Novel ammonia reactor for preparing green ammonia

Abstract

The invention discloses a novel ammonia reactor for green ammonia preparation, and relates to the technical field of green ammonia preparation, the novel ammonia reactor specifically comprises an ammonia reactor body, a heat exchange space is arranged in the ammonia reactor body, and a plurality of heat exchange tubes filled with catalysts are sleeved with the heat exchange space; a temperature measuring sleeve extending out of the top of the ammonia reactor body is sleeved with one heat exchange pipe, a plurality of thermocouple temperature measuring points are arranged in the temperature measuring sleeve from top to bottom, and an air inlet distributor outputting towards the top end openings of the heat exchange pipes is sleeved with the top of the ammonia reactor body. The gas inlet distributor comprises a gas inlet distributor shell sleeved in the top of the ammonia reactor body, and a uniform gas distribution disc is sleeved in the bottom of the gas inlet distributor shell. The temperature monitoring is more accurate, that is, the temperature of the catalyst bed layer can be accurately monitored by utilizing the temperature measuring sleeve and a plurality of thermocouple temperature monitoring points arranged in the temperature measuring sleeve, and accurate data support is provided for reaction temperature control.

Description

TECHNICAL FIELD

[0001] The application relates to the field of green ammonia preparation, and particularly relates to a novel ammonia reactor for green ammonia preparation. BACKGROUND

[0002] Under the background of energy transformation, green ammonia as a potential clean energy carrier has attracted extensive attention, and ammonia synthesis reaction is a core link in the preparation process of green ammonia, which usually needs to be carried out under harsh conditions of high temperature and high pressure.

[0003] However, the traditional ammonia reactor has many problems in the preparation process of green ammonia, for example, the reactor internals are complex, the raw material gas is not uniformly distributed in the reactor, the catalyst cannot be fully utilized, the reaction efficiency is low, the heat exchange efficiency is low, the heat in the reaction process cannot be effectively recovered and utilized, energy is wasted, the temperature of the catalyst bed cannot be accurately monitored, and the reaction parameters cannot be adjusted in real time, the stability of the reaction and the yield of ammonia are affected, the function of the inlet gas distributor is single, and the inlet gas distributor is mostly a porous pipe structure, which can only meet the basic uniform distribution effect and is suitable for a single environment. SUMMARY

[0004] The application provides a novel ammonia reactor for green ammonia preparation, which solves the technical problems in the background.

[0005] In order to achieve the above purpose, the application adopts the following technical scheme: a novel ammonia reactor for green ammonia preparation, comprising an ammonia reactor body, a heat exchange space is arranged in the ammonia reactor body, a plurality of heat exchange pipes filled with catalysts are sleeved in the heat exchange space, one of the heat exchange pipes is sleeved with a temperature measuring sleeve extending to the top of the ammonia reactor body, a plurality of thermocouple temperature measuring points are arranged in the temperature measuring sleeve from top to bottom, an inlet gas distributor is sleeved in the top of the ammonia reactor body and outputs towards the top port of the heat exchange pipe, the inlet gas distributor comprises an inlet gas distributor shell sleeved in the top of the ammonia reactor body, a uniform gas distribution disc is sleeved in the bottom of the inlet gas distributor shell, and a plurality of first gas outlet holes and a plurality of second gas outlet holes are arranged in the inner ring structure and the outer ring structure of the uniform gas distribution disc respectively.

[0006] Preferably, the ammonia reactor body comprises a reactor cylinder body, an upper tube plate and a lower tube plate are fixed to the top and the bottom of the reactor cylinder body respectively, an assembly box is fixedly installed on the top of the upper tube plate and the bottom of the lower tube plate, and a refractory material and an anchor nail are arranged on the inner wall of the assembly box, the anchor nail is nested in the inside of the refractory material, the two ends of the heat exchange pipe extend into the two assembly boxes respectively, a reaction gas outlet pipe is arranged at the bottom of one of the assembly boxes, and a raw material gas inlet pipe and a pressure measuring pipe are arranged at the top of the other assembly box.

[0007] Preferably, the heat exchange space is arranged inside the reactor cylinder, the top and bottom of one side of the reactor cylinder are respectively provided with a heat conducting medium inlet pipe and a temperature measuring pipe, the bottom of the other side of the reactor cylinder is provided with a heat conducting medium outlet, the inside of the reactor cylinder is alternately sleeved from top to bottom with a plurality of first baffles and a plurality of second baffles, and the two sides of the bottom of the reactor cylinder are both fixed with lug supports.

[0008] Preferably, a transition structure is arranged at the sleeving position between the bottom of the heat exchange pipe and the lower tube plate, the transition structure comprises a catalyst support arranged in the bottom end of the heat exchange pipe, a ceramic sleeve pipe penetrating through the corresponding refractory material is fixedly sleeved in the bottom port of the heat exchange pipe, ceramic fiber paper is sleeved at the sleeving position between the ceramic sleeve pipe and the bottom port of the heat exchange pipe, and a refractory material guard plate is sleeved at the connecting position between the surface of the refractory material and the corresponding lower tube plate.

[0009] Preferably, the first gas outlet hole and the second gas outlet hole are both arranged as tapered holes with the top smaller and the bottom larger, and the diameter value of the top port of the first gas outlet hole is smaller than that of the top port of the second gas outlet hole.

[0010] Preferably, the top port of the gas inlet distributor shell is sleeved in the inside of the middle part of the assembled box body arranged at the top of the upper tube plate, and the top port of the gas inlet distributor shell is aligned with the raw material gas inlet pipe, the uniform gas distribution disc is movably sleeved in the inside of the bottom of the gas inlet distributor shell, and a sealing ring and a bearing with high temperature resistance are sleeved and arranged at the sleeving position between the uniform gas distribution disc and the gas inlet distributor shell, the top of the uniform gas distribution disc is provided with a linkage mechanism, and the input structure of the linkage mechanism can penetrate through the corresponding raw material gas inlet pipe and is drivingly connected with the meshing transmission mechanism arranged on the surface of the assembled box body.

[0011] Preferably, the linkage mechanism comprises a transmission shaft and a bevel gear box, the output end of the bevel gear box is drivingly connected with one end of the transmission shaft, the other end of the transmission shaft is fixed on the middle part of the top surface of the uniform gas distribution disc, the input end of the bevel gear box penetrates through the sidewall of the corresponding raw material gas inlet pipe and extends to the outside of the raw material gas inlet pipe, and a sealing ring and a bearing with high temperature resistance are also sleeved and arranged at the sleeving position between the input end of the bevel gear box and the raw material gas inlet pipe.

[0012] Preferably, a heat insulation shell is sleeved at the outside of the bevel gear box, a support plate is arranged between the surface of the heat insulation shell and the inner wall of the gas inlet distributor shell, and the top and bottom of the heat insulation shell are both arranged as tapered structures.

[0013] Preferably, the meshing transmission mechanism comprises a servo motor, a first gear and a second gear, the first gear is sleeved on the end of the bevel gear box input end and is in meshing transmission with the second gear, the output end of the servo motor is in transmission connection with the middle part of the second gear, and the servo motor drives the second gear to mesh with the first gear, so that the bevel gear box and the transmission shaft rotate to drive the uniform gas distribution disc to rotate synchronously.

[0014] Preferably, the ring groove is arranged in the outer ring structure of the bottom of the air inlet distributor shell, and two auxiliary pipes in communication with the space thereof are fixedly sleeved on the two sides of the ring groove, one end of each of the two auxiliary pipes penetrates through the corresponding assembly box and extends to the top outside of the corresponding assembly box, and the other end of each of the two auxiliary pipes is provided with an adjusting valve, and the ports of the other ends of the two auxiliary pipes are connected with a T-shaped guide pipe, a cleaning support plate is fixed on the inner wall of the bottom of the air inlet distributor shell, and a plurality of refractory ceramic fiber strips are arranged and installed on the surface of the bottom of the cleaning support plate, and a filter screen is nested in the top of each of the plurality of first air outlet holes and the plurality of second air outlet holes.

[0015] The present application has the following advantages:

[0016] 1、The air inlet distributor shell, the uniform gas distribution disc, the plurality of first air outlet holes, the plurality of second air outlet holes, the linkage mechanism and the meshing transmission mechanism are arranged to form a multifunctional air inlet distributor, which can fully ensure the uniform distribution of raw gas by using the porous structure and rotary centrifugal diffusion in the subsequent use process of the ammonia reactor body, thereby ensuring the sufficient contact of the catalyst in the plurality of heat exchange pipes with the raw gas and improving the reaction efficiency and the utilization rate of the catalyst.

[0017] 2、The device has better protection, that is, the operating temperature of the two assembly boxes is reduced by the refractory material, the thermal damage of the high temperature to the two assembly boxes is reduced, and the service life of the overall device is prolonged.

[0018] 3、The heat exchange efficiency of the present application is higher, the plurality of first baffles and the plurality of second baffles arranged in the reactor cylinder can significantly improve the turbulence degree of the heat conduction medium in the reactor cylinder, thereby effectively improving the heat exchange efficiency in the shell side, which is beneficial to the heat recovery and utilization in the reaction process and reduces the energy consumption.

[0019] 4、The temperature monitoring of the present application is more accurate, that is, the temperature monitoring points of the plurality of thermocouples arranged in the temperature measuring sleeve can accurately monitor the temperature of the catalyst bed, and provide accurate data support for the temperature control of the reaction. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a sectional view of the structure of the present application.

[0021] Figure 2 This is a cross-sectional schematic diagram of the transition structure in the present invention;

[0022] Figure 3 This is a top view of the heat exchange tube in the structure of the present invention;

[0023] Figure 4 This is a cross-sectional schematic diagram of the intake distributor housing in the structure of the present invention;

[0024] Figure 5 This is a three-dimensional schematic diagram of the intake distributor housing in the structure of the present invention;

[0025] Figure 6 This is a rear view schematic diagram of the intake distributor housing in the structure of the present invention;

[0026] Figure 7 This is a bottom view of the uniform air distribution plate in the structure of the present invention;

[0027] Figure 8 This is a front view schematic diagram of the cleaning support plate in the structure of the present invention;

[0028] Figure 9 This is a bottom view of the filter screen in the structure of the present invention;

[0029] Figure 10 In the structure of this invention Figure 8 Enlarged diagram of point A in the middle.

[0030] In the diagram: 1. Reactor gas outlet pipe; 2. Refractory material; 3. Anchoring pin; 4. Lower tube sheet; 5. Heat transfer medium outlet; 6. First baffle plate; 7. Second baffle plate; 8. Heat exchanger tube; 9. Reactor shell; 10. Upper tube sheet; 11. Assembly box; 12. Temperature measuring sleeve; 13. Pressure measuring tube; 14. Raw material gas inlet pipe; 15. Heat transfer medium inlet pipe; 16. Catalyst; 17. Lug support; 18. Temperature measuring tube; 19. Gas inlet distributor. 20. Housing; 21. Uniform gas distribution plate; 22. First gas outlet; 23. Second gas outlet; 24. Drive shaft; 25. Bevel gearbox; 26. Heat insulation housing; 27. Servo motor; 28. First gear; 29. ​​Second gear; 30. Auxiliary pipe; 31. T-shaped lead pipe; 32. Filter screen; 33. Cleaning support plate; 34. Refractory ceramic fiber strip; 35. Catalyst support; 36. Ceramic fiber paper; 37. Ceramic sleeve; 38. Refractory material protective plate. Detailed Implementation

[0031] The technical solution of the present invention will now be clearly and completely described in conjunction with preferred embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] like Figures 1-7 A novel ammonia reactor for green ammonia preparation includes an ammonia reactor body. The reactor body has an internal heat exchange space containing several heat exchange tubes 8 filled with catalyst 16. The heat exchange tubes 8 are made of stainless steel, and a supporting stainless steel grid is fitted around each heat exchange tube 8. The catalyst 16 is an iron-based catalyst. A temperature measuring sleeve 12 extending to the top of the ammonia reactor body is fitted inside one of the heat exchange tubes 8. Several thermocouple temperature measuring points are arranged from top to bottom inside the temperature measuring sleeve 12, specifically three thermocouple temperature measuring points. The interval between the three thermocouple temperature measuring points can be 0.5m, 1.5m, or 2.5m, thereby allowing real-time monitoring of the temperature at different heights of the catalyst bed. An air inlet distributor is fitted inside the top of the ammonia reactor body, pointing towards the top port of the heat exchange tube 8.

[0033] The ammonia reactor body includes a reactor cylinder 9. An upper tube sheet 10 and a lower tube sheet 4 are fixed to the top and bottom of the reactor cylinder 9, respectively. Assembly boxes 11 are fixedly installed on the top of the upper tube sheet 10 and the bottom of the lower tube sheet 4. The lower tube sheet 4, upper tube sheet 10, and the two assembly boxes 11 are all made of high-temperature resistant, high-strength Cr-Mo steel, thus capable of withstanding large pressure and temperature differences. The inner wall of the assembly box 11 is lined with refractory material 2 and anchoring nails 3, with the anchoring nails 3 nested inside the refractory material 2. The refractory material 2 is specifically made of high-temperature resistant corundum castable. The two ends of the heat exchange tubes 8 extend into the two assembly boxes 11 and are fitted inside. A reaction gas outlet pipe 1 is provided at the bottom of one assembly box 11, and the other assembly box 11... The reactor body 9 is equipped with a raw material gas inlet pipe 14 and a pressure measuring pipe 13 at the top. The heat exchange space is located inside the reactor body 9. A heat transfer medium inlet pipe 15 and a temperature measuring pipe 18 are respectively installed at the top and bottom of one side of the reactor body 9. A heat transfer medium outlet 5 is installed at the bottom of the other side of the reactor body 9. Several first baffles 6 and several second baffles 7 are alternately installed inside the reactor body 9 from top to bottom. Both the first baffles 6 and the second baffles 7 are made of carbon steel. The distance between adjacent first baffles 6 and second baffles 7 is specifically set to 400mm, which can significantly improve the turbulence of the heat transfer medium inside the reactor body 9 and enhance the heat exchange effect. Both sides of the bottom of the reactor body 9 are fixed with lug supports 17.

[0034] The gas distributor includes a gas distributor housing 19 fitted inside the top of the ammonia reactor body. A uniform gas distribution plate 20 is fitted inside the bottom of the gas distributor housing 19. The inner and outer ring structures of the uniform gas distribution plate 20 are respectively provided with a number of first gas outlet holes 21 and a number of second gas outlet holes 22. Both the first gas outlet holes 21 and the second gas outlet holes 22 are set as conical holes with a smaller top and a larger bottom. The diameter of the top port of the first gas outlet hole 21 is smaller than the diameter of the top port of the second gas outlet hole 22.

[0035] A transition structure is provided at the fitting point between the bottom end of the heat exchange tube 8 and the lower tube sheet 4. The transition structure includes a catalyst support 34 inside the bottom end of the heat exchange tube 8, and a ceramic sleeve 36 that penetrates the corresponding refractory material 2 is fixedly nested inside the bottom port of the heat exchange tube 8. Ceramic fiber paper 35 is nested at the fitting point between the ceramic sleeve 36 and the bottom port of the heat exchange tube 8. A refractory material protective plate 37 is nested at the connection point between the surface of the refractory material 2 and the corresponding lower tube sheet 4.

[0036] In use, the raw material gas enters the air distributor housing 19 through the corresponding assembly box 11 of the raw material gas inlet pipe 14. After passing through the distribution effect of multiple first air outlets 21 and multiple second air outlets 22 inside the uniform air distribution plate 20, the raw material gas is evenly distributed and then enters the interior of multiple heat exchange tubes 8. Inside the heat exchange tubes, the raw material gas undergoes an ammonia synthesis reaction under the action of the catalyst 16. At the same time, the heat transfer medium enters the heat exchange space through the heat transfer medium inlet pipe 15 and, under the action of multiple first baffles 6 and multiple second baffles 7, fully exchanges heat with the reaction system inside the heat exchange tubes 8. That is, during the reaction stage, it removes the heat generated by the reaction, and during the start-up stage, it provides the heat required for the reaction.

[0037] During the specific reaction process, the three thermocouple temperature monitoring points in the temperature measuring sleeve 12 can monitor the temperature of the catalyst 16 in real time in the heat exchange tube 8, and then link with the existing control system to monitor various reaction parameters in real time, and adjust the flow rate of the heat transfer medium and the flow rate of the feed gas in a timely manner according to the monitoring data to ensure the stable progress of the reaction. The ammonia generated thereafter is discharged into the designated container for collection through the reaction gas outlet pipe 1 and the corresponding assembly box 11.

[0038] Furthermore, to facilitate the operation of the entire device, the control system used in conjunction includes sensors, controllers, and actuators. The sensors are used to monitor parameters such as molten salt temperature, flow rate, and feed gas temperature and pressure in real time. The controller adopts a PLC control system, which controls the heat transfer medium flow regulating valve, feed gas flow regulating valve, etc. through the actuators based on the monitoring data transmitted by the sensors, so as to realize the real-time adjustment of reaction conditions.

[0039] like Figures 1-7The top port of the air intake distributor housing 19 is fitted inside the middle of the assembly box 11 set on the top of the upper tube plate 10, and the top port of the air intake distributor housing 19 is aligned with the raw material gas inlet pipe 14. The uniform air distribution plate 20 is movably fitted inside the bottom of the air intake distributor housing 19, and a high-temperature resistant sealing ring and bearing are nested at the fitting point between the uniform air distribution plate 20 and the air intake distributor housing 19, thereby fully improving the sealing effect of the connection between the uniform air distribution plate 20 and the air intake distributor housing 19. The top of the uniform air distribution plate 20 is provided with a linkage mechanism, and the input structure of the linkage mechanism can pass through the corresponding raw material gas inlet pipe 14 and be connected to the meshing transmission mechanism installed on the surface of the assembly box 11.

[0040] The linkage mechanism includes a drive shaft 23 and a bevel gearbox 24. The output end of the bevel gearbox 24 is connected to one end of the drive shaft 23, and the other end of the drive shaft 23 is fixed on the middle of the top surface of the uniform gas distribution plate 20. The input end of the bevel gearbox 24 passes through the side wall of the corresponding raw material gas inlet pipe 14 and extends to the outside of the raw material gas inlet pipe 14. The input end of the bevel gearbox 24 and the fitting part of the raw material gas inlet pipe 14 are also fitted with a sealing ring and bearing with high temperature resistance, thereby fully improving the sealing effect of the connection between the bevel gearbox 24 and the raw material gas inlet pipe 14.

[0041] The outer side of the bevel gearbox 24 is fitted with a heat insulation shell 25, and a support plate is installed between the surface of the heat insulation shell 25 and the inner wall of the air inlet distributor shell 19. The top and bottom of the heat insulation shell 25 are both set with a conical structure to reduce the resistance to the raw material gas entering the air inlet distributor shell 19 and to protect the bevel gearbox 24 from heat. The meshing transmission mechanism includes a servo motor 26, a first gear 27 and a second gear 28. The first gear 27 is fitted on the end of the input end of the bevel gearbox 24 and meshes with the second gear 28. The output end of the servo motor 26 is connected to the middle of the second gear 28 for transmission, and the servo motor 26 drives the second gear 28 to mesh with the first gear 27, so that the bevel gearbox 24 and the transmission shaft 23 rotate, driving the uniform air distribution plate 20 to rotate synchronously, thereby meeting the needs of subsequent automated operation.

[0042] In use, to improve the uniformity of the delivered raw gas, the intake distributor housing 19 and the uniform distribution plate 20 form an adjustable hardware channel. When the raw gas enters the intake distributor housing 19 through the raw gas inlet pipe 14 and the corresponding assembly box 11, the servo motor 26 is started synchronously. The output end of the servo motor 26 drives the second gear 28 to mesh with the first gear 27. Then, the first gear 27 outputs rotational power to the bevel gear box 24, which in turn drives the uniform distribution plate 20 to rotate synchronously through the transmission shaft 23. After the uniform distribution plate 20 rotates, the intake distributor housing 19... The raw gas inside 9 will be subjected to a strong centrifugal force, which will drive the raw gas to move radially from the center of rotation to the outer periphery. This means that the gas pressure and density at the inlet of the second outlet 22 will be slightly higher than that at the second outlet 22, thereby achieving uniform output. Furthermore, the rotation of the uniform gas distribution plate 20 itself will cause the gas to mix strongly within the inlet distributor housing 19, forming a uniform flow field. This helps to eliminate static pressure unevenness, eddies, or flow dead zones that may occur in the non-rotating state, thereby providing more consistent inflow conditions for the first outlet 21 and the second outlet 22, further improving the effect of uniform output to the heat exchange tube 8.

[0043] like Figure 1 , Figures 8-10 The bottom outer ring structure of the air intake distributor housing 19 is provided with an annular groove, and auxiliary pipes 29 communicating with its own space are fixedly sleeved on both sides of the annular groove. One end of each auxiliary pipe 29 passes through the corresponding assembly box 11 and refractory material 2 and extends to the top outer side of the corresponding assembly box 11. The other end of each auxiliary pipe 29 is provided with a regulating valve, and the other end of each auxiliary pipe 29 is connected to a T-shaped lead pipe 30. A cleaning support plate 32 is fixed on the inner wall of the bottom of the air intake distributor housing 19, and several refractory ceramic fiber strips 33 are arranged on the bottom surface of the cleaning support plate 32. A filter screen 31 is nested in the top of several first air outlets 21 and the top of several second air outlets 22.

[0044] When using this equipment, considering special circumstances such as the initial trial operation of the ammonia reactor or a high impurity content in the feed gas, pretreatment of the feed gas is necessary to ensure smooth operation of the entire unit and obtain reliable data. The specific details are as follows:

[0045] When the raw gas enters the air distributor housing 19 through the raw gas inlet pipe 14 and the corresponding assembly box 11, the servo motor 26 is started synchronously, so that the output end of the servo motor 26 drives the second gear 28 to mesh with the first gear 27. Then, the first gear 27 outputs rotational power to the bevel gear box 24, which in turn drives the uniform gas distribution plate 20 to rotate synchronously through the transmission shaft 23. After the uniform gas distribution plate 20 rotates, the raw gas inside the air distributor housing 19 will be subjected to a strong centrifugal force. This centrifugal force will drive the raw gas to move radially from the center of rotation to the outer periphery. This means that the gas pressure and density at the inlet of the second outlet 22 will be slightly higher than that at the second outlet 22, thereby achieving uniform output.

[0046] Meanwhile, due to the combined action of the filter screen 31 and the centrifugal force of the uniform gas distribution plate 20, impurities in the raw material gas will be concentrated and discharged into the annular groove at the bottom of the air inlet distributor housing 19. Subsequently, during the intermittent use of the entire device, the existing vacuum cleaner is connected to the end of the T-shaped inlet pipe 30, and then the valves inside the two auxiliary pipes 29 and the vacuum cleaner are opened. The vacuum cleaner is used to clean the impurities temporarily stored in the annular groove through the T-shaped inlet pipe 30 and the two auxiliary pipes 29, thereby maintaining the continuous use of the air inlet distributor housing 19 and improving the cleanliness of the raw material gas, ensuring the production effect of the subsequent reaction.

[0047] Furthermore, for the continuous use of the filter screen 31, during the rotation of the uniform air distribution plate 20, the filter screen 31 will repeatedly contact the multiple refractory ceramic fiber strips 33 at the bottom of the cleaning support plate 32, thereby producing a cleaning effect and ensuring the continuous and efficient filtration effect of the filter screen 31.

[0048] Although embodiments of the 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 invention. The invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A novel ammonia reactor for green ammonia preparation, comprising an ammonia reactor body, characterized in that: The ammonia reactor body has a heat exchange space inside, and several heat exchange tubes (8) filled with catalyst (16) are installed in the heat exchange space. A temperature measuring sleeve (12) extending to the top of the ammonia reactor body is installed in one of the heat exchange tubes (8), and several thermocouple temperature measuring points are arranged from top to bottom in the temperature measuring sleeve (12). The top of the ammonia reactor body is fitted with an air inlet distributor that outputs towards the top port of the heat exchange tube (8), and the air inlet distributor includes an air inlet distributor shell (19) fitted inside the top of the ammonia reactor body. The bottom of the air inlet distributor shell (19) is fitted with a uniform gas distribution plate (20), and the inner ring structure and outer ring structure of the uniform gas distribution plate (20) are respectively provided with a number of first gas outlet holes (21) and a number of second gas outlet holes (22).

2. The novel ammonia reactor for green ammonia preparation according to claim 1, characterized in that: The ammonia reactor body includes a reactor cylinder (9). An upper tube sheet (10) and a lower tube sheet (4) are fixed to the top and bottom of the reactor cylinder (9), respectively. An assembly box (11) is fixedly installed on the top of the upper tube sheet (10) and the bottom of the lower tube sheet (4). The inner wall of the assembly box (11) is provided with refractory material (2) and anchor nails (3). The anchor nails (3) are nested inside the refractory material (2). The two ends of the heat exchange tube (8) extend into the two assembly boxes (11) respectively. A reaction gas outlet pipe (1) is provided at the bottom of one assembly box (11), and a raw material gas inlet pipe (14) and a pressure measuring pipe (13) are provided at the top of the other assembly box (11).

3. The novel ammonia reactor for green ammonia preparation according to claim 2, characterized in that: The heat exchange space is located inside the reactor shell (9). A heat transfer medium inlet pipe (15) and a temperature measuring pipe (18) are respectively provided on the top and bottom of one side of the reactor shell (9), and a heat transfer medium outlet (5) is provided on the bottom of the other side of the reactor shell (9). Several first baffles (6) and several second baffles (7) are alternately installed inside the reactor shell (9) from top to bottom, and ear-type supports (17) are fixed on both sides of the bottom of the reactor shell (9).

4. The novel ammonia reactor for green ammonia preparation according to claim 1, characterized in that: A transition structure is provided at the fitting point between the bottom end of the heat exchange tube (8) and the lower tube sheet (4). The transition structure includes a catalyst support (34) inside the bottom end of the heat exchange tube (8), and a ceramic sleeve (36) penetrating the corresponding refractory material (2) is fixedly nested inside the bottom port of the heat exchange tube (8). Ceramic fiber paper (35) is nested at the fitting point between the ceramic sleeve (36) and the bottom port of the heat exchange tube (8). A refractory material protective plate (37) is nested at the connection point between the surface of the refractory material (2) and the corresponding lower tube sheet (4).

5. A novel ammonia reactor for preparing green ammonia according to claim 1, characterized in that: Both the first vent (21) and the second vent (22) are set as tapered holes with a smaller top and a larger bottom, and the diameter of the top port of the first vent (21) is smaller than the diameter of the top port of the second vent (22).

6. The novel ammonia reactor for green ammonia preparation according to claim 1, characterized in that: The top port of the air inlet distributor housing (19) is fitted inside the middle of the assembly box (11) set on the top of the upper tube plate (10), and the top port of the air inlet distributor housing (19) is aligned with the raw material gas inlet pipe (14). The uniform air distribution plate (20) is movably fitted inside the bottom of the air inlet distributor housing (19), and a high-temperature resistant sealing ring and bearing are nested at the fitting point between the uniform air distribution plate (20) and the air inlet distributor housing (19). The top of the uniform air distribution plate (20) is provided with a linkage mechanism, and the input structure of the linkage mechanism can pass through the corresponding raw material gas inlet pipe (14) and be connected to the meshing transmission mechanism installed on the surface of the assembly box (11).

7. A novel ammonia reactor for preparing green ammonia according to claim 6, characterized in that: The linkage mechanism includes a drive shaft (23) and a bevel gearbox (24). The output end of the bevel gearbox (24) is connected to one end of the drive shaft (23), and the other end of the drive shaft (23) is fixed on the middle of the top surface of the uniform gas distribution plate (20). The input end of the bevel gearbox (24) passes through the side wall of the corresponding raw material gas inlet pipe (14) and extends to the outside of the raw material gas inlet pipe (14). The input end of the bevel gearbox (24) and the fitting part of the raw material gas inlet pipe (14) are also fitted with a sealing ring and bearing with high temperature resistance.

8. A novel ammonia reactor for preparing green ammonia according to claim 7, characterized in that: The outer side of the bevel gearbox (24) is fitted with a heat insulation shell (25), and a support plate is installed between the surface of the heat insulation shell (25) and the inner wall of the air intake distributor shell (19). The top and bottom of the heat insulation shell (25) are both set as conical structures.

9. A novel ammonia reactor for preparing green ammonia according to claim 6, characterized in that: The meshing transmission mechanism includes a servo motor (26), a first gear (27), and a second gear (28). The first gear (27) is mounted on the end of the input end of the bevel gearbox (24) and meshes with the second gear (28). The output end of the servo motor (26) is connected to the middle of the second gear (28) for transmission. The servo motor (26) drives the second gear (28) to mesh with the first gear (27), so that the bevel gearbox (24) and the transmission shaft (23) rotate, driving the uniform air distribution plate (20) to rotate synchronously.

10. A novel ammonia reactor for preparing green ammonia according to claim 1, characterized in that: The bottom outer ring structure of the air inlet distributor housing (19) is provided with an annular groove, and both sides of the annular groove are fixedly sleeved with auxiliary pipes (29) communicating with its own space. One end of each of the two auxiliary pipes (29) passes through the corresponding assembly box (11) and refractory material (2) and extends to the top outer side of the corresponding assembly box (11). The other end of each of the two auxiliary pipes (29) is provided with a regulating valve, and the other end of each of the two auxiliary pipes (29) is connected to a T-shaped lead pipe (30). A cleaning support plate (32) is fixed on the inner wall of the bottom of the air inlet distributor housing (19), and several refractory ceramic fiber strips (33) are arranged on the bottom surface of the cleaning support plate (32). A filter screen (31) is nested in the top of several first air outlets (21) and the top of several second air outlets (22).

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