Anhydrous roasting regeneration device for molecular sieve catalyst

Abstract

The utility model relates to the technical field of molecular sieve catalyst anhydrous roasting regeneration, and discloses a molecular sieve catalyst anhydrous roasting regeneration device which comprises a box body, a partition plate, a placement seat, a mounting seat, a heating plate, a heat recovery assembly, a preheating dehumidification assembly, a feeding and discharging assembly, two box doors and a lifting plate, the partition plate is fixedly installed on the inner side wall of the box body, rectangular openings are formed in the two sides of the box body, two sliding blocks are fixedly installed on the bottom side of the containing base, the two sliding blocks are slidably installed on the inner wall of the bottom of the box body, and the feeding and discharging assembly is arranged on the box body and matched with the two rectangular openings. The feeding and discharging assembly is connected with the two sliding blocks. The molecular sieve catalyst roasting regeneration device has the advantages that efficient heat recovery and dehumidification preheating functions are achieved, roasting regeneration of a molecular sieve catalyst can be achieved under the water-free condition, meanwhile, energy consumption is reduced, and the regeneration efficiency and the recycling performance of the catalyst are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of anhydrous calcination regeneration of molecular sieve catalysts, and particularly relates to an anhydrous calcination regeneration device for molecular sieve catalysts. Background Art

[0002] In the production and application process of molecular sieve catalysts, the anhydrous calcination regeneration technology plays a crucial role. Traditional regeneration methods often have problems such as high energy consumption, low regeneration efficiency, and incomplete dehydration, which directly affect the recycling effect of catalysts and production efficiency. Therefore, it is particularly important to develop an anhydrous calcination regeneration device for molecular sieve catalysts that is efficient, energy-saving, and can ensure anhydrous conditions.

[0003] In view of the problems existing in the above background art, the utility model proposes an improved anhydrous calcination regeneration device for molecular sieve catalysts. On the basis of retaining the original anhydrous calcination and regeneration functions, the device further optimizes the heat recovery and preheating and dehumidification systems, improving the energy utilization efficiency and dehydration effect.

[0004] The information disclosed in this background art section is only intended to enhance the overall understanding of the utility model and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an anhydrous calcination regeneration device for molecular sieve catalysts, which has the functions of efficient heat recovery and dehumidification preheating, can realize the calcination regeneration of molecular sieve catalysts under anhydrous conditions, and at the same time reduce energy consumption, improve the regeneration efficiency and the recycling performance of catalysts.

[0006] The above technical purpose of the utility model is achieved by the following technical solutions: an anhydrous calcination regeneration device for molecular sieve catalysts, comprising a box body, a partition board, a placement seat, a mounting seat, a heating plate, a temperature sensor, a heat recovery component, a preheating and dehumidifying component, a feeding and discharging component, two box doors, and a lifting plate;

[0007] The partition is fixedly installed on the inner side wall of the box body. Rectangular openings are provided on both sides of the box body. Two sliders are fixedly installed on the bottom side of the placing seat, and both sliders are slidably installed on the bottom inner wall of the box body. The feeding and discharging assembly is arranged on the box body and is adapted to the two rectangular openings, and the feeding and discharging assembly is connected to the two sliders. Two box doors are respectively slidably installed in the corresponding rectangular openings. The lifting plate is fixedly installed on one side where the two box doors are close to each other. The mounting seat is fixedly installed on the bottom side of the lifting plate. The heating plate and the temperature sensor are both fixedly installed in the mounting seat and are located directly above the placing seat. The heat recovery assembly is arranged on the partition. The preheating and dehumidifying assembly is arranged on the lifting plate, and the heat recovery assembly is connected to the preheating and dehumidifying assembly and the mounting seat. An exhaust pipe connected to the air purification device is fixedly installed on the box body, and the exhaust pipe is connected to the heat recovery assembly.

[0008] The further setting of the present utility model is: The feeding and discharging assembly includes two support plates, two sprockets, a chain and a servo motor. Support plates are fixedly installed at the bottoms of both sides of the box body. Sprockets are rotatably installed on the two support plates. The same chain is drivingly connected to the two sprockets, and the chain passes through the two rectangular openings. A servo motor is fixedly installed on the front side of one of the support plates, and the output shaft of the servo motor is axially fixedly connected to the corresponding sprocket. Two rotating pins are rotatably installed on one side where the two sliders are close to each other, and both rotating pins are rotatably installed on the sprocket.

[0009] By adopting the above technical solution, it is possible to control the entry and exit of the placing seat into and out of the box body as needed.

[0010] The further setting of the present utility model is: The width of the support plate is greater than the width of the chain.

[0011] By adopting the above technical solution, it is possible to provide stable support for the slider when the placing seat is moved out of the box body.

[0012] The further setting of the present utility model is: Wedge-shaped plates are fixedly installed on both sides of the placing seat, and the bottoms of one side where the two box doors are close to each other are both inclined.

[0013] By adopting the above technical solution, it is possible to control the upward movement of the box door when the wedge-shaped plate abuts against the inclined surface of the box door, so as to realize the automatic opening and closing of the box door.

[0014] The further setting of the present utility model is: The preheating and dehumidifying assembly includes a vertical pipe, a mounting cover and a humidity sensor. The vertical pipe is fixedly installed on the lifting plate, the bottom end of the vertical pipe extends below the lifting plate and is fixedly installed with and communicated with the mounting cover, and the humidity sensor is fixedly installed on the inner wall of the top of the mounting cover.

[0015] By adopting the above technical solution, it is possible to monitor the humidity of the molecular sieve catalyst placed therein and dehumidify and preheat it when the placement seat moves below the installation cover.

[0016] A further setting of the present utility model is that: a plurality of ventilation openings are provided on the inner wall of the top of the installation cover, and a plurality of filter plates arranged in a hemispherical shape are fixedly installed on the inner wall of the top of the installation cover.

[0017] By adopting the above technical solution, it is possible to ensure normal ventilation when the installation cover covers the placement seat and blows hot air into the placement seat for dehumidification and preheating operations, and at the same time, it is possible to avoid the situation that the hot air blown in raises the molecular sieve catalyst and escapes from the installation cover and the placement seat.

[0018] A further setting of the present utility model is that: the heat recovery assembly includes a heat exchange tube, an exhaust fan, a first hose and a second hose. The heat exchange tube is fixedly installed on the partition plate, the exhaust pipe is communicated with the heat exchange tube, the exhaust fan is fixedly installed on the bottom side of the partition plate, the air outlet of the exhaust fan is communicated with the heat exchange tube, the air inlet pipe of the exhaust fan and the air outlet of the heat exchange tube are respectively fixedly installed with the first hose and the second hose, and the first hose and the second hose are respectively communicated with the installation seat and the vertical pipe.

[0019] By adopting the above technical solution, it is possible to recover the excess heat generated when heating the molecular sieve catalyst and store it in the heat medium above the partition plate.

[0020] A further setting of the present utility model is that: control valves are fixedly installed on both the exhaust pipe and the heat exchange tube.

[0021] By adopting the above technical solution, it is possible to select to discharge the air in the heat exchange tube through the exhaust pipe or the vertical pipe as needed.

[0022] A further setting of the present utility model is that: the control valve is an electromagnetic valve.

[0023] By adopting the above technical solution, it is convenient for the operator to perform on-off control through the controller.

[0024] A further setting of the present utility model is that: a guide groove is provided on the inner wall of the bottom of the box body, and the chain is in sliding contact with the inner wall of the guide groove.

[0025] By adopting the above technical solution, it is possible to avoid the chain affecting the opening and closing of the box door.

[0026] The beneficial effect of the present utility model is:

[0027] The molecular sieve catalyst anhydrous calcination regeneration device provided by the present utility model, while retaining the original advantages of anhydrous calcination and high-efficiency dehydration, further enhances the operation convenience and automation level, and significantly improves the comprehensive performance of the equipment. Specifically, its optimization and advantages are reflected in the following aspects:

[0028] First, through the newly added feeding and discharging component, especially the design of using a servo motor to drive a chain to drive the placement seat and the slider to slide along the bottom of the box, not only simplifies the loading and unloading process of the molecular sieve catalyst, but also realizes a high degree of automation in this process. The operator only needs to start the servo motor through the controller to easily complete the feeding and discharging operation, greatly improving the work efficiency and reducing the labor intensity.

[0029] Secondly, the linkage design between the box door and the placement seat (i.e., the cooperation between the wedge plate and the inclined surface of the box door) realizes the automatic opening and closing function of the box door. When the placement seat moves to the position of the box door, the wedge plate automatically pushes the box door to slide upward and open. After the placement seat completely enters or exits the box, the box door can automatically reset and close, further improving the intelligent level of the equipment and the convenience of operation.

[0030] Furthermore, the ingenious setting of the preheating and dehumidifying component enables effective humidity monitoring and dehumidifying preheating treatment of the molecular sieve catalyst before formal calcination. The humidity sensor continuously monitors the humidity condition of the catalyst in the placement seat and timely starts the hot air system to preheat and dehumidify the catalyst, effectively ensuring the smooth progress of the subsequent anhydrous calcination process and improving the regeneration effect of the catalyst.

[0031] In addition, the addition of the heat recovery component incorporates the concept of energy conservation and emission reduction into every detail of the equipment design. The excess heat generated during the calcination process is collected by the exhaust fan and transferred to the heat medium through the heat exchange tube for storage and reuse. This not only reduces energy waste but also lowers the operating cost of the equipment, achieving a win-win situation for economic and environmental benefits.

[0032] In summary, the anhydrous calcination and regeneration device for molecular sieve catalysts of the present utility model, while maintaining the original technical advantages, further improves the automation level, operation convenience, and energy utilization efficiency of the equipment through a series of innovations and optimizations, providing a more efficient and intelligent solution for the regeneration treatment of molecular sieve catalysts. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0034] Figure 1 It is a schematic three-dimensional structure diagram of an anhydrous calcination and regeneration device for molecular sieve catalysts proposed by the present utility model;

[0035] Figure 2 The sectional structure schematic diagram of an anhydrous calcination regeneration device for a molecular sieve catalyst proposed by the present utility model;

[0036] Figure 3 The partial three-dimensional structure schematic diagram of an anhydrous calcination regeneration device for a molecular sieve catalyst proposed by the present utility model;

[0037] Figure 4 The three-dimensional structure schematic diagram of the lifting plate and the box door part in an anhydrous calcination regeneration device for a molecular sieve catalyst proposed by the present utility model.

[0038] In the figure, 1. box body; 11. support plate; 12. sprocket; 13. chain; 14. servo motor; 2. placing seat; 21. slider; 22. wedge plate; 3. box door; 31. lifting plate; 4. mounting seat; 41. heating plate; 42. temperature sensor; 5. vertical pipe; 51. mounting cover; 52. humidity sensor; 53. filter plate; 6. partition board; 61. exhaust fan; 62. heat exchange pipe; 63. hose one; 64. hose two; 65. exhaust pipe; 66. control valve. Specific embodiments

[0039] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0040] Refer to Figures 1-4, A device for anhydrous calcination regeneration of a molecular sieve catalyst, comprising a box body 1, a partition plate 6, a placement seat 2, a mounting seat 4, a heating plate 41, a temperature sensor 42, two box doors 3 and a lifting plate 31. The partition plate 6 is fixedly installed on the inner side wall of the box body 1. Rectangular openings are provided on both sides of the box body 1. Two sliders 21 are fixedly installed on the bottom side of the placement seat 2, and both sliders 21 are slidably installed on the bottom inner wall of the box body 1. The two box doors 3 are respectively slidably installed in the corresponding rectangular openings. The lifting plate 31 is fixedly installed on one side of the two box doors 3 close to each other. Support plates 11 are fixedly installed at the bottom of both sides of the box body 1. Chain wheels 12 are rotatably installed on both support plates 11. The same chain 13 is drivingly connected to the two chain wheels 12, and the chain 13 passes through the two rectangular openings. A servo motor 14 is fixedly installed on the front side of one of the support plates 11, and the output shaft of the servo motor 14 is axially fixedly connected to the corresponding chain wheel 12. Two rotating pins are rotatably installed on one side of the two sliders 21 close to each other, and both rotating pins are rotatably installed on the chain wheel 12, which can control the placement seat 2 to enter and exit the box body 1 as needed. Moreover, the width of the support plate 11 is greater than the width of the chain 13, which can provide stable support for the slider 21 when the placement seat 2 is moved out of the box body 1. The mounting seat 4 is fixedly installed on the bottom side of the lifting plate 31. The heating plate 41 and the temperature sensor 42 are both fixedly installed in the mounting seat 4 and are located directly above the placement seat 2. An exhaust pipe 65 connected to an air purification device is fixedly installed on the box body 1. A heat exchange pipe 62 is fixedly installed on the partition plate 6, and the exhaust pipe 65 is communicated with the heat exchange pipe 62. An exhaust fan 61 is fixedly installed on the bottom side of the partition plate 6, and the air outlet of the exhaust fan 61 is communicated with the heat exchange pipe 62. A flexible hose one 63 and a flexible hose two 64 are respectively fixedly installed on the air inlet pipe of the exhaust fan 61 and the air outlet of the heat exchange pipe 62, and the flexible hose one 63 and the flexible hose two 64 are respectively communicated with the mounting seat 4 and the vertical pipe 5. Among them, both the flexible hose one 63 and the flexible hose two 64 adopt hoses known in the prior art that can achieve stretching, bending and have high temperature resistance performance, which can recover and store the excess heat generated when heating the molecular sieve catalyst in the heat medium above the partition plate 6. A vertical pipe 5 is fixedly installed on the lifting plate 31. The bottom end of the vertical pipe 5 extends below the lifting plate 31 and is fixedly installed with and communicated with a mounting cover 51. A humidity sensor 52 is fixedly installed on the top inner wall of the mounting cover 51, which can monitor the humidity of the molecular sieve catalyst placed therein and perform dehumidification and preheating when the placement seat 2 moves below the mounting cover 51.

[0041] Specifically, in order to be able to automatically open and close the box door 3, wedge-shaped plates 22 are fixedly installed on both sides of the placement seat 2. The bottom sides of the two box doors 3 close to each other are both inclined. When the wedge-shaped plate 22 abuts against the inclined surface of the box door 3, it controls the box door 3 to move upward, so as to be able to automatically open and close the box door 3.

[0042] Specifically, in order to ensure normal ventilation when the installation cover 51 covers the placement seat 2 and blows hot air into the placement seat 2 for dehumidification and preheating operations, and at the same time to avoid the situation where the hot air blown in raises the molecular sieve catalyst and escapes from the installation cover 51 and the placement seat 2, a plurality of ventilation openings are provided on the inner wall of the top of the installation cover 51, and a plurality of filter plates 53 arranged in a hemispherical shape are fixedly installed on the inner wall of the top of the installation cover 51.

[0043] Specifically, in order to be able to select to discharge the air in the heat exchange tube 62 through the exhaust pipe 65 or the vertical pipe 5 as needed, and at the same time to facilitate the operator to perform on-off control through the controller, control valves 66 are fixedly installed on both the exhaust pipe 65 and the heat exchange tube 62, and the control valve 66 is a solenoid valve.

[0044] Specifically, in order to prevent the chain 13 from affecting the opening and closing of the box door 3, a guide groove is provided on the inner wall of the bottom of the box body 1, and the chain 13 is in sliding contact with the inner wall of the guide groove.

[0045] For the involved exhaust fans, heating plates, temperature sensors, humidity sensors, etc., as well as the involved circuits, electronic components and module mechanisms, etc., existing technologies are adopted, and those skilled in the art can fully implement them without further elaboration. The content protected by this application does not involve improvements to software, circuits and methods.

[0046] Working principle:

[0047] When the molecular sieve catalyst needs to be calcined and regenerated without water, first turn on the power supply and drive the sprocket 12 and the chain 13 to rotate through the servo motor 14, and then drive the slider 21 fixed with the rotating pin and the placement seat 2 to slide along the inner wall of the bottom of the box body 1 until the placement seat 2 completely moves out of the box body 1. This step facilitates the staff to place the molecular sieve catalyst to be regenerated on the placement seat 2, and the operation is simple and fast. During the process of the placement seat 2 moving out of the box body 1, the wedge plate 22 contacts and abuts against the inclined surface at the bottom side of the box door 3, which can realize the automatic opening of the box door 3 without manual operation of opening and closing the box door 3, improving the degree of automation.

[0048] Place the molecular sieve catalyst to be regenerated in the molecular sieve drying tank, and then place it in the placement seat 2. After placing the catalyst, the servo motor 14 runs in reverse, driving the placement seat 2 and the catalyst back into the interior of the box body 1. At the same time, the box door 3 disengages from the wedge-shaped plate 22, so that the lifting plate 31 can drive the box door 3 to reset and close the rectangular opening under the action of the self-weight of components such as the lifting plate 31 and the mounting seat 4. At this time, the heating plate 41 starts to uniformly heat the catalyst on the placement seat 2 to realize the anhydrous roasting process. During the heating process, the excess heat released by the molecular sieve catalyst is sucked into by the exhaust fan 61 through the hose 63 under the mounting seat 4 and recovered through the heat exchange tube 62. This part of the heat can be stored in the heat medium above the partition plate 6 for subsequent preheating or heating processes, thus realizing the recycling of energy and improving the energy utilization efficiency. According to actual needs, the operator can adjust the opening and closing of the control valve 66 through the controller to flexibly select to discharge the air in the heat exchange tube 62 through the exhaust pipe 65 or directly introduce it into the vertical pipe 5 to provide additional preheating and dehumidification treatment for the molecular sieve catalyst to be regenerated next. That is, during the subsequent processing, when the placement seat 2 moves into the box body 1 and stops passing through the position of the mounting cover 51, the humidity sensor 52 detects its humidity and controls the hot air to blow on it according to needs, so as to realize the dehumidification and preheating operation.

[0049] After the roasting of the molecular sieve catalyst is completed and humidity monitoring and dehumidification preheating are required, move the placement seat 2 to directly below the mounting cover 51 until the mounting cover 51 covers the placement seat 2. At this time, the humidity sensor 52 in the mounting cover 51 detects the humidity of the catalyst and starts the dehumidification preheating program according to needs. The hot air is blown into the placement seat 2 through the vertical pipe 5 and multiple air vents at the top of the mounting cover 51. The design of the filter plate 53 effectively prevents the problem of dust flying caused by the hot air directly impacting the surface of the catalyst, ensuring the smooth progress of the dehumidification preheating process.

[0050] The entire regeneration process realizes a high degree of automation and intelligence, not only improving work efficiency, but also significantly reducing energy consumption and labor costs. At the same time, through precise temperature and humidity control and an efficient heat recovery system, the regeneration quality of the molecular sieve catalyst is ensured, providing a strong guarantee for the recycling of the catalyst.

[0051] The above has introduced in detail a molecular sieve catalyst anhydrous calcination regeneration device provided by the present utility model. Specific embodiments are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A molecular sieve catalyst anhydrous roasting regeneration device, characterized in that: It comprises a box body (1), a partition (6), a placement seat (2), a mounting seat (4), a heating plate (41), a temperature sensor (42), a heat recovery component, a preheating and dehumidification component, a material inlet and outlet component, two box doors (3) and a lifting plate (31); The partition (6) is fixedly mounted on the inner side wall of the box body (1), and rectangular openings are provided on both sides of the box body (1). Two sliders (21) are fixedly mounted on the bottom side of the placement seat (2), and the two sliders (21) are slidably mounted on the bottom inner wall of the box body (1). The material inlet and outlet assembly is arranged on the box body (1) and is adapted to the two rectangular openings, and the material inlet and outlet assembly is connected to the two sliders (21). The two box doors (3) are slidably mounted in the corresponding rectangular openings, respectively, and the lifting plate (31) is fixedly mounted on the two box doors (3) so as to be close to each other. On one side of the lifting plate (31), the mounting seat (4) is fixedly mounted on the bottom side of the lifting plate (31), the heating plate (41) and the temperature sensor (42) are both fixedly mounted in the mounting seat (4) and are located directly above the placement seat (2), the heat recovery component is arranged on the partition (6), the preheating and dehumidification component is arranged on the lifting plate (31), and the heat recovery component is connected to the preheating and dehumidification component and the mounting seat (4), and an exhaust pipe (65) connected to the air purification device is fixedly mounted on the box body (1), and the exhaust pipe (65) is connected to the heat recovery component.

2. A molecular sieve catalyst anhydrous roasting regeneration device according to claim 1, characterized in that: The material inlet and outlet assembly comprises two support plates (11), two sprocket wheels (12), a chain (13) and a servo motor (14). The support plates (11) are fixedly mounted on the bottom of both sides of the box body (1). The sprocket wheels (12) are rotatably mounted on the two support plates (11). The two sprocket wheels (12) are transmission-connected with the same chain (13), and the chain (13) passes through two rectangular openings. The front side of one of the support plates (11) is fixedly mounted with a servo motor (14). The output shaft of the servo motor (14) is axially fixedly connected to the corresponding sprocket wheel (12). Two rotating pins are rotatably mounted on the sides of the two sliders (21) close to each other, and the two rotating pins are rotatably mounted on the sprocket wheels (12).

3. A molecular sieve catalyst anhydrous roasting regeneration device according to claim 2, characterized in that: The width of the support plate (11) is greater than the width of the chain (13).

4. A molecular sieve catalyst anhydrous roasting regeneration device according to claim 1, characterized in that: Wedge-shaped plates (22) are fixedly mounted on both sides of the placement seat (2), and the bottoms of the sides of the two cabinet doors (3) that are close to each other are arranged in an inclined shape.

5. The molecular sieve catalyst anhydrous roasting regeneration device according to claim 1, characterized in that: The preheating and dehumidifying assembly comprises a vertical pipe (5), a mounting cover (51) and a humidity sensor (52); the vertical pipe (5) is fixedly mounted on the lifting plate (31); the bottom end of the vertical pipe (5) extends below the lifting plate (31) and is fixedly mounted with the mounting cover (51) and is in communication with the mounting cover (51); the humidity sensor (52) is fixedly mounted on the top inner wall of the mounting cover (51).

6. A molecular sieve catalyst anhydrous roasting regeneration device according to claim 5, characterized in that: A plurality of ventilation ports are provided on the top inner wall of the installation cover (51), and a plurality of filter plates (53) arranged in a hemispherical shape are fixedly mounted on the top inner wall of the installation cover (51).

7. The molecular sieve catalyst anhydrous roasting regeneration device according to claim 5, characterized in that: The heat recovery component comprises a heat exchange tube (62), an exhaust fan (61), a hose 1 (63) and a hose 2 (64); the heat exchange tube (62) is fixedly mounted on the partition (6); the exhaust pipe (65) is connected to the heat exchange tube (62); the exhaust fan (61) is fixedly mounted on the bottom side of the partition (6); the air outlet of the exhaust fan (61) is connected to the heat exchange tube (62); the air inlet pipe of the exhaust fan (61) and the air outlet of the heat exchange tube (62) are respectively fixedly mounted with a hose 1 (63) and a hose 2 (64); and the hose 1 (63) and the hose 2 (64) are respectively connected to the mounting base (4) and the vertical pipe (5).

8. A molecular sieve catalyst anhydrous roasting regeneration device according to claim 7, characterized in that: The exhaust pipe (65) and the heat exchange pipe (62) are both fixedly mounted with a control valve (66).

9. A molecular sieve catalyst anhydrous roasting regeneration device according to claim 8, characterized in that: The control valve (66) is a solenoid valve.

10. The molecular sieve catalyst anhydrous roasting regeneration device according to claim 2, characterized in that: A guide groove is provided on the inner wall of the bottom of the box body (1), and the chain (13) is in sliding contact with the inner wall of the guide groove.

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