An adsorption dryer for isobutane dehydrogenation product

Abstract

An adsorption dryer for isobutane dehydrogenation product relates to the technical field of molecular sieve dryer and comprises a cylinder, two fixed plates are fixedly arranged on the inner wall of the cylinder, a plurality of fixedly arranged air ducts are arranged between the two fixed plates in the circumferential direction, the top end and the bottom end of the air ducts respectively penetrate through the two fixed plates, the upper inner wall and the lower inner wall of the air duct are correspondingly provided with an upper air separation plate and a lower air separation plate, air holes are arranged on the upper air separation plate and the lower air separation plate, the outer wall of the air duct is provided with a material conveying shell in communication therewith, and the adsorption material circulates and flows in the counterclockwise direction between the air duct and the material conveying shell. The present application solves the problem that the saturation gradient of the adsorption material in the existing molecular sieve dryer leads to the shortening of the effective adsorption length during operation.

Description

Technical Field

[0001] This invention relates to the field of molecular sieve dryer technology, specifically to an adsorption dryer for isobutane dehydrogenation products. Background Technology

[0002] The isobutane dehydrogenation to isobutene process is a basic organic chemical technology that uses isobutane as raw material to produce isobutene and hydrogen through a catalytic dehydrogenation reaction under high temperature and low pressure conditions. It is also an important way to comprehensively utilize C4 hydrocarbon resources. The reaction products obtained by this process need to be further sent to a molecular sieve dryer equipped with adsorption material to remove water and hydrogen sulfide through adsorption to meet the requirements of subsequent processing or product specifications.

[0003] Existing molecular sieve dryers have gradually revealed their shortcomings during use, mainly in the following aspects: The saturation gradient of the adsorbent material leads to a shortening of the effective adsorption length. Specifically, in a molecular sieve dryer, the adsorbent material is fixedly packed inside the cylinder. As the adsorption process continues, a significant saturation gradient will form in the vertical direction. That is, the upper layer of adsorbent material reaches saturation first, while the lower layer of adsorbent material is still unsaturated, which in turn leads to a shortening of the effective adsorption length and affects the adsorption effect.

[0004] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an adsorption dryer for isobutane dehydrogenation products. During operation, the saturation rate of the adsorption materials increases at similar rates, thereby ensuring a consistent saturation state and guaranteeing the effective adsorption length of the products, significantly improving the adsorption effect.

[0006] To address the above problems, the present invention provides the following technical solution: An adsorption dryer for isobutane dehydrogenation products includes a cylindrical body. Two fixed plates are fixedly arranged on the inner wall of the cylindrical body. A plurality of fixedly arranged venting cylinders are arranged circumferentially between the two fixed plates. The top and bottom ends of the venting cylinders pass through the two fixed plates respectively. An upper venting baffle plate and a lower venting baffle plate are respectively provided on the upper and lower inner walls of the venting cylinders. Ventilation holes are provided on both the upper and lower venting baffle plates. A material conveying shell is provided on the outer wall of the venting cylinders and communicates with it. The adsorbent material circulates counterclockwise between the venting cylinders and the material conveying shell.

[0007] As an optimized solution, the upper outer wall and lower outer wall of the material conveying shell are respectively provided with a discharge pipe and a feed pipe, which are located between the upper ventilated baffle plate and the lower ventilated baffle plate and are both connected to the ventilator.

[0008] As an optimized solution, the lower ventilation baffle is inclined.

[0009] As an optimized solution, the top and bottom of the conveying housing are respectively fixedly connected to two fixed plates, and an auger is rotatably installed inside the conveying housing.

[0010] As an optimized solution, one of the fixed plates has several drive motors fixedly mounted on its bottom, and the output shaft of the drive motor is fixedly connected to the auger.

[0011] As an optimized solution, the outer wall of the drive motor is fitted with a protective shell.

[0012] As an optimized solution, the top and bottom of the cylinder are respectively provided with an upper air inlet pipe and a lower exhaust pipe, and the cylinder is provided with an upper gas distributor that communicates with the upper air inlet pipe.

[0013] As an optimized solution, the top and bottom of the cylinder are respectively provided with an upper exhaust pipe and a lower air inlet pipe, and the lower interior of the cylinder is provided with a lower gas distributor that communicates with the lower air inlet pipe.

[0014] As an optimized solution, two upper support grids are fixedly provided on the inner wall of the cylinder, and two lower support grids are fixedly provided on the inner wall of the cylinder, with ceramic balls filling the space between the two upper support grids and the two lower support grids.

[0015] As an optimized solution, the bottom of the cylinder is fixedly provided with several support legs.

[0016] Compared with the prior art, the beneficial effects of the present invention are: During the adsorption and desorption processes, the auger rotates to transport the adsorbent material, which circulates counterclockwise between the ventilation cylinder and the material conveying shell. This ensures that the adsorbent material can come into uniform contact with the product or hot dry gas. During adsorption, the saturation rate of the adsorbent material increases at similar rates, resulting in a consistent saturation state and ensuring the effective adsorption length for the product, thus significantly improving the adsorption effect. During desorption and regeneration, the desorption effect of the adsorbent material is more uniform, further enhancing the desorption and regeneration efficiency. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the cylinder of the present invention; Figure 3 This is a schematic diagram of the internal structure of the ventilator of the present invention; Figure 4 This is a cross-sectional view of the vent cylinder and the material conveying shell of the present invention.

[0019] In the diagram: 1-Cylinder body; 2-Fixing plate; 3-Ventilator; 4-Support leg; 5-Lower exhaust pipe; 6-Lower air inlet pipe; 7-Lower gas distributor; 8-Lower support grid; 9-Upper support grid; 10-Upper gas distributor; 11-Upper air inlet pipe; 12-Upper exhaust pipe; 13-Upper ventilated baffle plate; 14-Protective shell; 15-Drive motor; 16-Feed pipe; 17-Lower ventilated baffle plate; 18-Auger; 19-Conveying shell; 20-Ventilation hole; 21-Discharge pipe. Detailed Implementation

[0020] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0021] like Figures 1 to 4 As shown, an adsorption dryer for isobutane dehydrogenation products includes a cylindrical body 1. Two fixed plates 2 are fixedly arranged on the inner wall of the cylindrical body 1. Several fixed ventilation cylinders 3 are arranged circumferentially between the two fixed plates 2. The top and bottom ends of the ventilation cylinders 3 pass through the two fixed plates 2 respectively. The upper inner wall and lower inner wall of the ventilation cylinders 3 are respectively provided with an upper ventilation baffle plate 13 and a lower ventilation baffle plate 17. Ventilation holes 20 are provided on both the upper ventilation baffle plate 13 and the lower ventilation baffle plate 17. The outer wall of the ventilation cylinders 3 is provided with a conveying shell 19 communicating with it. The adsorbent material circulates counterclockwise between the ventilation cylinders 3 and the conveying shell 19.

[0022] The upper and lower outer walls of the material conveying housing 19 are respectively provided with a discharge pipe 21 and a feed pipe 16. The discharge pipe 21 and the feed pipe 16 are located between the upper ventilated baffle plate 13 and the lower ventilated baffle plate 17 and are both connected to the ventilated cylinder 3.

[0023] The lower ventilation baffle plate 17 is set at an angle.

[0024] The top and bottom of the material conveying housing 19 are fixedly connected to two fixed plates 2 respectively, and the material conveying housing 19 is equipped with an auger 18 for rotation.

[0025] Several drive motors 15 are fixedly mounted on the bottom of one of the fixed plates 2, and the output shafts of the drive motors 15 are fixedly connected to the auger 18.

[0026] The drive motor 15 is fitted with a protective shell 14 on its outer wall.

[0027] The top and bottom of the cylinder 1 are respectively provided with an upper air inlet pipe 11 and a lower exhaust pipe 5, and the cylinder 1 is provided with an upper gas distributor 10 that is connected to the upper air inlet pipe 11.

[0028] The top and bottom of the cylinder 1 are respectively provided with an upper exhaust pipe 12 and a lower air inlet pipe 6, and the lower interior of the cylinder 1 is provided with a lower gas distributor 7 that is connected to the lower air inlet pipe 6.

[0029] Two upper support grids 9 are fixedly provided on the upper inner wall of the cylinder 1, and two lower support grids 8 are fixedly provided on the lower inner wall of the cylinder 1. Ceramic balls are filled between the two upper support grids 9 and the two lower support grids 8.

[0030] Several support legs 4 are fixedly provided at the bottom of the cylinder 1.

[0031] The working principle of this device is as follows: The isobutane dehydrogenation product enters the upper inlet pipe 11 and then the upper gas distributor 10 before entering the cylinder 1. The product then continues to flow downwards into the ventilation cylinder 3 and comes into contact with the adsorption material inside, thereby adsorbing water and hydrogen sulfide from the product. After adsorption, the product is discharged through the lower exhaust pipe 5. During this process, the upper exhaust pipe 12 and the lower inlet pipe 6 are closed. When the adsorption material reaches saturation and needs desorption and regeneration, the upper inlet pipe 11 and the lower exhaust pipe 5 are closed, while the upper exhaust pipe 12 and the lower inlet pipe 6 are opened. Hot dry gas enters the lower inlet pipe 6 and then the lower gas distributor 7 before entering the cylinder 1. The hot dry gas then continues to flow upwards into the ventilation cylinder 3 and comes into contact with the adsorption material inside, desorbing water and hydrogen sulfide. The gas continues to flow upwards and is discharged through the upper exhaust pipe 12. The ceramic balls between the upper support grid 9 and the lower support grid 8 can buffer the airflow impact and distribute the airflow evenly. During the adsorption and desorption processes, the auger 18 rotates to transport the adsorbent material, which circulates counterclockwise between the ventilation cylinder 3 and the material conveying shell 19. This ensures that the adsorbent material can come into uniform contact with the product or hot dry gas. During adsorption, the saturation rate of the adsorbent material increases at similar rates, resulting in a consistent saturation state and ensuring the effective adsorption length for the product, thus significantly improving the adsorption effect. During desorption and regeneration, the desorption effect of the adsorbent material is more uniform, further enhancing the desorption and regeneration efficiency.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. An adsorption dryer for isobutane dehydrogenation products, characterized in that: The device includes a cylinder (1), on which two fixed plates (2) are fixedly provided on the inner wall. Between the two fixed plates (2), several fixed ventilation cylinders (3) are provided along the circumference. The top and bottom ends of the ventilation cylinders (3) pass through the two fixed plates (2) respectively. The upper inner wall and lower inner wall of the ventilation cylinders (3) are respectively provided with an upper ventilation baffle plate (13) and a lower ventilation baffle plate (17). Ventilation holes (20) are provided on both the upper ventilation baffle plate (13) and the lower ventilation baffle plate (17). The outer wall of the ventilation cylinder (3) is provided with a material conveying shell (19) communicating with it. The adsorbent material circulates between the ventilation cylinder (3) and the material conveying shell (19) in a counterclockwise direction.

2. An adsorption dryer for isobutane dehydrogenation products according to claim 1, characterized in that: The upper outer wall and lower outer wall of the material conveying shell (19) are respectively provided with a discharge pipe (21) and a feed pipe (16). The discharge pipe (21) and the feed pipe (16) are located between the upper ventilated baffle plate (13) and the lower ventilated baffle plate (17) and are both connected to the ventilator (3).

3. An adsorption dryer for isobutane dehydrogenation products according to claim 2, characterized in that: The lower ventilation baffle plate (17) is set at an angle.

4. An adsorption dryer for isobutane dehydrogenation products according to claim 2, characterized in that: The top and bottom of the conveying housing (19) are fixedly connected to two fixing plates (2) respectively, and the conveying housing (19) is provided with an auger (18) for rotation.

5. An adsorption dryer for isobutane dehydrogenation products according to claim 4, characterized in that: One of the fixed plates (2) is fixedly provided with several drive motors (15) at the bottom, and the output shaft of the drive motor (15) is fixedly connected to the auger (18).

6. An adsorption dryer for isobutane dehydrogenation products according to claim 5, characterized in that: The drive motor (15) is fitted with a protective shell (14) on its outer wall.

7. An adsorption dryer for isobutane dehydrogenation products according to claim 1, characterized in that: The top and bottom of the cylinder (1) are respectively provided with an upper air inlet pipe (11) and a lower exhaust pipe (5), and the cylinder (1) is provided with an upper gas distributor (10) that communicates with the upper air inlet pipe (11).

8. An adsorption dryer for isobutane dehydrogenation products according to claim 1, characterized in that: The top and bottom of the cylinder (1) are respectively provided with an upper exhaust pipe (12) and a lower air inlet pipe (6), and the lower interior of the cylinder (1) is provided with a lower gas distributor (7) that communicates with the lower air inlet pipe (6).

9. An adsorption dryer for isobutane dehydrogenation products according to claim 1, characterized in that: Two upper support grids (9) are fixedly provided on the upper inner wall of the cylinder (1), and two lower support grids (8) are fixedly provided on the lower inner wall of the cylinder (1). Ceramic balls are filled between the two upper support grids (9) and the two lower support grids (8).

10. An adsorption dryer for isobutane dehydrogenation products according to claim 1, characterized in that: The bottom of the cylinder (1) is fixed with several legs (4).

Images