Device and method for separating and purifying ammonia decomposition products

Abstract

The invention relates to an ammonia decomposition product separation and purification device and method, and relates to the technical field of ammonia processing. Comprising a purification kettle which is internally divided into a purification area and a high-temperature treatment area, the purification device is arranged in the purification area in the purification kettle and comprises a mounting frame, and a molecular sieve adsorption plate for adsorbing impurities is slidably mounted in the mounting frame in the height direction; a cleaning part for performing high-speed vibration on the molecular sieve adsorption plate is also mounted in the high-temperature treatment area of the purification kettle; the invention can solve the following problems in the prior art: firstly, an existing device ensures the adsorption performance of a molecular sieve adsorption plate through a high-temperature heating regeneration mode, but in the high-temperature heating regeneration process, some impurities are adsorbed on the surface of the molecular sieve adsorption plate and are difficult to clean only through high temperature; and secondly, the hydrogen purification effect is improved in a layer-by-layer purification mode in the prior art, but the efficiency of mixed gas penetrating through a molecular sieve adsorption plate is slowed down, so that the purification efficiency is influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of ammonia processing, and in particular to a device and method for separating and purifying ammonia decomposition products. Background Art

[0002] The ammonia decomposition product separation and purification device is a device used to decompose liquid ammonia into hydrogen and nitrogen and remove impurities through a purification device. The core is to generate a hydrogen-nitrogen mixed gas by catalytic decomposition of liquid ammonia, and then remove residual ammonia and moisture through adsorption technology to finally obtain high-purity gas.

[0003] For example, a Chinese patent with publication number CN119215606A discloses a hydrogen purification device, including an outer cylinder, a partition plate is connected to the middle of the inner cavity of the outer cylinder, and the partition plate is symmetrically provided with a primary purification module above and below. The moisture and carbon monoxide in the gas are removed by the tertiary purification module and the secondary purification module respectively, and the carbon dioxide mixed in the hydrogen is removed by the primary purification module, thereby realizing the purification of hydrogen, and the purification efficiency of hydrogen is monitored. When alumina, zeolite and activated carbon reach adsorption saturation, the resistance encountered by the gas passing through alumina, zeolite and activated carbon becomes larger, thereby reducing the rate at which the gas passes through, and is monitored by a gas flow sensor. When the gas flow decreases, another group of primary purification modules, secondary purification modules and tertiary purification modules are switched respectively, and the used alumina, zeolite and activated carbon are subjected to high-temperature heating and regeneration to ensure the continuous operation of the device and the hydrogen purification effect.

[0004] However, the above device still has some shortcomings in actual use:

[0005] 1. First, the existing device ensures the adsorption performance of alumina, zeolite and activated carbon by high-temperature heating regeneration. However, during the high-temperature heating regeneration process, some impurities are adsorbed on the surface of alumina, zeolite and activated carbon and are difficult to clean. Therefore, it is difficult to ensure that alumina, zeolite and activated carbon are restored to their optimal adsorption state only by high-temperature heating regeneration.

[0006] 2. Secondly, in the prior art, hydrogen is purified by a primary purification module, a tertiary purification module and a secondary purification module. The multi-stage module can effectively improve the effect of hydrogen purification, but at the same time it will cause hydrogen to pass through multiple layers of barriers, thus causing its purification efficiency to deteriorate.

[0007] Therefore, under the above-stated viewpoint, there is still room for improvement in the existing devices. Summary of the invention

[0008] In order to solve the above problems, the present invention provides a device and method for separating and purifying ammonia decomposition products, which adopts the following technical solutions:

[0009] In a first aspect, the present application provides an ammonia decomposition product separation and purification device, including a purification kettle for purifying the products obtained from ammonia decomposition; and the purification kettle is divided into two vertically distributed purification zones and a high-temperature treatment zone.

[0010] The purification device is arranged in the purification zone of the purification kettle. The purification device includes four groups of mounting frames slidably installed at equal intervals along the horizontal direction in the purification kettle. Four groups of fixed columns are symmetrically installed in the purification device. Four groups of molecular sieve adsorption plates are slidably installed along the height direction in the four groups of mounting frames, and the four groups of mounting frames also slidably penetrate through the four corresponding fixed columns.

[0011] The regeneration device is arranged in the high-temperature treatment zone of the purification kettle, and the regeneration device includes a heating frame installed on the inner wall of the purification kettle. A cleaning component for vibrating the molecular sieve adsorption plate at a high speed is also installed in the high-temperature treatment zone of the purification kettle.

[0012] Preferably, air inlet pipes and air outlet pipes are symmetrically installed on both sides of the purification kettle. The air inlet pipes transport the product gas obtained from ammonia decomposition into the purification kettle, and the air outlet pipes transport the gas that has been processed by the purification device outwards.

[0013] Preferably, the mounting frame includes a U-shaped plate and a clamping plate. The U-shaped plate is slidably installed in the purification kettle along the height direction of the purification kettle, and a strip-shaped groove for the U-shaped plate to slide is also opened in the middle of the purification kettle. Clamping plates are symmetrically hinged and installed on both sides of the U-shaped plate, and an installation area for inserting and installing the molecular sieve adsorption plate is provided between the clamping plates.

[0014] Preferably, two electric push rods are installed at the bottom of the purification kettle. The output ends of the two electric push rods are vertically distributed. Connecting rods are installed on the output ends of the electric push rods, and each connecting rod is connected to two adjacent U-shaped plates among the four groups of U-shaped plates.

[0015] Preferably, the cleaning component includes two telescopic connecting shafts rotatably installed on the inner wall of the purification kettle. A cleaning motor is installed on one side of the telescopic connecting shaft. Synchronous belts are sleeved on the ends of the two telescopic connecting shafts close to the cleaning motor. Cams are installed at the ends of the telescopic connecting shafts far from the cleaning motor, and linkage components are also arranged at the ends of the telescopic connecting shafts close to the cams.

[0016] Preferably, the linkage component includes a vertical right-angle plate installed inside the purification kettle along its height direction, the horizontal end of the vertical right-angle plate is connected to the inner wall of the purification kettle with a linkage compression spring, one side of the vertical right-angle plate is meshed with a linkage gear, one side of the linkage gear is also meshed with a horizontal right-angle plate, one end of the horizontal right-angle plate is installed with a linkage rope, the side of the linkage rope away from the horizontal right-angle plate is installed with a linkage control plate, the linkage control plate is installed at one end of the telescopic connecting shaft close to the cam, and a rotating hole for the telescopic connecting shaft to rotate is provided on the linkage control plate.

[0017] A plurality of rotating wheels are installed at the bottom of the purification kettle, the linkage rope sleeve is arranged on the rotating wheel, and a control spring is connected between the linkage control plate and the inner wall of the purification kettle.

[0018] Preferably, a plurality of mounting grooves for taking out the molecular sieve adsorption plates are provided on the top of the purification kettle, and covers are provided on the mounting grooves.

[0019] Preferably, a control component for controlling the inclination of the molecular sieve adsorption plate is also installed in the purification kettle, and the control component includes a V-shaped control rod, which is rotatably installed on the inner wall of the purification kettle through a torsion spring, one end of the V-shaped control rod abuts against a horizontal right-angle plate, and the other end of the V-shaped control rod abuts against the molecular sieve adsorption plate.

[0020] Preferably, the molecular sieve adsorption plate is filled with a plurality of alumina and zeolite.

[0021] In a second aspect, the present application also provides a process for separating and purifying an ammonia decomposition product, and the process for separating and purifying an ammonia decomposition product is as follows:

[0022] S1. Ammonia decomposition: Liquid ammonia is heated and vaporized in a vaporizer, and then enters a decomposition furnace for catalytic cracking to generate hydrogen and nitrogen;

[0023] S2, gas cooling: The high-temperature mixed gas is cooled by heat exchange with the raw ammonia through a heat exchanger, and then further cooled to room temperature through a water cooler;

[0024] S3, adsorption purification: the mixed gas enters the interior of the purification kettle, and then is purified by the purification device, and the molecular sieve adsorption plate in the purification device adsorbs water and residual ammonia in the mixed gas;

[0025] S4, auxiliary regeneration: after the molecular sieve adsorption plate works for a long time, its adsorption performance gradually decreases, so the molecular sieve adsorption plate is treated by a regeneration device to ensure that the molecular sieve adsorption plate is restored to its optimal adsorption performance;

[0026] S5. Circulation operation: After the molecular sieve adsorption plate is circulated and regenerated, it is convenient to carry out uninterrupted purification operation on the mixed gas.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. The present invention integrates the purification of the mixed gas and the regeneration of the molecular sieve adsorption plate required for purification into the purification kettle, which can greatly ensure the continuity of the purification of the mixed gas and effectively improve the efficiency of the purification of the mixed gas; and the molecular sieve adsorption plate can be regenerated alternately, greatly improving its service life.

[0029] 2. The cleaning component of the present invention can perform a tapping treatment on the molecular sieve adsorption plate while performing high-temperature regeneration, and the molecular sieve adsorption plate is tapped at a high frequency in an inclined state, which can greatly improve the desorption efficiency of the water adsorbed in the molecular sieve adsorption plate, and the solid impurities collected in the mixed gas can also be quickly separated from the molecular sieve adsorption plate by vibration and tapping, ensuring that the molecular sieve adsorption plate is always in the best adsorption performance, thereby greatly improving the service life of the molecular sieve adsorption plate.

[0030] 3. The air duct assembly of the present invention can adjust the flow rate of the mixed gas in the purification kettle, and control the efficiency and effect of the mixed gas purification by controlling the flow rate of the mixed gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0032] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0033] Figure 2 It is a schematic diagram of the structure between the purification device and the regeneration device of the present invention.

[0034] Figure 3 It is a schematic structural diagram of the purification device of the present invention from a first perspective.

[0035] Figure 4 It is a schematic structural diagram of the purification device of the present invention from a second viewing angle.

[0036] Figure 5 It is a structural schematic diagram of the installation frame of the present invention.

[0037] Figure 6 It is a schematic structural diagram of the regeneration device of the present invention.

[0038] Figure 7 It is a structural schematic diagram of the regeneration device, linkage components and cleaning components of the present invention.

[0039] Figure 8 It is a structural schematic diagram between the linkage components and the cleaning components of the present invention.

[0040] Fig. 9 It is a schematic structural diagram of the air duct assembly of the present invention from a first perspective.

[0041] Fig.10 It is a schematic structural diagram of the second perspective of the air duct assembly of the present invention.

[0042] Fig.11 It is a schematic structural diagram of the third perspective of the air duct assembly of the present invention.

[0043] Fig.12 It is a flow chart of the method for separating and purifying ammonia decomposition products of the present invention.

[0044] Explanation of reference numerals: 1, purification kettle; 10, purification area; 11, high-temperature treatment area; 2, purification device; 20, installation frame; 21, fixed column; 22, molecular sieve adsorption plate; 3, regeneration device; 30, heating frame; 31, cleaning component; 12, intake pipe; 13, outlet pipe; 200, C-shaped plate; 201, clamping plate; 4, electric push rod; 40, connecting rod; 310, telescopic connecting shaft; 311, cleaning motor; 312, synchronous belt; 313, cam; 32, linkage component; 320, vertical right-angle plate; 321, linkage compression spring; 322, linkage gear; 323, horizontal right-angle plate; 324, linkage rope; 325, linkage control plate; 326, runner; 327, control spring; 14, cover plate; 15, installation groove; 5, control component; 50, V-shaped control rod; 6, air duct assembly; 60, air duct plate; 61, deformation sealing sheet; 62, adjusting column; 63, adjusting groove; 64, sealing plate. Detailed implementation manners

[0045] The following is a further detailed description of the present application in conjunction with the attached Figure 1-Figure 12 drawings.

[0046] The embodiment of the present application discloses an ammonia decomposition product separation and purification device and method, which are mainly applied in the process of ammonia decomposition.

[0047] First of all, the existing device uses the method of high-temperature heating regeneration to ensure the adsorption performance of alumina, zeolite and activated carbon required for the purification of ammonia decomposition products. However, during the high-temperature heating regeneration process, some impurities are adsorbed on the surfaces of alumina, zeolite and activated carbon and are difficult to clean. Therefore, it is difficult to ensure that alumina, zeolite and activated carbon return to their optimal adsorption states only by the method of high-temperature heating regeneration.

[0048] Secondly, in the prior art, the method of multi-stage module layer-by-layer purification can effectively improve the purification effect of hydrogen, but at the same time, it will cause hydrogen to pass through multiple barriers, resulting in a poor purification efficiency.

[0049] Embodiment 1:

[0050] Refer to Figure 1 and Figure 2As shown, an ammonia decomposition product separation and purification device includes a purification kettle 1 for purifying the product obtained by ammonia decomposition; and the purification kettle 1 is divided into two purification areas 10 and a high-temperature treatment area 11 distributed up and down; the purification area 10 is isolated from the high-temperature treatment area 11.

[0051] Ammonia decomposes into hydrogen (H) under the action of high temperature (800-850℃) and catalyst (such as nickel-based catalyst). 2 ) and nitrogen (N 2 ).

[0052] The hydrogen-nitrogen mixed gas after the decomposition of ammonia contains trace amounts of residual ammonia and water. In order to obtain high-purity hydrogen, it is necessary to further purify it through the molecular sieve adsorption plate 22 adsorption purification device 2.

[0053] The purification device 2 is arranged in the purification area 10 in the purification kettle 1. The purification device 2 includes four groups of installation frames 20 that are slidably installed at equal intervals in the horizontal direction in the purification kettle 1. Four groups of fixed columns 21 are also symmetrically installed in the purification device 2. Molecular sieve adsorption plates 22 are slidably installed in the four groups of installation frames 20 along the height direction, and the four groups of installation frames 20 are also slidably penetrated on four corresponding groups of fixed columns 21.

[0054] The molecular sieve adsorption plates 22 are mainly used to adsorb and purify trace residual ammonia and moisture contained in the hydrogen-nitrogen mixed gas. In the initial state, two groups of molecular sieve adsorption plates 22 are located in the purification area 10 of the purification kettle 1, and two groups of molecular sieve adsorption plates 22 are located in the high-temperature treatment area 11; each time the mixed gas is purified, two groups of molecular sieve adsorption plates 22 are always used to adsorb and purify it, and the four groups of molecular sieve adsorption plates 22 are composed of two groups of molecular sieve adsorption plates 22 as a unit, and the two units of molecular sieve adsorption plates 22 are used alternately to purify the mixed gas.

[0055] The molecular sieve adsorption plate 22 is lifted and lowered along the fixed column 21 , and the molecular sieve adsorption plate 22 is guided by the fixed column 21 to ensure the stability of the movement of the molecular sieve adsorption plate 22 .

[0056] The regeneration device 3 is arranged in the high temperature treatment zone 11 in the purification kettle 1, and the regeneration device 3 includes a heating frame 30 installed on the inner wall of the purification kettle 1. The high temperature treatment zone 11 of the purification kettle 1 is also equipped with a cleaning component 31 for high-speed vibration of the molecular sieve adsorption plate 22.

[0057] When the molecular sieve adsorption plates 22 are alternating, the two groups of molecular sieve adsorption plates 22 located in the high temperature treatment zone 11 are regenerated by the regeneration device 3 to prevent the molecular sieve adsorption plates 22 from being blocked by adsorbed moisture, ammonia and impurities, resulting in poor adsorption performance.

[0058] Look again Figure 2As shown in the figure, it is a schematic structural diagram of the mixed gas entering and exiting the purification kettle 1 in this application; specifically, intake pipes 12 and outlet pipes 13 are symmetrically installed on both sides of the purification kettle 1. The intake pipes 12 transport the product gas obtained from ammonia decomposition into the purification kettle 1, and the outlet pipes 13 transport the gas that has been processed by the purification device 2 outwards.

[0059] When it is necessary to purify the mixed gas, the equipment storing the mixed gas externally is connected to the intake pipe 12 of the purification kettle 1 in this application, and the equipment collecting the purified gas is connected to the outlet pipe 13 of the purification kettle 1 in this application.

[0060] During specific implementation, the mixed gas enters the purification kettle 1 through the intake pipe 12. After the mixed gas is purified by the purification kettle 1, it flows out through the outlet pipe 13.

[0061] And it should be noted that the equipment storing the mixed gas externally and the equipment collecting the purified gas are structures known in the prior art.

[0062] Refer to Figure 3 、 Figure 4 and Figure 5 As shown in the figure, the installation frame 20 includes a U-shaped plate 200 and clamping plates 201. The U-shaped plate 200 is slidably installed in the purification kettle 1 along the height direction of the purification kettle 1. A strip-shaped groove for the U-shaped plate 200 to slide is also opened in the middle of the purification kettle 1. Clamping plates 201 are symmetrically and hingedly installed on both sides of the U-shaped plate 200, and an installation area for inserting and installing the molecular sieve adsorption plate 22 is provided between the clamping plates 201.

[0063] A number of installation grooves 15 for taking out the molecular sieve adsorption plate 22 are opened at the top of the purification kettle 1, and a cover plate 14 is provided on the installation grooves 15.

[0064] In the initial state, the molecular sieve adsorption plate 22 is not installed between the clamping plates 201 of the installation frame 20. When it is necessary to purify the mixed gas, the cover plate 14 is opened, and the molecular sieve adsorption plate 22 corresponding to the gap is inserted into the U-shaped plate 200 from the installation groove 15 of the purification kettle 1 along the height direction of the purification kettle 1. And the molecular sieve adsorption plate 22 is clamped between the clamping plates 201 on the U-shaped plate 200, and the molecular sieve adsorption plate 22 is clamped by the clamping plates 201.

[0065] And it should be noted that the clamping plates 201 are hinged to the inner wall of the U-shaped plate 200, and a torsion spring is provided at the hinge, so that it has a certain damping. When an external force is applied to the clamping plates 201, it can rotate. After the external force applied to the clamping plates 201 is removed, the clamping plates 201 will automatically return to the vertical state.

[0066] When purifying the mixed gas, the mixed gas then enters the purification kettle 1 through the intake pipe 12. Then, under the action of pressure, the mixed gas sequentially passes through two molecular sieve adsorption plates 22 along the purification area 10 of the purification kettle 1, and is purified by the alumina, zeolite, and activated carbon inside the molecular sieve adsorption plates 22.

[0067] Alumina is a polar adsorbent mainly used for gas drying and dehydration. Its adsorption characteristics mainly depend on its high specific surface area and porosity, and it can effectively adsorb moisture and other polar molecules. The surface active centers of alumina are hydrocarbon groups and Lewis acids, with strong polar adsorption ability.

[0068] Zeolite is a silicate crystal with a highly ordered pore structure. Its porosity enables it to selectively adsorb specific molecules. Zeolite has a strong adsorption ability for polar molecules and unsaturated organic compounds, which makes it show excellent performance in gas purification. For example, in hydrogen purification, zeolite can effectively separate hydrogen from carbon monoxide. In addition, zeolite can also optimize its adsorption performance by adjusting the pore size and surface chemical properties.

[0069] Activated carbon is a porous carbonaceous substance with a highly developed pore structure and a large specific surface area. Its adsorption performance mainly depends on its porous structure and surface chemical groups, and it can come into full contact with gas molecules and adsorb them. Activated carbon has good adsorption ability for both organic and inorganic gases. In addition, its adsorption ability can be restored through regeneration treatment, thereby extending its service life.

[0070] After the two groups of molecular sieve adsorption plates 22 in the purification area 10 have adsorbed the mixed gas for a long time, their performance of adsorbing impurities significantly decreases. At this time, the two groups of molecular sieve adsorption plates 22 in the high-temperature treatment area 11 move upward to the purification area 10 in the purification kettle 1, while the molecular sieve adsorption plates 22 that have been used for a long time move downward to the high-temperature treatment area 11 of the purification kettle 1 for regeneration treatment; specifically, as follows:

[0071] Look again Figure 3 and Figure 4 As shown, two groups of electric push rods 4 are installed at the bottom of the purification kettle 1. The output ends of the two groups of electric push rods 4 are vertically distributed. Two connecting rods 40 are installed on the output ends of the electric push rods 4, and each connecting rod 40 is connected to two adjacent U-shaped plates 200 among the four U-shaped plates 200.

[0072] During specific implementation, the molecular sieve adsorption plates 22 are controlled to move up and down along the fixed column 21 by the electric push rods 4.

[0073] The electric push rod 4 on one side of the purification kettle 1 is started to control the two molecular sieve adsorption plates 22 with good performance connected at the upper end thereof by the connecting rod 40 to move upward to the purification area 10 of the purification kettle 1; after the molecular sieve adsorption plates 22 with good performance move to the specified position, the electric push rod 4 on the other side of the purification kettle 1 is started to control the two groups of molecular sieve adsorption plates 22 that have been working for a long time to move downward to the high-temperature treatment area 11 of the purification kettle 1 for regeneration treatment.

[0074] Reference Figure 6 and Figure 7 As shown, it is a structural schematic diagram of cleaning the molecular sieve adsorption plate 22 in the present application; specifically, the cleaning component 31 includes two telescopic connecting shafts 310 rotatably installed on the inner wall of the purification kettle 1, and a cleaning motor 311 is installed on one side of the telescopic connecting shaft 310. A synchronous belt 312 is sleeved on one end of the two telescopic connecting shafts 310 close to the cleaning motor 311, and a cam 313 is installed on the end of the telescopic connecting shaft 310 away from the cleaning motor 311. A linkage component 32 is also provided at the end of the telescopic connecting shaft 310 close to the cam 313.

[0075] When the molecular sieve adsorption plate 22 that has been working for a long time moves to the high-temperature treatment area 11 of the purification kettle 1, the cleaning motor 311 is started, and the cleaning motor 311 drives the telescopic connecting shaft 310 to rotate, and then the telescopic connecting shaft 310 controls the cam 313 to rotate, and the cam 313 performs high-speed knocking and vibration on the molecular sieve adsorption plate 22 that has been working for a long time, so that the molecular sieve adsorption plate 22 is regenerated at high temperature while shaking, thereby improving the regeneration efficiency of the molecular sieve adsorption plate 22 that has been working for a long time.

[0076] The heating frame 30 controls the temperature in the purification kettle 1 to ensure that the high temperature treatment area 11 of the purification kettle 1 is at a reasonable temperature for regenerating the molecular sieve adsorption plate 22. Under the control of high temperature, the water adsorbed in the molecular sieve adsorption plate 22 is quickly evaporated, and the alumina is calcined at high temperature (usually 500-800°C) to decompose and release the impurities adsorbed on the surface, thereby restoring its activity. Zeolite can effectively desorb adsorbed organic matter at high temperature (180-220°C) to achieve exhaust gas purification.

[0077] When activated carbon is heated to 100-150℃, water and low-boiling organic matter evaporate. When heated to 300-700℃, organic matter decomposes and forms carbonized residues. Activation stage: Heating to 700-1000℃, using water vapor or carbon dioxide and other gases to oxidize and decompose the carbonized residues, restoring the microporous structure and adsorption performance of activated carbon.

[0078] It should be noted that the high-temperature treatment area 11 of the purification kettle 1 is provided with multiple layers of heat-insulating tiles and a heat-insulating layer to ensure that heat accumulates in the high-temperature treatment area 11 of the purification kettle 1 and prevent heat from escaping. At the same time, the high-temperature treatment area 11 of the purification kettle 1 is isolated from the purification area 10 and they do not affect each other.

[0079] Refer to Figure 7 and Figure 8 As shown, it is a schematic structural diagram of the movement of the cam 313 in this application. The linkage component 32 includes a vertical right-angle plate 320 installed inside the purification kettle 1 along its height direction. A linkage compression spring 321 is connected between the horizontal end of the vertical right-angle plate 320 and the inner wall of the purification kettle 1. A linkage gear 322 is engaged on one side of the vertical right-angle plate 320. A horizontal right-angle plate 323 is also engaged on one side of the linkage gear 322. A linkage rope 324 is installed at one end of the horizontal right-angle plate 323. A linkage control plate 325 is installed on the side of the linkage rope 324 away from the horizontal right-angle plate 323. The linkage control plate 325 is installed at one end of the telescopic connecting shaft 310 close to the cam 313, and a rotation hole for the telescopic connecting shaft 310 to rotate is opened on the linkage control plate 325;

[0080] A number of rotating wheels 326 are installed at the bottom of the purification kettle 1. The linkage rope 324 is sleeved on the rotating wheels 326. A control spring 327 is connected between the linkage control plate 325 and the inner wall of the purification kettle 1.

[0081] In the initial state, the telescopic connecting shaft 310 is in a contracted state, and a spring is provided inside the telescopic connecting shaft 310 to ensure that the telescopic connecting shaft 310 can automatically reset; further, the telescopic part of the telescopic connecting shaft 310 is an uneven structure to ensure that the telescopic connecting shaft 310 is still always controlled by the cleaning motor 311 after telescoping.

[0082] During specific implementation, when the molecular sieve adsorption plate 22 that has been working for a long time moves downward, the corresponding U-shaped plate 200 presses down on the vertical right-angle plate 320 at the bottom of the purification kettle 1 and controls it to move downward. When the vertical right-angle plate 320 moves downward, it drives the linkage gear 322 to rotate. The linkage gear 322 controls the horizontal right-angle plate 323 to move. During the movement of the horizontal right-angle plate 323, it pulls the linkage rope 324, causing the linkage rope 324 to drive the linkage control plate 325 to move towards the middle of the purification kettle 1; at the same time, the linkage control plate 325 controls the cam 313 to move synchronously until the cam 313 moves between the two groups of molecular sieve adsorption plates 22 in the high-temperature treatment area 11 of the purification kettle 1. At this time, when the cam 313 rotates, the cam 313 can simultaneously strike the two groups of molecular sieve adsorption plates 22, thereby realizing the high-speed vibration of the molecular sieve adsorption plates 22. During the vibration process, moisture and some impurities are shaken off.

[0083] Furthermore, in order to improve the cleaning efficiency of the molecular sieve adsorption plate 22, the present application also proposes a V-shaped control rod 50, which can adjust the angle of the molecular sieve adsorption plate 22 to make it inclined. When the molecular sieve adsorption plate 22 is in an inclined state, the cam 313 knocks it to prevent the water droplets falling from the molecular sieve adsorption plate 22 from re-adhering to the molecular sieve adsorption plate 22. In the inclined state, the water droplets can directly fall to the bottom of the purification kettle 1; a control component 5 for controlling the inclination of the molecular sieve adsorption plate 22 is also installed in the purification kettle 1, and the control component 5 includes a V-shaped control rod 50, which is rotatably installed on the inner wall of the purification kettle 1 through a torsion spring, one end of the V-shaped control rod 50 abuts against the horizontal right-angle plate 323, and the other end of the V-shaped control rod 50 abuts against the molecular sieve adsorption plate 22.

[0084] When the molecular sieve adsorption plate 22 that has been working for a long time moves downward, the horizontal right-angle plate 323 squeezes one end of the V-shaped control rod 50. After receiving the pressure, one end of the V-shaped control rod 50 rotates around the hinge point, and the other end of the V-shaped control rod 50 approaches the molecular sieve adsorption plate 22 that is moving downward until it squeezes the molecular sieve adsorption plate 22, causing the molecular sieve adsorption plate 22 and the clamping plate 201 to rotate around the hinge point. After the molecular sieve adsorption plate 22 moves downward to the specified position, the molecular sieve adsorption plate 22 is in a tilted state.

[0085] When the molecular sieve adsorption plate 22 is in an inclined state, the cam 313 knocks it to prevent the water drops falling from the molecular sieve adsorption plate 22 from re-adhering to the molecular sieve adsorption plate 22. In the inclined state, the water drops can directly fall to the bottom of the purification kettle 1.

[0086] Embodiment 2:

[0087] Reference Fig. 9 , Fig.10 and Fig.11 As shown, on the basis of Example 1, in order to further ensure the efficiency of mixed gas purification, the present application also proposes an air duct assembly 6, which is used to change the flow velocity of the mixed gas inside the purification kettle 1, and the efficiency of mixed gas purification is improved by controlling its flow velocity; specifically, a plurality of air duct assemblies 6 are evenly installed in the purification area 10 in the purification kettle 1, and the air duct assembly 6 includes air duct plates 60 hinged in sequence head to tail, and deformable sealing sheets 61 are installed between the top and tail ends of the plurality of air duct plates 60, and adjusting columns 62 are installed at the hinges of the plurality of air duct plates 60, and the adjusting columns 62 are slidably penetrated through the top of the purification kettle 1, and an adjusting groove 63 for adjusting by the adjusting columns 62 is provided on the top of the purification kettle 1, and a sealing plate 64 is also installed on the adjusting column 62, and the sealing plate 64 abuts against the adjusting groove 63 of the purification kettle 1 to ensure that the adjusting groove 63 is always in a sealed state.

[0088] In the initial state, the plurality of air duct components 6 in the purification area 10 of the purification kettle 1 are in a straight parallel state, and at this time, the mixed gas flows in the purification kettle 1 at a uniform speed with a large flow rate.

[0089] The mixed gas flow rate has a significant impact on the adsorption of moisture and excess ammonia during its purification process. Increasing the inlet gas flow rate can improve the recovery rate of impurities, but too high a flow rate may lead to a decrease in the purification rate.

[0090] A plurality of adjusting columns 62 are controlled so that the adjusting columns 62 move along the adjusting grooves 63 of the purification kettle 1. When a plurality of air duct components 6 are in an "S" shape, after the mixed gas enters the purification kettle 1, the gas will flow along the "S"-shaped air duct component 6, so that the flow rate of the gas is reduced. At this time, the mixed gas flows in a soft state. After it passes through the molecular sieve adsorption plate 22, the recovery rate of impurities can be improved, ensuring a high purification rate of the mixed gas; when a plurality of air duct components 6 are in an "eight" shape, some air ducts are large and some are small, which will cause inconsistent flow speeds of the mixed gas, causing interference between the mixed gases in the purification kettle 1, resulting in reduced purification efficiency.

[0091] See also Fig.12 As shown, a process for separating and purifying ammonia decomposition products is shown below:

[0092] S1. Ammonia decomposition: Liquid ammonia is heated and vaporized in a vaporizer, and then enters a decomposition furnace for catalytic cracking to generate hydrogen and nitrogen.

[0093] S2. Gas cooling: The high-temperature mixed gas is cooled by heat exchange with the raw ammonia through a heat exchanger, and then further cooled to room temperature through a water cooler.

[0094] S3. Adsorption purification: When the mixed gas needs to be purified, the device for storing the mixed gas externally is connected to the air inlet pipe 12 of the purification kettle 1 in the present application, and the device for collecting the purified gas is connected to the air outlet pipe 13 of the purification kettle 1 in the present application. When the mixed gas is purified, the mixed gas then enters the purification kettle 1 through the air inlet pipe 12, and then the mixed gas passes through the two molecular sieve adsorption plates 22 in sequence along the purification area 10 of the purification kettle 1 under the action of pressure, and is purified by the alumina, zeolite and activated carbon in the molecular sieve adsorption plates 22.

[0095] S4. Auxiliary regeneration: After the two groups of molecular sieve adsorption plates 22 in the purification area 10 adsorb the mixed gas for a long time, their impurity adsorption performance is significantly reduced. At this time, the two groups of molecular sieve adsorption plates 22 located in the high-temperature treatment area 11 move upward to the purification area 10 in the purification kettle 1, and the molecular sieve adsorption plates 22 that have been used for a long time move downward to the high-temperature treatment area 11 of the purification kettle 1 for high-temperature regeneration treatment.

[0096] Furthermore, in order to improve the cleaning efficiency of the molecular sieve adsorption plate 22, when the molecular sieve adsorption plate 22 that has been working for a long time moves downward, the molecular sieve adsorption plate 22 is tilted. At this time, when the cam 313 rotates, the cam 313 can knock on two groups of molecular sieve adsorption plates 22 at the same time, thereby realizing high-speed vibration of the molecular sieve adsorption plate 22, which shakes off moisture and some impurities during the vibration process.

[0097] S5. Circulation operation: After the molecular sieve adsorption plate 22 is circulated and regenerated, it is convenient to perform uninterrupted purification operation on the mixed gas.

[0098] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An ammonia decomposition product separation and purification device, characterized in that: Including: A purification kettle (1) for purifying the products obtained from ammonia decomposition; And the inside of the purification kettle (1) is divided into two vertically distributed purification areas (10) and a high-temperature treatment area (11); A purification device (2) is arranged in the purification area (10) of the purification kettle (1). The purification device (2) includes four groups of mounting frames (20) slidably installed at equal intervals along the horizontal direction in the purification kettle (1). Four groups of fixed columns (21) are symmetrically installed in the purification device (2). Molecular sieve adsorption plates (22) are slidably installed along the height direction in the four groups of mounting frames (20), and the four groups of mounting frames (20) also slidably penetrate through the four corresponding fixed columns (21); A regeneration device (3) is arranged in the high-temperature treatment area (11) of the purification kettle (1), and the regeneration device (3) includes a heating frame (30) installed on the inner wall of the purification kettle (1). A cleaning component (31) for vibrating the molecular sieve adsorption plate (22) at a high speed is also installed in the high-temperature treatment area (11) of the purification kettle (1).

2. The device for separating and purifying ammonia decomposition products according to claim 1, characterized in that: Two intake pipes (12) and two outlet pipes (13) are symmetrically installed on both sides of the purification kettle (1). The intake pipe (12) conveys the product gas obtained from ammonia decomposition into the purification kettle (1), and the outlet pipe (13) conveys the gas that has been treated by the purification device (2) to the outside.

3. The device for separating and purifying ammonia decomposition products according to claim 1, characterized in that: The mounting frame (20) includes a U-shaped plate (200) and a clamping plate (201). The U-shaped plate (200) is slidably installed in the purification kettle (1) along the height direction of the purification kettle (1), and a strip-shaped groove for the U-shaped plate (200) to slide is also opened in the middle of the purification kettle (1). Two clamping plates (201) are symmetrically hinged and installed on both sides of the U-shaped plate (200), and an installation area for inserting and installing the molecular sieve adsorption plate (22) is provided between the clamping plates (201).

4. The device for separating and purifying ammonia decomposition products according to claim 1, characterized in that: Two electric push rods (4) are installed at the bottom of the purification kettle (1). The output ends of the two electric push rods (4) are vertically distributed. Connecting rods (40) are installed on the output ends of the electric push rods (4), and each connecting rod (40) is connected to two adjacent ones among the four groups of U-shaped plates (200).

5. The device for separating and purifying ammonia decomposition products according to claim 1, characterized in that: The cleaning component (31) includes two telescopic connecting shafts (310) rotatably installed on the inner wall of the purification kettle (1). A cleaning motor (311) is installed on one side of the telescopic connecting shaft (310). A synchronous belt (312) is sleeved on the ends of the two telescopic connecting shafts (310) close to the cleaning motor (311). A cam (313) is installed on the end of the telescopic connecting shaft (310) far from the cleaning motor (311). A linkage component (32) is also arranged at the end of the telescopic connecting shaft (310) close to the cam (313).

6. The device for separating and purifying ammonia decomposition products according to claim 5, characterized in that: The linkage component (32) comprises a vertical right-angle plate (320) installed inside the purification kettle (1) along its height direction, a linkage compression spring (321) is connected to the horizontal end of the vertical right-angle plate (320) and the inner wall of the purification kettle (1), a linkage gear (322) is meshed on one side of the vertical right-angle plate (320), and a horizontal right-angle plate (323) is also meshed on one side of the linkage gear (322), a linkage rope (324) is installed at one end of the horizontal right-angle plate (323), a linkage control board (325) is installed on the side of the linkage rope (324) away from the horizontal right-angle plate (323), the linkage control board (325) is installed on one end of the telescopic connecting shaft (310) close to the cam (313), and a rotation hole for the telescopic connecting shaft (310) to rotate is provided on the linkage control board (325); A plurality of rotating wheels (326) are installed at the bottom of the purification kettle (1), the linkage rope (324) is sleeved on the rotating wheels (326), and a control spring (327) is connected between the linkage control plate (325) and the inner wall of the purification kettle (1).

7. The device for separating and purifying ammonia decomposition products according to claim 1, characterized in that: The top of the purification kettle (1) is provided with a plurality of installation grooves (15) for taking the molecular sieve adsorption plates (22), and a cover plate (14) is provided on the installation grooves (15).

8. The device for separating and purifying ammonia decomposition products according to claim 1, characterized in that: The purification kettle (1) is also provided with a control component (5) for controlling the inclination of the molecular sieve adsorption plate (22). The control component (5) comprises a V-shaped control rod (50). The V-shaped control rod (50) is rotatably mounted on the inner wall of the purification kettle (1) via a torsion spring. One end of the V-shaped control rod (50) abuts against a horizontal right-angle plate (323), and the other end of the V-shaped control rod (50) abuts against the molecular sieve adsorption plate (22).

9. The device for separating and purifying ammonia decomposition products according to claim 1, characterized in that: The molecular sieve adsorption plate (22) is filled with a plurality of aluminum oxides and zeolites.

10. A process for separating and purifying ammonia decomposition products, using an ammonia decomposition product separation and purification device as claimed in any one of claims 1 to 9, characterized in that: The separation and purification process of ammonia decomposition products is as follows: S1. Ammonia decomposition: Liquid ammonia is heated and vaporized in a vaporizer, and then enters a decomposition furnace for catalytic cracking to generate hydrogen and nitrogen; S2, gas cooling: The high-temperature mixed gas is cooled by heat exchange with the raw ammonia through a heat exchanger, and then further cooled to room temperature through a water cooler; S3, adsorption purification: the mixed gas enters the interior of the purification kettle (1), and then is purified by the purification device (2), and the molecular sieve adsorption plate (22) in the purification device (2) adsorbs water and residual ammonia in the mixed gas; S4, auxiliary regeneration: after the molecular sieve adsorption plate (22) has been working for a long time, its adsorption performance gradually decreases, so the molecular sieve adsorption plate (22) is treated by the regeneration device (3) to ensure that the molecular sieve adsorption plate (22) is restored to its optimal adsorption performance; S5, Circulation Operation: After the molecular sieve adsorption plate (22) is circulated and regenerated, it is convenient to carry out uninterrupted purification operation on the mixed gas.

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