust pipe (14) is provided with a first detection ring (13), a first valve (15), and a second detection ring (16) in sequence. The first detection ring (13) is provided with a first temperature sensor inside, and the second detection ring (16) is provided with a second temperature sensor inside. A diversion pipe (17) connecting the first detection ring (13) and the first valve (15) is provided between the first detection ring (13) and the first valve (15). A second valve (18) is provided on the diversion pipe (17). The exhaust end of the second heating tank (2) is provided with a transfer pipe (5) that communicates with the exhaust pipe (14). The connection point between the transfer pipe (5) and the exhaust pipe (14) is located between the first valve (15) and the second detection ring (16). The first detection ring (13) is connected to the first valve (15) and the second valve (18).

2. The nitrogen heating device for ammonia synthesis unit according to claim 1, characterized in that: Both the first heating tank (1) and the second heating tank (2) are equipped with a mixing component. The mixing component includes a top seat (6) and a motor (7). The motor (7) is fixed in the middle part of the top seat (6). The top seat (6) is fixed on one side of the first heating tank (1) and the second heating tank (2). The top seat (6) is equipped with a driven wheel (8) and a driving wheel (9). Both the driven wheel (8) and the driving wheel (9) are equipped with stirring shafts (11) that are inserted into the first heating tank (1) and the second heating tank (2). The stirring shafts (11) are rotatably connected to the first heating tank (1) and the second heating tank (2). The driving wheel (9) and the driven wheel (8) are connected by a chain (10). The output end of the motor (7) is equipped with a transmission shaft that connects to the driving wheel (9).

3. The nitrogen heating device for ammonia synthesis unit according to claim 2, characterized in that: The motor (7) is a servo motor.

4. The nitrogen heating device for ammonia synthesis unit according to claim 3, characterized in that: Both the first valve (15) and the second valve (18) are solenoid valves.

5. The nitrogen heating device for ammonia synthesis unit according to claim 4, characterized in that: Both ends of the first detection ring (13) and the second detection ring (16) are provided with docking flanges, and the docking flanges are fixed to the exhaust pipe (14) by bolts.

6. The nitrogen heating device for ammonia synthesis unit according to claim 5, characterized in that: The multiple stirring shafts (11) are of the same size.

Images