Baffled moving bed gas-solid reaction device, use method, and hydrofluorination production system

Abstract

A baffled moving bed gas-solid reaction device, a method of use, and a hydrofluorination production system belong to the technical field of uranium conversion production. The present invention is to improve the fluidity of uranium dioxide powder in the equipment so that uranium dioxide can fully contact with hydrogen fluoride in the tail gas of the uranium dioxide hydrofluorination process, thereby reducing the generation rate of fluorine-containing waste. The present invention includes a bed body, a moving center axis and a baffle, the bed body is provided with a feed pipe and an air inlet pipe, the top of the bed body is provided with an air outlet pipe, the bottom of the bed body is provided with a discharge port, a moving center axis is provided in the bed body, and a baffle is arranged on the moving center axis. The present invention has an ingenious structural design, a compact structure, complete functions, is easy to install and maintain, can effectively realize the reuse of hydrogen fluoride in the tail gas of the uranium dioxide hydrofluorination process, and is suitable for promotion and use.

Description

Technical Field

[0001] The invention relates to a gas-solid countercurrent contact reaction device, a use method and a hydrofluorination production system, belonging to the technical field of uranium conversion production equipment. Background Art

[0002] In the field of uranium conversion production, in the process of preparing uranium tetrafluoride by uranium dioxide hydrofluorination, excessive hydrogen fluoride measures are taken to improve the utilization rate of metallic uranium. An important indicator for testing the quality of hydrofluorination (hydrofluorination refers to the process of generating uranium tetrafluoride by the reaction of uranium dioxide and anhydrous hydrogen fluoride) processes and equipment is to make full use of hydrogen fluoride while obtaining high-quality uranium tetrafluoride products at a high yield.

[0003] At present, my country uses a two-stage series full countercurrent fluidized bed system to prepare uranium tetrafluoride. The uranium dioxide raw material prepared with UNH has poor activity. During the hydrofluorination reaction, the excess HF is high, up to 20% on average. The existing treatment of hydrogen fluoride in uranium dioxide hydrofluorination is often handled by a recovery device, and there is no reactor for HF absorption in the tail gas of the hydrofluorination process. In view of environmental protection and economic needs, it is necessary to recycle and reuse the excess HF.

[0004] The problem of the conventional moving bed reactor is that the material cannot move downward evenly, especially for powder materials with poor fluidity. Therefore, when recovering the excess HF, due to the single function of the conventional moving bed, the fluidity of the uranium dioxide material in the conventional moving bed is poor, resulting in the inability of uranium dioxide to fully absorb the excess HF.

[0005] Therefore, it is urgent to design a gas-solid countercurrent contact reaction device and extend the residence time and gas-solid contact area of ​​uranium dioxide in the reaction device as much as possible, so as to realize the direct recovery and utilization of excess HF from the hydrofluorination reaction, thereby significantly reducing the HF content in the tail gas of the hydrofluorination process, improving the utilization rate of hydrogen fluoride, and reducing the generation rate of fluorine-containing waste in the preparation process of uranium tetrafluoride from the source. Summary of the invention

[0006] The present invention is to improve the fluidity of uranium dioxide powder in the equipment so that uranium dioxide is fully contacted with hydrogen fluoride in the tail gas of uranium dioxide hydrofluorination process, and the generation rate of fluorine-containing waste is reduced. A brief summary of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this summary is not an exhaustive summary of the present invention. It is not intended to determine the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0007] Technical solution 1 of the present invention:

[0008] A baffled moving bed gas-solid reaction device comprises a bed body, a moving central axis and a baffle plate, wherein the bed body is provided with a feed pipe and an air inlet pipe, the top of the bed body is provided with an air outlet pipe, the bottom of the bed body is provided with a discharge port, a moving central axis is arranged in the bed body, and a baffle plate is arranged on the moving central axis.

[0009] Preferably, the feed pipe and the air intake pipe are both installed on the side wall of the bed, the feed pipe is arranged at the upper part of the bed, and the air intake pipe is arranged at the lower part of the bed.

[0010] Preferably, an upper cover is installed on the top of the bed, and the upper end of the moving central axis passes through the upper cover and is connected to a vibration mechanism.

[0011] Preferably: the vibration mechanism includes a motor, a cam and a transmission rod, the cam is installed on the output shaft of the motor, the transmission rod is connected to the fulcrum, one end of the transmission rod establishes a mounting relationship with the cam, and the other end of the transmission rod establishes a mounting relationship with the moving center axis.

[0012] Preferably: it also includes a tension spring, one end of which is connected to the moving central axis, and the other end of the tension spring is fixed.

[0013] Preferably, the baffle plate comprises an inner ring plate and an outer ring plate, and the inner ring plate and the outer ring plate are installed on the moving central shaft in an inclined manner.

[0014] Preferably, 15-25 levels of baffles are installed in the bed body, and any baffle comprises a pair of inner ring plates and an outer ring plate.

[0015] Preferably, the inner ring plate and the outer ring plate are arranged on the moving central axis at an angle of 5°-15°, the inner ring plate is inclined downward in the horizontal direction, and the outer ring plate is inclined upward in the horizontal direction.

[0016] Preferably, a sealing chamber is fixed at the center of the upper cover, the movable central axis passes through the sealing chamber, the gap formed by the sealing chamber and the movable central axis is filled with sealing filler, and the upper end of the sealing chamber is pressed by a sealing gland.

[0017] Preferably, an external heater is provided outside the bed.

[0018] Preferably, a distance tube is sleeved on the outer side of the movable central axis, and the inner ring plate and the outer ring plate are positioned by the distance tube.

[0019] Technical solution 2 of the present invention:

[0020] A method for using the baffled moving bed gas-solid reaction device as described in Scheme 1 comprises the following steps:

[0021] Step 1: Drive the moving center shaft to move, and the moving center shaft drives the baffle to vibrate up and down, with a vibration frequency of 10 to 60 times / min and an amplitude of 20 to 30 mm;

[0022] Step 2: solid powder material enters the bed from the feed pipe, and the reaction gas enters the bed from the air inlet pipe. The solid powder material and the reaction gas are in countercurrent contact. The material after contact with the reaction gas is discharged from the discharge port, and the gas after contact with the solid powder material is discharged from the air outlet pipe at the top of the bed.

[0023] Preferably, before executing step 1, the method further comprises heating the bed to the reaction temperature.

[0024] Technical solution three of the present invention:

[0025] A hydrofluorination production system comprises the baffled moving bed gas-solid reaction device described in Scheme 1, wherein the baffled moving bed gas-solid reaction device is arranged at the tail gas end of the hydrofluorination production system.

[0026] The present invention has the following beneficial effects:

[0027] The present invention provides a baffled moving bed gas-solid reaction device, which has the following beneficial effects:

[0028] 1. The gas enters from the bottom and the material enters from the top, and the gas-solid countercurrent contact is carried out to achieve good heat and mass transfer effects;

[0029] 2. The baffle is divided into inner and outer ring plates, and a pair of inner and outer ring plates is one level; the inner ring plate is tilted downward at an angle of 10° in the horizontal direction, and the outer ring plate is tilted upward at an angle of 10° in the horizontal direction; the inner and outer ring plates are fixed on the central axis, and the inner and outer ring plates are positioned with a distance tube.

[0030] This structure increases the retention time of materials in the reactor, and the fixed-distance tube design ensures that the baffles are not easily deformed. The inclination angle of 10° is equal to the material accumulation angle value to prevent the material from falling smoothly.

[0031] 3. It has 20 levels of baffles built in. The moving center axis drives the baffles connected to it to vibrate. The material jumps and falls step by step. The frequency is 10 to 60 times / min and the amplitude is 20-30mm. It enhances the mass transfer and heat transfer effect and effectively prolongs the reaction time. The adjustable frequency vibration design is suitable for most materials with poor fluidity to react.

[0032] 4. The baffled moving bed is equipped with upper and lower external heaters, and the temperature control is simple.

[0033] 5. The device is connected to the hydrofluorination (uranium dioxide reacts with HF to prepare uranium tetrafluoride) production system. In the device, uranium dioxide is used to react with the tail gas of the production system containing about 30% HF. The HF adsorption efficiency reaches more than 90%, and the excess HF in the hydrofluorination reaction is directly recycled, thereby significantly reducing the HF content in the tail gas of the hydrofluorination process, which has high environmental benefits and economic value.

[0034] 6. This device is suitable for reactions with materials with poor fluidity.

[0035] 7. The present invention has an ingenious structural design, a compact structure, complete functions, is easy to install and maintain, can effectively realize the recycling of hydrogen fluoride in the tail gas of the uranium oxide hydrofluorination process, and is suitable for promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of a baffled moving bed gas-solid reaction device;

[0037] Figure 2 This is the installation relationship diagram of the vibration mechanism and the moving center axis;

[0038] Figure 3 yes Figure 1 The enlarged schematic diagram of point A in the middle;

[0039] Figure 4 is a schematic diagram of a ninth embodiment;

[0040] Figure 5 is a schematic diagram of an eighth specific implementation mode;

[0041] Figure 6 This is a schematic diagram of the installation position of the guide ring in the bed body;

[0042] Figure 7 yes Figure 6 AA section view.

[0043] In the figure, 1-bed, 2-moving central axis, 3-baffle, 4-feed pipe, 5-inlet pipe, 6-outlet pipe, 7-discharge port, 8-upper cover, 9-vibration mechanism, 10-motor, 11-cam, 12-transmission rod, 13-tension spring, 14-inner ring plate, 15-outer ring plate, 16-sealing chamber, 17-sealing gland, 19-distance tube, 20-external heater, 21-upper temperature measuring sleeve, 22-lower temperature measuring sleeve, 23-base plate, 24-positioning hole, 25-locking nut, 26-cone, 27-guide ring, 28-feed port, 29-nitrogen inlet. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0045] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection (i.e., non-detachable connection) includes but is not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but is not limited to conventional detachable methods such as threaded connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can always be found in the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and hinge connection is selected for detachable connection.

[0046] Embodiment 1:

[0047] Reference Figure 1 As shown, this embodiment provides a baffled moving bed gas-solid reaction device, including a bed body 1, a moving central axis 2 and a baffle 3, the bed body 1 is provided with a feed pipe 4 and an air inlet pipe 5, the top of the bed body 1 is provided with an air outlet pipe 6, the bottom of the bed body 1 is provided with an outlet 7, a moving central axis 2 is arranged in the bed body 1, and the baffle 3 is arranged on the moving central axis 2.

[0048] The bed 1 is a vertical chamber, and the bed 1 is circular, square, rectangular, diamond-shaped, etc.;

[0049] In this embodiment, the bed 1 is a cylindrical cavity with a cylindrical appearance. A feed pipe 4 and an air inlet pipe 5 are provided on the bed 1. The air inlet pipe 5 is below the feed pipe 4. The mobile central axis 2 performs linear reciprocating motion in the bed 1, thereby realizing vibration. The uranium dioxide solid powder material enters the cavity from the feed pipe 4, falls on the vibrating baffle 3, and falls step by step, and contacts the reaction gas entering from the air inlet pipe 5 at the lower part of the bed 1 in countercurrent. The reacted material is discharged from the discharge port 7 at the bottom of the bed 1, and the reacted gas is discharged from the air outlet pipe 6 at the top of the bed 1.

[0050] The hydrogen fluoride in the tail gas of the uranium dioxide hydrofluorination process enters the bed 1 in a countercurrent manner from the air inlet pipe 5. In the bed 1, the tail gas of the uranium conversion to uranium dioxide process enters from the lower end of the bed 1 and countercurrently contacts with the uranium dioxide entering from the feed pipe 4 at the upper end of the bed 1. During the contact, the uranium dioxide falls downward and fully collides / contacts with the hydrogen fluoride flowing upward, thereby improving the absorption rate of the uranium dioxide to the hydrogen fluoride in the tail gas.

[0051] In addition, under the action of the moving central shaft 2 and the baffle 3, the uranium dioxide entering the bed 1 from the feed pipe 4 slowly falls, thereby prolonging the contact time between the uranium dioxide particles and the tail gas of the hydrofluorination process.

[0052] It should be further explained that those skilled in the art can change the arrangement of the feed pipe 4 and the air inlet pipe 5 on the bed 1 in any way, as long as it does not exceed the spirit of this patent, it is within the protection scope of this patent;

[0053] For example:

[0054] The feed pipe 4 and the air intake pipe 5 are arranged on the same side of the bed 1;

[0055] The feed pipe 4 and the air intake pipe 5 are arranged on different sides of the bed 1;

[0056] The feed pipe 4 is arranged above the center line of the bed 1 , and the air intake pipe 5 is arranged below the center line of the bed 1 .

[0057] Preferably, the tail gas of the hydrofluorination process is mostly excess HF gas, containing a small amount of impurities such as water vapor and nitrogen. The working environment is a hydrogen fluoride atmosphere, so the bed must be corrosion-resistant. In addition, it needs to be heated to 200℃~230℃ during operation, so the material of the moving bed must be resistant to high temperatures. After comprehensive consideration, Monel400 is selected as the material of the bed. Monel400 is a corrosion-resistant alloy with the largest dosage, the widest application, and excellent comprehensive performance. This alloy has excellent corrosion resistance in hydrofluoric acid and fluorine gas media, and also has excellent corrosion resistance to hot concentrated alkali solution.

[0058] In this embodiment, the feed pipe 4 is arranged and installed on the bed 1 in an inclined manner. A solid feed pipe 4 is arranged on the upper side of the bed. It is an inclined pipe. The inclination angle formed by the feed pipe 4 and the axis of the bed 1 is 20-60°, and the optimal inclination angle is 30°. The feed pipe 4 is installed on the bed 1 in an inclined manner, so that the uranium dioxide powder can enter the bed 1 in an incision manner, making the material entering the bed 1 smoother. In addition, the feed pipe 4 is installed on the bed 1 in an inclined manner, rather than being directly fixed above the bed 1. The purpose is to avoid that when the feed pipe 4 is arranged directly above the bed 1, the uranium dioxide particles entering the bed 1 from the feed pipe 4 fall vertically into the interior of the bed 1, so that the uranium dioxide will be deposited on the baffle 3 during its falling process, causing the uranium dioxide particles to be stuck on the baffle 3 (i.e., a "dead bed") phenomenon. Therefore, the feed pipe 4 is installed on the bed 1 in an inclined manner and also has the effect of buffering the entry of uranium dioxide particles, allowing them to continuously and slowly enter the bed, maintaining a good feeding state, and meeting the requirements for secondary contact between uranium dioxide and hydrogen fluoride.

[0059] In this embodiment (refer to Figure 1 , Figure 2 As shown in the figure, the top of the bed body 1 is equipped with an upper cover 8, and the upper end of the moving central shaft 2 passes through the upper cover 8 and is connected to a vibration mechanism 9. The vibration mechanism 9 can be an electric cylinder, a hydraulic cylinder, an electric telescopic rod, a motor, a cam reciprocating motion mechanism, or a mechanism that can drive the moving central shaft to complete linear reciprocating motion.

[0060] Under the action of the vibration mechanism 9, the vibration mechanism 9 drives the moving central shaft 2 to perform linear reciprocating motion in the bed body 1, and the baffle 3 is driven by the moving central shaft 2 to vibrate up and down in the bed body 1. In this way, the contact time between the uranium dioxide particles and the tail gas of the hydrofluorination process is prolonged, and the uranium dioxide particles are prevented from adhering to the baffle to cause a "dead bed" phenomenon.

[0061] In this embodiment (refer to Figure 1-Figure 3 As shown in the figure, the vibration mechanism 9 includes a motor 10, a cam 11 and a transmission rod 12. The cam 11 is an eccentric rotating cam. The cam 11 is installed on the output shaft of the motor 10. The transmission rod 12 is connected to the fulcrum O. One end of the transmission rod 12 is installed with the cam 11, and the other end of the transmission rod 12 is installed with the moving central axis 2. In this way, the motor 10 drives the cam 11 to rotate. Under the action of the cam 11, the transmission rod 12 moves with O as the fulcrum. The transmission rod 12 drives the moving central axis 2 to move up and down. The baffle 3 is driven by the central axis to vibrate up and down in the bed body, which further prolongs the contact time between the solid particles and the hydrogen fluoride tail gas of the hydrofluorination process, thereby increasing the absorption rate of uranium dioxide to hydrogen fluoride in the tail gas. In addition, under the action of the vibration mechanism 9 of this embodiment, the moving central axis 2 drives the baffle 3 to vibrate at a certain frequency, which prevents the uranium dioxide particles from sticking to the ring plate and causing the "dead bed" phenomenon.

[0062] In this embodiment (refer to Figure 2 As shown in the figure, a tension spring 13 is also installed on the moving center shaft 2, and the other end of the tension spring 13 is fixed, for example, fixed on the beam of the factory building (at point H). By setting the tension spring 13, the moving center shaft 2 has a rebound force during the reciprocating motion in the vertical direction. The benefits of this rebound force are: it can assist the moving center shaft 2 to rise, increase the vibration frequency of the vibration mechanism 9, and then increase the contact rate between uranium dioxide and hydrogen fluoride in the bed 1; under the action of the tension spring 13 hooked at point H, the gravity on the moving center shaft 2 can be reduced; under the action of the tension spring 13, it can assist in reducing the load of the motor 10 and increase the service life of the motor 10.

[0063] In this embodiment (refer to Figure 1 and Figure 3As shown), the baffle plate 3 includes an inner ring plate 14 and an outer ring plate 15, and the inner ring plate 14 and the outer ring plate 15 are installed on the moving central shaft 2 in an inclined manner.

[0064] The inner ring plate 14 and the outer ring plate 15 constitute a baffle, a pair of the inner ring plate 14 and the outer ring plate 15 is a stage, and a plurality of stages of baffles 3 are installed on the entire moving central shaft 2, for example, 20 stages, wherein the inner ring plate 14 and the outer ring plate 15 are arranged on the moving central shaft 2 at an angle of 10°, the inner ring plate 14 is inclined downward at an angle of 10° in the horizontal direction, and the outer ring plate 15 is inclined upward at an angle of 10° in the horizontal direction;

[0065] The baffle structure formed by the inner ring plate 14 and the outer ring plate 15 increases the residence time of the material in the reactor, and the inclination angle of 10° is equal to the material accumulation angle value to prevent the material from falling smoothly. The moving central shaft 2 drives the baffle connected to it to vibrate, and the material jumps and falls step by step, effectively prolonging the reaction time, which is suitable for most materials with poor fluidity to react.

[0066] In this embodiment (refer to Figure 1 and Figure 2 As shown in the figure, a sealing chamber 16 is fixed at the center of the upper cover 8, the mobile central shaft 2 passes through the sealing chamber 16, the gap formed by the sealing chamber 16 and the mobile central shaft 2 is filled with sealing packing, and the upper end of the sealing chamber 16 is pressed by a sealing gland 17 to achieve the sealing packing. A packing sealing box is arranged between the mobile central shaft 2 and the upper cover 8, and the sealing packing is filled in the sealing chamber 16 and the sealing gland 17 to achieve sealing to prevent leakage of fluorine-containing gas.

[0067] In this embodiment (refer to Figure 5 As shown in the figure, an external heater 20 is arranged outside the bed body 1 for heating the bed body 1. The external heater 20 is an electromagnetic coil (not shown in the figure) wound around the outer circumference of the bed body 1. By energizing the electromagnetic coil, inductive heating is realized, so that the reaction temperature inside the bed body 1 reaches 200-230°C. UO2 is used as a raw material to adsorb HF in the tail gas of the hydrofluorination process for chemical reaction, and a part of the obtained solid material is converted into UF4, which is used as a raw material for the hydrofluorination process to continue hydrofluorination, thereby realizing the recovery and recycling of HF in the tail gas of the hydrofluorination process.

[0068] Preferably, an upper temperature measuring sleeve 21 and a lower temperature measuring sleeve 22 are provided on the external heater 20, and temperature detection sensors are arranged and installed in the upper temperature measuring sleeve 21 and the lower temperature measuring sleeve 22 for monitoring the reaction temperature.

[0069] In this embodiment (refer to Figure 1 , Figure 3 and Figure 4As shown in the figure, the inner ring plate 14 and the outer ring plate 15 are fixed on the moving center shaft 2, and the inner ring plate 14 and the outer ring plate 15 are positioned by a distance tube 19. A base plate 23 is fixed on the moving center shaft 2, and the distance tube 19 is sleeved on the moving center shaft 2. The base plate 23 is used to support the distance tube 19. The distance tube 19 is processed with a plurality of positioning holes 24 from top to bottom. The positioning holes 24 are used to realize the positioning of the inner ring plate 14 and the outer ring plate 15. A section of external thread is processed on the upper end of the moving center shaft 2, and a locking nut 25 is installed on the external thread on the upper end of the moving center shaft 2. The locking nut 25 locks the distance tube 19 on the moving center shaft 2. Under the action of the distance tube 19, the inner ring plate 14 and the outer ring plate 15 are positioned and installed. At the same time, the distance tube 19 can improve the installation strength of the inner ring plate 14 and the outer ring plate 15 on the moving center shaft 2, and ensure that the baffle 3 (inner ring plate 14 and outer ring plate 15) is not easy to deform.

[0070] In this embodiment (refer to Figure 5 As shown), a cone 26 is connected to the lower end of the bed 1 by a flange, and a discharge port 7 is provided on the cone 26.

[0071] In this embodiment (refer to Figure 6 and Figure 7 As shown in the figure, a guide ring 27 is fixedly installed at the bottom of the bed body 1, and the bottom of the moving central shaft 2 is installed in the guide ring 27. The guide ring 27 plays a limiting role. Under the action of the guide ring 27, the moving central shaft 2 does not deflect during the up and down vibration process in the bed body 1, thereby preventing the moving central shaft 2 from contacting and colliding with the inner wall of the bed body 1 during the up and down vibration process.

[0072] In this embodiment (refer to Figure 1-Figure 7 As shown), a baffled moving bed gas-solid reaction device is provided, which is specifically defined as: the baffled moving bed has a cylindrical appearance, a DN150 air inlet pipe 5 is arranged at the lower part of the bed body 1, and the bottom is connected to the cone 26 through a flange, a DN100 discharge port 7 is arranged at the bottom of the cone 26, a DN100 solid material feed pipe 4 is arranged on the upper side of the bed body 1, the feed pipe 4 is inclined at an angle of 30° to the axis of the bed body, a feed port 28 is arranged on the side of the feed pipe 4, a DN10 nitrogen inlet 29 is arranged on the upper end flange cover, and an air outlet pipe 6 is arranged on the top of the bed body 1.

[0073] 20 levels of baffles 3 are installed in the bed body 1, and the baffles 3 are divided into an inner ring plate 14 and an outer ring plate 15, and a pair of inner and outer ring plates constitutes a level; the inner ring plate 14 is tilted downward at an angle of 10° in the horizontal direction, and the outer ring plate 15 is tilted upward at an angle of 10° in the horizontal direction; the inner and outer ring plates are fixed on the moving center shaft 2, and the inner and outer ring plates are positioned by a spacing tube 19; during operation, the inner and outer ring plates vibrate up and down inside the bed body 1 driven by the moving center shaft 2, and the frequency is adjustable (6 to 60) times / min, and the amplitude is 20mm; the top of the moving center shaft 2 passes through the upper flange of the bed body 1 and is connected to the transmission rod 12, and is hung on a tension spring 13 fixed at one end, and the lower end of the moving center shaft 2 passes through the guide ring 27, and the guide ring 27 is fixed on the lower flange of the bed body 1.

[0074] The transmission cam 11, the transmission rod 12 and the tension spring 13 form a vibration mechanism 9. The external motor 10 drives the transmission cam 11 to rotate, so that the transmission rod 12 moves up and down repeatedly, driving the moving center shaft 2 to vibrate up and down, thereby driving the moving center shaft 2, the inner ring plate 14, and the outer ring plate 15 to vibrate up and down. The tension spring 13 plays a buffering role in the up and down vibration process of the moving center shaft.

[0075] An upper temperature measuring sleeve 21 is arranged on the upper part of the bed, and a lower temperature measuring sleeve 22 is arranged on the lower part for monitoring the reaction temperature. An external heater 20 is arranged outside the bed for heating the moving bed.

[0076] Example 2: The method for using a baffled moving bed gas-solid reaction device described in this example is as follows:

[0077] The first step: start the external heater 20 to heat the moving bed to the reaction temperature, and use the upper temperature measuring sleeve 21 and the lower temperature measuring sleeve 22 to monitor the temperature.

[0078] Step 2: Start the vibration mechanism 9 to make the moving central axis 2 drive the baffle to vibrate up and down, and the vibration frequency is adjustable.

[0079] Step 3: Solid powder material enters from the moving bed feed pipe 4, falls on the vibrating baffle 3, and falls step by step by gravity, and countercurrently contacts with the reaction gas entering from the air inlet pipe 5 at the bottom of the bed 1. The reacted material is discharged from the discharge port 7, and the reacted gas is discharged from the air outlet pipe 6 at the top of the bed 1.

[0080] The device described in this embodiment is a baffled moving bed gas-solid reaction device described in Example 1.

[0081] Embodiment 3:

[0082] A baffled moving bed gas-solid reaction device described in Example 1 is connected to a hydrofluorination (uranium dioxide reacts with HF to prepare uranium tetrafluoride) production system. Specifically, the baffled moving bed gas-solid reaction device is arranged at the tail gas end of the hydrofluorination production system. In the device, uranium dioxide is reacted with the tail gas of the production system containing about 30% HF, and the HF adsorption efficiency reaches more than 90%, so that the excess HF in the hydrofluorination reaction is directly recovered and utilized, thereby significantly reducing the HF content in the tail gas of the hydrofluorination process, which has high environmental benefits and economic value.

[0083] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0084] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0085] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0086] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0087] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0088] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present invention will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present invention.

[0089] This implementation is only an exemplary description of this patent and does not limit its protection scope. Those skilled in the art may also make partial changes to it, as long as they do not exceed the spirit of this patent, they are all within the protection scope of this patent.

Claims

1. A baffled moving bed gas-solid reaction device, characterized in that: The invention comprises a bed (1), a movable central shaft (2) and a baffle (3); the bed (1) is provided with a feed pipe (4) and an air inlet pipe (5); the top of the bed (1) is provided with an air outlet pipe (6); the bottom of the bed (1) is provided with an outlet (7); a movable central shaft (2) is arranged inside the bed (1); and a baffle (3) is arranged on the movable central shaft (2); The feed pipe (4) and the air intake pipe (5) are both installed on the side wall of the bed (1), the feed pipe (4) is arranged at the upper part of the bed (1), and the air intake pipe (5) is arranged at the lower part of the bed (1); An upper cover (8) is installed on the top of the bed body (1), and the upper end of the moving central shaft (2) passes through the upper cover (8) and is connected to a vibration mechanism (9); The vibration mechanism (9) comprises a motor (10), a cam (11) and a transmission rod (12); the cam (11) is mounted on the output shaft of the motor (10); the transmission rod (12) is connected to a fulcrum; one end of the transmission rod (12) is mounted on the cam (11); and the other end of the transmission rod (12) is mounted on the moving central shaft (2); The baffle plate (3) comprises an inner ring plate (14) and an outer ring plate (15), and the inner ring plate (14) and the outer ring plate (15) are installed on the moving central shaft (2) in an inclined manner; 15 to 25 levels of baffles (3) are installed in the bed (1), and each level of baffles (3) comprises a pair of inner ring plates (14) and outer ring plates (15); The inner ring plate (14) and the outer ring plate (15) are arranged on the moving central axis (2) at an angle of 5°-15°, the inner ring plate (14) is inclined downward in the horizontal direction, and the outer ring plate (15) is inclined upward in the horizontal direction; A sealing chamber (16) is fixed at the center of the upper cover (8), the movable central axis (2) passes through the sealing chamber (16), the gap formed by the sealing chamber (16) and the movable central axis (2) is filled with sealing filler, and the upper end of the sealing chamber (16) is pressed by a sealing gland (17) to tighten the sealing filler.

2. The baffled moving bed gas-solid reaction device according to claim 1, characterized in that: It also includes a tension spring (13), one end of which is connected to the moving central shaft (2), and the other end of which is fixed.

3. The baffled moving bed gas-solid reaction device according to claim 1, characterized in that: An external heater (20) is arranged outside the bed (1).

4. The baffled moving bed gas-solid reaction device according to claim 1, characterized in that: A distance tube (19) is sleeved on the outer side of the movable central axis (2), and the inner ring plate (14) and the outer ring plate (15) are positioned by the distance tube (19).

5. A method for using the baffled moving bed gas-solid reaction device according to any one of claims 1 to 4, characterized in that: The following steps are included: Step 1: driving the moving central shaft (2) to move, and the moving central shaft (2) drives the baffle (3) to vibrate up and down, with a vibration frequency of 10 to 60 times / min and an amplitude of 20 to 30 mm; Step 2: solid powder material is introduced into the bed (1) from the feed pipe (4), and the reaction gas is introduced into the bed (1) from the air inlet pipe (5), the solid powder material and the reaction gas are in countercurrent contact, the material after contact with the reaction gas is discharged from the discharge port (7), and the gas after contact with the solid powder material is discharged from the air outlet pipe (6) at the top of the bed (1).

6. The method of use according to claim 5, characterized in that: Before executing step 1, the process further includes heating the bed (1) to the reaction temperature.

7. A hydrofluorination production system, characterized in that: It comprises the baffled moving bed gas-solid reaction device as described in any one of claims 1 to 4, and the baffled moving bed gas-solid reaction device is arranged at the tail gas end of the hydrofluorination production system.

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