Ammonia synthesis reaction waste heat recovery device
By adopting an S-shaped gas supply channel and heat exchange pipe structure in the ammonia synthesis reaction waste heat recovery device, combined with water temperature detector and water supply valve control, the problem of insufficient heat recovery capacity in the existing technology is solved, and efficient waste heat utilization and steam are achieved Increased output.
Patent Information
- Application Number
- CN202420891540.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-26
AI Technical Summary
In the existing ammonia synthesis process, the insufficient heating capacity of the preheater leads to low waste heat recovery capacity, heavy cooling load of the process gas, and low steam output.
Design a waste heat recovery device for ammonia synthesis reaction, adopting an S-shaped gas supply channel and heat exchange pipe structure, forming an air supply channel through interlaced partitions, and setting a water temperature detector and water supply valve to ensure that the desalination water is in the S-shaped heat exchange pipe and the process The gas undergoes sufficient heat exchange and improves structural stability and energy efficiency through support rods and thermal insulation layers.
It significantly improves heat recovery performance, reduces exhaust temperature and thermal energy losses, and increases steam yield and economic benefits.
Smart Images
Figure CN222279435U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat recovery devices, in particular to an ammonia synthesis reaction waste heat recovery device. Background Art
[0002] The existing ammonia synthesis process gas boiler feed water process is: the deaerator conveys desalted water through the feed water pump into the heater 1. The heater 1 is at high temperature and high pressure. The desalted water is heated to 150°C and then conveyed to the preheater 2 for heat exchange. The high-temperature desalted water after the heat exchange is completed is then conveyed to the boiler 3, and the process gas generated by the ammonia synthesis reaction is used for heat exchange to prepare steam. However, this steam preparation method has the following defects: due to the limited heating capacity of the current preheater 2 for 150°C desalted water, the heat exchange is insufficient, the heat utilization of the ammonia synthesis reaction process gas is insufficient, and the temperature of the process gas after heat exchange is still high, resulting in a heavy cold load at the process gas exhaust port; if the desalted water heated by the heater 1 is directly input into the boiler 3 to prepare steam, the steam output will be low due to the low feed water temperature. Summary of the invention
[0003] The technical problem to be solved by the utility model is that the recovery capacity of the heat recovery device is insufficient, resulting in low recovery capacity of the waste heat from ammonia synthesis and heavy air cooling load of the waste heat process.
[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: an ammonia synthesis reaction waste heat recovery device, including a shell, partitions are staggered on the relative inner walls of the shell to form an S-shaped air supply channel, the two ends of the air supply channel are respectively connected to the air intake pipe and the exhaust pipe, an S-shaped heat exchange tube is fixedly arranged in the air supply channel, and the two ends of the heat exchange tube are respectively connected to the water inlet pipe and the drain pipe.
[0005] Preferably, the flow direction of the process gas in the air supply channel is opposite to the direction of the water flow in the heat exchange tube, and a water temperature detector is arranged on the drain pipe, and the water temperature detector is connected to the water supply valve control of the water inlet pipe.
[0006] Preferably, the set temperature value of the water temperature detector is 240°C.
[0007] Preferably, the heat exchange tube is arranged in parallel between the water inlet pipe and the drain pipe.
[0008] Preferably, the top and the bottom of the movable end of the partition are respectively fixedly connected with support rods, and the support rods are located between adjacent heat exchange tubes.
[0009] Preferably, a heat insulation layer is provided inside the shell.
[0010] 1. The utility model provides a waste heat recovery device for an ammonia synthesis reaction. An S-shaped air delivery channel is provided, and heat exchange tubes are arranged in the air delivery channel accordingly. Desalted water is transported through the heat exchange tubes. The desalted water exchanges heat with the process gas in the air delivery channel during the feeding process. The flow path of the desalted water is increased through a continuous S-shaped structure, and heat exchange is fully performed to ensure that the desalted water reaches a set temperature when discharged.
[0011] 2. The water delivery rate of the water inlet pipe is controlled by a set water temperature detector. When the drainage water temperature does not reach the set value, the opening of the water supply valve is adjusted to reduce the water flow rate and thereby increase the outlet water temperature. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The utility model is further described below in conjunction with the accompanying drawings and embodiments:
[0013] Figure 1 It is a schematic diagram of the internal structure of an embodiment of the utility model.
[0014] Figure 2 It is a partial structural schematic diagram of another embodiment of the utility model.
[0015] In the figure: 1. Shell; 2. Heat exchange tube; 3. Partition; 4. Support rod; 5. Water inlet pipe; 6. Drain pipe; 7. Air inlet pipe; 8. Exhaust pipe; 9. Air supply channel; 10. Thermal insulation layer. DETAILED DESCRIPTION
[0016] like Figure 1 and Figure 2 The utility model provides an ammonia synthesis reaction waste heat recovery device, comprising a shell 1, on the inner side walls of the shell 1, partitions 3 are staggeredly arranged to form an S-shaped air supply channel 9, the two ends of the air supply channel 9 are respectively connected to an air inlet pipe 7 and an exhaust pipe 8, an S-shaped heat exchange tube 2 is fixedly arranged in the air supply channel 9, and the two ends of the heat exchange tube 2 are respectively connected to a water inlet pipe 5 and a drain pipe 6.
[0017] The shell 1 is a rectangular box structure. Partitions 3 are installed on the opposite inner walls of the shell 1 to form an air supply channel 9. The heat exchange tube 2 is installed between adjacent partitions 3, and the air inlet pipe 7 and the exhaust pipe 8 are connected to the air supply channel 9. The water inlet pipe 5 and the drain pipe 6 are connected to the heat exchange tube 2. The high-temperature process gas is transported to the air supply channel 9 through the air inlet pipe 7, and the desalted water is transported to the heat exchange tube 2 through the water inlet pipe 5. During the flow of the desalted water in the heat exchange tube 2, the temperature is increased from the initial 150°C to 240°C. When the high-temperature process gas is discharged from the exhaust pipe 8, the temperature is reduced to 67°C, which is significantly lower than the 86°C of the exhaust gas from the original heat exchanger exhaust pipe, thereby improving the performance of heat recovery, reducing heat energy loss, and reducing the cold load at the end of the exhaust pipe 8, thereby improving economic benefits.
[0018] like Figure 1The flow direction of the process gas in the air supply channel 9 is opposite to the direction of the water flow in the heat exchange tube 2 , and a water temperature detector is arranged on the drain pipe 6 , and the water temperature detector is connected to the water supply valve of the water inlet pipe 5 .
[0019] The water inlet pipe 5 is connected to the bottom end of the heat exchange tube 2, and the drain pipe 6 is connected to the top end of the heat exchange tube 2. Water is supplied at the bottom and drained at the top. The air inlet pipe 7 is connected to the top end of the air supply channel 9, and the exhaust pipe 8 is connected to the bottom end of the air supply channel 9. Air is supplied at the top and exhausted at the bottom. The temperature of each layer in the air supply channel 9 is reduced in steps by utilizing the principle of light specific gravity of high-temperature gas. During the flow of desalted water, it continuously exchanges heat with process gas with a temperature higher than its temperature, and the temperature reaches a maximum value when discharged.
[0020] As a preferred embodiment of the utility model, the set temperature value of the water temperature detector is 240°C. When the drainage temperature is set to 240°C, the temperature of the gas discharged from the exhaust pipe 8 is significantly reduced, and after the desalted water at 240 degrees Celsius is transported to the boiler, high-temperature steam can be generated quickly and in large quantities.
[0021] like Figure 2 As shown, in order to ensure the production of high-temperature steam, the heat exchange tube 2 is arranged in parallel between the water inlet pipe 5 and the drain pipe 6. The air supply channel 9 has a certain width, which can accommodate multiple heat exchange tubes 2 arranged side by side, and the process gas temperature at the same height in the air supply channel 9 is similar, which can meet the temperature increase requirement of the desalted water.
[0022] like Figure 1 and Figure 2 The top and bottom of the movable end of the partition 3 are respectively fixedly connected with support rods 4, and the support rods 4 are located between the adjacent heat exchange tubes 2. The air delivery channel 9 is in a high temperature and high pressure state. By installing the support rods 4 to connect the movable end of the partition 3, the strength of the movable end of the partition 3 can be ensured to avoid deformation that affects the circulation of the process gas.
[0023] like Figure 2 As shown, in order to reduce the heat energy loss of the process gas and eliminate the potential safety hazard caused by the high temperature on the surface of the shell 1, a heat insulation layer 10 is arranged inside the shell 1.
Claims
1. An ammonia synthesis reaction waste heat recovery device, characterized in that: The invention comprises a shell (1), partitions (3) are arranged alternately on the inner side walls of the shell (1) to form an S-shaped air supply channel (9), the two ends of the air supply channel (9) are respectively connected to an air intake pipe (7) and an exhaust pipe (8), an S-shaped heat exchange tube (2) is fixedly arranged in the air supply channel (9), and the two ends of the heat exchange tube (2) are respectively connected to a water intake pipe (5) and a water discharge pipe (6).
2. The waste heat recovery device for ammonia synthesis reaction according to claim 1, characterized in that: The flow direction of the process gas in the air supply channel (9) is opposite to the direction of the water flow in the heat exchange tube (2), and a water temperature detector is arranged on the drainage pipe (6), and the water temperature detector is connected to the water supply valve control of the water inlet pipe (5).
3. The waste heat recovery device for ammonia synthesis reaction as claimed in claim 2, characterized in that: The set temperature value of the water temperature detector is 240°C.
4. The waste heat recovery device for ammonia synthesis reaction according to claim 1, characterized in that: The heat exchange tube (2) is arranged in parallel between the water inlet pipe (5) and the drain pipe (6).
5. The waste heat recovery device for ammonia synthesis reaction as claimed in claim 4, characterized in that: The top and bottom of the movable end of the partition plate (3) are respectively fixedly connected with support rods (4), and the support rods (4) are located between adjacent heat exchange tubes (2).
6. The waste heat recovery device for ammonia synthesis reaction according to claim 1, characterized in that: A heat insulation layer (10) is provided inside the housing (1).